Adding upstream version 5.1.upstream/5.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/lib/sh/pathcanon.c b/lib/sh/pathcanon.c
new file mode 100644
index 0000000..7d0df9f
--- /dev/null
+++ b/lib/sh/pathcanon.c
@@ -0,0 +1,234 @@
+/* pathcanon.c -- canonicalize and manipulate pathnames. */
+
+/* Copyright (C) 2000 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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 3 of the License, or
+   (at your option) any later version.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#include <bashtypes.h>
+#if defined (HAVE_SYS_PARAM_H)
+#  include <sys/param.h>
+#endif
+#include <posixstat.h>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>
+#endif
+
+#include <filecntl.h>
+#include <bashansi.h>
+#include <stdio.h>
+#include <chartypes.h>
+#include <errno.h>
+
+#include "shell.h"
+
+#if !defined (errno)
+extern int errno;
+#endif
+
+#if defined (__CYGWIN__)
+#include <sys/cygwin.h>
+
+static int
+_is_cygdrive (path)
+     char *path;
+{
+  static char user[MAXPATHLEN];
+  static char system[MAXPATHLEN];
+  static int first_time = 1;
+
+  /* If the path is the first part of a network path, treat it as
+     existing. */
+  if (path[0] == '/' && path[1] == '/' && !strchr (path + 2, '/'))
+    return 1; 
+  /* Otherwise check for /cygdrive prefix. */
+  if (first_time)
+    {
+      char user_flags[MAXPATHLEN];
+      char system_flags[MAXPATHLEN];
+      /* Get the cygdrive info */
+      cygwin_internal (CW_GET_CYGDRIVE_INFO, user, system, user_flags, system_flags);
+      first_time = 0;
+    }
+  return !strcasecmp (path, user) || !strcasecmp (path, system);
+}
+#endif /* __CYGWIN__ */	
+
+/* Return 1 if PATH corresponds to a directory.  A function for debugging. */
+static int
+_path_isdir (path)
+     char *path;
+{
+  int l;
+  struct stat sb;
+
+  /* This should leave errno set to the correct value. */
+  errno = 0;
+  l = stat (path, &sb) == 0 && S_ISDIR (sb.st_mode);
+#if defined (__CYGWIN__)
+  if (l == 0)
+    l = _is_cygdrive (path);
+#endif
+  return l;
+}
+
+/* Canonicalize PATH, and return a new path.  The new path differs from PATH
+   in that:
+	Multiple `/'s are collapsed to a single `/'.
+	Leading `./'s and trailing `/.'s are removed.
+	Trailing `/'s are removed.
+	Non-leading `../'s and trailing `..'s are handled by removing
+	portions of the path. */
+
+/* Look for ROOTEDPATH, PATHSEP, DIRSEP, and ISDIRSEP in ../../general.h */
+
+#define DOUBLE_SLASH(p)	((p[0] == '/') && (p[1] == '/') && p[2] != '/')
+
+char *
+sh_canonpath (path, flags)
+     char *path;
+     int flags;
+{
+  char stub_char;
+  char *result, *p, *q, *base, *dotdot;
+  int rooted, double_slash_path;
+
+  /* The result cannot be larger than the input PATH. */
+  result = (flags & PATH_NOALLOC) ? path : savestring (path);
+
+  /* POSIX.2 says to leave a leading `//' alone.  On cygwin, we skip over any
+     leading `x:' (dos drive name). */
+  if (rooted = ROOTEDPATH(path))
+    {
+      stub_char = DIRSEP;
+#if defined (__CYGWIN__)
+      base = (ISALPHA((unsigned char)result[0]) && result[1] == ':') ? result + 3 : result + 1;
+#else
+      base = result + 1;
+#endif
+      double_slash_path = DOUBLE_SLASH (path);
+      base += double_slash_path;
+    }
+  else
+    {
+      stub_char = '.';
+#if defined (__CYGWIN__)
+      base = (ISALPHA((unsigned char)result[0]) && result[1] == ':') ? result + 2 : result;
+#else
+      base = result;
+#endif
+      double_slash_path = 0;
+    }
+
+  /*
+   * invariants:
+   *	  base points to the portion of the path we want to modify
+   *      p points at beginning of path element we're considering.
+   *      q points just past the last path element we wrote (no slash).
+   *      dotdot points just past the point where .. cannot backtrack
+   *	  any further (no slash).
+   */
+  p = q = dotdot = base;
+
+  while (*p)
+    {
+      if (ISDIRSEP(p[0])) /* null element */
+	p++;
+      else if(p[0] == '.' && PATHSEP(p[1]))	/* . and ./ */
+	p += 1; 	/* don't count the separator in case it is nul */
+      else if (p[0] == '.' && p[1] == '.' && PATHSEP(p[2])) /* .. and ../ */
+	{
+	  p += 2; /* skip `..' */
+	  if (q > dotdot)	/* can backtrack */
+	    {
+	      if (flags & PATH_CHECKDOTDOT)
+		{
+		  char c;
+
+		  /* Make sure what we have so far corresponds to a valid
+		     path before we chop some of it off. */
+		  c = *q;
+		  *q = '\0';
+		  if (_path_isdir (result) == 0)
+		    {
+		      if ((flags & PATH_NOALLOC) == 0)
+			free (result);
+		      return ((char *)NULL);
+		    }
+		  *q = c;
+		}
+
+	      while (--q > dotdot && ISDIRSEP(*q) == 0)
+		;
+	    }
+	  else if (rooted == 0)
+	    {
+	      /* /.. is / but ./../ is .. */
+	      if (q != base)
+		*q++ = DIRSEP;
+	      *q++ = '.';
+	      *q++ = '.';
+	      dotdot = q;
+	    }
+	}
+      else	/* real path element */
+	{
+	  /* add separator if not at start of work portion of result */
+	  if (q != base)
+	    *q++ = DIRSEP;
+	  while (*p && (ISDIRSEP(*p) == 0))
+	    *q++ = *p++;
+	  /* Check here for a valid directory with _path_isdir. */
+	  if (flags & PATH_CHECKEXISTS)
+	    {
+	      char c;
+
+	      /* Make sure what we have so far corresponds to a valid
+		 path before we chop some of it off. */
+	      c = *q;
+	      *q = '\0';
+	      if (_path_isdir (result) == 0)
+		{
+		  if ((flags & PATH_NOALLOC) == 0)
+		    free (result);
+		  return ((char *)NULL);
+		}
+	      *q = c;
+	    }
+	}
+    }
+
+  /* Empty string is really ``.'' or `/', depending on what we started with. */
+  if (q == result)
+    *q++ = stub_char;
+  *q = '\0';
+
+  /* If the result starts with `//', but the original path does not, we
+     can turn the // into /.  Because of how we set `base', this should never
+     be true, but it's a sanity check. */
+  if (DOUBLE_SLASH(result) && double_slash_path == 0)
+    {
+      if (result[2] == '\0')	/* short-circuit for bare `//' */
+	result[1] = '\0';
+      else
+	memmove (result, result + 1, strlen (result + 1) + 1);
+    }
+
+  return (result);
+}