43fa6fe319
identifier namespace by renaming non standard functions and variables such that they have a leading underscore. The library will use those names internally. Weak aliases are used to provide the original names to the API. This is only the first part of this change. It is most of the functions which are implemented in C for all NetBSD ports. Subsequent changes are to add the same support to the remaining C files, to assembly files, and to the automagically generated assembly source used for system calls. When all of the above is done, ports with weak alias support should add a definition for __weak_alias to <sys/cdefs.h>.
234 lines
6.4 KiB
C
234 lines
6.4 KiB
C
/* $NetBSD: bm.c,v 1.6 1997/07/21 14:09:07 jtc Exp $ */
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/*-
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* Copyright (c) 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Andrew Hume of AT&T Bell Laboratories.
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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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)bm.c 8.7 (Berkeley) 6/21/94";
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#else
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__RCSID("$NetBSD: bm.c,v 1.6 1997/07/21 14:09:07 jtc Exp $");
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#endif
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#endif /* LIBC_SCCS && not lint */
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#include "namespace.h"
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#include <sys/types.h>
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#include <bm.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef __weak_alias
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__weak_alias(bm_comp,_bm_comp);
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__weak_alias(bm_exec,_bm_exec);
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__weak_alias(bm_free,_bm_free);
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#endif
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/*
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* XXX
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* The default frequency table starts at 99 and counts down. The default
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* table should probably be oriented toward text, and will necessarily be
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* locale specific. This one is for English. It was derived from the
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* OSF/1 and 4.4BSD formatted and unformatted manual pages, and about 100Mb
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* of email and random text. Change it if you can find something better.
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*/
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static u_char const freq_def[256] = {
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 77, 90, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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99, 28, 42, 27, 16, 14, 20, 51,
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66, 65, 59, 24, 75, 76, 84, 56,
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72, 74, 64, 55, 54, 47, 41, 37,
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44, 61, 70, 43, 23, 53, 49, 22,
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33, 58, 40, 46, 45, 57, 60, 26,
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30, 63, 21, 12, 32, 50, 38, 39,
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34, 11, 48, 67, 62, 35, 15, 29,
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71, 18, 9, 17, 25, 13, 10, 52,
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36, 95, 78, 86, 87, 98, 82, 80,
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88, 94, 19, 68, 89, 83, 93, 96,
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81, 7, 91, 92, 97, 85, 69, 73,
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31, 79, 8, 5, 4, 6, 3, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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};
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bm_pat *
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bm_comp(pb, len, freq)
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u_char const *pb;
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size_t len;
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u_char const *freq;
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{
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register u_char const *pe, *p;
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register size_t *d, r;
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register int j;
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int sv_errno;
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bm_pat *pat;
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if (len == 0) {
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errno = EINVAL;
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return (NULL);
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}
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if ((pat = malloc(sizeof(*pat))) == NULL)
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return (NULL);
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pat->pat = NULL;
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pat->delta = NULL;
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pat->patlen = len; /* copy pattern */
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if ((pat->pat = malloc(pat->patlen)) == NULL)
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goto mem;
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memcpy(pat->pat, pb, pat->patlen);
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/* get skip delta */
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if ((pat->delta = malloc(256 * sizeof(*d))) == NULL)
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goto mem;
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for (j = 0, d = pat->delta; j < 256; j++)
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d[j] = pat->patlen;
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for (pe = pb + pat->patlen - 1; pb <= pe; pb++)
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d[*pb] = pe - pb;
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if (freq == NULL) /* default freq table */
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freq = freq_def;
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r = 0; /* get guard */
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for (pb = pat->pat, pe = pb + pat->patlen - 1; pb < pe; pb++)
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if (freq[*pb] < freq[pat->pat[r]])
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r = pb - pat->pat;
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pat->rarec = pat->pat[r];
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pat->rareoff = r - (pat->patlen - 1);
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/* get md2 shift */
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for (pe = pat->pat + pat->patlen - 1, p = pe - 1; p >= pat->pat; p--)
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if (*p == *pe)
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break;
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/* *p is first leftward reoccurrence of *pe */
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pat->md2 = pe - p;
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return (pat);
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mem: sv_errno = errno;
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bm_free(pat);
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errno = sv_errno;
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return (NULL);
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}
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void
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bm_free(pat)
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bm_pat *pat;
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{
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if (pat->pat != NULL)
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free(pat->pat);
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if (pat->delta != NULL)
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free(pat->delta);
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free(pat);
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}
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u_char *
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bm_exec(pat, base, n)
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bm_pat *pat;
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u_char *base;
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size_t n;
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{
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register u_char *e, *ep, *p, *q, *s;
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register size_t *d0, k, md2, n1, ro;
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register int rc;
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if (n == 0)
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return (NULL);
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d0 = pat->delta;
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n1 = pat->patlen - 1;
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md2 = pat->md2;
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ro = pat->rareoff;
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rc = pat->rarec;
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ep = pat->pat + pat->patlen - 1;
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s = base + (pat->patlen - 1);
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/* fast loop up to n - 3 * patlen */
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e = base + n - 3 * pat->patlen;
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while (s < e) {
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k = d0[*s]; /* ufast skip loop */
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while (k) {
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k = d0[*(s += k)];
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k = d0[*(s += k)];
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}
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if (s >= e)
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break;
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if (s[ro] != rc) /* guard test */
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goto mismatch1;
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/* fwd match */
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for (p = pat->pat, q = s - n1; p < ep;)
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if (*q++ != *p++)
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goto mismatch1;
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return (s - n1);
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mismatch1: s += md2; /* md2 shift */
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}
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/* slow loop up to end */
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e = base + n;
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while (s < e) {
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s += d0[*s]; /* step */
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if (s >= e)
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break;
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if (s[ro] != rc) /* guard test */
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goto mismatch2;
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/* fwd match */
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for (p = pat->pat, q = s - n1; p <= ep;)
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if (*q++ != *p++)
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goto mismatch2;
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return (s - n1);
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mismatch2: s += md2; /* md2 shift */
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}
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return (NULL);
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}
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