diff options
Diffstat (limited to 'generic/regexec.c')
| -rw-r--r-- | generic/regexec.c | 1781 |
1 files changed, 976 insertions, 805 deletions
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: + */ |