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6a29c58e YQ |
1 | /* basename.c -- return the last element in a file name |
2 | ||
5df4cba6 | 3 | Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2020 Free Software |
6a29c58e YQ |
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 | |
c0c3707f | 17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
6a29c58e YQ |
18 | |
19 | #include <config.h> | |
20 | ||
21 | #include "dirname.h" | |
22 | ||
23 | #include <string.h> | |
24 | ||
25 | /* Return the address of the last file name component of NAME. If | |
26 | NAME has no relative file name components because it is a file | |
27 | system root, return the empty string. */ | |
28 | ||
29 | char * | |
30 | last_component (char const *name) | |
31 | { | |
32 | char const *base = name + FILE_SYSTEM_PREFIX_LEN (name); | |
33 | char const *p; | |
34 | bool saw_slash = false; | |
35 | ||
36 | while (ISSLASH (*base)) | |
37 | base++; | |
38 | ||
39 | for (p = base; *p; p++) | |
40 | { | |
41 | if (ISSLASH (*p)) | |
42 | saw_slash = true; | |
43 | else if (saw_slash) | |
44 | { | |
45 | base = p; | |
46 | saw_slash = false; | |
47 | } | |
48 | } | |
49 | ||
50 | return (char *) base; | |
51 | } | |
52 | ||
53 | /* Return the length of the basename NAME. Typically NAME is the | |
54 | value returned by base_name or last_component. Act like strlen | |
55 | (NAME), except omit all trailing slashes. */ | |
56 | ||
57 | size_t | |
58 | base_len (char const *name) | |
59 | { | |
60 | size_t len; | |
61 | size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name); | |
62 | ||
63 | for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--) | |
64 | continue; | |
65 | ||
66 | if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1 | |
67 | && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2]) | |
68 | return 2; | |
69 | ||
70 | if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len | |
71 | && len == prefix_len && ISSLASH (name[prefix_len])) | |
72 | return prefix_len + 1; | |
73 | ||
74 | return len; | |
75 | } |