mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/*-
|
|
* Copyright (c) 1988, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)genbsubs.c 8.1 (Berkeley) 6/6/93";
|
|
#endif /* not lint */
|
|
|
|
/* The output of bunequal is the offset of the byte which didn't match;
|
|
* if all the bytes match, then we return n.
|
|
* bunequal(s1, s2, n) */
|
|
|
|
int
|
|
bunequal(s1, s2, n)
|
|
register char *s1, *s2;
|
|
register n;
|
|
{
|
|
register int i = 0;
|
|
|
|
while (i++ < n) {
|
|
if (*s1++ != *s2++) {
|
|
break;
|
|
}
|
|
}
|
|
return(i-1);
|
|
}
|
|
|
|
/* bskip(s1, n, b) : finds the first occurrence of any byte != 'b' in the 'n'
|
|
* bytes beginning at 's1'.
|
|
*/
|
|
|
|
int
|
|
bskip(s1, n, b)
|
|
register char *s1;
|
|
register int n;
|
|
register int b;
|
|
{
|
|
register int i = 0;
|
|
|
|
while (i++ < n) {
|
|
if (*s1++ != b) {
|
|
break;
|
|
}
|
|
}
|
|
return(i-1);
|
|
}
|
|
|
|
/*
|
|
* memNSchr(const void *s, int c, size_t n, int and)
|
|
*
|
|
* Like memchr, but the comparison is '((*s)&and) == c',
|
|
* and we increment our way through s by "stride" ('s += stride').
|
|
*
|
|
* We optimize for the most used strides of +1 and -1.
|
|
*/
|
|
|
|
unsigned char *
|
|
memNSchr(s, c, n, and, stride)
|
|
char *s;
|
|
int c;
|
|
unsigned int n;
|
|
int and;
|
|
int stride;
|
|
{
|
|
register unsigned char _c, *_s, _and;
|
|
|
|
_and = and;
|
|
_c = (c&_and);
|
|
_s = (unsigned char *)s;
|
|
switch (stride) {
|
|
case 1:
|
|
while (n--) {
|
|
if (((*_s)&_and) == _c) {
|
|
return _s;
|
|
}
|
|
_s++;
|
|
}
|
|
break;
|
|
case -1:
|
|
while (n--) {
|
|
if (((*_s)&_and) == _c) {
|
|
return _s;
|
|
}
|
|
_s--;
|
|
}
|
|
break;
|
|
default:
|
|
while (n--) {
|
|
if (((*_s)&_and) == _c) {
|
|
return _s;
|
|
}
|
|
_s += stride;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|