-/* dirname.c -- return all but the last element in a path
- Copyright (C) 1990, 1998, 2000 Free Software Foundation, Inc.
+/* dirname.c -- return all but the last element in a file name
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1990, 1998, 2000, 2001, 2003, 2004, 2005, 2006, 2009
+ 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.
+ the Free Software Foundation; either version 3 of the License, 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
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. */
-
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-#else
-char *malloc ();
-#endif
-#if defined STDC_HEADERS || defined HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-# ifndef strrchr
-# 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
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
#include "dirname.h"
-#ifndef ISSLASH
-# define ISSLASH(C) ((C) == '/')
-#endif
+#include <stdlib.h>
+#include <string.h>
+#include "xalloc.h"
-#define BACKSLASH_IS_PATH_SEPARATOR ISSLASH ('\\')
+/* Return the length of the prefix of FILE that will be used by
+ dir_name. If FILE is in the working directory, this returns zero
+ even though `dir_name (FILE)' will return ".". Works properly even
+ if there are trailing slashes (by effectively ignoring them). */
-/* Return the length of the directory part of PATH.
- Set *RESULT to point to PATH or to `"."', as appropriate. */
size_t
-dir_name_r (const char *path, const char **result)
+dir_len (char const *file)
{
- 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. */
- path = ".";
- length = 1;
- }
- else
- {
- /* Remove any trailing slashes from the result. */
- 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 && ISSLASH (*slash))
- --slash;
- }
- else
- {
- while (slash > path && ISSLASH (*slash))
- --slash;
- }
-
- length = slash - path + 1;
- }
-
- *result = path;
+ size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
+ size_t length;
+
+ /* Advance prefix_length beyond important leading slashes. */
+ prefix_length += (prefix_length != 0
+ ? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
+ && ISSLASH (file[prefix_length]))
+ : (ISSLASH (file[0])
+ ? ((DOUBLE_SLASH_IS_DISTINCT_ROOT
+ && ISSLASH (file[1]) && ! ISSLASH (file[2])
+ ? 2 : 1))
+ : 0));
+
+ /* Strip the basename and any redundant slashes before it. */
+ for (length = last_component (file) - file;
+ prefix_length < length; length--)
+ if (! ISSLASH (file[length - 1]))
+ break;
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, result, length);
- newpath[length] = 0;
- return newpath;
-}
-#ifdef TEST_DIRNAME
-/*
+/* In general, we can't use the builtin `dirname' function if available,
+ since it has different meanings in different environments.
+ In some environments the builtin `dirname' modifies its argument.
-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
+ Return the leading directories part of FILE, allocated with malloc.
+ Works properly even if there are trailing slashes (by effectively
+ ignoring them). Return NULL on failure.
-BEGIN-DATA
-foo//// .
-bar/foo//// bar
-foo/ .
-/ /
-. .
-a .
-END-DATA
+ If lstat (FILE) would succeed, then { chdir (dir_name (FILE));
+ lstat (base_name (FILE)); } will access the same file. Likewise,
+ if the sequence { chdir (dir_name (FILE));
+ rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE
+ to "foo" in the same directory FILE was in. */
-*/
+char *
+mdir_name (char const *file)
+{
+ size_t length = dir_len (file);
+ bool append_dot = (length == 0
+ || (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
+ && length == FILE_SYSTEM_PREFIX_LEN (file)
+ && file[2] != '\0' && ! ISSLASH (file[2])));
+ char *dir = malloc (length + append_dot + 1);
+ if (!dir)
+ return NULL;
+ memcpy (dir, file, length);
+ if (append_dot)
+ dir[length++] = '.';
+ dir[length] = '\0';
+ return dir;
+}
-# define MAX_BUFF_LEN 1024
-# include <stdio.h>
-# include <stdlib.h>
+/* Just like mdir_name, above, except, rather than
+ returning NULL upon malloc failure, here, we report the
+ "memory exhausted" condition and exit. */
-int
-main ()
+char *
+dir_name (char const *file)
{
- 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);
-
+ char *result = mdir_name (file);
+ if (!result)
+ xalloc_die ();
+ return result;
}
-#endif
projects / gnulib.git / blobdiff