1 /* dirname.c -- return all but the last element in a file name
2
3 Copyright (C) 1990, 1998, 2000, 2001, 2003, 2004, 2005 Free Software
4 Foundation, Inc.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20 #ifdef HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23
24 #include "dirname.h"
25
26 #include <string.h>
27 #include "xalloc.h"
28
29 /* Return the length of `dirname (FILE)', or zero if FILE is
30 in the working directory. Works properly even if
31 there are trailing slashes (by effectively ignoring them). */
32 size_t
dir_len(char const * file)33 dir_len (char const *file)
34 {
35 size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
36 size_t length;
37
38 /* Strip the basename and any redundant slashes before it. */
39 for (length = base_name (file) - file; prefix_length < length; length--)
40 if (! ISSLASH (file[length - 1]))
41 return length;
42
43 /* But don't strip the only slash from "/". */
44 return prefix_length + ISSLASH (file[prefix_length]);
45 }
46
47 /* Return the leading directories part of FILE,
48 allocated with xmalloc.
49 Works properly even if there are trailing slashes
50 (by effectively ignoring them). */
51
52 char *
dir_name(char const * file)53 dir_name (char const *file)
54 {
55 size_t length = dir_len (file);
56 bool append_dot = (length == FILE_SYSTEM_PREFIX_LEN (file));
57 char *dir = xmalloc (length + append_dot + 1);
58 memcpy (dir, file, length);
59 if (append_dot)
60 dir[length++] = '.';
61 dir[length] = 0;
62 return dir;
63 }
64
65 #ifdef TEST_DIRNAME
66 /*
67
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 error.c
71 sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out
72
73 If it's been built on a DOS or Windows platforms, run another test like
74 this (again, expect no output):
75 sed -n '/^BEGIN-DOS-DATA$/,/^END-DOS-DATA$/p' dirname.c|grep -v DATA|./a.out
76
77 BEGIN-DATA
78 foo//// .
79 bar/foo//// bar
80 foo/ .
81 / /
82 . .
83 a .
84 END-DATA
85
86 BEGIN-DOS-DATA
87 c:///// c:/
88 c:/ c:/
89 c:/. c:/
90 c:foo c:.
91 c:foo/bar c:foo
92 END-DOS-DATA
93
94 */
95
96 # define MAX_BUFF_LEN 1024
97 # include <stdio.h>
98
99 char *program_name;
100
101 int
main(int argc,char * argv[])102 main (int argc, char *argv[])
103 {
104 char buff[MAX_BUFF_LEN + 1];
105
106 program_name = argv[0];
107
108 buff[MAX_BUFF_LEN] = 0;
109 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
110 {
111 char file[MAX_BUFF_LEN];
112 char expected_result[MAX_BUFF_LEN];
113 char const *result;
114 sscanf (buff, "%s %s", file, expected_result);
115 result = dir_name (file);
116 if (strcmp (result, expected_result))
117 printf ("%s: got %s, expected %s\n", file, result, expected_result);
118 }
119 return 0;
120 }
121 #endif
122