127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*-
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* Copyright (c) 1988 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)genbsubs.c 4.2 (Berkeley) 4/26/91";*/
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static char rcsid[] = "$Id: genbsubs.c,v 1.2 1993/08/01 18:05:28 mycroft Exp $";
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#endif /* not lint */
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/* The output of bunequal is the offset of the byte which didn't match;
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* if all the bytes match, then we return n.
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* bunequal(s1, s2, n) */
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int
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bunequal(s1, s2, n)
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register char *s1, *s2;
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register n;
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{
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register int i = 0;
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while (i++ < n) {
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if (*s1++ != *s2++) {
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break;
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}
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}
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return(i-1);
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}
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/* bskip(s1, n, b) : finds the first occurrence of any byte != 'b' in the 'n'
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* bytes beginning at 's1'.
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*/
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int
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bskip(s1, n, b)
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register char *s1;
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register int n;
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register int b;
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{
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register int i = 0;
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while (i++ < n) {
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if (*s1++ != b) {
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break;
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}
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}
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return(i-1);
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}
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/*
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* memNSchr(const void *s, int c, size_t n, int and)
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*
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* Like memchr, but the comparison is '((*s)&and) == c',
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* and we increment our way through s by "stride" ('s += stride').
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*
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* We optimize for the most used strides of +1 and -1.
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*/
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unsigned char *
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memNSchr(s, c, n, and, stride)
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char *s;
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int c;
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unsigned int n;
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int and;
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int stride;
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{
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register unsigned char _c, *_s, _and;
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_and = and;
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_c = (c&_and);
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_s = (unsigned char *)s;
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switch (stride) {
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case 1:
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while (n--) {
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if (((*_s)&_and) == _c) {
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return _s;
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}
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_s++;
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}
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break;
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case -1:
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while (n--) {
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if (((*_s)&_and) == _c) {
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return _s;
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}
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_s--;
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}
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break;
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default:
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while (n--) {
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if (((*_s)&_and) == _c) {
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return _s;
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}
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_s += stride;
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}
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}
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return 0;
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}
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