From 252107d91ff1d11c8df78f296691473d4a306e81 Mon Sep 17 00:00:00 2001 From: simonmar Date: Thu, 14 Feb 2002 13:59:21 +0000 Subject: [PATCH] [project @ 2002-02-14 13:59:21 by simonmar] Initial revision --- cbits/regex/engine.c | 1139 ++++++++++++++++++++++++++ cbits/regex/regcomp.c | 2088 ++++++++++++++++++++++++++++++++++++++++++++++++ cbits/regex/regerror.c | 177 ++++ cbits/regex/regexec.c | 181 +++++ cbits/regex/regfree.c | 87 ++ cbits/regex/utils.h | 57 ++ 6 files changed, 3729 insertions(+) create mode 100644 cbits/regex/engine.c create mode 100644 cbits/regex/regcomp.c create mode 100644 cbits/regex/regerror.c create mode 100644 cbits/regex/regexec.c create mode 100644 cbits/regex/regfree.c create mode 100644 cbits/regex/utils.h diff --git a/cbits/regex/engine.c b/cbits/regex/engine.c new file mode 100644 index 0000000..830f19b --- /dev/null +++ b/cbits/regex/engine.c @@ -0,0 +1,1139 @@ +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 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. + * + * @(#)engine.c 8.5 (Berkeley) 3/20/94 + * + * $FreeBSD: src/lib/libc/regex/engine.c,v 1.5.8.1 2000/07/31 06:30:37 dcs Exp $ + */ + +/* + * The matching engine and friends. This file is #included by regexec.c + * after suitable #defines of a variety of macros used herein, so that + * different state representations can be used without duplicating masses + * of code. + */ + +#ifdef SNAMES +#define matcher smatcher +#define fast sfast +#define slow sslow +#define dissect sdissect +#define backref sbackref +#define step sstep +#define print sprint +#define at sat +#define match smat +#endif +#ifdef LNAMES +#define matcher lmatcher +#define fast lfast +#define slow lslow +#define dissect ldissect +#define backref lbackref +#define step lstep +#define print lprint +#define at lat +#define match lmat +#endif + +/* another structure passed up and down to avoid zillions of parameters */ +struct match { + struct re_guts *g; + int eflags; + regmatch_t *pmatch; /* [nsub+1] (0 element unused) */ + char *offp; /* offsets work from here */ + char *beginp; /* start of string -- virtual NUL precedes */ + char *endp; /* end of string -- virtual NUL here */ + char *coldp; /* can be no match starting before here */ + char **lastpos; /* [nplus+1] */ + STATEVARS; + states st; /* current states */ + states fresh; /* states for a fresh start */ + states tmp; /* temporary */ + states empty; /* empty set of states */ +}; + +/* ========= begin header generated by ./mkh ========= */ +#ifdef __cplusplus +extern "C" { +#endif + +/* === engine.c === */ +static int matcher __P((struct re_guts *g, char *string, size_t nmatch, regmatch_t pmatch[], int eflags)); +static char *dissect __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst)); +static char *backref __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst, sopno lev)); +static char *fast __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst)); +static char *slow __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst)); +static states step __P((struct re_guts *g, sopno start, sopno stop, states bef, int ch, states aft)); +#define BOL (OUT+1) +#define EOL (BOL+1) +#define BOLEOL (BOL+2) +#define NOTHING (BOL+3) +#define BOW (BOL+4) +#define EOW (BOL+5) +#define CODEMAX (BOL+5) /* highest code used */ +#define NONCHAR(c) ((c) > CHAR_MAX) +#define NNONCHAR (CODEMAX-CHAR_MAX) +#ifdef REDEBUG +static void print __P((struct match *m, char *caption, states st, int ch, FILE *d)); +#endif +#ifdef REDEBUG +static void at __P((struct match *m, char *title, char *start, char *stop, sopno startst, sopno stopst)); +#endif +#ifdef REDEBUG +static char *pchar __P((int ch)); +#endif + +#ifdef __cplusplus +} +#endif +/* ========= end header generated by ./mkh ========= */ + +#ifdef REDEBUG +#define SP(t, s, c) print(m, t, s, c, stdout) +#define AT(t, p1, p2, s1, s2) at(m, t, p1, p2, s1, s2) +#define NOTE(str) { if (m->eflags®_TRACE) printf("=%s\n", (str)); } +#else +#define SP(t, s, c) /* nothing */ +#define AT(t, p1, p2, s1, s2) /* nothing */ +#define NOTE(s) /* nothing */ +#endif + +/* + - matcher - the actual matching engine + == static int matcher(register struct re_guts *g, char *string, \ + == size_t nmatch, regmatch_t pmatch[], int eflags); + */ +static int /* 0 success, REG_NOMATCH failure */ +matcher(g, string, nmatch, pmatch, eflags) +register struct re_guts *g; +char *string; +size_t nmatch; +regmatch_t pmatch[]; +int eflags; +{ + register char *endp; + register int i; + struct match mv; + register struct match *m = &mv; + register char *dp; + register const sopno gf = g->firststate+1; /* +1 for OEND */ + register const sopno gl = g->laststate; + char *start; + char *stop; + /* Boyer-Moore algorithms variables */ + register char *pp; + int cj, mj; + register char *mustfirst; + register char *mustlast; + register int *matchjump; + register int *charjump; + + /* simplify the situation where possible */ + if (g->cflags®_NOSUB) + nmatch = 0; + if (eflags®_STARTEND) { + start = string + pmatch[0].rm_so; + stop = string + pmatch[0].rm_eo; + } else { + start = string; + stop = start + strlen(start); + } + if (stop < start) + return(REG_INVARG); + + /* prescreening; this does wonders for this rather slow code */ + if (g->must != NULL) { + if (g->charjump != NULL && g->matchjump != NULL) { + mustfirst = g->must; + mustlast = g->must + g->mlen - 1; + charjump = g->charjump; + matchjump = g->matchjump; + pp = mustlast; + for (dp = start+g->mlen-1; dp < stop;) { + /* Fast skip non-matches */ + while (dp < stop && charjump[*dp]) + dp += charjump[*dp]; + + if (dp >= stop) + break; + + /* Greedy matcher */ + /* We depend on not being used for + * for strings of length 1 + */ + while (*--dp == *--pp && pp != mustfirst); + + if (*dp == *pp) + break; + + /* Jump to next possible match */ + mj = matchjump[pp - mustfirst]; + cj = charjump[*dp]; + dp += (cj < mj ? mj : cj); + pp = mustlast; + } + if (pp != mustfirst) + return(REG_NOMATCH); + } else { + for (dp = start; dp < stop; dp++) + if (*dp == g->must[0] && + stop - dp >= g->mlen && + memcmp(dp, g->must, (size_t)g->mlen) == 0) + break; + if (dp == stop) /* we didn't find g->must */ + return(REG_NOMATCH); + } + } + + /* match struct setup */ + m->g = g; + m->eflags = eflags; + m->pmatch = NULL; + m->lastpos = NULL; + m->offp = string; + m->beginp = start; + m->endp = stop; + STATESETUP(m, 4); + SETUP(m->st); + SETUP(m->fresh); + SETUP(m->tmp); + SETUP(m->empty); + CLEAR(m->empty); + + /* Adjust start according to moffset, to speed things up */ + if (g->moffset > -1) + start = ((dp - g->moffset) < start) ? start : dp - g->moffset; + + /* this loop does only one repetition except for backrefs */ + for (;;) { + endp = fast(m, start, stop, gf, gl); + if (endp == NULL) { /* a miss */ + STATETEARDOWN(m); + return(REG_NOMATCH); + } + if (nmatch == 0 && !g->backrefs) + break; /* no further info needed */ + + /* where? */ + assert(m->coldp != NULL); + for (;;) { + NOTE("finding start"); + endp = slow(m, m->coldp, stop, gf, gl); + if (endp != NULL) + break; + assert(m->coldp < m->endp); + m->coldp++; + } + if (nmatch == 1 && !g->backrefs) + break; /* no further info needed */ + + /* oh my, he wants the subexpressions... */ + if (m->pmatch == NULL) + m->pmatch = (regmatch_t *)malloc((m->g->nsub + 1) * + sizeof(regmatch_t)); + if (m->pmatch == NULL) { + STATETEARDOWN(m); + return(REG_ESPACE); + } + for (i = 1; i <= m->g->nsub; i++) + m->pmatch[i].rm_so = m->pmatch[i].rm_eo = -1; + if (!g->backrefs && !(m->eflags®_BACKR)) { + NOTE("dissecting"); + dp = dissect(m, m->coldp, endp, gf, gl); + } else { + if (g->nplus > 0 && m->lastpos == NULL) + m->lastpos = (char **)malloc((g->nplus+1) * + sizeof(char *)); + if (g->nplus > 0 && m->lastpos == NULL) { + free(m->pmatch); + STATETEARDOWN(m); + return(REG_ESPACE); + } + NOTE("backref dissect"); + dp = backref(m, m->coldp, endp, gf, gl, (sopno)0); + } + if (dp != NULL) + break; + + /* uh-oh... we couldn't find a subexpression-level match */ + assert(g->backrefs); /* must be back references doing it */ + assert(g->nplus == 0 || m->lastpos != NULL); + for (;;) { + if (dp != NULL || endp <= m->coldp) + break; /* defeat */ + NOTE("backoff"); + endp = slow(m, m->coldp, endp-1, gf, gl); + if (endp == NULL) + break; /* defeat */ + /* try it on a shorter possibility */ +#ifndef NDEBUG + for (i = 1; i <= m->g->nsub; i++) { + assert(m->pmatch[i].rm_so == -1); + assert(m->pmatch[i].rm_eo == -1); + } +#endif + NOTE("backoff dissect"); + dp = backref(m, m->coldp, endp, gf, gl, (sopno)0); + } + assert(dp == NULL || dp == endp); + if (dp != NULL) /* found a shorter one */ + break; + + /* despite initial appearances, there is no match here */ + NOTE("false alarm"); + start = m->coldp + 1; /* recycle starting later */ + assert(start <= stop); + } + + /* fill in the details if requested */ + if (nmatch > 0) { + pmatch[0].rm_so = m->coldp - m->offp; + pmatch[0].rm_eo = endp - m->offp; + } + if (nmatch > 1) { + assert(m->pmatch != NULL); + for (i = 1; i < nmatch; i++) + if (i <= m->g->nsub) + pmatch[i] = m->pmatch[i]; + else { + pmatch[i].rm_so = -1; + pmatch[i].rm_eo = -1; + } + } + + if (m->pmatch != NULL) + free((char *)m->pmatch); + if (m->lastpos != NULL) + free((char *)m->lastpos); + STATETEARDOWN(m); + return(0); +} + +/* + - dissect - figure out what matched what, no back references + == static char *dissect(register struct match *m, char *start, \ + == char *stop, sopno startst, sopno stopst); + */ +static char * /* == stop (success) always */ +dissect(m, start, stop, startst, stopst) +register struct match *m; +char *start; +char *stop; +sopno startst; +sopno stopst; +{ + register int i; + register sopno ss; /* start sop of current subRE */ + register sopno es; /* end sop of current subRE */ + register char *sp; /* start of string matched by it */ + register char *stp; /* string matched by it cannot pass here */ + register char *rest; /* start of rest of string */ + register char *tail; /* string unmatched by rest of RE */ + register sopno ssub; /* start sop of subsubRE */ + register sopno esub; /* end sop of subsubRE */ + register char *ssp; /* start of string matched by subsubRE */ + register char *sep; /* end of string matched by subsubRE */ + register char *oldssp; /* previous ssp */ + register char *dp; + + AT("diss", start, stop, startst, stopst); + sp = start; + for (ss = startst; ss < stopst; ss = es) { + /* identify end of subRE */ + es = ss; + switch (OP(m->g->strip[es])) { + case OPLUS_: + case OQUEST_: + es += OPND(m->g->strip[es]); + break; + case OCH_: + while (OP(m->g->strip[es]) != O_CH) + es += OPND(m->g->strip[es]); + break; + } + es++; + + /* figure out what it matched */ + switch (OP(m->g->strip[ss])) { + case OEND: + assert(nope); + break; + case OCHAR: + sp++; + break; + case OBOL: + case OEOL: + case OBOW: + case OEOW: + break; + case OANY: + case OANYOF: + sp++; + break; + case OBACK_: + case O_BACK: + assert(nope); + break; + /* cases where length of match is hard to find */ + case OQUEST_: + stp = stop; + for (;;) { + /* how long could this one be? */ + rest = slow(m, sp, stp, ss, es); + assert(rest != NULL); /* it did match */ + /* could the rest match the rest? */ + tail = slow(m, rest, stop, es, stopst); + if (tail == stop) + break; /* yes! */ + /* no -- try a shorter match for this one */ + stp = rest - 1; + assert(stp >= sp); /* it did work */ + } + ssub = ss + 1; + esub = es - 1; + /* did innards match? */ + if (slow(m, sp, rest, ssub, esub) != NULL) { + dp = dissect(m, sp, rest, ssub, esub); + assert(dp == rest); + } else /* no */ + assert(sp == rest); + sp = rest; + break; + case OPLUS_: + stp = stop; + for (;;) { + /* how long could this one be? */ + rest = slow(m, sp, stp, ss, es); + assert(rest != NULL); /* it did match */ + /* could the rest match the rest? */ + tail = slow(m, rest, stop, es, stopst); + if (tail == stop) + break; /* yes! */ + /* no -- try a shorter match for this one */ + stp = rest - 1; + assert(stp >= sp); /* it did work */ + } + ssub = ss + 1; + esub = es - 1; + ssp = sp; + oldssp = ssp; + for (;;) { /* find last match of innards */ + sep = slow(m, ssp, rest, ssub, esub); + if (sep == NULL || sep == ssp) + break; /* failed or matched null */ + oldssp = ssp; /* on to next try */ + ssp = sep; + } + if (sep == NULL) { + /* last successful match */ + sep = ssp; + ssp = oldssp; + } + assert(sep == rest); /* must exhaust substring */ + assert(slow(m, ssp, sep, ssub, esub) == rest); + dp = dissect(m, ssp, sep, ssub, esub); + assert(dp == sep); + sp = rest; + break; + case OCH_: + stp = stop; + for (;;) { + /* how long could this one be? */ + rest = slow(m, sp, stp, ss, es); + assert(rest != NULL); /* it did match */ + /* could the rest match the rest? */ + tail = slow(m, rest, stop, es, stopst); + if (tail == stop) + break; /* yes! */ + /* no -- try a shorter match for this one */ + stp = rest - 1; + assert(stp >= sp); /* it did work */ + } + ssub = ss + 1; + esub = ss + OPND(m->g->strip[ss]) - 1; + assert(OP(m->g->strip[esub]) == OOR1); + for (;;) { /* find first matching branch */ + if (slow(m, sp, rest, ssub, esub) == rest) + break; /* it matched all of it */ + /* that one missed, try next one */ + assert(OP(m->g->strip[esub]) == OOR1); + esub++; + assert(OP(m->g->strip[esub]) == OOR2); + ssub = esub + 1; + esub += OPND(m->g->strip[esub]); + if (OP(m->g->strip[esub]) == OOR2) + esub--; + else + assert(OP(m->g->strip[esub]) == O_CH); + } + dp = dissect(m, sp, rest, ssub, esub); + assert(dp == rest); + sp = rest; + break; + case O_PLUS: + case O_QUEST: + case OOR1: + case OOR2: + case O_CH: + assert(nope); + break; + case OLPAREN: + i = OPND(m->g->strip[ss]); + assert(0 < i && i <= m->g->nsub); + m->pmatch[i].rm_so = sp - m->offp; + break; + case ORPAREN: + i = OPND(m->g->strip[ss]); + assert(0 < i && i <= m->g->nsub); + m->pmatch[i].rm_eo = sp - m->offp; + break; + default: /* uh oh */ + assert(nope); + break; + } + } + + assert(sp == stop); + return(sp); +} + +/* + - backref - figure out what matched what, figuring in back references + == static char *backref(register struct match *m, char *start, \ + == char *stop, sopno startst, sopno stopst, sopno lev); + */ +static char * /* == stop (success) or NULL (failure) */ +backref(m, start, stop, startst, stopst, lev) +register struct match *m; +char *start; +char *stop; +sopno startst; +sopno stopst; +sopno lev; /* PLUS nesting level */ +{ + register int i; + register sopno ss; /* start sop of current subRE */ + register char *sp; /* start of string matched by it */ + register sopno ssub; /* start sop of subsubRE */ + register sopno esub; /* end sop of subsubRE */ + register char *ssp; /* start of string matched by subsubRE */ + register char *dp; + register size_t len; + register int hard; + register sop s; + register regoff_t offsave; + register cset *cs; + + AT("back", start, stop, startst, stopst); + sp = start; + + /* get as far as we can with easy stuff */ + hard = 0; + for (ss = startst; !hard && ss < stopst; ss++) + switch (OP(s = m->g->strip[ss])) { + case OCHAR: + if (sp == stop || *sp++ != (char)OPND(s)) + return(NULL); + break; + case OANY: + if (sp == stop) + return(NULL); + sp++; + break; + case OANYOF: + cs = &m->g->sets[OPND(s)]; + if (sp == stop || !CHIN(cs, *sp++)) + return(NULL); + break; + case OBOL: + if ( (sp == m->beginp && !(m->eflags®_NOTBOL)) || + (sp < m->endp && *(sp-1) == '\n' && + (m->g->cflags®_NEWLINE)) ) + { /* yes */ } + else + return(NULL); + break; + case OEOL: + if ( (sp == m->endp && !(m->eflags®_NOTEOL)) || + (sp < m->endp && *sp == '\n' && + (m->g->cflags®_NEWLINE)) ) + { /* yes */ } + else + return(NULL); + break; + case OBOW: + if (( (sp == m->beginp && !(m->eflags®_NOTBOL)) || + (sp < m->endp && *(sp-1) == '\n' && + (m->g->cflags®_NEWLINE)) || + (sp > m->beginp && + !ISWORD(*(sp-1))) ) && + (sp < m->endp && ISWORD(*sp)) ) + { /* yes */ } + else + return(NULL); + break; + case OEOW: + if (( (sp == m->endp && !(m->eflags®_NOTEOL)) || + (sp < m->endp && *sp == '\n' && + (m->g->cflags®_NEWLINE)) || + (sp < m->endp && !ISWORD(*sp)) ) && + (sp > m->beginp && ISWORD(*(sp-1))) ) + { /* yes */ } + else + return(NULL); + break; + case O_QUEST: + break; + case OOR1: /* matches null but needs to skip */ + ss++; + s = m->g->strip[ss]; + do { + assert(OP(s) == OOR2); + ss += OPND(s); + } while (OP(s = m->g->strip[ss]) != O_CH); + /* note that the ss++ gets us past the O_CH */ + break; + default: /* have to make a choice */ + hard = 1; + break; + } + if (!hard) { /* that was it! */ + if (sp != stop) + return(NULL); + return(sp); + } + ss--; /* adjust for the for's final increment */ + + /* the hard stuff */ + AT("hard", sp, stop, ss, stopst); + s = m->g->strip[ss]; + switch (OP(s)) { + case OBACK_: /* the vilest depths */ + i = OPND(s); + assert(0 < i && i <= m->g->nsub); + if (m->pmatch[i].rm_eo == -1) + return(NULL); + assert(m->pmatch[i].rm_so != -1); + len = m->pmatch[i].rm_eo - m->pmatch[i].rm_so; + assert(stop - m->beginp >= len); + if (sp > stop - len) + return(NULL); /* not enough left to match */ + ssp = m->offp + m->pmatch[i].rm_so; + if (memcmp(sp, ssp, len) != 0) + return(NULL); + while (m->g->strip[ss] != SOP(O_BACK, i)) + ss++; + return(backref(m, sp+len, stop, ss+1, stopst, lev)); + break; + case OQUEST_: /* to null or not */ + dp = backref(m, sp, stop, ss+1, stopst, lev); + if (dp != NULL) + return(dp); /* not */ + return(backref(m, sp, stop, ss+OPND(s)+1, stopst, lev)); + break; + case OPLUS_: + assert(m->lastpos != NULL); + assert(lev+1 <= m->g->nplus); + m->lastpos[lev+1] = sp; + return(backref(m, sp, stop, ss+1, stopst, lev+1)); + break; + case O_PLUS: + if (sp == m->lastpos[lev]) /* last pass matched null */ + return(backref(m, sp, stop, ss+1, stopst, lev-1)); + /* try another pass */ + m->lastpos[lev] = sp; + dp = backref(m, sp, stop, ss-OPND(s)+1, stopst, lev); + if (dp == NULL) + return(backref(m, sp, stop, ss+1, stopst, lev-1)); + else + return(dp); + break; + case OCH_: /* find the right one, if any */ + ssub = ss + 1; + esub = ss + OPND(s) - 1; + assert(OP(m->g->strip[esub]) == OOR1); + for (;;) { /* find first matching branch */ + dp = backref(m, sp, stop, ssub, esub, lev); + if (dp != NULL) + return(dp); + /* that one missed, try next one */ + if (OP(m->g->strip[esub]) == O_CH) + return(NULL); /* there is none */ + esub++; + assert(OP(m->g->strip[esub]) == OOR2); + ssub = esub + 1; + esub += OPND(m->g->strip[esub]); + if (OP(m->g->strip[esub]) == OOR2) + esub--; + else + assert(OP(m->g->strip[esub]) == O_CH); + } + break; + case OLPAREN: /* must undo assignment if rest fails */ + i = OPND(s); + assert(0 < i && i <= m->g->nsub); + offsave = m->pmatch[i].rm_so; + m->pmatch[i].rm_so = sp - m->offp; + dp = backref(m, sp, stop, ss+1, stopst, lev); + if (dp != NULL) + return(dp); + m->pmatch[i].rm_so = offsave; + return(NULL); + break; + case ORPAREN: /* must undo assignment if rest fails */ + i = OPND(s); + assert(0 < i && i <= m->g->nsub); + offsave = m->pmatch[i].rm_eo; + m->pmatch[i].rm_eo = sp - m->offp; + dp = backref(m, sp, stop, ss+1, stopst, lev); + if (dp != NULL) + return(dp); + m->pmatch[i].rm_eo = offsave; + return(NULL); + break; + default: /* uh oh */ + assert(nope); + break; + } + + /* "can't happen" */ + assert(nope); + /* NOTREACHED */ + return "shut up gcc"; +} + +/* + - fast - step through the string at top speed + == static char *fast(register struct match *m, char *start, \ + == char *stop, sopno startst, sopno stopst); + */ +static char * /* where tentative match ended, or NULL */ +fast(m, start, stop, startst, stopst) +register struct match *m; +char *start; +char *stop; +sopno startst; +sopno stopst; +{ + register states st = m->st; + register states fresh = m->fresh; + register states tmp = m->tmp; + register char *p = start; + register int c = (start == m->beginp) ? OUT : *(start-1); + register int lastc; /* previous c */ + register int flagch; + register int i; + register char *coldp; /* last p after which no match was underway */ + + CLEAR(st); + SET1(st, startst); + st = step(m->g, startst, stopst, st, NOTHING, st); + ASSIGN(fresh, st); + SP("start", st, *p); + coldp = NULL; + for (;;) { + /* next character */ + lastc = c; + c = (p == m->endp) ? OUT : *p; + if (EQ(st, fresh)) + coldp = p; + + /* is there an EOL and/or BOL between lastc and c? */ + flagch = '\0'; + i = 0; + if ( (lastc == '\n' && m->g->cflags®_NEWLINE) || + (lastc == OUT && !(m->eflags®_NOTBOL)) ) { + flagch = BOL; + i = m->g->nbol; + } + if ( (c == '\n' && m->g->cflags®_NEWLINE) || + (c == OUT && !(m->eflags®_NOTEOL)) ) { + flagch = (flagch == BOL) ? BOLEOL : EOL; + i += m->g->neol; + } + if (i != 0) { + for (; i > 0; i--) + st = step(m->g, startst, stopst, st, flagch, st); + SP("boleol", st, c); + } + + /* how about a word boundary? */ + if ( (flagch == BOL || (lastc != OUT && !ISWORD(lastc))) && + (c != OUT && ISWORD(c)) ) { + flagch = BOW; + } + if ( (lastc != OUT && ISWORD(lastc)) && + (flagch == EOL || (c != OUT && !ISWORD(c))) ) { + flagch = EOW; + } + if (flagch == BOW || flagch == EOW) { + st = step(m->g, startst, stopst, st, flagch, st); + SP("boweow", st, c); + } + + /* are we done? */ + if (ISSET(st, stopst) || p == stop) + break; /* NOTE BREAK OUT */ + + /* no, we must deal with this character */ + ASSIGN(tmp, st); + ASSIGN(st, fresh); + assert(c != OUT); + st = step(m->g, startst, stopst, tmp, c, st); + SP("aft", st, c); + assert(EQ(step(m->g, startst, stopst, st, NOTHING, st), st)); + p++; + } + + assert(coldp != NULL); + m->coldp = coldp; + if (ISSET(st, stopst)) + return(p+1); + else + return(NULL); +} + +/* + - slow - step through the string more deliberately + == static char *slow(register struct match *m, char *start, \ + == char *stop, sopno startst, sopno stopst); + */ +static char * /* where it ended */ +slow(m, start, stop, startst, stopst) +register struct match *m; +char *start; +char *stop; +sopno startst; +sopno stopst; +{ + register states st = m->st; + register states empty = m->empty; + register states tmp = m->tmp; + register char *p = start; + register int c = (start == m->beginp) ? OUT : *(start-1); + register int lastc; /* previous c */ + register int flagch; + register int i; + register char *matchp; /* last p at which a match ended */ + + AT("slow", start, stop, startst, stopst); + CLEAR(st); + SET1(st, startst); + SP("sstart", st, *p); + st = step(m->g, startst, stopst, st, NOTHING, st); + matchp = NULL; + for (;;) { + /* next character */ + lastc = c; + c = (p == m->endp) ? OUT : *p; + + /* is there an EOL and/or BOL between lastc and c? */ + flagch = '\0'; + i = 0; + if ( (lastc == '\n' && m->g->cflags®_NEWLINE) || + (lastc == OUT && !(m->eflags®_NOTBOL)) ) { + flagch = BOL; + i = m->g->nbol; + } + if ( (c == '\n' && m->g->cflags®_NEWLINE) || + (c == OUT && !(m->eflags®_NOTEOL)) ) { + flagch = (flagch == BOL) ? BOLEOL : EOL; + i += m->g->neol; + } + if (i != 0) { + for (; i > 0; i--) + st = step(m->g, startst, stopst, st, flagch, st); + SP("sboleol", st, c); + } + + /* how about a word boundary? */ + if ( (flagch == BOL || (lastc != OUT && !ISWORD(lastc))) && + (c != OUT && ISWORD(c)) ) { + flagch = BOW; + } + if ( (lastc != OUT && ISWORD(lastc)) && + (flagch == EOL || (c != OUT && !ISWORD(c))) ) { + flagch = EOW; + } + if (flagch == BOW || flagch == EOW) { + st = step(m->g, startst, stopst, st, flagch, st); + SP("sboweow", st, c); + } + + /* are we done? */ + if (ISSET(st, stopst)) + matchp = p; + if (EQ(st, empty) || p == stop) + break; /* NOTE BREAK OUT */ + + /* no, we must deal with this character */ + ASSIGN(tmp, st); + ASSIGN(st, empty); + assert(c != OUT); + st = step(m->g, startst, stopst, tmp, c, st); + SP("saft", st, c); + assert(EQ(step(m->g, startst, stopst, st, NOTHING, st), st)); + p++; + } + + return(matchp); +} + + +/* + - step - map set of states reachable before char to set reachable after + == static states step(register struct re_guts *g, sopno start, sopno stop, \ + == register states bef, int ch, register states aft); + == #define BOL (OUT+1) + == #define EOL (BOL+1) + == #define BOLEOL (BOL+2) + == #define NOTHING (BOL+3) + == #define BOW (BOL+4) + == #define EOW (BOL+5) + == #define CODEMAX (BOL+5) // highest code used + == #define NONCHAR(c) ((c) > CHAR_MAX) + == #define NNONCHAR (CODEMAX-CHAR_MAX) + */ +static states +step(g, start, stop, bef, ch, aft) +register struct re_guts *g; +sopno start; /* start state within strip */ +sopno stop; /* state after stop state within strip */ +register states bef; /* states reachable before */ +int ch; /* character or NONCHAR code */ +register states aft; /* states already known reachable after */ +{ + register cset *cs; + register sop s; + register sopno pc; + register onestate here; /* note, macros know this name */ + register sopno look; + register int i; + + for (pc = start, INIT(here, pc); pc != stop; pc++, INC(here)) { + s = g->strip[pc]; + switch (OP(s)) { + case OEND: + assert(pc == stop-1); + break; + case OCHAR: + /* only characters can match */ + assert(!NONCHAR(ch) || ch != (char)OPND(s)); + if (ch == (char)OPND(s)) + FWD(aft, bef, 1); + break; + case OBOL: + if (ch == BOL || ch == BOLEOL) + FWD(aft, bef, 1); + break; + case OEOL: + if (ch == EOL || ch == BOLEOL) + FWD(aft, bef, 1); + break; + case OBOW: + if (ch == BOW) + FWD(aft, bef, 1); + break; + case OEOW: + if (ch == EOW) + FWD(aft, bef, 1); + break; + case OANY: + if (!NONCHAR(ch)) + FWD(aft, bef, 1); + break; + case OANYOF: + cs = &g->sets[OPND(s)]; + if (!NONCHAR(ch) && CHIN(cs, ch)) + FWD(aft, bef, 1); + break; + case OBACK_: /* ignored here */ + case O_BACK: + FWD(aft, aft, 1); + break; + case OPLUS_: /* forward, this is just an empty */ + FWD(aft, aft, 1); + break; + case O_PLUS: /* both forward and back */ + FWD(aft, aft, 1); + i = ISSETBACK(aft, OPND(s)); + BACK(aft, aft, OPND(s)); + if (!i && ISSETBACK(aft, OPND(s))) { + /* oho, must reconsider loop body */ + pc -= OPND(s) + 1; + INIT(here, pc); + } + break; + case OQUEST_: /* two branches, both forward */ + FWD(aft, aft, 1); + FWD(aft, aft, OPND(s)); + break; + case O_QUEST: /* just an empty */ + FWD(aft, aft, 1); + break; + case OLPAREN: /* not significant here */ + case ORPAREN: + FWD(aft, aft, 1); + break; + case OCH_: /* mark the first two branches */ + FWD(aft, aft, 1); + assert(OP(g->strip[pc+OPND(s)]) == OOR2); + FWD(aft, aft, OPND(s)); + break; + case OOR1: /* done a branch, find the O_CH */ + if (ISSTATEIN(aft, here)) { + for (look = 1; + OP(s = g->strip[pc+look]) != O_CH; + look += OPND(s)) + assert(OP(s) == OOR2); + FWD(aft, aft, look); + } + break; + case OOR2: /* propagate OCH_'s marking */ + FWD(aft, aft, 1); + if (OP(g->strip[pc+OPND(s)]) != O_CH) { + assert(OP(g->strip[pc+OPND(s)]) == OOR2); + FWD(aft, aft, OPND(s)); + } + break; + case O_CH: /* just empty */ + FWD(aft, aft, 1); + break; + default: /* ooooops... */ + assert(nope); + break; + } + } + + return(aft); +} + +#ifdef REDEBUG +/* + - print - print a set of states + == #ifdef REDEBUG + == static void print(struct match *m, char *caption, states st, \ + == int ch, FILE *d); + == #endif + */ +static void +print(m, caption, st, ch, d) +struct match *m; +char *caption; +states st; +int ch; +FILE *d; +{ + register struct re_guts *g = m->g; + register int i; + register int first = 1; + + if (!(m->eflags®_TRACE)) + return; + + fprintf(d, "%s", caption); + if (ch != '\0') + fprintf(d, " %s", pchar(ch)); + for (i = 0; i < g->nstates; i++) + if (ISSET(st, i)) { + fprintf(d, "%s%d", (first) ? "\t" : ", ", i); + first = 0; + } + fprintf(d, "\n"); +} + +/* + - at - print current situation + == #ifdef REDEBUG + == static void at(struct match *m, char *title, char *start, char *stop, \ + == sopno startst, sopno stopst); + == #endif + */ +static void +at(m, title, start, stop, startst, stopst) +struct match *m; +char *title; +char *start; +char *stop; +sopno startst; +sopno stopst; +{ + if (!(m->eflags®_TRACE)) + return; + + printf("%s %s-", title, pchar(*start)); + printf("%s ", pchar(*stop)); + printf("%ld-%ld\n", (long)startst, (long)stopst); +} + +#ifndef PCHARDONE +#define PCHARDONE /* never again */ +/* + - pchar - make a character printable + == #ifdef REDEBUG + == static char *pchar(int ch); + == #endif + * + * Is this identical to regchar() over in debug.c? Well, yes. But a + * duplicate here avoids having a debugging-capable regexec.o tied to + * a matching debug.o, and this is convenient. It all disappears in + * the non-debug compilation anyway, so it doesn't matter much. + */ +static char * /* -> representation */ +pchar(ch) +int ch; +{ + static char pbuf[10]; + + if (isprint((uch)ch) || ch == ' ') + sprintf(pbuf, "%c", ch); + else + sprintf(pbuf, "\\%o", ch); + return(pbuf); +} +#endif +#endif + +#undef matcher +#undef fast +#undef slow +#undef dissect +#undef backref +#undef step +#undef print +#undef at +#undef match diff --git a/cbits/regex/regcomp.c b/cbits/regex/regcomp.c new file mode 100644 index 0000000..3b50772 --- /dev/null +++ b/cbits/regex/regcomp.c @@ -0,0 +1,2088 @@ +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 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. + * + * @(#)regcomp.c 8.5 (Berkeley) 3/20/94 + * + * $FreeBSD: src/lib/libc/regex/regcomp.c,v 1.13.2.1 2000/07/31 06:30:37 dcs Exp $ + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regcomp.c 8.5 (Berkeley) 3/20/94"; +#endif /* LIBC_SCCS and not lint */ + +#include +#include +#include +#include +#include +#include +#include + +#include "collate.h" + +#include "utils.h" +#include "regex2.h" + +#include "cclass.h" +#include "cname.h" + +/* + * parse structure, passed up and down to avoid global variables and + * other clumsinesses + */ +struct parse { + char *next; /* next character in RE */ + char *end; /* end of string (-> NUL normally) */ + int error; /* has an error been seen? */ + sop *strip; /* malloced strip */ + sopno ssize; /* malloced strip size (allocated) */ + sopno slen; /* malloced strip length (used) */ + int ncsalloc; /* number of csets allocated */ + struct re_guts *g; +# define NPAREN 10 /* we need to remember () 1-9 for back refs */ + sopno pbegin[NPAREN]; /* -> ( ([0] unused) */ + sopno pend[NPAREN]; /* -> ) ([0] unused) */ +}; + +/* ========= begin header generated by ./mkh ========= */ +#ifdef __cplusplus +extern "C" { +#endif + +/* === regcomp.c === */ +static void p_ere __P((struct parse *p, int stop)); +static void p_ere_exp __P((struct parse *p)); +static void p_str __P((struct parse *p)); +static void p_bre __P((struct parse *p, int end1, int end2)); +static int p_simp_re __P((struct parse *p, int starordinary)); +static int p_count __P((struct parse *p)); +static void p_bracket __P((struct parse *p)); +static void p_b_term __P((struct parse *p, cset *cs)); +static void p_b_cclass __P((struct parse *p, cset *cs)); +static void p_b_eclass __P((struct parse *p, cset *cs)); +static char p_b_symbol __P((struct parse *p)); +static char p_b_coll_elem __P((struct parse *p, int endc)); +static char othercase __P((int ch)); +static void bothcases __P((struct parse *p, int ch)); +static void ordinary __P((struct parse *p, int ch)); +static void nonnewline __P((struct parse *p)); +static void repeat __P((struct parse *p, sopno start, int from, int to)); +static int seterr __P((struct parse *p, int e)); +static cset *allocset __P((struct parse *p)); +static void freeset __P((struct parse *p, cset *cs)); +static int freezeset __P((struct parse *p, cset *cs)); +static int firstch __P((struct parse *p, cset *cs)); +static int nch __P((struct parse *p, cset *cs)); +static void mcadd __P((struct parse *p, cset *cs, char *cp)); +#if used +static void mcsub __P((cset *cs, char *cp)); +static int mcin __P((cset *cs, char *cp)); +static char *mcfind __P((cset *cs, char *cp)); +#endif +static void mcinvert __P((struct parse *p, cset *cs)); +static void mccase __P((struct parse *p, cset *cs)); +static int isinsets __P((struct re_guts *g, int c)); +static int samesets __P((struct re_guts *g, int c1, int c2)); +static void categorize __P((struct parse *p, struct re_guts *g)); +static sopno dupl __P((struct parse *p, sopno start, sopno finish)); +static void doemit __P((struct parse *p, sop op, size_t opnd)); +static void doinsert __P((struct parse *p, sop op, size_t opnd, sopno pos)); +static void dofwd __P((struct parse *p, sopno pos, sop value)); +static void enlarge __P((struct parse *p, sopno size)); +static void stripsnug __P((struct parse *p, struct re_guts *g)); +static void findmust __P((struct parse *p, struct re_guts *g)); +static int altoffset __P((sop *scan, int offset, int mccs)); +static void computejumps __P((struct parse *p, struct re_guts *g)); +static void computematchjumps __P((struct parse *p, struct re_guts *g)); +static sopno pluscount __P((struct parse *p, struct re_guts *g)); + +#ifdef __cplusplus +} +#endif +/* ========= end header generated by ./mkh ========= */ + +static char nuls[10]; /* place to point scanner in event of error */ + +/* + * macros for use with parse structure + * BEWARE: these know that the parse structure is named `p' !!! + */ +#define PEEK() (*p->next) +#define PEEK2() (*(p->next+1)) +#define MORE() (p->next < p->end) +#define MORE2() (p->next+1 < p->end) +#define SEE(c) (MORE() && PEEK() == (c)) +#define SEETWO(a, b) (MORE() && MORE2() && PEEK() == (a) && PEEK2() == (b)) +#define EAT(c) ((SEE(c)) ? (NEXT(), 1) : 0) +#define EATTWO(a, b) ((SEETWO(a, b)) ? (NEXT2(), 1) : 0) +#define NEXT() (p->next++) +#define NEXT2() (p->next += 2) +#define NEXTn(n) (p->next += (n)) +#define GETNEXT() (*p->next++) +#define SETERROR(e) seterr(p, (e)) +#define REQUIRE(co, e) ((co) || SETERROR(e)) +#define MUSTSEE(c, e) (REQUIRE(MORE() && PEEK() == (c), e)) +#define MUSTEAT(c, e) (REQUIRE(MORE() && GETNEXT() == (c), e)) +#define MUSTNOTSEE(c, e) (REQUIRE(!MORE() || PEEK() != (c), e)) +#define EMIT(op, sopnd) doemit(p, (sop)(op), (size_t)(sopnd)) +#define INSERT(op, pos) doinsert(p, (sop)(op), HERE()-(pos)+1, pos) +#define AHEAD(pos) dofwd(p, pos, HERE()-(pos)) +#define ASTERN(sop, pos) EMIT(sop, HERE()-pos) +#define HERE() (p->slen) +#define THERE() (p->slen - 1) +#define THERETHERE() (p->slen - 2) +#define DROP(n) (p->slen -= (n)) + +#ifndef NDEBUG +static int never = 0; /* for use in asserts; shuts lint up */ +#else +#define never 0 /* some s have bugs too */ +#endif + +/* Macro used by computejump()/computematchjump() */ +#define MIN(a,b) ((a)<(b)?(a):(b)) + +/* + - regcomp - interface for parser and compilation + = extern int regcomp(regex_t *, const char *, int); + = #define REG_BASIC 0000 + = #define REG_EXTENDED 0001 + = #define REG_ICASE 0002 + = #define REG_NOSUB 0004 + = #define REG_NEWLINE 0010 + = #define REG_NOSPEC 0020 + = #define REG_PEND 0040 + = #define REG_DUMP 0200 + */ +int /* 0 success, otherwise REG_something */ +regcomp(preg, pattern, cflags) +regex_t *preg; +const char *pattern; +int cflags; +{ + struct parse pa; + register struct re_guts *g; + register struct parse *p = &pa; + register int i; + register size_t len; +#ifdef REDEBUG +# define GOODFLAGS(f) (f) +#else +# define GOODFLAGS(f) ((f)&~REG_DUMP) +#endif + + cflags = GOODFLAGS(cflags); + if ((cflags®_EXTENDED) && (cflags®_NOSPEC)) + return(REG_INVARG); + + if (cflags®_PEND) { + if (preg->re_endp < pattern) + return(REG_INVARG); + len = preg->re_endp - pattern; + } else + len = strlen((char *)pattern); + + /* do the mallocs early so failure handling is easy */ + g = (struct re_guts *)malloc(sizeof(struct re_guts) + + (NC-1)*sizeof(cat_t)); + if (g == NULL) + return(REG_ESPACE); + p->ssize = len/(size_t)2*(size_t)3 + (size_t)1; /* ugh */ + p->strip = (sop *)malloc(p->ssize * sizeof(sop)); + p->slen = 0; + if (p->strip == NULL) { + free((char *)g); + return(REG_ESPACE); + } + + /* set things up */ + p->g = g; + p->next = (char *)pattern; /* convenience; we do not modify it */ + p->end = p->next + len; + p->error = 0; + p->ncsalloc = 0; + for (i = 0; i < NPAREN; i++) { + p->pbegin[i] = 0; + p->pend[i] = 0; + } + g->csetsize = NC; + g->sets = NULL; + g->setbits = NULL; + g->ncsets = 0; + g->cflags = cflags; + g->iflags = 0; + g->nbol = 0; + g->neol = 0; + g->must = NULL; + g->moffset = -1; + g->charjump = NULL; + g->matchjump = NULL; + g->mlen = 0; + g->nsub = 0; + g->ncategories = 1; /* category 0 is "everything else" */ + g->categories = &g->catspace[-(CHAR_MIN)]; + (void) memset((char *)g->catspace, 0, NC*sizeof(cat_t)); + g->backrefs = 0; + + /* do it */ + EMIT(OEND, 0); + g->firststate = THERE(); + if (cflags®_EXTENDED) + p_ere(p, OUT); + else if (cflags®_NOSPEC) + p_str(p); + else + p_bre(p, OUT, OUT); + EMIT(OEND, 0); + g->laststate = THERE(); + + /* tidy up loose ends and fill things in */ + categorize(p, g); + stripsnug(p, g); + findmust(p, g); + /* only use Boyer-Moore algorithm if the pattern is bigger + * than three characters + */ + if(g->mlen > 3) { + computejumps(p, g); + computematchjumps(p, g); + if(g->matchjump == NULL && g->charjump != NULL) { + free(g->charjump); + g->charjump = NULL; + } + } + g->nplus = pluscount(p, g); + g->magic = MAGIC2; + preg->re_nsub = g->nsub; + preg->re_g = g; + preg->re_magic = MAGIC1; +#ifndef REDEBUG + /* not debugging, so can't rely on the assert() in regexec() */ + if (g->iflags&BAD) + SETERROR(REG_ASSERT); +#endif + + /* win or lose, we're done */ + if (p->error != 0) /* lose */ + regfree(preg); + return(p->error); +} + +/* + - p_ere - ERE parser top level, concatenation and alternation + == static void p_ere(register struct parse *p, int stop); + */ +static void +p_ere(p, stop) +register struct parse *p; +int stop; /* character this ERE should end at */ +{ + register char c; + register sopno prevback; + register sopno prevfwd; + register sopno conc; + register int first = 1; /* is this the first alternative? */ + + for (;;) { + /* do a bunch of concatenated expressions */ + conc = HERE(); + while (MORE() && (c = PEEK()) != '|' && c != stop) + p_ere_exp(p); + (void)REQUIRE(HERE() != conc, REG_EMPTY); /* require nonempty */ + + if (!EAT('|')) + break; /* NOTE BREAK OUT */ + + if (first) { + INSERT(OCH_, conc); /* offset is wrong */ + prevfwd = conc; + prevback = conc; + first = 0; + } + ASTERN(OOR1, prevback); + prevback = THERE(); + AHEAD(prevfwd); /* fix previous offset */ + prevfwd = HERE(); + EMIT(OOR2, 0); /* offset is very wrong */ + } + + if (!first) { /* tail-end fixups */ + AHEAD(prevfwd); + ASTERN(O_CH, prevback); + } + + assert(!MORE() || SEE(stop)); +} + +/* + - p_ere_exp - parse one subERE, an atom possibly followed by a repetition op + == static void p_ere_exp(register struct parse *p); + */ +static void +p_ere_exp(p) +register struct parse *p; +{ + register char c; + register sopno pos; + register int count; + register int count2; + register sopno subno; + int wascaret = 0; + + assert(MORE()); /* caller should have ensured this */ + c = GETNEXT(); + + pos = HERE(); + switch (c) { + case '(': + (void)REQUIRE(MORE(), REG_EPAREN); + p->g->nsub++; + subno = p->g->nsub; + if (subno < NPAREN) + p->pbegin[subno] = HERE(); + EMIT(OLPAREN, subno); + if (!SEE(')')) + p_ere(p, ')'); + if (subno < NPAREN) { + p->pend[subno] = HERE(); + assert(p->pend[subno] != 0); + } + EMIT(ORPAREN, subno); + (void)MUSTEAT(')', REG_EPAREN); + break; +#ifndef POSIX_MISTAKE + case ')': /* happens only if no current unmatched ( */ + /* + * You may ask, why the ifndef? Because I didn't notice + * this until slightly too late for 1003.2, and none of the + * other 1003.2 regular-expression reviewers noticed it at + * all. So an unmatched ) is legal POSIX, at least until + * we can get it fixed. + */ + SETERROR(REG_EPAREN); + break; +#endif + case '^': + EMIT(OBOL, 0); + p->g->iflags |= USEBOL; + p->g->nbol++; + wascaret = 1; + break; + case '$': + EMIT(OEOL, 0); + p->g->iflags |= USEEOL; + p->g->neol++; + break; + case '|': + SETERROR(REG_EMPTY); + break; + case '*': + case '+': + case '?': + SETERROR(REG_BADRPT); + break; + case '.': + if (p->g->cflags®_NEWLINE) + nonnewline(p); + else + EMIT(OANY, 0); + break; + case '[': + p_bracket(p); + break; + case '\\': + (void)REQUIRE(MORE(), REG_EESCAPE); + c = GETNEXT(); + ordinary(p, c); + break; + case '{': /* okay as ordinary except if digit follows */ + (void)REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT); + /* FALLTHROUGH */ + default: + ordinary(p, c); + break; + } + + if (!MORE()) + return; + c = PEEK(); + /* we call { a repetition if followed by a digit */ + if (!( c == '*' || c == '+' || c == '?' || + (c == '{' && MORE2() && isdigit((uch)PEEK2())) )) + return; /* no repetition, we're done */ + NEXT(); + + (void)REQUIRE(!wascaret, REG_BADRPT); + switch (c) { + case '*': /* implemented as +? */ + /* this case does not require the (y|) trick, noKLUDGE */ + INSERT(OPLUS_, pos); + ASTERN(O_PLUS, pos); + INSERT(OQUEST_, pos); + ASTERN(O_QUEST, pos); + break; + case '+': + INSERT(OPLUS_, pos); + ASTERN(O_PLUS, pos); + break; + case '?': + /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */ + INSERT(OCH_, pos); /* offset slightly wrong */ + ASTERN(OOR1, pos); /* this one's right */ + AHEAD(pos); /* fix the OCH_ */ + EMIT(OOR2, 0); /* offset very wrong... */ + AHEAD(THERE()); /* ...so fix it */ + ASTERN(O_CH, THERETHERE()); + break; + case '{': + count = p_count(p); + if (EAT(',')) { + if (isdigit((uch)PEEK())) { + count2 = p_count(p); + (void)REQUIRE(count <= count2, REG_BADBR); + } else /* single number with comma */ + count2 = INFINITY; + } else /* just a single number */ + count2 = count; + repeat(p, pos, count, count2); + if (!EAT('}')) { /* error heuristics */ + while (MORE() && PEEK() != '}') + NEXT(); + (void)REQUIRE(MORE(), REG_EBRACE); + SETERROR(REG_BADBR); + } + break; + } + + if (!MORE()) + return; + c = PEEK(); + if (!( c == '*' || c == '+' || c == '?' || + (c == '{' && MORE2() && isdigit((uch)PEEK2())) ) ) + return; + SETERROR(REG_BADRPT); +} + +/* + - p_str - string (no metacharacters) "parser" + == static void p_str(register struct parse *p); + */ +static void +p_str(p) +register struct parse *p; +{ + (void)REQUIRE(MORE(), REG_EMPTY); + while (MORE()) + ordinary(p, GETNEXT()); +} + +/* + - p_bre - BRE parser top level, anchoring and concatenation + == static void p_bre(register struct parse *p, register int end1, \ + == register int end2); + * Giving end1 as OUT essentially eliminates the end1/end2 check. + * + * This implementation is a bit of a kludge, in that a trailing $ is first + * taken as an ordinary character and then revised to be an anchor. The + * only undesirable side effect is that '$' gets included as a character + * category in such cases. This is fairly harmless; not worth fixing. + * The amount of lookahead needed to avoid this kludge is excessive. + */ +static void +p_bre(p, end1, end2) +register struct parse *p; +register int end1; /* first terminating character */ +register int end2; /* second terminating character */ +{ + register sopno start = HERE(); + register int first = 1; /* first subexpression? */ + register int wasdollar = 0; + + if (EAT('^')) { + EMIT(OBOL, 0); + p->g->iflags |= USEBOL; + p->g->nbol++; + } + while (MORE() && !SEETWO(end1, end2)) { + wasdollar = p_simp_re(p, first); + first = 0; + } + if (wasdollar) { /* oops, that was a trailing anchor */ + DROP(1); + EMIT(OEOL, 0); + p->g->iflags |= USEEOL; + p->g->neol++; + } + + (void)REQUIRE(HERE() != start, REG_EMPTY); /* require nonempty */ +} + +/* + - p_simp_re - parse a simple RE, an atom possibly followed by a repetition + == static int p_simp_re(register struct parse *p, int starordinary); + */ +static int /* was the simple RE an unbackslashed $? */ +p_simp_re(p, starordinary) +register struct parse *p; +int starordinary; /* is a leading * an ordinary character? */ +{ + register int c; + register int count; + register int count2; + register sopno pos; + register int i; + register sopno subno; +# define BACKSL (1<g->cflags®_NEWLINE) + nonnewline(p); + else + EMIT(OANY, 0); + break; + case '[': + p_bracket(p); + break; + case BACKSL|'{': + SETERROR(REG_BADRPT); + break; + case BACKSL|'(': + p->g->nsub++; + subno = p->g->nsub; + if (subno < NPAREN) + p->pbegin[subno] = HERE(); + EMIT(OLPAREN, subno); + /* the MORE here is an error heuristic */ + if (MORE() && !SEETWO('\\', ')')) + p_bre(p, '\\', ')'); + if (subno < NPAREN) { + p->pend[subno] = HERE(); + assert(p->pend[subno] != 0); + } + EMIT(ORPAREN, subno); + (void)REQUIRE(EATTWO('\\', ')'), REG_EPAREN); + break; + case BACKSL|')': /* should not get here -- must be user */ + case BACKSL|'}': + SETERROR(REG_EPAREN); + break; + case BACKSL|'1': + case BACKSL|'2': + case BACKSL|'3': + case BACKSL|'4': + case BACKSL|'5': + case BACKSL|'6': + case BACKSL|'7': + case BACKSL|'8': + case BACKSL|'9': + i = (c&~BACKSL) - '0'; + assert(i < NPAREN); + if (p->pend[i] != 0) { + assert(i <= p->g->nsub); + EMIT(OBACK_, i); + assert(p->pbegin[i] != 0); + assert(OP(p->strip[p->pbegin[i]]) == OLPAREN); + assert(OP(p->strip[p->pend[i]]) == ORPAREN); + (void) dupl(p, p->pbegin[i]+1, p->pend[i]); + EMIT(O_BACK, i); + } else + SETERROR(REG_ESUBREG); + p->g->backrefs = 1; + break; + case '*': + (void)REQUIRE(starordinary, REG_BADRPT); + /* FALLTHROUGH */ + default: + ordinary(p, (char)c); + break; + } + + if (EAT('*')) { /* implemented as +? */ + /* this case does not require the (y|) trick, noKLUDGE */ + INSERT(OPLUS_, pos); + ASTERN(O_PLUS, pos); + INSERT(OQUEST_, pos); + ASTERN(O_QUEST, pos); + } else if (EATTWO('\\', '{')) { + count = p_count(p); + if (EAT(',')) { + if (MORE() && isdigit((uch)PEEK())) { + count2 = p_count(p); + (void)REQUIRE(count <= count2, REG_BADBR); + } else /* single number with comma */ + count2 = INFINITY; + } else /* just a single number */ + count2 = count; + repeat(p, pos, count, count2); + if (!EATTWO('\\', '}')) { /* error heuristics */ + while (MORE() && !SEETWO('\\', '}')) + NEXT(); + (void)REQUIRE(MORE(), REG_EBRACE); + SETERROR(REG_BADBR); + } + } else if (c == '$') /* $ (but not \$) ends it */ + return(1); + + return(0); +} + +/* + - p_count - parse a repetition count + == static int p_count(register struct parse *p); + */ +static int /* the value */ +p_count(p) +register struct parse *p; +{ + register int count = 0; + register int ndigits = 0; + + while (MORE() && isdigit((uch)PEEK()) && count <= DUPMAX) { + count = count*10 + (GETNEXT() - '0'); + ndigits++; + } + + (void)REQUIRE(ndigits > 0 && count <= DUPMAX, REG_BADBR); + return(count); +} + +/* + - p_bracket - parse a bracketed character list + == static void p_bracket(register struct parse *p); + * + * Note a significant property of this code: if the allocset() did SETERROR, + * no set operations are done. + */ +static void +p_bracket(p) +register struct parse *p; +{ + register cset *cs = allocset(p); + register int invert = 0; + + /* Dept of Truly Sickening Special-Case Kludges */ + if (p->next + 5 < p->end && strncmp(p->next, "[:<:]]", 6) == 0) { + EMIT(OBOW, 0); + NEXTn(6); + return; + } + if (p->next + 5 < p->end && strncmp(p->next, "[:>:]]", 6) == 0) { + EMIT(OEOW, 0); + NEXTn(6); + return; + } + + if (EAT('^')) + invert++; /* make note to invert set at end */ + if (EAT(']')) + CHadd(cs, ']'); + else if (EAT('-')) + CHadd(cs, '-'); + while (MORE() && PEEK() != ']' && !SEETWO('-', ']')) + p_b_term(p, cs); + if (EAT('-')) + CHadd(cs, '-'); + (void)MUSTEAT(']', REG_EBRACK); + + if (p->error != 0) /* don't mess things up further */ + return; + + if (p->g->cflags®_ICASE) { + register int i; + register int ci; + + for (i = p->g->csetsize - 1; i >= 0; i--) + if (CHIN(cs, i) && isalpha(i)) { + ci = othercase(i); + if (ci != i) + CHadd(cs, ci); + } + if (cs->multis != NULL) + mccase(p, cs); + } + if (invert) { + register int i; + + for (i = p->g->csetsize - 1; i >= 0; i--) + if (CHIN(cs, i)) + CHsub(cs, i); + else + CHadd(cs, i); + if (p->g->cflags®_NEWLINE) + CHsub(cs, '\n'); + if (cs->multis != NULL) + mcinvert(p, cs); + } + + assert(cs->multis == NULL); /* xxx */ + + if (nch(p, cs) == 1) { /* optimize singleton sets */ + ordinary(p, firstch(p, cs)); + freeset(p, cs); + } else + EMIT(OANYOF, freezeset(p, cs)); +} + +/* + - p_b_term - parse one term of a bracketed character list + == static void p_b_term(register struct parse *p, register cset *cs); + */ +static void +p_b_term(p, cs) +register struct parse *p; +register cset *cs; +{ + register char c; + register char start, finish; + register int i; + + /* classify what we've got */ + switch ((MORE()) ? PEEK() : '\0') { + case '[': + c = (MORE2()) ? PEEK2() : '\0'; + break; + case '-': + SETERROR(REG_ERANGE); + return; /* NOTE RETURN */ + break; + default: + c = '\0'; + break; + } + + switch (c) { + case ':': /* character class */ + NEXT2(); + (void)REQUIRE(MORE(), REG_EBRACK); + c = PEEK(); + (void)REQUIRE(c != '-' && c != ']', REG_ECTYPE); + p_b_cclass(p, cs); + (void)REQUIRE(MORE(), REG_EBRACK); + (void)REQUIRE(EATTWO(':', ']'), REG_ECTYPE); + break; + case '=': /* equivalence class */ + NEXT2(); + (void)REQUIRE(MORE(), REG_EBRACK); + c = PEEK(); + (void)REQUIRE(c != '-' && c != ']', REG_ECOLLATE); + p_b_eclass(p, cs); + (void)REQUIRE(MORE(), REG_EBRACK); + (void)REQUIRE(EATTWO('=', ']'), REG_ECOLLATE); + break; + default: /* symbol, ordinary character, or range */ +/* xxx revision needed for multichar stuff */ + start = p_b_symbol(p); + if (SEE('-') && MORE2() && PEEK2() != ']') { + /* range */ + NEXT(); + if (EAT('-')) + finish = '-'; + else + finish = p_b_symbol(p); + } else + finish = start; + if (start == finish) + CHadd(cs, start); + else { + if (__collate_load_error) { + (void)REQUIRE((uch)start <= (uch)finish, REG_ERANGE); + for (i = (uch)start; i <= (uch)finish; i++) + CHadd(cs, i); + } else { + (void)REQUIRE(__collate_range_cmp(start, finish) <= 0, REG_ERANGE); + for (i = CHAR_MIN; i <= CHAR_MAX; i++) { + if ( __collate_range_cmp(start, i) <= 0 + && __collate_range_cmp(i, finish) <= 0 + ) + CHadd(cs, i); + } + } + } + break; + } +} + +/* + - p_b_cclass - parse a character-class name and deal with it + == static void p_b_cclass(register struct parse *p, register cset *cs); + */ +static void +p_b_cclass(p, cs) +register struct parse *p; +register cset *cs; +{ + register int c; + register char *sp = p->next; + register struct cclass *cp; + register size_t len; + + while (MORE() && isalpha((uch)PEEK())) + NEXT(); + len = p->next - sp; + for (cp = cclasses; cp->name != NULL; cp++) + if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0') + break; + if (cp->name == NULL) { + /* oops, didn't find it */ + SETERROR(REG_ECTYPE); + return; + } + + switch (cp->fidx) { + case CALNUM: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isalnum((uch)c)) + CHadd(cs, c); + break; + case CALPHA: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isalpha((uch)c)) + CHadd(cs, c); + break; + case CBLANK: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isblank((uch)c)) + CHadd(cs, c); + break; + case CCNTRL: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (iscntrl((uch)c)) + CHadd(cs, c); + break; + case CDIGIT: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isdigit((uch)c)) + CHadd(cs, c); + break; + case CGRAPH: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isgraph((uch)c)) + CHadd(cs, c); + break; + case CLOWER: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (islower((uch)c)) + CHadd(cs, c); + break; + case CPRINT: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isprint((uch)c)) + CHadd(cs, c); + break; + case CPUNCT: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (ispunct((uch)c)) + CHadd(cs, c); + break; + case CSPACE: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isspace((uch)c)) + CHadd(cs, c); + break; + case CUPPER: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isupper((uch)c)) + CHadd(cs, c); + break; + case CXDIGIT: + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (isxdigit((uch)c)) + CHadd(cs, c); + break; + } +#if 0 + for (u = cp->multis; *u != '\0'; u += strlen(u) + 1) + MCadd(p, cs, u); +#endif +} + +/* + - p_b_eclass - parse an equivalence-class name and deal with it + == static void p_b_eclass(register struct parse *p, register cset *cs); + * + * This implementation is incomplete. xxx + */ +static void +p_b_eclass(p, cs) +register struct parse *p; +register cset *cs; +{ + register char c; + + c = p_b_coll_elem(p, '='); + CHadd(cs, c); +} + +/* + - p_b_symbol - parse a character or [..]ed multicharacter collating symbol + == static char p_b_symbol(register struct parse *p); + */ +static char /* value of symbol */ +p_b_symbol(p) +register struct parse *p; +{ + register char value; + + (void)REQUIRE(MORE(), REG_EBRACK); + if (!EATTWO('[', '.')) + return(GETNEXT()); + + /* collating symbol */ + value = p_b_coll_elem(p, '.'); + (void)REQUIRE(EATTWO('.', ']'), REG_ECOLLATE); + return(value); +} + +/* + - p_b_coll_elem - parse a collating-element name and look it up + == static char p_b_coll_elem(register struct parse *p, int endc); + */ +static char /* value of collating element */ +p_b_coll_elem(p, endc) +register struct parse *p; +int endc; /* name ended by endc,']' */ +{ + register char *sp = p->next; + register struct cname *cp; + register int len; + + while (MORE() && !SEETWO(endc, ']')) + NEXT(); + if (!MORE()) { + SETERROR(REG_EBRACK); + return(0); + } + len = p->next - sp; + for (cp = cnames; cp->name != NULL; cp++) + if (strncmp(cp->name, sp, len) == 0 && cp->name[len] == '\0') + return(cp->code); /* known name */ + if (len == 1) + return(*sp); /* single character */ + SETERROR(REG_ECOLLATE); /* neither */ + return(0); +} + +/* + - othercase - return the case counterpart of an alphabetic + == static char othercase(int ch); + */ +static char /* if no counterpart, return ch */ +othercase(ch) +int ch; +{ + ch = (uch)ch; + assert(isalpha(ch)); + if (isupper(ch)) + return(tolower(ch)); + else if (islower(ch)) + return(toupper(ch)); + else /* peculiar, but could happen */ + return(ch); +} + +/* + - bothcases - emit a dualcase version of a two-case character + == static void bothcases(register struct parse *p, int ch); + * + * Boy, is this implementation ever a kludge... + */ +static void +bothcases(p, ch) +register struct parse *p; +int ch; +{ + register char *oldnext = p->next; + register char *oldend = p->end; + char bracket[3]; + + ch = (uch)ch; + assert(othercase(ch) != ch); /* p_bracket() would recurse */ + p->next = bracket; + p->end = bracket+2; + bracket[0] = ch; + bracket[1] = ']'; + bracket[2] = '\0'; + p_bracket(p); + assert(p->next == bracket+2); + p->next = oldnext; + p->end = oldend; +} + +/* + - ordinary - emit an ordinary character + == static void ordinary(register struct parse *p, register int ch); + */ +static void +ordinary(p, ch) +register struct parse *p; +register int ch; +{ + register cat_t *cap = p->g->categories; + + if ((p->g->cflags®_ICASE) && isalpha((uch)ch) && othercase(ch) != ch) + bothcases(p, ch); + else { + EMIT(OCHAR, (uch)ch); + if (cap[ch] == 0) + cap[ch] = p->g->ncategories++; + } +} + +/* + - nonnewline - emit REG_NEWLINE version of OANY + == static void nonnewline(register struct parse *p); + * + * Boy, is this implementation ever a kludge... + */ +static void +nonnewline(p) +register struct parse *p; +{ + register char *oldnext = p->next; + register char *oldend = p->end; + char bracket[4]; + + p->next = bracket; + p->end = bracket+3; + bracket[0] = '^'; + bracket[1] = '\n'; + bracket[2] = ']'; + bracket[3] = '\0'; + p_bracket(p); + assert(p->next == bracket+3); + p->next = oldnext; + p->end = oldend; +} + +/* + - repeat - generate code for a bounded repetition, recursively if needed + == static void repeat(register struct parse *p, sopno start, int from, int to); + */ +static void +repeat(p, start, from, to) +register struct parse *p; +sopno start; /* operand from here to end of strip */ +int from; /* repeated from this number */ +int to; /* to this number of times (maybe INFINITY) */ +{ + register sopno finish = HERE(); +# define N 2 +# define INF 3 +# define REP(f, t) ((f)*8 + (t)) +# define MAP(n) (((n) <= 1) ? (n) : ((n) == INFINITY) ? INF : N) + register sopno copy; + + if (p->error != 0) /* head off possible runaway recursion */ + return; + + assert(from <= to); + + switch (REP(MAP(from), MAP(to))) { + case REP(0, 0): /* must be user doing this */ + DROP(finish-start); /* drop the operand */ + break; + case REP(0, 1): /* as x{1,1}? */ + case REP(0, N): /* as x{1,n}? */ + case REP(0, INF): /* as x{1,}? */ + /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */ + INSERT(OCH_, start); /* offset is wrong... */ + repeat(p, start+1, 1, to); + ASTERN(OOR1, start); + AHEAD(start); /* ... fix it */ + EMIT(OOR2, 0); + AHEAD(THERE()); + ASTERN(O_CH, THERETHERE()); + break; + case REP(1, 1): /* trivial case */ + /* done */ + break; + case REP(1, N): /* as x?x{1,n-1} */ + /* KLUDGE: emit y? as (y|) until subtle bug gets fixed */ + INSERT(OCH_, start); + ASTERN(OOR1, start); + AHEAD(start); + EMIT(OOR2, 0); /* offset very wrong... */ + AHEAD(THERE()); /* ...so fix it */ + ASTERN(O_CH, THERETHERE()); + copy = dupl(p, start+1, finish+1); + assert(copy == finish+4); + repeat(p, copy, 1, to-1); + break; + case REP(1, INF): /* as x+ */ + INSERT(OPLUS_, start); + ASTERN(O_PLUS, start); + break; + case REP(N, N): /* as xx{m-1,n-1} */ + copy = dupl(p, start, finish); + repeat(p, copy, from-1, to-1); + break; + case REP(N, INF): /* as xx{n-1,INF} */ + copy = dupl(p, start, finish); + repeat(p, copy, from-1, to); + break; + default: /* "can't happen" */ + SETERROR(REG_ASSERT); /* just in case */ + break; + } +} + +/* + - seterr - set an error condition + == static int seterr(register struct parse *p, int e); + */ +static int /* useless but makes type checking happy */ +seterr(p, e) +register struct parse *p; +int e; +{ + if (p->error == 0) /* keep earliest error condition */ + p->error = e; + p->next = nuls; /* try to bring things to a halt */ + p->end = nuls; + return(0); /* make the return value well-defined */ +} + +/* + - allocset - allocate a set of characters for [] + == static cset *allocset(register struct parse *p); + */ +static cset * +allocset(p) +register struct parse *p; +{ + register int no = p->g->ncsets++; + register size_t nc; + register size_t nbytes; + register cset *cs; + register size_t css = (size_t)p->g->csetsize; + register int i; + + if (no >= p->ncsalloc) { /* need another column of space */ + p->ncsalloc += CHAR_BIT; + nc = p->ncsalloc; + assert(nc % CHAR_BIT == 0); + nbytes = nc / CHAR_BIT * css; + if (p->g->sets == NULL) + p->g->sets = (cset *)malloc(nc * sizeof(cset)); + else + p->g->sets = (cset *)reallocf((char *)p->g->sets, + nc * sizeof(cset)); + if (p->g->setbits == NULL) + p->g->setbits = (uch *)malloc(nbytes); + else { + p->g->setbits = (uch *)reallocf((char *)p->g->setbits, + nbytes); + /* xxx this isn't right if setbits is now NULL */ + for (i = 0; i < no; i++) + p->g->sets[i].ptr = p->g->setbits + css*(i/CHAR_BIT); + } + if (p->g->sets != NULL && p->g->setbits != NULL) + (void) memset((char *)p->g->setbits + (nbytes - css), + 0, css); + else { + no = 0; + SETERROR(REG_ESPACE); + /* caller's responsibility not to do set ops */ + } + } + + assert(p->g->sets != NULL); /* xxx */ + cs = &p->g->sets[no]; + cs->ptr = p->g->setbits + css*((no)/CHAR_BIT); + cs->mask = 1 << ((no) % CHAR_BIT); + cs->hash = 0; + cs->smultis = 0; + cs->multis = NULL; + + return(cs); +} + +/* + - freeset - free a now-unused set + == static void freeset(register struct parse *p, register cset *cs); + */ +static void +freeset(p, cs) +register struct parse *p; +register cset *cs; +{ + register int i; + register cset *top = &p->g->sets[p->g->ncsets]; + register size_t css = (size_t)p->g->csetsize; + + for (i = 0; i < css; i++) + CHsub(cs, i); + if (cs == top-1) /* recover only the easy case */ + p->g->ncsets--; +} + +/* + - freezeset - final processing on a set of characters + == static int freezeset(register struct parse *p, register cset *cs); + * + * The main task here is merging identical sets. This is usually a waste + * of time (although the hash code minimizes the overhead), but can win + * big if REG_ICASE is being used. REG_ICASE, by the way, is why the hash + * is done using addition rather than xor -- all ASCII [aA] sets xor to + * the same value! + */ +static int /* set number */ +freezeset(p, cs) +register struct parse *p; +register cset *cs; +{ + register short h = cs->hash; + register int i; + register cset *top = &p->g->sets[p->g->ncsets]; + register cset *cs2; + register size_t css = (size_t)p->g->csetsize; + + /* look for an earlier one which is the same */ + for (cs2 = &p->g->sets[0]; cs2 < top; cs2++) + if (cs2->hash == h && cs2 != cs) { + /* maybe */ + for (i = 0; i < css; i++) + if (!!CHIN(cs2, i) != !!CHIN(cs, i)) + break; /* no */ + if (i == css) + break; /* yes */ + } + + if (cs2 < top) { /* found one */ + freeset(p, cs); + cs = cs2; + } + + return((int)(cs - p->g->sets)); +} + +/* + - firstch - return first character in a set (which must have at least one) + == static int firstch(register struct parse *p, register cset *cs); + */ +static int /* character; there is no "none" value */ +firstch(p, cs) +register struct parse *p; +register cset *cs; +{ + register int i; + register size_t css = (size_t)p->g->csetsize; + + for (i = 0; i < css; i++) + if (CHIN(cs, i)) + return((char)i); + assert(never); + return(0); /* arbitrary */ +} + +/* + - nch - number of characters in a set + == static int nch(register struct parse *p, register cset *cs); + */ +static int +nch(p, cs) +register struct parse *p; +register cset *cs; +{ + register int i; + register size_t css = (size_t)p->g->csetsize; + register int n = 0; + + for (i = 0; i < css; i++) + if (CHIN(cs, i)) + n++; + return(n); +} + +/* + - mcadd - add a collating element to a cset + == static void mcadd(register struct parse *p, register cset *cs, \ + == register char *cp); + */ +static void +mcadd(p, cs, cp) +register struct parse *p; +register cset *cs; +register char *cp; +{ + register size_t oldend = cs->smultis; + + cs->smultis += strlen(cp) + 1; + if (cs->multis == NULL) + cs->multis = malloc(cs->smultis); + else + cs->multis = reallocf(cs->multis, cs->smultis); + if (cs->multis == NULL) { + SETERROR(REG_ESPACE); + return; + } + + (void) strcpy(cs->multis + oldend - 1, cp); + cs->multis[cs->smultis - 1] = '\0'; +} + +#if used +/* + - mcsub - subtract a collating element from a cset + == static void mcsub(register cset *cs, register char *cp); + */ +static void +mcsub(cs, cp) +register cset *cs; +register char *cp; +{ + register char *fp = mcfind(cs, cp); + register size_t len = strlen(fp); + + assert(fp != NULL); + (void) memmove(fp, fp + len + 1, + cs->smultis - (fp + len + 1 - cs->multis)); + cs->smultis -= len; + + if (cs->smultis == 0) { + free(cs->multis); + cs->multis = NULL; + return; + } + + cs->multis = reallocf(cs->multis, cs->smultis); + assert(cs->multis != NULL); +} + +/* + - mcin - is a collating element in a cset? + == static int mcin(register cset *cs, register char *cp); + */ +static int +mcin(cs, cp) +register cset *cs; +register char *cp; +{ + return(mcfind(cs, cp) != NULL); +} + +/* + - mcfind - find a collating element in a cset + == static char *mcfind(register cset *cs, register char *cp); + */ +static char * +mcfind(cs, cp) +register cset *cs; +register char *cp; +{ + register char *p; + + if (cs->multis == NULL) + return(NULL); + for (p = cs->multis; *p != '\0'; p += strlen(p) + 1) + if (strcmp(cp, p) == 0) + return(p); + return(NULL); +} +#endif + +/* + - mcinvert - invert the list of collating elements in a cset + == static void mcinvert(register struct parse *p, register cset *cs); + * + * This would have to know the set of possibilities. Implementation + * is deferred. + */ +static void +mcinvert(p, cs) +register struct parse *p; +register cset *cs; +{ + assert(cs->multis == NULL); /* xxx */ +} + +/* + - mccase - add case counterparts of the list of collating elements in a cset + == static void mccase(register struct parse *p, register cset *cs); + * + * This would have to know the set of possibilities. Implementation + * is deferred. + */ +static void +mccase(p, cs) +register struct parse *p; +register cset *cs; +{ + assert(cs->multis == NULL); /* xxx */ +} + +/* + - isinsets - is this character in any sets? + == static int isinsets(register struct re_guts *g, int c); + */ +static int /* predicate */ +isinsets(g, c) +register struct re_guts *g; +int c; +{ + register uch *col; + register int i; + register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT; + register unsigned uc = (uch)c; + + for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize) + if (col[uc] != 0) + return(1); + return(0); +} + +/* + - samesets - are these two characters in exactly the same sets? + == static int samesets(register struct re_guts *g, int c1, int c2); + */ +static int /* predicate */ +samesets(g, c1, c2) +register struct re_guts *g; +int c1; +int c2; +{ + register uch *col; + register int i; + register int ncols = (g->ncsets+(CHAR_BIT-1)) / CHAR_BIT; + register unsigned uc1 = (uch)c1; + register unsigned uc2 = (uch)c2; + + for (i = 0, col = g->setbits; i < ncols; i++, col += g->csetsize) + if (col[uc1] != col[uc2]) + return(0); + return(1); +} + +/* + - categorize - sort out character categories + == static void categorize(struct parse *p, register struct re_guts *g); + */ +static void +categorize(p, g) +struct parse *p; +register struct re_guts *g; +{ + register cat_t *cats = g->categories; + register int c; + register int c2; + register cat_t cat; + + /* avoid making error situations worse */ + if (p->error != 0) + return; + + for (c = CHAR_MIN; c <= CHAR_MAX; c++) + if (cats[c] == 0 && isinsets(g, c)) { + cat = g->ncategories++; + cats[c] = cat; + for (c2 = c+1; c2 <= CHAR_MAX; c2++) + if (cats[c2] == 0 && samesets(g, c, c2)) + cats[c2] = cat; + } +} + +/* + - dupl - emit a duplicate of a bunch of sops + == static sopno dupl(register struct parse *p, sopno start, sopno finish); + */ +static sopno /* start of duplicate */ +dupl(p, start, finish) +register struct parse *p; +sopno start; /* from here */ +sopno finish; /* to this less one */ +{ + register sopno ret = HERE(); + register sopno len = finish - start; + + assert(finish >= start); + if (len == 0) + return(ret); + enlarge(p, p->ssize + len); /* this many unexpected additions */ + assert(p->ssize >= p->slen + len); + (void) memcpy((char *)(p->strip + p->slen), + (char *)(p->strip + start), (size_t)len*sizeof(sop)); + p->slen += len; + return(ret); +} + +/* + - doemit - emit a strip operator + == static void doemit(register struct parse *p, sop op, size_t opnd); + * + * It might seem better to implement this as a macro with a function as + * hard-case backup, but it's just too big and messy unless there are + * some changes to the data structures. Maybe later. + */ +static void +doemit(p, op, opnd) +register struct parse *p; +sop op; +size_t opnd; +{ + /* avoid making error situations worse */ + if (p->error != 0) + return; + + /* deal with oversize operands ("can't happen", more or less) */ + assert(opnd < 1<slen >= p->ssize) + enlarge(p, (p->ssize+1) / 2 * 3); /* +50% */ + assert(p->slen < p->ssize); + + /* finally, it's all reduced to the easy case */ + p->strip[p->slen++] = SOP(op, opnd); +} + +/* + - doinsert - insert a sop into the strip + == static void doinsert(register struct parse *p, sop op, size_t opnd, sopno pos); + */ +static void +doinsert(p, op, opnd, pos) +register struct parse *p; +sop op; +size_t opnd; +sopno pos; +{ + register sopno sn; + register sop s; + register int i; + + /* avoid making error situations worse */ + if (p->error != 0) + return; + + sn = HERE(); + EMIT(op, opnd); /* do checks, ensure space */ + assert(HERE() == sn+1); + s = p->strip[sn]; + + /* adjust paren pointers */ + assert(pos > 0); + for (i = 1; i < NPAREN; i++) { + if (p->pbegin[i] >= pos) { + p->pbegin[i]++; + } + if (p->pend[i] >= pos) { + p->pend[i]++; + } + } + + memmove((char *)&p->strip[pos+1], (char *)&p->strip[pos], + (HERE()-pos-1)*sizeof(sop)); + p->strip[pos] = s; +} + +/* + - dofwd - complete a forward reference + == static void dofwd(register struct parse *p, sopno pos, sop value); + */ +static void +dofwd(p, pos, value) +register struct parse *p; +register sopno pos; +sop value; +{ + /* avoid making error situations worse */ + if (p->error != 0) + return; + + assert(value < 1<strip[pos] = OP(p->strip[pos]) | value; +} + +/* + - enlarge - enlarge the strip + == static void enlarge(register struct parse *p, sopno size); + */ +static void +enlarge(p, size) +register struct parse *p; +register sopno size; +{ + register sop *sp; + + if (p->ssize >= size) + return; + + sp = (sop *)realloc(p->strip, size*sizeof(sop)); + if (sp == NULL) { + SETERROR(REG_ESPACE); + return; + } + p->strip = sp; + p->ssize = size; +} + +/* + - stripsnug - compact the strip + == static void stripsnug(register struct parse *p, register struct re_guts *g); + */ +static void +stripsnug(p, g) +register struct parse *p; +register struct re_guts *g; +{ + g->nstates = p->slen; + g->strip = (sop *)realloc((char *)p->strip, p->slen * sizeof(sop)); + if (g->strip == NULL) { + SETERROR(REG_ESPACE); + g->strip = p->strip; + } +} + +/* + - findmust - fill in must and mlen with longest mandatory literal string + == static void findmust(register struct parse *p, register struct re_guts *g); + * + * This algorithm could do fancy things like analyzing the operands of | + * for common subsequences. Someday. This code is simple and finds most + * of the interesting cases. + * + * Note that must and mlen got initialized during setup. + */ +static void +findmust(p, g) +struct parse *p; +register struct re_guts *g; +{ + register sop *scan; + sop *start; + register sop *newstart; + register sopno newlen; + register sop s; + register char *cp; + register sopno i; + int offset; + int cs, mccs; + + /* avoid making error situations worse */ + if (p->error != 0) + return; + + /* Find out if we can handle OANYOF or not */ + mccs = 0; + for (cs = 0; cs < g->ncsets; cs++) + if (g->sets[cs].multis != NULL) + mccs = 1; + + /* find the longest OCHAR sequence in strip */ + newlen = 0; + offset = 0; + g->moffset = 0; + scan = g->strip + 1; + do { + s = *scan++; + switch (OP(s)) { + case OCHAR: /* sequence member */ + if (newlen == 0) /* new sequence */ + newstart = scan - 1; + newlen++; + break; + case OPLUS_: /* things that don't break one */ + case OLPAREN: + case ORPAREN: + break; + case OQUEST_: /* things that must be skipped */ + case OCH_: + offset = altoffset(scan, offset, mccs); + scan--; + do { + scan += OPND(s); + s = *scan; + /* assert() interferes w debug printouts */ + if (OP(s) != O_QUEST && OP(s) != O_CH && + OP(s) != OOR2) { + g->iflags |= BAD; + return; + } + } while (OP(s) != O_QUEST && OP(s) != O_CH); + /* fallthrough */ + case OBOW: /* things that break a sequence */ + case OEOW: + case OBOL: + case OEOL: + case O_QUEST: + case O_CH: + case OEND: + if (newlen > g->mlen) { /* ends one */ + start = newstart; + g->mlen = newlen; + if (offset > -1) { + g->moffset += offset; + offset = newlen; + } else + g->moffset = offset; + } else { + if (offset > -1) + offset += newlen; + } + newlen = 0; + break; + case OANY: + if (newlen > g->mlen) { /* ends one */ + start = newstart; + g->mlen = newlen; + if (offset > -1) { + g->moffset += offset; + offset = newlen; + } else + g->moffset = offset; + } else { + if (offset > -1) + offset += newlen; + } + if (offset > -1) + offset++; + newlen = 0; + break; + case OANYOF: /* may or may not invalidate offset */ + /* First, everything as OANY */ + if (newlen > g->mlen) { /* ends one */ + start = newstart; + g->mlen = newlen; + if (offset > -1) { + g->moffset += offset; + offset = newlen; + } else + g->moffset = offset; + } else { + if (offset > -1) + offset += newlen; + } + if (offset > -1) + offset++; + newlen = 0; + /* And, now, if we found out we can't deal with + * it, make offset = -1. + */ + if (mccs) + offset = -1; + break; + default: + /* Anything here makes it impossible or too hard + * to calculate the offset -- so we give up; + * save the last known good offset, in case the + * must sequence doesn't occur later. + */ + if (newlen > g->mlen) { /* ends one */ + start = newstart; + g->mlen = newlen; + if (offset > -1) + g->moffset += offset; + else + g->moffset = offset; + } + offset = -1; + newlen = 0; + break; + } + } while (OP(s) != OEND); + + if (g->mlen == 0) { /* there isn't one */ + g->moffset = -1; + return; + } + + /* turn it into a character string */ + g->must = malloc((size_t)g->mlen + 1); + if (g->must == NULL) { /* argh; just forget it */ + g->mlen = 0; + g->moffset = -1; + return; + } + cp = g->must; + scan = start; + for (i = g->mlen; i > 0; i--) { + while (OP(s = *scan++) != OCHAR) + continue; + assert(cp < g->must + g->mlen); + *cp++ = (char)OPND(s); + } + assert(cp == g->must + g->mlen); + *cp++ = '\0'; /* just on general principles */ +} + +/* + - altoffset - choose biggest offset among multiple choices + == static int altoffset(sop *scan, int offset, int mccs); + * + * Compute, recursively if necessary, the largest offset among multiple + * re paths. + */ +static int +altoffset(scan, offset, mccs) +sop *scan; +int offset; +int mccs; +{ + int largest; + int try; + sop s; + + /* If we gave up already on offsets, return */ + if (offset == -1) + return -1; + + largest = 0; + try = 0; + s = *scan++; + while (OP(s) != O_QUEST && OP(s) != O_CH) { + switch (OP(s)) { + case OOR1: + if (try > largest) + largest = try; + try = 0; + break; + case OQUEST_: + case OCH_: + try = altoffset(scan, try, mccs); + if (try == -1) + return -1; + scan--; + do { + scan += OPND(s); + s = *scan; + if (OP(s) != O_QUEST && OP(s) != O_CH && + OP(s) != OOR2) + return -1; + } while (OP(s) != O_QUEST && OP(s) != O_CH); + /* We must skip to the next position, or we'll + * leave altoffset() too early. + */ + scan++; + break; + case OANYOF: + if (mccs) + return -1; + case OCHAR: + case OANY: + try++; + case OBOW: + case OEOW: + case OLPAREN: + case ORPAREN: + case OOR2: + break; + default: + try = -1; + break; + } + if (try == -1) + return -1; + s = *scan++; + } + + if (try > largest) + largest = try; + + return largest+offset; +} + +/* + - computejumps - compute char jumps for BM scan + == static void computejumps(register struct parse *p, register struct re_guts *g); + * + * This algorithm assumes g->must exists and is has size greater than + * zero. It's based on the algorithm found on Computer Algorithms by + * Sara Baase. + * + * A char jump is the number of characters one needs to jump based on + * the value of the character from the text that was mismatched. + */ +static void +computejumps(p, g) +struct parse *p; +struct re_guts *g; +{ + int ch; + int mindex; + + /* Avoid making errors worse */ + if (p->error != 0) + return; + + g->charjump = (int*) malloc((NC + 1) * sizeof(int)); + if (g->charjump == NULL) /* Not a fatal error */ + return; + /* Adjust for signed chars, if necessary */ + g->charjump = &g->charjump[-(CHAR_MIN)]; + + /* If the character does not exist in the pattern, the jump + * is equal to the number of characters in the pattern. + */ + for (ch = CHAR_MIN; ch < (CHAR_MAX + 1); ch++) + g->charjump[ch] = g->mlen; + + /* If the character does exist, compute the jump that would + * take us to the last character in the pattern equal to it + * (notice that we match right to left, so that last character + * is the first one that would be matched). + */ + for (mindex = 0; mindex < g->mlen; mindex++) + g->charjump[g->must[mindex]] = g->mlen - mindex - 1; +} + +/* + - computematchjumps - compute match jumps for BM scan + == static void computematchjumps(register struct parse *p, register struct re_guts *g); + * + * This algorithm assumes g->must exists and is has size greater than + * zero. It's based on the algorithm found on Computer Algorithms by + * Sara Baase. + * + * A match jump is the number of characters one needs to advance based + * on the already-matched suffix. + * Notice that all values here are minus (g->mlen-1), because of the way + * the search algorithm works. + */ +static void +computematchjumps(p, g) +struct parse *p; +struct re_guts *g; +{ + int mindex; /* General "must" iterator */ + int suffix; /* Keeps track of matching suffix */ + int ssuffix; /* Keeps track of suffixes' suffix */ + int* pmatches; /* pmatches[k] points to the next i + * such that i+1...mlen is a substring + * of k+1...k+mlen-i-1 + */ + + /* Avoid making errors worse */ + if (p->error != 0) + return; + + pmatches = (int*) malloc(g->mlen * sizeof(unsigned int)); + if (pmatches == NULL) { + g->matchjump = NULL; + return; + } + + g->matchjump = (int*) malloc(g->mlen * sizeof(unsigned int)); + if (g->matchjump == NULL) /* Not a fatal error */ + return; + + /* Set maximum possible jump for each character in the pattern */ + for (mindex = 0; mindex < g->mlen; mindex++) + g->matchjump[mindex] = 2*g->mlen - mindex - 1; + + /* Compute pmatches[] */ + for (mindex = g->mlen - 1, suffix = g->mlen; mindex >= 0; + mindex--, suffix--) { + pmatches[mindex] = suffix; + + /* If a mismatch is found, interrupting the substring, + * compute the matchjump for that position. If no + * mismatch is found, then a text substring mismatched + * against the suffix will also mismatch against the + * substring. + */ + while (suffix < g->mlen + && g->must[mindex] != g->must[suffix]) { + g->matchjump[suffix] = MIN(g->matchjump[suffix], + g->mlen - mindex - 1); + suffix = pmatches[suffix]; + } + } + + /* Compute the matchjump up to the last substring found to jump + * to the beginning of the largest must pattern prefix matching + * it's own suffix. + */ + for (mindex = 0; mindex <= suffix; mindex++) + g->matchjump[mindex] = MIN(g->matchjump[mindex], + g->mlen + suffix - mindex); + + ssuffix = pmatches[suffix]; + while (suffix < g->mlen) { + while (suffix <= ssuffix && suffix < g->mlen) { + g->matchjump[suffix] = MIN(g->matchjump[suffix], + g->mlen + ssuffix - suffix); + suffix++; + } + ssuffix = pmatches[ssuffix]; + } + + free(pmatches); +} + +/* + - pluscount - count + nesting + == static sopno pluscount(register struct parse *p, register struct re_guts *g); + */ +static sopno /* nesting depth */ +pluscount(p, g) +struct parse *p; +register struct re_guts *g; +{ + register sop *scan; + register sop s; + register sopno plusnest = 0; + register sopno maxnest = 0; + + if (p->error != 0) + return(0); /* there may not be an OEND */ + + scan = g->strip + 1; + do { + s = *scan++; + switch (OP(s)) { + case OPLUS_: + plusnest++; + break; + case O_PLUS: + if (plusnest > maxnest) + maxnest = plusnest; + plusnest--; + break; + } + } while (OP(s) != OEND); + if (plusnest != 0) + g->iflags |= BAD; + return(maxnest); +} diff --git a/cbits/regex/regerror.c b/cbits/regex/regerror.c new file mode 100644 index 0000000..b1d151d --- /dev/null +++ b/cbits/regex/regerror.c @@ -0,0 +1,177 @@ +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 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. + * + * @(#)regerror.c 8.4 (Berkeley) 3/20/94 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regerror.c 8.4 (Berkeley) 3/20/94"; +#endif /* LIBC_SCCS and not lint */ + +#include +#include +#include +#include +#include +#include + +#include "utils.h" + +/* ========= begin header generated by ./mkh ========= */ +#ifdef __cplusplus +extern "C" { +#endif + +/* === regerror.c === */ +static char *regatoi __P((const regex_t *preg, char *localbuf)); + +#ifdef __cplusplus +} +#endif +/* ========= end header generated by ./mkh ========= */ +/* + = #define REG_NOMATCH 1 + = #define REG_BADPAT 2 + = #define REG_ECOLLATE 3 + = #define REG_ECTYPE 4 + = #define REG_EESCAPE 5 + = #define REG_ESUBREG 6 + = #define REG_EBRACK 7 + = #define REG_EPAREN 8 + = #define REG_EBRACE 9 + = #define REG_BADBR 10 + = #define REG_ERANGE 11 + = #define REG_ESPACE 12 + = #define REG_BADRPT 13 + = #define REG_EMPTY 14 + = #define REG_ASSERT 15 + = #define REG_INVARG 16 + = #define REG_ATOI 255 // convert name to number (!) + = #define REG_ITOA 0400 // convert number to name (!) + */ +static struct rerr { + int code; + char *name; + char *explain; +} rerrs[] = { + {REG_NOMATCH, "REG_NOMATCH", "regexec() failed to match"}, + {REG_BADPAT, "REG_BADPAT", "invalid regular expression"}, + {REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element"}, + {REG_ECTYPE, "REG_ECTYPE", "invalid character class"}, + {REG_EESCAPE, "REG_EESCAPE", "trailing backslash (\\)"}, + {REG_ESUBREG, "REG_ESUBREG", "invalid backreference number"}, + {REG_EBRACK, "REG_EBRACK", "brackets ([ ]) not balanced"}, + {REG_EPAREN, "REG_EPAREN", "parentheses not balanced"}, + {REG_EBRACE, "REG_EBRACE", "braces not balanced"}, + {REG_BADBR, "REG_BADBR", "invalid repetition count(s)"}, + {REG_ERANGE, "REG_ERANGE", "invalid character range"}, + {REG_ESPACE, "REG_ESPACE", "out of memory"}, + {REG_BADRPT, "REG_BADRPT", "repetition-operator operand invalid"}, + {REG_EMPTY, "REG_EMPTY", "empty (sub)expression"}, + {REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug"}, + {REG_INVARG, "REG_INVARG", "invalid argument to regex routine"}, + {0, "", "*** unknown regexp error code ***"} +}; + +/* + - regerror - the interface to error numbers + = extern size_t regerror(int, const regex_t *, char *, size_t); + */ +/* ARGSUSED */ +size_t +regerror(errcode, preg, errbuf, errbuf_size) +int errcode; +const regex_t *preg; +char *errbuf; +size_t errbuf_size; +{ + register struct rerr *r; + register size_t len; + register int target = errcode &~ REG_ITOA; + register char *s; + char convbuf[50]; + + if (errcode == REG_ATOI) + s = regatoi(preg, convbuf); + else { + for (r = rerrs; r->code != 0; r++) + if (r->code == target) + break; + + if (errcode®_ITOA) { + if (r->code != 0) + (void) strcpy(convbuf, r->name); + else + sprintf(convbuf, "REG_0x%x", target); + assert(strlen(convbuf) < sizeof(convbuf)); + s = convbuf; + } else + s = r->explain; + } + + len = strlen(s) + 1; + if (errbuf_size > 0) { + if (errbuf_size > len) + (void) strcpy(errbuf, s); + else { + (void) strncpy(errbuf, s, errbuf_size-1); + errbuf[errbuf_size-1] = '\0'; + } + } + + return(len); +} + +/* + - regatoi - internal routine to implement REG_ATOI + == static char *regatoi(const regex_t *preg, char *localbuf); + */ +static char * +regatoi(preg, localbuf) +const regex_t *preg; +char *localbuf; +{ + register struct rerr *r; + + for (r = rerrs; r->code != 0; r++) + if (strcmp(r->name, preg->re_endp) == 0) + break; + if (r->code == 0) + return("0"); + + sprintf(localbuf, "%d", r->code); + return(localbuf); +} diff --git a/cbits/regex/regexec.c b/cbits/regex/regexec.c new file mode 100644 index 0000000..80a7ad0 --- /dev/null +++ b/cbits/regex/regexec.c @@ -0,0 +1,181 @@ +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 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. + * + * @(#)regexec.c 8.3 (Berkeley) 3/20/94 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regexec.c 8.3 (Berkeley) 3/20/94"; +#endif /* LIBC_SCCS and not lint */ + +/* + * the outer shell of regexec() + * + * This file includes engine.c *twice*, after muchos fiddling with the + * macros that code uses. This lets the same code operate on two different + * representations for state sets. + */ +#include +#include +#include +#include +#include +#include +#include + +#include "utils.h" +#include "regex2.h" + +static int nope = 0; /* for use in asserts; shuts lint up */ + +/* macros for manipulating states, small version */ +#define states long +#define states1 states /* for later use in regexec() decision */ +#define CLEAR(v) ((v) = 0) +#define SET0(v, n) ((v) &= ~((unsigned long)1 << (n))) +#define SET1(v, n) ((v) |= (unsigned long)1 << (n)) +#define ISSET(v, n) (((v) & ((unsigned long)1 << (n))) != 0) +#define ASSIGN(d, s) ((d) = (s)) +#define EQ(a, b) ((a) == (b)) +#define STATEVARS long dummy /* dummy version */ +#define STATESETUP(m, n) /* nothing */ +#define STATETEARDOWN(m) /* nothing */ +#define SETUP(v) ((v) = 0) +#define onestate long +#define INIT(o, n) ((o) = (unsigned long)1 << (n)) +#define INC(o) ((o) <<= 1) +#define ISSTATEIN(v, o) (((v) & (o)) != 0) +/* some abbreviations; note that some of these know variable names! */ +/* do "if I'm here, I can also be there" etc without branches */ +#define FWD(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) << (n)) +#define BACK(dst, src, n) ((dst) |= ((unsigned long)(src)&(here)) >> (n)) +#define ISSETBACK(v, n) (((v) & ((unsigned long)here >> (n))) != 0) +/* function names */ +#define SNAMES /* engine.c looks after details */ + +#include "engine.c" + +/* now undo things */ +#undef states +#undef CLEAR +#undef SET0 +#undef SET1 +#undef ISSET +#undef ASSIGN +#undef EQ +#undef STATEVARS +#undef STATESETUP +#undef STATETEARDOWN +#undef SETUP +#undef onestate +#undef INIT +#undef INC +#undef ISSTATEIN +#undef FWD +#undef BACK +#undef ISSETBACK +#undef SNAMES + +/* macros for manipulating states, large version */ +#define states char * +#define CLEAR(v) memset(v, 0, m->g->nstates) +#define SET0(v, n) ((v)[n] = 0) +#define SET1(v, n) ((v)[n] = 1) +#define ISSET(v, n) ((v)[n]) +#define ASSIGN(d, s) memcpy(d, s, m->g->nstates) +#define EQ(a, b) (memcmp(a, b, m->g->nstates) == 0) +#define STATEVARS long vn; char *space +#define STATESETUP(m, nv) { (m)->space = malloc((nv)*(m)->g->nstates); \ + if ((m)->space == NULL) return(REG_ESPACE); \ + (m)->vn = 0; } +#define STATETEARDOWN(m) { free((m)->space); } +#define SETUP(v) ((v) = &m->space[m->vn++ * m->g->nstates]) +#define onestate long +#define INIT(o, n) ((o) = (n)) +#define INC(o) ((o)++) +#define ISSTATEIN(v, o) ((v)[o]) +/* some abbreviations; note that some of these know variable names! */ +/* do "if I'm here, I can also be there" etc without branches */ +#define FWD(dst, src, n) ((dst)[here+(n)] |= (src)[here]) +#define BACK(dst, src, n) ((dst)[here-(n)] |= (src)[here]) +#define ISSETBACK(v, n) ((v)[here - (n)]) +/* function names */ +#define LNAMES /* flag */ + +#include "engine.c" + +/* + - regexec - interface for matching + = extern int regexec(const regex_t *, const char *, size_t, \ + = regmatch_t [], int); + = #define REG_NOTBOL 00001 + = #define REG_NOTEOL 00002 + = #define REG_STARTEND 00004 + = #define REG_TRACE 00400 // tracing of execution + = #define REG_LARGE 01000 // force large representation + = #define REG_BACKR 02000 // force use of backref code + * + * We put this here so we can exploit knowledge of the state representation + * when choosing which matcher to call. Also, by this point the matchers + * have been prototyped. + */ +int /* 0 success, REG_NOMATCH failure */ +regexec(preg, string, nmatch, pmatch, eflags) +const regex_t *preg; +const char *string; +size_t nmatch; +regmatch_t pmatch[]; +int eflags; +{ + register struct re_guts *g = preg->re_g; +#ifdef REDEBUG +# define GOODFLAGS(f) (f) +#else +# define GOODFLAGS(f) ((f)&(REG_NOTBOL|REG_NOTEOL|REG_STARTEND)) +#endif + + if (preg->re_magic != MAGIC1 || g->magic != MAGIC2) + return(REG_BADPAT); + assert(!(g->iflags&BAD)); + if (g->iflags&BAD) /* backstop for no-debug case */ + return(REG_BADPAT); + eflags = GOODFLAGS(eflags); + + if (g->nstates <= CHAR_BIT*sizeof(states1) && !(eflags®_LARGE)) + return(smatcher(g, (char *)string, nmatch, pmatch, eflags)); + else + return(lmatcher(g, (char *)string, nmatch, pmatch, eflags)); +} diff --git a/cbits/regex/regfree.c b/cbits/regex/regfree.c new file mode 100644 index 0000000..97dab84 --- /dev/null +++ b/cbits/regex/regfree.c @@ -0,0 +1,87 @@ +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 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. + * + * @(#)regfree.c 8.3 (Berkeley) 3/20/94 + * + * $FreeBSD: src/lib/libc/regex/regfree.c,v 1.1.1.1.14.1 2000/07/31 06:30:37 dcs Exp $ + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)regfree.c 8.3 (Berkeley) 3/20/94"; +#endif /* LIBC_SCCS and not lint */ + +#include +#include +#include +#include +#include + +#include "utils.h" +#include "regex2.h" + +/* + - regfree - free everything + = extern void regfree(regex_t *); + */ +void +regfree(preg) +regex_t *preg; +{ + register struct re_guts *g; + + if (preg->re_magic != MAGIC1) /* oops */ + return; /* nice to complain, but hard */ + + g = preg->re_g; + if (g == NULL || g->magic != MAGIC2) /* oops again */ + return; + preg->re_magic = 0; /* mark it invalid */ + g->magic = 0; /* mark it invalid */ + + if (g->strip != NULL) + free((char *)g->strip); + if (g->sets != NULL) + free((char *)g->sets); + if (g->setbits != NULL) + free((char *)g->setbits); + if (g->must != NULL) + free(g->must); + if (g->charjump != NULL) + free(&g->charjump[CHAR_MIN]); + if (g->matchjump != NULL) + free(g->matchjump); + free((char *)g); +} diff --git a/cbits/regex/utils.h b/cbits/regex/utils.h new file mode 100644 index 0000000..d804d8d --- /dev/null +++ b/cbits/regex/utils.h @@ -0,0 +1,57 @@ +/*- + * Copyright (c) 1992, 1993, 1994 Henry Spencer. + * Copyright (c) 1992, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Henry Spencer. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 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. + * + * @(#)utils.h 8.3 (Berkeley) 3/20/94 + */ + +/* utility definitions */ +#define DUPMAX _POSIX2_RE_DUP_MAX /* xxx is this right? */ +#define INFINITY (DUPMAX + 1) +#define NC (CHAR_MAX - CHAR_MIN + 1) +typedef unsigned char uch; + +/* switch off assertions (if not already off) if no REDEBUG */ +#ifndef REDEBUG +#ifndef NDEBUG +#define NDEBUG /* no assertions please */ +#endif +#endif +#include + +/* for old systems with bcopy() but no memmove() */ +#ifdef USEBCOPY +#define memmove(d, s, c) bcopy(s, d, c) +#endif -- 1.7.10.4