deleted file mode 100644
--- a/lib/rx.c
+++ /dev/null
@@ -1,7185 +0,0 @@
-/*	Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
-
-This file is part of the librx library.
-
-Librx is free software; you can redistribute it and/or modify it under
-the terms of the GNU Library General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-Librx is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with this software; see the file COPYING.LIB.  If not,
-write to the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
-
-/* NOTE!!!  AIX is so losing it requires this to be the first thing in the
- * file.
- * Do not put ANYTHING before it!
- */
-#if !defined (__GNUC__) && defined (_AIX)
- #pragma alloca
-#endif
-
-/* To make linux happy? */
-#ifndef	_GNU_SOURCE
-#define	_GNU_SOURCE
-#endif
-
-#if HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-const char *rx_version_string = "GNU Rx version 0.07.2";
-
-			/* ``Too hard!''
-			 *	    -- anon.
-			 */
-
-
-#include <stdio.h>
-#include <ctype.h>
-#ifndef isgraph
-#define isgraph(c) (isprint (c) && !isspace (c))
-#endif
-#ifndef isblank
-#define isblank(c) ((c) == ' ' || (c) == '\t')
-#endif
-
-#include <sys/types.h>
-
-#undef MAX
-#undef MIN
-#define MAX(a, b) ((a) > (b) ? (a) : (b))
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-
-typedef char boolean;
-#define false 0
-#define true 1
-
-#ifndef __GCC__
-#undef __inline__
-#define __inline__
-#endif
-
-/* Emacs already defines alloca, sometimes.  */
-#ifndef alloca
-
-/* Make alloca work the best possible way.  */
-#ifdef __GNUC__
-#define alloca __builtin_alloca
-#else /* not __GNUC__ */
-#if HAVE_ALLOCA_H
-#include <alloca.h>
-#else /* not __GNUC__ or HAVE_ALLOCA_H */
-#ifndef _AIX /* Already did AIX, up at the top.  */
-char *alloca ();
-#endif /* not _AIX */
-#endif /* not HAVE_ALLOCA_H */
-#endif /* not __GNUC__ */
-
-#endif /* not alloca */
-
-/* Memory management and stuff for emacs. */
-
-#define CHARBITS 8
-#define remalloc(M, S) (M ? realloc (M, S) : malloc (S))
-
-
-/* Should we use malloc or alloca?  If REGEX_MALLOC is not defined, we
- * use `alloca' instead of `malloc' for the backtracking stack.
- *
- * Emacs will die miserably if we don't do this.
- */
-
-#ifdef REGEX_MALLOC
-#define REGEX_ALLOCATE malloc
-#else /* not REGEX_MALLOC  */
-#define REGEX_ALLOCATE alloca
-#endif /* not REGEX_MALLOC */
-
-
-#ifdef RX_WANT_RX_DEFS
-#define RX_DECL extern
-#define RX_DEF_QUAL
-#else
-#define RX_WANT_RX_DEFS
-#define RX_DECL static
-#define RX_DEF_QUAL static
-#endif
-#include "rx.h"
-#undef RX_DECL
-#define RX_DECL RX_DEF_QUAL
-
-
-#ifndef emacs
-
-#ifndef SYNTAX
-
-RX_DECL char re_syntax_table[CHAR_SET_SIZE];
-
-#ifdef __STDC__
-static void
-init_syntax_once (void)
-#else
-static void
-init_syntax_once ()
-#endif
-{
-   register int c;
-   static int done = 0;
-
-   if (done)
-     return;
-
-   bzero (re_syntax_table, sizeof re_syntax_table);
-
-   for (c = 'a'; c <= 'z'; c++)
-     re_syntax_table[c] = Sword;
-
-   for (c = 'A'; c <= 'Z'; c++)
-     re_syntax_table[c] = Sword;
-
-   for (c = '0'; c <= '9'; c++)
-     re_syntax_table[c] = Sword;
-
-   re_syntax_table['_'] = Sword;
-
-   done = 1;
-}
-#endif /* not SYNTAX */
-#endif /* not emacs */
-
-/* Compile with `-DRX_DEBUG' and use the following flags.
- *
- * Debugging flags:
- *   	rx_debug - print information as a regexp is compiled
- * 	rx_debug_trace - print information as a regexp is executed
- */
-
-#ifdef RX_DEBUG
-
-int rx_debug_compile = 0;
-int rx_debug_trace = 0;
-static struct re_pattern_buffer * dbug_rxb = 0;
-
-#ifdef __STDC__
-typedef void (*side_effect_printer) (struct rx *, void *, FILE *);
-#else
-typedef void (*side_effect_printer) ();
-#endif
-
-#ifdef __STDC__
-static void print_cset (struct rx *rx, rx_Bitset cset, FILE * fp);
-#else
-static void print_cset ();
-#endif
-
-#ifdef __STDC__
-static void
-print_rexp (struct rx *rx,
-	    struct rexp_node *node, int depth,
-	    side_effect_printer seprint, FILE * fp)
-#else
-static void
-print_rexp (rx, node, depth, seprint, fp)
-     struct rx *rx;
-     struct rexp_node *node;
-     int depth;
-     side_effect_printer seprint;
-     FILE * fp;
-#endif
-{
-  if (!node)
-    return;
-  else
-    {
-      switch (node->type)
-	{
-	case r_cset:
-	  {
-	    fprintf (fp, "%*s", depth, "");
-	    print_cset (rx, node->params.cset, fp);
-	    fputc ('\n', fp);
-	    break;
-	  }
-
- 	case r_opt:
-	case r_star:
-	  fprintf (fp, "%*s%s\n", depth, "",
-		   node->type == r_opt ? "opt" : "star");
-	  print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp);
-	  break;
-
-	case r_2phase_star:
-	  fprintf (fp, "%*s2phase star\n", depth, "");
-	  print_rexp (rx, node->params.pair.right, depth + 3, seprint, fp);
-	  print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp);
-	  break;
-
-
-	case r_alternate:
-	case r_concat:
-	  fprintf (fp, "%*s%s\n", depth, "",
-		   node->type == r_alternate ? "alt" : "concat");
-	  print_rexp (rx, node->params.pair.left, depth + 3, seprint, fp);
-	  print_rexp (rx, node->params.pair.right, depth + 3, seprint, fp);
-	  break;
-	case r_side_effect:
-	  fprintf (fp, "%*sSide effect: ", depth, "");
-	  seprint (rx, node->params.side_effect, fp);
-	  fputc ('\n', fp);
-	}
-    }
-}
-
-#ifdef __STDC__
-static void
-print_nfa (struct rx * rx,
-	   struct rx_nfa_state * n,
-	   side_effect_printer seprint, FILE * fp)
-#else
-static void
-print_nfa (rx, n, seprint, fp)
-     struct rx * rx;
-     struct rx_nfa_state * n;
-     side_effect_printer seprint;
-     FILE * fp;
-#endif
-{
-  while (n)
-    {
-      struct rx_nfa_edge *e = n->edges;
-      struct rx_possible_future *ec = n->futures;
-      fprintf (fp, "node %d %s\n", n->id,
-	       n->is_final ? "final" : (n->is_start ? "start" : ""));
-      while (e)
-	{
-	  fprintf (fp, "   edge to %d, ", e->dest->id);
-	  switch (e->type)
-	    {
-	    case ne_epsilon:
-	      fprintf (fp, "epsilon\n");
-	      break;
-	    case ne_side_effect:
-	      fprintf (fp, "side effect ");
-	      seprint (rx, e->params.side_effect, fp);
-	      fputc ('\n', fp);
-	      break;
-	    case ne_cset:
-	      fprintf (fp, "cset ");
-	      print_cset (rx, e->params.cset, fp);
-	      fputc ('\n', fp);
-	      break;
-	    }
-	  e = e->next;
-	}
-
-      while (ec)
-	{
-	  int x;
-	  struct rx_nfa_state_set * s;
-	  struct rx_se_list * l;
-	  fprintf (fp, "   eclosure to {");
-	  for (s = ec->destset; s; s = s->cdr)
-	    fprintf (fp, "%d ", s->car->id);
-	  fprintf (fp, "} (");
-	  for (l = ec->effects; l; l = l->cdr)
-	    {
-	      seprint (rx, l->car, fp);
-	      fputc (' ', fp);
-	    }
-	  fprintf (fp, ")\n");
-	  ec = ec->next;
-	}
-      n = n->next;
-    }
-}
-
-static char * efnames [] =
-{
-  "bogon",
-  "re_se_try",
-  "re_se_pushback",
-  "re_se_push0",
-  "re_se_pushpos",
-  "re_se_chkpos",
-  "re_se_poppos",
-  "re_se_at_dot",
-  "re_se_syntax",
-  "re_se_not_syntax",
-  "re_se_begbuf",
-  "re_se_hat",
-  "re_se_wordbeg",
-  "re_se_wordbound",
-  "re_se_notwordbound",
-  "re_se_wordend",
-  "re_se_endbuf",
-  "re_se_dollar",
-  "re_se_fail",
-};
-
-static char * efnames2[] =
-{
-  "re_se_win",
-  "re_se_lparen",
-  "re_se_rparen",
-  "re_se_backref",
-  "re_se_iter",
-  "re_se_end_iter",
-  "re_se_tv"
-};
-
-static char * inx_names[] =
-{
-  "rx_backtrack_point",
-  "rx_do_side_effects",
-  "rx_cache_miss",
-  "rx_next_char",
-  "rx_backtrack",
-  "rx_error_inx",
-  "rx_num_instructions"
-};
-
-
-#ifdef __STDC__
-static void
-re_seprint (struct rx * rx, void * effect, FILE * fp)
-#else
-static void
-re_seprint (rx, effect, fp)
-     struct rx * rx;
-     void * effect;
-     FILE * fp;
-#endif
-{
-  if ((int)effect < 0)
-    fputs (efnames[-(int)effect], fp);
-  else if (dbug_rxb)
-    {
-      struct re_se_params * p = &dbug_rxb->se_params[(int)effect];
-      fprintf (fp, "%s(%d,%d)", efnames2[p->se], p->op1, p->op2);
-    }
-  else
-    fprintf (fp, "[complex op # %d]", (int)effect);
-}
-
-
-/* These are so the regex.c regression tests will compile. */
-void
-print_compiled_pattern (rxb)
-     struct re_pattern_buffer * rxb;
-{
-}
-
-void
-print_fastmap (fm)
-     char * fm;
-{
-}
-
-#endif /* RX_DEBUG */
-
-
-
-/* This page: Bitsets.  Completely unintersting. */
-
-#ifdef __STDC__
-RX_DECL int
-rx_bitset_is_equal (int size, rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL int
-rx_bitset_is_equal (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  RX_subset s = b[0];
-  b[0] = ~a[0];
-
-  for (x = rx_bitset_numb_subsets(size) - 1; a[x] == b[x]; --x)
-    ;
-
-  b[0] = s;
-  return !x && s == a[0];
-}
-
-#ifdef __STDC__
-RX_DECL int
-rx_bitset_is_subset (int size, rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL int
-rx_bitset_is_subset (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x = rx_bitset_numb_subsets(size) - 1;
-  while (x-- && (a[x] & b[x]) == a[x]);
-  return x == -1;
-}
-
-
-#ifdef __STDC__
-RX_DECL int
-rx_bitset_empty (int size, rx_Bitset set)
-#else
-RX_DECL int
-rx_bitset_empty (size, set)
-     int size;
-     rx_Bitset set;
-#endif
-{
-  int x;
-  RX_subset s = set[0];
-  set[0] = 1;
-  for (x = rx_bitset_numb_subsets(size) - 1; !set[x]; --x)
-    ;
-  set[0] = s;
-  return !s;
-}
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_null (int size, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_null (size, b)
-     int size;
-     rx_Bitset b;
-#endif
-{
-  bzero (b, rx_sizeof_bitset(size));
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_universe (int size, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_universe (size, b)
-     int size;
-     rx_Bitset b;
-#endif
-{
-  int x = rx_bitset_numb_subsets (size);
-  while (x--)
-    *b++ = ~(RX_subset)0;
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_complement (int size, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_complement (size, b)
-     int size;
-     rx_Bitset b;
-#endif
-{
-  int x = rx_bitset_numb_subsets (size);
-  while (x--)
-    {
-      *b = ~*b;
-      ++b;
-    }
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_assign (int size, rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_assign (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
-    a[x] = b[x];
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_union (int size, rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_union (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
-    a[x] |= b[x];
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_intersection (int size,
-			rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_intersection (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
-    a[x] &= b[x];
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_difference (int size, rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_difference (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
-    a[x] &=  ~ b[x];
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_revdifference (int size,
-			 rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_revdifference (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
-    a[x] = ~a[x] & b[x];
-}
-
-#ifdef __STDC__
-RX_DECL void
-rx_bitset_xor (int size, rx_Bitset a, rx_Bitset b)
-#else
-RX_DECL void
-rx_bitset_xor (size, a, b)
-     int size;
-     rx_Bitset a;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  for (x = rx_bitset_numb_subsets(size) - 1; x >=0; --x)
-    a[x] ^= b[x];
-}
-
-
-#ifdef __STDC__
-RX_DECL unsigned long
-rx_bitset_hash (int size, rx_Bitset b)
-#else
-RX_DECL unsigned long
-rx_bitset_hash (size, b)
-     int size;
-     rx_Bitset b;
-#endif
-{
-  int x;
-  unsigned long hash = (unsigned long)rx_bitset_hash;
-
-  for (x = rx_bitset_numb_subsets(size) - 1; x >= 0; --x)
-    hash ^= rx_bitset_subset_val(b, x);
-
-  return hash;
-}
-
-
-RX_DECL RX_subset rx_subset_singletons [RX_subset_bits] =
-{
-  0x1,
-  0x2,
-  0x4,
-  0x8,
-  0x10,
-  0x20,
-  0x40,
-  0x80,
-  0x100,
-  0x200,
-  0x400,
-  0x800,
-  0x1000,
-  0x2000,
-  0x4000,
-  0x8000,
-  0x10000,
-  0x20000,
-  0x40000,
-  0x80000,
-  0x100000,
-  0x200000,
-  0x400000,
-  0x800000,
-  0x1000000,
-  0x2000000,
-  0x4000000,
-  0x8000000,
-  0x10000000,
-  0x20000000,
-  0x40000000,
-  0x80000000
-};
-
-#ifdef RX_DEBUG
-
-#ifdef __STDC__
-static void
-print_cset (struct rx *rx, rx_Bitset cset, FILE * fp)
-#else
-static void
-print_cset (rx, cset, fp)
-     struct rx *rx;
-     rx_Bitset cset;
-     FILE * fp;
-#endif
-{
-  int x;
-  fputc ('[', fp);
-  for (x = 0; x < rx->local_cset_size; ++x)
-    if (RX_bitset_member (cset, x))
-      {
-	if (isprint(x))
-	  fputc (x, fp);
-	else
-	  fprintf (fp, "\\0%o ", x);
-      }
-  fputc (']', fp);
-}
-
-#endif /*  RX_DEBUG */
-
-
-
-static unsigned long rx_hash_masks[4] =
-{
-  0x12488421,
-  0x96699669,
-  0xbe7dd7eb,
-  0xffffffff
-};
-
-
-/* Hash tables */
-#ifdef __STDC__
-RX_DECL struct rx_hash_item *
-rx_hash_find (struct rx_hash * table,
-	      unsigned long hash,
-	      void * value,
-	      struct rx_hash_rules * rules)
-#else
-RX_DECL struct rx_hash_item *
-rx_hash_find (table, hash, value, rules)
-     struct rx_hash * table;
-     unsigned long hash;
-     void * value;
-     struct rx_hash_rules * rules;
-#endif
-{
-  rx_hash_eq eq = rules->eq;
-  int maskc = 0;
-  long mask = rx_hash_masks [0];
-  int bucket = (hash & mask) % 13;
-
-  while (table->children [bucket])
-    {
-      table = table->children [bucket];
-      ++maskc;
-      mask = rx_hash_masks[maskc];
-      bucket = (hash & mask) % 13;
-    }
-
-  {
-    struct rx_hash_item * it = table->buckets[bucket];
-    while (it)
-      if (eq (it->data, value))
-	return it;
-      else
-	it = it->next_same_hash;
-  }
-
-  return 0;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rx_hash_item *
-rx_hash_store (struct rx_hash * table,
-	       unsigned long hash,
-	       void * value,
-	       struct rx_hash_rules * rules)
-#else
-RX_DECL struct rx_hash_item *
-rx_hash_store (table, hash, value, rules)
-     struct rx_hash * table;
-     unsigned long hash;
-     void * value;
-     struct rx_hash_rules * rules;
-#endif
-{
-  rx_hash_eq eq = rules->eq;
-  int maskc = 0;
-  long mask = rx_hash_masks[0];
-  int bucket = (hash & mask) % 13;
-  int depth = 0;
-
-  while (table->children [bucket])
-    {
-      table = table->children [bucket];
-      ++maskc;
-      mask = rx_hash_masks[maskc];
-      bucket = (hash & mask) % 13;
-      ++depth;
-    }
-
-  {
-    struct rx_hash_item * it = table->buckets[bucket];
-    while (it)
-      if (eq (it->data, value))
-	return it;
-      else
-	it = it->next_same_hash;
-  }
-
-  {
-    if (   (depth < 3)
-	&& (table->bucket_size [bucket] >= 4))
-      {
-	struct rx_hash * newtab = ((struct rx_hash *)
-				   rules->hash_alloc (rules));
-	if (!newtab)
-	  goto add_to_bucket;
-	bzero (newtab, sizeof (*newtab));
-	newtab->parent = table;
-	{
-	  struct rx_hash_item * them = table->buckets[bucket];
-	  unsigned long newmask = rx_hash_masks[maskc + 1];
-	  while (them)
-	    {
-	      struct rx_hash_item * save = them->next_same_hash;
-	      int new_buck = (them->hash & newmask) % 13;
-	      them->next_same_hash = newtab->buckets[new_buck];
-	      newtab->buckets[new_buck] = them;
-	      them->table = newtab;
-	      them = save;
-	      ++newtab->bucket_size[new_buck];
-	      ++newtab->refs;
-	    }
-	  table->refs = (table->refs - table->bucket_size[bucket] + 1);
-	  table->bucket_size[bucket] = 0;
-	  table->buckets[bucket] = 0;
-	  table->children[bucket] = newtab;
-	  table = newtab;
-	  bucket = (hash & newmask) % 13;
-	}
-      }
-  }
- add_to_bucket:
-  {
-    struct rx_hash_item  * it = ((struct rx_hash_item *)
-				 rules->hash_item_alloc (rules, value));
-    if (!it)
-      return 0;
-    it->hash = hash;
-    it->table = table;
-    /* DATA and BINDING are to be set in hash_item_alloc */
-    it->next_same_hash = table->buckets [bucket];
-    table->buckets[bucket] = it;
-    ++table->bucket_size [bucket];
-    ++table->refs;
-    return it;
-  }
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_hash_free (struct rx_hash_item * it, struct rx_hash_rules * rules)
-#else
-RX_DECL void
-rx_hash_free (it, rules)
-     struct rx_hash_item * it;
-     struct rx_hash_rules * rules;
-#endif
-{
-  if (it)
-    {
-      struct rx_hash * table = it->table;
-      unsigned long hash = it->hash;
-      int depth = (table->parent
-		   ? (table->parent->parent
-		      ? (table->parent->parent->parent
-			 ? 3
-			 : 2)
-		      : 1)
-		   : 0);
-      int bucket = (hash & rx_hash_masks [depth]) % 13;
-      struct rx_hash_item ** pos = &table->buckets [bucket];
-
-      while (*pos != it)
-	pos = &(*pos)->next_same_hash;
-      *pos = it->next_same_hash;
-      rules->free_hash_item (it, rules);
-      --table->bucket_size[bucket];
-      --table->refs;
-      while (!table->refs && depth)
-	{
-	  struct rx_hash * save = table;
-	  table = table->parent;
-	  --depth;
-	  bucket = (hash & rx_hash_masks [depth]) % 13;
-	  --table->refs;
-	  table->children[bucket] = 0;
-	  rules->free_hash (save, rules);
-	}
-    }
-}
-
-#ifdef __STDC__
-RX_DECL void
-rx_free_hash_table (struct rx_hash * tab, rx_hash_freefn freefn,
-		    struct rx_hash_rules * rules)
-#else
-RX_DECL void
-rx_free_hash_table (tab, freefn, rules)
-     struct rx_hash * tab;
-     rx_hash_freefn freefn;
-     struct rx_hash_rules * rules;
-#endif
-{
-  int x;
-
-  for (x = 0; x < 13; ++x)
-    if (tab->children[x])
-      {
-	rx_free_hash_table (tab->children[x], freefn, rules);
-	rules->free_hash (tab->children[x], rules);
-      }
-    else
-      {
-	struct rx_hash_item * them = tab->buckets[x];
-	while (them)
-	  {
-	    struct rx_hash_item * that = them;
-	    them = that->next_same_hash;
-	    freefn (that);
-	    rules->free_hash_item (that, rules);
-	  }
-      }
-}
-
-
-
-/* Utilities for manipulating bitset represntations of characters sets. */
-
-#ifdef __STDC__
-RX_DECL rx_Bitset
-rx_cset (struct rx *rx)
-#else
-RX_DECL rx_Bitset
-rx_cset (rx)
-     struct rx *rx;
-#endif
-{
-  rx_Bitset b = (rx_Bitset) malloc (rx_sizeof_bitset (rx->local_cset_size));
-  if (b)
-    rx_bitset_null (rx->local_cset_size, b);
-  return b;
-}
-
-
-#ifdef __STDC__
-RX_DECL rx_Bitset
-rx_copy_cset (struct rx *rx, rx_Bitset a)
-#else
-RX_DECL rx_Bitset
-rx_copy_cset (rx, a)
-     struct rx *rx;
-     rx_Bitset a;
-#endif
-{
-  rx_Bitset cs = rx_cset (rx);
-
-  if (cs)
-    rx_bitset_union (rx->local_cset_size, cs, a);
-
-  return cs;
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_free_cset (struct rx * rx, rx_Bitset c)
-#else
-RX_DECL void
-rx_free_cset (rx, c)
-     struct rx * rx;
-     rx_Bitset c;
-#endif
-{
-  if (c)
-    free ((char *)c);
-}
-
-
-/* Hash table memory allocation policy for the regexp compiler */
-
-#ifdef __STDC__
-static struct rx_hash *
-compiler_hash_alloc (struct rx_hash_rules * rules)
-#else
-static struct rx_hash *
-compiler_hash_alloc (rules)
-     struct rx_hash_rules * rules;
-#endif
-{
-  return (struct rx_hash *)malloc (sizeof (struct rx_hash));
-}
-
-
-#ifdef __STDC__
-static struct rx_hash_item *
-compiler_hash_item_alloc (struct rx_hash_rules * rules, void * value)
-#else
-static struct rx_hash_item *
-compiler_hash_item_alloc (rules, value)
-     struct rx_hash_rules * rules;
-     void * value;
-#endif
-{
-  struct rx_hash_item * it;
-  it = (struct rx_hash_item *)malloc (sizeof (*it));
-  if (it)
-    {
-      it->data = value;
-      it->binding = 0;
-    }
-  return it;
-}
-
-
-#ifdef __STDC__
-static void
-compiler_free_hash (struct rx_hash * tab,
-		    struct rx_hash_rules * rules)
-#else
-static void
-compiler_free_hash (tab, rules)
-     struct rx_hash * tab;
-     struct rx_hash_rules * rules;
-#endif
-{
-  free ((char *)tab);
-}
-
-
-#ifdef __STDC__
-static void
-compiler_free_hash_item (struct rx_hash_item * item,
-			 struct rx_hash_rules * rules)
-#else
-static void
-compiler_free_hash_item (item, rules)
-     struct rx_hash_item * item;
-     struct rx_hash_rules * rules;
-#endif
-{
-  free ((char *)item);
-}
-
-
-/* This page: REXP_NODE (expression tree) structures. */
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rexp_node (struct rx *rx,
-	   enum rexp_node_type type)
-#else
-RX_DECL struct rexp_node *
-rexp_node (rx, type)
-     struct rx *rx;
-     enum rexp_node_type type;
-#endif
-{
-  struct rexp_node *n;
-
-  n = (struct rexp_node *)malloc (sizeof (*n));
-  bzero (n, sizeof (*n));
-  if (n)
-    n->type = type;
-  return n;
-}
-
-
-/* free_rexp_node assumes that the bitset passed to rx_mk_r_cset
- * can be freed using rx_free_cset.
- */
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_cset (struct rx * rx,
-	      rx_Bitset b)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_cset (rx, b)
-     struct rx * rx;
-     rx_Bitset b;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_cset);
-  if (n)
-    n->params.cset = b;
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_concat (struct rx * rx,
-		struct rexp_node * a,
-		struct rexp_node * b)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_concat (rx, a, b)
-     struct rx * rx;
-     struct rexp_node * a;
-     struct rexp_node * b;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_concat);
-  if (n)
-    {
-      n->params.pair.left = a;
-      n->params.pair.right = b;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_alternate (struct rx * rx,
-		   struct rexp_node * a,
-		   struct rexp_node * b)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_alternate (rx, a, b)
-     struct rx * rx;
-     struct rexp_node * a;
-     struct rexp_node * b;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_alternate);
-  if (n)
-    {
-      n->params.pair.left = a;
-      n->params.pair.right = b;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_opt (struct rx * rx,
-	     struct rexp_node * a)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_opt (rx, a)
-     struct rx * rx;
-     struct rexp_node * a;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_opt);
-  if (n)
-    {
-      n->params.pair.left = a;
-      n->params.pair.right = 0;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_star (struct rx * rx,
-	      struct rexp_node * a)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_star (rx, a)
-     struct rx * rx;
-     struct rexp_node * a;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_star);
-  if (n)
-    {
-      n->params.pair.left = a;
-      n->params.pair.right = 0;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_2phase_star (struct rx * rx,
-		     struct rexp_node * a,
-		     struct rexp_node * b)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_2phase_star (rx, a, b)
-     struct rx * rx;
-     struct rexp_node * a;
-     struct rexp_node * b;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_2phase_star);
-  if (n)
-    {
-      n->params.pair.left = a;
-      n->params.pair.right = b;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_side_effect (struct rx * rx,
-		     rx_side_effect a)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_side_effect (rx, a)
-     struct rx * rx;
-     rx_side_effect a;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_side_effect);
-  if (n)
-    {
-      n->params.side_effect = a;
-      n->params.pair.right = 0;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_mk_r_data  (struct rx * rx,
-	       void * a)
-#else
-RX_DECL struct rexp_node *
-rx_mk_r_data  (rx, a)
-     struct rx * rx;
-     void * a;
-#endif
-{
-  struct rexp_node * n = rexp_node (rx, r_data);
-  if (n)
-    {
-      n->params.pair.left = a;
-      n->params.pair.right = 0;
-    }
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_free_rexp (struct rx * rx, struct rexp_node * node)
-#else
-RX_DECL void
-rx_free_rexp (rx, node)
-     struct rx * rx;
-     struct rexp_node * node;
-#endif
-{
-  if (node)
-    {
-      switch (node->type)
-	{
-	case r_cset:
-	  if (node->params.cset)
-	    rx_free_cset (rx, node->params.cset);
-
-	case r_side_effect:
-	  break;
-
-	case r_concat:
-	case r_alternate:
-	case r_2phase_star:
-	case r_opt:
-	case r_star:
-	  rx_free_rexp (rx, node->params.pair.left);
-	  rx_free_rexp (rx, node->params.pair.right);
-	  break;
-
-	case r_data:
-	  /* This shouldn't occur. */
-	  break;
-	}
-      free ((char *)node);
-    }
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rexp_node *
-rx_copy_rexp (struct rx *rx,
-	   struct rexp_node *node)
-#else
-RX_DECL struct rexp_node *
-rx_copy_rexp (rx, node)
-     struct rx *rx;
-     struct rexp_node *node;
-#endif
-{
-  if (!node)
-    return 0;
-  else
-    {
-      struct rexp_node *n = rexp_node (rx, node->type);
-      if (!n)
-	return 0;
-      switch (node->type)
-	{
-	case r_cset:
-	  n->params.cset = rx_copy_cset (rx, node->params.cset);
-	  if (!n->params.cset)
-	    {
-	      rx_free_rexp (rx, n);
-	      return 0;
-	    }
-	  break;
-
-	case r_side_effect:
-	  n->params.side_effect = node->params.side_effect;
-	  break;
-
-	case r_concat:
-	case r_alternate:
-	case r_opt:
-	case r_2phase_star:
-	case r_star:
-	  n->params.pair.left =
-	    rx_copy_rexp (rx, node->params.pair.left);
-	  n->params.pair.right =
-	    rx_copy_rexp (rx, node->params.pair.right);
-	  if (   (node->params.pair.left && !n->params.pair.left)
-	      || (node->params.pair.right && !n->params.pair.right))
-	    {
-	      rx_free_rexp  (rx, n);
-	      return 0;
-	    }
-	  break;
-	case r_data:
-	  /* shouldn't happen */
-	  break;
-	}
-      return n;
-    }
-}
-
-
-
-/* This page: functions to build and destroy graphs that describe nfa's */
-
-/* Constructs a new nfa node. */
-#ifdef __STDC__
-RX_DECL struct rx_nfa_state *
-rx_nfa_state (struct rx *rx)
-#else
-RX_DECL struct rx_nfa_state *
-rx_nfa_state (rx)
-     struct rx *rx;
-#endif
-{
-  struct rx_nfa_state * n = (struct rx_nfa_state *)malloc (sizeof (*n));
-  if (!n)
-    return 0;
-  bzero (n, sizeof (*n));
-  n->next = rx->nfa_states;
-  rx->nfa_states = n;
-  return n;
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_free_nfa_state (struct rx_nfa_state * n)
-#else
-RX_DECL void
-rx_free_nfa_state (n)
-  struct rx_nfa_state * n;
-#endif
-{
-  free ((char *)n);
-}
-
-
-/* This looks up an nfa node, given a numeric id.  Numeric id's are
- * assigned after the nfa has been built.
- */
-#ifdef __STDC__
-RX_DECL struct rx_nfa_state *
-rx_id_to_nfa_state (struct rx * rx,
-		    int id)
-#else
-RX_DECL struct rx_nfa_state *
-rx_id_to_nfa_state (rx, id)
-     struct rx * rx;
-     int id;
-#endif
-{
-  struct rx_nfa_state * n;
-  for (n = rx->nfa_states; n; n = n->next)
-    if (n->id == id)
-      return n;
-  return 0;
-}
-
-
-/* This adds an edge between two nodes, but doesn't initialize the
- * edge label.
- */
-
-#ifdef __STDC__
-RX_DECL struct rx_nfa_edge *
-rx_nfa_edge (struct rx *rx,
-	     enum rx_nfa_etype type,
-	     struct rx_nfa_state *start,
-	     struct rx_nfa_state *dest)
-#else
-RX_DECL struct rx_nfa_edge *
-rx_nfa_edge (rx, type, start, dest)
-     struct rx *rx;
-     enum rx_nfa_etype type;
-     struct rx_nfa_state *start;
-     struct rx_nfa_state *dest;
-#endif
-{
-  struct rx_nfa_edge *e;
-  e = (struct rx_nfa_edge *)malloc (sizeof (*e));
-  if (!e)
-    return 0;
-  e->next = start->edges;
-  start->edges = e;
-  e->type = type;
-  e->dest = dest;
-  return e;
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_free_nfa_edge (struct rx_nfa_edge * e)
-#else
-RX_DECL void
-rx_free_nfa_edge (e)
-     struct rx_nfa_edge * e;
-#endif
-{
-  free ((char *)e);
-}
-
-
-/* This constructs a POSSIBLE_FUTURE, which is a kind epsilon-closure
- * of an NFA.  These are added to an nfa automaticly by eclose_nfa.
- */
-
-#ifdef __STDC__
-static struct rx_possible_future *
-rx_possible_future (struct rx * rx,
-		 struct rx_se_list * effects)
-#else
-static struct rx_possible_future *
-rx_possible_future (rx, effects)
-     struct rx * rx;
-     struct rx_se_list * effects;
-#endif
-{
-  struct rx_possible_future *ec;
-  ec = (struct rx_possible_future *) malloc (sizeof (*ec));
-  if (!ec)
-    return 0;
-  ec->destset = 0;
-  ec->next = 0;
-  ec->effects = effects;
-  return ec;
-}
-
-
-#ifdef __STDC__
-static void
-rx_free_possible_future (struct rx_possible_future * pf)
-#else
-static void
-rx_free_possible_future (pf)
-     struct rx_possible_future * pf;
-#endif
-{
-  free ((char *)pf);
-}
-
-
-#ifdef __STDC__
-RX_DECL void
-rx_free_nfa (struct rx *rx)
-#else
-RX_DECL void
-rx_free_nfa (rx)
-     struct rx *rx;
-#endif
-{
-  while (rx->nfa_states)
-    {
-      while (rx->nfa_states->edges)
-	{
-	  switch (rx->nfa_states->edges->type)
-	    {
-	    case ne_cset:
-	      rx_free_cset (rx, rx->nfa_states->edges->params.cset);
-	      break;
-	    default:
-	      break;
-	    }
-	  {
-	    struct rx_nfa_edge * e;
-	    e = rx->nfa_states->edges;
-	    rx->nfa_states->edges = rx->nfa_states->edges->next;
-	    rx_free_nfa_edge (e);
-	  }
-	} /* while (rx->nfa_states->edges) */
-      {
-	/* Iterate over the partial epsilon closures of rx->nfa_states */
-	struct rx_possible_future * pf = rx->nfa_states->futures;
-	while (pf)
-	  {
-	    struct rx_possible_future * pft = pf;
-	    pf = pf->next;
-	    rx_free_possible_future (pft);
-	  }
-      }
-      {
-	struct rx_nfa_state *n;
-	n = rx->nfa_states;
-	rx->nfa_states = rx->nfa_states->next;
-	rx_free_nfa_state (n);
-      }
-    }
-}
-
-
-
-/* This page: translating a pattern expression into an nfa and doing the
- * static part of the nfa->super-nfa translation.
- */
-
-/* This is the thompson regexp->nfa algorithm.
- * It is modified to allow for `side-effect epsilons.'  Those are
- * edges that are taken whenever a similar epsilon edge would be,
- * but which imply that some side effect occurs when the edge
- * is taken.
- *
- * Side effects are used to model parts of the pattern langauge
- * that are not regular (in the formal sense).
- */
-
-#ifdef __STDC__
-RX_DECL int
-rx_build_nfa (struct rx *rx,
-	      struct rexp_node *rexp,
-	      struct rx_nfa_state **start,
-	      struct rx_nfa_state **end)
-#else
-RX_DECL int
-rx_build_nfa (rx, rexp, start, end)
-     struct rx *rx;
-     struct rexp_node *rexp;
-     struct rx_nfa_state **start;
-     struct rx_nfa_state **end;
-#endif
-{
-  struct rx_nfa_edge *edge;
-
-  /* Start & end nodes may have been allocated by the caller. */
-  *start = *start ? *start : rx_nfa_state (rx);
-
-  if (!*start)
-    return 0;
-
-  if (!rexp)
-    {
-      *end = *start;
-      return 1;
-    }
-
-  *end = *end ? *end : rx_nfa_state (rx);
-
-  if (!*end)
-    {
-      rx_free_nfa_state (*start);
-      return 0;
-    }
-
-  switch (rexp->type)
-    {
-    case r_data:
-      return 0;
-
-    case r_cset:
-      edge = rx_nfa_edge (rx, ne_cset, *start, *end);
-      if (!edge)
-	return 0;
-      edge->params.cset = rx_copy_cset (rx, rexp->params.cset);
-      if (!edge->params.cset)
-	{
-	  rx_free_nfa_edge (edge);
-	  return 0;
-	}
-      return 1;
-
-    case r_opt:
-      return (rx_build_nfa (rx, rexp->params.pair.left, start, end)
-	      && rx_nfa_edge (rx, ne_epsilon, *start, *end));
-
-    case r_star:
-      {
-	struct rx_nfa_state * star_start = 0;
-	struct rx_nfa_state * star_end = 0;
-	return (rx_build_nfa (rx, rexp->params.pair.left,
-			      &star_start, &star_end)
-		&& star_start
-		&& star_end
-		&& rx_nfa_edge (rx, ne_epsilon, star_start, star_end)
-		&& rx_nfa_edge (rx, ne_epsilon, *start, star_start)
-		&& rx_nfa_edge (rx, ne_epsilon, star_end, *end)
-
-		&& rx_nfa_edge (rx, ne_epsilon, star_end, star_start));
-      }
-
-    case r_2phase_star:
-      {
-	struct rx_nfa_state * star_start = 0;
-	struct rx_nfa_state * star_end = 0;
-	struct rx_nfa_state * loop_exp_start = 0;
-	struct rx_nfa_state * loop_exp_end = 0;
-
-	return (rx_build_nfa (rx, rexp->params.pair.left,
-			      &star_start, &star_end)
-		&& rx_build_nfa (rx, rexp->params.pair.right,
-				 &loop_exp_start, &loop_exp_end)
-		&& star_start
-		&& star_end
-		&& loop_exp_end
-		&& loop_exp_start
-		&& rx_nfa_edge (rx, ne_epsilon, star_start, *end)
-		&& rx_nfa_edge (rx, ne_epsilon, *start, star_start)
-		&& rx_nfa_edge (rx, ne_epsilon, star_end, *end)
-
-		&& rx_nfa_edge (rx, ne_epsilon, star_end, loop_exp_start)
-		&& rx_nfa_edge (rx, ne_epsilon, loop_exp_end, star_start));
-      }
-
-
-    case r_concat:
-      {
-	struct rx_nfa_state *shared = 0;
-	return
-	  (rx_build_nfa (rx, rexp->params.pair.left, start, &shared)
-	   && rx_build_nfa (rx, rexp->params.pair.right, &shared, end));
-      }
-
-    case r_alternate:
-      {
-	struct rx_nfa_state *ls = 0;
-	struct rx_nfa_state *le = 0;
-	struct rx_nfa_state *rs = 0;
-	struct rx_nfa_state *re = 0;
-	return (rx_build_nfa (rx, rexp->params.pair.left, &ls, &le)
-		&& rx_build_nfa (rx, rexp->params.pair.right, &rs, &re)
-		&& rx_nfa_edge (rx, ne_epsilon, *start, ls)
-		&& rx_nfa_edge (rx, ne_epsilon, *start, rs)
-		&& rx_nfa_edge (rx, ne_epsilon, le, *end)
-		&& rx_nfa_edge (rx, ne_epsilon, re, *end));
-      }
-
-    case r_side_effect:
-      edge = rx_nfa_edge (rx, ne_side_effect, *start, *end);
-      if (!edge)
-	return 0;
-      edge->params.side_effect = rexp->params.side_effect;
-      return 1;
-    }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-/* RX_NAME_NFA_STATES identifies all nodes with outgoing non-epsilon
- * transitions.  Only these nodes can occur in super-states.
- * All nodes are given an integer id.
- * The id is non-negative if the node has non-epsilon out-transitions, negative
- * otherwise (this is because we want the non-negative ids to be used as
- * array indexes in a few places).
- */
-
-#ifdef __STDC__
-RX_DECL void
-rx_name_nfa_states (struct rx *rx)
-#else
-RX_DECL void
-rx_name_nfa_states (rx)
-     struct rx *rx;
-#endif
-{
-  struct rx_nfa_state *n = rx->nfa_states;
-
-  rx->nodec = 0;
-  rx->epsnodec = -1;
-
-  while (n)
-    {
-      struct rx_nfa_edge *e = n->edges;
-
-      if (n->is_start)
-	n->eclosure_needed = 1;
-
-      while (e)
-	{
-	  switch (e->type)
-	    {
-	    case ne_epsilon:
-	    case ne_side_effect:
-	      break;
-
-	    case ne_cset:
-	      n->id = rx->nodec++;
-	      {
-		struct rx_nfa_edge *from_n = n->edges;
-		while (from_n)
-		  {
-		    from_n->dest->eclosure_needed = 1;
-		    from_n = from_n->next;
-		  }
-	      }
-	      goto cont;
-	    }
-	  e = e->next;
-	}
-      n->id = rx->epsnodec--;
-    cont:
-      n = n->next;
-    }
-  rx->epsnodec = -rx->epsnodec;
-}
-
-
-/* This page: data structures for the static part of the nfa->supernfa
- * translation.
- *
- * There are side effect lists -- lists of side effects occuring
- * along an uninterrupted, acyclic path of side-effect epsilon edges.
- * Such paths are collapsed to single edges in the course of computing
- * epsilon closures.  Such single edges are labled with a list of all
- * the side effects entailed in crossing them.  Like lists of side
- * effects are made == by the constructors below.
- *
- * There are also nfa state sets.  These are used to hold a list of all
- * states reachable from a starting state for a given type of transition
- * and side effect list.   These are also hash-consed.
- */
-
-/* The next several functions compare, construct, etc. lists of side
- * effects.  See ECLOSE_NFA (below) for details.
- */
-
-/* Ordering of rx_se_list
- * (-1, 0, 1 return value convention).
- */
-
-#ifdef __STDC__
-static int
-se_list_cmp (void * va, void * vb)
-#else
-static int
-se_list_cmp (va, vb)
-     void * va;
-     void * vb;
-#endif
-{
-  struct rx_se_list * a = (struct rx_se_list *)va;
-  struct rx_se_list * b = (struct rx_se_list *)vb;
-
-  return ((va == vb)
-	  ? 0
-	  : (!va
-	     ? -1
-	     : (!vb
-		? 1
-		: ((long)a->car < (long)b->car
-		   ? 1
-		   : ((long)a->car > (long)b->car
-		      ? -1
-		      : se_list_cmp ((void *)a->cdr, (void *)b->cdr))))));
-}
-
-
-#ifdef __STDC__
-static int
-se_list_equal (void * va, void * vb)
-#else
-static int
-se_list_equal (va, vb)
-     void * va;
-     void * vb;
-#endif
-{
-  return !(se_list_cmp (va, vb));
-}
-
-static struct rx_hash_rules se_list_hash_rules =
-{
-  se_list_equal,
-  compiler_hash_alloc,
-  compiler_free_hash,
-  compiler_hash_item_alloc,
-  compiler_free_hash_item
-};
-
-
-#ifdef __STDC__
-static struct rx_se_list *
-side_effect_cons (struct rx * rx,
-		  void * se, struct rx_se_list * list)
-#else
-static struct rx_se_list *
-side_effect_cons (rx, se, list)
-     struct rx * rx;
-     void * se;
-     struct rx_se_list * list;
-#endif
-{
-  struct rx_se_list * l;
-  l = ((struct rx_se_list *) malloc (sizeof (*l)));
-  if (!l)
-    return 0;
-  l->car = se;
-  l->cdr = list;
-  return l;
-}
-
-
-#ifdef __STDC__
-static struct rx_se_list *
-hash_cons_se_prog (struct rx * rx,
-		   struct rx_hash * memo,
-		   void * car, struct rx_se_list * cdr)
-#else
-static struct rx_se_list *
-hash_cons_se_prog (rx, memo, car, cdr)
-     struct rx * rx;
-     struct rx_hash * memo;
-     void * car;
-     struct rx_se_list * cdr;
-#endif
-{
-  long hash = (long)car ^ (long)cdr;
-  struct rx_se_list template;
-
-  template.car = car;
-  template.cdr = cdr;
-  {
-    struct rx_hash_item * it = rx_hash_store (memo, hash,
-					      (void *)&template,
-					      &se_list_hash_rules);
-    if (!it)
-      return 0;
-    if (it->data == (void *)&template)
-      {
-	struct rx_se_list * consed;
-	consed = (struct rx_se_list *) malloc (sizeof (*consed));
-	*consed = template;
-	it->data = (void *)consed;
-      }
-    return (struct rx_se_list *)it->data;
-  }
-}
-
-
-#ifdef __STDC__
-static struct rx_se_list *
-hash_se_prog (struct rx * rx, struct rx_hash * memo, struct rx_se_list * prog)
-#else
-static struct rx_se_list *
-hash_se_prog (rx, memo, prog)
-     struct rx * rx;
-     struct rx_hash * memo;
-     struct rx_se_list * prog;
-#endif
-{
-  struct rx_se_list * answer = 0;
-  while (prog)
-    {
-      answer = hash_cons_se_prog (rx, memo, prog->car, answer);
-      if (!answer)
-	return 0;
-      prog = prog->cdr;
-    }
-  return answer;
-}
-
-#ifdef __STDC__
-static int
-nfa_set_cmp (void * va, void * vb)
-#else
-static int
-nfa_set_cmp (va, vb)
-     void * va;
-     void * vb;
-#endif
-{
-  struct rx_nfa_state_set * a = (struct rx_nfa_state_set *)va;
-  struct rx_nfa_state_set * b = (struct rx_nfa_state_set *)vb;
-
-  return ((va == vb)
-	  ? 0
-	  : (!va
-	     ? -1
-	     : (!vb
-		? 1
-		: (a->car->id < b->car->id
-		   ? 1
-		   : (a->car->id > b->car->id
-		      ? -1
-		      : nfa_set_cmp ((void *)a->cdr, (void *)b->cdr))))));
-}
-
-#ifdef __STDC__
-static int
-nfa_set_equal (void * va, void * vb)
-#else
-static int
-nfa_set_equal (va, vb)
-     void * va;
-     void * vb;
-#endif
-{
-  return !nfa_set_cmp (va, vb);
-}
-
-static struct rx_hash_rules nfa_set_hash_rules =
-{
-  nfa_set_equal,
-  compiler_hash_alloc,
-  compiler_free_hash,
-  compiler_hash_item_alloc,
-  compiler_free_hash_item
-};
-
-
-#ifdef __STDC__
-static struct rx_nfa_state_set *
-nfa_set_cons (struct rx * rx,
-	      struct rx_hash * memo, struct rx_nfa_state * state,
-	      struct rx_nfa_state_set * set)
-#else
-static struct rx_nfa_state_set *
-nfa_set_cons (rx, memo, state, set)
-     struct rx * rx;
-     struct rx_hash * memo;
-     struct rx_nfa_state * state;
-     struct rx_nfa_state_set * set;
-#endif
-{
-  struct rx_nfa_state_set template;
-  struct rx_hash_item * node;
-  template.car = state;
-  template.cdr = set;
-  node = rx_hash_store (memo,
-			(((long)state) >> 8) ^ (long)set,
-			&template, &nfa_set_hash_rules);
-  if (!node)
-    return 0;
-  if (node->data == &template)
-    {
-      struct rx_nfa_state_set * l;
-      l = (struct rx_nfa_state_set *) malloc (sizeof (*l));
-      node->data = (void *) l;
-      if (!l)
-	return 0;
-      *l = template;
-    }
-  return (struct rx_nfa_state_set *)node->data;
-}
-
-
-#ifdef __STDC__
-static struct rx_nfa_state_set *
-nfa_set_enjoin (struct rx * rx,
-		struct rx_hash * memo, struct rx_nfa_state * state,
-		struct rx_nfa_state_set * set)
-#else
-static struct rx_nfa_state_set *
-nfa_set_enjoin (rx, memo, state, set)
-     struct rx * rx;
-     struct rx_hash * memo;
-     struct rx_nfa_state * state;
-     struct rx_nfa_state_set * set;
-#endif
-{
-  if (!set || state->id < set->car->id)
-    return nfa_set_cons (rx, memo, state, set);
-  if (state->id == set->car->id)
-    return set;
-  else
-    {
-      struct rx_nfa_state_set * newcdr
-	= nfa_set_enjoin (rx, memo, state, set->cdr);
-      if (newcdr != set->cdr)
-	set = nfa_set_cons (rx, memo, set->car, newcdr);
-      return set;
-    }
-}
-
-
-
-/* This page: computing epsilon closures.  The closures aren't total.
- * Each node's closures are partitioned according to the side effects entailed
- * along the epsilon edges.  Return true on success.
- */
-
-struct eclose_frame
-{
-  struct rx_se_list *prog_backwards;
-};
-
-
-#ifdef __STDC__
-static int
-eclose_node (struct rx *rx, struct rx_nfa_state *outnode,
-	     struct rx_nfa_state *node, struct eclose_frame *frame)
-#else
-static int
-eclose_node (rx, outnode, node, frame)
-     struct rx *rx;
-     struct rx_nfa_state *outnode;
-     struct rx_nfa_state *node;
-     struct eclose_frame *frame;
-#endif
-{
-  struct rx_nfa_edge *e = node->edges;
-
-  /* For each node, we follow all epsilon paths to build the closure.
-   * The closure omits nodes that have only epsilon edges.
-   * The closure is split into partial closures -- all the states in
-   * a partial closure are reached by crossing the same list of
-   * of side effects (though not necessarily the same path).
-   */
-  if (node->mark)
-    return 1;
-  node->mark = 1;
-
-  if (node->id >= 0 || node->is_final)
-    {
-      struct rx_possible_future **ec;
-      struct rx_se_list * prog_in_order
-	= ((struct rx_se_list *)hash_se_prog (rx,
-					      &rx->se_list_memo,
-					      frame->prog_backwards));
-      int cmp;
-
-      ec = &outnode->futures;
-
-      while (*ec)
-	{
-	  cmp = se_list_cmp ((void *)(*ec)->effects, (void *)prog_in_order);
-	  if (cmp <= 0)
-	    break;
-	  ec = &(*ec)->next;
-	}
-      if (!*ec || (cmp < 0))
-	{
-	  struct rx_possible_future * saved = *ec;
-	  *ec = rx_possible_future (rx, prog_in_order);
-	  (*ec)->next = saved;
-	  if (!*ec)
-	    return 0;
-	}
-      if (node->id >= 0)
-	{
-	  (*ec)->destset = nfa_set_enjoin (rx, &rx->set_list_memo,
-					   node, (*ec)->destset);
-	  if (!(*ec)->destset)
-	    return 0;
-	}
-    }
-
-  while (e)
-    {
-      switch (e->type)
-	{
-	case ne_epsilon:
-	  if (!eclose_node (rx, outnode, e->dest, frame))
-	    return 0;
-	  break;
-	case ne_side_effect:
-	  {
-	    frame->prog_backwards = side_effect_cons (rx,
-						      e->params.side_effect,
-						      frame->prog_backwards);
-	    if (!frame->prog_backwards)
-	      return 0;
-	    if (!eclose_node (rx, outnode, e->dest, frame))
-	      return 0;
-	    {
-	      struct rx_se_list * dying = frame->prog_backwards;
-	      frame->prog_backwards = frame->prog_backwards->cdr;
-	      free ((char *)dying);
-	    }
-	    break;
-	  }
-	default:
-	  break;
-	}
-      e = e->next;
-    }
-  node->mark = 0;
-  return 1;
-}
-
-
-#ifdef __STDC__
-RX_DECL int
-rx_eclose_nfa (struct rx *rx)
-#else
-RX_DECL int
-rx_eclose_nfa (rx)
-     struct rx *rx;
-#endif
-{
-  struct rx_nfa_state *n = rx->nfa_states;
-  struct eclose_frame frame;
-  static int rx_id = 0;
-
-  frame.prog_backwards = 0;
-  rx->rx_id = rx_id++;
-  bzero (&rx->se_list_memo, sizeof (rx->se_list_memo));
-  bzero (&rx->set_list_memo, sizeof (rx->set_list_memo));
-  while (n)
-    {
-      n->futures = 0;
-      if (n->eclosure_needed && !eclose_node (rx, n, n, &frame))
-	return 0;
-      /* clear_marks (rx); */
-      n = n->next;
-    }
-  return 1;
-}
-
-
-/* This deletes epsilon edges from an NFA.  After running eclose_node,
- * we have no more need for these edges.  They are removed to simplify
- * further operations on the NFA.
- */
-
-#ifdef __STDC__
-RX_DECL void
-rx_delete_epsilon_transitions (struct rx *rx)
-#else
-RX_DECL void
-rx_delete_epsilon_transitions (rx)
-     struct rx *rx;
-#endif
-{
-  struct rx_nfa_state *n = rx->nfa_states;
-  struct rx_nfa_edge **e;
-
-  while (n)
-    {
-      e = &n->edges;
-      while (*e)
-	{
-	  struct rx_nfa_edge *t;
-	  switch ((*e)->type)
-	    {
-	    case ne_epsilon:
-	    case ne_side_effect:
-	      t = *e;
-	      *e = t->next;
-	      rx_free_nfa_edge (t);
-	      break;
-
-	    default:
-	      e = &(*e)->next;
-	      break;
-	    }
-	}
-      n = n->next;
-    }
-}
-
-
-/* This page: storing the nfa in a contiguous region of memory for
- * subsequent conversion to a super-nfa.
- */
-
-/* This is for qsort on an array of nfa_states. The order
- * is based on state ids and goes
- *		[0...MAX][MIN..-1] where (MAX>=0) and (MIN<0)
- * This way, positive ids double as array indices.
- */
-
-#ifdef __STDC__
-static int
-nfacmp (void * va, void * vb)
-#else
-static int
-nfacmp (va, vb)
-     void * va;
-     void * vb;
-#endif
-{
-  struct rx_nfa_state **a = (struct rx_nfa_state **)va;
-  struct rx_nfa_state **b = (struct rx_nfa_state **)vb;
-  return (*a == *b		/* &&&& 3.18 */
-	  ? 0
-	  : (((*a)->id < 0) == ((*b)->id < 0)
-	     ? (((*a)->id  < (*b)->id) ? -1 : 1)
-	     : (((*a)->id < 0)
-		? 1 : -1)));
-}
-
-#ifdef __STDC__
-static int
-count_hash_nodes (struct rx_hash * st)
-#else
-static int
-count_hash_nodes (st)
-     struct rx_hash * st;
-#endif
-{
-  int x;
-  int count = 0;
-  for (x = 0; x < 13; ++x)
-    count += ((st->children[x])
-	      ? count_hash_nodes (st->children[x])
-	      : st->bucket_size[x]);
-
-  return count;
-}
-
-
-#ifdef __STDC__
-static void
-se_memo_freer (struct rx_hash_item * node)
-#else
-static void
-se_memo_freer (node)
-     struct rx_hash_item * node;
-#endif
-{
-  free ((char *)node->data);
-}
-
-
-#ifdef __STDC__
-static void
-nfa_set_freer (struct rx_hash_item * node)
-#else
-static void
-nfa_set_freer (node)
-     struct rx_hash_item * node;
-#endif
-{
-  free ((char *)node->data);
-}
-
-
-/* This copies an entire NFA into a single malloced block of memory.
- * Mostly this is for compatability with regex.c, though it is convenient
- * to have the nfa nodes in an array.
- */
-
-#ifdef __STDC__
-RX_DECL int
-rx_compactify_nfa (struct rx *rx,
-		   void **mem, unsigned long *size)
-#else
-RX_DECL int
-rx_compactify_nfa (rx, mem, size)
-     struct rx *rx;
-     void **mem;
-     unsigned long *size;
-#endif
-{
-  int total_nodec;
-  struct rx_nfa_state *n;
-  int edgec = 0;
-  int eclosec = 0;
-  int se_list_consc = count_hash_nodes (&rx->se_list_memo);
-  int nfa_setc = count_hash_nodes (&rx->set_list_memo);
-  unsigned long total_size;
-
-  /* This takes place in two stages.   First, the total size of the
-   * nfa is computed, then structures are copied.
-   */
-  n = rx->nfa_states;
-  total_nodec = 0;
-  while (n)
-    {
-      struct rx_nfa_edge *e = n->edges;
-      struct rx_possible_future *ec = n->futures;
-      ++total_nodec;
-      while (e)
-	{
-	  ++edgec;
-	  e = e->next;
-	}
-      while (ec)
-	{
-	  ++eclosec;
-	  ec = ec->next;
-	}
-      n = n->next;
-    }
-
-  total_size = (total_nodec * sizeof (struct rx_nfa_state)
-		+ edgec * rx_sizeof_bitset (rx->local_cset_size)
-		+ edgec * sizeof (struct rx_nfa_edge)
-		+ nfa_setc * sizeof (struct rx_nfa_state_set)
-		+ eclosec * sizeof (struct rx_possible_future)
-		+ se_list_consc * sizeof (struct rx_se_list)
-		+ rx->reserved);
-
-  if (total_size > *size)
-    {
-      *mem = remalloc (*mem, total_size);
-      if (*mem)
-	*size = total_size;
-      else
-	return 0;
-    }
-  /* Now we've allocated the memory; this copies the NFA. */
-  {
-    static struct rx_nfa_state **scratch = 0;
-    static int scratch_alloc = 0;
-    struct rx_nfa_state *state_base = (struct rx_nfa_state *) * mem;
-    struct rx_nfa_state *new_state = state_base;
-    struct rx_nfa_edge *new_edge =
-      (struct rx_nfa_edge *)
-	((char *) state_base + total_nodec * sizeof (struct rx_nfa_state));
-    struct rx_se_list * new_se_list =
-      (struct rx_se_list *)
-	((char *)new_edge + edgec * sizeof (struct rx_nfa_edge));
-    struct rx_possible_future *new_close =
-      ((struct rx_possible_future *)
-       ((char *) new_se_list
-	+ se_list_consc * sizeof (struct rx_se_list)));
-    struct rx_nfa_state_set * new_nfa_set =
-      ((struct rx_nfa_state_set *)
-       ((char *)new_close + eclosec * sizeof (struct rx_possible_future)));
-    char *new_bitset =
-      ((char *) new_nfa_set + nfa_setc * sizeof (struct rx_nfa_state_set));
-    int x;
-    struct rx_nfa_state *n;
-
-    if (scratch_alloc < total_nodec)
-      {
-	scratch = ((struct rx_nfa_state **)
-		   remalloc (scratch, total_nodec * sizeof (*scratch)));
-	if (scratch)
-	  scratch_alloc = total_nodec;
-	else
-	  {
-	    scratch_alloc = 0;
-	    return 0;
-	  }
-      }
-
-    for (x = 0, n = rx->nfa_states; n; n = n->next)
-      scratch[x++] = n;
-
-    qsort (scratch, total_nodec,
-	   sizeof (struct rx_nfa_state *), (int (*)())nfacmp);
-
-    for (x = 0; x < total_nodec; ++x)
-      {
-	struct rx_possible_future *eclose = scratch[x]->futures;
-	struct rx_nfa_edge *edge = scratch[x]->edges;
-	struct rx_nfa_state *cn = new_state++;
-	cn->futures = 0;
-	cn->edges = 0;
-	cn->next = (x == total_nodec - 1) ? 0 : (cn + 1);
-	cn->id = scratch[x]->id;
-	cn->is_final = scratch[x]->is_final;
-	cn->is_start = scratch[x]->is_start;
-	cn->mark = 0;
-	while (edge)
-	  {
-	    int indx = (edge->dest->id < 0
-			 ? (total_nodec + edge->dest->id)
-			 : edge->dest->id);
-	    struct rx_nfa_edge *e = new_edge++;
-	    rx_Bitset cset = (rx_Bitset) new_bitset;
-	    new_bitset += rx_sizeof_bitset (rx->local_cset_size);
-	    rx_bitset_null (rx->local_cset_size, cset);
-	    rx_bitset_union (rx->local_cset_size, cset, edge->params.cset);
-	    e->next = cn->edges;
-	    cn->edges = e;
-	    e->type = edge->type;
-	    e->dest = state_base + indx;
-	    e->params.cset = cset;
-	    edge = edge->next;
-	  }
-	while (eclose)
-	  {
-	    struct rx_possible_future *ec = new_close++;
-	    struct rx_hash_item * sp;
-	    struct rx_se_list ** sepos;
-	    struct rx_se_list * sesrc;
-	    struct rx_nfa_state_set * destlst;
-	    struct rx_nfa_state_set ** destpos;
-	    ec->next = cn->futures;
-	    cn->futures = ec;
-	    for (sepos = &ec->effects, sesrc = eclose->effects;
-		 sesrc;
-		 sesrc = sesrc->cdr, sepos = &(*sepos)->cdr)
-	      {
-		sp = rx_hash_find (&rx->se_list_memo,
-				   (long)sesrc->car ^ (long)sesrc->cdr,
-				   sesrc, &se_list_hash_rules);
-		if (sp->binding)
-		  {
-		    sesrc = (struct rx_se_list *)sp->binding;
-		    break;
-		  }
-		*new_se_list = *sesrc;
-		sp->binding = (void *)new_se_list;
-		*sepos = new_se_list;
-		++new_se_list;
-	      }
-	    *sepos = sesrc;
-	    for (destpos = &ec->destset, destlst = eclose->destset;
-		 destlst;
-		 destpos = &(*destpos)->cdr, destlst = destlst->cdr)
-	      {
-		sp = rx_hash_find (&rx->set_list_memo,
-				   ((((long)destlst->car) >> 8)
-				    ^ (long)destlst->cdr),
-				   destlst, &nfa_set_hash_rules);
-		if (sp->binding)
-		  {
-		    destlst = (struct rx_nfa_state_set *)sp->binding;
-		    break;
-		  }
-		*new_nfa_set = *destlst;
-		new_nfa_set->car = state_base + destlst->car->id;
-		sp->binding = (void *)new_nfa_set;
-		*destpos = new_nfa_set;
-		++new_nfa_set;
-	      }
-	    *destpos = destlst;
-	    eclose = eclose->next;
-	  }
-      }
-  }
-  rx_free_hash_table (&rx->se_list_memo, se_memo_freer, &se_list_hash_rules);
-  bzero (&rx->se_list_memo, sizeof (rx->se_list_memo));
-  rx_free_hash_table (&rx->set_list_memo, nfa_set_freer, &nfa_set_hash_rules);
-  bzero (&rx->set_list_memo, sizeof (rx->set_list_memo));
-
-  rx_free_nfa (rx);
-  rx->nfa_states = (struct rx_nfa_state *)*mem;
-  return 1;
-}
-
-
-/* The functions in the next several pages define the lazy-NFA-conversion used
- * by matchers.  The input to this construction is an NFA such as
- * is built by compactify_nfa (rx.c).  The output is the superNFA.
- */
-
-/* Match engines can use arbitrary values for opcodes.  So, the parse tree
- * is built using instructions names (enum rx_opcode), but the superstate
- * nfa is populated with mystery opcodes (void *).
- *
- * For convenience, here is an id table.  The opcodes are == to their inxs
- *
- * The lables in re_search_2 would make good values for instructions.
- */
-
-void * rx_id_instruction_table[rx_num_instructions] =
-{
-  (void *) rx_backtrack_point,
-  (void *) rx_do_side_effects,
-  (void *) rx_cache_miss,
-  (void *) rx_next_char,
-  (void *) rx_backtrack,
-  (void *) rx_error_inx
-};
-
-
-
-/* Memory mgt. for superstate graphs. */
-
-#ifdef __STDC__
-static char *
-rx_cache_malloc (struct rx_cache * cache, int bytes)
-#else
-static char *
-rx_cache_malloc (cache, bytes)
-     struct rx_cache * cache;
-     int bytes;
-#endif
-{
-  while (cache->bytes_left < bytes)
-    {
-      if (cache->memory_pos)
-	cache->memory_pos = cache->memory_pos->next;
-      if (!cache->memory_pos)
-	{
-	  cache->morecore (cache);
-	  if (!cache->memory_pos)
-	    return 0;
-	}
-      cache->bytes_left = cache->memory_pos->bytes;
-      cache->memory_addr = ((char *)cache->memory_pos
-			    + sizeof (struct rx_blocklist));
-    }
-  cache->bytes_left -= bytes;
-  {
-    char * addr = cache->memory_addr;
-    cache->memory_addr += bytes;
-    return addr;
-  }
-}
-
-#ifdef __STDC__
-static void
-rx_cache_free (struct rx_cache * cache,
-	       struct rx_freelist ** freelist, char * mem)
-#else
-static void
-rx_cache_free (cache, freelist, mem)
-     struct rx_cache * cache;
-     struct rx_freelist ** freelist;
-     char * mem;
-#endif
-{
-  struct rx_freelist * it = (struct rx_freelist *)mem;
-  it->next = *freelist;
-  *freelist = it;
-}
-
-
-/* The partially instantiated superstate graph has a transition
- * table at every node.  There is one entry for every character.
- * This fills in the transition for a set.
- */
-#ifdef __STDC__
-static void
-install_transition (struct rx_superstate *super,
-		    struct rx_inx *answer, rx_Bitset trcset)
-#else
-static void
-install_transition (super, answer, trcset)
-     struct rx_superstate *super;
-     struct rx_inx *answer;
-     rx_Bitset trcset;
-#endif
-{
-  struct rx_inx * transitions = super->transitions;
-  int chr;
-  for (chr = 0; chr < 256; )
-    if (!*trcset)
-      {
-	++trcset;
-	chr += 32;
-      }
-    else
-      {
-	RX_subset sub = *trcset;
-	RX_subset mask = 1;
-	int bound = chr + 32;
-	while (chr < bound)
-	  {
-	    if (sub & mask)
-	      transitions [chr] = *answer;
-	    ++chr;
-	    mask <<= 1;
-	  }
-	++trcset;
-      }
-}
-
-
-#ifdef __STDC__
-static int
-qlen (struct rx_superstate * q)
-#else
-static int
-qlen (q)
-     struct rx_superstate * q;
-#endif
-{
-  int count = 1;
-  struct rx_superstate * it;
-  if (!q)
-    return 0;
-  for (it = q->next_recyclable; it != q; it = it->next_recyclable)
-    ++count;
-  return count;
-}
-
-#ifdef __STDC__
-static void
-check_cache (struct rx_cache * cache)
-#else
-static void
-check_cache (cache)
-     struct rx_cache * cache;
-#endif
-{
-  struct rx_cache * you_fucked_up = 0;
-  int total = cache->superstates;
-  int semi = cache->semifree_superstates;
-  if (semi != qlen (cache->semifree_superstate))
-    check_cache (you_fucked_up);
-  if ((total - semi) != qlen (cache->lru_superstate))
-    check_cache (you_fucked_up);
-}
-
-/* When a superstate is old and neglected, it can enter a
- * semi-free state.  A semi-free state is slated to die.
- * Incoming transitions to a semi-free state are re-written
- * to cause an (interpreted) fault when they are taken.
- * The fault handler revives the semi-free state, patches
- * incoming transitions back to normal, and continues.
- *
- * The idea is basicly to free in two stages, aborting
- * between the two if the state turns out to be useful again.
- * When a free is aborted, the rescued superstate is placed
- * in the most-favored slot to maximize the time until it
- * is next semi-freed.
- */
-
-#ifdef __STDC__
-static void
-semifree_superstate (struct rx_cache * cache)
-#else
-static void
-semifree_superstate (cache)
-     struct rx_cache * cache;
-#endif
-{
-  int disqualified = cache->semifree_superstates;
-  if (disqualified == cache->superstates)
-    return;
-  while (cache->lru_superstate->locks)
-    {
-      cache->lru_superstate = cache->lru_superstate->next_recyclable;
-      ++disqualified;
-      if (disqualified == cache->superstates)
-	return;
-    }
-  {
-    struct rx_superstate * it = cache->lru_superstate;
-    it->next_recyclable->prev_recyclable = it->prev_recyclable;
-    it->prev_recyclable->next_recyclable = it->next_recyclable;
-    cache->lru_superstate = (it == it->next_recyclable
-			     ? 0
-			     : it->next_recyclable);
-    if (!cache->semifree_superstate)
-      {
-	cache->semifree_superstate = it;
-	it->next_recyclable = it;
-	it->prev_recyclable = it;
-      }
-    else
-      {
-	it->prev_recyclable = cache->semifree_superstate->prev_recyclable;
-	it->next_recyclable = cache->semifree_superstate;
-	it->prev_recyclable->next_recyclable = it;
-	it->next_recyclable->prev_recyclable = it;
-      }
-    {
-      struct rx_distinct_future *df;
-      it->is_semifree = 1;
-      ++cache->semifree_superstates;
-      df = it->transition_refs;
-      if (df)
-	{
-	  df->prev_same_dest->next_same_dest = 0;
-	  for (df = it->transition_refs; df; df = df->next_same_dest)
-	    {
-	      df->future_frame.inx = cache->instruction_table[rx_cache_miss];
-	      df->future_frame.data = 0;
-	      df->future_frame.data_2 = (void *) df;
-	      /* If there are any NEXT-CHAR instruction frames that
-	       * refer to this state, we convert them to CACHE-MISS frames.
-	       */
-	      if (!df->effects
-		  && (df->edge->options->next_same_super_edge[0]
-		      == df->edge->options))
-		install_transition (df->present, &df->future_frame,
-				    df->edge->cset);
-	    }
-	  df = it->transition_refs;
-	  df->prev_same_dest->next_same_dest = df;
-	}
-    }
-  }
-}
-
-
-#ifdef __STDC__
-static void
-refresh_semifree_superstate (struct rx_cache * cache,
-			     struct rx_superstate * super)
-#else
-static void
-refresh_semifree_superstate (cache, super)
-     struct rx_cache * cache;
-     struct rx_superstate * super;
-#endif
-{
-  struct rx_distinct_future *df;
-
-  if (super->transition_refs)
-    {
-      super->transition_refs->prev_same_dest->next_same_dest = 0;
-      for (df = super->transition_refs; df; df = df->next_same_dest)
-	{
-	  df->future_frame.inx = cache->instruction_table[rx_next_char];
-	  df->future_frame.data = (void *) super->transitions;
-	  /* CACHE-MISS instruction frames that refer to this state,
-	   * must be converted to NEXT-CHAR frames.
-	   */
-	  if (!df->effects
-	      && (df->edge->options->next_same_super_edge[0]
-		  == df->edge->options))
-	    install_transition (df->present, &df->future_frame,
-				df->edge->cset);
-	}
-      super->transition_refs->prev_same_dest->next_same_dest
-	= super->transition_refs;
-    }
-  if (cache->semifree_superstate == super)
-    cache->semifree_superstate = (super->prev_recyclable == super
-				  ? 0
-				  : super->prev_recyclable);
-  super->next_recyclable->prev_recyclable = super->prev_recyclable;
-  super->prev_recyclable->next_recyclable = super->next_recyclable;
-
-  if (!cache->lru_superstate)
-    (cache->lru_superstate
-     = super->next_recyclable
-     = super->prev_recyclable
-     = super);
-  else
-    {
-      super->next_recyclable = cache->lru_superstate;
-      super->prev_recyclable = cache->lru_superstate->prev_recyclable;
-      super->next_recyclable->prev_recyclable = super;
-      super->prev_recyclable->next_recyclable = super;
-    }
-  super->is_semifree = 0;
-  --cache->semifree_superstates;
-}
-
-#ifdef __STDC__
-static void
-rx_refresh_this_superstate (struct rx_cache * cache, struct rx_superstate * superstate)
-#else
-static void
-rx_refresh_this_superstate (cache, superstate)
-     struct rx_cache * cache;
-     struct rx_superstate * superstate;
-#endif
-{
-  if (superstate->is_semifree)
-    refresh_semifree_superstate (cache, superstate);
-  else if (cache->lru_superstate == superstate)
-    cache->lru_superstate = superstate->next_recyclable;
-  else if (superstate != cache->lru_superstate->prev_recyclable)
-    {
-      superstate->next_recyclable->prev_recyclable
-	= superstate->prev_recyclable;
-      superstate->prev_recyclable->next_recyclable
-	= superstate->next_recyclable;
-      superstate->next_recyclable = cache->lru_superstate;
-      superstate->prev_recyclable = cache->lru_superstate->prev_recyclable;
-      superstate->next_recyclable->prev_recyclable = superstate;
-      superstate->prev_recyclable->next_recyclable = superstate;
-    }
-}
-
-#ifdef __STDC__
-static void
-release_superset_low (struct rx_cache * cache,
-		     struct rx_superset *set)
-#else
-static void
-release_superset_low (cache, set)
-     struct rx_cache * cache;
-     struct rx_superset *set;
-#endif
-{
-  if (!--set->refs)
-    {
-      if (set->cdr)
-	release_superset_low (cache, set->cdr);
-
-      set->starts_for = 0;
-
-      rx_hash_free
-	(rx_hash_find
-	 (&cache->superset_table,
-	  (unsigned long)set->car ^ set->id ^ (unsigned long)set->cdr,
-	  (void *)set,
-	  &cache->superset_hash_rules),
-	 &cache->superset_hash_rules);
-      rx_cache_free (cache, &cache->free_supersets, (char *)set);
-    }
-}
-
-#ifdef __STDC__
-RX_DECL void
-rx_release_superset (struct rx *rx,
-		     struct rx_superset *set)
-#else
-RX_DECL void
-rx_release_superset (rx, set)
-     struct rx *rx;
-     struct rx_superset *set;
-#endif
-{
-  release_superset_low (rx->cache, set);
-}
-
-/* This tries to add a new superstate to the superstate freelist.
- * It might, as a result, free some edge pieces or hash tables.
- * If nothing can be freed because too many locks are being held, fail.
- */
-
-#ifdef __STDC__
-static int
-rx_really_free_superstate (struct rx_cache * cache)
-#else
-static int
-rx_really_free_superstate (cache)
-     struct rx_cache * cache;
-#endif
-{
-  int locked_superstates = 0;
-  struct rx_superstate * it;
-
-  if (!cache->superstates)
-    return 0;
-
-  {
-    /* This is a total guess.  The idea is that we should expect as
-     * many misses as we've recently experienced.  I.e., cache->misses
-     * should be the same as cache->semifree_superstates.
-     */
-    while ((cache->hits + cache->misses) > cache->superstates_allowed)
-      {
-	cache->hits >>= 1;
-	cache->misses >>= 1;
-      }
-    if (  ((cache->hits + cache->misses) * cache->semifree_superstates)
-	< (cache->superstates		 * cache->misses))
-      {
-	semifree_superstate (cache);
-	semifree_superstate (cache);
-      }
-  }
-
-  while (cache->semifree_superstate && cache->semifree_superstate->locks)
-    {
-      refresh_semifree_superstate (cache, cache->semifree_superstate);
-      ++locked_superstates;
-      if (locked_superstates == cache->superstates)
-	return 0;
-    }
-
-  if (cache->semifree_superstate)
-    {
-      it = cache->semifree_superstate;
-      it->next_recyclable->prev_recyclable = it->prev_recyclable;
-      it->prev_recyclable->next_recyclable = it->next_recyclable;
-      cache->semifree_superstate = ((it == it->next_recyclable)
-				    ? 0
-				    : it->next_recyclable);
-      --cache->semifree_superstates;
-    }
-  else
-    {
-      while (cache->lru_superstate->locks)
-	{
-	  cache->lru_superstate = cache->lru_superstate->next_recyclable;
-	  ++locked_superstates;
-	  if (locked_superstates == cache->superstates)
-	    return 0;
-	}
-      it = cache->lru_superstate;
-      it->next_recyclable->prev_recyclable = it->prev_recyclable;
-      it->prev_recyclable->next_recyclable = it->next_recyclable;
-      cache->lru_superstate = ((it == it->next_recyclable)
-				    ? 0
-				    : it->next_recyclable);
-    }
-
-  if (it->transition_refs)
-    {
-      struct rx_distinct_future *df;
-      for (df = it->transition_refs,
-	   df->prev_same_dest->next_same_dest = 0;
-	   df;
-	   df = df->next_same_dest)
-	{
-	  df->future_frame.inx = cache->instruction_table[rx_cache_miss];
-	  df->future_frame.data = 0;
-	  df->future_frame.data_2 = (void *) df;
-	  df->future = 0;
-	}
-      it->transition_refs->prev_same_dest->next_same_dest =
-	it->transition_refs;
-    }
-  {
-    struct rx_super_edge *tc = it->edges;
-    while (tc)
-      {
-	struct rx_distinct_future * df;
-	struct rx_super_edge *tct = tc->next;
-	df = tc->options;
-	df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
-	while (df)
-	  {
-	    struct rx_distinct_future *dft = df;
-	    df = df->next_same_super_edge[0];
-
-
-	    if (dft->future && dft->future->transition_refs == dft)
-	      {
-		dft->future->transition_refs = dft->next_same_dest;
-		if (dft->future->transition_refs == dft)
-		  dft->future->transition_refs = 0;
-	      }
-	    dft->next_same_dest->prev_same_dest = dft->prev_same_dest;
-	    dft->prev_same_dest->next_same_dest = dft->next_same_dest;
-	    rx_cache_free (cache, &cache->free_discernable_futures,
-			   (char *)dft);
-	  }
-	rx_cache_free (cache, &cache->free_transition_classes, (char *)tc);
-	tc = tct;
-      }
-  }
-
-  if (it->contents->superstate == it)
-    it->contents->superstate = 0;
-  release_superset_low (cache, it->contents);
-  rx_cache_free (cache, &cache->free_superstates, (char *)it);
-  --cache->superstates;
-  return 1;
-}
-
-#ifdef __STDC__
-static char *
-rx_cache_get (struct rx_cache * cache,
-	      struct rx_freelist ** freelist)
-#else
-static char *
-rx_cache_get (cache, freelist)
-     struct rx_cache * cache;
-     struct rx_freelist ** freelist;
-#endif
-{
-  while (!*freelist && rx_really_free_superstate (cache))
-    ;
-  if (!*freelist)
-    return 0;
-  {
-    struct rx_freelist * it = *freelist;
-    *freelist = it->next;
-    return (char *)it;
-  }
-}
-
-#ifdef __STDC__
-static char *
-rx_cache_malloc_or_get (struct rx_cache * cache,
-			struct rx_freelist ** freelist, int bytes)
-#else
-static char *
-rx_cache_malloc_or_get (cache, freelist, bytes)
-     struct rx_cache * cache;
-     struct rx_freelist ** freelist;
-     int bytes;
-#endif
-{
-  if (!*freelist)
-    {
-      char * answer = rx_cache_malloc (cache, bytes);
-      if (answer)
-	return answer;
-    }
-
-  return rx_cache_get (cache, freelist);
-}
-
-#ifdef __STDC__
-static char *
-rx_cache_get_superstate (struct rx_cache * cache)
-#else
-static char *
-rx_cache_get_superstate (cache)
-	  struct rx_cache * cache;
-#endif
-{
-  char * answer;
-  int bytes = (   sizeof (struct rx_superstate)
-	       +  cache->local_cset_size * sizeof (struct rx_inx));
-  if (!cache->free_superstates
-      && (cache->superstates < cache->superstates_allowed))
-    {
-      answer = rx_cache_malloc (cache, bytes);
-      if (answer)
-	{
-	  ++cache->superstates;
-	  return answer;
-	}
-    }
-  answer = rx_cache_get (cache, &cache->free_superstates);
-  if (!answer)
-    {
-      answer = rx_cache_malloc (cache, bytes);
-      if (answer)
-	++cache->superstates_allowed;
-    }
-  ++cache->superstates;
-  return answer;
-}
-
-
-
-#ifdef __STDC__
-static int
-supersetcmp (void * va, void * vb)
-#else
-static int
-supersetcmp (va, vb)
-     void * va;
-     void * vb;
-#endif
-{
-  struct rx_superset * a = (struct rx_superset *)va;
-  struct rx_superset * b = (struct rx_superset *)vb;
-  return (   (a == b)
-	  || (a && b && (a->car == b->car) && (a->cdr == b->cdr)));
-}
-
-#ifdef __STDC__
-static struct rx_hash_item *
-superset_allocator (struct rx_hash_rules * rules, void * val)
-#else
-static struct rx_hash_item *
-superset_allocator (rules, val)
-     struct rx_hash_rules * rules;
-     void * val;
-#endif
-{
-  struct rx_cache * cache
-    = ((struct rx_cache *)
-       ((char *)rules
-	- (unsigned long)(&((struct rx_cache *)0)->superset_hash_rules)));
-  struct rx_superset * template = (struct rx_superset *)val;
-  struct rx_superset * newset
-    = ((struct rx_superset *)
-       rx_cache_malloc_or_get (cache,
-			       &cache->free_supersets,
-			       sizeof (*template)));
-  if (!newset)
-    return 0;
-  newset->refs = 0;
-  newset->car = template->car;
-  newset->id = template->car->id;
-  newset->cdr = template->cdr;
-  newset->superstate = 0;
-  rx_protect_superset (rx, template->cdr);
-  newset->hash_item.data = (void *)newset;
-  newset->hash_item.binding = 0;
-  return &newset->hash_item;
-}
-
-#ifdef __STDC__
-static struct rx_hash *
-super_hash_allocator (struct rx_hash_rules * rules)
-#else
-static struct rx_hash *
-super_hash_allocator (rules)
-     struct rx_hash_rules * rules;
-#endif
-{
-  struct rx_cache * cache
-    = ((struct rx_cache *)
-       ((char *)rules
-	- (unsigned long)(&((struct rx_cache *)0)->superset_hash_rules)));
-  return ((struct rx_hash *)
-	  rx_cache_malloc_or_get (cache,
-				  &cache->free_hash, sizeof (struct rx_hash)));
-}
-
-
-#ifdef __STDC__
-static void
-super_hash_liberator (struct rx_hash * hash, struct rx_hash_rules * rules)
-#else
-static void
-super_hash_liberator (hash, rules)
-     struct rx_hash * hash;
-     struct rx_hash_rules * rules;
-#endif
-{
-  struct rx_cache * cache
-    = ((struct rx_cache *)
-       (char *)rules - (long)(&((struct rx_cache *)0)->superset_hash_rules));
-  rx_cache_free (cache, &cache->free_hash, (char *)hash);
-}
-
-#ifdef __STDC__
-static void
-superset_hash_item_liberator (struct rx_hash_item * it,
-			      struct rx_hash_rules * rules)
-#else
-static void
-superset_hash_item_liberator (it, rules) /* Well, it does ya know. */
-     struct rx_hash_item * it;
-     struct rx_hash_rules * rules;
-#endif
-{
-}
-
-int rx_cache_bound = 128;
-static int rx_default_cache_got = 0;
-
-#ifdef __STDC__
-static int
-bytes_for_cache_size (int supers, int cset_size)
-#else
-static int
-bytes_for_cache_size (supers, cset_size)
-     int supers;
-     int cset_size;
-#endif
-{
-  /* What the hell is this? !!!*/
-  return (int)
-    ((float)supers *
-     (  (1.03 * (float) (  rx_sizeof_bitset (cset_size)
-			 + sizeof (struct rx_super_edge)))
-      + (1.80 * (float) sizeof (struct rx_possible_future))
-      + (float) (  sizeof (struct rx_superstate)
-		 + cset_size * sizeof (struct rx_inx))));
-}
-
-#ifdef __STDC__
-static void
-rx_morecore (struct rx_cache * cache)
-#else
-static void
-rx_morecore (cache)
-     struct rx_cache * cache;
-#endif
-{
-  if (rx_default_cache_got >= rx_cache_bound)
-    return;
-
-  rx_default_cache_got += 16;
-  cache->superstates_allowed = rx_cache_bound;
-  {
-    struct rx_blocklist ** pos = &cache->memory;
-    int size = bytes_for_cache_size (16, cache->local_cset_size);
-    while (*pos)
-      pos = &(*pos)->next;
-    *pos = ((struct rx_blocklist *)
-	    malloc (size + sizeof (struct rx_blocklist)));
-    if (!*pos)
-      return;
-
-    (*pos)->next = 0;
-    (*pos)->bytes = size;
-    cache->memory_pos = *pos;
-    cache->memory_addr = (char *)*pos + sizeof (**pos);
-    cache->bytes_left = size;
-  }
-}
-
-static struct rx_cache default_cache =
-{
-  {
-    supersetcmp,
-    super_hash_allocator,
-    super_hash_liberator,
-    superset_allocator,
-    superset_hash_item_liberator,
-  },
-  0,
-  0,
-  0,
-  0,
-  rx_morecore,
-
-  0,
-  0,
-  0,
-  0,
-  0,
-
-  0,
-  0,
-
-  0,
-
-  0,
-  0,
-  0,
-  0,
-  128,
-
-  256,
-  rx_id_instruction_table,
-
-  {
-    0,
-    0,
-    {0},
-    {0},
-    {0}
-  }
-};
-
-/* This adds an element to a superstate set.  These sets are lists, such
- * that lists with == elements are ==.  The empty set is returned by
- * superset_cons (rx, 0, 0) and is NOT equivelent to
- * (struct rx_superset)0.
- */
-
-#ifdef __STDC__
-RX_DECL struct rx_superset *
-rx_superset_cons (struct rx * rx,
-		  struct rx_nfa_state *car, struct rx_superset *cdr)
-#else
-RX_DECL struct rx_superset *
-rx_superset_cons (rx, car, cdr)
-     struct rx * rx;
-     struct rx_nfa_state *car;
-     struct rx_superset *cdr;
-#endif
-{
-  struct rx_cache * cache = rx->cache;
-  if (!car && !cdr)
-    {
-      if (!cache->empty_superset)
-	{
-	  cache->empty_superset
-	    = ((struct rx_superset *)
-	       rx_cache_malloc_or_get (cache, &cache->free_supersets,
-				       sizeof (struct rx_superset)));
-	  if (!cache->empty_superset)
-	    return 0;
-	  bzero (cache->empty_superset, sizeof (struct rx_superset));
-	  cache->empty_superset->refs = 1000;
-	}
-      return cache->empty_superset;
-    }
-  {
-    struct rx_superset template;
-    struct rx_hash_item * hit;
-    template.car = car;
-    template.cdr = cdr;
-    template.id = car->id;
-    hit = rx_hash_store (&cache->superset_table,
-			 (unsigned long)car ^ car->id ^ (unsigned long)cdr,
-			 (void *)&template,
-			 &cache->superset_hash_rules);
-    return (hit
-	    ?  (struct rx_superset *)hit->data
-	    : 0);
-  }
-}
-
-/* This computes a union of two NFA state sets.  The sets do not have the
- * same representation though.  One is a RX_SUPERSET structure (part
- * of the superstate NFA) and the other is an NFA_STATE_SET (part of the NFA).
- */
-
-#ifdef __STDC__
-RX_DECL struct rx_superset *
-rx_superstate_eclosure_union
-  (struct rx * rx, struct rx_superset *set, struct rx_nfa_state_set *ecl)
-#else
-RX_DECL struct rx_superset *
-rx_superstate_eclosure_union (rx, set, ecl)
-     struct rx * rx;
-     struct rx_superset *set;
-     struct rx_nfa_state_set *ecl;
-#endif
-{
-  if (!ecl)
-    return set;
-
-  if (!set->car)
-    return rx_superset_cons (rx, ecl->car,
-			     rx_superstate_eclosure_union (rx, set, ecl->cdr));
-  if (set->car == ecl->car)
-    return rx_superstate_eclosure_union (rx, set, ecl->cdr);
-
-  {
-    struct rx_superset * tail;
-    struct rx_nfa_state * first;
-
-    if (set->car > ecl->car)
-      {
-	tail = rx_superstate_eclosure_union (rx, set->cdr, ecl);
-	first = set->car;
-      }
-    else
-      {
-	tail = rx_superstate_eclosure_union (rx, set, ecl->cdr);
-	first = ecl->car;
-      }
-    if (!tail)
-      return 0;
-    else
-      {
-	struct rx_superset * answer;
-	answer = rx_superset_cons (rx, first, tail);
-	if (!answer)
-	  {
-	    rx_protect_superset (rx, tail);
-	    rx_release_superset (rx, tail);
-	    return 0;
-	  }
-	else
-	  return answer;
-      }
-  }
-}
-
-
-
-
-/*
- * This makes sure that a list of rx_distinct_futures contains
- * a future for each possible set of side effects in the eclosure
- * of a given state.  This is some of the work of filling in a
- * superstate transition.
- */
-
-#ifdef __STDC__
-static struct rx_distinct_future *
-include_futures (struct rx *rx,
-		 struct rx_distinct_future *df, struct rx_nfa_state
-		 *state, struct rx_superstate *superstate)
-#else
-static struct rx_distinct_future *
-include_futures (rx, df, state, superstate)
-     struct rx *rx;
-     struct rx_distinct_future *df;
-     struct rx_nfa_state *state;
-     struct rx_superstate *superstate;
-#endif
-{
-  struct rx_possible_future *future;
-  struct rx_cache * cache = rx->cache;
-  for (future = state->futures; future; future = future->next)
-    {
-      struct rx_distinct_future *dfp;
-      struct rx_distinct_future *insert_before = 0;
-      if (df)
-	df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
-      for (dfp = df; dfp; dfp = dfp->next_same_super_edge[0])
-	if (dfp->effects == future->effects)
-	  break;
-	else
-	  {
-	    int order = rx->se_list_cmp (rx, dfp->effects, future->effects);
-	    if (order > 0)
-	      {
-		insert_before = dfp;
-		dfp = 0;
-		break;
-	      }
-	  }
-      if (df)
-	df->next_same_super_edge[1]->next_same_super_edge[0] = df;
-      if (!dfp)
-	{
-	  dfp
-	    = ((struct rx_distinct_future *)
-	       rx_cache_malloc_or_get (cache, &cache->free_discernable_futures,
-				       sizeof (struct rx_distinct_future)));
-	  if (!dfp)
-	    return 0;
-	  if (!df)
-	    {
-	      df = insert_before = dfp;
-	      df->next_same_super_edge[0] = df->next_same_super_edge[1] = df;
-	    }
-	  else if (!insert_before)
-	    insert_before = df;
-	  else if (insert_before == df)
-	    df = dfp;
-
-	  dfp->next_same_super_edge[0] = insert_before;
-	  dfp->next_same_super_edge[1]
-	    = insert_before->next_same_super_edge[1];
-	  dfp->next_same_super_edge[1]->next_same_super_edge[0] = dfp;
-	  dfp->next_same_super_edge[0]->next_same_super_edge[1] = dfp;
-	  dfp->next_same_dest = dfp->prev_same_dest = dfp;
-	  dfp->future = 0;
-	  dfp->present = superstate;
-	  dfp->future_frame.inx = rx->instruction_table[rx_cache_miss];
-	  dfp->future_frame.data = 0;
-	  dfp->future_frame.data_2 = (void *) dfp;
-	  dfp->side_effects_frame.inx
-	    = rx->instruction_table[rx_do_side_effects];
-	  dfp->side_effects_frame.data = 0;
-	  dfp->side_effects_frame.data_2 = (void *) dfp;
-	  dfp->effects = future->effects;
-	}
-    }
-  return df;
-}
-
-
-
-/* This constructs a new superstate from its state set.  The only
- * complexity here is memory management.
- */
-#ifdef __STDC__
-RX_DECL struct rx_superstate *
-rx_superstate (struct rx *rx,
-	       struct rx_superset *set)
-#else
-RX_DECL struct rx_superstate *
-rx_superstate (rx, set)
-     struct rx *rx;
-     struct rx_superset *set;
-#endif
-{
-  struct rx_cache * cache = rx->cache;
-  struct rx_superstate * superstate = 0;
-
-  /* Does the superstate already exist in the cache? */
-  if (set->superstate)
-    {
-      if (set->superstate->rx_id != rx->rx_id)
-	{
-	  /* Aha.  It is in the cache, but belongs to a superstate
-	   * that refers to an NFA that no longer exists.
-	   * (We know it no longer exists because it was evidently
-	   *  stored in the same region of memory as the current nfa
-	   *  yet it has a different id.)
-	   */
-	  superstate = set->superstate;
-	  if (!superstate->is_semifree)
-	    {
-	      if (cache->lru_superstate == superstate)
-		{
-		  cache->lru_superstate = superstate->next_recyclable;
-		  if (cache->lru_superstate == superstate)
-		    cache->lru_superstate = 0;
-		}
-	      {
-		superstate->next_recyclable->prev_recyclable
-		  = superstate->prev_recyclable;
-		superstate->prev_recyclable->next_recyclable
-		  = superstate->next_recyclable;
-		if (!cache->semifree_superstate)
-		  {
-		    (cache->semifree_superstate
-		     = superstate->next_recyclable
-		     = superstate->prev_recyclable
-		     = superstate);
-		  }
-		else
-		  {
-		    superstate->next_recyclable = cache->semifree_superstate;
-		    superstate->prev_recyclable
-		      = cache->semifree_superstate->prev_recyclable;
-		    superstate->next_recyclable->prev_recyclable
-		      = superstate;
-		    superstate->prev_recyclable->next_recyclable
-		      = superstate;
-		    cache->semifree_superstate = superstate;
-		  }
-		++cache->semifree_superstates;
-	      }
-	    }
-	  set->superstate = 0;
-	  goto handle_cache_miss;
-	}
-      ++cache->hits;
-      superstate = set->superstate;
-
-      rx_refresh_this_superstate (cache, superstate);
-      return superstate;
-    }
-
- handle_cache_miss:
-
-  /* This point reached only for cache misses. */
-  ++cache->misses;
-#if RX_DEBUG
-  if (rx_debug_trace > 1)
-    {
-      struct rx_superset * setp = set;
-      fprintf (stderr, "Building a superstet %d(%d): ", rx->rx_id, set);
-      while (setp)
-	{
-	  fprintf (stderr, "%d ", setp->id);
-	  setp = setp->cdr;
-	}
-      fprintf (stderr, "(%d)\n", set);
-    }
-#endif
-  superstate = (struct rx_superstate *)rx_cache_get_superstate (cache);
-  if (!superstate)
-    return 0;
-
-  if (!cache->lru_superstate)
-    (cache->lru_superstate
-     = superstate->next_recyclable
-     = superstate->prev_recyclable
-     = superstate);
-  else
-    {
-      superstate->next_recyclable = cache->lru_superstate;
-      superstate->prev_recyclable = cache->lru_superstate->prev_recyclable;
-      (  superstate->prev_recyclable->next_recyclable
-       = superstate->next_recyclable->prev_recyclable
-       = superstate);
-    }
-  superstate->rx_id = rx->rx_id;
-  superstate->transition_refs = 0;
-  superstate->locks = 0;
-  superstate->is_semifree = 0;
-  set->superstate = superstate;
-  superstate->contents = set;
-  rx_protect_superset (rx, set);
-  superstate->edges = 0;
-  {
-    int x;
-    /* None of the transitions from this superstate are known yet. */
-    for (x = 0; x < rx->local_cset_size; ++x) /* &&&&& 3.8 % */
-      {
-	struct rx_inx * ifr = &superstate->transitions[x];
-	ifr->inx = rx->instruction_table [rx_cache_miss];
-	ifr->data = ifr->data_2 = 0;
-      }
-  }
-  return superstate;
-}
-
-
-/* This computes the destination set of one edge of the superstate NFA.
- * Note that a RX_DISTINCT_FUTURE is a superstate edge.
- * Returns 0 on an allocation failure.
- */
-
-#ifdef __STDC__
-static int
-solve_destination (struct rx *rx, struct rx_distinct_future *df)
-#else
-static int
-solve_destination (rx, df)
-     struct rx *rx;
-     struct rx_distinct_future *df;
-#endif
-{
-  struct rx_super_edge *tc = df->edge;
-  struct rx_superset *nfa_state;
-  struct rx_superset *nil_set = rx_superset_cons (rx, 0, 0);
-  struct rx_superset *solution = nil_set;
-  struct rx_superstate *dest;
-
-  rx_protect_superset (rx, solution);
-  /* Iterate over all NFA states in the state set of this superstate. */
-  for (nfa_state = df->present->contents;
-       nfa_state->car;
-       nfa_state = nfa_state->cdr)
-    {
-      struct rx_nfa_edge *e;
-      /* Iterate over all edges of each NFA state. */
-      for (e = nfa_state->car->edges; e; e = e->next)
-        /* If we find an edge that is labeled with
-	 * the characters we are solving for.....
-	 */
-	if (rx_bitset_is_subset (rx->local_cset_size,
-				 tc->cset, e->params.cset))
-	  {
-	    struct rx_nfa_state *n = e->dest;
-	    struct rx_possible_future *pf;
-	    /* ....search the partial epsilon closures of the destination
-	     * of that edge for a path that involves the same set of
-	     * side effects we are solving for.
-	     * If we find such a RX_POSSIBLE_FUTURE, we add members to the
-	     * stateset we are computing.
-	     */
-	    for (pf = n->futures; pf; pf = pf->next)
-	      if (pf->effects == df->effects)
-		{
-		  struct rx_superset * old_sol;
-		  old_sol = solution;
-		  solution = rx_superstate_eclosure_union (rx, solution,
-							   pf->destset);
-		  if (!solution)
-		    return 0;
-		  rx_protect_superset (rx, solution);
-		  rx_release_superset (rx, old_sol);
-		}
-	  }
-    }
-  /* It is possible that the RX_DISTINCT_FUTURE we are working on has
-   * the empty set of NFA states as its definition.  In that case, this
-   * is a failure point.
-   */
-  if (solution == nil_set)
-    {
-      df->future_frame.inx = (void *) rx_backtrack;
-      df->future_frame.data = 0;
-      df->future_frame.data_2 = 0;
-      return 1;
-    }
-  dest = rx_superstate (rx, solution);
-  rx_release_superset (rx, solution);
-  if (!dest)
-    return 0;
-
-  {
-    struct rx_distinct_future *dft;
-    dft = df;
-    df->prev_same_dest->next_same_dest = 0;
-    while (dft)
-      {
-	dft->future = dest;
-	dft->future_frame.inx = rx->instruction_table[rx_next_char];
-	dft->future_frame.data = (void *) dest->transitions;
-	dft = dft->next_same_dest;
-      }
-    df->prev_same_dest->next_same_dest = df;
-  }
-  if (!dest->transition_refs)
-    dest->transition_refs = df;
-  else
-    {
-      struct rx_distinct_future *dft = dest->transition_refs->next_same_dest;
-      dest->transition_refs->next_same_dest = df->next_same_dest;
-      df->next_same_dest->prev_same_dest = dest->transition_refs;
-      df->next_same_dest = dft;
-      dft->prev_same_dest = df;
-    }
-  return 1;
-}
-
-
-/* This takes a superstate and a character, and computes some edges
- * from the superstate NFA.  In particular, this computes all edges
- * that lead from SUPERSTATE given CHR.   This function also
- * computes the set of characters that share this edge set.
- * This returns 0 on allocation error.
- * The character set and list of edges are returned through
- * the paramters CSETOUT and DFOUT.
-} */
-
-#ifdef __STDC__
-static int
-compute_super_edge (struct rx *rx, struct rx_distinct_future **dfout,
-			  rx_Bitset csetout, struct rx_superstate *superstate,
-			  unsigned char chr)
-#else
-static int
-compute_super_edge (rx, dfout, csetout, superstate, chr)
-     struct rx *rx;
-     struct rx_distinct_future **dfout;
-     rx_Bitset csetout;
-     struct rx_superstate *superstate;
-     unsigned char chr;
-#endif
-{
-  struct rx_superset *stateset = superstate->contents;
-
-  /* To compute the set of characters that share edges with CHR,
-   * we start with the full character set, and subtract.
-   */
-  rx_bitset_universe (rx->local_cset_size, csetout);
-  *dfout = 0;
-
-  /* Iterate over the NFA states in the superstate state-set. */
-  while (stateset->car)
-    {
-      struct rx_nfa_edge *e;
-      for (e = stateset->car->edges; e; e = e->next)
-	if (RX_bitset_member (e->params.cset, chr))
-	  {
-	    /* If we find an NFA edge that applies, we make sure there
-	     * are corresponding edges in the superstate NFA.
-	     */
-	    {
-	      struct rx_distinct_future * saved;
-	      saved = *dfout;
-	      *dfout = include_futures (rx, *dfout, e->dest, superstate);
-	      if (!*dfout)
-		{
-		  struct rx_distinct_future * df;
-		  df = saved;
-		  if (df)
-		    df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
-		  while (df)
-		    {
-		      struct rx_distinct_future *dft;
-		      dft = df;
-		      df = df->next_same_super_edge[0];
-
-		      if (dft->future && dft->future->transition_refs == dft)
-			{
-			  dft->future->transition_refs = dft->next_same_dest;
-			  if (dft->future->transition_refs == dft)
-			    dft->future->transition_refs = 0;
-			}
-		      dft->next_same_dest->prev_same_dest = dft->prev_same_dest;
-		      dft->prev_same_dest->next_same_dest = dft->next_same_dest;
-		      rx_cache_free (rx->cache,
-				     &rx->cache->free_discernable_futures,
-				     (char *)dft);
-		    }
-		  return 0;
-		}
-	    }
-	    /* We also trim the character set a bit. */
-	    rx_bitset_intersection (rx->local_cset_size,
-				    csetout, e->params.cset);
-	  }
-	else
-	  /* An edge that doesn't apply at least tells us some characters
-	   * that don't share the same edge set as CHR.
-	   */
-	  rx_bitset_difference (rx->local_cset_size, csetout, e->params.cset);
-      stateset = stateset->cdr;
-    }
-  return 1;
-}
-
-
-/* This is a constructor for RX_SUPER_EDGE structures.  These are
- * wrappers for lists of superstate NFA edges that share character sets labels.
- * If a transition class contains more than one rx_distinct_future (superstate
- * edge), then it represents a non-determinism in the superstate NFA.
- */
-
-#ifdef __STDC__
-static struct rx_super_edge *
-rx_super_edge (struct rx *rx,
-	       struct rx_superstate *super, rx_Bitset cset,
-	       struct rx_distinct_future *df)
-#else
-static struct rx_super_edge *
-rx_super_edge (rx, super, cset, df)
-     struct rx *rx;
-     struct rx_superstate *super;
-     rx_Bitset cset;
-     struct rx_distinct_future *df;
-#endif
-{
-  struct rx_super_edge *tc =
-    (struct rx_super_edge *)rx_cache_malloc_or_get
-      (rx->cache, &rx->cache->free_transition_classes,
-       sizeof (struct rx_super_edge) + rx_sizeof_bitset (rx->local_cset_size));
-
-  if (!tc)
-    return 0;
-  tc->next = super->edges;
-  super->edges = tc;
-  tc->rx_backtrack_frame.inx = rx->instruction_table[rx_backtrack_point];
-  tc->rx_backtrack_frame.data = 0;
-  tc->rx_backtrack_frame.data_2 = (void *) tc;
-  tc->options = df;
-  tc->cset = (rx_Bitset) ((char *) tc + sizeof (*tc));
-  rx_bitset_assign (rx->local_cset_size, tc->cset, cset);
-  if (df)
-    {
-      struct rx_distinct_future * dfp = df;
-      df->next_same_super_edge[1]->next_same_super_edge[0] = 0;
-      while (dfp)
-	{
-	  dfp->edge = tc;
-	  dfp = dfp->next_same_super_edge[0];
-	}
-      df->next_same_super_edge[1]->next_same_super_edge[0] = df;
-    }
-  return tc;
-}
-
-
-/* There are three kinds of cache miss.  The first occurs when a
- * transition is taken that has never been computed during the
- * lifetime of the source superstate.  That cache miss is handled by
- * calling COMPUTE_SUPER_EDGE.  The second kind of cache miss
- * occurs when the destination superstate of a transition doesn't
- * exist.  SOLVE_DESTINATION is used to construct the destination superstate.
- * Finally, the third kind of cache miss occurs when the destination
- * superstate of a transition is in a `semi-free state'.  That case is
- * handled by UNFREE_SUPERSTATE.
- *
- * The function of HANDLE_CACHE_MISS is to figure out which of these
- * cases applies.
- */
-
-#ifdef __STDC__
-static void
-install_partial_transition  (struct rx_superstate *super,
-			     struct rx_inx *answer,
-			     RX_subset set, int offset)
-#else
-static void
-install_partial_transition  (super, answer, set, offset)
-     struct rx_superstate *super;
-     struct rx_inx *answer;
-     RX_subset set;
-     int offset;
-#endif
-{
-  int start = offset;
-  int end = start + 32;
-  RX_subset pos = 1;
-  struct rx_inx * transitions = super->transitions;
-
-  while (start < end)
-    {
-      if (set & pos)
-	transitions[start] = *answer;
-      pos <<= 1;
-      ++start;
-    }
-}
-
-
-#ifdef __STDC__
-RX_DECL struct rx_inx *
-rx_handle_cache_miss
-  (struct rx *rx, struct rx_superstate *super, unsigned char chr, void *data)
-#else
-RX_DECL struct rx_inx *
-rx_handle_cache_miss (rx, super, chr, data)
-     struct rx *rx;
-     struct rx_superstate *super;
-     unsigned char chr;
-     void *data;
-#endif
-{
-  int offset = chr / RX_subset_bits;
-  struct rx_distinct_future *df = data;
-
-  if (!df)			/* must be the shared_cache_miss_frame */
-    {
-      /* Perhaps this is just a transition waiting to be filled. */
-      struct rx_super_edge *tc;
-      RX_subset mask = rx_subset_singletons [chr % RX_subset_bits];
-
-      for (tc = super->edges; tc; tc = tc->next)
-	if (tc->cset[offset] & mask)
-	  {
-	    struct rx_inx * answer;
-	    df = tc->options;
-	    answer = ((tc->options->next_same_super_edge[0] != tc->options)
-		      ? &tc->rx_backtrack_frame
-		      : (df->effects
-			 ? &df->side_effects_frame
-			 : &df->future_frame));
-	    install_partial_transition (super, answer,
-					tc->cset [offset], offset * 32);
-	    return answer;
-	  }
-      /* Otherwise, it's a flushed or  newly encountered edge. */
-      {
-	char cset_space[1024];	/* this limit is far from unreasonable */
-	rx_Bitset trcset;
-	struct rx_inx *answer;
-
-	if (rx_sizeof_bitset (rx->local_cset_size) > sizeof (cset_space))
-	  return 0;		/* If the arbitrary limit is hit, always fail */
-				/* cleanly. */
-	trcset = (rx_Bitset)cset_space;
-	rx_lock_superstate (rx, super);
-	if (!compute_super_edge (rx, &df, trcset, super, chr))
-	  {
-	    rx_unlock_superstate (rx, super);
-	    return 0;
-	  }
-	if (!df)		/* We just computed the fail transition. */
-	  {
-	    static struct rx_inx
-	      shared_fail_frame = { 0, 0, (void *)rx_backtrack, 0 };
-	    answer = &shared_fail_frame;
-	  }
-	else
-	  {
-	    tc = rx_super_edge (rx, super, trcset, df);
-	    if (!tc)
-	      {
-		rx_unlock_superstate (rx, super);
-		return 0;
-	      }
-	    answer = ((tc->options->next_same_super_edge[0] != tc->options)
-		      ? &tc->rx_backtrack_frame
-		      : (df->effects
-			 ? &df->side_effects_frame
-			 : &df->future_frame));
-	  }
-	install_partial_transition (super, answer,
-				    trcset[offset], offset * 32);
-	rx_unlock_superstate (rx, super);
-	return answer;
-      }
-    }
-  else if (df->future) /* A cache miss on an edge with a future? Must be
-			* a semi-free destination. */
-    {
-      if (df->future->is_semifree)
-	refresh_semifree_superstate (rx->cache, df->future);
-      return &df->future_frame;
-    }
-  else
-    /* no future superstate on an existing edge */
-    {
-      rx_lock_superstate (rx, super);
-      if (!solve_destination (rx, df))
-	{
-	  rx_unlock_superstate (rx, super);
-	  return 0;
-	}
-      if (!df->effects
-	  && (df->edge->options->next_same_super_edge[0] == df->edge->options))
-	install_partial_transition (super, &df->future_frame,
-				    df->edge->cset[offset], offset * 32);
-      rx_unlock_superstate (rx, super);
-      return &df->future_frame;
-    }
-}
-
-
-
-
-/* The rest of the code provides a regex.c compatable interface. */
-
-
-__const__ char *re_error_msg[] =
-{
-  0,						/* REG_NOUT */
-  "No match",					/* REG_NOMATCH */
-  "Invalid regular expression",			/* REG_BADPAT */
-  "Invalid collation character",		/* REG_ECOLLATE */
-  "Invalid character class name",		/* REG_ECTYPE */
-  "Trailing backslash",				/* REG_EESCAPE */
-  "Invalid back reference",			/* REG_ESUBREG */
-  "Unmatched [ or [^",				/* REG_EBRACK */
-  "Unmatched ( or \\(",				/* REG_EPAREN */
-  "Unmatched \\{",				/* REG_EBRACE */
-  "Invalid content of \\{\\}",			/* REG_BADBR */
-  "Invalid range end",				/* REG_ERANGE */
-  "Memory exhausted",				/* REG_ESPACE */
-  "Invalid preceding regular expression",	/* REG_BADRPT */
-  "Premature end of regular expression",	/* REG_EEND */
-  "Regular expression too big",			/* REG_ESIZE */
-  "Unmatched ) or \\)",				/* REG_ERPAREN */
-};
-
-
-
-/*
- * Macros used while compiling patterns.
- *
- * By convention, PEND points just past the end of the uncompiled pattern,
- * P points to the read position in the pattern.  `translate' is the name
- * of the translation table (`TRANSLATE' is the name of a macro that looks
- * things up in `translate').
- */
-
-
-/*
- * Fetch the next character in the uncompiled pattern---translating it
- * if necessary. *Also cast from a signed character in the constant
- * string passed to us by the user to an unsigned char that we can use
- * as an array index (in, e.g., `translate').
- */
-#define PATFETCH(c)							\
- do {if (p == pend) return REG_EEND;					\
-    c = (unsigned char) *p++;						\
-    c = translate[c];		 					\
- } while (0)
-
-/*
- * Fetch the next character in the uncompiled pattern, with no
- * translation.
- */
-#define PATFETCH_RAW(c)							\
-  do {if (p == pend) return REG_EEND;					\
-    c = (unsigned char) *p++; 						\
-  } while (0)
-
-/* Go backwards one character in the pattern.  */
-#define PATUNFETCH p--
-
-
-#define TRANSLATE(d) translate[(unsigned char) (d)]
-
-typedef unsigned regnum_t;
-
-/* Since offsets can go either forwards or backwards, this type needs to
- * be able to hold values from -(MAX_BUF_SIZE - 1) to MAX_BUF_SIZE - 1.
- */
-typedef int pattern_offset_t;
-
-typedef struct
-{
-  struct rexp_node ** top_expression; /* was begalt */
-  struct rexp_node ** last_expression; /* was laststart */
-  pattern_offset_t inner_group_offset;
-  regnum_t regnum;
-} compile_stack_elt_t;
-
-typedef struct
-{
-  compile_stack_elt_t *stack;
-  unsigned size;
-  unsigned avail;			/* Offset of next open position.  */
-} compile_stack_type;
-
-
-#define INIT_COMPILE_STACK_SIZE 32
-
-#define COMPILE_STACK_EMPTY  (compile_stack.avail == 0)
-#define COMPILE_STACK_FULL  (compile_stack.avail == compile_stack.size)
-
-/* The next available element.  */
-#define COMPILE_STACK_TOP (compile_stack.stack[compile_stack.avail])
-
-
-/* Set the bit for character C in a list.  */
-#define SET_LIST_BIT(c)                               \
-  (b[((unsigned char) (c)) / CHARBITS]               \
-   |= 1 << (((unsigned char) c) % CHARBITS))
-
-/* Get the next unsigned number in the uncompiled pattern.  */
-#define GET_UNSIGNED_NUMBER(num) 					\
-  { if (p != pend)							\
-     {									\
-       PATFETCH (c); 							\
-       while (isdigit (c)) 						\
-         { 								\
-           if (num < 0)							\
-              num = 0;							\
-           num = num * 10 + c - '0'; 					\
-           if (p == pend) 						\
-              break; 							\
-           PATFETCH (c);						\
-         } 								\
-       } 								\
-    }
-
-#define CHAR_CLASS_MAX_LENGTH  6 /* Namely, `xdigit'.  */
-
-#define IS_CHAR_CLASS(string)						\
-   (!strcmp (string, "alpha") || !strcmp (string, "upper")		\
-    || !strcmp (string, "lower") || !strcmp (string, "digit")		\
-    || !strcmp (string, "alnum") || !strcmp (string, "xdigit")		\
-    || !strcmp (string, "space") || !strcmp (string, "print")		\
-    || !strcmp (string, "punct") || !strcmp (string, "graph")		\
-    || !strcmp (string, "cntrl") || !strcmp (string, "blank"))
-
-
-/* These predicates are used in regex_compile. */
-
-/* P points to just after a ^ in PATTERN.  Return true if that ^ comes
- * after an alternative or a begin-subexpression.  We assume there is at
- * least one character before the ^.
- */
-
-#ifdef __STDC__
-static boolean
-at_begline_loc_p (__const__ char *pattern, __const__ char * p, reg_syntax_t syntax)
-#else
-static boolean
-at_begline_loc_p (pattern, p, syntax)
-     __const__ char *pattern;
-     __const__ char * p;
-     reg_syntax_t syntax;
-#endif
-{
-  __const__ char *prev = p - 2;
-  boolean prev_prev_backslash = ((prev > pattern) && (prev[-1] == '\\'));
-
-    return
-
-      (/* After a subexpression?  */
-       ((*prev == '(') && ((syntax & RE_NO_BK_PARENS) || prev_prev_backslash))
-       ||
-       /* After an alternative?  */
-       ((*prev == '|') && ((syntax & RE_NO_BK_VBAR) || prev_prev_backslash))
-       );
-}
-
-/* The dual of at_begline_loc_p.  This one is for $.  We assume there is
- * at least one character after the $, i.e., `P < PEND'.
- */
-
-#ifdef __STDC__
-static boolean
-at_endline_loc_p (__const__ char *p, __const__ char *pend, int syntax)
-#else
-static boolean
-at_endline_loc_p (p, pend, syntax)
-     __const__ char *p;
-     __const__ char *pend;
-     int syntax;
-#endif
-{
-  __const__ char *next = p;
-  boolean next_backslash = (*next == '\\');
-  __const__ char *next_next = (p + 1 < pend) ? (p + 1) : 0;
-
-  return
-    (
-     /* Before a subexpression?  */
-     ((syntax & RE_NO_BK_PARENS)
-      ? (*next == ')')
-      : (next_backslash && next_next && (*next_next == ')')))
-    ||
-     /* Before an alternative?  */
-     ((syntax & RE_NO_BK_VBAR)
-      ? (*next == '|')
-      : (next_backslash && next_next && (*next_next == '|')))
-     );
-}
-
-
-unsigned char rx_id_translation[256] =
-{
-  0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
- 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
- 20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
- 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
- 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
- 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
- 60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
- 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
- 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
- 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
-
- 100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
- 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
- 120, 121, 122, 123, 124, 125, 126, 127, 128, 129,
- 130, 131, 132, 133, 134, 135, 136, 137, 138, 139,
- 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
- 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
- 160, 161, 162, 163, 164, 165, 166, 167, 168, 169,
- 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
- 180, 181, 182, 183, 184, 185, 186, 187, 188, 189,
- 190, 191, 192, 193, 194, 195, 196, 197, 198, 199,
-
- 200, 201, 202, 203, 204, 205, 206, 207, 208, 209,
- 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
- 220, 221, 222, 223, 224, 225, 226, 227, 228, 229,
- 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
- 240, 241, 242, 243, 244, 245, 246, 247, 248, 249,
- 250, 251, 252, 253, 254, 255
-};
-
-/* The compiler keeps an inverted translation table.
- * This looks up/inititalize elements.
- * VALID is an array of booleans that validate CACHE.
- */
-
-#ifdef __STDC__
-static rx_Bitset
-inverse_translation (struct re_pattern_buffer * rxb,
-		     char * valid, rx_Bitset cache,
-		     unsigned char * translate, int c)
-#else
-static rx_Bitset
-inverse_translation (rxb, valid, cache, translate, c)
-     struct re_pattern_buffer * rxb;
-     char * valid;
-     rx_Bitset cache;
-     unsigned char * translate;
-     int c;
-#endif
-{
-  rx_Bitset cs
-    = cache + c * rx_bitset_numb_subsets (rxb->rx.local_cset_size);
-
-  if (!valid[c])
-    {
-      int x;
-      int c_tr = TRANSLATE(c);
-      rx_bitset_null (rxb->rx.local_cset_size, cs);
-      for (x = 0; x < 256; ++x)	/* &&&& 13.37 */
-	if (TRANSLATE(x) == c_tr)
-	  RX_bitset_enjoin (cs, x);
-      valid[c] = 1;
-    }
-  return cs;
-}
-
-
-
-
-/* More subroutine declarations and macros for regex_compile.  */
-
-/* Returns true if REGNUM is in one of COMPILE_STACK's elements and
-   false if it's not.  */
-
-#ifdef __STDC__
-static boolean
-group_in_compile_stack (compile_stack_type compile_stack, regnum_t regnum)
-#else
-static boolean
-group_in_compile_stack (compile_stack, regnum)
-    compile_stack_type compile_stack;
-    regnum_t regnum;
-#endif
-{
-  int this_element;
-
-  for (this_element = compile_stack.avail - 1;
-       this_element >= 0;
-       this_element--)
-    if (compile_stack.stack[this_element].regnum == regnum)
-      return true;
-
-  return false;
-}
-
-
-/*
- * Read the ending character of a range (in a bracket expression) from the
- * uncompiled pattern *P_PTR (which ends at PEND).  We assume the
- * starting character is in `P[-2]'.  (`P[-1]' is the character `-'.)
- * Then we set the translation of all bits between the starting and
- * ending characters (inclusive) in the compiled pattern B.
- *
- * Return an error code.
- *
- * We use these short variable names so we can use the same macros as
- * `regex_compile' itself.
- */
-
-#ifdef __STDC__
-static reg_errcode_t
-compile_range (struct re_pattern_buffer * rxb, rx_Bitset cs,
-	       __const__ char ** p_ptr, __const__ char * pend,
-	       unsigned char * translate, reg_syntax_t syntax,
-	       rx_Bitset inv_tr,  char * valid_inv_tr)
-#else
-static reg_errcode_t
-compile_range (rxb, cs, p_ptr, pend, translate, syntax, inv_tr, valid_inv_tr)
-     struct re_pattern_buffer * rxb;
-     rx_Bitset cs;
-     __const__ char ** p_ptr;
-     __const__ char * pend;
-     unsigned char * translate;
-     reg_syntax_t syntax;
-     rx_Bitset inv_tr;
-     char * valid_inv_tr;
-#endif
-{
-  unsigned this_char;
-
-  __const__ char *p = *p_ptr;
-
-  unsigned char range_end;
-  unsigned char range_start = TRANSLATE(p[-2]);
-
-  if (p == pend)
-    return REG_ERANGE;
-
-  PATFETCH (range_end);
-
-  (*p_ptr)++;
-
-  if (range_start > range_end)
-    return syntax & RE_NO_EMPTY_RANGES ? REG_ERANGE : REG_NOERROR;
-
-  for (this_char = range_start; this_char <= range_end; this_char++)
-    {
-      rx_Bitset it =
-	inverse_translation (rxb, valid_inv_tr, inv_tr, translate, this_char);
-      rx_bitset_union (rxb->rx.local_cset_size, cs, it);
-    }
-
-  return REG_NOERROR;
-}
-
-
-/* This searches a regexp for backreference side effects.
- * It fills in the array OUT with 1 at the index of every register pair
- * referenced by a backreference.
- *
- * This is used to help optimize patterns for searching.  The information is
- * useful because, if the caller doesn't want register values, backreferenced
- * registers are the only registers for which we need rx_backtrack.
- */
-
-#ifdef __STDC__
-static void
-find_backrefs (char * out, struct rexp_node * rexp,
-	       struct re_se_params * params)
-#else
-static void
-find_backrefs (out, rexp, params)
-     char * out;
-     struct rexp_node * rexp;
-     struct re_se_params * params;
-#endif
-{
-  if (rexp)
-    switch (rexp->type)
-      {
-      case r_cset:
-      case r_data:
-	return;
-      case r_alternate:
-      case r_concat:
-      case r_opt:
-      case r_star:
-      case r_2phase_star:
-	find_backrefs (out, rexp->params.pair.left, params);
-	find_backrefs (out, rexp->params.pair.right, params);
-	return;
-      case r_side_effect:
-	if (   ((long)rexp->params.side_effect >= 0)
-	    && (params [(long)rexp->params.side_effect].se == re_se_backref))
-	  out[ params [(long)rexp->params.side_effect].op1] = 1;
-	return;
-      }
-}
-
-
-
-/* Returns 0 unless the pattern can match the empty string. */
-
-#ifdef __STDC__
-static int
-compute_fastset (struct re_pattern_buffer * rxb, struct rexp_node * rexp)
-#else
-static int
-compute_fastset (rxb, rexp)
-     struct re_pattern_buffer * rxb;
-     struct rexp_node * rexp;
-#endif
-{
-  if (!rexp)
-    return 1;
-  switch (rexp->type)
-    {
-    case r_data:
-      return 1;
-    case r_cset:
-      {
-	rx_bitset_union (rxb->rx.local_cset_size,
-			 rxb->fastset, rexp->params.cset);
-      }
-      return 0;
-    case r_concat:
-      return (compute_fastset (rxb, rexp->params.pair.left)
-	      && compute_fastset (rxb, rexp->params.pair.right));
-    case r_2phase_star:
-      compute_fastset (rxb, rexp->params.pair.left);
-      /* compute_fastset (rxb, rexp->params.pair.right);  nope... */
-      return 1;
-    case r_alternate:
-      return !!(compute_fastset (rxb, rexp->params.pair.left)
-		+ compute_fastset (rxb, rexp->params.pair.right));
-    case r_opt:
-    case r_star:
-      compute_fastset (rxb, rexp->params.pair.left);
-      return 1;
-    case r_side_effect:
-      return 1;
-    }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-/* returns
- *  1 -- yes, definately anchored by the given side effect.
- *  2 -- maybe anchored, maybe the empty string.
- *  0 -- definately not anchored
- *  There is simply no other possibility.
- */
-
-#ifdef __STDC__
-static int
-is_anchored (struct rexp_node * rexp, rx_side_effect se)
-#else
-static int
-is_anchored (rexp, se)
-     struct rexp_node * rexp;
-     rx_side_effect se;
-#endif
-{
-  if (!rexp)
-    return 2;
-  switch (rexp->type)
-    {
-    case r_cset:
-    case r_data:
-      return 0;
-    case r_concat:
-    case r_2phase_star:
-      {
-	int l = is_anchored (rexp->params.pair.left, se);
-	return (l == 2 ? is_anchored (rexp->params.pair.right, se) : l);
-      }
-    case r_alternate:
-      {
-	int l = is_anchored (rexp->params.pair.left, se);
-	int r = l ? is_anchored (rexp->params.pair.right, se) : 0;
-
-	if (l == r)
-	  return l;
-	else if ((l == 0) || (r == 0))
-	  return 0;
-	else
-	  return 2;
-      }
-    case r_opt:
-    case r_star:
-      return is_anchored (rexp->params.pair.left, se) ? 2 : 0;
-
-    case r_side_effect:
-      return ((rexp->params.side_effect == se)
-	      ? 1 : 2);
-    }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-/* This removes register assignments that aren't required by backreferencing.
- * This can speed up explore_future, especially if it eliminates
- * non-determinism in the superstate NFA.
- *
- * NEEDED is an array of characters, presumably filled in by FIND_BACKREFS.
- * The non-zero elements of the array indicate which register assignments
- * can NOT be removed from the expression.
- */
-
-#ifdef __STDC__
-static struct rexp_node *
-remove_unecessary_side_effects (struct rx * rx, char * needed,
-				struct rexp_node * rexp,
-				struct re_se_params * params)
-#else
-static struct rexp_node *
-remove_unecessary_side_effects (rx, needed, rexp, params)
-     struct rx * rx;
-     char * needed;
-     struct rexp_node * rexp;
-     struct re_se_params * params;
-#endif
-{
-  struct rexp_node * l;
-  struct rexp_node * r;
-  if (!rexp)
-    return 0;
-  else
-    switch (rexp->type)
-      {
-      case r_cset:
-      case r_data:
-	return rexp;
-      case r_alternate:
-      case r_concat:
-      case r_2phase_star:
-	l = remove_unecessary_side_effects (rx, needed,
-					    rexp->params.pair.left, params);
-	r = remove_unecessary_side_effects (rx, needed,
-					    rexp->params.pair.right, params);
-	if ((l && r) || (rexp->type != r_concat))
-	  {
-	    rexp->params.pair.left = l;
-	    rexp->params.pair.right = r;
-	    return rexp;
-	  }
-	else
-	  {
-	    rexp->params.pair.left = rexp->params.pair.right = 0;
-	    rx_free_rexp (rx, rexp);
-	    return l ? l : r;
-	  }
-      case r_opt:
-      case r_star:
-	l = remove_unecessary_side_effects (rx, needed,
-					    rexp->params.pair.left, params);
-	if (l)
-	  {
-	    rexp->params.pair.left = l;
-	    return rexp;
-	  }
-	else
-	  {
-	    rexp->params.pair.left = 0;
-	    rx_free_rexp (rx, rexp);
-	    return 0;
-	  }
-      case r_side_effect:
-	{
-	  int se = (long)rexp->params.side_effect;
-	  if (   (se >= 0)
-	      && (   ((enum re_side_effects)params[se].se == re_se_lparen)
-		  || ((enum re_side_effects)params[se].se == re_se_rparen))
-	      && (params [se].op1 > 0)
-	      && (!needed [params [se].op1]))
-	    {
-	      rx_free_rexp (rx, rexp);
-	      return 0;
-	    }
-	  else
-	    return rexp;
-	}
-      }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-
-#ifdef __STDC__
-static int
-pointless_if_repeated (struct rexp_node * node, struct re_se_params * params)
-#else
-static int
-pointless_if_repeated (node, params)
-     struct rexp_node * node;
-     struct re_se_params * params;
-#endif
-{
-  if (!node)
-    return 1;
-  switch (node->type)
-    {
-    case r_cset:
-      return 0;
-    case r_alternate:
-    case r_concat:
-    case r_2phase_star:
-      return (pointless_if_repeated (node->params.pair.left, params)
-	      && pointless_if_repeated (node->params.pair.right, params));
-    case r_opt:
-    case r_star:
-      return pointless_if_repeated (node->params.pair.left, params);
-    case r_side_effect:
-      switch (((long)node->params.side_effect < 0)
-	      ? (enum re_side_effects)node->params.side_effect
-	      : (enum re_side_effects)params[(long)node->params.side_effect].se)
-	{
-	case re_se_try:
-	case re_se_at_dot:
-	case re_se_begbuf:
-	case re_se_hat:
-	case re_se_wordbeg:
-	case re_se_wordbound:
-	case re_se_notwordbound:
-	case re_se_wordend:
-	case re_se_endbuf:
-	case re_se_dollar:
-	case re_se_fail:
-	case re_se_win:
-	  return 1;
-	case re_se_lparen:
-	case re_se_rparen:
-	case re_se_iter:
-	case re_se_end_iter:
-	case re_se_syntax:
-	case re_se_not_syntax:
-	case re_se_backref:
-	  return 0;
-	}
-    case r_data:
-    default:
-      return 0;
-    }
-}
-
-
-
-#ifdef __STDC__
-static int
-registers_on_stack (struct re_pattern_buffer * rxb,
-		    struct rexp_node * rexp, int in_danger,
-		    struct re_se_params * params)
-#else
-static int
-registers_on_stack (rxb, rexp, in_danger, params)
-     struct re_pattern_buffer * rxb;
-     struct rexp_node * rexp;
-     int in_danger;
-     struct re_se_params * params;
-#endif
-{
-  if (!rexp)
-    return 0;
-  else
-    switch (rexp->type)
-      {
-      case r_cset:
-      case r_data:
-	return 0;
-      case r_alternate:
-      case r_concat:
-	return (   registers_on_stack (rxb, rexp->params.pair.left,
-				       in_danger, params)
-		|| (registers_on_stack
-		    (rxb, rexp->params.pair.right,
-		     in_danger, params)));
-      case r_opt:
-	return registers_on_stack (rxb, rexp->params.pair.left, 0, params);
-      case r_star:
-	return registers_on_stack (rxb, rexp->params.pair.left, 1, params);
-      case r_2phase_star:
-	return
-	  (   registers_on_stack (rxb, rexp->params.pair.left, 1, params)
-	   || registers_on_stack (rxb, rexp->params.pair.right, 1, params));
-      case r_side_effect:
-	{
-	  int se = (long)rexp->params.side_effect;
-	  if (   in_danger
-	      && (se >= 0)
-	      && (params [se].op1 > 0)
-	      && (   ((enum re_side_effects)params[se].se == re_se_lparen)
-		  || ((enum re_side_effects)params[se].se == re_se_rparen)))
-	    return 1;
-	  else
-	    return 0;
-	}
-      }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-
-static char idempotent_complex_se[] =
-{
-#define RX_WANT_SE_DEFS 1
-#undef RX_DEF_SE
-#undef RX_DEF_CPLX_SE
-#define RX_DEF_SE(IDEM, NAME, VALUE)
-#define RX_DEF_CPLX_SE(IDEM, NAME, VALUE)     IDEM,
-#include "rx.h"
-#undef RX_DEF_SE
-#undef RX_DEF_CPLX_SE
-#undef RX_WANT_SE_DEFS
-  23
-};
-
-static char idempotent_se[] =
-{
-  13,
-#define RX_WANT_SE_DEFS 1
-#undef RX_DEF_SE
-#undef RX_DEF_CPLX_SE
-#define RX_DEF_SE(IDEM, NAME, VALUE)	      IDEM,
-#define RX_DEF_CPLX_SE(IDEM, NAME, VALUE)
-#include "rx.h"
-#undef RX_DEF_SE
-#undef RX_DEF_CPLX_SE
-#undef RX_WANT_SE_DEFS
-  42
-};
-
-
-
-
-#ifdef __STDC__
-static int
-has_any_se (struct rx * rx,
-	    struct rexp_node * rexp)
-#else
-static int
-has_any_se (rx, rexp)
-     struct rx * rx;
-     struct rexp_node * rexp;
-#endif
-{
-  if (!rexp)
-    return 0;
-
-  switch (rexp->type)
-    {
-    case r_cset:
-    case r_data:
-      return 0;
-
-    case r_side_effect:
-      return 1;
-
-    case r_2phase_star:
-    case r_concat:
-    case r_alternate:
-      return
-	(   has_any_se (rx, rexp->params.pair.left)
-	 || has_any_se (rx, rexp->params.pair.right));
-
-    case r_opt:
-    case r_star:
-      return has_any_se (rx, rexp->params.pair.left);
-    }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-
-/* This must be called AFTER `convert_hard_loops' for a given REXP. */
-#ifdef __STDC__
-static int
-has_non_idempotent_epsilon_path (struct rx * rx,
-				 struct rexp_node * rexp,
-				 struct re_se_params * params)
-#else
-static int
-has_non_idempotent_epsilon_path (rx, rexp, params)
-     struct rx * rx;
-     struct rexp_node * rexp;
-     struct re_se_params * params;
-#endif
-{
-  if (!rexp)
-    return 0;
-
-  switch (rexp->type)
-    {
-    case r_cset:
-    case r_data:
-    case r_star:
-      return 0;
-
-    case r_side_effect:
-      return
-	!((long)rexp->params.side_effect > 0
-	  ? idempotent_complex_se [ params [(long)rexp->params.side_effect].se ]
-	  : idempotent_se [-(long)rexp->params.side_effect]);
-
-    case r_alternate:
-      return
-	(   has_non_idempotent_epsilon_path (rx,
-					     rexp->params.pair.left, params)
-	 || has_non_idempotent_epsilon_path (rx,
-					     rexp->params.pair.right, params));
-
-    case r_2phase_star:
-    case r_concat:
-      return
-	(   has_non_idempotent_epsilon_path (rx,
-					     rexp->params.pair.left, params)
-	 && has_non_idempotent_epsilon_path (rx,
-					     rexp->params.pair.right, params));
-
-    case r_opt:
-      return has_non_idempotent_epsilon_path (rx,
-					      rexp->params.pair.left, params);
-    }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-
-/* This computes rougly what it's name suggests.   It can (and does) go wrong
- * in the direction of returning spurious 0 without causing disasters.
- */
-#ifdef __STDC__
-static int
-begins_with_complex_se (struct rx * rx, struct rexp_node * rexp)
-#else
-static int
-begins_with_complex_se (rx, rexp)
-     struct rx * rx;
-     struct rexp_node * rexp;
-#endif
-{
-  if (!rexp)
-    return 0;
-
-  switch (rexp->type)
-    {
-    case r_cset:
-    case r_data:
-      return 0;
-
-    case r_side_effect:
-      return ((long)rexp->params.side_effect >= 0);
-
-    case r_alternate:
-      return
-	(   begins_with_complex_se (rx, rexp->params.pair.left)
-	 && begins_with_complex_se (rx, rexp->params.pair.right));
-
-
-    case r_concat:
-      return has_any_se (rx, rexp->params.pair.left);
-    case r_opt:
-    case r_star:
-    case r_2phase_star:
-      return 0;
-    }
-
-  /* this should never happen */
-  return 0;
-}
-
-
-/* This destructively removes some of the re_se_tv side effects from
- * a rexp tree.  In particular, during parsing re_se_tv was inserted on the
- * right half of every | to guarantee that posix path preference could be
- * honored.  This function removes some which it can be determined aren't
- * needed.
- */
-
-#ifdef __STDC__
-static void
-speed_up_alt (struct rx * rx,
-	      struct rexp_node * rexp,
-	      int unposix)
-#else
-static void
-speed_up_alt (rx, rexp, unposix)
-     struct rx * rx;
-     struct rexp_node * rexp;
-     int unposix;
-#endif
-{
-  if (!rexp)
-    return;
-
-  switch (rexp->type)
-    {
-    case r_cset:
-    case r_data:
-    case r_side_effect:
-      return;
-
-    case r_opt:
-    case r_star:
-      speed_up_alt (rx, rexp->params.pair.left, unposix);
-      return;
-
-    case r_2phase_star:
-    case r_concat:
-      speed_up_alt (rx, rexp->params.pair.left, unposix);
-      speed_up_alt (rx, rexp->params.pair.right, unposix);
-      return;
-
-    case r_alternate:
-      /* the right child is guaranteed to be (concat re_se_tv <subexp>) */
-
-      speed_up_alt (rx, rexp->params.pair.left, unposix);
-      speed_up_alt (rx, rexp->params.pair.right->params.pair.right, unposix);
-
-      if (   unposix
-	  || (begins_with_complex_se
-	      (rx, rexp->params.pair.right->params.pair.right))
-	  || !(   has_any_se (rx, rexp->params.pair.right->params.pair.right)
-	       || has_any_se (rx, rexp->params.pair.left)))
-	{
-	  struct rexp_node * conc = rexp->params.pair.right;
-	  rexp->params.pair.right = conc->params.pair.right;
-	  conc->params.pair.right = 0;
-	  rx_free_rexp (rx, conc);
-	}
-    }
-}
-
-
-
-
-
-/* `regex_compile' compiles PATTERN (of length SIZE) according to SYNTAX.
-   Returns one of error codes defined in `regex.h', or zero for success.
-
-   Assumes the `allocated' (and perhaps `buffer') and `translate'
-   fields are set in BUFP on entry.
-
-   If it succeeds, results are put in BUFP (if it returns an error, the
-   contents of BUFP are undefined):
-     `buffer' is the compiled pattern;
-     `syntax' is set to SYNTAX;
-     `used' is set to the length of the compiled pattern;
-     `fastmap_accurate' is set to zero;
-     `re_nsub' is set to the number of groups in PATTERN;
-     `not_bol' and `not_eol' are set to zero.
-
-   The `fastmap' and `newline_anchor' fields are neither
-   examined nor set.  */
-
-
-
-#ifdef __STDC__
-RX_DECL reg_errcode_t
-rx_compile (__const__ char *pattern, int size,
-	    reg_syntax_t syntax,
-	    struct re_pattern_buffer * rxb)
-#else
-RX_DECL reg_errcode_t
-rx_compile (pattern, size, syntax, rxb)
-     __const__ char *pattern;
-     int size;
-     reg_syntax_t syntax;
-     struct re_pattern_buffer * rxb;
-#endif
-{
-  RX_subset
-    inverse_translate [CHAR_SET_SIZE * rx_bitset_numb_subsets(CHAR_SET_SIZE)];
-  char
-    validate_inv_tr [CHAR_SET_SIZE * rx_bitset_numb_subsets(CHAR_SET_SIZE)];
-
-  /* We fetch characters from PATTERN here.  Even though PATTERN is
-     `char *' (i.e., signed), we declare these variables as unsigned, so
-     they can be reliably used as array indices.  */
-  register unsigned char c, c1;
-
-  /* A random tempory spot in PATTERN.  */
-  __const__ char *p1;
-
-  /* Keeps track of unclosed groups.  */
-  compile_stack_type compile_stack;
-
-  /* Points to the current (ending) position in the pattern.  */
-  __const__ char *p = pattern;
-  __const__ char *pend = pattern + size;
-
-  /* How to translate the characters in the pattern.  */
-  unsigned char *translate = (rxb->translate
-			      ? rxb->translate
-			      : rx_id_translation);
-
-  /* When parsing is done, this will hold the expression tree. */
-  struct rexp_node * rexp = 0;
-
-  /* In the midst of compilation, this holds onto the regexp
-   * first parst while rexp goes on to aquire additional constructs.
-   */
-  struct rexp_node * orig_rexp = 0;
-  struct rexp_node * fewer_side_effects = 0;
-
-  /* This and top_expression are saved on the compile stack. */
-  struct rexp_node ** top_expression = &rexp;
-  struct rexp_node ** last_expression = top_expression;
-
-  /* Parameter to `goto append_node' */
-  struct rexp_node * append;
-
-  /* Counts open-groups as they are encountered.  This is the index of the
-   * innermost group being compiled.
-   */
-  regnum_t regnum = 0;
-
-  /* Place in the uncompiled pattern (i.e., the {) to
-   * which to go back if the interval is invalid.
-   */
-  __const__ char *beg_interval;
-
-  struct re_se_params * params = 0;
-  int paramc = 0;		/* How many complex side effects so far? */
-
-  rx_side_effect side;		/* param to `goto add_side_effect' */
-
-  bzero (validate_inv_tr, sizeof (validate_inv_tr));
-
-  rxb->rx.instruction_table = rx_id_instruction_table;
-
-
-  /* Initialize the compile stack.  */
-  compile_stack.stack =  (( compile_stack_elt_t *) malloc ((INIT_COMPILE_STACK_SIZE) * sizeof ( compile_stack_elt_t)));
-  if (compile_stack.stack == 0)
-    return REG_ESPACE;
-
-  compile_stack.size = INIT_COMPILE_STACK_SIZE;
-  compile_stack.avail = 0;
-
-  /* Initialize the pattern buffer.  */
-  rxb->rx.cache = &default_cache;
-  rxb->syntax = syntax;
-  rxb->fastmap_accurate = 0;
-  rxb->not_bol = rxb->not_eol = 0;
-  rxb->least_subs = 0;
-
-  /* Always count groups, whether or not rxb->no_sub is set.
-   * The whole pattern is implicitly group 0, so counting begins
-   * with 1.
-   */
-  rxb->re_nsub = 0;
-
-#if !defined (emacs) && !defined (SYNTAX)
-  /* Initialize the syntax table.  */
-   init_syntax_once ();
-#endif
-
-  /* Loop through the uncompiled pattern until we're at the end.  */
-  while (p != pend)
-    {
-      PATFETCH (c);
-
-      switch (c)
-        {
-        case '^':
-          {
-            if (   /* If at start of pattern, it's an operator.  */
-                   p == pattern + 1
-                   /* If context independent, it's an operator.  */
-                || syntax & RE_CONTEXT_INDEP_ANCHORS
-                   /* Otherwise, depends on what's come before.  */
-                || at_begline_loc_p (pattern, p, syntax))
-	      {
-		struct rexp_node * n
-		  = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)re_se_hat);
-		if (!n)
-		  return REG_ESPACE;
-		append = n;
-		goto append_node;
-	      }
-            else
-              goto normal_char;
-          }
-          break;
-
-
-        case '$':
-          {
-            if (   /* If at end of pattern, it's an operator.  */
-                   p == pend
-                   /* If context independent, it's an operator.  */
-                || syntax & RE_CONTEXT_INDEP_ANCHORS
-                   /* Otherwise, depends on what's next.  */
-                || at_endline_loc_p (p, pend, syntax))
-	      {
-		struct rexp_node * n
-		  = rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)re_se_dollar);
-		if (!n)
-		  return REG_ESPACE;
-		append = n;
-		goto append_node;
-	      }
-             else
-               goto normal_char;
-           }
-           break;
-
-
-	case '+':
-        case '?':
-          if ((syntax & RE_BK_PLUS_QM)
-              || (syntax & RE_LIMITED_OPS))
-            goto normal_char;
-
-        handle_plus:
-        case '*':
-          /* If there is no previous pattern... */
-          if (pointless_if_repeated (*last_expression, params))
-            {
-              if (syntax & RE_CONTEXT_INVALID_OPS)
-                return REG_BADRPT;
-              else if (!(syntax & RE_CONTEXT_INDEP_OPS))
-                goto normal_char;
-            }
-
-          {
-            /* 1 means zero (many) matches is allowed.  */
-            char zero_times_ok = 0, many_times_ok = 0;
-
-            /* If there is a sequence of repetition chars, collapse it
-               down to just one (the right one).  We can't combine
-               interval operators with these because of, e.g., `a{2}*',
-               which should only match an even number of `a's.  */
-
-            for (;;)
-              {
-                zero_times_ok |= c != '+';
-                many_times_ok |= c != '?';
-
-                if (p == pend)
-                  break;
-
-                PATFETCH (c);
-
-                if (c == '*'
-                    || (!(syntax & RE_BK_PLUS_QM) && (c == '+' || c == '?')))
-                  ;
-
-                else if (syntax & RE_BK_PLUS_QM  &&  c == '\\')
-                  {
-                    if (p == pend) return REG_EESCAPE;
-
-                    PATFETCH (c1);
-                    if (!(c1 == '+' || c1 == '?'))
-                      {
-                        PATUNFETCH;
-                        PATUNFETCH;
-                        break;
-                      }
-
-                    c = c1;
-                  }
-                else
-                  {
-                    PATUNFETCH;
-                    break;
-                  }
-
-                /* If we get here, we found another repeat character.  */
-               }
-
-            /* Star, etc. applied to an empty pattern is equivalent
-               to an empty pattern.  */
-            if (!last_expression)
-              break;
-
-	    /* Now we know whether or not zero matches is allowed
-	     * and also whether or not two or more matches is allowed.
-	     */
-
-	    {
-	      struct rexp_node * inner_exp = *last_expression;
-	      int need_sync = 0;
-
-	      if (many_times_ok
-		  && has_non_idempotent_epsilon_path (&rxb->rx,
-						      inner_exp, params))
-		{
-		  struct rexp_node * pusher
-		    = rx_mk_r_side_effect (&rxb->rx,
-					   (rx_side_effect)re_se_pushpos);
-		  struct rexp_node * checker
-		    = rx_mk_r_side_effect (&rxb->rx,
-					   (rx_side_effect)re_se_chkpos);
-		  struct rexp_node * pushback
-		    = rx_mk_r_side_effect (&rxb->rx,
-					   (rx_side_effect)re_se_pushback);
-		  rx_Bitset cs = rx_cset (&rxb->rx);
-		  struct rexp_node * lit_t = rx_mk_r_cset (&rxb->rx, cs);
-		  struct rexp_node * fake_state
-		    = rx_mk_r_concat (&rxb->rx, pushback, lit_t);
-		  struct rexp_node * phase2
-		    = rx_mk_r_concat (&rxb->rx, checker, fake_state);
-		  struct rexp_node * popper
-		    = rx_mk_r_side_effect (&rxb->rx,
-					   (rx_side_effect)re_se_poppos);
-		  struct rexp_node * star
-		    = rx_mk_r_2phase_star (&rxb->rx, inner_exp, phase2);
-		  struct rexp_node * a
-		    = rx_mk_r_concat (&rxb->rx, pusher, star);
-		  struct rexp_node * whole_thing
-		    = rx_mk_r_concat (&rxb->rx, a, popper);
-		  if (!(pusher && star && pushback && lit_t && fake_state
-			&& lit_t && phase2 && checker && popper
-			&& a && whole_thing))
-		    return REG_ESPACE;
-		  RX_bitset_enjoin (cs, 't');
-		  *last_expression = whole_thing;
-		}
-	      else
-		{
-		  struct rexp_node * star =
-		    (many_times_ok ? rx_mk_r_star : rx_mk_r_opt)
-		      (&rxb->rx, *last_expression);
-		  if (!star)
-		    return REG_ESPACE;
-		  *last_expression = star;
-		  need_sync = has_any_se (&rxb->rx, *last_expression);
-		}
-	      if (!zero_times_ok)
-		{
-		  struct rexp_node * concat
-		    = rx_mk_r_concat (&rxb->rx, inner_exp,
-				      rx_copy_rexp (&rxb->rx,
-						    *last_expression));
-		  if (!concat)
-		    return REG_ESPACE;
-		  *last_expression = concat;
-		}
-	      if (need_sync)
-		{
-		  int sync_se = paramc;
-		  params = (params
-			    ? ((struct re_se_params *)
-			       realloc (params,
-					sizeof (*params) * (1 + paramc)))
-			    : ((struct re_se_params *)
-			       malloc (sizeof (*params))));
-		  if (!params)
-		    return REG_ESPACE;
-		  ++paramc;
-		  params [sync_se].se = re_se_tv;
-		  side = (rx_side_effect)sync_se;
-		  goto add_side_effect;
-		}
-	    }
-	    /* The old regex.c used to optimize `.*\n'.
-	     * Maybe rx should too?
-	     */
-	  }
-	  break;
-
-
-	case '.':
-	  {
-	    rx_Bitset cs = rx_cset (&rxb->rx);
-	    struct rexp_node * n = rx_mk_r_cset (&rxb->rx, cs);
-	    if (!(cs && n))
-	      return REG_ESPACE;
-
-	    rx_bitset_universe (rxb->rx.local_cset_size, cs);
-	    if (!(rxb->syntax & RE_DOT_NEWLINE))
-	      RX_bitset_remove (cs, '\n');
-	    if (!(rxb->syntax & RE_DOT_NOT_NULL))
-	      RX_bitset_remove (cs, 0);
-
-	    append = n;
-	    goto append_node;
-	    break;
-	  }
-
-
-        case '[':
-	  if (p == pend) return REG_EBRACK;
-          {
-            boolean had_char_class = false;
-	    rx_Bitset cs = rx_cset (&rxb->rx);
-	    struct rexp_node * node = rx_mk_r_cset (&rxb->rx, cs);
-	    int is_inverted = *p == '^';
-
-	    if (!(node && cs))
-	      return REG_ESPACE;
-
-	    /* This branch of the switch is normally exited with
-	     *`goto append_node'
-	     */
-	    append = node;
-
-            if (is_inverted)
-	      p++;
-
-            /* Remember the first position in the bracket expression.  */
-            p1 = p;
-
-            /* Read in characters and ranges, setting map bits.  */
-            for (;;)
-              {
-                if (p == pend) return REG_EBRACK;
-
-                PATFETCH (c);
-
-                /* \ might escape characters inside [...] and [^...].  */
-                if ((syntax & RE_BACKSLASH_ESCAPE_IN_LISTS) && c == '\\')
-                  {
-                    if (p == pend) return REG_EESCAPE;
-
-                    PATFETCH (c1);
-		    {
-		      rx_Bitset it = inverse_translation (rxb,
-							  validate_inv_tr,
-							  inverse_translate,
-							  translate,
-							  c1);
-		      rx_bitset_union (rxb->rx.local_cset_size, cs, it);
-		    }
-                    continue;
-                  }
-
-                /* Could be the end of the bracket expression.  If it's
-                   not (i.e., when the bracket expression is `[]' so
-                   far), the ']' character bit gets set way below.  */
-                if (c == ']' && p != p1 + 1)
-                  goto finalize_class_and_append;
-
-                /* Look ahead to see if it's a range when the last thing
-                   was a character class.  */
-                if (had_char_class && c == '-' && *p != ']')
-                  return REG_ERANGE;
-
-                /* Look ahead to see if it's a range when the last thing
-                   was a character: if this is a hyphen not at the
-                   beginning or the end of a list, then it's the range
-                   operator.  */
-                if (c == '-'
-                    && !(p - 2 >= pattern && p[-2] == '[')
-                    && !(p - 3 >= pattern && p[-3] == '[' && p[-2] == '^')
-                    && *p != ']')
-                  {
-                    reg_errcode_t ret
-                      = compile_range (rxb, cs, &p, pend, translate, syntax,
-				       inverse_translate, validate_inv_tr);
-                    if (ret != REG_NOERROR) return ret;
-                  }
-
-                else if (p[0] == '-' && p[1] != ']')
-                  { /* This handles ranges made up of characters only.  */
-                    reg_errcode_t ret;
-
-		    /* Move past the `-'.  */
-                    PATFETCH (c1);
-
-                    ret = compile_range (rxb, cs, &p, pend, translate, syntax,
-					 inverse_translate, validate_inv_tr);
-                    if (ret != REG_NOERROR) return ret;
-                  }
-
-                /* See if we're at the beginning of a possible character
-                   class.  */
-
-		else if ((syntax & RE_CHAR_CLASSES)
-			 && (c == '[') && (*p == ':'))
-                  {
-                    char str[CHAR_CLASS_MAX_LENGTH + 1];
-
-                    PATFETCH (c);
-                    c1 = 0;
-
-                    /* If pattern is `[[:'.  */
-                    if (p == pend) return REG_EBRACK;
-
-                    for (;;)
-                      {
-                        PATFETCH (c);
-                        if (c == ':' || c == ']' || p == pend
-                            || c1 == CHAR_CLASS_MAX_LENGTH)
-			  break;
-                        str[c1++] = c;
-                      }
-                    str[c1] = '\0';
-
-                    /* If isn't a word bracketed by `[:' and:`]':
-                       undo the ending character, the letters, and leave
-                       the leading `:' and `[' (but set bits for them).  */
-                    if (c == ':' && *p == ']')
-                      {
-                        int ch;
-                        boolean is_alnum = !strcmp (str, "alnum");
-                        boolean is_alpha = !strcmp (str, "alpha");
-                        boolean is_blank = !strcmp (str, "blank");
-                        boolean is_cntrl = !strcmp (str, "cntrl");
-                        boolean is_digit = !strcmp (str, "digit");
-                        boolean is_graph = !strcmp (str, "graph");
-                        boolean is_lower = !strcmp (str, "lower");
-                        boolean is_print = !strcmp (str, "print");
-                        boolean is_punct = !strcmp (str, "punct");
-                        boolean is_space = !strcmp (str, "space");
-                        boolean is_upper = !strcmp (str, "upper");
-                        boolean is_xdigit = !strcmp (str, "xdigit");
-
-                        if (!IS_CHAR_CLASS (str)) return REG_ECTYPE;
-
-                        /* Throw away the ] at the end of the character
-                           class.  */
-                        PATFETCH (c);
-
-                        if (p == pend) return REG_EBRACK;
-
-                        for (ch = 0; ch < 1 << CHARBITS; ch++)
-                          {
-                            if (   (is_alnum  && isalnum (ch))
-                                || (is_alpha  && isalpha (ch))
-                                || (is_blank  && isblank (ch))
-                                || (is_cntrl  && iscntrl (ch))
-                                || (is_digit  && isdigit (ch))
-                                || (is_graph  && isgraph (ch))
-                                || (is_lower  && islower (ch))
-                                || (is_print  && isprint (ch))
-                                || (is_punct  && ispunct (ch))
-                                || (is_space  && isspace (ch))
-                                || (is_upper  && isupper (ch))
-                                || (is_xdigit && isxdigit (ch)))
-			      {
-				rx_Bitset it =
-				  inverse_translation (rxb,
-						       validate_inv_tr,
-						       inverse_translate,
-						       translate,
-						       ch);
-				rx_bitset_union (rxb->rx.local_cset_size,
-						 cs, it);
-			      }
-                          }
-                        had_char_class = true;
-                      }
-                    else
-                      {
-                        c1++;
-                        while (c1--)
-                          PATUNFETCH;
-			{
-			  rx_Bitset it =
-			    inverse_translation (rxb,
-						 validate_inv_tr,
-						 inverse_translate,
-						 translate,
-						 '[');
-			  rx_bitset_union (rxb->rx.local_cset_size,
-					   cs, it);
-			}
-			{
-			  rx_Bitset it =
-			    inverse_translation (rxb,
-						 validate_inv_tr,
-						 inverse_translate,
-						 translate,
-						 ':');
-			  rx_bitset_union (rxb->rx.local_cset_size,
-					   cs, it);
-			}
-                        had_char_class = false;
-                      }
-                  }
-                else
-                  {
-                    had_char_class = false;
-		    {
-		      rx_Bitset it = inverse_translation (rxb,
-							  validate_inv_tr,
-							  inverse_translate,
-							  translate,
-							  c);
-		      rx_bitset_union (rxb->rx.local_cset_size, cs, it);
-		    }
-                  }
-              }
-
-	  finalize_class_and_append:
-	    if (is_inverted)
-	      {
-		rx_bitset_complement (rxb->rx.local_cset_size, cs);
-		if (syntax & RE_HAT_LISTS_NOT_NEWLINE)
-		  RX_bitset_remove (cs, '\n');
-	      }
-	    goto append_node;
-          }
-          break;
-
-
-	case '(':
-          if (syntax & RE_NO_BK_PARENS)
-            goto handle_open;
-          else
-            goto normal_char;
-
-
-        case ')':
-          if (syntax & RE_NO_BK_PARENS)
-            goto handle_close;
-          else
-            goto normal_char;
-
-
-        case '\n':
-          if (syntax & RE_NEWLINE_ALT)
-            goto handle_alt;
-          else
-            goto normal_char;
-
-
-	case '|':
-          if (syntax & RE_NO_BK_VBAR)
-            goto handle_alt;
-          else
-            goto normal_char;
-
-
-        case '{':
-	  if ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
-	    goto handle_interval;
-	  else
-	    goto normal_char;
-
-
-        case '\\':
-          if (p == pend) return REG_EESCAPE;
-
-          /* Do not translate the character after the \, so that we can
-             distinguish, e.g., \B from \b, even if we normally would
-             translate, e.g., B to b.  */
-          PATFETCH_RAW (c);
-
-          switch (c)
-            {
-            case '(':
-              if (syntax & RE_NO_BK_PARENS)
-                goto normal_backslash;
-
-            handle_open:
-              rxb->re_nsub++;
-              regnum++;
-              if (COMPILE_STACK_FULL)
-                {
-                  ((compile_stack.stack) =
-		   (compile_stack_elt_t *) realloc (compile_stack.stack, ( compile_stack.size << 1) * sizeof (
-													      compile_stack_elt_t)));
-                  if (compile_stack.stack == 0) return REG_ESPACE;
-
-                  compile_stack.size <<= 1;
-                }
-
-	      if (*last_expression)
-		{
-		  struct rexp_node * concat
-		    = rx_mk_r_concat (&rxb->rx, *last_expression, 0);
-		  if (!concat)
-		    return REG_ESPACE;
-		  *last_expression = concat;
-		  last_expression = &concat->params.pair.right;
-		}
-
-              /*
-	       * These are the values to restore when we hit end of this
-               * group.
-	       */
-	      COMPILE_STACK_TOP.top_expression = top_expression;
-	      COMPILE_STACK_TOP.last_expression = last_expression;
-              COMPILE_STACK_TOP.regnum = regnum;
-
-              compile_stack.avail++;
-
-	      top_expression = last_expression;
-	      break;
-
-
-            case ')':
-              if (syntax & RE_NO_BK_PARENS) goto normal_backslash;
-
-            handle_close:
-              /* See similar code for backslashed left paren above.  */
-              if (COMPILE_STACK_EMPTY)
-                if (syntax & RE_UNMATCHED_RIGHT_PAREN_ORD)
-                  goto normal_char;
-                else
-                  return REG_ERPAREN;
-
-              /* Since we just checked for an empty stack above, this
-                 ``can't happen''.  */
-
-              {
-                /* We don't just want to restore into `regnum', because
-                   later groups should continue to be numbered higher,
-                   as in `(ab)c(de)' -- the second group is #2.  */
-                regnum_t this_group_regnum;
-		struct rexp_node ** inner = top_expression;
-
-                compile_stack.avail--;
-		top_expression = COMPILE_STACK_TOP.top_expression;
-		last_expression = COMPILE_STACK_TOP.last_expression;
-                this_group_regnum = COMPILE_STACK_TOP.regnum;
-		{
-		  int left_se = paramc;
-		  int right_se = paramc + 1;
-
-		  params = (params
-			    ? ((struct re_se_params *)
-			       realloc (params,
-					(paramc + 2) * sizeof (params[0])))
-			    : ((struct re_se_params *)
-			       malloc (2 * sizeof (params[0]))));
-		  if (!params)
-		    return REG_ESPACE;
-		  paramc += 2;
-
-		  params[left_se].se = re_se_lparen;
-		  params[left_se].op1 = this_group_regnum;
-		  params[right_se].se = re_se_rparen;
-		  params[right_se].op1 = this_group_regnum;
-		  {
-		    struct rexp_node * left
-		      = rx_mk_r_side_effect (&rxb->rx,
-					     (rx_side_effect)left_se);
-		    struct rexp_node * right
-		      = rx_mk_r_side_effect (&rxb->rx,
-					     (rx_side_effect)right_se);
-		    struct rexp_node * c1
-		      = (*inner
-			 ? rx_mk_r_concat (&rxb->rx, left, *inner) : left);
-		    struct rexp_node * c2
-		      = rx_mk_r_concat (&rxb->rx, c1, right);
-		    if (!(left && right && c1 && c2))
-		      return REG_ESPACE;
-		    *inner = c2;
-		  }
-		}
-		break;
-	      }
-
-            case '|':					/* `\|'.  */
-              if ((syntax & RE_LIMITED_OPS) || (syntax & RE_NO_BK_VBAR))
-                goto normal_backslash;
-            handle_alt:
-              if (syntax & RE_LIMITED_OPS)
-                goto normal_char;
-
-	      {
-		struct rexp_node * alt
-		  = rx_mk_r_alternate (&rxb->rx, *top_expression, 0);
-		if (!alt)
-		  return REG_ESPACE;
-		*top_expression = alt;
-		last_expression = &alt->params.pair.right;
-		{
-		  int sync_se = paramc;
-
-		  params = (params
-			    ? ((struct re_se_params *)
-			       realloc (params,
-					(paramc + 1) * sizeof (params[0])))
-			    : ((struct re_se_params *)
-			       malloc (sizeof (params[0]))));
-		  if (!params)
-		    return REG_ESPACE;
-		  ++paramc;
-
-		  params[sync_se].se = re_se_tv;
-		  {
-		    struct rexp_node * sync
-		      = rx_mk_r_side_effect (&rxb->rx,
-					     (rx_side_effect)sync_se);
-		    struct rexp_node * conc
-		      = rx_mk_r_concat (&rxb->rx, sync, 0);
-
-		    if (!sync || !conc)
-		      return REG_ESPACE;
-
-		    *last_expression = conc;
-		    last_expression = &conc->params.pair.right;
-		  }
-		}
-	      }
-              break;
-
-
-            case '{':
-              /* If \{ is a literal.  */
-              if (!(syntax & RE_INTERVALS)
-                     /* If we're at `\{' and it's not the open-interval
-                        operator.  */
-                  || ((syntax & RE_INTERVALS) && (syntax & RE_NO_BK_BRACES))
-                  || (p - 2 == pattern  &&  p == pend))
-                goto normal_backslash;
-
-            handle_interval:
-              {
-                /* If got here, then the syntax allows intervals.  */
-
-                /* At least (most) this many matches must be made.  */
-                int lower_bound = -1, upper_bound = -1;
-
-                beg_interval = p - 1;
-
-                if (p == pend)
-                  {
-                    if (syntax & RE_NO_BK_BRACES)
-                      goto unfetch_interval;
-                    else
-                      return REG_EBRACE;
-                  }
-
-                GET_UNSIGNED_NUMBER (lower_bound);
-
-                if (c == ',')
-                  {
-                    GET_UNSIGNED_NUMBER (upper_bound);
-                    if (upper_bound < 0) upper_bound = RE_DUP_MAX;
-                  }
-                else
-                  /* Interval such as `{1}' => match exactly once. */
-                  upper_bound = lower_bound;
-
-                if (lower_bound < 0 || upper_bound > RE_DUP_MAX
-                    || lower_bound > upper_bound)
-                  {
-                    if (syntax & RE_NO_BK_BRACES)
-                      goto unfetch_interval;
-                    else
-                      return REG_BADBR;
-                  }
-
-                if (!(syntax & RE_NO_BK_BRACES))
-                  {
-                    if (c != '\\') return REG_EBRACE;
-                    PATFETCH (c);
-                  }
-
-                if (c != '}')
-                  {
-                    if (syntax & RE_NO_BK_BRACES)
-                      goto unfetch_interval;
-                    else
-                      return REG_BADBR;
-                  }
-
-                /* We just parsed a valid interval.  */
-
-                /* If it's invalid to have no preceding re.  */
-                if (pointless_if_repeated (*last_expression, params))
-                  {
-                    if (syntax & RE_CONTEXT_INVALID_OPS)
-                      return REG_BADRPT;
-                    else if (!(syntax & RE_CONTEXT_INDEP_OPS))
-                      goto unfetch_interval;
-		    /* was: else laststart = b; */
-                  }
-
-                /* If the upper bound is zero, don't want to iterate
-                 * at all.
-		 */
-                 if (upper_bound == 0)
-		   {
-		     if (*last_expression)
-		       {
-			 rx_free_rexp (&rxb->rx, *last_expression);
-			 *last_expression = 0;
-		       }
-		   }
-		else
-		  /* Otherwise, we have a nontrivial interval. */
-		  {
-		    int iter_se = paramc;
-		    int end_se = paramc + 1;
-		    params = (params
-			      ? ((struct re_se_params *)
-				 realloc (params,
-					  sizeof (*params) * (2 + paramc)))
-			      : ((struct re_se_params *)
-				 malloc (2 * sizeof (*params))));
-		    if (!params)
-		      return REG_ESPACE;
-		    paramc += 2;
-		    params [iter_se].se = re_se_iter;
-		    params [iter_se].op1 = lower_bound;
-		    params[iter_se].op2 = upper_bound;
-
-		    params[end_se].se = re_se_end_iter;
-		    params[end_se].op1 = lower_bound;
-		    params[end_se].op2 = upper_bound;
-		    {
-		      struct rexp_node * push0
-			= rx_mk_r_side_effect (&rxb->rx,
-					       (rx_side_effect)re_se_push0);
-		      struct rexp_node * start_one_iter
-			= rx_mk_r_side_effect (&rxb->rx,
-					       (rx_side_effect)iter_se);
-		      struct rexp_node * phase1
-			= rx_mk_r_concat (&rxb->rx, start_one_iter,
-					  *last_expression);
-		      struct rexp_node * pushback
-			= rx_mk_r_side_effect (&rxb->rx,
-					       (rx_side_effect)re_se_pushback);
-		      rx_Bitset cs = rx_cset (&rxb->rx);
-		      struct rexp_node * lit_t
-			= rx_mk_r_cset (&rxb->rx, cs);
-		      struct rexp_node * phase2
-			= rx_mk_r_concat (&rxb->rx, pushback, lit_t);
-		      struct rexp_node * loop
-			= rx_mk_r_2phase_star (&rxb->rx, phase1, phase2);
-		      struct rexp_node * push_n_loop
-			= rx_mk_r_concat (&rxb->rx, push0, loop);
-		      struct rexp_node * final_test
-			= rx_mk_r_side_effect (&rxb->rx,
-					       (rx_side_effect)end_se);
-		      struct rexp_node * full_exp
-			= rx_mk_r_concat (&rxb->rx, push_n_loop, final_test);
-
-		      if (!(push0 && start_one_iter && phase1
-			    && pushback && lit_t && phase2
-			    && loop && push_n_loop && final_test && full_exp))
-			return REG_ESPACE;
-
-		      RX_bitset_enjoin(cs, 't');
-
-		      *last_expression = full_exp;
-		    }
-		  }
-                beg_interval = 0;
-              }
-              break;
-
-            unfetch_interval:
-              /* If an invalid interval, match the characters as literals.  */
-               p = beg_interval;
-               beg_interval = 0;
-
-               /* normal_char and normal_backslash need `c'.  */
-               PATFETCH (c);
-
-               if (!(syntax & RE_NO_BK_BRACES))
-                 {
-                   if (p > pattern  &&  p[-1] == '\\')
-                     goto normal_backslash;
-                 }
-               goto normal_char;
-
-#ifdef emacs
-            /* There is no way to specify the before_dot and after_dot
-               operators.  rms says this is ok.  --karl  */
-            case '=':
-	      side = (rx_side_effect)rx_se_at_dot;
-	      goto add_side_effect;
-              break;
-
-            case 's':
-	    case 'S':
-	      {
-		rx_Bitset cs = rx_cset (&rxb->rx);
-		struct rexp_node * set = rx_mk_r_cset (&rxb->rx, cs);
-		if (!(cs && set))
-		  return REG_ESPACE;
-		if (c == 'S')
-		  rx_bitset_universe (rxb->rx.local_cset_size, cs);
-
-		PATFETCH (c);
-		{
-		  int x;
-		  enum syntaxcode code = syntax_spec_code [c];
-		  for (x = 0; x < 256; ++x)
-		    {
-
-		      if (SYNTAX (x) == code)
-			{
-			  rx_Bitset it =
-			    inverse_translation (rxb, validate_inv_tr,
-						 inverse_translate,
-						 translate, x);
-			  rx_bitset_xor (rxb->rx.local_cset_size, cs, it);
-			}
-		    }
-		}
-		append = set;
-		goto append_node;
-	      }
-              break;
-#endif /* emacs */
-
-
-            case 'w':
-            case 'W':
-	      {
-		rx_Bitset cs = rx_cset (&rxb->rx);
-		struct rexp_node * n = (cs ? rx_mk_r_cset (&rxb->rx, cs) : 0);
-		if (!(cs && n))
-		  return REG_ESPACE;
-		if (c == 'W')
-		  rx_bitset_universe (rxb->rx.local_cset_size ,cs);
-		{
-		  int x;
-		  for (x = rxb->rx.local_cset_size - 1; x > 0; --x)
-		    if (SYNTAX(x) & Sword)
-		      RX_bitset_toggle (cs, x);
-		}
-		append = n;
-		goto append_node;
-	      }
-              break;
-
-/* With a little extra work, some of these side effects could be optimized
- * away (basicly by looking at what we already know about the surrounding
- * chars).
- */
-            case '<':
-	      side = (rx_side_effect)re_se_wordbeg;
-	      goto add_side_effect;
-              break;
-
-            case '>':
-              side = (rx_side_effect)re_se_wordend;
-	      goto add_side_effect;
-              break;
-
-            case 'b':
-              side = (rx_side_effect)re_se_wordbound;
-	      goto add_side_effect;
-              break;
-
-            case 'B':
-              side = (rx_side_effect)re_se_notwordbound;
-	      goto add_side_effect;
-              break;
-
-            case '`':
-	      side = (rx_side_effect)re_se_begbuf;
-	      goto add_side_effect;
-	      break;
-
-            case '\'':
-	      side = (rx_side_effect)re_se_endbuf;
-	      goto add_side_effect;
-              break;
-
-	    add_side_effect:
-	      {
-		struct rexp_node * se
-		  = rx_mk_r_side_effect (&rxb->rx, side);
-		if (!se)
-		  return REG_ESPACE;
-		append = se;
-		goto append_node;
-	      }
-	      break;
-
-            case '1': case '2': case '3': case '4': case '5':
-            case '6': case '7': case '8': case '9':
-              if (syntax & RE_NO_BK_REFS)
-                goto normal_char;
-
-              c1 = c - '0';
-
-              if (c1 > regnum)
-                return REG_ESUBREG;
-
-              /* Can't back reference to a subexpression if inside of it.  */
-              if (group_in_compile_stack (compile_stack, c1))
-		return REG_ESUBREG;
-
-	      {
-		int backref_se = paramc;
-		params = (params
-			  ? ((struct re_se_params *)
-			     realloc (params,
-				      sizeof (*params) * (1 + paramc)))
-			  : ((struct re_se_params *)
-			     malloc (sizeof (*params))));
-		if (!params)
-		  return REG_ESPACE;
-		++paramc;
-		params[backref_se].se = re_se_backref;
-		params[backref_se].op1 = c1;
-		side = (rx_side_effect)backref_se;
-		goto add_side_effect;
-	      }
-              break;
-
-            case '+':
-            case '?':
-              if (syntax & RE_BK_PLUS_QM)
-                goto handle_plus;
-              else
-                goto normal_backslash;
-
-            default:
-            normal_backslash:
-              /* You might think it would be useful for \ to mean
-                 not to translate; but if we don't translate it
-                 it will never match anything.  */
-              c = TRANSLATE (c);
-              goto normal_char;
-            }
-          break;
-
-
-	default:
-        /* Expects the character in `c'.  */
-	normal_char:
-	    {
-	      rx_Bitset cs = rx_cset(&rxb->rx);
-	      struct rexp_node * match = rx_mk_r_cset (&rxb->rx, cs);
-	      rx_Bitset it;
-	      if (!(cs && match))
-		return REG_ESPACE;
-	      it = inverse_translation (rxb, validate_inv_tr,
-					inverse_translate, translate, c);
-	      rx_bitset_union (CHAR_SET_SIZE, cs, it);
-	      append = match;
-
-	    append_node:
-	      /* This genericly appends the rexp APPEND to *LAST_EXPRESSION
-	       * and then parses the next character normally.
-	       */
-	      if (*last_expression)
-		{
-		  struct rexp_node * concat
-		    = rx_mk_r_concat (&rxb->rx, *last_expression, append);
-		  if (!concat)
-		    return REG_ESPACE;
-		  *last_expression = concat;
-		  last_expression = &concat->params.pair.right;
-		}
-	      else
-		*last_expression = append;
-	    }
-	} /* switch (c) */
-    } /* while p != pend */
-
-
-  {
-    int win_se = paramc;
-    params = (params
-	      ? ((struct re_se_params *)
-		 realloc (params,
-			  sizeof (*params) * (1 + paramc)))
-	      : ((struct re_se_params *)
-		 malloc (sizeof (*params))));
-    if (!params)
-      return REG_ESPACE;
-    ++paramc;
-    params[win_se].se = re_se_win;
-    {
-      struct rexp_node * se
-	= rx_mk_r_side_effect (&rxb->rx, (rx_side_effect)win_se);
-      struct rexp_node * concat
-	= rx_mk_r_concat (&rxb->rx, rexp, se);
-      if (!(se && concat))
-	return REG_ESPACE;
-      rexp = concat;
-    }
-  }
-
-
-  /* Through the pattern now.  */
-
-  if (!COMPILE_STACK_EMPTY)
-    return REG_EPAREN;
-
-      free (compile_stack.stack);
-
-  orig_rexp = rexp;
-#ifdef RX_DEBUG
-  if (rx_debug_compile)
-    {
-      dbug_rxb = rxb;
-      fputs ("\n\nCompiling ", stdout);
-      fwrite (pattern, 1, size, stdout);
-      fputs (":\n", stdout);
-      rxb->se_params = params;
-      print_rexp (&rxb->rx, orig_rexp, 2, re_seprint, stdout);
-    }
-#endif
-  {
-    rx_Bitset cs = rx_cset(&rxb->rx);
-    rx_Bitset cs2 = rx_cset(&rxb->rx);
-    char * se_map = (char *) alloca (paramc);
-    struct rexp_node * new_rexp = 0;
-
-
-    bzero (se_map, paramc);
-    find_backrefs (se_map, rexp, params);
-    fewer_side_effects =
-      remove_unecessary_side_effects (&rxb->rx, se_map,
-				      rx_copy_rexp (&rxb->rx, rexp), params);
-
-    speed_up_alt (&rxb->rx, rexp, 0);
-    speed_up_alt (&rxb->rx, fewer_side_effects, 1);
-
-    {
-      char * syntax_parens = rxb->syntax_parens;
-      if (syntax_parens == (char *)0x1)
-	rexp = remove_unecessary_side_effects
-	  (&rxb->rx, se_map, rexp, params);
-      else if (syntax_parens)
-	{
-	  int x;
-	  for (x = 0; x < paramc; ++x)
-	    if ((   (params[x].se == re_se_lparen)
-		 || (params[x].se == re_se_rparen))
-		&& (!syntax_parens [params[x].op1]))
-	      se_map [x] = 1;
-	  rexp = remove_unecessary_side_effects
-	    (&rxb->rx, se_map, rexp, params);
-	}
-    }
-
-    /* At least one more optimization would be nice to have here but i ran out
-     * of time.  The idea would be to delay side effects.
-     * For examle, `(abc)' is the same thing as `abc()' except that the
-     * left paren is offset by 3 (which we know at compile time).
-     * (In this comment, write that second pattern `abc(:3:)'
-     * where `(:3:' is a syntactic unit.)
-     *
-     * Trickier:  `(abc|defg)'  is the same as `(abc(:3:|defg(:4:))'
-     * (The paren nesting may be hard to follow -- that's an alternation
-     *	of `abc(:3:' and `defg(:4:' inside (purely syntactic) parens
-     *  followed by the closing paren from the original expression.)
-     *
-     * Neither the expression tree representation nor the the nfa make
-     * this very easy to write. :(
-     */
-
-  /* What we compile is different than what the parser returns.
-   * Suppose the parser returns expression R.
-   * Let R' be R with unnecessary register assignments removed
-   * (see REMOVE_UNECESSARY_SIDE_EFFECTS, above).
-   *
-   * What we will compile is the expression:
-   *
-   *    m{try}R{win}\|s{try}R'{win}
-   *
-   * {try} and {win} denote side effect epsilons (see EXPLORE_FUTURE).
-   *
-   * When trying a match, we insert an `m' at the beginning of the
-   * string if the user wants registers to be filled, `s' if not.
-   */
-    new_rexp =
-      rx_mk_r_alternate
-	(&rxb->rx,
-	 rx_mk_r_concat (&rxb->rx, rx_mk_r_cset (&rxb->rx, cs2), rexp),
-	 rx_mk_r_concat (&rxb->rx,
-			 rx_mk_r_cset (&rxb->rx, cs), fewer_side_effects));
-
-    if (!(new_rexp && cs && cs2))
-      return REG_ESPACE;
-    RX_bitset_enjoin (cs2, '\0'); /* prefixed to the rexp used for matching. */
-    RX_bitset_enjoin (cs, '\1'); /* prefixed to the rexp used for searching. */
-    rexp = new_rexp;
-  }
-
-#ifdef RX_DEBUG
-  if (rx_debug_compile)
-    {
-      fputs ("\n...which is compiled as:\n", stdout);
-      print_rexp (&rxb->rx, rexp, 2, re_seprint, stdout);
-    }
-#endif
-  {
-    struct rx_nfa_state *start = 0;
-    struct rx_nfa_state *end = 0;
-
-    if (!rx_build_nfa (&rxb->rx, rexp, &start, &end))
-      return REG_ESPACE;	/*  */
-    else
-      {
-	void * mem = (void *)rxb->buffer;
-	unsigned long size = rxb->allocated;
-	int start_id;
-	char * perm_mem;
-	int iterator_size = paramc * sizeof (params[0]);
-
-	end->is_final = 1;
-	start->is_start = 1;
-	rx_name_nfa_states (&rxb->rx);
-	start_id = start->id;
-#ifdef RX_DEBUG
-	if (rx_debug_compile)
-	  {
-	    fputs ("...giving the NFA: \n", stdout);
-	    dbug_rxb = rxb;
-	    print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout);
-	  }
-#endif
-	if (!rx_eclose_nfa (&rxb->rx))
-	  return REG_ESPACE;
-	else
-	  {
-	    rx_delete_epsilon_transitions (&rxb->rx);
-
-	    /* For compatability reasons, we need to shove the
-	     * compiled nfa into one chunk of malloced memory.
-	     */
-	    rxb->rx.reserved = (   sizeof (params[0]) * paramc
-				+  rx_sizeof_bitset (rxb->rx.local_cset_size));
-#ifdef RX_DEBUG
-	    if (rx_debug_compile)
-	      {
-		dbug_rxb = rxb;
-		fputs ("...which cooks down (uncompactified) to: \n", stdout);
-		print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout);
-	      }
-#endif
-	    if (!rx_compactify_nfa (&rxb->rx, &mem, &size))
-	      return REG_ESPACE;
-	    rxb->buffer = mem;
-	    rxb->allocated = size;
-	    rxb->rx.buffer = mem;
-	    rxb->rx.allocated = size;
-	    perm_mem = ((char *)rxb->rx.buffer
-			+ rxb->rx.allocated - rxb->rx.reserved);
-	    rxb->se_params = ((struct re_se_params *)perm_mem);
-	    bcopy (params, rxb->se_params, iterator_size);
-	    perm_mem += iterator_size;
-	    rxb->fastset = (rx_Bitset) perm_mem;
-	    rxb->start = rx_id_to_nfa_state (&rxb->rx, start_id);
-	  }
-	rx_bitset_null (rxb->rx.local_cset_size, rxb->fastset);
-	rxb->can_match_empty = compute_fastset (rxb, orig_rexp);
-	rxb->match_regs_on_stack =
-	  registers_on_stack (rxb, orig_rexp, 0, params);
-	rxb->search_regs_on_stack =
-	  registers_on_stack (rxb, fewer_side_effects, 0, params);
-	if (rxb->can_match_empty)
-	  rx_bitset_universe (rxb->rx.local_cset_size, rxb->fastset);
-	rxb->is_anchored = is_anchored (orig_rexp, (rx_side_effect) re_se_hat);
-	rxb->begbuf_only = is_anchored (orig_rexp,
-					(rx_side_effect) re_se_begbuf);
-      }
-    rx_free_rexp (&rxb->rx, rexp);
-    if (params)
-      free (params);
-#ifdef RX_DEBUG
-    if (rx_debug_compile)
-      {
-	dbug_rxb = rxb;
-	fputs ("...which cooks down to: \n", stdout);
-	print_nfa (&rxb->rx, rxb->rx.nfa_states, re_seprint, stdout);
-      }
-#endif
-  }
-  return REG_NOERROR;
-}
-
-
-
-/* This table gives an error message for each of the error codes listed
-   in regex.h.  Obviously the order here has to be same as there.  */
-
-__const__ char * rx_error_msg[] =
-{ 0,						/* REG_NOERROR */
-    "No match",					/* REG_NOMATCH */
-    "Invalid regular expression",		/* REG_BADPAT */
-    "Invalid collation character",		/* REG_ECOLLATE */
-    "Invalid character class name",		/* REG_ECTYPE */
-    "Trailing backslash",			/* REG_EESCAPE */
-    "Invalid back reference",			/* REG_ESUBREG */
-    "Unmatched [ or [^",			/* REG_EBRACK */
-    "Unmatched ( or \\(",			/* REG_EPAREN */
-    "Unmatched \\{",				/* REG_EBRACE */
-    "Invalid content of \\{\\}",		/* REG_BADBR */
-    "Invalid range end",			/* REG_ERANGE */
-    "Memory exhausted",				/* REG_ESPACE */
-    "Invalid preceding regular expression",	/* REG_BADRPT */
-    "Premature end of regular expression",	/* REG_EEND */
-    "Regular expression too big",		/* REG_ESIZE */
-    "Unmatched ) or \\)",			/* REG_ERPAREN */
-};
-
-
-
-
-char rx_slowmap [256] =
-{
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
-};
-
-#ifdef __STDC__
-RX_DECL void
-rx_blow_up_fastmap (struct re_pattern_buffer * rxb)
-#else
-RX_DECL void
-rx_blow_up_fastmap (rxb)
-     struct re_pattern_buffer * rxb;
-#endif
-{
-  int x;
-  for (x = 0; x < 256; ++x)	/* &&&& 3.6 % */
-    rxb->fastmap [x] = !!RX_bitset_member (rxb->fastset, x);
-  rxb->fastmap_accurate = 1;
-}
-
-
-
-
-#if !defined(REGEX_MALLOC) && !defined(__GNUC__)
-#define RE_SEARCH_2_FN	inner_re_search_2
-#define RE_S2_QUAL static
-#else
-#define RE_SEARCH_2_FN	re_search_2
-#define RE_S2_QUAL
-#endif
-
-struct re_search_2_closure
-{
-  __const__ unsigned char * string1;
-  int size1;
-  __const__ unsigned char * string2;
-  int size2;
-};
-
-
-static __inline__ enum rx_get_burst_return
-re_search_2_get_burst (pos, vclosure, stop)
-     struct rx_string_position * pos;
-     void * vclosure;
-     int stop;
-{
-  struct re_search_2_closure * closure;
-  closure = (struct re_search_2_closure *)vclosure;
-  if (!closure->string2)
-    {
-      int inset;
-
-      inset = pos->pos - pos->string;
-      if ((inset < -1) || (inset > closure->size1))
-	return rx_get_burst_no_more;
-      else
-	{
-	  pos->pos = (__const__ unsigned char *) closure->string1 + inset;
-	  pos->string = (__const__ unsigned char *) closure->string1;
-	  pos->size = closure->size1;
-	  pos->end = ((__const__ unsigned char *)
-		      MIN(closure->string1 + closure->size1,
-			  closure->string1 + stop));
-	  pos->offset = 0;
-	  return ((pos->pos < pos->end)
-		  ? rx_get_burst_ok
-		  :  rx_get_burst_no_more);
-	}
-    }
-  else if (!closure->string1)
-    {
-      int inset;
-
-      inset = pos->pos - pos->string;
-      pos->pos = (__const__ unsigned char *) closure->string2 + inset;
-      pos->string = (__const__ unsigned char *) closure->string2;
-      pos->size = closure->size2;
-      pos->end = ((__const__ unsigned char *)
-		  MIN(closure->string2 + closure->size2,
-		      closure->string2 + stop));
-      pos->offset = 0;
-      return ((pos->pos < pos->end)
-	      ? rx_get_burst_ok
-	      :  rx_get_burst_no_more);
-    }
-  else
-    {
-      int inset;
-
-      inset = pos->pos - pos->string + pos->offset;
-      if (inset < closure->size1)
-	{
-	  pos->pos = (__const__ unsigned char *) closure->string1 + inset;
-	  pos->string = (__const__ unsigned char *) closure->string1;
-	  pos->size = closure->size1;
-	  pos->end = ((__const__ unsigned char *)
-		      MIN(closure->string1 + closure->size1,
-			  closure->string1 + stop));
-	  pos->offset = 0;
-	  return rx_get_burst_ok;
-	}
-      else
-	{
-	  pos->pos = ((__const__ unsigned char *)
-		      closure->string2 + inset - closure->size1);
-	  pos->string = (__const__ unsigned char *) closure->string2;
-	  pos->size = closure->size2;
-	  pos->end = ((__const__ unsigned char *)
-		      MIN(closure->string2 + closure->size2,
-			  closure->string2 + stop - closure->size1));
-	  pos->offset = closure->size1;
-	  return ((pos->pos < pos->end)
-		  ? rx_get_burst_ok
-		  :  rx_get_burst_no_more);
-	}
-    }
-}
-
-
-static __inline__ enum rx_back_check_return
-re_search_2_back_check (pos, lparen, rparen, translate, vclosure, stop)
-     struct rx_string_position * pos;
-     int lparen;
-     int rparen;
-     unsigned char * translate;
-     void * vclosure;
-     int stop;
-{
-  struct rx_string_position there;
-  struct rx_string_position past;
-
-  there = *pos;
-  there.pos = there.string + lparen - there.offset;
-  re_search_2_get_burst (&there, vclosure, stop);
-
-  past = *pos;
-  past.pos = past.string + rparen - there.offset;
-  re_search_2_get_burst (&past, vclosure, stop);
-
-  ++pos->pos;
-  re_search_2_get_burst (pos, vclosure, stop);
-
-  while (   (there.pos != past.pos)
-	 && (pos->pos != pos->end))
-    if (TRANSLATE(*there.pos) != TRANSLATE(*pos->pos))
-      return rx_back_check_fail;
-    else
-      {
-	++there.pos;
-	++pos->pos;
-	if (there.pos == there.end)
-	  re_search_2_get_burst (&there, vclosure, stop);
-	if (pos->pos == pos->end)
-	  re_search_2_get_burst (pos, vclosure, stop);
-      }
-
-  if (there.pos != past.pos)
-    return rx_back_check_fail;
-  --pos->pos;
-  re_search_2_get_burst (pos, vclosure, stop);
-  return rx_back_check_pass;
-}
-
-static __inline__ int
-re_search_2_fetch_char (pos, offset, app_closure, stop)
-     struct rx_string_position * pos;
-     int offset;
-     void * app_closure;
-     int stop;
-{
-  struct re_search_2_closure * closure;
-  closure = (struct re_search_2_closure *)app_closure;
-  if (offset == 0)
-    {
-      if (pos->pos >= pos->string)
-	return *pos->pos;
-      else
-	{
-	  if (   (pos->string == closure->string2)
-	      && (closure->string1)
-	      && (closure->size1))
-	    return closure->string1[closure->size1 - 1];
-	  else
-	    return 0;		/* sure, why not. */
-	}
-    }
-  if (pos->pos == pos->end)
-    return *closure->string2;
-  else
-    return pos->pos[1];
-}
-
-
-#ifdef __STDC__
-RE_S2_QUAL int
-RE_SEARCH_2_FN (struct re_pattern_buffer *rxb,
-		__const__ char * string1, int size1,
-		__const__ char * string2, int size2,
-		int startpos, int range,
-		struct re_registers *regs,
-		int stop)
-#else
-RE_S2_QUAL int
-RE_SEARCH_2_FN (rxb,
-		string1, size1, string2, size2, startpos, range, regs, stop)
-     struct re_pattern_buffer *rxb;
-     __const__ char * string1;
-     int size1;
-     __const__ char * string2;
-     int size2;
-     int startpos;
-     int range;
-     struct re_registers *regs;
-     int stop;
-#endif
-{
-  int answer;
-  struct re_search_2_closure closure;
-  closure.string1 = (__const__ unsigned char *) string1;
-  closure.size1 = size1;
-  closure.string2 = (__const__ unsigned char *) string2;
-  closure.size2 = size2;
-  answer = rx_search (rxb, startpos, range, stop, size1 + size2,
-		      re_search_2_get_burst,
-		      re_search_2_back_check,
-		      re_search_2_fetch_char,
-		      (void *)&closure,
-		      regs,
-		      0,
-		      0);
-  switch (answer)
-    {
-    case rx_search_continuation:
-      abort ();
-    case rx_search_error:
-      return -2;
-    case rx_search_soft_fail:
-    case rx_search_fail:
-      return -1;
-    default:
-      return answer;
-    }
-}
-
-/* Export rx_search to callers outside this file.  */
-
-int
-re_rx_search (rxb, startpos, range, stop, total_size,
-	      get_burst, back_check, fetch_char,
-	      app_closure, regs, resume_state, save_state)
-     struct re_pattern_buffer * rxb;
-     int startpos;
-     int range;
-     int stop;
-     int total_size;
-     rx_get_burst_fn get_burst;
-     rx_back_check_fn back_check;
-     rx_fetch_char_fn fetch_char;
-     void * app_closure;
-     struct re_registers * regs;
-     struct rx_search_state * resume_state;
-     struct rx_search_state * save_state;
-{
-  return rx_search (rxb, startpos, range, stop, total_size,
-		    get_burst, back_check, fetch_char, app_closure,
-		    regs, resume_state, save_state);
-}
-
-#if !defined(REGEX_MALLOC) && !defined(__GNUC__)
-#ifdef __STDC__
-int
-re_search_2 (struct re_pattern_buffer *rxb,
-	     __const__ char * string1, int size1,
-	     __const__ char * string2, int size2,
-	     int startpos, int range,
-	     struct re_registers *regs,
-	     int stop)
-#else
-int
-re_search_2 (rxb, string1, size1, string2, size2, startpos, range, regs, stop)
-     struct re_pattern_buffer *rxb;
-     __const__ char * string1;
-     int size1;
-     __const__ char * string2;
-     int size2;
-     int startpos;
-     int range;
-     struct re_registers *regs;
-     int stop;
-#endif
-{
-  int ret;
-  ret = inner_re_search_2 (rxb, string1, size1, string2, size2, startpos,
-			   range, regs, stop);
-  alloca (0);
-  return ret;
-}
-#endif
-
-
-/* Like re_search_2, above, but only one string is specified, and
- * doesn't let you say where to stop matching.
- */
-
-#ifdef __STDC__
-int
-re_search (struct re_pattern_buffer * rxb, __const__ char *string,
-	   int size, int startpos, int range,
-	   struct re_registers *regs)
-#else
-int
-re_search (rxb, string, size, startpos, range, regs)
-     struct re_pattern_buffer * rxb;
-     __const__ char * string;
-     int size;
-     int startpos;
-     int range;
-     struct re_registers *regs;
-#endif
-{
-  return re_search_2 (rxb, 0, 0, string, size, startpos, range, regs, size);
-}
-
-#ifdef __STDC__
-int
-re_match_2 (struct re_pattern_buffer * rxb,
-	    __const__ char * string1, int size1,
-	    __const__ char * string2, int size2,
-	    int pos, struct re_registers *regs, int stop)
-#else
-int
-re_match_2 (rxb, string1, size1, string2, size2, pos, regs, stop)
-     struct re_pattern_buffer * rxb;
-     __const__ char * string1;
-     int size1;
-     __const__ char * string2;
-     int size2;
-     int pos;
-     struct re_registers *regs;
-     int stop;
-#endif
-{
-  struct re_registers some_regs;
-  regoff_t start;
-  regoff_t end;
-  int srch;
-  int save = rxb->regs_allocated;
-  struct re_registers * regs_to_pass = regs;
-
-  if (!regs)
-    {
-      some_regs.start = &start;
-      some_regs.end = &end;
-      some_regs.num_regs = 1;
-      regs_to_pass = &some_regs;
-      rxb->regs_allocated = REGS_FIXED;
-    }
-
-  srch = re_search_2 (rxb, string1, size1, string2, size2,
-		      pos, 1, regs_to_pass, stop);
-  if (regs_to_pass != regs)
-    rxb->regs_allocated = save;
-  if (srch < 0)
-    return srch;
-  return regs_to_pass->end[0] - regs_to_pass->start[0];
-}
-
-/* re_match is like re_match_2 except it takes only a single string.  */
-
-#ifdef __STDC__
-int
-re_match (struct re_pattern_buffer * rxb,
-	  __const__ char * string,
-	  int size, int pos,
-	  struct re_registers *regs)
-#else
-int
-re_match (rxb, string, size, pos, regs)
-     struct re_pattern_buffer * rxb;
-     __const__ char *string;
-     int size;
-     int pos;
-     struct re_registers *regs;
-#endif
-{
-  return re_match_2 (rxb, string, size, 0, 0, pos, regs, size);
-}
-
-
-
-/* Set by `re_set_syntax' to the current regexp syntax to recognize.  Can
-   also be assigned to arbitrarily: each pattern buffer stores its own
-   syntax, so it can be changed between regex compilations.  */
-reg_syntax_t re_syntax_options = RE_SYNTAX_EMACS;
-
-
-/* Specify the precise syntax of regexps for compilation.  This provides
-   for compatibility for various utilities which historically have
-   different, incompatible syntaxes.
-
-   The argument SYNTAX is a bit mask comprised of the various bits
-   defined in regex.h.  We return the old syntax.  */
-
-#ifdef __STDC__
-reg_syntax_t
-re_set_syntax (reg_syntax_t syntax)
-#else
-reg_syntax_t
-re_set_syntax (syntax)
-    reg_syntax_t syntax;
-#endif
-{
-  reg_syntax_t ret = re_syntax_options;
-
-  re_syntax_options = syntax;
-  return ret;
-}
-
-
-/* Set REGS to hold NUM_REGS registers, storing them in STARTS and
-   ENDS.  Subsequent matches using PATTERN_BUFFER and REGS will use
-   this memory for recording register information.  STARTS and ENDS
-   must be allocated using the malloc library routine, and must each
-   be at least NUM_REGS * sizeof (regoff_t) bytes long.
-
-   If NUM_REGS == 0, then subsequent matches should allocate their own
-   register data.
-
-   Unless this function is called, the first search or match using
-   PATTERN_BUFFER will allocate its own register data, without
-   freeing the old data.  */
-
-#ifdef __STDC__
-void
-re_set_registers (struct re_pattern_buffer *bufp,
-		  struct re_registers *regs,
-		  unsigned num_regs,
-		  regoff_t * starts, regoff_t * ends)
-#else
-void
-re_set_registers (bufp, regs, num_regs, starts, ends)
-     struct re_pattern_buffer *bufp;
-     struct re_registers *regs;
-     unsigned num_regs;
-     regoff_t * starts;
-     regoff_t * ends;
-#endif
-{
-  if (num_regs)
-    {
-      bufp->regs_allocated = REGS_REALLOCATE;
-      regs->num_regs = num_regs;
-      regs->start = starts;
-      regs->end = ends;
-    }
-  else
-    {
-      bufp->regs_allocated = REGS_UNALLOCATED;
-      regs->num_regs = 0;
-      regs->start = regs->end = (regoff_t) 0;
-    }
-}
-
-
-
-
-#ifdef __STDC__
-static int
-cplx_se_sublist_len (struct rx_se_list * list)
-#else
-static int
-cplx_se_sublist_len (list)
-     struct rx_se_list * list;
-#endif
-{
-  int x = 0;
-  while (list)
-    {
-      if ((long)list->car >= 0)
-	++x;
-      list = list->cdr;
-    }
-  return x;
-}
-
-
-/* For rx->se_list_cmp */
-
-#ifdef __STDC__
-static int
-posix_se_list_order (struct rx * rx,
-		     struct rx_se_list * a, struct rx_se_list * b)
-#else
-static int
-posix_se_list_order (rx, a, b)
-     struct rx * rx;
-     struct rx_se_list * a;
-     struct rx_se_list * b;
-#endif
-{
-  int al = cplx_se_sublist_len (a);
-  int bl = cplx_se_sublist_len (b);
-
-  if (!al && !bl)
-    return ((a == b)
-	    ? 0
-	    : ((a < b) ? -1 : 1));
-
-  else if (!al)
-    return -1;
-
-  else if (!bl)
-    return 1;
-
-  else
-    {
-      rx_side_effect * av = ((rx_side_effect *)
-			     alloca (sizeof (rx_side_effect) * (al + 1)));
-      rx_side_effect * bv = ((rx_side_effect *)
-			     alloca (sizeof (rx_side_effect) * (bl + 1)));
-      struct rx_se_list * ap = a;
-      struct rx_se_list * bp = b;
-      int ai, bi;
-
-      for (ai = al - 1; ai >= 0; --ai)
-	{
-	  while ((long)ap->car < 0)
-	    ap = ap->cdr;
-	  av[ai] = ap->car;
-	  ap = ap->cdr;
-	}
-      av[al] = (rx_side_effect)-2;
-      for (bi = bl - 1; bi >= 0; --bi)
-	{
-	  while ((long)bp->car < 0)
-	    bp = bp->cdr;
-	  bv[bi] = bp->car;
-	  bp = bp->cdr;
-	}
-      bv[bl] = (rx_side_effect)-1;
-
-      {
-	int ret;
-	int x = 0;
-	while (av[x] == bv[x])
-	  ++x;
- 	ret = (((unsigned *)(av[x]) < (unsigned *)(bv[x])) ? -1 : 1);
-	return ret;
-      }
-    }
-}
-
-
-
-
-/* re_compile_pattern is the GNU regular expression compiler: it
-   compiles PATTERN (of length SIZE) and puts the result in RXB.
-   Returns 0 if the pattern was valid, otherwise an error string.
-
-   Assumes the `allocated' (and perhaps `buffer') and `translate' fields
-   are set in RXB on entry.
-
-   We call rx_compile to do the actual compilation.  */
-
-#ifdef __STDC__
-__const__ char *
-re_compile_pattern (__const__ char *pattern,
-		    int length,
-		    struct re_pattern_buffer * rxb)
-#else
-__const__ char *
-re_compile_pattern (pattern, length, rxb)
-     __const__ char *pattern;
-     int length;
-     struct re_pattern_buffer * rxb;
-#endif
-{
-  reg_errcode_t ret;
-
-  /* GNU code is written to assume at least RE_NREGS registers will be set
-     (and at least one extra will be -1).  */
-  rxb->regs_allocated = REGS_UNALLOCATED;
-
-  /* And GNU code determines whether or not to get register information
-     by passing null for the REGS argument to re_match, etc., not by
-     setting no_sub.  */
-  rxb->no_sub = 0;
-
-  rxb->rx.local_cset_size = 256;
-
-  /* Match anchors at newline.  */
-  rxb->newline_anchor = 1;
-
-  rxb->re_nsub = 0;
-  rxb->start = 0;
-  rxb->se_params = 0;
-  rxb->rx.nodec = 0;
-  rxb->rx.epsnodec = 0;
-  rxb->rx.instruction_table = 0;
-  rxb->rx.nfa_states = 0;
-  rxb->rx.se_list_cmp = posix_se_list_order;
-  rxb->rx.start_set = 0;
-
-  ret = rx_compile (pattern, length, re_syntax_options, rxb);
-  alloca (0);
-  return rx_error_msg[(int) ret];
-}
-
-
-
-#ifdef __STDC__
-int
-re_compile_fastmap (struct re_pattern_buffer * rxb)
-#else
-int
-re_compile_fastmap (rxb)
-     struct re_pattern_buffer * rxb;
-#endif
-{
-  rx_blow_up_fastmap (rxb);
-  return 0;
-}
-
-
-
-
-/* Entry points compatible with 4.2 BSD regex library.  We don't define
-   them if this is an Emacs or POSIX compilation.  */
-
-#if (!defined (emacs) && !defined (_POSIX_SOURCE)) || defined(USE_BSD_REGEX)
-
-/* BSD has one and only one pattern buffer.  */
-static struct re_pattern_buffer rx_comp_buf;
-
-#ifdef __STDC__
-char *
-re_comp (__const__ char *s)
-#else
-char *
-re_comp (s)
-    __const__ char *s;
-#endif
-{
-  reg_errcode_t ret;
-
-  if (!s || (*s == '\0'))
-    {
-      if (!rx_comp_buf.buffer)
-	return "No previous regular expression";
-      return 0;
-    }
-
-  if (!rx_comp_buf.fastmap)
-    {
-      rx_comp_buf.fastmap = (char *) malloc (1 << CHARBITS);
-      if (!rx_comp_buf.fastmap)
-	return "Memory exhausted";
-    }
-
-  /* Since `rx_exec' always passes NULL for the `regs' argument, we
-     don't need to initialize the pattern buffer fields which affect it.  */
-
-  /* Match anchors at newlines.  */
-  rx_comp_buf.newline_anchor = 1;
-
-  rx_comp_buf.fastmap_accurate = 0;
-  rx_comp_buf.re_nsub = 0;
-  rx_comp_buf.start = 0;
-  rx_comp_buf.se_params = 0;
-  rx_comp_buf.rx.nodec = 0;
-  rx_comp_buf.rx.epsnodec = 0;
-  rx_comp_buf.rx.instruction_table = 0;
-  rx_comp_buf.rx.nfa_states = 0;
-  rx_comp_buf.rx.start = 0;
-  rx_comp_buf.rx.se_list_cmp = posix_se_list_order;
-  rx_comp_buf.rx.start_set = 0;
-  rx_comp_buf.rx.local_cset_size = 256;
-
-  ret = rx_compile (s, strlen (s), re_syntax_options, &rx_comp_buf);
-  alloca (0);
-
-  /* Yes, we're discarding `__const__' here.  */
-  return (char *) rx_error_msg[(int) ret];
-}
-
-
-#ifdef __STDC__
-int
-re_exec (__const__ char *s)
-#else
-int
-re_exec (s)
-    __const__ char *s;
-#endif
-{
-  __const__ int len = strlen (s);
-  return
-    0 <= re_search (&rx_comp_buf, s, len, 0, len, (struct re_registers *) 0);
-}
-#endif /* not emacs and not _POSIX_SOURCE */
-
-
-
-/* POSIX.2 functions.  Don't define these for Emacs.  */
-
-#if !defined(emacs)
-
-/* regcomp takes a regular expression as a string and compiles it.
-
-   PREG is a regex_t *.  We do not expect any fields to be initialized,
-   since POSIX says we shouldn't.  Thus, we set
-
-     `buffer' to the compiled pattern;
-     `used' to the length of the compiled pattern;
-     `syntax' to RE_SYNTAX_POSIX_EXTENDED if the
-       REG_EXTENDED bit in CFLAGS is set; otherwise, to
-       RE_SYNTAX_POSIX_BASIC;
-     `newline_anchor' to REG_NEWLINE being set in CFLAGS;
-     `fastmap' and `fastmap_accurate' to zero;
-     `re_nsub' to the number of subexpressions in PATTERN.
-
-   PATTERN is the address of the pattern string.
-
-   CFLAGS is a series of bits which affect compilation.
-
-     If REG_EXTENDED is set, we use POSIX extended syntax; otherwise, we
-     use POSIX basic syntax.
-
-     If REG_NEWLINE is set, then . and [^...] don't match newline.
-     Also, regexec will try a match beginning after every newline.
-
-     If REG_ICASE is set, then we considers upper- and lowercase
-     versions of letters to be equivalent when matching.
-
-     If REG_NOSUB is set, then when PREG is passed to regexec, that
-     routine will report only success or failure, and nothing about the
-     registers.
-
-   It returns 0 if it succeeds, nonzero if it doesn't.  (See regex.h for
-   the return codes and their meanings.)  */
-
-
-#ifdef __STDC__
-int
-regcomp (regex_t * preg, __const__ char * pattern, int cflags)
-#else
-int
-regcomp (preg, pattern, cflags)
-    regex_t * preg;
-    __const__ char * pattern;
-    int cflags;
-#endif
-{
-  reg_errcode_t ret;
-  unsigned syntax
-    = cflags & REG_EXTENDED ? RE_SYNTAX_POSIX_EXTENDED : RE_SYNTAX_POSIX_BASIC;
-
-  /* regex_compile will allocate the space for the compiled pattern.  */
-  preg->buffer = 0;
-  preg->allocated = 0;
-  preg->fastmap = malloc (256);
-  if (!preg->fastmap)
-    return REG_ESPACE;
-  preg->fastmap_accurate = 0;
-
-  if (cflags & REG_ICASE)
-    {
-      unsigned i;
-
-      preg->translate = (unsigned char *) malloc (256);
-      if (!preg->translate)
-        return (int) REG_ESPACE;
-
-      /* Map uppercase characters to corresponding lowercase ones.  */
-      for (i = 0; i < CHAR_SET_SIZE; i++)
-        preg->translate[i] = isupper (i) ? tolower (i) : i;
-    }
-  else
-    preg->translate = 0;
-
-  /* If REG_NEWLINE is set, newlines are treated differently.  */
-  if (cflags & REG_NEWLINE)
-    { /* REG_NEWLINE implies neither . nor [^...] match newline.  */
-      syntax &= ~RE_DOT_NEWLINE;
-      syntax |= RE_HAT_LISTS_NOT_NEWLINE;
-      /* It also changes the matching behavior.  */
-      preg->newline_anchor = 1;
-    }
-  else
-    preg->newline_anchor = 0;
-
-  preg->no_sub = !!(cflags & REG_NOSUB);
-
-  /* POSIX says a null character in the pattern terminates it, so we
-     can use strlen here in compiling the pattern.  */
-  preg->re_nsub = 0;
-  preg->start = 0;
-  preg->se_params = 0;
-  preg->syntax_parens = 0;
-  preg->rx.nodec = 0;
-  preg->rx.epsnodec = 0;
-  preg->rx.instruction_table = 0;
-  preg->rx.nfa_states = 0;
-  preg->rx.local_cset_size = 256;
-  preg->rx.start = 0;
-  preg->rx.se_list_cmp = posix_se_list_order;
-  preg->rx.start_set = 0;
-  ret = rx_compile (pattern, strlen (pattern), syntax, preg);
-  alloca (0);
-
-  /* POSIX doesn't distinguish between an unmatched open-group and an
-     unmatched close-group: both are REG_EPAREN.  */
-  if (ret == REG_ERPAREN) ret = REG_EPAREN;
-
-  return (int) ret;
-}
-
-
-/* regexec searches for a given pattern, specified by PREG, in the
-   string STRING.
-
-   If NMATCH is zero or REG_NOSUB was set in the cflags argument to
-   `regcomp', we ignore PMATCH.  Otherwise, we assume PMATCH has at
-   least NMATCH elements, and we set them to the offsets of the
-   corresponding matched substrings.
-
-   EFLAGS specifies `execution flags' which affect matching: if
-   REG_NOTBOL is set, then ^ does not match at the beginning of the
-   string; if REG_NOTEOL is set, then $ does not match at the end.
-
-   We return 0 if we find a match and REG_NOMATCH if not.  */
-
-#ifdef __STDC__
-int
-regexec (__const__ regex_t *preg, __const__ char *string,
-	 size_t nmatch, regmatch_t pmatch[],
-	 int eflags)
-#else
-int
-regexec (preg, string, nmatch, pmatch, eflags)
-    __const__ regex_t *preg;
-    __const__ char *string;
-    size_t nmatch;
-    regmatch_t pmatch[];
-    int eflags;
-#endif
-{
-  int ret;
-  struct re_registers regs;
-  regex_t private_preg;
-  int len = strlen (string);
-  boolean want_reg_info = !preg->no_sub && nmatch > 0;
-
-  private_preg = *preg;
-
-  private_preg.not_bol = !!(eflags & REG_NOTBOL);
-  private_preg.not_eol = !!(eflags & REG_NOTEOL);
-
-  /* The user has told us exactly how many registers to return
-   * information about, via `nmatch'.  We have to pass that on to the
-   * matching routines.
-   */
-  private_preg.regs_allocated = REGS_FIXED;
-
-  if (want_reg_info)
-    {
-      regs.num_regs = nmatch;
-      regs.start =  (( regoff_t *) malloc ((nmatch) * sizeof ( regoff_t)));
-      regs.end =  (( regoff_t *) malloc ((nmatch) * sizeof ( regoff_t)));
-      if (regs.start == 0 || regs.end == 0)
-        return (int) REG_NOMATCH;
-    }
-
-  /* Perform the searching operation.  */
-  ret = re_search (&private_preg,
-		   string, len,
-                   /* start: */ 0,
-		   /* range: */ len,
-                   want_reg_info ? &regs : (struct re_registers *) 0);
-
-  /* Copy the register information to the POSIX structure.  */
-  if (want_reg_info)
-    {
-      if (ret >= 0)
-        {
-          unsigned r;
-
-          for (r = 0; r < nmatch; r++)
-            {
-              pmatch[r].rm_so = regs.start[r];
-              pmatch[r].rm_eo = regs.end[r];
-            }
-        }
-
-      /* If we needed the temporary register info, free the space now.  */
-      free (regs.start);
-      free (regs.end);
-    }
-
-  /* We want zero return to mean success, unlike `re_search'.  */
-  return ret >= 0 ? (int) REG_NOERROR : (int) REG_NOMATCH;
-}
-
-
-/* Returns a message corresponding to an error code, ERRCODE, returned
-   from either regcomp or regexec.   */
-
-#ifdef __STDC__
-size_t
-regerror (int errcode, __const__ regex_t *preg,
-	  char *errbuf, size_t errbuf_size)
-#else
-size_t
-regerror (errcode, preg, errbuf, errbuf_size)
-    int errcode;
-    __const__ regex_t *preg;
-    char *errbuf;
-    size_t errbuf_size;
-#endif
-{
-  __const__ char *msg
-    = rx_error_msg[errcode] == 0 ? "Success" : rx_error_msg[errcode];
-  size_t msg_size = strlen (msg) + 1; /* Includes the 0.  */
-
-  if (errbuf_size != 0)
-    {
-      if (msg_size > errbuf_size)
-        {
-          strncpy (errbuf, msg, errbuf_size - 1);
-          errbuf[errbuf_size - 1] = 0;
-        }
-      else
-        strcpy (errbuf, msg);
-    }
-
-  return msg_size;
-}
-
-
-/* Free dynamically allocated space used by PREG.  */
-
-#ifdef __STDC__
-void
-regfree (regex_t *preg)
-#else
-void
-regfree (preg)
-    regex_t *preg;
-#endif
-{
-  if (preg->buffer != 0)
-    free (preg->buffer);
-  preg->buffer = 0;
-  preg->allocated = 0;
-
-  if (preg->fastmap != 0)
-    free (preg->fastmap);
-  preg->fastmap = 0;
-  preg->fastmap_accurate = 0;
-
-  if (preg->translate != 0)
-    free (preg->translate);
-  preg->translate = 0;
-}
-
-#endif /* not emacs  */