1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 1998 - 2018, 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.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 | |
25 | #include <curl/curl.h> |
26 | |
27 | #include "curl_memrchr.h" |
28 | #include "curl_memory.h" |
29 | |
30 | /* The last #include file should be: */ |
31 | #include "memdebug.h" |
32 | |
33 | #ifndef HAVE_MEMRCHR |
34 | |
35 | /* |
36 | * Curl_memrchr() |
37 | * |
38 | * Our memrchr() function clone for systems which lack this function. The |
39 | * memrchr() function is like the memchr() function, except that it searches |
40 | * backwards from the end of the n bytes pointed to by s instead of forward |
41 | * from the beginning. |
42 | */ |
43 | |
44 | void * |
45 | Curl_memrchr(const void *s, int c, size_t n) |
46 | { |
47 | if(n > 0) { |
48 | const unsigned char *p = s; |
49 | const unsigned char *q = s; |
50 | |
51 | p += n - 1; |
52 | |
53 | while(p >= q) { |
54 | if(*p == (unsigned char)c) |
55 | return (void *)p; |
56 | p--; |
57 | } |
58 | } |
59 | return NULL; |
60 | } |
61 | |
62 | #endif /* HAVE_MEMRCHR */ |
63 | |