|
421
|
1 /* dirname.c -- return all but the last element in a file name
|
|
|
2
|
|
|
3 Copyright (C) 1990, 1998, 2000-2001, 2003-2006, 2009-2010 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 3 of the License, or
|
|
|
9 (at your option) 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, see <http://www.gnu.org/licenses/>. */
|
|
|
18
|
|
|
19 #include <config.h>
|
|
|
20
|
|
|
21 #include "dirname.h"
|
|
|
22
|
|
|
23 #include <stdlib.h>
|
|
|
24 #include <string.h>
|
|
|
25
|
|
|
26 /* Return the length of the prefix of FILE that will be used by
|
|
|
27 dir_name. If FILE is in the working directory, this returns zero
|
|
|
28 even though `dir_name (FILE)' will return ".". Works properly even
|
|
|
29 if there are trailing slashes (by effectively ignoring them). */
|
|
|
30
|
|
|
31 size_t
|
|
|
32 dir_len (char const *file)
|
|
|
33 {
|
|
|
34 size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file);
|
|
|
35 size_t length;
|
|
|
36
|
|
|
37 /* Advance prefix_length beyond important leading slashes. */
|
|
|
38 prefix_length += (prefix_length != 0
|
|
|
39 ? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
|
|
|
40 && ISSLASH (file[prefix_length]))
|
|
|
41 : (ISSLASH (file[0])
|
|
|
42 ? ((DOUBLE_SLASH_IS_DISTINCT_ROOT
|
|
|
43 && ISSLASH (file[1]) && ! ISSLASH (file[2])
|
|
|
44 ? 2 : 1))
|
|
|
45 : 0));
|
|
|
46
|
|
|
47 /* Strip the basename and any redundant slashes before it. */
|
|
|
48 for (length = last_component (file) - file;
|
|
|
49 prefix_length < length; length--)
|
|
|
50 if (! ISSLASH (file[length - 1]))
|
|
|
51 break;
|
|
|
52 return length;
|
|
|
53 }
|
|
|
54
|
|
|
55
|
|
|
56 /* In general, we can't use the builtin `dirname' function if available,
|
|
|
57 since it has different meanings in different environments.
|
|
|
58 In some environments the builtin `dirname' modifies its argument.
|
|
|
59
|
|
|
60 Return the leading directories part of FILE, allocated with malloc.
|
|
|
61 Works properly even if there are trailing slashes (by effectively
|
|
|
62 ignoring them). Return NULL on failure.
|
|
|
63
|
|
|
64 If lstat (FILE) would succeed, then { chdir (dir_name (FILE));
|
|
|
65 lstat (base_name (FILE)); } will access the same file. Likewise,
|
|
|
66 if the sequence { chdir (dir_name (FILE));
|
|
|
67 rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE
|
|
|
68 to "foo" in the same directory FILE was in. */
|
|
|
69
|
|
|
70 char *
|
|
|
71 mdir_name (char const *file)
|
|
|
72 {
|
|
|
73 size_t length = dir_len (file);
|
|
|
74 bool append_dot = (length == 0
|
|
|
75 || (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
|
|
|
76 && length == FILE_SYSTEM_PREFIX_LEN (file)
|
|
|
77 && file[2] != '\0' && ! ISSLASH (file[2])));
|
|
|
78 char *dir = malloc (length + append_dot + 1);
|
|
|
79 if (!dir)
|
|
|
80 return NULL;
|
|
|
81 memcpy (dir, file, length);
|
|
|
82 if (append_dot)
|
|
|
83 dir[length++] = '.';
|
|
|
84 dir[length] = '\0';
|
|
|
85 return dir;
|
|
|
86 }
|
