1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2015, 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 http://curl.haxx.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 ***************************************************************************/
22
23 #include "curl_setup.h"
24 #include "curl_memrchr.h"
25 #include "curl_memory.h"
26
27 /* The last #include file should be: */
28 #include "memdebug.h"
29
30 #ifndef HAVE_MEMRCHR
31
32 /*
33 * Curl_memrchr()
34 *
35 * Our memrchr() function clone for systems which lack this function. The
36 * memrchr() function is like the memchr() function, except that it searches
37 * backwards from the end of the n bytes pointed to by s instead of forward
38 * from the beginning.
39 */
40
41 void *
Curl_memrchr(const void * s,int c,size_t n)42 Curl_memrchr(const void *s, int c, size_t n)
43 {
44 const unsigned char *p = s;
45 const unsigned char *q = s;
46
47 p += n - 1;
48
49 while(p >= q) {
50 if(*p == (unsigned char)c)
51 return (void *)p;
52 p--;
53 }
54
55 return NULL;
56 }
57
58 #endif /* HAVE_MEMRCHR */
59