* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
232 lines
6.2 KiB
C
232 lines
6.2 KiB
C
/* $NetBSD: bm.c,v 1.12 2012/06/25 22:32:46 abs Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Andrew Hume of AT&T Bell Laboratories.
|
|
*
|
|
* 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. 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)bm.c 8.7 (Berkeley) 6/21/94";
|
|
#else
|
|
__RCSID("$NetBSD: bm.c,v 1.12 2012/06/25 22:32:46 abs Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS && not lint */
|
|
|
|
#include "namespace.h"
|
|
#include <sys/types.h>
|
|
|
|
#include <assert.h>
|
|
#include <bm.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(bm_comp,_bm_comp)
|
|
__weak_alias(bm_exec,_bm_exec)
|
|
__weak_alias(bm_free,_bm_free)
|
|
#endif
|
|
|
|
/*
|
|
* XXX
|
|
* The default frequency table starts at 99 and counts down. The default
|
|
* table should probably be oriented toward text, and will necessarily be
|
|
* locale specific. This one is for English. It was derived from the
|
|
* OSF/1 and 4.4BSD formatted and unformatted manual pages, and about 100Mb
|
|
* of email and random text. Change it if you can find something better.
|
|
*/
|
|
static u_char const freq_def[256] = {
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 77, 90, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
99, 28, 42, 27, 16, 14, 20, 51,
|
|
66, 65, 59, 24, 75, 76, 84, 56,
|
|
72, 74, 64, 55, 54, 47, 41, 37,
|
|
44, 61, 70, 43, 23, 53, 49, 22,
|
|
33, 58, 40, 46, 45, 57, 60, 26,
|
|
30, 63, 21, 12, 32, 50, 38, 39,
|
|
34, 11, 48, 67, 62, 35, 15, 29,
|
|
71, 18, 9, 17, 25, 13, 10, 52,
|
|
36, 95, 78, 86, 87, 98, 82, 80,
|
|
88, 94, 19, 68, 89, 83, 93, 96,
|
|
81, 7, 91, 92, 97, 85, 69, 73,
|
|
31, 79, 8, 5, 4, 6, 3, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0,
|
|
};
|
|
|
|
bm_pat *
|
|
bm_comp(u_char const *pb, size_t len, u_char const *freq)
|
|
{
|
|
u_char const *pe, *p;
|
|
size_t *d, r;
|
|
int j;
|
|
int sv_errno;
|
|
bm_pat *pat;
|
|
|
|
_DIAGASSERT(pb != NULL);
|
|
/* freq may be NULL */
|
|
|
|
if (len == 0) {
|
|
errno = EINVAL;
|
|
return (NULL);
|
|
}
|
|
if ((pat = malloc(sizeof(*pat))) == NULL)
|
|
return (NULL);
|
|
pat->pat = NULL;
|
|
pat->delta = NULL;
|
|
|
|
pat->patlen = len; /* copy pattern */
|
|
if ((pat->pat = malloc(pat->patlen)) == NULL)
|
|
goto mem;
|
|
memcpy(pat->pat, pb, pat->patlen);
|
|
/* get skip delta */
|
|
if ((pat->delta = malloc(256 * sizeof(*d))) == NULL)
|
|
goto mem;
|
|
for (j = 0, d = pat->delta; j < 256; j++)
|
|
d[j] = pat->patlen;
|
|
for (pe = pb + pat->patlen - 1; pb <= pe; pb++)
|
|
d[*pb] = pe - pb;
|
|
|
|
if (freq == NULL) /* default freq table */
|
|
freq = freq_def;
|
|
r = 0; /* get guard */
|
|
for (pb = pat->pat, pe = pb + pat->patlen - 1; pb < pe; pb++)
|
|
if (freq[*pb] < freq[pat->pat[r]])
|
|
r = pb - pat->pat;
|
|
pat->rarec = pat->pat[r];
|
|
pat->rareoff = r - (pat->patlen - 1);
|
|
|
|
/* get md2 shift */
|
|
for (pe = pat->pat + pat->patlen - 1, p = pe - 1; p >= pat->pat; p--)
|
|
if (*p == *pe)
|
|
break;
|
|
|
|
/* *p is first leftward reoccurrence of *pe */
|
|
pat->md2 = pe - p;
|
|
return (pat);
|
|
|
|
mem: sv_errno = errno;
|
|
bm_free(pat);
|
|
errno = sv_errno;
|
|
return (NULL);
|
|
}
|
|
|
|
void
|
|
bm_free(bm_pat *pat)
|
|
{
|
|
|
|
_DIAGASSERT(pat != NULL);
|
|
|
|
if (pat->pat != NULL)
|
|
free(pat->pat);
|
|
if (pat->delta != NULL)
|
|
free(pat->delta);
|
|
free(pat);
|
|
}
|
|
|
|
u_char *
|
|
bm_exec(bm_pat *pat, u_char *base, size_t n)
|
|
{
|
|
u_char *e, *ep, *p, *q, *s;
|
|
size_t *d0, k, md2, n1, ro;
|
|
int rc;
|
|
|
|
_DIAGASSERT(pat != NULL);
|
|
_DIAGASSERT(base != NULL);
|
|
|
|
if (n == 0)
|
|
return (NULL);
|
|
|
|
d0 = pat->delta;
|
|
n1 = pat->patlen - 1;
|
|
md2 = pat->md2;
|
|
ro = pat->rareoff;
|
|
rc = pat->rarec;
|
|
ep = pat->pat + pat->patlen - 1;
|
|
s = base + (pat->patlen - 1);
|
|
|
|
/* fast loop up to n - 3 * patlen */
|
|
e = base + n - 3 * pat->patlen;
|
|
while (s < e) {
|
|
k = d0[*s]; /* ufast skip loop */
|
|
while (k) {
|
|
k = d0[*(s += k)];
|
|
k = d0[*(s += k)];
|
|
}
|
|
if (s >= e)
|
|
break;
|
|
if (s[ro] != rc) /* guard test */
|
|
goto mismatch1;
|
|
/* fwd match */
|
|
for (p = pat->pat, q = s - n1; p < ep;)
|
|
if (*q++ != *p++)
|
|
goto mismatch1;
|
|
return (s - n1);
|
|
|
|
mismatch1: s += md2; /* md2 shift */
|
|
}
|
|
|
|
/* slow loop up to end */
|
|
e = base + n;
|
|
while (s < e) {
|
|
s += d0[*s]; /* step */
|
|
if (s >= e)
|
|
break;
|
|
if (s[ro] != rc) /* guard test */
|
|
goto mismatch2;
|
|
/* fwd match */
|
|
for (p = pat->pat, q = s - n1; p <= ep;)
|
|
if (*q++ != *p++)
|
|
goto mismatch2;
|
|
return (s - n1);
|
|
|
|
mismatch2: s += md2; /* md2 shift */
|
|
}
|
|
|
|
return (NULL);
|
|
}
|