# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1169924153 0
# Node ID e7362b22c4aaa403d759ffff5391917cd2b7d017
# Parent  6a4142026bb4669816ae1e301b6ac34f1a6985ed
Move to here from u8-mbtouc.c.

diff --git a/lib/unistr/u8-mbtouc-unsafe.c b/lib/unistr/u8-mbtouc-unsafe.c
new file mode 100644
--- /dev/null
+++ b/lib/unistr/u8-mbtouc-unsafe.c
@@ -0,0 +1,175 @@
+/* Look at first character in UTF-8 string.
+   Copyright (C) 1999-2002, 2006-2007 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2001.
+
+   This program 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.
+
+   This program 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "unistr.h"
+
+#if !HAVE_INLINE
+
+int
+u8_mbtouc_unsafe (ucs4_t *puc, const uint8_t *s, size_t n)
+{
+  uint8_t c = *s;
+
+  if (c < 0x80)
+    {
+      *puc = c;
+      return 1;
+    }
+  else if (c >= 0xc2)
+    {
+      if (c < 0xe0)
+	{
+	  if (n >= 2)
+	    {
+#if CONFIG_UNICODE_SAFETY
+	      if ((s[1] ^ 0x80) < 0x40)
+#endif
+		{
+		  *puc = ((unsigned int) (c & 0x1f) << 6)
+		         | (unsigned int) (s[1] ^ 0x80);
+		  return 2;
+		}
+	      /* invalid multibyte character */
+	    }
+	  else
+	    {
+	      /* incomplete multibyte character */
+	      *puc = 0xfffd;
+	      return n;
+	    }
+	}
+      else if (c < 0xf0)
+	{
+	  if (n >= 3)
+	    {
+#if CONFIG_UNICODE_SAFETY
+	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
+		  && (c >= 0xe1 || s[1] >= 0xa0)
+		  && (c != 0xed || s[1] < 0xa0))
+#endif
+		{
+		  *puc = ((unsigned int) (c & 0x0f) << 12)
+		         | ((unsigned int) (s[1] ^ 0x80) << 6)
+		         | (unsigned int) (s[2] ^ 0x80);
+		  return 3;
+		}
+	      /* invalid multibyte character */
+	    }
+	  else
+	    {
+	      /* incomplete multibyte character */
+	      *puc = 0xfffd;
+	      return n;
+	    }
+	}
+      else if (c < 0xf8)
+	{
+	  if (n >= 4)
+	    {
+#if CONFIG_UNICODE_SAFETY
+	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
+		  && (s[3] ^ 0x80) < 0x40
+		  && (c >= 0xf1 || s[1] >= 0x90)
+#if 1
+		  && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))
+#endif
+		 )
+#endif
+		{
+		  *puc = ((unsigned int) (c & 0x07) << 18)
+		         | ((unsigned int) (s[1] ^ 0x80) << 12)
+		         | ((unsigned int) (s[2] ^ 0x80) << 6)
+		         | (unsigned int) (s[3] ^ 0x80);
+		  return 4;
+		}
+	      /* invalid multibyte character */
+	    }
+	  else
+	    {
+	      /* incomplete multibyte character */
+	      *puc = 0xfffd;
+	      return n;
+	    }
+	}
+#if 0
+      else if (c < 0xfc)
+	{
+	  if (n >= 5)
+	    {
+#if CONFIG_UNICODE_SAFETY
+	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
+		  && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
+		  && (c >= 0xf9 || s[1] >= 0x88))
+#endif
+		{
+		  *puc = ((unsigned int) (c & 0x03) << 24)
+		         | ((unsigned int) (s[1] ^ 0x80) << 18)
+		         | ((unsigned int) (s[2] ^ 0x80) << 12)
+		         | ((unsigned int) (s[3] ^ 0x80) << 6)
+		         | (unsigned int) (s[4] ^ 0x80);
+		  return 5;
+		}
+	      /* invalid multibyte character */
+	    }
+	  else
+	    {
+	      /* incomplete multibyte character */
+	      *puc = 0xfffd;
+	      return n;
+	    }
+	}
+      else if (c < 0xfe)
+	{
+	  if (n >= 6)
+	    {
+#if CONFIG_UNICODE_SAFETY
+	      if ((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
+		  && (s[3] ^ 0x80) < 0x40 && (s[4] ^ 0x80) < 0x40
+		  && (s[5] ^ 0x80) < 0x40
+		  && (c >= 0xfd || s[1] >= 0x84))
+#endif
+		{
+		  *puc = ((unsigned int) (c & 0x01) << 30)
+		         | ((unsigned int) (s[1] ^ 0x80) << 24)
+		         | ((unsigned int) (s[2] ^ 0x80) << 18)
+		         | ((unsigned int) (s[3] ^ 0x80) << 12)
+		         | ((unsigned int) (s[4] ^ 0x80) << 6)
+		         | (unsigned int) (s[5] ^ 0x80);
+		  return 6;
+		}
+	      /* invalid multibyte character */
+	    }
+	  else
+	    {
+	      /* incomplete multibyte character */
+	      *puc = 0xfffd;
+	      return n;
+	    }
+	}
+#endif
+    }
+  /* invalid multibyte character */
+  *puc = 0xfffd;
+  return 1;
+}
+
+#endif