/* dirname.c -- return all but the last element in a path
- Copyright (C) 1990 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
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
#ifdef STDC_HEADERS
-#include <stdlib.h>
+# include <stdlib.h>
#else
char *malloc ();
#endif
-#if defined(USG) || defined(STDC_HEADERS)
-#include <string.h>
-#define rindex strrchr
+#if defined STDC_HEADERS || defined HAVE_STRING_H
+# include <string.h>
#else
-#include <strings.h>
+# include <strings.h>
+# ifndef strrchr
+# define strrchr rindex
+# endif
#endif
+#include <assert.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 HAVE_DECL_MEMRCHR
+"this configure-time declaration test was not run"
+#endif
+#if !HAVE_DECL_MEMRCHR
+void *memrchr ();
+#endif
-char *
-dirname (path)
- char *path;
+#include "dirname.h"
+
+#ifndef FILESYSTEM_PREFIX_LEN
+# define FILESYSTEM_PREFIX_LEN(Filename) 0
+#endif
+
+#ifndef ISSLASH
+# define ISSLASH(C) ((C) == '/')
+#endif
+
+#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).
+ WARNING: This function doesn't work for cwd-relative names like
+ `a:foo' that are specified with a drive-letter prefix. That case
+ is handled in the caller. */
+static size_t
+dir_name_r (char const *path, char const **result)
{
- char *newpath;
- char *slash;
- int length; /* Length of result, not including NUL. */
+ char const *slash;
+ size_t length; /* Length of result, not including NUL. */
+
+ slash = strrchr (path, '/');
+ if (BACKSLASH_IS_PATH_SEPARATOR)
+ {
+ char const *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)
+ {
+ size_t len = slash - path;
+ slash = memrchr (path, '/', len);
+ if (BACKSLASH_IS_PATH_SEPARATOR)
+ {
+ char const *b = memrchr (path, '\\', len);
+ if (b && slash < b)
+ slash = b;
+ }
+ }
+ }
- slash = rindex (path, '/');
if (slash == 0)
{
/* File is in the current directory. */
- path = ".";
- length = 1;
+
+ length = FILESYSTEM_PREFIX_LEN (path);
+
+ if (length == 0)
+ {
+ path = ".";
+ length = 1;
+ }
}
else
{
- /* Remove any trailing slashes from the result. */
- while (slash > path && *slash == '/')
+ /* Remove any trailing slashes from the result. If we have a
+ canonicalized "d:/path", leave alone the root case "d:/". */
+ char const *lim = path + FILESYSTEM_PREFIX_LEN (path);
+
+ while (lim < slash && ISSLASH (*slash))
--slash;
length = slash - path + 1;
}
- newpath = 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 (char const *path)
+{
+ char const *result;
+ size_t length = dir_name_r (path, &result);
+ int append_dot = (length && length == FILESYSTEM_PREFIX_LEN (newpath));
+ char *newpath = (char *) malloc (length + append_dot + 1);
if (newpath == 0)
return 0;
- strncpy (newpath, path, length);
+ strncpy (newpath, result, length);
+ /* If PATH is "d:foo", return "d:.", the CWD on drive d: */
+ if (append_dot)
+ newpath[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 const *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