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Annotation of embedaddon/curl/lib/curl_memrchr.c, revision 1.1.1.1

1.1       misho       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 */