diff options
Diffstat (limited to 'generic')
| -rw-r--r-- | generic/rege_dfa.c | 1221 | ||||
| -rw-r--r-- | generic/regerror.c | 148 | ||||
| -rw-r--r-- | generic/regexec.c | 1781 | ||||
| -rw-r--r-- | generic/regfree.c | 47 | ||||
| -rw-r--r-- | generic/regfronts.c | 92 |
5 files changed, 1817 insertions, 1472 deletions
diff --git a/generic/rege_dfa.c b/generic/rege_dfa.c index 313892c..a6b3848 100644 --- a/generic/rege_dfa.c +++ b/generic/rege_dfa.c @@ -3,20 +3,20 @@ * This file is #included by regexec.c. * * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. - * + * * Development of this software was funded, in part, by Cray Research Inc., * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics * Corporation, none of whom are responsible for the results. The author - * thanks all of them. - * + * thanks all of them. + * * Redistribution and use in source and binary forms -- with or without * modification -- are permitted for any purpose, provided that * redistributions in source form retain this entire copyright notice and * indicate the origin and nature of any modifications. - * + * * I'd appreciate being given credit for this package in the documentation * of software which uses it, but that is not a requirement. - * + * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL @@ -29,521 +29,620 @@ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ - + /* - longest - longest-preferred matching engine ^ static chr *longest(struct vars *, struct dfa *, chr *, chr *, int *); */ static chr * /* endpoint, or NULL */ -longest(v, d, start, stop, hitstopp) -struct vars *v; /* used only for debug and exec flags */ -struct dfa *d; -chr *start; /* where the match should start */ -chr *stop; /* match must end at or before here */ -int *hitstopp; /* record whether hit v->stop, if non-NULL */ +longest( + struct vars *v, /* used only for debug and exec flags */ + struct dfa *d, + chr *start, /* where the match should start */ + chr *stop, /* match must end at or before here */ + int *hitstopp) /* record whether hit v->stop, if non-NULL */ { - chr *cp; - chr *realstop = (stop == v->stop) ? stop : stop + 1; - color co; - struct sset *css; - struct sset *ss; - chr *post; - int i; - struct colormap *cm = d->cm; - - /* initialize */ - css = initialize(v, d, start); - cp = start; - if (hitstopp != NULL) - *hitstopp = 0; - - /* startup */ - FDEBUG(("+++ startup +++\n")); - if (cp == v->start) { - co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; - FDEBUG(("color %ld\n", (long)co)); - } else { - co = GETCOLOR(cm, *(cp - 1)); - FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); - } - css = miss(v, d, css, co, cp, start); - if (css == NULL) - return NULL; - css->lastseen = cp; - - /* main loop */ - if (v->eflags®_FTRACE) - while (cp < realstop) { - FDEBUG(("+++ at c%d +++\n", css - d->ssets)); - co = GETCOLOR(cm, *cp); - FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); - ss = css->outs[co]; - if (ss == NULL) { - ss = miss(v, d, css, co, cp+1, start); - if (ss == NULL) - break; /* NOTE BREAK OUT */ - } - cp++; - ss->lastseen = cp; - css = ss; + chr *cp; + chr *realstop = (stop == v->stop) ? stop : stop + 1; + color co; + struct sset *css; + struct sset *ss; + chr *post; + int i; + struct colormap *cm = d->cm; + + /* + * Initialize. + */ + + css = initialize(v, d, start); + cp = start; + if (hitstopp != NULL) { + *hitstopp = 0; + } + + /* + * Startup. + */ + + FDEBUG(("+++ startup +++\n")); + if (cp == v->start) { + co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; + FDEBUG(("color %ld\n", (long)co)); + } else { + co = GETCOLOR(cm, *(cp - 1)); + FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); + } + css = miss(v, d, css, co, cp, start); + if (css == NULL) { + return NULL; + } + css->lastseen = cp; + + /* + * Main loop. + */ + + if (v->eflags®_FTRACE) { + while (cp < realstop) { + FDEBUG(("+++ at c%d +++\n", css - d->ssets)); + co = GETCOLOR(cm, *cp); + FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); + ss = css->outs[co]; + if (ss == NULL) { + ss = miss(v, d, css, co, cp+1, start); + if (ss == NULL) { + break; /* NOTE BREAK OUT */ } - else - while (cp < realstop) { - co = GETCOLOR(cm, *cp); - ss = css->outs[co]; - if (ss == NULL) { - ss = miss(v, d, css, co, cp+1, start); - if (ss == NULL) - break; /* NOTE BREAK OUT */ - } - cp++; - ss->lastseen = cp; - css = ss; + } + cp++; + ss->lastseen = cp; + css = ss; + } + } else { + while (cp < realstop) { + co = GETCOLOR(cm, *cp); + ss = css->outs[co]; + if (ss == NULL) { + ss = miss(v, d, css, co, cp+1, start); + if (ss == NULL) { + break; /* NOTE BREAK OUT */ } + } + cp++; + ss->lastseen = cp; + css = ss; + } + } - /* shutdown */ - FDEBUG(("+++ shutdown at c%d +++\n", css - d->ssets)); - if (cp == v->stop && stop == v->stop) { - if (hitstopp != NULL) - *hitstopp = 1; - co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; - FDEBUG(("color %ld\n", (long)co)); - ss = miss(v, d, css, co, cp, start); - /* special case: match ended at eol? */ - if (ss != NULL && (ss->flags&POSTSTATE)) - return cp; - else if (ss != NULL) - ss->lastseen = cp; /* to be tidy */ + /* + * Shutdown. + */ + + FDEBUG(("+++ shutdown at c%d +++\n", css - d->ssets)); + if (cp == v->stop && stop == v->stop) { + if (hitstopp != NULL) { + *hitstopp = 1; + } + co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; + FDEBUG(("color %ld\n", (long)co)); + ss = miss(v, d, css, co, cp, start); + + /* + * Special case: match ended at eol? + */ + + if (ss != NULL && (ss->flags&POSTSTATE)) { + return cp; + } else if (ss != NULL) { + ss->lastseen = cp; /* to be tidy */ } + } - /* find last match, if any */ - post = d->lastpost; - for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) - if ((ss->flags&POSTSTATE) && post != ss->lastseen && - (post == NULL || post < ss->lastseen)) - post = ss->lastseen; - if (post != NULL) /* found one */ - return post - 1; + /* + * Find last match, if any. + */ - return NULL; -} + post = d->lastpost; + for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) { + if ((ss->flags&POSTSTATE) && (post != ss->lastseen) && + (post == NULL || post < ss->lastseen)) { + post = ss->lastseen; + } + } + if (post != NULL) { /* found one */ + return post - 1; + } + return NULL; +} + /* - shortest - shortest-preferred matching engine ^ static chr *shortest(struct vars *, struct dfa *, chr *, chr *, chr *, ^ chr **, int *); */ static chr * /* endpoint, or NULL */ -shortest(v, d, start, min, max, coldp, hitstopp) -struct vars *v; -struct dfa *d; -chr *start; /* where the match should start */ -chr *min; /* match must end at or after here */ -chr *max; /* match must end at or before here */ -chr **coldp; /* store coldstart pointer here, if nonNULL */ -int *hitstopp; /* record whether hit v->stop, if non-NULL */ +shortest( + struct vars *v, + struct dfa *d, + chr *start, /* where the match should start */ + chr *min, /* match must end at or after here */ + chr *max, /* match must end at or before here */ + chr **coldp, /* store coldstart pointer here, if nonNULL */ + int *hitstopp) /* record whether hit v->stop, if non-NULL */ { - chr *cp; - chr *realmin = (min == v->stop) ? min : min + 1; - chr *realmax = (max == v->stop) ? max : max + 1; - color co; - struct sset *css; - struct sset *ss; - struct colormap *cm = d->cm; - - /* initialize */ - css = initialize(v, d, start); - cp = start; - if (hitstopp != NULL) - *hitstopp = 0; - - /* startup */ - FDEBUG(("--- startup ---\n")); - if (cp == v->start) { - co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; - FDEBUG(("color %ld\n", (long)co)); - } else { - co = GETCOLOR(cm, *(cp - 1)); - FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); - } - css = miss(v, d, css, co, cp, start); - if (css == NULL) - return NULL; - css->lastseen = cp; - ss = css; - - /* main loop */ - if (v->eflags®_FTRACE) - while (cp < realmax) { - FDEBUG(("--- at c%d ---\n", css - d->ssets)); - co = GETCOLOR(cm, *cp); - FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); - ss = css->outs[co]; - if (ss == NULL) { - ss = miss(v, d, css, co, cp+1, start); - if (ss == NULL) - break; /* NOTE BREAK OUT */ - } - cp++; - ss->lastseen = cp; - css = ss; - if ((ss->flags&POSTSTATE) && cp >= realmin) - break; /* NOTE BREAK OUT */ + chr *cp; + chr *realmin = (min == v->stop) ? min : min + 1; + chr *realmax = (max == v->stop) ? max : max + 1; + color co; + struct sset *css; + struct sset *ss; + struct colormap *cm = d->cm; + + /* + * Initialize. + */ + + css = initialize(v, d, start); + cp = start; + if (hitstopp != NULL) { + *hitstopp = 0; + } + + /* + * Startup. + */ + + FDEBUG(("--- startup ---\n")); + if (cp == v->start) { + co = d->cnfa->bos[(v->eflags®_NOTBOL) ? 0 : 1]; + FDEBUG(("color %ld\n", (long)co)); + } else { + co = GETCOLOR(cm, *(cp - 1)); + FDEBUG(("char %c, color %ld\n", (char)*(cp-1), (long)co)); + } + css = miss(v, d, css, co, cp, start); + if (css == NULL) { + return NULL; + } + css->lastseen = cp; + ss = css; + + /* + * Main loop. + */ + + if (v->eflags®_FTRACE) { + while (cp < realmax) { + FDEBUG(("--- at c%d ---\n", css - d->ssets)); + co = GETCOLOR(cm, *cp); + FDEBUG(("char %c, color %ld\n", (char)*cp, (long)co)); + ss = css->outs[co]; + if (ss == NULL) { + ss = miss(v, d, css, co, cp+1, start); + if (ss == NULL) { + break; /* NOTE BREAK OUT */ } - else - while (cp < realmax) { - co = GETCOLOR(cm, *cp); - ss = css->outs[co]; - if (ss == NULL) { - ss = miss(v, d, css, co, cp+1, start); - if (ss == NULL) - break; /* NOTE BREAK OUT */ - } - cp++; - ss->lastseen = cp; - css = ss; - if ((ss->flags&POSTSTATE) && cp >= realmin) - break; /* NOTE BREAK OUT */ + } + cp++; + ss->lastseen = cp; + css = ss; + if ((ss->flags&POSTSTATE) && cp >= realmin) { + break; /* NOTE BREAK OUT */ + } + } + } else { + while (cp < realmax) { + co = GETCOLOR(cm, *cp); + ss = css->outs[co]; + if (ss == NULL) { + ss = miss(v, d, css, co, cp+1, start); + if (ss == NULL) { + break; /* NOTE BREAK OUT */ } + } + cp++; + ss->lastseen = cp; + css = ss; + if ((ss->flags&POSTSTATE) && cp >= realmin) { + break; /* NOTE BREAK OUT */ + } + } + } - if (ss == NULL) - return NULL; - - if (coldp != NULL) /* report last no-progress state set, if any */ - *coldp = lastcold(v, d); - - if ((ss->flags&POSTSTATE) && cp > min) { - assert(cp >= realmin); - cp--; - } else if (cp == v->stop && max == v->stop) { - co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; - FDEBUG(("color %ld\n", (long)co)); - ss = miss(v, d, css, co, cp, start); - /* match might have ended at eol */ - if ((ss == NULL || !(ss->flags&POSTSTATE)) && hitstopp != NULL) - *hitstopp = 1; + if (ss == NULL) { + return NULL; + } + + if (coldp != NULL) { /* report last no-progress state set, if any */ + *coldp = lastcold(v, d); + } + + if ((ss->flags&POSTSTATE) && cp > min) { + assert(cp >= realmin); + cp--; + } else if (cp == v->stop && max == v->stop) { + co = d->cnfa->eos[(v->eflags®_NOTEOL) ? 0 : 1]; + FDEBUG(("color %ld\n", (long)co)); + ss = miss(v, d, css, co, cp, start); + + /* + * Match might have ended at eol. + */ + + if ((ss == NULL || !(ss->flags&POSTSTATE)) && hitstopp != NULL) { + *hitstopp = 1; } + } - if (ss == NULL || !(ss->flags&POSTSTATE)) - return NULL; + if (ss == NULL || !(ss->flags&POSTSTATE)) { + return NULL; + } - return cp; + return cp; } - + /* - lastcold - determine last point at which no progress had been made ^ static chr *lastcold(struct vars *, struct dfa *); */ static chr * /* endpoint, or NULL */ -lastcold(v, d) -struct vars *v; -struct dfa *d; +lastcold( + struct vars *v, + struct dfa *d) { - struct sset *ss; - chr *nopr; - int i; - - nopr = d->lastnopr; - if (nopr == NULL) - nopr = v->start; - for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) - if ((ss->flags&NOPROGRESS) && nopr < ss->lastseen) - nopr = ss->lastseen; - return nopr; + struct sset *ss; + chr *nopr; + int i; + + nopr = d->lastnopr; + if (nopr == NULL) { + nopr = v->start; + } + for (ss = d->ssets, i = d->nssused; i > 0; ss++, i--) { + if ((ss->flags&NOPROGRESS) && nopr < ss->lastseen) { + nopr = ss->lastseen; + } + } + return nopr; } - + /* - newdfa - set up a fresh DFA ^ static struct dfa *newdfa(struct vars *, struct cnfa *, ^ struct colormap *, struct smalldfa *); */ static struct dfa * -newdfa(v, cnfa, cm, small) -struct vars *v; -struct cnfa *cnfa; -struct colormap *cm; -struct smalldfa *small; /* preallocated space, may be NULL */ +newdfa( + struct vars *v, + struct cnfa *cnfa, + struct colormap *cm, + struct smalldfa *small) /* preallocated space, may be NULL */ { - struct dfa *d; - size_t nss = cnfa->nstates * 2; - int wordsper = (cnfa->nstates + UBITS - 1) / UBITS; - struct smalldfa *smallwas = small; - - assert(cnfa != NULL && cnfa->nstates != 0); - - if (nss <= FEWSTATES && cnfa->ncolors <= FEWCOLORS) { - assert(wordsper == 1); - if (small == NULL) { - small = (struct smalldfa *)MALLOC( - sizeof(struct smalldfa)); - if (small == NULL) { - ERR(REG_ESPACE); - return NULL; - } - } - d = &small->dfa; - d->ssets = small->ssets; - d->statesarea = small->statesarea; - d->work = &d->statesarea[nss]; - d->outsarea = small->outsarea; - d->incarea = small->incarea; - d->cptsmalloced = 0; - d->mallocarea = (smallwas == NULL) ? (char *)small : NULL; - } else { - d = (struct dfa *)MALLOC(sizeof(struct dfa)); - if (d == NULL) { - ERR(REG_ESPACE); - return NULL; - } - d->ssets = (struct sset *)MALLOC(nss * sizeof(struct sset)); - d->statesarea = (unsigned *)MALLOC((nss+WORK) * wordsper * - sizeof(unsigned)); - d->work = &d->statesarea[nss * wordsper]; - d->outsarea = (struct sset **)MALLOC(nss * cnfa->ncolors * - sizeof(struct sset *)); - d->incarea = (struct arcp *)MALLOC(nss * cnfa->ncolors * - sizeof(struct arcp)); - d->cptsmalloced = 1; - d->mallocarea = (char *)d; - if (d->ssets == NULL || d->statesarea == NULL || - d->outsarea == NULL || d->incarea == NULL) { - freedfa(d); - ERR(REG_ESPACE); - return NULL; - } + struct dfa *d; + size_t nss = cnfa->nstates * 2; + int wordsper = (cnfa->nstates + UBITS - 1) / UBITS; + struct smalldfa *smallwas = small; + + assert(cnfa != NULL && cnfa->nstates != 0); + + if (nss <= FEWSTATES && cnfa->ncolors <= FEWCOLORS) { + assert(wordsper == 1); + if (small == NULL) { + small = (struct smalldfa *) MALLOC(sizeof(struct smalldfa)); + if (small == NULL) { + ERR(REG_ESPACE); + return NULL; + } } - - d->nssets = (v->eflags®_SMALL) ? 7 : nss; - d->nssused = 0; - d->nstates = cnfa->nstates; - d->ncolors = cnfa->ncolors; - d->wordsper = wordsper; - d->cnfa = cnfa; - d->cm = cm; - d->lastpost = NULL; - d->lastnopr = NULL; - d->search = d->ssets; - - /* initialization of sset fields is done as needed */ - - return d; + d = &small->dfa; + d->ssets = small->ssets; + d->statesarea = small->statesarea; + d->work = &d->statesarea[nss]; + d->outsarea = small->outsarea; + d->incarea = small->incarea; + d->cptsmalloced = 0; + d->mallocarea = (smallwas == NULL) ? (char *)small : NULL; + } else { + d = (struct dfa *)MALLOC(sizeof(struct dfa)); + if (d == NULL) { + ERR(REG_ESPACE); + return NULL; + } + d->ssets = (struct sset *)MALLOC(nss * sizeof(struct sset)); + d->statesarea = (unsigned *) + MALLOC((nss+WORK) * wordsper * sizeof(unsigned)); + d->work = &d->statesarea[nss * wordsper]; + d->outsarea = (struct sset **) + MALLOC(nss * cnfa->ncolors * sizeof(struct sset *)); + d->incarea = (struct arcp *) + MALLOC(nss * cnfa->ncolors * sizeof(struct arcp)); + d->cptsmalloced = 1; + d->mallocarea = (char *)d; + if (d->ssets == NULL || d->statesarea == NULL || + d->outsarea == NULL || d->incarea == NULL) { + freedfa(d); + ERR(REG_ESPACE); + return NULL; + } + } + + d->nssets = (v->eflags®_SMALL) ? 7 : nss; + d->nssused = 0; + d->nstates = cnfa->nstates; + d->ncolors = cnfa->ncolors; + d->wordsper = wordsper; + d->cnfa = cnfa; + d->cm = cm; + d->lastpost = NULL; + d->lastnopr = NULL; + d->search = d->ssets; + + /* + * Initialization of sset fields is done as needed. + */ + + return d; } - + /* - freedfa - free a DFA ^ static VOID freedfa(struct dfa *); */ -static VOID -freedfa(d) -struct dfa *d; +static void +freedfa( + struct dfa *d) { - if (d->cptsmalloced) { - if (d->ssets != NULL) - FREE(d->ssets); - if (d->statesarea != NULL) - FREE(d->statesarea); - if (d->outsarea != NULL) - FREE(d->outsarea); - if (d->incarea != NULL) - FREE(d->incarea); + if (d->cptsmalloced) { + if (d->ssets != NULL) { + FREE(d->ssets); + } + if (d->statesarea != NULL) { + FREE(d->statesarea); + } + if (d->outsarea != NULL) { + FREE(d->outsarea); } + if (d->incarea != NULL) { + FREE(d->incarea); + } + } - if (d->mallocarea != NULL) - FREE(d->mallocarea); + if (d->mallocarea != NULL) { + FREE(d->mallocarea); + } } - + /* - hash - construct a hash code for a bitvector * There are probably better ways, but they're more expensive. ^ static unsigned hash(unsigned *, int); */ static unsigned -hash(uv, n) -unsigned *uv; -int n; +hash( + unsigned *uv, + int n) { - int i; - unsigned h; - - h = 0; - for (i = 0; i < n; i++) - h ^= uv[i]; - return h; + int i; + unsigned h; + + h = 0; + for (i = 0; i < n; i++) { + h ^= uv[i]; + } + return h; } - + /* - initialize - hand-craft a cache entry for startup, otherwise get ready ^ static struct sset *initialize(struct vars *, struct dfa *, chr *); */ static struct sset * -initialize(v, d, start) -struct vars *v; /* used only for debug flags */ -struct dfa *d; -chr *start; +initialize( + struct vars *v, /* used only for debug flags */ + struct dfa *d, + chr *start) { - struct sset *ss; - int i; - - /* is previous one still there? */ - if (d->nssused > 0 && (d->ssets[0].flags&STARTER)) - ss = &d->ssets[0]; - else { /* no, must (re)build it */ - ss = getvacant(v, d, start, start); - for (i = 0; i < d->wordsper; i++) - ss->states[i] = 0; - BSET(ss->states, d->cnfa->pre); - ss->hash = HASH(ss->states, d->wordsper); - assert(d->cnfa->pre != d->cnfa->post); - ss->flags = STARTER|LOCKED|NOPROGRESS; - /* lastseen dealt with below */ + struct sset *ss; + int i; + + /* + * Is previous one still there? + */ + + if (d->nssused > 0 && (d->ssets[0].flags&STARTER)) { + ss = &d->ssets[0]; + } else { /* no, must (re)build it */ + ss = getvacant(v, d, start, start); + for (i = 0; i < d->wordsper; i++) { + ss->states[i] = 0; } - - for (i = 0; i < d->nssused; i++) - d->ssets[i].lastseen = NULL; - ss->lastseen = start; /* maybe untrue, but harmless */ - d->lastpost = NULL; - d->lastnopr = NULL; - return ss; + BSET(ss->states, d->cnfa->pre); + ss->hash = HASH(ss->states, d->wordsper); + assert(d->cnfa->pre != d->cnfa->post); + ss->flags = STARTER|LOCKED|NOPROGRESS; + + /* + * lastseen dealt with below + */ + } + + for (i = 0; i < d->nssused; i++) { + d->ssets[i].lastseen = NULL; + } + ss->lastseen = start; /* maybe untrue, but harmless */ + d->lastpost = NULL; + d->lastnopr = NULL; + return ss; } - + /* - miss - handle a cache miss ^ static struct sset *miss(struct vars *, struct dfa *, struct sset *, ^ pcolor, chr *, chr *); */ static struct sset * /* NULL if goes to empty set */ -miss(v, d, css, co, cp, start) -struct vars *v; /* used only for debug flags */ -struct dfa *d; -struct sset *css; -pcolor co; -chr *cp; /* next chr */ -chr *start; /* where the attempt got started */ +miss( + struct vars *v, /* used only for debug flags */ + struct dfa *d, + struct sset *css, + pcolor co, + chr *cp, /* next chr */ + chr *start) /* where the attempt got started */ { - struct cnfa *cnfa = d->cnfa; - int i; - unsigned h; - struct carc *ca; - struct sset *p; - int ispost; - int noprogress; - int gotstate; - int dolacons; - int sawlacons; - - /* for convenience, we can be called even if it might not be a miss */ - if (css->outs[co] != NULL) { - FDEBUG(("hit\n")); - return css->outs[co]; - } - FDEBUG(("miss\n")); - - /* first, what set of states would we end up in? */ - for (i = 0; i < d->wordsper; i++) - d->work[i] = 0; - ispost = 0; - noprogress = 1; - gotstate = 0; - for (i = 0; i < d->nstates; i++) - if (ISBSET(css->states, i)) - for (ca = cnfa->states[i]+1; ca->co != COLORLESS; ca++) - if (ca->co == co) { - BSET(d->work, ca->to); - gotstate = 1; - if (ca->to == cnfa->post) - ispost = 1; - if (!cnfa->states[ca->to]->co) - noprogress = 0; - FDEBUG(("%d -> %d\n", i, ca->to)); - } - dolacons = (gotstate) ? (cnfa->flags&HASLACONS) : 0; - sawlacons = 0; - while (dolacons) { /* transitive closure */ - dolacons = 0; - for (i = 0; i < d->nstates; i++) - if (ISBSET(d->work, i)) - for (ca = cnfa->states[i]+1; ca->co != COLORLESS; - ca++) { - if (ca->co <= cnfa->ncolors) - continue; /* NOTE CONTINUE */ - sawlacons = 1; - if (ISBSET(d->work, ca->to)) - continue; /* NOTE CONTINUE */ - if (!lacon(v, cnfa, cp, ca->co)) - continue; /* NOTE CONTINUE */ - BSET(d->work, ca->to); - dolacons = 1; - if (ca->to == cnfa->post) - ispost = 1; - if (!cnfa->states[ca->to]->co) - noprogress = 0; - FDEBUG(("%d :> %d\n", i, ca->to)); - } + struct cnfa *cnfa = d->cnfa; + int i; + unsigned h; + struct carc *ca; + struct sset *p; + int ispost; + int noprogress; + int gotstate; + int dolacons; + int sawlacons; + + /* + * For convenience, we can be called even if it might not be a miss. + */ + + if (css->outs[co] != NULL) { + FDEBUG(("hit\n")); + return css->outs[co]; + } + FDEBUG(("miss\n")); + + /* + * First, what set of states would we end up in? + */ + + for (i = 0; i < d->wordsper; i++) { + d->work[i] = 0; + } + ispost = 0; + noprogress = 1; + gotstate = 0; + for (i = 0; i < d->nstates; i++) { + if (ISBSET(css->states, i)) { + for (ca = cnfa->states[i]+1; ca->co != COLORLESS; ca++) { + if (ca->co == co) { + BSET(d->work, ca->to); + gotstate = 1; + if (ca->to == cnfa->post) { + ispost = 1; + } + if (!cnfa->states[ca->to]->co) { + noprogress = 0; + } + FDEBUG(("%d -> %d\n", i, ca->to)); + } + } } - if (!gotstate) - return NULL; - h = HASH(d->work, d->wordsper); - - /* next, is that in the cache? */ - for (p = d->ssets, i = d->nssused; i > 0; p++, i--) - if (HIT(h, d->work, p, d->wordsper)) { - FDEBUG(("cached c%d\n", p - d->ssets)); - break; /* NOTE BREAK OUT */ + } + dolacons = (gotstate) ? (cnfa->flags&HASLACONS) : 0; + sawlacons = 0; + while (dolacons) { /* transitive closure */ + dolacons = 0; + for (i = 0; i < d->nstates; i++) { + if (ISBSET(d->work, i)) { + for (ca = cnfa->states[i]+1; ca->co != COLORLESS; ca++) { + if (ca->co <= cnfa->ncolors) { + continue; /* NOTE CONTINUE */ + } + sawlacons = 1; + if (ISBSET(d->work, ca->to)) { + continue; /* NOTE CONTINUE */ + } + if (!lacon(v, cnfa, cp, ca->co)) { + continue; /* NOTE CONTINUE */ + } + BSET(d->work, ca->to); + dolacons = 1; + if (ca->to == cnfa->post) { + ispost = 1; + } + if (!cnfa->states[ca->to]->co) { + noprogress = 0; + } + FDEBUG(("%d :> %d\n", i, ca->to)); } - if (i == 0) { /* nope, need a new cache entry */ - p = getvacant(v, d, cp, start); - assert(p != css); - for (i = 0; i < d->wordsper; i++) - p->states[i] = d->work[i]; - p->hash = h; - p->flags = (ispost) ? POSTSTATE : 0; - if (noprogress) - p->flags |= NOPROGRESS; - /* lastseen to be dealt with by caller */ + } } - - if (!sawlacons) { /* lookahead conds. always cache miss */ - FDEBUG(("c%d[%d]->c%d\n", css - d->ssets, co, p - d->ssets)); - css->outs[co] = p; - css->inchain[co] = p->ins; - p->ins.ss = css; - p->ins.co = (color)co; + } + if (!gotstate) { + return NULL; + } + h = HASH(d->work, d->wordsper); + + /* + * Next, is that in the cache? + */ + + for (p = d->ssets, i = d->nssused; i > 0; p++, i--) { + if (HIT(h, d->work, p, d->wordsper)) { + FDEBUG(("cached c%d\n", p - d->ssets)); + break; /* NOTE BREAK OUT */ + } + } + if (i == 0) { /* nope, need a new cache entry */ + p = getvacant(v, d, cp, start); + assert(p != css); + for (i = 0; i < d->wordsper; i++) { + p->states[i] = d->work[i]; + } + p->hash = h; + p->flags = (ispost) ? POSTSTATE : 0; + if (noprogress) { + p->flags |= NOPROGRESS; } - return p; -} + /* + * lastseen to be dealt with by caller + */ + } + + if (!sawlacons) { /* lookahead conds. always cache miss */ + FDEBUG(("c%d[%d]->c%d\n", css - d->ssets, co, p - d->ssets)); + css->outs[co] = p; + css->inchain[co] = p->ins; + p->ins.ss = css; + p->ins.co = (color)co; + } + return p; +} + /* - lacon - lookahead-constraint checker for miss() ^ static int lacon(struct vars *, struct cnfa *, chr *, pcolor); */ static int /* predicate: constraint satisfied? */ -lacon(v, pcnfa, cp, co) -struct vars *v; -struct cnfa *pcnfa; /* parent cnfa */ -chr *cp; -pcolor co; /* "color" of the lookahead constraint */ +lacon( + struct vars *v, + struct cnfa *pcnfa, /* parent cnfa */ + chr *cp, + pcolor co) /* "color" of the lookahead constraint */ { - int n; - struct subre *sub; - struct dfa *d; - struct smalldfa sd; - chr *end; - - n = co - pcnfa->ncolors; - assert(n < v->g->nlacons && v->g->lacons != NULL); - FDEBUG(("=== testing lacon %d\n", n)); - sub = &v->g->lacons[n]; - d = newdfa(v, &sub->cnfa, &v->g->cmap, &sd); - if (d == NULL) { - ERR(REG_ESPACE); - return 0; - } - end = longest(v, d, cp, v->stop, (int *)NULL); - freedfa(d); - FDEBUG(("=== lacon %d match %d\n", n, (end != NULL))); - return (sub->subno) ? (end != NULL) : (end == NULL); + int n; + struct subre *sub; + struct dfa *d; + struct smalldfa sd; + chr *end; + + n = co - pcnfa->ncolors; + assert(n < v->g->nlacons && v->g->lacons != NULL); + FDEBUG(("=== testing lacon %d\n", n)); + sub = &v->g->lacons[n]; + d = newdfa(v, &sub->cnfa, &v->g->cmap, &sd); + if (d == NULL) { + ERR(REG_ESPACE); + return 0; + } + end = longest(v, d, cp, v->stop, (int *)NULL); + freedfa(d); + FDEBUG(("=== lacon %d match %d\n", n, (end != NULL))); + return (sub->subno) ? (end != NULL) : (end == NULL); } - + /* - getvacant - get a vacant state set * This routine clears out the inarcs and outarcs, but does not otherwise @@ -551,127 +650,167 @@ pcolor co; /* "color" of the lookahead constraint */ ^ static struct sset *getvacant(struct vars *, struct dfa *, chr *, chr *); */ static struct sset * -getvacant(v, d, cp, start) -struct vars *v; /* used only for debug flags */ -struct dfa *d; -chr *cp; -chr *start; +getvacant( + struct vars *v, /* used only for debug flags */ + struct dfa *d, + chr *cp, + chr *start) { - int i; - struct sset *ss; - struct sset *p; - struct arcp ap; - struct arcp lastap; - color co; - - ss = pickss(v, d, cp, start); - assert(!(ss->flags&LOCKED)); - - /* clear out its inarcs, including self-referential ones */ - ap = ss->ins; - while ((p = ap.ss) != NULL) { - co = ap.co; - FDEBUG(("zapping c%d's %ld outarc\n", p - d->ssets, (long)co)); - p->outs[co] = NULL; - ap = p->inchain[co]; - p->inchain[co].ss = NULL; /* paranoia */ + int i; + struct sset *ss; + struct sset *p; + struct arcp ap; + struct arcp lastap; + color co; + + ss = pickss(v, d, cp, start); + assert(!(ss->flags&LOCKED)); + + /* + * Clear out its inarcs, including self-referential ones. + */ + + ap = ss->ins; + while ((p = ap.ss) != NULL) { + co = ap.co; + FDEBUG(("zapping c%d's %ld outarc\n", p - d->ssets, (long)co)); + p->outs[co] = NULL; + ap = p->inchain[co]; + p->inchain[co].ss = NULL; /* paranoia */ + } + ss->ins.ss = NULL; + + /* + * Take it off the inarc chains of the ssets reached by its outarcs. + */ + + for (i = 0; i < d->ncolors; i++) { + p = ss->outs[i]; + assert(p != ss); /* not self-referential */ + if (p == NULL) { + continue; /* NOTE CONTINUE */ } - ss->ins.ss = NULL; - - /* take it off the inarc chains of the ssets reached by its outarcs */ - for (i = 0; i < d->ncolors; i++) { - p = ss->outs[i]; - assert(p != ss); /* not self-referential */ - if (p == NULL) - continue; /* NOTE CONTINUE */ - FDEBUG(("del outarc %d from c%d's in chn\n", i, p - d->ssets)); - if (p->ins.ss == ss && p->ins.co == i) - p->ins = ss->inchain[i]; - else { - assert(p->ins.ss != NULL); - for (ap = p->ins; ap.ss != NULL && - !(ap.ss == ss && ap.co == i); - ap = ap.ss->inchain[ap.co]) - lastap = ap; - assert(ap.ss != NULL); - lastap.ss->inchain[lastap.co] = ss->inchain[i]; - } - ss->outs[i] = NULL; - ss->inchain[i].ss = NULL; + FDEBUG(("del outarc %d from c%d's in chn\n", i, p - d->ssets)); + if (p->ins.ss == ss && p->ins.co == i) { + p->ins = ss->inchain[i]; + } else { + assert(p->ins.ss != NULL); + for (ap = p->ins; ap.ss != NULL && + !(ap.ss == ss && ap.co == i); + ap = ap.ss->inchain[ap.co]) { + lastap = ap; + } + assert(ap.ss != NULL); + lastap.ss->inchain[lastap.co] = ss->inchain[i]; } + ss->outs[i] = NULL; + ss->inchain[i].ss = NULL; + } - /* if ss was a success state, may need to remember location */ - if ((ss->flags&POSTSTATE) && ss->lastseen != d->lastpost && - (d->lastpost == NULL || d->lastpost < ss->lastseen)) - d->lastpost = ss->lastseen; + /* + * If ss was a success state, may need to remember location. + */ - /* likewise for a no-progress state */ - if ((ss->flags&NOPROGRESS) && ss->lastseen != d->lastnopr && - (d->lastnopr == NULL || d->lastnopr < ss->lastseen)) - d->lastnopr = ss->lastseen; + if ((ss->flags&POSTSTATE) && ss->lastseen != d->lastpost && + (d->lastpost == NULL || d->lastpost < ss->lastseen)) { + d->lastpost = ss->lastseen; + } - return ss; -} + /* + * Likewise for a no-progress state. + */ + if ((ss->flags&NOPROGRESS) && ss->lastseen != d->lastnopr && + (d->lastnopr == NULL || d->lastnopr < ss->lastseen)) { + d->lastnopr = ss->lastseen; + } + + return ss; +} + /* - pickss - pick the next stateset to be used ^ static struct sset *pickss(struct vars *, struct dfa *, chr *, chr *); */ static struct sset * -pickss(v, d, cp, start) -struct vars *v; /* used only for debug flags */ -struct dfa *d; -chr *cp; -chr *start; +pickss( + struct vars *v, /* used only for debug flags */ + struct dfa *d, + chr *cp, + chr *start) { - int i; - struct sset *ss; - struct sset *end; - chr *ancient; - - /* shortcut for cases where cache isn't full */ - if (d->nssused < d->nssets) { - i = d->nssused; - d->nssused++; - ss = &d->ssets[i]; - FDEBUG(("new c%d\n", i)); - /* set up innards */ - ss->states = &d->statesarea[i * d->wordsper]; - ss->flags = 0; - ss->ins.ss = NULL; - ss->ins.co = WHITE; /* give it some value */ - ss->outs = &d->outsarea[i * d->ncolors]; - ss->inchain = &d->incarea[i * d->ncolors]; - for (i = 0; i < d->ncolors; i++) { - ss->outs[i] = NULL; - ss->inchain[i].ss = NULL; - } - return ss; + int i; + struct sset *ss; + struct sset *end; + chr *ancient; + + /* + * Shortcut for cases where cache isn't full. + */ + + if (d->nssused < d->nssets) { + i = d->nssused; + d->nssused++; + ss = &d->ssets[i]; + FDEBUG(("new c%d\n", i)); + + /* + * Set up innards. + */ + + ss->states = &d->statesarea[i * d->wordsper]; + ss->flags = 0; + ss->ins.ss = NULL; + ss->ins.co = WHITE; /* give it some value */ + ss->outs = &d->outsarea[i * d->ncolors]; + ss->inchain = &d->incarea[i * d->ncolors]; + for (i = 0; i < d->ncolors; i++) { + ss->outs[i] = NULL; + ss->inchain[i].ss = NULL; + } + return ss; + } + + /* + * Look for oldest, or old enough anyway. + */ + + if (cp - start > d->nssets*2/3) { /* oldest 33% are expendable */ + ancient = cp - d->nssets*2/3; + } else { + ancient = start; + } + for (ss = d->search, end = &d->ssets[d->nssets]; ss < end; ss++) { + if ((ss->lastseen == NULL || ss->lastseen < ancient) + && !(ss->flags&LOCKED)) { + d->search = ss + 1; + FDEBUG(("replacing c%d\n", ss - d->ssets)); + return ss; } + } + for (ss = d->ssets, end = d->search; ss < end; ss++) { + if ((ss->lastseen == NULL || ss->lastseen < ancient) + && !(ss->flags&LOCKED)) { + d->search = ss + 1; + FDEBUG(("replacing c%d\n", ss - d->ssets)); + return ss; + } + } - /* look for oldest, or old enough anyway */ - if (cp - start > d->nssets*2/3) /* oldest 33% are expendable */ - ancient = cp - d->nssets*2/3; - else - ancient = start; - for (ss = d->search, end = &d->ssets[d->nssets]; ss < end; ss++) - if ((ss->lastseen == NULL || ss->lastseen < ancient) && - !(ss->flags&LOCKED)) { - d->search = ss + 1; - FDEBUG(("replacing c%d\n", ss - d->ssets)); - return ss; - } - for (ss = d->ssets, end = d->search; ss < end; ss++) - if ((ss->lastseen == NULL || ss->lastseen < ancient) && - !(ss->flags&LOCKED)) { - d->search = ss + 1; - FDEBUG(("replacing c%d\n", ss - d->ssets)); - return ss; - } + /* + * Nobody's old enough?!? -- something's really wrong. + */ - /* nobody's old enough?!? -- something's really wrong */ - FDEBUG(("can't find victim to replace!\n")); - assert(NOTREACHED); - ERR(REG_ASSERT); - return d->ssets; + FDEBUG(("can't find victim to replace!\n")); + assert(NOTREACHED); + ERR(REG_ASSERT); + return d->ssets; } + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ diff --git a/generic/regerror.c b/generic/regerror.c index 182830d..bbad8ec 100644 --- a/generic/regerror.c +++ b/generic/regerror.c @@ -2,20 +2,20 @@ * regerror - error-code expansion * * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. - * + * * Development of this software was funded, in part, by Cray Research Inc., * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics * Corporation, none of whom are responsible for the results. The author - * thanks all of them. - * + * thanks all of them. + * * Redistribution and use in source and binary forms -- with or without * modification -- are permitted for any purpose, provided that * redistributions in source form retain this entire copyright notice and * indicate the origin and nature of any modifications. - * - * I'd appreciate being given credit for this package in the documentation - * of software which uses it, but that is not a requirement. - * + * + * I'd appreciate being given credit for this package in the documentation of + * software which uses it, but that is not a requirement. + * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL @@ -31,79 +31,99 @@ #include "regguts.h" -/* unknown-error explanation */ +/* + * Unknown-error explanation. + */ + static char unk[] = "*** unknown regex error code 0x%x ***"; -/* struct to map among codes, code names, and explanations */ +/* + * Struct to map among codes, code names, and explanations. + */ + static struct rerr { - int code; - char *name; - char *explain; + int code; + char *name; + char *explain; } rerrs[] = { - /* the actual table is built from regex.h */ -# include "regerrs.h" - { -1, "", "oops" }, /* explanation special-cased in code */ + /* The actual table is built from regex.h */ +#include "regerrs.h" + { -1, "", "oops" }, /* explanation special-cased in code */ }; - + /* - regerror - the interface to error numbers */ /* ARGSUSED */ -size_t /* actual space needed (including NUL) */ -regerror(code, preg, errbuf, errbuf_size) -int code; /* error code, or REG_ATOI or REG_ITOA */ -CONST regex_t *preg; /* associated regex_t (unused at present) */ -char *errbuf; /* result buffer (unless errbuf_size==0) */ -size_t errbuf_size; /* available space in errbuf, can be 0 */ +size_t /* Actual space needed (including NUL) */ +regerror( + int code, /* Error code, or REG_ATOI or REG_ITOA */ + CONST regex_t *preg, /* Associated regex_t (unused at present) */ + char *errbuf, /* Result buffer (unless errbuf_size==0) */ + size_t errbuf_size) /* Available space in errbuf, can be 0 */ { - struct rerr *r; - char *msg; - char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */ - size_t len; - int icode; + struct rerr *r; + char *msg; + char convbuf[sizeof(unk)+50]; /* 50 = plenty for int */ + size_t len; + int icode; - switch (code) { - case REG_ATOI: /* convert name to number */ - for (r = rerrs; r->code >= 0; r++) - if (strcmp(r->name, errbuf) == 0) - break; - sprintf(convbuf, "%d", r->code); /* -1 for unknown */ - msg = convbuf; + switch (code) { + case REG_ATOI: /* Convert name to number */ + for (r = rerrs; r->code >= 0; r++) { + if (strcmp(r->name, errbuf) == 0) { break; - case REG_ITOA: /* convert number to name */ - icode = atoi(errbuf); /* not our problem if this fails */ - for (r = rerrs; r->code >= 0; r++) - if (r->code == icode) - break; - if (r->code >= 0) - msg = r->name; - else { /* unknown; tell him the number */ - sprintf(convbuf, "REG_%u", (unsigned)icode); - msg = convbuf; - } + } + } + sprintf(convbuf, "%d", r->code); /* -1 for unknown */ + msg = convbuf; + break; + case REG_ITOA: /* Convert number to name */ + icode = atoi(errbuf); /* Not our problem if this fails */ + for (r = rerrs; r->code >= 0; r++) { + if (r->code == icode) { break; - default: /* a real, normal error code */ - for (r = rerrs; r->code >= 0; r++) - if (r->code == code) - break; - if (r->code >= 0) - msg = r->explain; - else { /* unknown; say so */ - sprintf(convbuf, unk, code); - msg = convbuf; - } + } + } + if (r->code >= 0) { + msg = r->name; + } else { /* Unknown; tell him the number */ + sprintf(convbuf, "REG_%u", (unsigned)icode); + msg = convbuf; + } + break; + default: /* A real, normal error code */ + for (r = rerrs; r->code >= 0; r++) { + if (r->code == code) { break; + } + } + if (r->code >= 0) { + msg = r->explain; + } else { /* Unknown; say so */ + sprintf(convbuf, unk, code); + msg = convbuf; } + break; + } - len = strlen(msg) + 1; /* space needed, including NUL */ - if (errbuf_size > 0) { - if (errbuf_size > len) - strcpy(errbuf, msg); - else { /* truncate to fit */ - strncpy(errbuf, msg, errbuf_size-1); - errbuf[errbuf_size-1] = '\0'; - } + len = strlen(msg) + 1; /* Space needed, including NUL */ + if (errbuf_size > 0) { + if (errbuf_size > len) { + strcpy(errbuf, msg); + } else { /* Truncate to fit */ + strncpy(errbuf, msg, errbuf_size-1); + errbuf[errbuf_size-1] = '\0'; } + } - return len; + return len; } + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ diff --git a/generic/regexec.c b/generic/regexec.c index 5372fca..79536e1 100644 --- a/generic/regexec.c +++ b/generic/regexec.c @@ -2,20 +2,20 @@ * re_*exec and friends - match REs * * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. - * + * * Development of this software was funded, in part, by Cray Research Inc., * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics * Corporation, none of whom are responsible for the results. The author - * thanks all of them. - * + * thanks all of them. + * * Redistribution and use in source and binary forms -- with or without * modification -- are permitted for any purpose, provided that * redistributions in source form retain this entire copyright notice and * indicate the origin and nature of any modifications. - * - * I'd appreciate being given credit for this package in the documentation - * of software which uses it, but that is not a requirement. - * + * + * I'd appreciate being given credit for this package in the documentation of + * software which uses it, but that is not a requirement. + * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL @@ -26,97 +26,99 @@ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * */ #include "regguts.h" +/* + * Lazy-DFA representation. + */ - -/* lazy-DFA representation */ struct arcp { /* "pointer" to an outarc */ - struct sset *ss; - color co; + struct sset *ss; + color co; }; struct sset { /* state set */ - unsigned *states; /* pointer to bitvector */ - unsigned hash; /* hash of bitvector */ -# define HASH(bv, nw) (((nw) == 1) ? *(bv) : hash(bv, nw)) -# define HIT(h,bv,ss,nw) ((ss)->hash == (h) && ((nw) == 1 || \ - memcmp(VS(bv), VS((ss)->states), (nw)*sizeof(unsigned)) == 0)) - int flags; -# define STARTER 01 /* the initial state set */ -# define POSTSTATE 02 /* includes the goal state */ -# define LOCKED 04 /* locked in cache */ -# define NOPROGRESS 010 /* zero-progress state set */ - struct arcp ins; /* chain of inarcs pointing here */ - chr *lastseen; /* last entered on arrival here */ - struct sset **outs; /* outarc vector indexed by color */ - struct arcp *inchain; /* chain-pointer vector for outarcs */ + unsigned *states; /* pointer to bitvector */ + unsigned hash; /* hash of bitvector */ +#define HASH(bv, nw) (((nw) == 1) ? *(bv) : hash(bv, nw)) +#define HIT(h,bv,ss,nw) ((ss)->hash == (h) && ((nw) == 1 || \ + memcmp(VS(bv), VS((ss)->states), (nw)*sizeof(unsigned)) == 0)) + int flags; +#define STARTER 01 /* the initial state set */ +#define POSTSTATE 02 /* includes the goal state */ +#define LOCKED 04 /* locked in cache */ +#define NOPROGRESS 010 /* zero-progress state set */ + struct arcp ins; /* chain of inarcs pointing here */ + chr *lastseen; /* last entered on arrival here */ + struct sset **outs; /* outarc vector indexed by color */ + struct arcp *inchain; /* chain-pointer vector for outarcs */ }; struct dfa { - int nssets; /* size of cache */ - int nssused; /* how many entries occupied yet */ - int nstates; /* number of states */ - int ncolors; /* length of outarc and inchain vectors */ - int wordsper; /* length of state-set bitvectors */ - struct sset *ssets; /* state-set cache */ - unsigned *statesarea; /* bitvector storage */ - unsigned *work; /* pointer to work area within statesarea */ - struct sset **outsarea; /* outarc-vector storage */ - struct arcp *incarea; /* inchain storage */ - struct cnfa *cnfa; - struct colormap *cm; - chr *lastpost; /* location of last cache-flushed success */ - chr *lastnopr; /* location of last cache-flushed NOPROGRESS */ - struct sset *search; /* replacement-search-pointer memory */ - int cptsmalloced; /* were the areas individually malloced? */ - char *mallocarea; /* self, or master malloced area, or NULL */ + int nssets; /* size of cache */ + int nssused; /* how many entries occupied yet */ + int nstates; /* number of states */ + int ncolors; /* length of outarc and inchain vectors */ + int wordsper; /* length of state-set bitvectors */ + struct sset *ssets; /* state-set cache */ + unsigned *statesarea; /* bitvector storage */ + unsigned *work; /* pointer to work area within statesarea */ + struct sset **outsarea; /* outarc-vector storage */ + struct arcp *incarea; /* inchain storage */ + struct cnfa *cnfa; + struct colormap *cm; + chr *lastpost; /* location of last cache-flushed success */ + chr *lastnopr; /* location of last cache-flushed NOPROGRESS */ + struct sset *search; /* replacement-search-pointer memory */ + int cptsmalloced; /* were the areas individually malloced? */ + char *mallocarea; /* self, or master malloced area, or NULL */ }; #define WORK 1 /* number of work bitvectors needed */ -/* setup for non-malloc allocation for small cases */ +/* + * Setup for non-malloc allocation for small cases. + */ + #define FEWSTATES 20 /* must be less than UBITS */ #define FEWCOLORS 15 struct smalldfa { - struct dfa dfa; - struct sset ssets[FEWSTATES*2]; - unsigned statesarea[FEWSTATES*2 + WORK]; - struct sset *outsarea[FEWSTATES*2 * FEWCOLORS]; - struct arcp incarea[FEWSTATES*2 * FEWCOLORS]; + struct dfa dfa; + struct sset ssets[FEWSTATES*2]; + unsigned statesarea[FEWSTATES*2 + WORK]; + struct sset *outsarea[FEWSTATES*2 * FEWCOLORS]; + struct arcp incarea[FEWSTATES*2 * FEWCOLORS]; }; #define DOMALLOC ((struct smalldfa *)NULL) /* force malloc */ +/* + * Internal variables, bundled for easy passing around. + */ - -/* internal variables, bundled for easy passing around */ struct vars { - regex_t *re; - struct guts *g; - int eflags; /* copies of arguments */ - size_t nmatch; - regmatch_t *pmatch; - rm_detail_t *details; - chr *start; /* start of string */ - chr *stop; /* just past end of string */ - int err; /* error code if any (0 none) */ - regoff_t *mem; /* memory vector for backtracking */ - struct smalldfa dfa1; - struct smalldfa dfa2; + regex_t *re; + struct guts *g; + int eflags; /* copies of arguments */ + size_t nmatch; + regmatch_t *pmatch; + rm_detail_t *details; + chr *start; /* start of string */ + chr *stop; /* just past end of string */ + int err; /* error code if any (0 none) */ + regoff_t *mem; /* memory vector for backtracking */ + struct smalldfa dfa1; + struct smalldfa dfa2; }; -#define VISERR(vv) ((vv)->err != 0) /* have we seen an error yet? */ +#define VISERR(vv) ((vv)->err != 0) /* have we seen an error yet? */ #define ISERR() VISERR(v) -#define VERR(vv,e) (((vv)->err) ? (vv)->err : ((vv)->err = (e))) -#define ERR(e) VERR(v, e) /* record an error */ +#define VERR(vv,e) (((vv)->err) ? (vv)->err : ((vv)->err = (e))) +#define ERR(e) VERR(v, e) /* record an error */ #define NOERR() {if (ISERR()) return v->err;} /* if error seen, return it */ #define OFF(p) ((p) - v->start) #define LOFF(p) ((long)OFF(p)) - - - + /* * forward declarations */ @@ -152,887 +154,1056 @@ static struct sset *getvacant(struct vars *, struct dfa *, chr *, chr *); static struct sset *pickss(struct vars *, struct dfa *, chr *, chr *); /* automatically gathered by fwd; do not hand-edit */ /* =====^!^===== end forwards =====^!^===== */ - - - + /* - exec - match regular expression ^ int exec(regex_t *, CONST chr *, size_t, rm_detail_t *, ^ size_t, regmatch_t [], int); */ int -exec(re, string, len, details, nmatch, pmatch, flags) -regex_t *re; -CONST chr *string; -size_t len; -rm_detail_t *details; -size_t nmatch; -regmatch_t pmatch[]; -int flags; +exec( + regex_t *re, + CONST chr *string, + size_t len, + rm_detail_t *details, + size_t nmatch, + regmatch_t pmatch[], + int flags) { - struct vars var; - register struct vars *v = &var; - int st; - size_t n; - int backref; -# define LOCALMAT 20 - regmatch_t mat[LOCALMAT]; -# define LOCALMEM 40 - regoff_t mem[LOCALMEM]; - - /* sanity checks */ - if (re == NULL || string == NULL || re->re_magic != REMAGIC) - return REG_INVARG; - if (re->re_csize != sizeof(chr)) - return REG_MIXED; - - /* setup */ - v->re = re; - v->g = (struct guts *)re->re_guts; - if ((v->g->cflags®_EXPECT) && details == NULL) - return REG_INVARG; - if (v->g->info®_UIMPOSSIBLE) - return REG_NOMATCH; - backref = (v->g->info®_UBACKREF) ? 1 : 0; - v->eflags = flags; - if (v->g->cflags®_NOSUB) - nmatch = 0; /* override client */ - v->nmatch = nmatch; - if (backref) { - /* need work area */ - if (v->g->nsub + 1 <= LOCALMAT) - v->pmatch = mat; - else - v->pmatch = (regmatch_t *)MALLOC((v->g->nsub + 1) * - sizeof(regmatch_t)); - if (v->pmatch == NULL) - return REG_ESPACE; - v->nmatch = v->g->nsub + 1; - } else - v->pmatch = pmatch; - v->details = details; - v->start = (chr *)string; - v->stop = (chr *)string + len; - v->err = 0; - if (backref) { - /* need retry memory */ - assert(v->g->ntree >= 0); - n = (size_t)v->g->ntree; - if (n <= LOCALMEM) - v->mem = mem; - else - v->mem = (regoff_t *)MALLOC(n*sizeof(regoff_t)); - if (v->mem == NULL) { - if (v->pmatch != pmatch && v->pmatch != mat) - FREE(v->pmatch); - return REG_ESPACE; - } - } else - v->mem = NULL; - - /* do it */ - assert(v->g->tree != NULL); - if (backref) - st = cfind(v, &v->g->tree->cnfa, &v->g->cmap); - else - st = find(v, &v->g->tree->cnfa, &v->g->cmap); - - /* copy (portion of) match vector over if necessary */ - if (st == REG_OKAY && v->pmatch != pmatch && nmatch > 0) { - zapsubs(pmatch, nmatch); - n = (nmatch < v->nmatch) ? nmatch : v->nmatch; - memcpy(VS(pmatch), VS(v->pmatch), n*sizeof(regmatch_t)); + struct vars var; + register struct vars *v = &var; + int st; + size_t n; + int backref; +#define LOCALMAT 20 + regmatch_t mat[LOCALMAT]; +#define LOCALMEM 40 + regoff_t mem[LOCALMEM]; + + /* + * Sanity checks. + */ + + if (re == NULL || string == NULL || re->re_magic != REMAGIC) { + return REG_INVARG; + } + if (re->re_csize != sizeof(chr)) { + return REG_MIXED; + } + + /* + * Setup. + */ + + v->re = re; + v->g = (struct guts *)re->re_guts; + if ((v->g->cflags®_EXPECT) && details == NULL) { + return REG_INVARG; + } + if (v->g->info®_UIMPOSSIBLE) { + return REG_NOMATCH; + } + backref = (v->g->info®_UBACKREF) ? 1 : 0; + v->eflags = flags; + if (v->g->cflags®_NOSUB) { + nmatch = 0; /* override client */ + } + v->nmatch = nmatch; + if (backref) { + /* + * Need work area. + */ + + if (v->g->nsub + 1 <= LOCALMAT) { + v->pmatch = mat; + } else { + v->pmatch = (regmatch_t *) + MALLOC((v->g->nsub + 1) * sizeof(regmatch_t)); } - - /* clean up */ - if (v->pmatch != pmatch && v->pmatch != mat) + if (v->pmatch == NULL) { + return REG_ESPACE; + } + v->nmatch = v->g->nsub + 1; + } else { + v->pmatch = pmatch; + } + v->details = details; + v->start = (chr *)string; + v->stop = (chr *)string + len; + v->err = 0; + if (backref) { + /* + * Need retry memory. + */ + + assert(v->g->ntree >= 0); + n = (size_t)v->g->ntree; + if (n <= LOCALMEM) { + v->mem = mem; + } else { + v->mem = (regoff_t *) MALLOC(n*sizeof(regoff_t)); + } + if (v->mem == NULL) { + if (v->pmatch != pmatch && v->pmatch != mat) { FREE(v->pmatch); - if (v->mem != NULL && v->mem != mem) - FREE(v->mem); - return st; + } + return REG_ESPACE; + } + } else { + v->mem = NULL; + } + + /* + * Do it. + */ + + assert(v->g->tree != NULL); + if (backref) { + st = cfind(v, &v->g->tree->cnfa, &v->g->cmap); + } else { + st = find(v, &v->g->tree->cnfa, &v->g->cmap); + } + + /* + * Copy (portion of) match vector over if necessary. + */ + + if (st == REG_OKAY && v->pmatch != pmatch && nmatch > 0) { + zapsubs(pmatch, nmatch); + n = (nmatch < v->nmatch) ? nmatch : v->nmatch; + memcpy(VS(pmatch), VS(v->pmatch), n*sizeof(regmatch_t)); + } + + /* + * Clean up. + */ + + if (v->pmatch != pmatch && v->pmatch != mat) { + FREE(v->pmatch); + } + if (v->mem != NULL && v->mem != mem) { + FREE(v->mem); + } + return st; } - + /* - find - find a match for the main NFA (no-complications case) ^ static int find(struct vars *, struct cnfa *, struct colormap *); */ static int -find(v, cnfa, cm) -struct vars *v; -struct cnfa *cnfa; -struct colormap *cm; +find( + struct vars *v, + struct cnfa *cnfa, + struct colormap *cm) { - struct dfa *s; - struct dfa *d; - chr *begin; - chr *end = NULL; - chr *cold; - chr *open; /* open and close of range of possible starts */ - chr *close; - int hitend; - int shorter = (v->g->tree->flags&SHORTER) ? 1 : 0; - - /* first, a shot with the search RE */ - s = newdfa(v, &v->g->search, cm, &v->dfa1); - assert(!(ISERR() && s != NULL)); - NOERR(); - MDEBUG(("\nsearch at %ld\n", LOFF(v->start))); - cold = NULL; - close = shortest(v, s, v->start, v->start, v->stop, &cold, (int *)NULL); - freedfa(s); - NOERR(); - if (v->g->cflags®_EXPECT) { - assert(v->details != NULL); - if (cold != NULL) - v->details->rm_extend.rm_so = OFF(cold); - else - v->details->rm_extend.rm_so = OFF(v->stop); - v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */ + struct dfa *s; + struct dfa *d; + chr *begin; + chr *end = NULL; + chr *cold; + chr *open; /* Open and close of range of possible + * starts */ + chr *close; + int hitend; + int shorter = (v->g->tree->flags&SHORTER) ? 1 : 0; + + /* + * First, a shot with the search RE. + */ + + s = newdfa(v, &v->g->search, cm, &v->dfa1); + assert(!(ISERR() && s != NULL)); + NOERR(); + MDEBUG(("\nsearch at %ld\n", LOFF(v->start))); + cold = NULL; + close = shortest(v, s, v->start, v->start, v->stop, &cold, NULL); + freedfa(s); + NOERR(); + if (v->g->cflags®_EXPECT) { + assert(v->details != NULL); + if (cold != NULL) { + v->details->rm_extend.rm_so = OFF(cold); + } else { + v->details->rm_extend.rm_so = OFF(v->stop); + } + v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */ + } + if (close == NULL) { /* not found */ + return REG_NOMATCH; + } + if (v->nmatch == 0) { /* found, don't need exact location */ + return REG_OKAY; + } + + /* + * Find starting point and match. + */ + + assert(cold != NULL); + open = cold; + cold = NULL; + MDEBUG(("between %ld and %ld\n", LOFF(open), LOFF(close))); + d = newdfa(v, cnfa, cm, &v->dfa1); + assert(!(ISERR() && d != NULL)); + NOERR(); + for (begin = open; begin <= close; begin++) { + MDEBUG(("\nfind trying at %ld\n", LOFF(begin))); + if (shorter) { + end = shortest(v, d, begin, begin, v->stop, NULL, &hitend); + } else { + end = longest(v, d, begin, v->stop, &hitend); } - if (close == NULL) /* not found */ - return REG_NOMATCH; - if (v->nmatch == 0) /* found, don't need exact location */ - return REG_OKAY; - - /* find starting point and match */ - assert(cold != NULL); - open = cold; - cold = NULL; - MDEBUG(("between %ld and %ld\n", LOFF(open), LOFF(close))); - d = newdfa(v, cnfa, cm, &v->dfa1); - assert(!(ISERR() && d != NULL)); NOERR(); - for (begin = open; begin <= close; begin++) { - MDEBUG(("\nfind trying at %ld\n", LOFF(begin))); - if (shorter) - end = shortest(v, d, begin, begin, v->stop, - (chr **)NULL, &hitend); - else - end = longest(v, d, begin, v->stop, &hitend); - NOERR(); - if (hitend && cold == NULL) - cold = begin; - if (end != NULL) - break; /* NOTE BREAK OUT */ + if (hitend && cold == NULL) { + cold = begin; } - assert(end != NULL); /* search RE succeeded so loop should */ - freedfa(d); - - /* and pin down details */ - assert(v->nmatch > 0); - v->pmatch[0].rm_so = OFF(begin); - v->pmatch[0].rm_eo = OFF(end); - if (v->g->cflags®_EXPECT) { - if (cold != NULL) - v->details->rm_extend.rm_so = OFF(cold); - else - v->details->rm_extend.rm_so = OFF(v->stop); - v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */ + if (end != NULL) { + break; /* NOTE BREAK OUT */ + } + } + assert(end != NULL); /* search RE succeeded so loop should */ + freedfa(d); + + /* + * And pin down details. + */ + + assert(v->nmatch > 0); + v->pmatch[0].rm_so = OFF(begin); + v->pmatch[0].rm_eo = OFF(end); + if (v->g->cflags®_EXPECT) { + if (cold != NULL) { + v->details->rm_extend.rm_so = OFF(cold); + } else { + v->details->rm_extend.rm_so = OFF(v->stop); } - if (v->nmatch == 1) /* no need for submatches */ - return REG_OKAY; + v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */ + } + if (v->nmatch == 1) { /* no need for submatches */ + return REG_OKAY; + } - /* submatches */ - zapsubs(v->pmatch, v->nmatch); - return dissect(v, v->g->tree, begin, end); -} + /* + * Submatches. + */ + zapsubs(v->pmatch, v->nmatch); + return dissect(v, v->g->tree, begin, end); +} + /* - cfind - find a match for the main NFA (with complications) ^ static int cfind(struct vars *, struct cnfa *, struct colormap *); */ static int -cfind(v, cnfa, cm) -struct vars *v; -struct cnfa *cnfa; -struct colormap *cm; +cfind( + struct vars *v, + struct cnfa *cnfa, + struct colormap *cm) { - struct dfa *s; - struct dfa *d; - chr *cold; - int ret; - - s = newdfa(v, &v->g->search, cm, &v->dfa1); - NOERR(); - d = newdfa(v, cnfa, cm, &v->dfa2); - if (ISERR()) { - assert(d == NULL); - freedfa(s); - return v->err; - } - - ret = cfindloop(v, cnfa, cm, d, s, &cold); - - freedfa(d); + struct dfa *s; + struct dfa *d; + chr *cold; + int ret; + + s = newdfa(v, &v->g->search, cm, &v->dfa1); + NOERR(); + d = newdfa(v, cnfa, cm, &v->dfa2); + if (ISERR()) { + assert(d == NULL); freedfa(s); - NOERR(); - if (v->g->cflags®_EXPECT) { - assert(v->details != NULL); - if (cold != NULL) - v->details->rm_extend.rm_so = OFF(cold); - else - v->details->rm_extend.rm_so = OFF(v->stop); - v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */ + return v->err; + } + + ret = cfindloop(v, cnfa, cm, d, s, &cold); + + freedfa(d); + freedfa(s); + NOERR(); + if (v->g->cflags®_EXPECT) { + assert(v->details != NULL); + if (cold != NULL) { + v->details->rm_extend.rm_so = OFF(cold); + } else { + v->details->rm_extend.rm_so = OFF(v->stop); } - return ret; + v->details->rm_extend.rm_eo = OFF(v->stop); /* unknown */ + } + return ret; } - + /* - cfindloop - the heart of cfind ^ static int cfindloop(struct vars *, struct cnfa *, struct colormap *, ^ struct dfa *, struct dfa *, chr **); */ static int -cfindloop(v, cnfa, cm, d, s, coldp) -struct vars *v; -struct cnfa *cnfa; -struct colormap *cm; -struct dfa *d; -struct dfa *s; -chr **coldp; /* where to put coldstart pointer */ +cfindloop( + struct vars *v, + struct cnfa *cnfa, + struct colormap *cm, + struct dfa *d, + struct dfa *s, + chr **coldp) /* where to put coldstart pointer */ { - chr *begin; - chr *end; - chr *cold; - chr *open; /* open and close of range of possible starts */ - chr *close; - chr *estart; - chr *estop; - int er; - int shorter = v->g->tree->flags&SHORTER; - int hitend; - - assert(d != NULL && s != NULL); + chr *begin; + chr *end; + chr *cold; + chr *open; /* Open and close of range of possible + * starts */ + chr *close; + chr *estart; + chr *estop; + int er; + int shorter = v->g->tree->flags&SHORTER; + int hitend; + + assert(d != NULL && s != NULL); + cold = NULL; + close = v->start; + do { + MDEBUG(("\ncsearch at %ld\n", LOFF(close))); + close = shortest(v, s, close, close, v->stop, &cold, NULL); + if (close == NULL) { + break; /* NOTE BREAK */ + } + assert(cold != NULL); + open = cold; cold = NULL; - close = v->start; - do { - MDEBUG(("\ncsearch at %ld\n", LOFF(close))); - close = shortest(v, s, close, close, v->stop, &cold, (int *)NULL); - if (close == NULL) - break; /* NOTE BREAK */ - assert(cold != NULL); - open = cold; - cold = NULL; - MDEBUG(("cbetween %ld and %ld\n", LOFF(open), LOFF(close))); - for (begin = open; begin <= close; begin++) { - MDEBUG(("\ncfind trying at %ld\n", LOFF(begin))); - estart = begin; - estop = v->stop; - for (;;) { - if (shorter) - end = shortest(v, d, begin, estart, - estop, (chr **)NULL, &hitend); - else - end = longest(v, d, begin, estop, - &hitend); - if (hitend && cold == NULL) - cold = begin; - if (end == NULL) - break; /* NOTE BREAK OUT */ - MDEBUG(("tentative end %ld\n", LOFF(end))); - zapsubs(v->pmatch, v->nmatch); - zapmem(v, v->g->tree); - er = cdissect(v, v->g->tree, begin, end); - if (er == REG_OKAY) { - if (v->nmatch > 0) { - v->pmatch[0].rm_so = OFF(begin); - v->pmatch[0].rm_eo = OFF(end); - } - *coldp = cold; - return REG_OKAY; - } - if (er != REG_NOMATCH) { - ERR(er); - return er; - } - if ((shorter) ? end == estop : end == begin) { - /* no point in trying again */ - *coldp = cold; - return REG_NOMATCH; - } - /* go around and try again */ - if (shorter) - estart = end + 1; - else - estop = end - 1; - } + MDEBUG(("cbetween %ld and %ld\n", LOFF(open), LOFF(close))); + for (begin = open; begin <= close; begin++) { + MDEBUG(("\ncfind trying at %ld\n", LOFF(begin))); + estart = begin; + estop = v->stop; + for (;;) { + if (shorter) { + end = shortest(v, d, begin, estart, estop, NULL, &hitend); + } else { + end = longest(v, d, begin, estop, &hitend); + } + if (hitend && cold == NULL) { + cold = begin; + } + if (end == NULL) { + break; /* NOTE BREAK OUT */ } - } while (close < v->stop); - *coldp = cold; - return REG_NOMATCH; -} + MDEBUG(("tentative end %ld\n", LOFF(end))); + zapsubs(v->pmatch, v->nmatch); + zapmem(v, v->g->tree); + er = cdissect(v, v->g->tree, begin, end); + if (er == REG_OKAY) { + if (v->nmatch > 0) { + v->pmatch[0].rm_so = OFF(begin); + v->pmatch[0].rm_eo = OFF(end); + } + *coldp = cold; + return REG_OKAY; + } + if (er != REG_NOMATCH) { + ERR(er); + return er; + } + if ((shorter) ? end == estop : end == begin) { + /* + * No point in trying again. + */ + + *coldp = cold; + return REG_NOMATCH; + } + + /* + * Go around and try again + */ + if (shorter) { + estart = end + 1; + } else { + estop = end - 1; + } + } + } + } while (close < v->stop); + + *coldp = cold; + return REG_NOMATCH; +} + /* - zapsubs - initialize the subexpression matches to "no match" ^ static VOID zapsubs(regmatch_t *, size_t); */ -static VOID -zapsubs(p, n) -regmatch_t *p; -size_t n; +static void +zapsubs( + regmatch_t *p, + size_t n) { - size_t i; + size_t i; - for (i = n-1; i > 0; i--) { - p[i].rm_so = -1; - p[i].rm_eo = -1; - } + for (i = n-1; i > 0; i--) { + p[i].rm_so = -1; + p[i].rm_eo = -1; + } } - + /* - zapmem - initialize the retry memory of a subtree to zeros ^ static VOID zapmem(struct vars *, struct subre *); */ -static VOID -zapmem(v, t) -struct vars *v; -struct subre *t; +static void +zapmem( + struct vars *v, + struct subre *t) { - if (t == NULL) - return; - - assert(v->mem != NULL); - v->mem[t->retry] = 0; - if (t->op == '(') { - assert(t->subno > 0); - v->pmatch[t->subno].rm_so = -1; + if (t == NULL) { + return; + } + + assert(v->mem != NULL); + v->mem[t->retry] = 0; + if (t->op == '(') { + assert(t->subno > 0); + v->pmatch[t->subno].rm_so = -1; v->pmatch[t->subno].rm_eo = -1; - } - - if (t->left != NULL) - zapmem(v, t->left); - if (t->right != NULL) - zapmem(v, t->right); + } + + if (t->left != NULL) { + zapmem(v, t->left); + } + if (t->right != NULL) { + zapmem(v, t->right); + } } - + /* - subset - set any subexpression relevant to a successful subre ^ static VOID subset(struct vars *, struct subre *, chr *, chr *); */ -static VOID -subset(v, sub, begin, end) -struct vars *v; -struct subre *sub; -chr *begin; -chr *end; +static void +subset( + struct vars *v, + struct subre *sub, + chr *begin, + chr *end) { - int n = sub->subno; + int n = sub->subno; - assert(n > 0); - if ((size_t)n >= v->nmatch) - return; + assert(n > 0); + if ((size_t)n >= v->nmatch) { + return; + } - MDEBUG(("setting %d\n", n)); - v->pmatch[n].rm_so = OFF(begin); - v->pmatch[n].rm_eo = OFF(end); + MDEBUG(("setting %d\n", n)); + v->pmatch[n].rm_so = OFF(begin); + v->pmatch[n].rm_eo = OFF(end); } - + /* - dissect - determine subexpression matches (uncomplicated case) ^ static int dissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -dissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +dissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - assert(t != NULL); - MDEBUG(("dissect %ld-%ld\n", LOFF(begin), LOFF(end))); - - switch (t->op) { - case '=': /* terminal node */ - assert(t->left == NULL && t->right == NULL); - return REG_OKAY; /* no action, parent did the work */ - break; - case '|': /* alternation */ - assert(t->left != NULL); - return altdissect(v, t, begin, end); - break; - case 'b': /* back ref -- shouldn't be calling us! */ - return REG_ASSERT; - break; - case '.': /* concatenation */ - assert(t->left != NULL && t->right != NULL); - return condissect(v, t, begin, end); - break; - case '(': /* capturing */ - assert(t->left != NULL && t->right == NULL); - assert(t->subno > 0); - subset(v, t, begin, end); - return dissect(v, t->left, begin, end); - break; - default: - return REG_ASSERT; - break; - } + assert(t != NULL); + MDEBUG(("dissect %ld-%ld\n", LOFF(begin), LOFF(end))); + + switch (t->op) { + case '=': /* terminal node */ + assert(t->left == NULL && t->right == NULL); + return REG_OKAY; /* no action, parent did the work */ + break; + case '|': /* alternation */ + assert(t->left != NULL); + return altdissect(v, t, begin, end); + break; + case 'b': /* back ref -- shouldn't be calling us! */ + return REG_ASSERT; + break; + case '.': /* concatenation */ + assert(t->left != NULL && t->right != NULL); + return condissect(v, t, begin, end); + break; + case '(': /* capturing */ + assert(t->left != NULL && t->right == NULL); + assert(t->subno > 0); + subset(v, t, begin, end); + return dissect(v, t->left, begin, end); + break; + default: + return REG_ASSERT; + break; + } } - + /* - condissect - determine concatenation subexpression matches (uncomplicated) ^ static int condissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -condissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +condissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - struct dfa *d; - struct dfa *d2; - chr *mid; - int i; - int shorter = (t->left->flags&SHORTER) ? 1 : 0; - chr *stop = (shorter) ? end : begin; - - assert(t->op == '.'); - assert(t->left != NULL && t->left->cnfa.nstates > 0); - assert(t->right != NULL && t->right->cnfa.nstates > 0); - - d = newdfa(v, &t->left->cnfa, &v->g->cmap, &v->dfa1); - NOERR(); - d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, &v->dfa2); - if (ISERR()) { - assert(d2 == NULL); - freedfa(d); - return v->err; + struct dfa *d; + struct dfa *d2; + chr *mid; + int i; + int shorter = (t->left->flags&SHORTER) ? 1 : 0; + chr *stop = (shorter) ? end : begin; + + assert(t->op == '.'); + assert(t->left != NULL && t->left->cnfa.nstates > 0); + assert(t->right != NULL && t->right->cnfa.nstates > 0); + + d = newdfa(v, &t->left->cnfa, &v->g->cmap, &v->dfa1); + NOERR(); + d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, &v->dfa2); + if (ISERR()) { + assert(d2 == NULL); + freedfa(d); + return v->err; + } + + /* + * Pick a tentative midpoint. + */ + + if (shorter) { + mid = shortest(v, d, begin, begin, end, NULL, NULL); + } else { + mid = longest(v, d, begin, end, NULL); + } + if (mid == NULL) { + freedfa(d); + freedfa(d2); + return REG_ASSERT; + } + MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); + + /* + * Iterate until satisfaction or failure. + */ + + while (longest(v, d2, mid, end, NULL) != end) { + /* + * That midpoint didn't work, find a new one. + */ + + if (mid == stop) { + /* + * All possibilities exhausted! + */ + + MDEBUG(("no midpoint!\n")); + freedfa(d); + freedfa(d2); + return REG_ASSERT; } - - /* pick a tentative midpoint */ - if (shorter) - mid = shortest(v, d, begin, begin, end, (chr **)NULL, - (int *)NULL); - else - mid = longest(v, d, begin, end, (int *)NULL); - if (mid == NULL) { - freedfa(d); - freedfa(d2); - return REG_ASSERT; + if (shorter) { + mid = shortest(v, d, begin, mid+1, end, NULL, NULL); + } else { + mid = longest(v, d, begin, mid-1, NULL); } - MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); - - /* iterate until satisfaction or failure */ - while (longest(v, d2, mid, end, (int *)NULL) != end) { - /* that midpoint didn't work, find a new one */ - if (mid == stop) { - /* all possibilities exhausted! */ - MDEBUG(("no midpoint!\n")); - freedfa(d); - freedfa(d2); - return REG_ASSERT; - } - if (shorter) - mid = shortest(v, d, begin, mid+1, end, (chr **)NULL, - (int *)NULL); - else - mid = longest(v, d, begin, mid-1, (int *)NULL); - if (mid == NULL) { - /* failed to find a new one! */ - MDEBUG(("failed midpoint!\n")); - freedfa(d); - freedfa(d2); - return REG_ASSERT; - } - MDEBUG(("new midpoint %ld\n", LOFF(mid))); + if (mid == NULL) { + /* + * Failed to find a new one! + */ + + MDEBUG(("failed midpoint!\n")); + freedfa(d); + freedfa(d2); + return REG_ASSERT; } - - /* satisfaction */ - MDEBUG(("successful\n")); - freedfa(d); - freedfa(d2); - i = dissect(v, t->left, begin, mid); - if (i != REG_OKAY) - return i; - return dissect(v, t->right, mid, end); + MDEBUG(("new midpoint %ld\n", LOFF(mid))); + } + + /* + * Satisfaction. + */ + + MDEBUG(("successful\n")); + freedfa(d); + freedfa(d2); + i = dissect(v, t->left, begin, mid); + if (i != REG_OKAY) { + return i; + } + return dissect(v, t->right, mid, end); } - + /* - altdissect - determine alternative subexpression matches (uncomplicated) ^ static int altdissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -altdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +altdissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - struct dfa *d; - int i; - - assert(t != NULL); - assert(t->op == '|'); - - for (i = 0; t != NULL; t = t->right, i++) { - MDEBUG(("trying %dth\n", i)); - assert(t->left != NULL && t->left->cnfa.nstates > 0); - d = newdfa(v, &t->left->cnfa, &v->g->cmap, &v->dfa1); - if (ISERR()) - return v->err; - if (longest(v, d, begin, end, (int *)NULL) == end) { - MDEBUG(("success\n")); - freedfa(d); - return dissect(v, t->left, begin, end); - } - freedfa(d); + struct dfa *d; + int i; + + assert(t != NULL); + assert(t->op == '|'); + + for (i = 0; t != NULL; t = t->right, i++) { + MDEBUG(("trying %dth\n", i)); + assert(t->left != NULL && t->left->cnfa.nstates > 0); + d = newdfa(v, &t->left->cnfa, &v->g->cmap, &v->dfa1); + if (ISERR()) { + return v->err; } - return REG_ASSERT; /* none of them matched?!? */ + if (longest(v, d, begin, end, NULL) == end) { + MDEBUG(("success\n")); + freedfa(d); + return dissect(v, t->left, begin, end); + } + freedfa(d); + } + return REG_ASSERT; /* none of them matched?!? */ } - + /* - cdissect - determine subexpression matches (with complications) - * The retry memory stores the offset of the trial midpoint from begin, - * plus 1 so that 0 uniquely means "clean slate". + * The retry memory stores the offset of the trial midpoint from begin, plus 1 + * so that 0 uniquely means "clean slate". ^ static int cdissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -cdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +cdissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - int er; - - assert(t != NULL); - MDEBUG(("cdissect %ld-%ld %c\n", LOFF(begin), LOFF(end), t->op)); - - switch (t->op) { - case '=': /* terminal node */ - assert(t->left == NULL && t->right == NULL); - return REG_OKAY; /* no action, parent did the work */ - break; - case '|': /* alternation */ - assert(t->left != NULL); - return caltdissect(v, t, begin, end); - break; - case 'b': /* back ref -- shouldn't be calling us! */ - assert(t->left == NULL && t->right == NULL); - return cbrdissect(v, t, begin, end); - break; - case '.': /* concatenation */ - assert(t->left != NULL && t->right != NULL); - return ccondissect(v, t, begin, end); - break; - case '(': /* capturing */ - assert(t->left != NULL && t->right == NULL); - assert(t->subno > 0); - er = cdissect(v, t->left, begin, end); - if (er == REG_OKAY) - subset(v, t, begin, end); - return er; - break; - default: - return REG_ASSERT; - break; + int er; + + assert(t != NULL); + MDEBUG(("cdissect %ld-%ld %c\n", LOFF(begin), LOFF(end), t->op)); + + switch (t->op) { + case '=': /* terminal node */ + assert(t->left == NULL && t->right == NULL); + return REG_OKAY; /* no action, parent did the work */ + break; + case '|': /* alternation */ + assert(t->left != NULL); + return caltdissect(v, t, begin, end); + break; + case 'b': /* back ref -- shouldn't be calling us! */ + assert(t->left == NULL && t->right == NULL); + return cbrdissect(v, t, begin, end); + break; + case '.': /* concatenation */ + assert(t->left != NULL && t->right != NULL); + return ccondissect(v, t, begin, end); + break; + case '(': /* capturing */ + assert(t->left != NULL && t->right == NULL); + assert(t->subno > 0); + er = cdissect(v, t->left, begin, end); + if (er == REG_OKAY) { + subset(v, t, begin, end); } + return er; + break; + default: + return REG_ASSERT; + break; + } } - + /* - ccondissect - concatenation subexpression matches (with complications) - * The retry memory stores the offset of the trial midpoint from begin, - * plus 1 so that 0 uniquely means "clean slate". + * The retry memory stores the offset of the trial midpoint from begin, plus 1 + * so that 0 uniquely means "clean slate". ^ static int ccondissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -ccondissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +ccondissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - struct dfa *d; - struct dfa *d2; - chr *mid; - int er; - - assert(t->op == '.'); - assert(t->left != NULL && t->left->cnfa.nstates > 0); - assert(t->right != NULL && t->right->cnfa.nstates > 0); + struct dfa *d; + struct dfa *d2; + chr *mid; + int er; + + assert(t->op == '.'); + assert(t->left != NULL && t->left->cnfa.nstates > 0); + assert(t->right != NULL && t->right->cnfa.nstates > 0); + + if (t->left->flags&SHORTER) { /* reverse scan */ + return crevdissect(v, t, begin, end); + } + + d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); + if (ISERR()) { + return v->err; + } + d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, DOMALLOC); + if (ISERR()) { + freedfa(d); + return v->err; + } + MDEBUG(("cconcat %d\n", t->retry)); - if (t->left->flags&SHORTER) /* reverse scan */ - return crevdissect(v, t, begin, end); + /* + * Pick a tentative midpoint. + */ - d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) - return v->err; - d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) { - freedfa(d); - return v->err; + if (v->mem[t->retry] == 0) { + mid = longest(v, d, begin, end, NULL); + if (mid == NULL) { + freedfa(d); + freedfa(d2); + return REG_NOMATCH; } - MDEBUG(("cconcat %d\n", t->retry)); - - /* pick a tentative midpoint */ - if (v->mem[t->retry] == 0) { - mid = longest(v, d, begin, end, (int *)NULL); - if (mid == NULL) { - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - } else { - mid = begin + (v->mem[t->retry] - 1); - MDEBUG(("working midpoint %ld\n", LOFF(mid))); + MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); + v->mem[t->retry] = (mid - begin) + 1; + } else { + mid = begin + (v->mem[t->retry] - 1); + MDEBUG(("working midpoint %ld\n", LOFF(mid))); + } + + /* + * Iterate until satisfaction or failure. + */ + + for (;;) { + /* + * Try this midpoint on for size. + */ + + er = cdissect(v, t->left, begin, mid); + if ((er == REG_OKAY) && (longest(v, d2, mid, end, NULL) == end) + && (er = cdissect(v, t->right, mid, end)) == REG_OKAY) { + break; /* NOTE BREAK OUT */ + } + if ((er != REG_OKAY) && (er != REG_NOMATCH)) { + freedfa(d); + freedfa(d2); + return er; } - /* iterate until satisfaction or failure */ - for (;;) { - /* try this midpoint on for size */ - er = cdissect(v, t->left, begin, mid); - if (er == REG_OKAY && - longest(v, d2, mid, end, (int *)NULL) == end && - (er = cdissect(v, t->right, mid, end)) == - REG_OKAY) - break; /* NOTE BREAK OUT */ - if (er != REG_OKAY && er != REG_NOMATCH) { - freedfa(d); - freedfa(d2); - return er; - } + /* + * That midpoint didn't work, find a new one. + */ - /* that midpoint didn't work, find a new one */ - if (mid == begin) { - /* all possibilities exhausted */ - MDEBUG(("%d no midpoint\n", t->retry)); - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - mid = longest(v, d, begin, mid-1, (int *)NULL); - if (mid == NULL) { - /* failed to find a new one */ - MDEBUG(("%d failed midpoint\n", t->retry)); - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("%d: new midpoint %ld\n", t->retry, LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - zapmem(v, t->left); - zapmem(v, t->right); - } + if (mid == begin) { + /* + * All possibilities exhausted. + */ - /* satisfaction */ - MDEBUG(("successful\n")); - freedfa(d); - freedfa(d2); - return REG_OKAY; + MDEBUG(("%d no midpoint\n", t->retry)); + freedfa(d); + freedfa(d2); + return REG_NOMATCH; + } + mid = longest(v, d, begin, mid-1, NULL); + if (mid == NULL) { + /* + * Failed to find a new one. + */ + + MDEBUG(("%d failed midpoint\n", t->retry)); + freedfa(d); + freedfa(d2); + return REG_NOMATCH; + } + MDEBUG(("%d: new midpoint %ld\n", t->retry, LOFF(mid))); + v->mem[t->retry] = (mid - begin) + 1; + zapmem(v, t->left); + zapmem(v, t->right); + } + + /* + * Satisfaction. + */ + + MDEBUG(("successful\n")); + freedfa(d); + freedfa(d2); + return REG_OKAY; } - + /* - crevdissect - determine backref shortest-first subexpression matches - * The retry memory stores the offset of the trial midpoint from begin, - * plus 1 so that 0 uniquely means "clean slate". + * The retry memory stores the offset of the trial midpoint from begin, plus 1 + * so that 0 uniquely means "clean slate". ^ static int crevdissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -crevdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +crevdissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - struct dfa *d; - struct dfa *d2; - chr *mid; - int er; + struct dfa *d; + struct dfa *d2; + chr *mid; + int er; + + assert(t->op == '.'); + assert(t->left != NULL && t->left->cnfa.nstates > 0); + assert(t->right != NULL && t->right->cnfa.nstates > 0); + assert(t->left->flags&SHORTER); + + /* + * Concatenation -- need to split the substring between parts. + */ + + d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); + if (ISERR()) { + return v->err; + } + d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, DOMALLOC); + if (ISERR()) { + freedfa(d); + return v->err; + } + MDEBUG(("crev %d\n", t->retry)); - assert(t->op == '.'); - assert(t->left != NULL && t->left->cnfa.nstates > 0); - assert(t->right != NULL && t->right->cnfa.nstates > 0); - assert(t->left->flags&SHORTER); + /* + * Pick a tentative midpoint. + */ - /* concatenation -- need to split the substring between parts */ - d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) - return v->err; - d2 = newdfa(v, &t->right->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) { - freedfa(d); - return v->err; + if (v->mem[t->retry] == 0) { + mid = shortest(v, d, begin, begin, end, NULL, NULL); + if (mid == NULL) { + freedfa(d); + freedfa(d2); + return REG_NOMATCH; } - MDEBUG(("crev %d\n", t->retry)); - - /* pick a tentative midpoint */ - if (v->mem[t->retry] == 0) { - mid = shortest(v, d, begin, begin, end, (chr **)NULL, (int *)NULL); - if (mid == NULL) { - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - } else { - mid = begin + (v->mem[t->retry] - 1); - MDEBUG(("working midpoint %ld\n", LOFF(mid))); + MDEBUG(("tentative midpoint %ld\n", LOFF(mid))); + v->mem[t->retry] = (mid - begin) + 1; + } else { + mid = begin + (v->mem[t->retry] - 1); + MDEBUG(("working midpoint %ld\n", LOFF(mid))); + } + + /* + * Iterate until satisfaction or failure. + */ + + for (;;) { + /* + * Try this midpoint on for size. + */ + + er = cdissect(v, t->left, begin, mid); + if ((er == REG_OKAY) && (longest(v, d2, mid, end, NULL) == end) + && (er = cdissect(v, t->right, mid, end)) == REG_OKAY) { + break; /* NOTE BREAK OUT */ + } + if (er != REG_OKAY && er != REG_NOMATCH) { + freedfa(d); + freedfa(d2); + return er; } - /* iterate until satisfaction or failure */ - for (;;) { - /* try this midpoint on for size */ - er = cdissect(v, t->left, begin, mid); - if (er == REG_OKAY && - longest(v, d2, mid, end, (int *)NULL) == end && - (er = cdissect(v, t->right, mid, end)) == - REG_OKAY) - break; /* NOTE BREAK OUT */ - if (er != REG_OKAY && er != REG_NOMATCH) { - freedfa(d); - freedfa(d2); - return er; - } + /* + * That midpoint didn't work, find a new one. + */ - /* that midpoint didn't work, find a new one */ - if (mid == end) { - /* all possibilities exhausted */ - MDEBUG(("%d no midpoint\n", t->retry)); - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - mid = shortest(v, d, begin, mid+1, end, (chr **)NULL, (int *)NULL); - if (mid == NULL) { - /* failed to find a new one */ - MDEBUG(("%d failed midpoint\n", t->retry)); - freedfa(d); - freedfa(d2); - return REG_NOMATCH; - } - MDEBUG(("%d: new midpoint %ld\n", t->retry, LOFF(mid))); - v->mem[t->retry] = (mid - begin) + 1; - zapmem(v, t->left); - zapmem(v, t->right); - } + if (mid == end) { + /* + * All possibilities exhausted. + */ - /* satisfaction */ - MDEBUG(("successful\n")); - freedfa(d); - freedfa(d2); - return REG_OKAY; + MDEBUG(("%d no midpoint\n", t->retry)); + freedfa(d); + freedfa(d2); + return REG_NOMATCH; + } + mid = shortest(v, d, begin, mid+1, end, NULL, NULL); + if (mid == NULL) { + /* + * Failed to find a new one. + */ + + MDEBUG(("%d failed midpoint\n", t->retry)); + freedfa(d); + freedfa(d2); + return REG_NOMATCH; + } + MDEBUG(("%d: new midpoint %ld\n", t->retry, LOFF(mid))); + v->mem[t->retry] = (mid - begin) + 1; + zapmem(v, t->left); + zapmem(v, t->right); + } + + /* + * Satisfaction. + */ + + MDEBUG(("successful\n")); + freedfa(d); + freedfa(d2); + return REG_OKAY; } - + /* - cbrdissect - determine backref subexpression matches ^ static int cbrdissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -cbrdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +cbrdissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - int i; - int n = t->subno; - size_t len; - chr *paren; - chr *p; - chr *stop; - int min = t->min; - int max = t->max; - - assert(t != NULL); - assert(t->op == 'b'); - assert(n >= 0); - assert((size_t)n < v->nmatch); - - MDEBUG(("cbackref n%d %d{%d-%d}\n", t->retry, n, min, max)); - - if (v->pmatch[n].rm_so == -1) - return REG_NOMATCH; - paren = v->start + v->pmatch[n].rm_so; - len = v->pmatch[n].rm_eo - v->pmatch[n].rm_so; - - /* no room to maneuver -- retries are pointless */ - if (v->mem[t->retry]) - return REG_NOMATCH; - v->mem[t->retry] = 1; - - /* special-case zero-length string */ - if (len == 0) { - if (begin == end) - return REG_OKAY; - return REG_NOMATCH; + int i; + int n = t->subno; + size_t len; + chr *paren; + chr *p; + chr *stop; + int min = t->min; + int max = t->max; + + assert(t != NULL); + assert(t->op == 'b'); + assert(n >= 0); + assert((size_t)n < v->nmatch); + + MDEBUG(("cbackref n%d %d{%d-%d}\n", t->retry, n, min, max)); + + if (v->pmatch[n].rm_so == -1) { + return REG_NOMATCH; + } + paren = v->start + v->pmatch[n].rm_so; + len = v->pmatch[n].rm_eo - v->pmatch[n].rm_so; + + /* + * No room to maneuver -- retries are pointless. + */ + + if (v->mem[t->retry]) { + return REG_NOMATCH; + } + v->mem[t->retry] = 1; + + /* + * Special-case zero-length string. + */ + + if (len == 0) { + if (begin == end) { + return REG_OKAY; } + return REG_NOMATCH; + } + + /* + * And too-short string. + */ - /* and too-short string */ - assert(end >= begin); - if ((size_t)(end - begin) < len) - return REG_NOMATCH; - stop = end - len; - - /* count occurrences */ - i = 0; - for (p = begin; p <= stop && (i < max || max == INFINITY); p += len) { - if ((*v->g->compare)(paren, p, len) != 0) - break; - i++; + assert(end >= begin); + if ((size_t)(end - begin) < len) { + return REG_NOMATCH; + } + stop = end - len; + + /* + * Count occurrences. + */ + + i = 0; + for (p = begin; p <= stop && (i < max || max == INFINITY); p += len) { + if ((*v->g->compare)(paren, p, len) != 0) { + break; } - MDEBUG(("cbackref found %d\n", i)); - - /* and sort it out */ - if (p != end) /* didn't consume all of it */ - return REG_NOMATCH; - if (min <= i && (i <= max || max == INFINITY)) - return REG_OKAY; - return REG_NOMATCH; /* out of range */ -} + i++; + } + MDEBUG(("cbackref found %d\n", i)); + + /* + * And sort it out. + */ + if (p != end) { /* didn't consume all of it */ + return REG_NOMATCH; + } + if (min <= i && (i <= max || max == INFINITY)) { + return REG_OKAY; + } + return REG_NOMATCH; /* out of range */ +} + /* - caltdissect - determine alternative subexpression matches (w. complications) ^ static int caltdissect(struct vars *, struct subre *, chr *, chr *); */ static int /* regexec return code */ -caltdissect(v, t, begin, end) -struct vars *v; -struct subre *t; -chr *begin; /* beginning of relevant substring */ -chr *end; /* end of same */ +caltdissect( + struct vars *v, + struct subre *t, + chr *begin, /* beginning of relevant substring */ + chr *end) /* end of same */ { - struct dfa *d; - int er; -# define UNTRIED 0 /* not yet tried at all */ -# define TRYING 1 /* top matched, trying submatches */ -# define TRIED 2 /* top didn't match or submatches exhausted */ - - if (t == NULL) - return REG_NOMATCH; - assert(t->op == '|'); - if (v->mem[t->retry] == TRIED) - return caltdissect(v, t->right, begin, end); - - MDEBUG(("calt n%d\n", t->retry)); - assert(t->left != NULL); + struct dfa *d; + int er; +#define UNTRIED 0 /* not yet tried at all */ +#define TRYING 1 /* top matched, trying submatches */ +#define TRIED 2 /* top didn't match or submatches exhausted */ - if (v->mem[t->retry] == UNTRIED) { - d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); - if (ISERR()) - return v->err; - if (longest(v, d, begin, end, (int *)NULL) != end) { - freedfa(d); - v->mem[t->retry] = TRIED; - return caltdissect(v, t->right, begin, end); - } - freedfa(d); - MDEBUG(("calt matched\n")); - v->mem[t->retry] = TRYING; - } + if (t == NULL) { + return REG_NOMATCH; + } + assert(t->op == '|'); + if (v->mem[t->retry] == TRIED) { + return caltdissect(v, t->right, begin, end); + } - er = cdissect(v, t->left, begin, end); - if (er != REG_NOMATCH) - return er; + MDEBUG(("calt n%d\n", t->retry)); + assert(t->left != NULL); - v->mem[t->retry] = TRIED; - return caltdissect(v, t->right, begin, end); -} + if (v->mem[t->retry] == UNTRIED) { + d = newdfa(v, &t->left->cnfa, &v->g->cmap, DOMALLOC); + if (ISERR()) { + return v->err; + } + if (longest(v, d, begin, end, NULL) != end) { + freedfa(d); + v->mem[t->retry] = TRIED; + return caltdissect(v, t->right, begin, end); + } + freedfa(d); + MDEBUG(("calt matched\n")); + v->mem[t->retry] = TRYING; + } + er = cdissect(v, t->left, begin, end); + if (er != REG_NOMATCH) { + return er; + } + v->mem[t->retry] = TRIED; + return caltdissect(v, t->right, begin, end); +} #include "rege_dfa.c" + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ diff --git a/generic/regfree.c b/generic/regfree.c index 17a7389..b0aaa70 100644 --- a/generic/regfree.c +++ b/generic/regfree.c @@ -2,20 +2,20 @@ * regfree - free an RE * * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. - * + * * Development of this software was funded, in part, by Cray Research Inc., * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics * Corporation, none of whom are responsible for the results. The author - * thanks all of them. - * + * thanks all of them. + * * Redistribution and use in source and binary forms -- with or without * modification -- are permitted for any purpose, provided that * redistributions in source form retain this entire copyright notice and * indicate the origin and nature of any modifications. - * - * I'd appreciate being given credit for this package in the documentation - * of software which uses it, but that is not a requirement. - * + * + * I'd appreciate being given credit for this package in the documentation of + * software which uses it, but that is not a requirement. + * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL @@ -27,13 +27,11 @@ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * - * - * You might think that this could be incorporated into regcomp.c, and - * that would be a reasonable idea... except that this is a generic - * function (with a generic name), applicable to all compiled REs - * regardless of the size of their characters, whereas the stuff in - * regcomp.c gets compiled once per character size. + * You might think that this could be incorporated into regcomp.c, and that + * would be a reasonable idea... except that this is a generic function (with + * a generic name), applicable to all compiled REs regardless of the size of + * their characters, whereas the stuff in regcomp.c gets compiled once per + * character size. */ #include "regguts.h" @@ -43,11 +41,20 @@ * * Ignoring invocation with NULL is a convenience. */ -VOID -regfree(re) -regex_t *re; +void +regfree( + regex_t *re) { - if (re == NULL) - return; - (*((struct fns *)re->re_fns)->free)(re); + if (re == NULL) { + return; + } + (*((struct fns *)re->re_fns)->free)(re); } + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ diff --git a/generic/regfronts.c b/generic/regfronts.c index 82f48e2..5003297 100644 --- a/generic/regfronts.c +++ b/generic/regfronts.c @@ -1,24 +1,24 @@ /* * regcomp and regexec - front ends to re_ routines * - * Mostly for implementation of backward-compatibility kludges. Note - * that these routines exist ONLY in char versions. + * Mostly for implementation of backward-compatibility kludges. Note that + * these routines exist ONLY in char versions. * * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. - * + * * Development of this software was funded, in part, by Cray Research Inc., * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics * Corporation, none of whom are responsible for the results. The author - * thanks all of them. - * + * thanks all of them. + * * Redistribution and use in source and binary forms -- with or without * modification -- are permitted for any purpose, provided that * redistributions in source form retain this entire copyright notice and * indicate the origin and nature of any modifications. - * - * I'd appreciate being given credit for this package in the documentation - * of software which uses it, but that is not a requirement. - * + * + * I'd appreciate being given credit for this package in the documentation of + * software which uses it, but that is not a requirement. + * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL @@ -29,55 +29,63 @@ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * */ #include "regguts.h" - + /* - regcomp - compile regular expression */ int -regcomp(re, str, flags) -regex_t *re; -CONST char *str; -int flags; +regcomp( + regex_t *re, + CONST char *str, + int flags) { - size_t len; - int f = flags; + size_t len; + int f = flags; - if (f®_PEND) { - len = re->re_endp - str; - f &= ~REG_PEND; - } else - len = strlen(str); + if (f®_PEND) { + len = re->re_endp - str; + f &= ~REG_PEND; + } else { + len = strlen(str); + } - return re_comp(re, str, len, f); + return re_comp(re, str, len, f); } - + /* - regexec - execute regular expression */ int -regexec(re, str, nmatch, pmatch, flags) -regex_t *re; -CONST char *str; -size_t nmatch; -regmatch_t pmatch[]; -int flags; +regexec( + regex_t *re, + CONST char *str, + size_t nmatch, + regmatch_t pmatch[], + int flags) { - CONST char *start; - size_t len; - int f = flags; + CONST char *start; + size_t len; + int f = flags; - if (f®_STARTEND) { - start = str + pmatch[0].rm_so; - len = pmatch[0].rm_eo - pmatch[0].rm_so; - f &= ~REG_STARTEND; - } else { - start = str; - len = strlen(str); - } + if (f & REG_STARTEND) { + start = str + pmatch[0].rm_so; + len = pmatch[0].rm_eo - pmatch[0].rm_so; + f &= ~REG_STARTEND; + } else { + start = str; + len = strlen(str); + } - return re_exec(re, start, len, nmatch, pmatch, f); + return re_exec(re, start, len, nmatch, pmatch, f); } + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |