X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fdirname.c;h=8651174cada8f627707ecc221d9b4364b2d9d845;hb=c3c259f0bef8cfd8d47606475348f088f7b0e120;hp=cf62de7a042f4a19cbe2c720720e8a76d7f53869;hpb=373d8ea1b7074011bd6dc3605e1ef855cfb4af03;p=gnulib.git

diff --git a/lib/dirname.c b/lib/dirname.c
index cf62de7a0..8651174ca 100644
--- a/lib/dirname.c
+++ b/lib/dirname.c
@@ -1,5 +1,5 @@
 /* dirname.c -- return all but the last element in a path
-   Copyright (C) 1990, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1990, 1998, 2000 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
@@ -32,22 +32,62 @@ char *malloc ();
 #  define strrchr rindex
 # endif
 #endif
+#include <assert.h>
+
+#ifndef HAVE_DECL_MEMRCHR
+"this configure-time declaration test was not run"
+#endif
+#if !HAVE_DECL_MEMRCHR
+void *memrchr ();
+#endif
 
 #include "dirname.h"
 
-/* Return the leading directories part of PATH,
-   allocated with malloc.  If out of memory, return 0.
-   Assumes that trailing slashes have already been
-   removed.  */
+#ifndef ISSLASH
+# define ISSLASH(C) ((C) == '/')
+#endif
 
-char *
-dir_name (const char *path)
+#define BACKSLASH_IS_PATH_SEPARATOR ISSLASH ('\\')
+
+/* Return the length of `dirname (PATH)' and set *RESULT
+   to point to PATH or to `"."', as appropriate.
+   Works properly even if there are trailing slashes
+   (by effectively ignoring them).  */
+size_t
+dir_name_r (const char *path, const char **result)
 {
-  char *newpath;
   char *slash;
   int length;			/* Length of result, not including NUL.  */
 
   slash = strrchr (path, '/');
+  if (BACKSLASH_IS_PATH_SEPARATOR)
+    {
+      char *b = strrchr (path, '\\');
+      if (b && slash < b)
+	slash = b;
+    }
+
+  /* If the last byte of PATH is a slash, decrement SLASH until it's
+     pointing at the leftmost in a sequence of trailing slashes.  */
+  if (slash && slash[1] == 0)
+    {
+      while (path < slash && ISSLASH (slash[-1]))
+	{
+	  --slash;
+	}
+
+      if (path < slash)
+	{
+	  slash = memrchr (path, '/', slash - path);
+	  if (BACKSLASH_IS_PATH_SEPARATOR)
+	    {
+	      char *b = memrchr (path, '\\', slash - path);
+	      if (b && slash < b)
+		slash = b;
+	    }
+	}
+    }
+
   if (slash == 0)
     {
       /* File is in the current directory.  */
@@ -57,24 +97,86 @@ dir_name (const char *path)
   else
     {
       /* Remove any trailing slashes from the result.  */
-#ifdef MSDOS
-      char *lim = (path[0] >= 'A' && path[0] <= 'z' && path[1] == ':')
-		  ? path + 2 : path;
+      if (BACKSLASH_IS_PATH_SEPARATOR)
+	{
+	  const char *lim = ((path[0] >= 'A' && path[0] <= 'z'
+			      && path[1] == ':')
+			     ? path + 2 : path);
 
-      /* If canonicalized "d:/path", leave alone the root case "d:/".  */
-      while (slash > lim && *slash == '/')
-	--slash;
-#else
-      while (slash > path && *slash == '/')
-	--slash;
-#endif
+	  /* If canonicalized "d:/path", leave alone the root case "d:/".  */
+	  while (slash > lim && ISSLASH (*slash))
+	    --slash;
+	}
+      else
+	{
+	  while (slash > path && ISSLASH (*slash))
+	    --slash;
+	}
 
       length = slash - path + 1;
     }
-  newpath = (char *) malloc (length + 1);
+
+  *result = path;
+  return length;
+}
+
+/* Return the leading directories part of PATH,
+   allocated with malloc.  If out of memory, return 0.
+   Works properly even if there are trailing slashes
+   (by effectively ignoring them).  */
+
+char *
+dir_name (const char *path)
+{
+  const char *result;
+  size_t length = dir_name_r (path, &result);
+  char *newpath = (char *) malloc (length + 1);
   if (newpath == 0)
     return 0;
-  strncpy (newpath, path, length);
+  strncpy (newpath, result, length);
   newpath[length] = 0;
   return newpath;
 }
+
+#ifdef TEST_DIRNAME
+/*
+
+Run the test like this (expect no output):
+  gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall memrchr.c dirname.c
+  sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
+
+BEGIN-DATA
+foo//// .
+bar/foo//// bar
+foo/ .
+/ /
+. .
+a .
+END-DATA
+
+*/
+
+# define MAX_BUFF_LEN 1024
+# include <stdio.h>
+# include <stdlib.h>
+
+int
+main ()
+{
+  char buff[MAX_BUFF_LEN + 1];
+
+  buff[MAX_BUFF_LEN] = 0;
+  while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
+    {
+      char path[MAX_BUFF_LEN];
+      char expected_result[MAX_BUFF_LEN];
+      char *result;
+      sscanf (buff, "%s %s", path, expected_result);
+      result = dir_name (path);
+      if (strcmp (result, expected_result))
+	printf ("%s: got %s, expected %s\n", path, result, expected_result);
+    }
+  exit (0);
+
+}
+#endif