Return to memrchr.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / sudo / compat

Initial revision

    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: }