1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25 #include "curl_setup.h"
26
27 #include <curl/curl.h>
28
29 #include "curl_memrchr.h"
30 #include "curl_memory.h"
31
32 /* The last #include file should be: */
33 #include "memdebug.h"
34
35 #ifndef HAVE_MEMRCHR
36
37 /*
38 * Curl_memrchr()
39 *
40 * Our memrchr() function clone for systems which lack this function. The
41 * memrchr() function is like the memchr() function, except that it searches
42 * backwards from the end of the n bytes pointed to by s instead of forward
43 * from the beginning.
44 */
45
46 void *
Curl_memrchr(const void * s,int c,size_t n)47 Curl_memrchr(const void *s, int c, size_t n)
48 {
49 if(n > 0) {
50 const unsigned char *p = s;
51 const unsigned char *q = s;
52
53 p += n - 1;
54
55 while(p >= q) {
56 if(*p == (unsigned char)c)
57 return (void *)p;
58 p--;
59 }
60 }
61 return NULL;
62 }
63
64 #endif /* HAVE_MEMRCHR */
65
