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148 |
jeremybenn |
/*-
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* Copyright (c) 1992, 1993, 1994 Henry Spencer.
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* Copyright (c) 1992, 1993, 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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* Henry Spencer.
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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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* 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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* @(#)engine.c 8.5 (Berkeley) 3/20/94
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*/
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#include <sys/cdefs.h>
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/*
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* The matching engine and friends. This file is #included by regexec.c
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* after suitable #defines of a variety of macros used herein, so that
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* different state representations can be used without duplicating masses
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* of code.
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*/
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#ifdef SNAMES
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#define matcher smatcher
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#define fast sfast
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#define slow sslow
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#define dissect sdissect
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#define backref sbackref
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#define step sstep
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#define print sprint
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#define at sat
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#define match smat
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#endif
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#ifdef LNAMES
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#define matcher lmatcher
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#define fast lfast
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#define slow lslow
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#define dissect ldissect
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#define backref lbackref
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#define step lstep
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#define print lprint
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#define at lat
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#define match lmat
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#endif
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/* another structure passed up and down to avoid zillions of parameters */
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struct match {
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struct re_guts *g;
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int eflags;
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regmatch_t *pmatch; /* [nsub+1] (0 element unused) */
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char *offp; /* offsets work from here */
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char *beginp; /* start of string -- virtual NUL precedes */
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char *endp; /* end of string -- virtual NUL here */
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char *coldp; /* can be no match starting before here */
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char **lastpos; /* [nplus+1] */
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STATEVARS;
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states st; /* current states */
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states fresh; /* states for a fresh start */
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states tmp; /* temporary */
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states empty; /* empty set of states */
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};
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/* ========= begin header generated by ./mkh ========= */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* === engine.c === */
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static int matcher(struct re_guts *g, char *string, size_t nmatch, regmatch_t pmatch[], int eflags);
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static char *dissect(struct match *m, char *start, char *stop, sopno startst, sopno stopst);
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static char *backref(struct match *m, char *start, char *stop, sopno startst, sopno stopst, sopno lev);
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static char *fast(struct match *m, char *start, char *stop, sopno startst, sopno stopst);
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static char *slow(struct match *m, char *start, char *stop, sopno startst, sopno stopst);
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static states step(struct re_guts *g, sopno start, sopno stop, states bef, int ch, states aft);
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#define BOL (OUT+1)
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#define EOL (BOL+1)
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#define BOLEOL (BOL+2)
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#define NOTHING (BOL+3)
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#define BOW (BOL+4)
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#define EOW (BOL+5)
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#define CODEMAX (BOL+5) /* highest code used */
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#define NONCHAR(c) ((c) > CHAR_MAX)
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#define NNONCHAR (CODEMAX-CHAR_MAX)
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#ifdef REDEBUG
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static void print(struct match *m, char *caption, states st, int ch, FILE *d);
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#endif
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#ifdef REDEBUG
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static void at(struct match *m, char *title, char *start, char *stop, sopno startst, sopno stopst);
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#endif
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#ifdef REDEBUG
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static char *pchar(int ch);
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#endif
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#ifdef __cplusplus
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}
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#endif
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/* ========= end header generated by ./mkh ========= */
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#ifdef REDEBUG
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#define SP(t, s, c) print(m, t, s, c, stdout)
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#define AT(t, p1, p2, s1, s2) at(m, t, p1, p2, s1, s2)
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#define NOTE(str) { if (m->eflags®_TRACE) printf("=%s\n", (str)); }
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#else
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#define SP(t, s, c) /* nothing */
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#define AT(t, p1, p2, s1, s2) /* nothing */
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#define NOTE(s) /* nothing */
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#endif
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/*
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- matcher - the actual matching engine
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== static int matcher(struct re_guts *g, char *string, \
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== size_t nmatch, regmatch_t pmatch[], int eflags);
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*/
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static int /* 0 success, REG_NOMATCH failure */
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matcher(g, string, nmatch, pmatch, eflags)
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struct re_guts *g;
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char *string;
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size_t nmatch;
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regmatch_t pmatch[];
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int eflags;
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{
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char *endp;
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int i;
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struct match mv;
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struct match *m = &mv;
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char *dp;
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const sopno gf = g->firststate+1; /* +1 for OEND */
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const sopno gl = g->laststate;
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char *start;
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char *stop;
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/* Boyer-Moore algorithms variables */
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char *pp;
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int cj, mj;
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char *mustfirst;
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char *mustlast;
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int *matchjump;
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int *charjump;
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/* simplify the situation where possible */
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if (g->cflags®_NOSUB)
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nmatch = 0;
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if (eflags®_STARTEND) {
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start = string + pmatch[0].rm_so;
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stop = string + pmatch[0].rm_eo;
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} else {
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start = string;
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stop = start + strlen(start);
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}
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if (stop < start)
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return(REG_INVARG);
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/* prescreening; this does wonders for this rather slow code */
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if (g->must != NULL) {
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if (g->charjump != NULL && g->matchjump != NULL) {
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mustfirst = g->must;
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mustlast = g->must + g->mlen - 1;
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charjump = g->charjump;
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matchjump = g->matchjump;
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pp = mustlast;
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for (dp = start+g->mlen-1; dp < stop;) {
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/* Fast skip non-matches */
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while (dp < stop && charjump[*dp])
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dp += charjump[*dp];
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if (dp >= stop)
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break;
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/* Greedy matcher */
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/* We depend on not being used for
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* for strings of length 1
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*/
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while (*--dp == *--pp && pp != mustfirst);
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if (*dp == *pp)
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break;
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/* Jump to next possible match */
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mj = matchjump[pp - mustfirst];
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cj = charjump[*dp];
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dp += (cj < mj ? mj : cj);
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pp = mustlast;
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}
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if (pp != mustfirst)
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return(REG_NOMATCH);
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} else {
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for (dp = start; dp < stop; dp++)
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if (*dp == g->must[0] &&
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stop - dp >= g->mlen &&
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memcmp(dp, g->must, (size_t)g->mlen) == 0)
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break;
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if (dp == stop) /* we didn't find g->must */
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return(REG_NOMATCH);
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}
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}
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/* match struct setup */
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m->g = g;
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m->eflags = eflags;
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m->pmatch = NULL;
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m->lastpos = NULL;
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m->offp = string;
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m->beginp = start;
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m->endp = stop;
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STATESETUP(m, 4);
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SETUP(m->st);
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SETUP(m->fresh);
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SETUP(m->tmp);
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SETUP(m->empty);
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CLEAR(m->empty);
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| 232 |
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| 233 |
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/* Adjust start according to moffset, to speed things up */
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if (g->moffset > -1)
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start = ((dp - g->moffset) < start) ? start : dp - g->moffset;
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| 237 |
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/* this loop does only one repetition except for backrefs */
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| 238 |
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for (;;) {
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| 239 |
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endp = fast(m, start, stop, gf, gl);
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| 240 |
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if (endp == NULL) { /* a miss */
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| 241 |
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STATETEARDOWN(m);
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| 242 |
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return(REG_NOMATCH);
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| 243 |
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}
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| 244 |
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if (nmatch == 0 && !g->backrefs)
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| 245 |
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break; /* no further info needed */
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| 246 |
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| 247 |
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/* where? */
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| 248 |
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assert(m->coldp != NULL);
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| 249 |
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for (;;) {
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| 250 |
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NOTE("finding start");
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| 251 |
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endp = slow(m, m->coldp, stop, gf, gl);
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| 252 |
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if (endp != NULL)
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| 253 |
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break;
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| 254 |
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assert(m->coldp < m->endp);
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| 255 |
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m->coldp++;
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| 256 |
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}
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| 257 |
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if (nmatch == 1 && !g->backrefs)
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| 258 |
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break; /* no further info needed */
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| 259 |
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| 260 |
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/* oh my, he wants the subexpressions... */
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| 261 |
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if (m->pmatch == NULL)
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| 262 |
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m->pmatch = (regmatch_t *)malloc((m->g->nsub + 1) *
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| 263 |
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sizeof(regmatch_t));
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| 264 |
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if (m->pmatch == NULL) {
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| 265 |
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STATETEARDOWN(m);
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| 266 |
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return(REG_ESPACE);
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| 267 |
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}
|
| 268 |
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for (i = 1; i <= m->g->nsub; i++)
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| 269 |
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m->pmatch[i].rm_so = m->pmatch[i].rm_eo = -1;
|
| 270 |
|
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if (!g->backrefs && !(m->eflags®_BACKR)) {
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| 271 |
|
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NOTE("dissecting");
|
| 272 |
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dp = dissect(m, m->coldp, endp, gf, gl);
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| 273 |
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} else {
|
| 274 |
|
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if (g->nplus > 0 && m->lastpos == NULL)
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| 275 |
|
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m->lastpos = (char **)malloc((g->nplus+1) *
|
| 276 |
|
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sizeof(char *));
|
| 277 |
|
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if (g->nplus > 0 && m->lastpos == NULL) {
|
| 278 |
|
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free(m->pmatch);
|
| 279 |
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STATETEARDOWN(m);
|
| 280 |
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return(REG_ESPACE);
|
| 281 |
|
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}
|
| 282 |
|
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NOTE("backref dissect");
|
| 283 |
|
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dp = backref(m, m->coldp, endp, gf, gl, (sopno)0);
|
| 284 |
|
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}
|
| 285 |
|
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if (dp != NULL)
|
| 286 |
|
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break;
|
| 287 |
|
|
|
| 288 |
|
|
/* uh-oh... we couldn't find a subexpression-level match */
|
| 289 |
|
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assert(g->backrefs); /* must be back references doing it */
|
| 290 |
|
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assert(g->nplus == 0 || m->lastpos != NULL);
|
| 291 |
|
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for (;;) {
|
| 292 |
|
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if (dp != NULL || endp <= m->coldp)
|
| 293 |
|
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break; /* defeat */
|
| 294 |
|
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NOTE("backoff");
|
| 295 |
|
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endp = slow(m, m->coldp, endp-1, gf, gl);
|
| 296 |
|
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if (endp == NULL)
|
| 297 |
|
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break; /* defeat */
|
| 298 |
|
|
/* try it on a shorter possibility */
|
| 299 |
|
|
#ifndef NDEBUG
|
| 300 |
|
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for (i = 1; i <= m->g->nsub; i++) {
|
| 301 |
|
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assert(m->pmatch[i].rm_so == -1);
|
| 302 |
|
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assert(m->pmatch[i].rm_eo == -1);
|
| 303 |
|
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}
|
| 304 |
|
|
#endif
|
| 305 |
|
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NOTE("backoff dissect");
|
| 306 |
|
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dp = backref(m, m->coldp, endp, gf, gl, (sopno)0);
|
| 307 |
|
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}
|
| 308 |
|
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assert(dp == NULL || dp == endp);
|
| 309 |
|
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if (dp != NULL) /* found a shorter one */
|
| 310 |
|
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break;
|
| 311 |
|
|
|
| 312 |
|
|
/* despite initial appearances, there is no match here */
|
| 313 |
|
|
NOTE("false alarm");
|
| 314 |
|
|
start = m->coldp + 1; /* recycle starting later */
|
| 315 |
|
|
assert(start <= stop);
|
| 316 |
|
|
}
|
| 317 |
|
|
|
| 318 |
|
|
/* fill in the details if requested */
|
| 319 |
|
|
if (nmatch > 0) {
|
| 320 |
|
|
pmatch[0].rm_so = m->coldp - m->offp;
|
| 321 |
|
|
pmatch[0].rm_eo = endp - m->offp;
|
| 322 |
|
|
}
|
| 323 |
|
|
if (nmatch > 1) {
|
| 324 |
|
|
assert(m->pmatch != NULL);
|
| 325 |
|
|
for (i = 1; i < nmatch; i++)
|
| 326 |
|
|
if (i <= m->g->nsub)
|
| 327 |
|
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pmatch[i] = m->pmatch[i];
|
| 328 |
|
|
else {
|
| 329 |
|
|
pmatch[i].rm_so = -1;
|
| 330 |
|
|
pmatch[i].rm_eo = -1;
|
| 331 |
|
|
}
|
| 332 |
|
|
}
|
| 333 |
|
|
|
| 334 |
|
|
if (m->pmatch != NULL)
|
| 335 |
|
|
free((char *)m->pmatch);
|
| 336 |
|
|
if (m->lastpos != NULL)
|
| 337 |
|
|
free((char *)m->lastpos);
|
| 338 |
|
|
STATETEARDOWN(m);
|
| 339 |
|
|
return(0);
|
| 340 |
|
|
}
|
| 341 |
|
|
|
| 342 |
|
|
/*
|
| 343 |
|
|
- dissect - figure out what matched what, no back references
|
| 344 |
|
|
== static char *dissect(struct match *m, char *start, \
|
| 345 |
|
|
== char *stop, sopno startst, sopno stopst);
|
| 346 |
|
|
*/
|
| 347 |
|
|
static char * /* == stop (success) always */
|
| 348 |
|
|
dissect(m, start, stop, startst, stopst)
|
| 349 |
|
|
struct match *m;
|
| 350 |
|
|
char *start;
|
| 351 |
|
|
char *stop;
|
| 352 |
|
|
sopno startst;
|
| 353 |
|
|
sopno stopst;
|
| 354 |
|
|
{
|
| 355 |
|
|
int i;
|
| 356 |
|
|
sopno ss; /* start sop of current subRE */
|
| 357 |
|
|
sopno es; /* end sop of current subRE */
|
| 358 |
|
|
char *sp; /* start of string matched by it */
|
| 359 |
|
|
char *stp; /* string matched by it cannot pass here */
|
| 360 |
|
|
char *rest; /* start of rest of string */
|
| 361 |
|
|
char *tail; /* string unmatched by rest of RE */
|
| 362 |
|
|
sopno ssub; /* start sop of subsubRE */
|
| 363 |
|
|
sopno esub; /* end sop of subsubRE */
|
| 364 |
|
|
char *ssp; /* start of string matched by subsubRE */
|
| 365 |
|
|
char *sep; /* end of string matched by subsubRE */
|
| 366 |
|
|
char *oldssp; /* previous ssp */
|
| 367 |
|
|
char *dp;
|
| 368 |
|
|
|
| 369 |
|
|
AT("diss", start, stop, startst, stopst);
|
| 370 |
|
|
sp = start;
|
| 371 |
|
|
for (ss = startst; ss < stopst; ss = es) {
|
| 372 |
|
|
/* identify end of subRE */
|
| 373 |
|
|
es = ss;
|
| 374 |
|
|
switch (OP(m->g->strip[es])) {
|
| 375 |
|
|
case OPLUS_:
|
| 376 |
|
|
case OQUEST_:
|
| 377 |
|
|
es += OPND(m->g->strip[es]);
|
| 378 |
|
|
break;
|
| 379 |
|
|
case OCH_:
|
| 380 |
|
|
while (OP(m->g->strip[es]) != O_CH)
|
| 381 |
|
|
es += OPND(m->g->strip[es]);
|
| 382 |
|
|
break;
|
| 383 |
|
|
}
|
| 384 |
|
|
es++;
|
| 385 |
|
|
|
| 386 |
|
|
/* figure out what it matched */
|
| 387 |
|
|
switch (OP(m->g->strip[ss])) {
|
| 388 |
|
|
case OEND:
|
| 389 |
|
|
assert(nope);
|
| 390 |
|
|
break;
|
| 391 |
|
|
case OCHAR:
|
| 392 |
|
|
sp++;
|
| 393 |
|
|
break;
|
| 394 |
|
|
case OBOL:
|
| 395 |
|
|
case OEOL:
|
| 396 |
|
|
case OBOW:
|
| 397 |
|
|
case OEOW:
|
| 398 |
|
|
break;
|
| 399 |
|
|
case OANY:
|
| 400 |
|
|
case OANYOF:
|
| 401 |
|
|
sp++;
|
| 402 |
|
|
break;
|
| 403 |
|
|
case OBACK_:
|
| 404 |
|
|
case O_BACK:
|
| 405 |
|
|
assert(nope);
|
| 406 |
|
|
break;
|
| 407 |
|
|
/* cases where length of match is hard to find */
|
| 408 |
|
|
case OQUEST_:
|
| 409 |
|
|
stp = stop;
|
| 410 |
|
|
for (;;) {
|
| 411 |
|
|
/* how long could this one be? */
|
| 412 |
|
|
rest = slow(m, sp, stp, ss, es);
|
| 413 |
|
|
assert(rest != NULL); /* it did match */
|
| 414 |
|
|
/* could the rest match the rest? */
|
| 415 |
|
|
tail = slow(m, rest, stop, es, stopst);
|
| 416 |
|
|
if (tail == stop)
|
| 417 |
|
|
break; /* yes! */
|
| 418 |
|
|
/* no -- try a shorter match for this one */
|
| 419 |
|
|
stp = rest - 1;
|
| 420 |
|
|
assert(stp >= sp); /* it did work */
|
| 421 |
|
|
}
|
| 422 |
|
|
ssub = ss + 1;
|
| 423 |
|
|
esub = es - 1;
|
| 424 |
|
|
/* did innards match? */
|
| 425 |
|
|
if (slow(m, sp, rest, ssub, esub) != NULL) {
|
| 426 |
|
|
dp = dissect(m, sp, rest, ssub, esub);
|
| 427 |
|
|
assert(dp == rest);
|
| 428 |
|
|
} else /* no */
|
| 429 |
|
|
assert(sp == rest);
|
| 430 |
|
|
sp = rest;
|
| 431 |
|
|
break;
|
| 432 |
|
|
case OPLUS_:
|
| 433 |
|
|
stp = stop;
|
| 434 |
|
|
for (;;) {
|
| 435 |
|
|
/* how long could this one be? */
|
| 436 |
|
|
rest = slow(m, sp, stp, ss, es);
|
| 437 |
|
|
assert(rest != NULL); /* it did match */
|
| 438 |
|
|
/* could the rest match the rest? */
|
| 439 |
|
|
tail = slow(m, rest, stop, es, stopst);
|
| 440 |
|
|
if (tail == stop)
|
| 441 |
|
|
break; /* yes! */
|
| 442 |
|
|
/* no -- try a shorter match for this one */
|
| 443 |
|
|
stp = rest - 1;
|
| 444 |
|
|
assert(stp >= sp); /* it did work */
|
| 445 |
|
|
}
|
| 446 |
|
|
ssub = ss + 1;
|
| 447 |
|
|
esub = es - 1;
|
| 448 |
|
|
ssp = sp;
|
| 449 |
|
|
oldssp = ssp;
|
| 450 |
|
|
for (;;) { /* find last match of innards */
|
| 451 |
|
|
sep = slow(m, ssp, rest, ssub, esub);
|
| 452 |
|
|
if (sep == NULL || sep == ssp)
|
| 453 |
|
|
break; /* failed or matched null */
|
| 454 |
|
|
oldssp = ssp; /* on to next try */
|
| 455 |
|
|
ssp = sep;
|
| 456 |
|
|
}
|
| 457 |
|
|
if (sep == NULL) {
|
| 458 |
|
|
/* last successful match */
|
| 459 |
|
|
sep = ssp;
|
| 460 |
|
|
ssp = oldssp;
|
| 461 |
|
|
}
|
| 462 |
|
|
assert(sep == rest); /* must exhaust substring */
|
| 463 |
|
|
assert(slow(m, ssp, sep, ssub, esub) == rest);
|
| 464 |
|
|
dp = dissect(m, ssp, sep, ssub, esub);
|
| 465 |
|
|
assert(dp == sep);
|
| 466 |
|
|
sp = rest;
|
| 467 |
|
|
break;
|
| 468 |
|
|
case OCH_:
|
| 469 |
|
|
stp = stop;
|
| 470 |
|
|
for (;;) {
|
| 471 |
|
|
/* how long could this one be? */
|
| 472 |
|
|
rest = slow(m, sp, stp, ss, es);
|
| 473 |
|
|
assert(rest != NULL); /* it did match */
|
| 474 |
|
|
/* could the rest match the rest? */
|
| 475 |
|
|
tail = slow(m, rest, stop, es, stopst);
|
| 476 |
|
|
if (tail == stop)
|
| 477 |
|
|
break; /* yes! */
|
| 478 |
|
|
/* no -- try a shorter match for this one */
|
| 479 |
|
|
stp = rest - 1;
|
| 480 |
|
|
assert(stp >= sp); /* it did work */
|
| 481 |
|
|
}
|
| 482 |
|
|
ssub = ss + 1;
|
| 483 |
|
|
esub = ss + OPND(m->g->strip[ss]) - 1;
|
| 484 |
|
|
assert(OP(m->g->strip[esub]) == OOR1);
|
| 485 |
|
|
for (;;) { /* find first matching branch */
|
| 486 |
|
|
if (slow(m, sp, rest, ssub, esub) == rest)
|
| 487 |
|
|
break; /* it matched all of it */
|
| 488 |
|
|
/* that one missed, try next one */
|
| 489 |
|
|
assert(OP(m->g->strip[esub]) == OOR1);
|
| 490 |
|
|
esub++;
|
| 491 |
|
|
assert(OP(m->g->strip[esub]) == OOR2);
|
| 492 |
|
|
ssub = esub + 1;
|
| 493 |
|
|
esub += OPND(m->g->strip[esub]);
|
| 494 |
|
|
if (OP(m->g->strip[esub]) == OOR2)
|
| 495 |
|
|
esub--;
|
| 496 |
|
|
else
|
| 497 |
|
|
assert(OP(m->g->strip[esub]) == O_CH);
|
| 498 |
|
|
}
|
| 499 |
|
|
dp = dissect(m, sp, rest, ssub, esub);
|
| 500 |
|
|
assert(dp == rest);
|
| 501 |
|
|
sp = rest;
|
| 502 |
|
|
break;
|
| 503 |
|
|
case O_PLUS:
|
| 504 |
|
|
case O_QUEST:
|
| 505 |
|
|
case OOR1:
|
| 506 |
|
|
case OOR2:
|
| 507 |
|
|
case O_CH:
|
| 508 |
|
|
assert(nope);
|
| 509 |
|
|
break;
|
| 510 |
|
|
case OLPAREN:
|
| 511 |
|
|
i = OPND(m->g->strip[ss]);
|
| 512 |
|
|
assert(0 < i && i <= m->g->nsub);
|
| 513 |
|
|
m->pmatch[i].rm_so = sp - m->offp;
|
| 514 |
|
|
break;
|
| 515 |
|
|
case ORPAREN:
|
| 516 |
|
|
i = OPND(m->g->strip[ss]);
|
| 517 |
|
|
assert(0 < i && i <= m->g->nsub);
|
| 518 |
|
|
m->pmatch[i].rm_eo = sp - m->offp;
|
| 519 |
|
|
break;
|
| 520 |
|
|
default: /* uh oh */
|
| 521 |
|
|
assert(nope);
|
| 522 |
|
|
break;
|
| 523 |
|
|
}
|
| 524 |
|
|
}
|
| 525 |
|
|
|
| 526 |
|
|
assert(sp == stop);
|
| 527 |
|
|
return(sp);
|
| 528 |
|
|
}
|
| 529 |
|
|
|
| 530 |
|
|
/*
|
| 531 |
|
|
- backref - figure out what matched what, figuring in back references
|
| 532 |
|
|
== static char *backref(struct match *m, char *start, \
|
| 533 |
|
|
== char *stop, sopno startst, sopno stopst, sopno lev);
|
| 534 |
|
|
*/
|
| 535 |
|
|
static char * /* == stop (success) or NULL (failure) */
|
| 536 |
|
|
backref(m, start, stop, startst, stopst, lev)
|
| 537 |
|
|
struct match *m;
|
| 538 |
|
|
char *start;
|
| 539 |
|
|
char *stop;
|
| 540 |
|
|
sopno startst;
|
| 541 |
|
|
sopno stopst;
|
| 542 |
|
|
sopno lev; /* PLUS nesting level */
|
| 543 |
|
|
{
|
| 544 |
|
|
int i;
|
| 545 |
|
|
sopno ss; /* start sop of current subRE */
|
| 546 |
|
|
char *sp; /* start of string matched by it */
|
| 547 |
|
|
sopno ssub; /* start sop of subsubRE */
|
| 548 |
|
|
sopno esub; /* end sop of subsubRE */
|
| 549 |
|
|
char *ssp; /* start of string matched by subsubRE */
|
| 550 |
|
|
char *dp;
|
| 551 |
|
|
size_t len;
|
| 552 |
|
|
int hard;
|
| 553 |
|
|
sop s;
|
| 554 |
|
|
regoff_t offsave;
|
| 555 |
|
|
cset *cs;
|
| 556 |
|
|
|
| 557 |
|
|
AT("back", start, stop, startst, stopst);
|
| 558 |
|
|
sp = start;
|
| 559 |
|
|
|
| 560 |
|
|
/* get as far as we can with easy stuff */
|
| 561 |
|
|
hard = 0;
|
| 562 |
|
|
for (ss = startst; !hard && ss < stopst; ss++)
|
| 563 |
|
|
switch (OP(s = m->g->strip[ss])) {
|
| 564 |
|
|
case OCHAR:
|
| 565 |
|
|
if (sp == stop || *sp++ != (char)OPND(s))
|
| 566 |
|
|
return(NULL);
|
| 567 |
|
|
break;
|
| 568 |
|
|
case OANY:
|
| 569 |
|
|
if (sp == stop)
|
| 570 |
|
|
return(NULL);
|
| 571 |
|
|
sp++;
|
| 572 |
|
|
break;
|
| 573 |
|
|
case OANYOF:
|
| 574 |
|
|
cs = &m->g->sets[OPND(s)];
|
| 575 |
|
|
if (sp == stop || !CHIN(cs, *sp++))
|
| 576 |
|
|
return(NULL);
|
| 577 |
|
|
break;
|
| 578 |
|
|
case OBOL:
|
| 579 |
|
|
if ( (sp == m->beginp && !(m->eflags®_NOTBOL)) ||
|
| 580 |
|
|
(sp < m->endp && *(sp-1) == '\n' &&
|
| 581 |
|
|
(m->g->cflags®_NEWLINE)) )
|
| 582 |
|
|
{ /* yes */ }
|
| 583 |
|
|
else
|
| 584 |
|
|
return(NULL);
|
| 585 |
|
|
break;
|
| 586 |
|
|
case OEOL:
|
| 587 |
|
|
if ( (sp == m->endp && !(m->eflags®_NOTEOL)) ||
|
| 588 |
|
|
(sp < m->endp && *sp == '\n' &&
|
| 589 |
|
|
(m->g->cflags®_NEWLINE)) )
|
| 590 |
|
|
{ /* yes */ }
|
| 591 |
|
|
else
|
| 592 |
|
|
return(NULL);
|
| 593 |
|
|
break;
|
| 594 |
|
|
case OBOW:
|
| 595 |
|
|
if (( (sp == m->beginp && !(m->eflags®_NOTBOL)) ||
|
| 596 |
|
|
(sp < m->endp && *(sp-1) == '\n' &&
|
| 597 |
|
|
(m->g->cflags®_NEWLINE)) ||
|
| 598 |
|
|
(sp > m->beginp &&
|
| 599 |
|
|
!ISWORD(*(sp-1))) ) &&
|
| 600 |
|
|
(sp < m->endp && ISWORD(*sp)) )
|
| 601 |
|
|
{ /* yes */ }
|
| 602 |
|
|
else
|
| 603 |
|
|
return(NULL);
|
| 604 |
|
|
break;
|
| 605 |
|
|
case OEOW:
|
| 606 |
|
|
if (( (sp == m->endp && !(m->eflags®_NOTEOL)) ||
|
| 607 |
|
|
(sp < m->endp && *sp == '\n' &&
|
| 608 |
|
|
(m->g->cflags®_NEWLINE)) ||
|
| 609 |
|
|
(sp < m->endp && !ISWORD(*sp)) ) &&
|
| 610 |
|
|
(sp > m->beginp && ISWORD(*(sp-1))) )
|
| 611 |
|
|
{ /* yes */ }
|
| 612 |
|
|
else
|
| 613 |
|
|
return(NULL);
|
| 614 |
|
|
break;
|
| 615 |
|
|
case O_QUEST:
|
| 616 |
|
|
break;
|
| 617 |
|
|
case OOR1: /* matches null but needs to skip */
|
| 618 |
|
|
ss++;
|
| 619 |
|
|
s = m->g->strip[ss];
|
| 620 |
|
|
do {
|
| 621 |
|
|
assert(OP(s) == OOR2);
|
| 622 |
|
|
ss += OPND(s);
|
| 623 |
|
|
} while (OP(s = m->g->strip[ss]) != O_CH);
|
| 624 |
|
|
/* note that the ss++ gets us past the O_CH */
|
| 625 |
|
|
break;
|
| 626 |
|
|
default: /* have to make a choice */
|
| 627 |
|
|
hard = 1;
|
| 628 |
|
|
break;
|
| 629 |
|
|
}
|
| 630 |
|
|
if (!hard) { /* that was it! */
|
| 631 |
|
|
if (sp != stop)
|
| 632 |
|
|
return(NULL);
|
| 633 |
|
|
return(sp);
|
| 634 |
|
|
}
|
| 635 |
|
|
ss--; /* adjust for the for's final increment */
|
| 636 |
|
|
|
| 637 |
|
|
/* the hard stuff */
|
| 638 |
|
|
AT("hard", sp, stop, ss, stopst);
|
| 639 |
|
|
s = m->g->strip[ss];
|
| 640 |
|
|
switch (OP(s)) {
|
| 641 |
|
|
case OBACK_: /* the vilest depths */
|
| 642 |
|
|
i = OPND(s);
|
| 643 |
|
|
assert(0 < i && i <= m->g->nsub);
|
| 644 |
|
|
if (m->pmatch[i].rm_eo == -1)
|
| 645 |
|
|
return(NULL);
|
| 646 |
|
|
assert(m->pmatch[i].rm_so != -1);
|
| 647 |
|
|
len = m->pmatch[i].rm_eo - m->pmatch[i].rm_so;
|
| 648 |
|
|
assert(stop - m->beginp >= len);
|
| 649 |
|
|
if (sp > stop - len)
|
| 650 |
|
|
return(NULL); /* not enough left to match */
|
| 651 |
|
|
ssp = m->offp + m->pmatch[i].rm_so;
|
| 652 |
|
|
if (memcmp(sp, ssp, len) != 0)
|
| 653 |
|
|
return(NULL);
|
| 654 |
|
|
while (m->g->strip[ss] != SOP(O_BACK, i))
|
| 655 |
|
|
ss++;
|
| 656 |
|
|
return(backref(m, sp+len, stop, ss+1, stopst, lev));
|
| 657 |
|
|
break;
|
| 658 |
|
|
case OQUEST_: /* to null or not */
|
| 659 |
|
|
dp = backref(m, sp, stop, ss+1, stopst, lev);
|
| 660 |
|
|
if (dp != NULL)
|
| 661 |
|
|
return(dp); /* not */
|
| 662 |
|
|
return(backref(m, sp, stop, ss+OPND(s)+1, stopst, lev));
|
| 663 |
|
|
break;
|
| 664 |
|
|
case OPLUS_:
|
| 665 |
|
|
assert(m->lastpos != NULL);
|
| 666 |
|
|
assert(lev+1 <= m->g->nplus);
|
| 667 |
|
|
m->lastpos[lev+1] = sp;
|
| 668 |
|
|
return(backref(m, sp, stop, ss+1, stopst, lev+1));
|
| 669 |
|
|
break;
|
| 670 |
|
|
case O_PLUS:
|
| 671 |
|
|
if (sp == m->lastpos[lev]) /* last pass matched null */
|
| 672 |
|
|
return(backref(m, sp, stop, ss+1, stopst, lev-1));
|
| 673 |
|
|
/* try another pass */
|
| 674 |
|
|
m->lastpos[lev] = sp;
|
| 675 |
|
|
dp = backref(m, sp, stop, ss-OPND(s)+1, stopst, lev);
|
| 676 |
|
|
if (dp == NULL)
|
| 677 |
|
|
return(backref(m, sp, stop, ss+1, stopst, lev-1));
|
| 678 |
|
|
else
|
| 679 |
|
|
return(dp);
|
| 680 |
|
|
break;
|
| 681 |
|
|
case OCH_: /* find the right one, if any */
|
| 682 |
|
|
ssub = ss + 1;
|
| 683 |
|
|
esub = ss + OPND(s) - 1;
|
| 684 |
|
|
assert(OP(m->g->strip[esub]) == OOR1);
|
| 685 |
|
|
for (;;) { /* find first matching branch */
|
| 686 |
|
|
dp = backref(m, sp, stop, ssub, esub, lev);
|
| 687 |
|
|
if (dp != NULL)
|
| 688 |
|
|
return(dp);
|
| 689 |
|
|
/* that one missed, try next one */
|
| 690 |
|
|
if (OP(m->g->strip[esub]) == O_CH)
|
| 691 |
|
|
return(NULL); /* there is none */
|
| 692 |
|
|
esub++;
|
| 693 |
|
|
assert(OP(m->g->strip[esub]) == OOR2);
|
| 694 |
|
|
ssub = esub + 1;
|
| 695 |
|
|
esub += OPND(m->g->strip[esub]);
|
| 696 |
|
|
if (OP(m->g->strip[esub]) == OOR2)
|
| 697 |
|
|
esub--;
|
| 698 |
|
|
else
|
| 699 |
|
|
assert(OP(m->g->strip[esub]) == O_CH);
|
| 700 |
|
|
}
|
| 701 |
|
|
break;
|
| 702 |
|
|
case OLPAREN: /* must undo assignment if rest fails */
|
| 703 |
|
|
i = OPND(s);
|
| 704 |
|
|
assert(0 < i && i <= m->g->nsub);
|
| 705 |
|
|
offsave = m->pmatch[i].rm_so;
|
| 706 |
|
|
m->pmatch[i].rm_so = sp - m->offp;
|
| 707 |
|
|
dp = backref(m, sp, stop, ss+1, stopst, lev);
|
| 708 |
|
|
if (dp != NULL)
|
| 709 |
|
|
return(dp);
|
| 710 |
|
|
m->pmatch[i].rm_so = offsave;
|
| 711 |
|
|
return(NULL);
|
| 712 |
|
|
break;
|
| 713 |
|
|
case ORPAREN: /* must undo assignment if rest fails */
|
| 714 |
|
|
i = OPND(s);
|
| 715 |
|
|
assert(0 < i && i <= m->g->nsub);
|
| 716 |
|
|
offsave = m->pmatch[i].rm_eo;
|
| 717 |
|
|
m->pmatch[i].rm_eo = sp - m->offp;
|
| 718 |
|
|
dp = backref(m, sp, stop, ss+1, stopst, lev);
|
| 719 |
|
|
if (dp != NULL)
|
| 720 |
|
|
return(dp);
|
| 721 |
|
|
m->pmatch[i].rm_eo = offsave;
|
| 722 |
|
|
return(NULL);
|
| 723 |
|
|
break;
|
| 724 |
|
|
default: /* uh oh */
|
| 725 |
|
|
assert(nope);
|
| 726 |
|
|
break;
|
| 727 |
|
|
}
|
| 728 |
|
|
|
| 729 |
|
|
/* "can't happen" */
|
| 730 |
|
|
assert(nope);
|
| 731 |
|
|
/* NOTREACHED */
|
| 732 |
|
|
return "shut up gcc";
|
| 733 |
|
|
}
|
| 734 |
|
|
|
| 735 |
|
|
/*
|
| 736 |
|
|
- fast - step through the string at top speed
|
| 737 |
|
|
== static char *fast(struct match *m, char *start, \
|
| 738 |
|
|
== char *stop, sopno startst, sopno stopst);
|
| 739 |
|
|
*/
|
| 740 |
|
|
static char * /* where tentative match ended, or NULL */
|
| 741 |
|
|
fast(m, start, stop, startst, stopst)
|
| 742 |
|
|
struct match *m;
|
| 743 |
|
|
char *start;
|
| 744 |
|
|
char *stop;
|
| 745 |
|
|
sopno startst;
|
| 746 |
|
|
sopno stopst;
|
| 747 |
|
|
{
|
| 748 |
|
|
states st = m->st;
|
| 749 |
|
|
states fresh = m->fresh;
|
| 750 |
|
|
states tmp = m->tmp;
|
| 751 |
|
|
char *p = start;
|
| 752 |
|
|
int c = (start == m->beginp) ? OUT : *(start-1);
|
| 753 |
|
|
int lastc; /* previous c */
|
| 754 |
|
|
int flagch;
|
| 755 |
|
|
int i;
|
| 756 |
|
|
char *coldp; /* last p after which no match was underway */
|
| 757 |
|
|
|
| 758 |
|
|
CLEAR(st);
|
| 759 |
|
|
SET1(st, startst);
|
| 760 |
|
|
st = step(m->g, startst, stopst, st, NOTHING, st);
|
| 761 |
|
|
ASSIGN(fresh, st);
|
| 762 |
|
|
SP("start", st, *p);
|
| 763 |
|
|
coldp = NULL;
|
| 764 |
|
|
for (;;) {
|
| 765 |
|
|
/* next character */
|
| 766 |
|
|
lastc = c;
|
| 767 |
|
|
c = (p == m->endp) ? OUT : *p;
|
| 768 |
|
|
if (EQ(st, fresh))
|
| 769 |
|
|
coldp = p;
|
| 770 |
|
|
|
| 771 |
|
|
/* is there an EOL and/or BOL between lastc and c? */
|
| 772 |
|
|
flagch = '\0';
|
| 773 |
|
|
i = 0;
|
| 774 |
|
|
if ( (lastc == '\n' && m->g->cflags®_NEWLINE) ||
|
| 775 |
|
|
(lastc == OUT && !(m->eflags®_NOTBOL)) ) {
|
| 776 |
|
|
flagch = BOL;
|
| 777 |
|
|
i = m->g->nbol;
|
| 778 |
|
|
}
|
| 779 |
|
|
if ( (c == '\n' && m->g->cflags®_NEWLINE) ||
|
| 780 |
|
|
(c == OUT && !(m->eflags®_NOTEOL)) ) {
|
| 781 |
|
|
flagch = (flagch == BOL) ? BOLEOL : EOL;
|
| 782 |
|
|
i += m->g->neol;
|
| 783 |
|
|
}
|
| 784 |
|
|
if (i != 0) {
|
| 785 |
|
|
for (; i > 0; i--)
|
| 786 |
|
|
st = step(m->g, startst, stopst, st, flagch, st);
|
| 787 |
|
|
SP("boleol", st, c);
|
| 788 |
|
|
}
|
| 789 |
|
|
|
| 790 |
|
|
/* how about a word boundary? */
|
| 791 |
|
|
if ( (flagch == BOL || (lastc != OUT && !ISWORD(lastc))) &&
|
| 792 |
|
|
(c != OUT && ISWORD(c)) ) {
|
| 793 |
|
|
flagch = BOW;
|
| 794 |
|
|
}
|
| 795 |
|
|
if ( (lastc != OUT && ISWORD(lastc)) &&
|
| 796 |
|
|
(flagch == EOL || (c != OUT && !ISWORD(c))) ) {
|
| 797 |
|
|
flagch = EOW;
|
| 798 |
|
|
}
|
| 799 |
|
|
if (flagch == BOW || flagch == EOW) {
|
| 800 |
|
|
st = step(m->g, startst, stopst, st, flagch, st);
|
| 801 |
|
|
SP("boweow", st, c);
|
| 802 |
|
|
}
|
| 803 |
|
|
|
| 804 |
|
|
/* are we done? */
|
| 805 |
|
|
if (ISSET(st, stopst) || p == stop)
|
| 806 |
|
|
break; /* NOTE BREAK OUT */
|
| 807 |
|
|
|
| 808 |
|
|
/* no, we must deal with this character */
|
| 809 |
|
|
ASSIGN(tmp, st);
|
| 810 |
|
|
ASSIGN(st, fresh);
|
| 811 |
|
|
assert(c != OUT);
|
| 812 |
|
|
st = step(m->g, startst, stopst, tmp, c, st);
|
| 813 |
|
|
SP("aft", st, c);
|
| 814 |
|
|
assert(EQ(step(m->g, startst, stopst, st, NOTHING, st), st));
|
| 815 |
|
|
p++;
|
| 816 |
|
|
}
|
| 817 |
|
|
|
| 818 |
|
|
assert(coldp != NULL);
|
| 819 |
|
|
m->coldp = coldp;
|
| 820 |
|
|
if (ISSET(st, stopst))
|
| 821 |
|
|
return(p+1);
|
| 822 |
|
|
else
|
| 823 |
|
|
return(NULL);
|
| 824 |
|
|
}
|
| 825 |
|
|
|
| 826 |
|
|
/*
|
| 827 |
|
|
- slow - step through the string more deliberately
|
| 828 |
|
|
== static char *slow(struct match *m, char *start, \
|
| 829 |
|
|
== char *stop, sopno startst, sopno stopst);
|
| 830 |
|
|
*/
|
| 831 |
|
|
static char * /* where it ended */
|
| 832 |
|
|
slow(m, start, stop, startst, stopst)
|
| 833 |
|
|
struct match *m;
|
| 834 |
|
|
char *start;
|
| 835 |
|
|
char *stop;
|
| 836 |
|
|
sopno startst;
|
| 837 |
|
|
sopno stopst;
|
| 838 |
|
|
{
|
| 839 |
|
|
states st = m->st;
|
| 840 |
|
|
states empty = m->empty;
|
| 841 |
|
|
states tmp = m->tmp;
|
| 842 |
|
|
char *p = start;
|
| 843 |
|
|
int c = (start == m->beginp) ? OUT : *(start-1);
|
| 844 |
|
|
int lastc; /* previous c */
|
| 845 |
|
|
int flagch;
|
| 846 |
|
|
int i;
|
| 847 |
|
|
char *matchp; /* last p at which a match ended */
|
| 848 |
|
|
|
| 849 |
|
|
AT("slow", start, stop, startst, stopst);
|
| 850 |
|
|
CLEAR(st);
|
| 851 |
|
|
SET1(st, startst);
|
| 852 |
|
|
SP("sstart", st, *p);
|
| 853 |
|
|
st = step(m->g, startst, stopst, st, NOTHING, st);
|
| 854 |
|
|
matchp = NULL;
|
| 855 |
|
|
for (;;) {
|
| 856 |
|
|
/* next character */
|
| 857 |
|
|
lastc = c;
|
| 858 |
|
|
c = (p == m->endp) ? OUT : *p;
|
| 859 |
|
|
|
| 860 |
|
|
/* is there an EOL and/or BOL between lastc and c? */
|
| 861 |
|
|
flagch = '\0';
|
| 862 |
|
|
i = 0;
|
| 863 |
|
|
if ( (lastc == '\n' && m->g->cflags®_NEWLINE) ||
|
| 864 |
|
|
(lastc == OUT && !(m->eflags®_NOTBOL)) ) {
|
| 865 |
|
|
flagch = BOL;
|
| 866 |
|
|
i = m->g->nbol;
|
| 867 |
|
|
}
|
| 868 |
|
|
if ( (c == '\n' && m->g->cflags®_NEWLINE) ||
|
| 869 |
|
|
(c == OUT && !(m->eflags®_NOTEOL)) ) {
|
| 870 |
|
|
flagch = (flagch == BOL) ? BOLEOL : EOL;
|
| 871 |
|
|
i += m->g->neol;
|
| 872 |
|
|
}
|
| 873 |
|
|
if (i != 0) {
|
| 874 |
|
|
for (; i > 0; i--)
|
| 875 |
|
|
st = step(m->g, startst, stopst, st, flagch, st);
|
| 876 |
|
|
SP("sboleol", st, c);
|
| 877 |
|
|
}
|
| 878 |
|
|
|
| 879 |
|
|
/* how about a word boundary? */
|
| 880 |
|
|
if ( (flagch == BOL || (lastc != OUT && !ISWORD(lastc))) &&
|
| 881 |
|
|
(c != OUT && ISWORD(c)) ) {
|
| 882 |
|
|
flagch = BOW;
|
| 883 |
|
|
}
|
| 884 |
|
|
if ( (lastc != OUT && ISWORD(lastc)) &&
|
| 885 |
|
|
(flagch == EOL || (c != OUT && !ISWORD(c))) ) {
|
| 886 |
|
|
flagch = EOW;
|
| 887 |
|
|
}
|
| 888 |
|
|
if (flagch == BOW || flagch == EOW) {
|
| 889 |
|
|
st = step(m->g, startst, stopst, st, flagch, st);
|
| 890 |
|
|
SP("sboweow", st, c);
|
| 891 |
|
|
}
|
| 892 |
|
|
|
| 893 |
|
|
/* are we done? */
|
| 894 |
|
|
if (ISSET(st, stopst))
|
| 895 |
|
|
matchp = p;
|
| 896 |
|
|
if (EQ(st, empty) || p == stop)
|
| 897 |
|
|
break; /* NOTE BREAK OUT */
|
| 898 |
|
|
|
| 899 |
|
|
/* no, we must deal with this character */
|
| 900 |
|
|
ASSIGN(tmp, st);
|
| 901 |
|
|
ASSIGN(st, empty);
|
| 902 |
|
|
assert(c != OUT);
|
| 903 |
|
|
st = step(m->g, startst, stopst, tmp, c, st);
|
| 904 |
|
|
SP("saft", st, c);
|
| 905 |
|
|
assert(EQ(step(m->g, startst, stopst, st, NOTHING, st), st));
|
| 906 |
|
|
p++;
|
| 907 |
|
|
}
|
| 908 |
|
|
|
| 909 |
|
|
return(matchp);
|
| 910 |
|
|
}
|
| 911 |
|
|
|
| 912 |
|
|
|
| 913 |
|
|
/*
|
| 914 |
|
|
- step - map set of states reachable before char to set reachable after
|
| 915 |
|
|
== static states step(struct re_guts *g, sopno start, sopno stop, \
|
| 916 |
|
|
== states bef, int ch, states aft);
|
| 917 |
|
|
== #define BOL (OUT+1)
|
| 918 |
|
|
== #define EOL (BOL+1)
|
| 919 |
|
|
== #define BOLEOL (BOL+2)
|
| 920 |
|
|
== #define NOTHING (BOL+3)
|
| 921 |
|
|
== #define BOW (BOL+4)
|
| 922 |
|
|
== #define EOW (BOL+5)
|
| 923 |
|
|
== #define CODEMAX (BOL+5) // highest code used
|
| 924 |
|
|
== #define NONCHAR(c) ((c) > CHAR_MAX)
|
| 925 |
|
|
== #define NNONCHAR (CODEMAX-CHAR_MAX)
|
| 926 |
|
|
*/
|
| 927 |
|
|
static states
|
| 928 |
|
|
step(g, start, stop, bef, ch, aft)
|
| 929 |
|
|
struct re_guts *g;
|
| 930 |
|
|
sopno start; /* start state within strip */
|
| 931 |
|
|
sopno stop; /* state after stop state within strip */
|
| 932 |
|
|
states bef; /* states reachable before */
|
| 933 |
|
|
int ch; /* character or NONCHAR code */
|
| 934 |
|
|
states aft; /* states already known reachable after */
|
| 935 |
|
|
{
|
| 936 |
|
|
cset *cs;
|
| 937 |
|
|
sop s;
|
| 938 |
|
|
sopno pc;
|
| 939 |
|
|
onestate here; /* note, macros know this name */
|
| 940 |
|
|
sopno look;
|
| 941 |
|
|
int i;
|
| 942 |
|
|
|
| 943 |
|
|
for (pc = start, INIT(here, pc); pc != stop; pc++, INC(here)) {
|
| 944 |
|
|
s = g->strip[pc];
|
| 945 |
|
|
switch (OP(s)) {
|
| 946 |
|
|
case OEND:
|
| 947 |
|
|
assert(pc == stop-1);
|
| 948 |
|
|
break;
|
| 949 |
|
|
case OCHAR:
|
| 950 |
|
|
/* only characters can match */
|
| 951 |
|
|
assert(!NONCHAR(ch) || ch != (char)OPND(s));
|
| 952 |
|
|
if (ch == (char)OPND(s))
|
| 953 |
|
|
FWD(aft, bef, 1);
|
| 954 |
|
|
break;
|
| 955 |
|
|
case OBOL:
|
| 956 |
|
|
if (ch == BOL || ch == BOLEOL)
|
| 957 |
|
|
FWD(aft, bef, 1);
|
| 958 |
|
|
break;
|
| 959 |
|
|
case OEOL:
|
| 960 |
|
|
if (ch == EOL || ch == BOLEOL)
|
| 961 |
|
|
FWD(aft, bef, 1);
|
| 962 |
|
|
break;
|
| 963 |
|
|
case OBOW:
|
| 964 |
|
|
if (ch == BOW)
|
| 965 |
|
|
FWD(aft, bef, 1);
|
| 966 |
|
|
break;
|
| 967 |
|
|
case OEOW:
|
| 968 |
|
|
if (ch == EOW)
|
| 969 |
|
|
FWD(aft, bef, 1);
|
| 970 |
|
|
break;
|
| 971 |
|
|
case OANY:
|
| 972 |
|
|
if (!NONCHAR(ch))
|
| 973 |
|
|
FWD(aft, bef, 1);
|
| 974 |
|
|
break;
|
| 975 |
|
|
case OANYOF:
|
| 976 |
|
|
cs = &g->sets[OPND(s)];
|
| 977 |
|
|
if (!NONCHAR(ch) && CHIN(cs, ch))
|
| 978 |
|
|
FWD(aft, bef, 1);
|
| 979 |
|
|
break;
|
| 980 |
|
|
case OBACK_: /* ignored here */
|
| 981 |
|
|
case O_BACK:
|
| 982 |
|
|
FWD(aft, aft, 1);
|
| 983 |
|
|
break;
|
| 984 |
|
|
case OPLUS_: /* forward, this is just an empty */
|
| 985 |
|
|
FWD(aft, aft, 1);
|
| 986 |
|
|
break;
|
| 987 |
|
|
case O_PLUS: /* both forward and back */
|
| 988 |
|
|
FWD(aft, aft, 1);
|
| 989 |
|
|
i = ISSETBACK(aft, OPND(s));
|
| 990 |
|
|
BACK(aft, aft, OPND(s));
|
| 991 |
|
|
if (!i && ISSETBACK(aft, OPND(s))) {
|
| 992 |
|
|
/* oho, must reconsider loop body */
|
| 993 |
|
|
pc -= OPND(s) + 1;
|
| 994 |
|
|
INIT(here, pc);
|
| 995 |
|
|
}
|
| 996 |
|
|
break;
|
| 997 |
|
|
case OQUEST_: /* two branches, both forward */
|
| 998 |
|
|
FWD(aft, aft, 1);
|
| 999 |
|
|
FWD(aft, aft, OPND(s));
|
| 1000 |
|
|
break;
|
| 1001 |
|
|
case O_QUEST: /* just an empty */
|
| 1002 |
|
|
FWD(aft, aft, 1);
|
| 1003 |
|
|
break;
|
| 1004 |
|
|
case OLPAREN: /* not significant here */
|
| 1005 |
|
|
case ORPAREN:
|
| 1006 |
|
|
FWD(aft, aft, 1);
|
| 1007 |
|
|
break;
|
| 1008 |
|
|
case OCH_: /* mark the first two branches */
|
| 1009 |
|
|
FWD(aft, aft, 1);
|
| 1010 |
|
|
assert(OP(g->strip[pc+OPND(s)]) == OOR2);
|
| 1011 |
|
|
FWD(aft, aft, OPND(s));
|
| 1012 |
|
|
break;
|
| 1013 |
|
|
case OOR1: /* done a branch, find the O_CH */
|
| 1014 |
|
|
if (ISSTATEIN(aft, here)) {
|
| 1015 |
|
|
for (look = 1;
|
| 1016 |
|
|
OP(s = g->strip[pc+look]) != O_CH;
|
| 1017 |
|
|
look += OPND(s))
|
| 1018 |
|
|
assert(OP(s) == OOR2);
|
| 1019 |
|
|
FWD(aft, aft, look);
|
| 1020 |
|
|
}
|
| 1021 |
|
|
break;
|
| 1022 |
|
|
case OOR2: /* propagate OCH_'s marking */
|
| 1023 |
|
|
FWD(aft, aft, 1);
|
| 1024 |
|
|
if (OP(g->strip[pc+OPND(s)]) != O_CH) {
|
| 1025 |
|
|
assert(OP(g->strip[pc+OPND(s)]) == OOR2);
|
| 1026 |
|
|
FWD(aft, aft, OPND(s));
|
| 1027 |
|
|
}
|
| 1028 |
|
|
break;
|
| 1029 |
|
|
case O_CH: /* just empty */
|
| 1030 |
|
|
FWD(aft, aft, 1);
|
| 1031 |
|
|
break;
|
| 1032 |
|
|
default: /* ooooops... */
|
| 1033 |
|
|
assert(nope);
|
| 1034 |
|
|
break;
|
| 1035 |
|
|
}
|
| 1036 |
|
|
}
|
| 1037 |
|
|
|
| 1038 |
|
|
return(aft);
|
| 1039 |
|
|
}
|
| 1040 |
|
|
|
| 1041 |
|
|
#ifdef REDEBUG
|
| 1042 |
|
|
/*
|
| 1043 |
|
|
- print - print a set of states
|
| 1044 |
|
|
== #ifdef REDEBUG
|
| 1045 |
|
|
== static void print(struct match *m, char *caption, states st, \
|
| 1046 |
|
|
== int ch, FILE *d);
|
| 1047 |
|
|
== #endif
|
| 1048 |
|
|
*/
|
| 1049 |
|
|
static void
|
| 1050 |
|
|
print(m, caption, st, ch, d)
|
| 1051 |
|
|
struct match *m;
|
| 1052 |
|
|
char *caption;
|
| 1053 |
|
|
states st;
|
| 1054 |
|
|
int ch;
|
| 1055 |
|
|
FILE *d;
|
| 1056 |
|
|
{
|
| 1057 |
|
|
struct re_guts *g = m->g;
|
| 1058 |
|
|
int i;
|
| 1059 |
|
|
int first = 1;
|
| 1060 |
|
|
|
| 1061 |
|
|
if (!(m->eflags®_TRACE))
|
| 1062 |
|
|
return;
|
| 1063 |
|
|
|
| 1064 |
|
|
fprintf(d, "%s", caption);
|
| 1065 |
|
|
if (ch != '\0')
|
| 1066 |
|
|
fprintf(d, " %s", pchar(ch));
|
| 1067 |
|
|
for (i = 0; i < g->nstates; i++)
|
| 1068 |
|
|
if (ISSET(st, i)) {
|
| 1069 |
|
|
fprintf(d, "%s%d", (first) ? "\t" : ", ", i);
|
| 1070 |
|
|
first = 0;
|
| 1071 |
|
|
}
|
| 1072 |
|
|
fprintf(d, "\n");
|
| 1073 |
|
|
}
|
| 1074 |
|
|
|
| 1075 |
|
|
/*
|
| 1076 |
|
|
- at - print current situation
|
| 1077 |
|
|
== #ifdef REDEBUG
|
| 1078 |
|
|
== static void at(struct match *m, char *title, char *start, char *stop, \
|
| 1079 |
|
|
== sopno startst, sopno stopst);
|
| 1080 |
|
|
== #endif
|
| 1081 |
|
|
*/
|
| 1082 |
|
|
static void
|
| 1083 |
|
|
at(m, title, start, stop, startst, stopst)
|
| 1084 |
|
|
struct match *m;
|
| 1085 |
|
|
char *title;
|
| 1086 |
|
|
char *start;
|
| 1087 |
|
|
char *stop;
|
| 1088 |
|
|
sopno startst;
|
| 1089 |
|
|
sopno stopst;
|
| 1090 |
|
|
{
|
| 1091 |
|
|
if (!(m->eflags®_TRACE))
|
| 1092 |
|
|
return;
|
| 1093 |
|
|
|
| 1094 |
|
|
printf("%s %s-", title, pchar(*start));
|
| 1095 |
|
|
printf("%s ", pchar(*stop));
|
| 1096 |
|
|
printf("%ld-%ld\n", (long)startst, (long)stopst);
|
| 1097 |
|
|
}
|
| 1098 |
|
|
|
| 1099 |
|
|
#ifndef PCHARDONE
|
| 1100 |
|
|
#define PCHARDONE /* never again */
|
| 1101 |
|
|
/*
|
| 1102 |
|
|
- pchar - make a character printable
|
| 1103 |
|
|
== #ifdef REDEBUG
|
| 1104 |
|
|
== static char *pchar(int ch);
|
| 1105 |
|
|
== #endif
|
| 1106 |
|
|
*
|
| 1107 |
|
|
* Is this identical to regchar() over in debug.c? Well, yes. But a
|
| 1108 |
|
|
* duplicate here avoids having a debugging-capable regexec.o tied to
|
| 1109 |
|
|
* a matching debug.o, and this is convenient. It all disappears in
|
| 1110 |
|
|
* the non-debug compilation anyway, so it doesn't matter much.
|
| 1111 |
|
|
*/
|
| 1112 |
|
|
static char * /* -> representation */
|
| 1113 |
|
|
pchar(ch)
|
| 1114 |
|
|
int ch;
|
| 1115 |
|
|
{
|
| 1116 |
|
|
static char pbuf[10];
|
| 1117 |
|
|
|
| 1118 |
|
|
if (isprint((uch)ch) || ch == ' ')
|
| 1119 |
|
|
sprintf(pbuf, "%c", ch);
|
| 1120 |
|
|
else
|
| 1121 |
|
|
sprintf(pbuf, "\\%o", ch);
|
| 1122 |
|
|
return(pbuf);
|
| 1123 |
|
|
}
|
| 1124 |
|
|
#endif
|
| 1125 |
|
|
#endif
|
| 1126 |
|
|
|
| 1127 |
|
|
#undef matcher
|
| 1128 |
|
|
#undef fast
|
| 1129 |
|
|
#undef slow
|
| 1130 |
|
|
#undef dissect
|
| 1131 |
|
|
#undef backref
|
| 1132 |
|
|
#undef step
|
| 1133 |
|
|
#undef print
|
| 1134 |
|
|
#undef at
|
| 1135 |
|
|
#undef match
|
