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

1.1     ! millert     1: /*
        !             2:  * Copyright (c) 1999, 2001 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  *
        !             9:  * 1. Redistributions of source code must retain the above copyright
        !            10:  *    notice, this list of conditions and the following disclaimer.
        !            11:  *
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * 3. The name of the author may not be used to endorse or promote products
        !            17:  *    derived from this software without specific prior written permission.
        !            18:  *
        !            19:  * 4. Products derived from this software may not be called "Sudo" nor
        !            20:  *    may "Sudo" appear in their names without specific prior written
        !            21:  *    permission from the author.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
        !            24:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
        !            25:  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
        !            26:  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
        !            27:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
        !            28:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
        !            29:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
        !            30:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
        !            31:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
        !            32:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
        !            33:  */
        !            34:
        !            35: #include <sys/types.h>
        !            36:
        !            37: #include "config.h"
        !            38:
        !            39: #ifndef lint
        !            40: static const char rcsid[] = "$Sudo: zero_bytes.c,v 1.1 2003/12/31 22:46:08 millert Exp $";
        !            41: #endif /* lint */
        !            42:
        !            43: /*
        !            44:  * Like bzero(3) but with a volatile pointer.  The hope is that
        !            45:  * the compiler will not be able to optimize away this function.
        !            46:  */
        !            47: void
        !            48: zero_bytes(v, n)
        !            49:     volatile VOID *v;
        !            50:     size_t n;
        !            51: {
        !            52:     volatile char *p, *ep;
        !            53:
        !            54:     for (p = v, ep = p + n; p < ep; p++)
        !            55:        *p = 0;
        !            56:     return;
        !            57: }