2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
239 lines
6.2 KiB
C
239 lines
6.2 KiB
C
/* $NetBSD: bm.c,v 1.11 2003/08/07 16:43:47 agc 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. 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 1.11 2003/08/07 16:43:47 agc 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 <assert.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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u_char const *pe, *p;
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size_t *d, r;
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int j;
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int sv_errno;
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bm_pat *pat;
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_DIAGASSERT(pb != NULL);
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/* freq may be NULL */
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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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_DIAGASSERT(pat != NULL);
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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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u_char *e, *ep, *p, *q, *s;
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size_t *d0, k, md2, n1, ro;
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int rc;
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_DIAGASSERT(pat != NULL);
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_DIAGASSERT(base != NULL);
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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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