--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2003-04-01  Bruno Haible  <bruno@clisp.org>
+
+	* modules/pathname: New file.
+	* MODULES.html.sh (func_all_modules): Add it.
+
 2003-03-28  Bruno Haible  <bruno@clisp.org>
 
 	* modules/copy-file: New file.

--- a/MODULES.html.sh
+++ b/MODULES.html.sh
@@ -1733,7 +1733,7 @@
   func_module modechange
   func_module mountlist
   func_module path-concat
-  #func_module pathname
+  func_module pathname
   func_module pathmax
   func_module same
   func_module save-cwd

--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,3 +1,8 @@
+2003-04-01  Bruno Haible  <bruno@clisp.org>
+
+	* pathname.h: New file, from GNU gettext.
+	* concatpath.c: New file, from GNU gettext.
+
 2003-03-30  Bruno Haible  <bruno@clisp.org>
 
 	* copy-file.c (copy_file_preserving): Don't set owner if the function

new file mode 100644
--- /dev/null
+++ b/lib/concatpath.c
@@ -0,0 +1,71 @@
+/* Construct a full pathname from a directory and a filename.
+   Copyright (C) 2001-2002 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.  */
+
+/* Written by Bruno Haible <haible@clisp.cons.org>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification.  */
+#include "pathname.h"
+
+#include <string.h>
+
+#include "xalloc.h"
+#include "stpcpy.h"
+
+/* Concatenate a directory pathname, a relative pathname and an optional
+   suffix.  The directory may end with the directory separator.  The second
+   argument may not start with the directory separator (it is relative).
+   Return a freshly allocated pathname.  */
+char *
+concatenated_pathname (const char *directory, const char *filename,
+		       const char *suffix)
+{
+  char *result;
+  char *p;
+
+  if (strcmp (directory, ".") == 0)
+    {
+      /* No need to prepend the directory.  */
+      result = (char *) xmalloc (strlen (filename)
+				 + (suffix != NULL ? strlen (suffix) : 0)
+				 + 1);
+      p = result;
+    }
+  else
+    {
+      size_t directory_len = strlen (directory);
+      int need_slash =
+	(directory_len > FILESYSTEM_PREFIX_LEN (directory)
+	 && !ISSLASH (directory[directory_len - 1]));
+      result = (char *) xmalloc (directory_len + need_slash
+				 + strlen (filename)
+				 + (suffix != NULL ? strlen (suffix) : 0)
+				 + 1);
+      memcpy (result, directory, directory_len);
+      p = result + directory_len;
+      if (need_slash)
+	*p++ = '/';
+    }
+  p = stpcpy (p, filename);
+  if (suffix != NULL)
+    stpcpy (p, suffix);
+  return result;
+}

new file mode 100644
--- /dev/null
+++ b/lib/pathname.h
@@ -0,0 +1,50 @@
+/* Pathname support.
+   Copyright (C) 2001-2002 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef _PATHNAME_H
+#define _PATHNAME_H
+
+/* Pathname support.
+   ISSLASH(C)           tests whether C is a directory separator character.
+   IS_ABSOLUTE_PATH(P)  tests whether P is an absolute path.  If it is not,
+                        it may be concatenated to a directory pathname.
+   IS_PATH_WITH_DIR(P)  tests whether P contains a directory specification.
+ */
+#if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
+  /* Win32, OS/2, DOS */
+# define ISSLASH(C) ((C) == '/' || (C) == '\\')
+# define HAS_DEVICE(P) \
+    ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
+     && (P)[1] == ':')
+# define IS_ABSOLUTE_PATH(P) (ISSLASH ((P)[0]) || HAS_DEVICE (P))
+# define IS_PATH_WITH_DIR(P) \
+    (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
+# define FILESYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
+#else
+  /* Unix */
+# define ISSLASH(C) ((C) == '/')
+# define IS_ABSOLUTE_PATH(P) ISSLASH ((P)[0])
+# define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
+# define FILESYSTEM_PREFIX_LEN(P) 0
+#endif
+
+/* Concatenate a directory pathname, a relative pathname and an optional
+   suffix.  Return a freshly allocated pathname.  */
+extern char *concatenated_pathname (const char *directory,
+				    const char *filename, const char *suffix);
+
+#endif /* _PATHNAME_H */

new file mode 100644
--- /dev/null
+++ b/modules/pathname
@@ -0,0 +1,23 @@
+Description:
+Construct a full pathname by concatenating a directory name, a relative
+filename, and a suffix.
+
+Files:
+lib/pathname.h
+lib/concatpath.c
+
+Depends-on:
+xalloc
+stpcpy
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += pathname.h concatpath.c
+
+Include:
+"pathname.h"
+
+Maintainer:
+Bruno Haible
+