1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <string.h>
19
20 #undef strrchr
21
22 #ifndef STRRCHR
23 # define STRRCHR strrchr
24 #endif
25
26 /* Find the last occurrence of C in S. */
27 char *
STRRCHR(const char * s,int c)28 STRRCHR (const char *s, int c)
29 {
30 const char *found, *p;
31
32 c = (unsigned char) c;
33
34 /* Since strchr is fast, we use it rather than the obvious loop. */
35
36 if (c == '\0')
37 return strchr (s, '\0');
38
39 found = NULL;
40 while ((p = strchr (s, c)) != NULL)
41 {
42 found = p;
43 s = p + 1;
44 }
45
46 return (char *) found;
47 }
48
49 #ifdef weak_alias
50 #undef rindex
51 weak_alias (strrchr, rindex)
52 #endif
53 libc_hidden_builtin_def (strrchr)
54