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 #include <libc-diag.h>
20
21 #ifndef RAWMEMCHR
22 # define RAWMEMCHR __rawmemchr
23 #endif
24
25 /* The pragmata should be nested inside RAWMEMCHR below, but that
26 triggers GCC PR 98512. */
27 DIAG_PUSH_NEEDS_COMMENT;
28 #if __GNUC_PREREQ (7, 0)
29 /* GCC 8 warns about the size passed to memchr being larger than
30 PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
31 DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow=");
32 #endif
33 #if __GNUC_PREREQ (11, 0)
34 /* Likewise GCC 11, with a different warning option. */
35 DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
36 #endif
37
38 /* Find the first occurrence of C in S. */
39 void *
RAWMEMCHR(const void * s,int c)40 RAWMEMCHR (const void *s, int c)
41 {
42 if (c != '\0')
43 return memchr (s, c, (size_t)-1);
44 return (char *)s + strlen (s);
45 }
46 libc_hidden_def (__rawmemchr)
47 weak_alias (__rawmemchr, rawmemchr)
48
49 DIAG_POP_NEEDS_COMMENT;
50