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Annotation of src/usr.bin/sudo/memrchr.c, Revision 1.1

1.1     ! millert     1: /*
        !             2:  * Copyright (c) 2007 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 <sys/types.h>
        !            18: #include <config.h>
        !            19: #include <compat.h>
        !            20:
        !            21: #ifndef lint
        !            22: __unused static const char rcsid[] = "$Sudo: memrchr.c,v 1.1.2.2 2007/06/19 21:00:35 millert Exp $";
        !            23: #endif /* lint */
        !            24:
        !            25: #include <sys/types.h>
        !            26: #include <config.h>
        !            27:
        !            28: /*
        !            29:  * Reverse memchr()
        !            30:  * Find the last occurence of 'c' in the buffer 's' of size 'n'.
        !            31:  */
        !            32: VOID *
        !            33: memrchr(s, c, n)
        !            34:     const VOID *s;
        !            35:     int c;
        !            36:     size_t n;
        !            37: {
        !            38:     const unsigned char *cp;
        !            39:
        !            40:     if (n != 0) {
        !            41:        cp = (unsigned char *)s + n;
        !            42:        do {
        !            43:            if (*(--cp) == (unsigned char)c)
        !            44:                return((VOID *)cp);
        !            45:        } while (--n != 0);
        !            46:     }
        !            47:     return((VOID *)0);
        !            48: }