/src/curl/lib/curl_memrchr.c
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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 * |
47 | | Curl_memrchr(const void *s, int c, size_t n) |
48 | 0 | { |
49 | 0 | if(n > 0) { |
50 | 0 | const unsigned char *p = s; |
51 | 0 | const unsigned char *q = s; |
52 | |
|
53 | 0 | p += n - 1; |
54 | |
|
55 | 0 | while(p >= q) { |
56 | 0 | if(*p == (unsigned char)c) |
57 | 0 | return (void *)p; |
58 | 0 | p--; |
59 | 0 | } |
60 | 0 | } |
61 | 0 | return NULL; |
62 | 0 | } |
63 | | |
64 | | #endif /* HAVE_MEMRCHR */ |