1 | /* basename.c -- return the last element in a file name |
2 | |
3 | Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2019 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 <https://www.gnu.org/licenses/>. */ |
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 | } |
76 | |