1 /* dirname.c -- return all but the last element in a path
2 Copyright 1990, 1998, 2000, 2001 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #if STDC_HEADERS || HAVE_STRING_H
29 /* Return the length of `dirname (PATH)', or zero if PATH is
30 in the working directory. Works properly even if
31 there are trailing slashes (by effectively ignoring them). */
33 dir_len (char const *path)
35 size_t prefix_length = FILESYSTEM_PREFIX_LEN (path);
38 /* Strip the basename and any redundant slashes before it. */
39 for (length = base_name (path) - path; prefix_length < length; length--)
40 if (! ISSLASH (path[length - 1]))
43 /* But don't strip the only slash from "/". */
44 return prefix_length + ISSLASH (path[prefix_length]);
47 /* Return the leading directories part of PATH,
48 allocated with xmalloc.
49 Works properly even if there are trailing slashes
50 (by effectively ignoring them). */
53 dir_name (char const *path)
55 size_t length = dir_len (path);
56 int append_dot = (length == FILESYSTEM_PREFIX_LEN (path));
57 char *newpath = xmalloc (length + append_dot + 1);
58 memcpy (newpath, path, length);
60 newpath[length++] = '.';
68 Run the test like this (expect no output):
69 gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \
70 basename.c dirname.c xmalloc.c
71 sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
84 # define MAX_BUFF_LEN 1024
90 char buff[MAX_BUFF_LEN + 1];
92 buff[MAX_BUFF_LEN] = 0;
93 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
95 char path[MAX_BUFF_LEN];
96 char expected_result[MAX_BUFF_LEN];
98 sscanf (buff, "%s %s", path, expected_result);
99 result = dir_name (path);
100 if (strcmp (result, expected_result))
101 printf ("%s: got %s, expected %s\n", path, result, expected_result);