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Annotation of embedaddon/sudo/compat/memrchr.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2007, 2010-2011 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16: 
        !            17: #include <config.h>
        !            18: 
        !            19: #include <sys/types.h>
        !            20: 
        !            21: #include "missing.h"
        !            22: 
        !            23: /*
        !            24:  * Reverse memchr()
        !            25:  * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
        !            26:  */
        !            27: void *
        !            28: memrchr(const void *s, int c, size_t n)
        !            29: {
        !            30:     const unsigned char *cp;
        !            31: 
        !            32:     if (n != 0) {
        !            33:        cp = (unsigned char *)s + n;
        !            34:        do {
        !            35:            if (*(--cp) == (unsigned char)c)
        !            36:                return (void *)cp;
        !            37:        } while (--n != 0);
        !            38:     }
        !            39:     return (void *)0;
        !            40: }