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