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1 | /* Return basename of given pathname according to the weird XPG specification. | |
2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library 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 GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <string.h> | |
21 | #include <libgen.h> | |
22 | ||
23 | ||
24 | char * | |
25 | __xpg_basename (char *filename) | |
26 | { | |
27 | char *p; | |
28 | ||
29 | if (filename == NULL || filename[0] == '\0') | |
30 | /* We return a pointer to a static string containing ".". */ | |
31 | p = (char *) "."; | |
32 | else | |
33 | { | |
34 | p = strrchr (filename, '/'); | |
35 | ||
36 | if (p == NULL) | |
37 | /* There is no slash in the filename. Return the whole string. */ | |
38 | p = filename; | |
39 | else | |
40 | { | |
41 | if (p[1] == '\0') | |
42 | { | |
43 | /* We must remove trailing '/'. */ | |
44 | while (p > filename && p[-1] == '/') | |
45 | --p; | |
46 | ||
47 | /* Now we can be in two situations: | |
48 | a) the string only contains '/' characters, so we return | |
49 | '/' | |
50 | b) p points past the last component, but we have to remove | |
51 | the trailing slash. */ | |
52 | if (p > filename) | |
53 | { | |
54 | *p-- = '\0'; | |
55 | while (p > filename && p[-1] != '/') | |
56 | --p; | |
57 | } | |
58 | else | |
59 | /* The last slash we already found is the right position | |
60 | to return. */ | |
61 | while (p[1] != '\0') | |
62 | ++p; | |
63 | } | |
64 | else | |
65 | /* Go to the first character of the name. */ | |
66 | ++p; | |
67 | } | |
68 | } | |
69 | ||
70 | return p; | |
71 | } |