--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <regex.h>
+
+#include "utils.h"
+#include "regex2.h"
+#include "debug.ih"
+
+/*
+ - regprint - print a regexp for debugging
+ == void regprint(regex_t *r, FILE *d);
+ */
+void
+regprint(r, d)
+regex_t *r;
+FILE *d;
+{
+ register struct re_guts *g = r->re_g;
+ register int i;
+ register int c;
+ register int last;
+ int nincat[NC];
+
+ fprintf(d, "%ld states, %d categories", (long)g->nstates,
+ g->ncategories);
+ fprintf(d, ", first %ld last %ld", (long)g->firststate,
+ (long)g->laststate);
+ if (g->iflags&USEBOL)
+ fprintf(d, ", USEBOL");
+ if (g->iflags&USEEOL)
+ fprintf(d, ", USEEOL");
+ if (g->iflags&BAD)
+ fprintf(d, ", BAD");
+ if (g->nsub > 0)
+ fprintf(d, ", nsub=%ld", (long)g->nsub);
+ if (g->must != NULL)
+ fprintf(d, ", must(%ld) `%*s'", (long)g->mlen, (int)g->mlen,
+ g->must);
+ if (g->backrefs)
+ fprintf(d, ", backrefs");
+ if (g->nplus > 0)
+ fprintf(d, ", nplus %ld", (long)g->nplus);
+ fprintf(d, "\n");
+ s_print(g, d);
+ for (i = 0; i < g->ncategories; i++) {
+ nincat[i] = 0;
+ for (c = CHAR_MIN; c <= CHAR_MAX; c++)
+ if (g->categories[c] == i)
+ nincat[i]++;
+ }
+ fprintf(d, "cc0#%d", nincat[0]);
+ for (i = 1; i < g->ncategories; i++)
+ if (nincat[i] == 1) {
+ for (c = CHAR_MIN; c <= CHAR_MAX; c++)
+ if (g->categories[c] == i)
+ break;
+ fprintf(d, ", %d=%s", i, regchar(c));
+ }
+ fprintf(d, "\n");
+ for (i = 1; i < g->ncategories; i++)
+ if (nincat[i] != 1) {
+ fprintf(d, "cc%d\t", i);
+ last = -1;
+ for (c = CHAR_MIN; c <= CHAR_MAX+1; c++) /* +1 does flush */
+ if (c <= CHAR_MAX && g->categories[c] == i) {
+ if (last < 0) {
+ fprintf(d, "%s", regchar(c));
+ last = c;
+ }
+ } else {
+ if (last >= 0) {
+ if (last != c-1)
+ fprintf(d, "-%s",
+ regchar(c-1));
+ last = -1;
+ }
+ }
+ fprintf(d, "\n");
+ }
+}
+
+/*
+ - s_print - print the strip for debugging
+ == static void s_print(register struct re_guts *g, FILE *d);
+ */
+static void
+s_print(g, d)
+register struct re_guts *g;
+FILE *d;
+{
+ register sop *s;
+ register cset *cs;
+ register int i;
+ register int done = 0;
+ register sop opnd;
+ register int col = 0;
+ register int last;
+ register sopno offset = 2;
+# define GAP() { if (offset % 5 == 0) { \
+ if (col > 40) { \
+ fprintf(d, "\n\t"); \
+ col = 0; \
+ } else { \
+ fprintf(d, " "); \
+ col++; \
+ } \
+ } else \
+ col++; \
+ offset++; \
+ }
+
+ if (OP(g->strip[0]) != OEND)
+ fprintf(d, "missing initial OEND!\n");
+ for (s = &g->strip[1]; !done; s++) {
+ opnd = OPND(*s);
+ switch (OP(*s)) {
+ case OEND:
+ fprintf(d, "\n");
+ done = 1;
+ break;
+ case OCHAR:
+ if (strchr("\\|()^$.[+*?{}!<> ", (char)opnd) != NULL)
+ fprintf(d, "\\%c", (char)opnd);
+ else
+ fprintf(d, "%s", regchar((char)opnd));
+ break;
+ case OBOL:
+ fprintf(d, "^");
+ break;
+ case OEOL:
+ fprintf(d, "$");
+ break;
+ case OBOW:
+ fprintf(d, "\\{");
+ break;
+ case OEOW:
+ fprintf(d, "\\}");
+ break;
+ case OANY:
+ fprintf(d, ".");
+ break;
+ case OANYOF:
+ fprintf(d, "[(%ld)", (long)opnd);
+ cs = &g->sets[opnd];
+ last = -1;
+ for (i = 0; i < g->csetsize+1; i++) /* +1 flushes */
+ if (CHIN(cs, i) && i < g->csetsize) {
+ if (last < 0) {
+ fprintf(d, "%s", regchar(i));
+ last = i;
+ }
+ } else {
+ if (last >= 0) {
+ if (last != i-1)
+ fprintf(d, "-%s",
+ regchar(i-1));
+ last = -1;
+ }
+ }
+ fprintf(d, "]");
+ break;
+ case OBACK_:
+ fprintf(d, "(\\<%ld>", (long)opnd);
+ break;
+ case O_BACK:
+ fprintf(d, "<%ld>\\)", (long)opnd);
+ break;
+ case OPLUS_:
+ fprintf(d, "(+");
+ if (OP(*(s+opnd)) != O_PLUS)
+ fprintf(d, "<%ld>", (long)opnd);
+ break;
+ case O_PLUS:
+ if (OP(*(s-opnd)) != OPLUS_)
+ fprintf(d, "<%ld>", (long)opnd);
+ fprintf(d, "+)");
+ break;
+ case OQUEST_:
+ fprintf(d, "(?");
+ if (OP(*(s+opnd)) != O_QUEST)
+ fprintf(d, "<%ld>", (long)opnd);
+ break;
+ case O_QUEST:
+ if (OP(*(s-opnd)) != OQUEST_)
+ fprintf(d, "<%ld>", (long)opnd);
+ fprintf(d, "?)");
+ break;
+ case OLPAREN:
+ fprintf(d, "((<%ld>", (long)opnd);
+ break;
+ case ORPAREN:
+ fprintf(d, "<%ld>))", (long)opnd);
+ break;
+ case OCH_:
+ fprintf(d, "<");
+ if (OP(*(s+opnd)) != OOR2)
+ fprintf(d, "<%ld>", (long)opnd);
+ break;
+ case OOR1:
+ if (OP(*(s-opnd)) != OOR1 && OP(*(s-opnd)) != OCH_)
+ fprintf(d, "<%ld>", (long)opnd);
+ fprintf(d, "|");
+ break;
+ case OOR2:
+ fprintf(d, "|");
+ if (OP(*(s+opnd)) != OOR2 && OP(*(s+opnd)) != O_CH)
+ fprintf(d, "<%ld>", (long)opnd);
+ break;
+ case O_CH:
+ if (OP(*(s-opnd)) != OOR1)
+ fprintf(d, "<%ld>", (long)opnd);
+ fprintf(d, ">");
+ break;
+ default:
+ fprintf(d, "!%d(%d)!", OP(*s), opnd);
+ break;
+ }
+ if (!done)
+ GAP();
+ }
+}
+
+/*
+ - regchar - make a character printable
+ == static char *regchar(int ch);
+ */
+static char * /* -> representation */
+regchar(ch)
+int ch;
+{
+ static char buf[10];
+
+ if (isprint(ch) || ch == ' ')
+ sprintf(buf, "%c", ch);
+ else
+ sprintf(buf, "\\%o", ch);
+ return(buf);
+}
--- /dev/null
+/*
+ * 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 */
+};
+
+#include "engine.ih"
+
+#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;
+ const register sopno gf = g->firststate+1; /* +1 for OEND */
+ const register sopno gl = g->laststate;
+ char *start;
+ char *stop;
+
+ /* 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) {
+ 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);
+
+ /* 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((char *)NULL); /* dummy */
+}
+
+/*
+ - 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 long 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(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
--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <regex.h>
+#include <assert.h>
+
+#include "main.ih"
+
+char *progname;
+int debug = 0;
+int line = 0;
+int status = 0;
+
+int copts = REG_EXTENDED;
+int eopts = 0;
+regoff_t startoff = 0;
+regoff_t endoff = 0;
+
+
+extern int split();
+extern void regprint();
+
+/*
+ - main - do the simple case, hand off to regress() for regression
+ */
+main(argc, argv)
+int argc;
+char *argv[];
+{
+ regex_t re;
+# define NS 10
+ regmatch_t subs[NS];
+ char erbuf[100];
+ int err;
+ size_t len;
+ int c;
+ int errflg = 0;
+ register int i;
+ extern int optind;
+ extern char *optarg;
+
+ progname = argv[0];
+
+ while ((c = getopt(argc, argv, "c:e:S:E:x")) != EOF)
+ switch (c) {
+ case 'c': /* compile options */
+ copts = options('c', optarg);
+ break;
+ case 'e': /* execute options */
+ eopts = options('e', optarg);
+ break;
+ case 'S': /* start offset */
+ startoff = (regoff_t)atoi(optarg);
+ break;
+ case 'E': /* end offset */
+ endoff = (regoff_t)atoi(optarg);
+ break;
+ case 'x': /* Debugging. */
+ debug++;
+ break;
+ case '?':
+ default:
+ errflg++;
+ break;
+ }
+ if (errflg) {
+ fprintf(stderr, "usage: %s ", progname);
+ fprintf(stderr, "[-c copt][-C][-d] [re]\n");
+ exit(2);
+ }
+
+ if (optind >= argc) {
+ regress(stdin);
+ exit(status);
+ }
+
+ err = regcomp(&re, argv[optind++], copts);
+ if (err) {
+ len = regerror(err, &re, erbuf, sizeof(erbuf));
+ fprintf(stderr, "error %s, %d/%d `%s'\n",
+ eprint(err), len, sizeof(erbuf), erbuf);
+ exit(status);
+ }
+ regprint(&re, stdout);
+
+ if (optind >= argc) {
+ regfree(&re);
+ exit(status);
+ }
+
+ if (eopts®_STARTEND) {
+ subs[0].rm_so = startoff;
+ subs[0].rm_eo = strlen(argv[optind]) - endoff;
+ }
+ err = regexec(&re, argv[optind], (size_t)NS, subs, eopts);
+ if (err) {
+ len = regerror(err, &re, erbuf, sizeof(erbuf));
+ fprintf(stderr, "error %s, %d/%d `%s'\n",
+ eprint(err), len, sizeof(erbuf), erbuf);
+ exit(status);
+ }
+ if (!(copts®_NOSUB)) {
+ len = (int)(subs[0].rm_eo - subs[0].rm_so);
+ if (subs[0].rm_so != -1) {
+ if (len != 0)
+ printf("match `%.*s'\n", len,
+ argv[optind] + subs[0].rm_so);
+ else
+ printf("match `'@%.1s\n",
+ argv[optind] + subs[0].rm_so);
+ }
+ for (i = 1; i < NS; i++)
+ if (subs[i].rm_so != -1)
+ printf("(%d) `%.*s'\n", i,
+ (int)(subs[i].rm_eo - subs[i].rm_so),
+ argv[optind] + subs[i].rm_so);
+ }
+ exit(status);
+}
+
+/*
+ - regress - main loop of regression test
+ == void regress(FILE *in);
+ */
+void
+regress(in)
+FILE *in;
+{
+ char inbuf[1000];
+# define MAXF 10
+ char *f[MAXF];
+ int nf;
+ int i;
+ char erbuf[100];
+ size_t ne;
+ char *badpat = "invalid regular expression";
+# define SHORT 10
+ char *bpname = "REG_BADPAT";
+ regex_t re;
+
+ while (fgets(inbuf, sizeof(inbuf), in) != NULL) {
+ line++;
+ if (inbuf[0] == '#' || inbuf[0] == '\n')
+ continue; /* NOTE CONTINUE */
+ inbuf[strlen(inbuf)-1] = '\0'; /* get rid of stupid \n */
+ if (debug)
+ fprintf(stdout, "%d:\n", line);
+ nf = split(inbuf, f, MAXF, "\t\t");
+ if (nf < 3) {
+ fprintf(stderr, "bad input, line %d\n", line);
+ exit(1);
+ }
+ for (i = 0; i < nf; i++)
+ if (strcmp(f[i], "\"\"") == 0)
+ f[i] = "";
+ if (nf <= 3)
+ f[3] = NULL;
+ if (nf <= 4)
+ f[4] = NULL;
+ try(f[0], f[1], f[2], f[3], f[4], options('c', f[1]));
+ if (opt('&', f[1])) /* try with either type of RE */
+ try(f[0], f[1], f[2], f[3], f[4],
+ options('c', f[1]) &~ REG_EXTENDED);
+ }
+
+ ne = regerror(REG_BADPAT, (regex_t *)NULL, erbuf, sizeof(erbuf));
+ if (strcmp(erbuf, badpat) != 0 || ne != strlen(badpat)+1) {
+ fprintf(stderr, "end: regerror() test gave `%s' not `%s'\n",
+ erbuf, badpat);
+ status = 1;
+ }
+ ne = regerror(REG_BADPAT, (regex_t *)NULL, erbuf, (size_t)SHORT);
+ if (strncmp(erbuf, badpat, SHORT-1) != 0 || erbuf[SHORT-1] != '\0' ||
+ ne != strlen(badpat)+1) {
+ fprintf(stderr, "end: regerror() short test gave `%s' not `%.*s'\n",
+ erbuf, SHORT-1, badpat);
+ status = 1;
+ }
+ ne = regerror(REG_ITOA|REG_BADPAT, (regex_t *)NULL, erbuf, sizeof(erbuf));
+ if (strcmp(erbuf, bpname) != 0 || ne != strlen(bpname)+1) {
+ fprintf(stderr, "end: regerror() ITOA test gave `%s' not `%s'\n",
+ erbuf, bpname);
+ status = 1;
+ }
+ re.re_endp = bpname;
+ ne = regerror(REG_ATOI, &re, erbuf, sizeof(erbuf));
+ if (atoi(erbuf) != (int)REG_BADPAT) {
+ fprintf(stderr, "end: regerror() ATOI test gave `%s' not `%ld'\n",
+ erbuf, (long)REG_BADPAT);
+ status = 1;
+ } else if (ne != strlen(erbuf)+1) {
+ fprintf(stderr, "end: regerror() ATOI test len(`%s') = %ld\n",
+ erbuf, (long)REG_BADPAT);
+ status = 1;
+ }
+}
+
+/*
+ - try - try it, and report on problems
+ == void try(char *f0, char *f1, char *f2, char *f3, char *f4, int opts);
+ */
+void
+try(f0, f1, f2, f3, f4, opts)
+char *f0;
+char *f1;
+char *f2;
+char *f3;
+char *f4;
+int opts; /* may not match f1 */
+{
+ regex_t re;
+# define NSUBS 10
+ regmatch_t subs[NSUBS];
+# define NSHOULD 15
+ char *should[NSHOULD];
+ int nshould;
+ char erbuf[100];
+ int err;
+ int len;
+ char *type = (opts & REG_EXTENDED) ? "ERE" : "BRE";
+ register int i;
+ char *grump;
+ char f0copy[1000];
+ char f2copy[1000];
+
+ strcpy(f0copy, f0);
+ re.re_endp = (opts®_PEND) ? f0copy + strlen(f0copy) : NULL;
+ fixstr(f0copy);
+ err = regcomp(&re, f0copy, opts);
+ if (err != 0 && (!opt('C', f1) || err != efind(f2))) {
+ /* unexpected error or wrong error */
+ len = regerror(err, &re, erbuf, sizeof(erbuf));
+ fprintf(stderr, "%d: %s error %s, %d/%d `%s'\n",
+ line, type, eprint(err), len,
+ sizeof(erbuf), erbuf);
+ status = 1;
+ } else if (err == 0 && opt('C', f1)) {
+ /* unexpected success */
+ fprintf(stderr, "%d: %s should have given REG_%s\n",
+ line, type, f2);
+ status = 1;
+ err = 1; /* so we won't try regexec */
+ }
+
+ if (err != 0) {
+ regfree(&re);
+ return;
+ }
+
+ strcpy(f2copy, f2);
+ fixstr(f2copy);
+
+ if (options('e', f1)®_STARTEND) {
+ if (strchr(f2, '(') == NULL || strchr(f2, ')') == NULL)
+ fprintf(stderr, "%d: bad STARTEND syntax\n", line);
+ subs[0].rm_so = strchr(f2, '(') - f2 + 1;
+ subs[0].rm_eo = strchr(f2, ')') - f2;
+ }
+ err = regexec(&re, f2copy, NSUBS, subs, options('e', f1));
+
+ if (err != 0 && (f3 != NULL || err != REG_NOMATCH)) {
+ /* unexpected error or wrong error */
+ len = regerror(err, &re, erbuf, sizeof(erbuf));
+ fprintf(stderr, "%d: %s exec error %s, %d/%d `%s'\n",
+ line, type, eprint(err), len,
+ sizeof(erbuf), erbuf);
+ status = 1;
+ } else if (err != 0) {
+ /* nothing more to check */
+ } else if (f3 == NULL) {
+ /* unexpected success */
+ fprintf(stderr, "%d: %s exec should have failed\n",
+ line, type);
+ status = 1;
+ err = 1; /* just on principle */
+ } else if (opts®_NOSUB) {
+ /* nothing more to check */
+ } else if ((grump = check(f2, subs[0], f3)) != NULL) {
+ fprintf(stderr, "%d: %s %s\n", line, type, grump);
+ status = 1;
+ err = 1;
+ }
+
+ if (err != 0 || f4 == NULL) {
+ regfree(&re);
+ return;
+ }
+
+ for (i = 1; i < NSHOULD; i++)
+ should[i] = NULL;
+ nshould = split(f4, should+1, NSHOULD-1, ",");
+ if (nshould == 0) {
+ nshould = 1;
+ should[1] = "";
+ }
+ for (i = 1; i < NSUBS; i++) {
+ grump = check(f2, subs[i], should[i]);
+ if (grump != NULL) {
+ fprintf(stderr, "%d: %s $%d %s\n", line,
+ type, i, grump);
+ status = 1;
+ err = 1;
+ }
+ }
+
+ regfree(&re);
+}
+
+/*
+ - options - pick options out of a regression-test string
+ == int options(int type, char *s);
+ */
+int
+options(type, s)
+int type; /* 'c' compile, 'e' exec */
+char *s;
+{
+ register char *p;
+ register int o = (type == 'c') ? copts : eopts;
+ register char *legal = (type == 'c') ? "bisnmp" : "^$#tl";
+
+ for (p = s; *p != '\0'; p++)
+ if (strchr(legal, *p) != NULL)
+ switch (*p) {
+ case 'b':
+ o &= ~REG_EXTENDED;
+ break;
+ case 'i':
+ o |= REG_ICASE;
+ break;
+ case 's':
+ o |= REG_NOSUB;
+ break;
+ case 'n':
+ o |= REG_NEWLINE;
+ break;
+ case 'm':
+ o &= ~REG_EXTENDED;
+ o |= REG_NOSPEC;
+ break;
+ case 'p':
+ o |= REG_PEND;
+ break;
+ case '^':
+ o |= REG_NOTBOL;
+ break;
+ case '$':
+ o |= REG_NOTEOL;
+ break;
+ case '#':
+ o |= REG_STARTEND;
+ break;
+ case 't': /* trace */
+ o |= REG_TRACE;
+ break;
+ case 'l': /* force long representation */
+ o |= REG_LARGE;
+ break;
+ case 'r': /* force backref use */
+ o |= REG_BACKR;
+ break;
+ }
+ return(o);
+}
+
+/*
+ - opt - is a particular option in a regression string?
+ == int opt(int c, char *s);
+ */
+int /* predicate */
+opt(c, s)
+int c;
+char *s;
+{
+ return(strchr(s, c) != NULL);
+}
+
+/*
+ - fixstr - transform magic characters in strings
+ == void fixstr(register char *p);
+ */
+void
+fixstr(p)
+register char *p;
+{
+ if (p == NULL)
+ return;
+
+ for (; *p != '\0'; p++)
+ if (*p == 'N')
+ *p = '\n';
+ else if (*p == 'T')
+ *p = '\t';
+ else if (*p == 'S')
+ *p = ' ';
+ else if (*p == 'Z')
+ *p = '\0';
+}
+
+/*
+ - check - check a substring match
+ == char *check(char *str, regmatch_t sub, char *should);
+ */
+char * /* NULL or complaint */
+check(str, sub, should)
+char *str;
+regmatch_t sub;
+char *should;
+{
+ register int len;
+ register int shlen;
+ register char *p;
+ static char grump[500];
+ register char *at = NULL;
+
+ if (should != NULL && strcmp(should, "-") == 0)
+ should = NULL;
+ if (should != NULL && should[0] == '@') {
+ at = should + 1;
+ should = "";
+ }
+
+ /* check rm_so and rm_eo for consistency */
+ if (sub.rm_so > sub.rm_eo || (sub.rm_so == -1 && sub.rm_eo != -1) ||
+ (sub.rm_so != -1 && sub.rm_eo == -1) ||
+ (sub.rm_so != -1 && sub.rm_so < 0) ||
+ (sub.rm_eo != -1 && sub.rm_eo < 0) ) {
+ sprintf(grump, "start %ld end %ld", (long)sub.rm_so,
+ (long)sub.rm_eo);
+ return(grump);
+ }
+
+ /* check for no match */
+ if (sub.rm_so == -1 && should == NULL)
+ return(NULL);
+ if (sub.rm_so == -1)
+ return("did not match");
+
+ /* check for in range */
+ if (sub.rm_eo > strlen(str)) {
+ sprintf(grump, "start %ld end %ld, past end of string",
+ (long)sub.rm_so, (long)sub.rm_eo);
+ return(grump);
+ }
+
+ len = (int)(sub.rm_eo - sub.rm_so);
+ shlen = (int)strlen(should);
+ p = str + sub.rm_so;
+
+ /* check for not supposed to match */
+ if (should == NULL) {
+ sprintf(grump, "matched `%.*s'", len, p);
+ return(grump);
+ }
+
+ /* check for wrong match */
+ if (len != shlen || strncmp(p, should, (size_t)shlen) != 0) {
+ sprintf(grump, "matched `%.*s' instead", len, p);
+ return(grump);
+ }
+ if (shlen > 0)
+ return(NULL);
+
+ /* check null match in right place */
+ if (at == NULL)
+ return(NULL);
+ shlen = strlen(at);
+ if (shlen == 0)
+ shlen = 1; /* force check for end-of-string */
+ if (strncmp(p, at, shlen) != 0) {
+ sprintf(grump, "matched null at `%.20s'", p);
+ return(grump);
+ }
+ return(NULL);
+}
+
+/*
+ - eprint - convert error number to name
+ == static char *eprint(int err);
+ */
+static char *
+eprint(err)
+int err;
+{
+ static char epbuf[100];
+ size_t len;
+
+ len = regerror(REG_ITOA|err, (regex_t *)NULL, epbuf, sizeof(epbuf));
+ assert(len <= sizeof(epbuf));
+ return(epbuf);
+}
+
+/*
+ - efind - convert error name to number
+ == static int efind(char *name);
+ */
+static int
+efind(name)
+char *name;
+{
+ static char efbuf[100];
+ size_t n;
+ regex_t re;
+
+ sprintf(efbuf, "REG_%s", name);
+ assert(strlen(efbuf) < sizeof(efbuf));
+ re.re_endp = efbuf;
+ (void) regerror(REG_ATOI, &re, efbuf, sizeof(efbuf));
+ return(atoi(efbuf));
+}
--- /dev/null
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <regex.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) */
+};
+
+#include "regcomp.ih"
+
+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 <assert.h>s have bugs too */
+#endif
+
+/*
+ - 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->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);
+ 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);
+ 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 '(':
+ 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);
+ 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 '\\':
+ REQUIRE(MORE(), REG_EESCAPE);
+ c = GETNEXT();
+ ordinary(p, c);
+ break;
+ case '{': /* okay as ordinary except if digit follows */
+ REQUIRE(!MORE() || !isdigit(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(PEEK2())) ))
+ return; /* no repetition, we're done */
+ NEXT();
+
+ 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(PEEK())) {
+ count2 = p_count(p);
+ 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();
+ REQUIRE(MORE(), REG_EBRACE);
+ SETERROR(REG_BADBR);
+ }
+ break;
+ }
+
+ if (!MORE())
+ return;
+ c = PEEK();
+ if (!( c == '*' || c == '+' || c == '?' ||
+ (c == '{' && MORE2() && isdigit(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;
+{
+ 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++;
+ }
+
+ 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<<CHAR_BIT)
+
+ pos = HERE(); /* repetion op, if any, covers from here */
+
+ assert(MORE()); /* caller should have ensured this */
+ c = GETNEXT();
+ if (c == '\\') {
+ REQUIRE(MORE(), REG_EESCAPE);
+ c = BACKSL | (unsigned char)GETNEXT();
+ }
+ switch (c) {
+ case '.':
+ if (p->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);
+ 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 '*':
+ REQUIRE(starordinary, REG_BADRPT);
+ /* FALLTHROUGH */
+ default:
+ ordinary(p, (char)c); /* takes off BACKSL, if any */
+ 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(PEEK())) {
+ count2 = p_count(p);
+ 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();
+ REQUIRE(MORE(), REG_EBRACE);
+ SETERROR(REG_BADBR);
+ }
+ } else if (c == (unsigned char)'$') /* $ (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(PEEK()) && count <= DUPMAX) {
+ count = count*10 + (GETNEXT() - '0');
+ ndigits++;
+ }
+
+ 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, '-');
+ 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();
+ REQUIRE(MORE(), REG_EBRACK);
+ c = PEEK();
+ REQUIRE(c != '-' && c != ']', REG_ECTYPE);
+ p_b_cclass(p, cs);
+ REQUIRE(MORE(), REG_EBRACK);
+ REQUIRE(EATTWO(':', ']'), REG_ECTYPE);
+ break;
+ case '=': /* equivalence class */
+ NEXT2();
+ REQUIRE(MORE(), REG_EBRACK);
+ c = PEEK();
+ REQUIRE(c != '-' && c != ']', REG_ECOLLATE);
+ p_b_eclass(p, cs);
+ REQUIRE(MORE(), REG_EBRACK);
+ 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;
+/* xxx what about signed chars here... */
+ REQUIRE(start <= finish, REG_ERANGE);
+ for (i = start; i <= finish; i++)
+ 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 char *sp = p->next;
+ register struct cclass *cp;
+ register size_t len;
+ register char *u;
+ register char c;
+
+ while (MORE() && isalpha(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;
+ }
+
+ u = cp->chars;
+ while ((c = *u++) != '\0')
+ CHadd(cs, c);
+ for (u = cp->multis; *u != '\0'; u += strlen(u) + 1)
+ MCadd(p, cs, u);
+}
+
+/*
+ - 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;
+
+ REQUIRE(MORE(), REG_EBRACK);
+ if (!EATTWO('[', '.'))
+ return(GETNEXT());
+
+ /* collating symbol */
+ value = p_b_coll_elem(p, '.');
+ 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;
+{
+ 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];
+
+ 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(ch) && othercase(ch) != ch)
+ bothcases(p, ch);
+ else {
+ EMIT(OCHAR, (unsigned char)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 *)realloc((char *)p->g->sets,
+ nc * sizeof(cset));
+ if (p->g->setbits == NULL)
+ p->g->setbits = (uch *)malloc(nbytes);
+ else {
+ p->g->setbits = (uch *)realloc((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 uch 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 = realloc(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';
+}
+
+/*
+ - 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 = realloc(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);
+}
+
+/*
+ - 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 = (unsigned char)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 = (unsigned char)c1;
+ register unsigned uc2 = (unsigned char)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<<OPSHIFT);
+
+ /* deal with undersized strip */
+ if (p->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<<OPSHIFT);
+ p->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;
+
+ /* avoid making error situations worse */
+ if (p->error != 0)
+ return;
+
+ /* find the longest OCHAR sequence in strip */
+ newlen = 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_:
+ 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 */
+ default: /* things that break a sequence */
+ if (newlen > g->mlen) { /* ends one */
+ start = newstart;
+ g->mlen = newlen;
+ }
+ newlen = 0;
+ break;
+ }
+ } while (OP(s) != OEND);
+
+ if (g->mlen == 0) /* there isn't one */
+ 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;
+ 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 */
+}
+
+/*
+ - 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);
+}
--- /dev/null
+/*
+ * First, the stuff that ends up in the outside-world include file
+ = typedef off_t regoff_t;
+ = typedef struct {
+ = int re_magic;
+ = size_t re_nsub; // number of parenthesized subexpressions
+ = const char *re_endp; // end pointer for REG_PEND
+ = struct re_guts *re_g; // none of your business :-)
+ = } regex_t;
+ = typedef struct {
+ = regoff_t rm_so; // start of match
+ = regoff_t rm_eo; // end of match
+ = } regmatch_t;
+ */
+/*
+ * internals of regex_t
+ */
+#define MAGIC1 ((('r'^0200)<<8) | 'e')
+
+/*
+ * The internal representation is a *strip*, a sequence of
+ * operators ending with an endmarker. (Some terminology etc. is a
+ * historical relic of earlier versions which used multiple strips.)
+ * Certain oddities in the representation are there to permit running
+ * the machinery backwards; in particular, any deviation from sequential
+ * flow must be marked at both its source and its destination. Some
+ * fine points:
+ *
+ * - OPLUS_ and O_PLUS are *inside* the loop they create.
+ * - OQUEST_ and O_QUEST are *outside* the bypass they create.
+ * - OCH_ and O_CH are *outside* the multi-way branch they create, while
+ * OOR1 and OOR2 are respectively the end and the beginning of one of
+ * the branches. Note that there is an implicit OOR2 following OCH_
+ * and an implicit OOR1 preceding O_CH.
+ *
+ * In state representations, an operator's bit is on to signify a state
+ * immediately *preceding* "execution" of that operator.
+ */
+typedef long sop; /* strip operator */
+typedef long sopno;
+#define OPRMASK 0x7c000000
+#define OPDMASK 0x03ffffff
+#define OPSHIFT (26)
+#define OP(n) ((n)&OPRMASK)
+#define OPND(n) ((n)&OPDMASK)
+#define SOP(op, opnd) ((op)|(opnd))
+/* operators meaning operand */
+/* (back, fwd are offsets) */
+#define OEND (1<<OPSHIFT) /* endmarker - */
+#define OCHAR (2<<OPSHIFT) /* character unsigned char */
+#define OBOL (3<<OPSHIFT) /* left anchor - */
+#define OEOL (4<<OPSHIFT) /* right anchor - */
+#define OANY (5<<OPSHIFT) /* . - */
+#define OANYOF (6<<OPSHIFT) /* [...] set number */
+#define OBACK_ (7<<OPSHIFT) /* begin \d paren number */
+#define O_BACK (8<<OPSHIFT) /* end \d paren number */
+#define OPLUS_ (9<<OPSHIFT) /* + prefix fwd to suffix */
+#define O_PLUS (10<<OPSHIFT) /* + suffix back to prefix */
+#define OQUEST_ (11<<OPSHIFT) /* ? prefix fwd to suffix */
+#define O_QUEST (12<<OPSHIFT) /* ? suffix back to prefix */
+#define OLPAREN (13<<OPSHIFT) /* ( fwd to ) */
+#define ORPAREN (14<<OPSHIFT) /* ) back to ( */
+#define OCH_ (15<<OPSHIFT) /* begin choice fwd to OOR2 */
+#define OOR1 (16<<OPSHIFT) /* | pt. 1 back to OOR1 or OCH_ */
+#define OOR2 (17<<OPSHIFT) /* | pt. 2 fwd to OOR2 or O_CH */
+#define O_CH (18<<OPSHIFT) /* end choice back to OOR1 */
+#define OBOW (19<<OPSHIFT) /* begin word - */
+#define OEOW (20<<OPSHIFT) /* end word - */
+
+/*
+ * Structure for [] character-set representation. Character sets are
+ * done as bit vectors, grouped 8 to a byte vector for compactness.
+ * The individual set therefore has both a pointer to the byte vector
+ * and a mask to pick out the relevant bit of each byte. A hash code
+ * simplifies testing whether two sets could be identical.
+ *
+ * This will get trickier for multicharacter collating elements. As
+ * preliminary hooks for dealing with such things, we also carry along
+ * a string of multi-character elements, and decide the size of the
+ * vectors at run time.
+ */
+typedef struct {
+ uch *ptr; /* -> uch [csetsize] */
+ uch mask; /* bit within array */
+ uch hash; /* hash code */
+ size_t smultis;
+ char *multis; /* -> char[smulti] ab\0cd\0ef\0\0 */
+} cset;
+/* note that CHadd and CHsub are unsafe, and CHIN doesn't yield 0/1 */
+#define CHadd(cs, c) ((cs)->ptr[(uch)(c)] |= (cs)->mask, (cs)->hash += (c))
+#define CHsub(cs, c) ((cs)->ptr[(uch)(c)] &= ~(cs)->mask, (cs)->hash -= (c))
+#define CHIN(cs, c) ((cs)->ptr[(uch)(c)] & (cs)->mask)
+#define MCadd(p, cs, cp) mcadd(p, cs, cp) /* regcomp() internal fns */
+#define MCsub(p, cs, cp) mcsub(p, cs, cp)
+#define MCin(p, cs, cp) mcin(p, cs, cp)
+
+/* stuff for character categories */
+typedef unsigned char cat_t;
+
+/*
+ * main compiled-expression structure
+ */
+struct re_guts {
+ int magic;
+# define MAGIC2 ((('R'^0200)<<8)|'E')
+ sop *strip; /* malloced area for strip */
+ int csetsize; /* number of bits in a cset vector */
+ int ncsets; /* number of csets in use */
+ cset *sets; /* -> cset [ncsets] */
+ uch *setbits; /* -> uch[csetsize][ncsets/CHAR_BIT] */
+ int cflags; /* copy of regcomp() cflags argument */
+ sopno nstates; /* = number of sops */
+ sopno firststate; /* the initial OEND (normally 0) */
+ sopno laststate; /* the final OEND */
+ int iflags; /* internal flags */
+# define USEBOL 01 /* used ^ */
+# define USEEOL 02 /* used $ */
+# define BAD 04 /* something wrong */
+ int nbol; /* number of ^ used */
+ int neol; /* number of $ used */
+ int ncategories; /* how many character categories */
+ cat_t *categories; /* ->catspace[-CHAR_MIN] */
+ char *must; /* match must contain this string */
+ int mlen; /* length of must */
+ size_t nsub; /* copy of re_nsub */
+ int backrefs; /* does it use back references? */
+ sopno nplus; /* how deep does it nest +s? */
+ /* catspace must be last */
+ cat_t catspace[1]; /* actually [NC] */
+};
+
+/* misc utilities */
+#define OUT (CHAR_MAX+1) /* a non-character value */
+#define ISWORD(c) (isalnum(c) || (c) == '_')
--- /dev/null
+#include <stdio.h>
+#include <string.h>
+
+/*
+ - split - divide a string into fields, like awk split()
+ = int split(char *string, char *fields[], int nfields, char *sep);
+ */
+int /* number of fields, including overflow */
+split(string, fields, nfields, sep)
+char *string;
+char *fields[]; /* list is not NULL-terminated */
+int nfields; /* number of entries available in fields[] */
+char *sep; /* "" white, "c" single char, "ab" [ab]+ */
+{
+ register char *p = string;
+ register char c; /* latest character */
+ register char sepc = sep[0];
+ register char sepc2;
+ register int fn;
+ register char **fp = fields;
+ register char *sepp;
+ register int trimtrail;
+
+ /* white space */
+ if (sepc == '\0') {
+ while ((c = *p++) == ' ' || c == '\t')
+ continue;
+ p--;
+ trimtrail = 1;
+ sep = " \t"; /* note, code below knows this is 2 long */
+ sepc = ' ';
+ } else
+ trimtrail = 0;
+ sepc2 = sep[1]; /* now we can safely pick this up */
+
+ /* catch empties */
+ if (*p == '\0')
+ return(0);
+
+ /* single separator */
+ if (sepc2 == '\0') {
+ fn = nfields;
+ for (;;) {
+ *fp++ = p;
+ fn--;
+ if (fn == 0)
+ break;
+ while ((c = *p++) != sepc)
+ if (c == '\0')
+ return(nfields - fn);
+ *(p-1) = '\0';
+ }
+ /* we have overflowed the fields vector -- just count them */
+ fn = nfields;
+ for (;;) {
+ while ((c = *p++) != sepc)
+ if (c == '\0')
+ return(fn);
+ fn++;
+ }
+ /* not reached */
+ }
+
+ /* two separators */
+ if (sep[2] == '\0') {
+ fn = nfields;
+ for (;;) {
+ *fp++ = p;
+ fn--;
+ while ((c = *p++) != sepc && c != sepc2)
+ if (c == '\0') {
+ if (trimtrail && **(fp-1) == '\0')
+ fn++;
+ return(nfields - fn);
+ }
+ if (fn == 0)
+ break;
+ *(p-1) = '\0';
+ while ((c = *p++) == sepc || c == sepc2)
+ continue;
+ p--;
+ }
+ /* we have overflowed the fields vector -- just count them */
+ fn = nfields;
+ while (c != '\0') {
+ while ((c = *p++) == sepc || c == sepc2)
+ continue;
+ p--;
+ fn++;
+ while ((c = *p++) != '\0' && c != sepc && c != sepc2)
+ continue;
+ }
+ /* might have to trim trailing white space */
+ if (trimtrail) {
+ p--;
+ while ((c = *--p) == sepc || c == sepc2)
+ continue;
+ p++;
+ if (*p != '\0') {
+ if (fn == nfields+1)
+ *p = '\0';
+ fn--;
+ }
+ }
+ return(fn);
+ }
+
+ /* n separators */
+ fn = 0;
+ for (;;) {
+ if (fn < nfields)
+ *fp++ = p;
+ fn++;
+ for (;;) {
+ c = *p++;
+ if (c == '\0')
+ return(fn);
+ sepp = sep;
+ while ((sepc = *sepp++) != '\0' && sepc != c)
+ continue;
+ if (sepc != '\0') /* it was a separator */
+ break;
+ }
+ if (fn < nfields)
+ *(p-1) = '\0';
+ for (;;) {
+ c = *p++;
+ sepp = sep;
+ while ((sepc = *sepp++) != '\0' && sepc != c)
+ continue;
+ if (sepc == '\0') /* it wasn't a separator */
+ break;
+ }
+ p--;
+ }
+
+ /* not reached */
+}
+
+#ifdef TEST_SPLIT
+
+
+/*
+ * test program
+ * pgm runs regression
+ * pgm sep splits stdin lines by sep
+ * pgm str sep splits str by sep
+ * pgm str sep n splits str by sep n times
+ */
+int
+main(argc, argv)
+int argc;
+char *argv[];
+{
+ char buf[512];
+ register int n;
+# define MNF 10
+ char *fields[MNF];
+
+ if (argc > 4)
+ for (n = atoi(argv[3]); n > 0; n--) {
+ (void) strcpy(buf, argv[1]);
+ }
+ else if (argc > 3)
+ for (n = atoi(argv[3]); n > 0; n--) {
+ (void) strcpy(buf, argv[1]);
+ (void) split(buf, fields, MNF, argv[2]);
+ }
+ else if (argc > 2)
+ dosplit(argv[1], argv[2]);
+ else if (argc > 1)
+ while (fgets(buf, sizeof(buf), stdin) != NULL) {
+ buf[strlen(buf)-1] = '\0'; /* stomp newline */
+ dosplit(buf, argv[1]);
+ }
+ else
+ regress();
+
+ exit(0);
+}
+
+dosplit(string, seps)
+char *string;
+char *seps;
+{
+# define NF 5
+ char *fields[NF];
+ register int nf;
+
+ nf = split(string, fields, NF, seps);
+ print(nf, NF, fields);
+}
+
+print(nf, nfp, fields)
+int nf;
+int nfp;
+char *fields[];
+{
+ register int fn;
+ register int bound;
+
+ bound = (nf > nfp) ? nfp : nf;
+ printf("%d:\t", nf);
+ for (fn = 0; fn < bound; fn++)
+ printf("\"%s\"%s", fields[fn], (fn+1 < nf) ? ", " : "\n");
+}
+
+#define RNF 5 /* some table entries know this */
+struct {
+ char *str;
+ char *seps;
+ int nf;
+ char *fi[RNF];
+} tests[] = {
+ "", " ", 0, { "" },
+ " ", " ", 2, { "", "" },
+ "x", " ", 1, { "x" },
+ "xy", " ", 1, { "xy" },
+ "x y", " ", 2, { "x", "y" },
+ "abc def g ", " ", 5, { "abc", "def", "", "g", "" },
+ " a bcd", " ", 4, { "", "", "a", "bcd" },
+ "a b c d e f", " ", 6, { "a", "b", "c", "d", "e f" },
+ " a b c d ", " ", 6, { "", "a", "b", "c", "d " },
+
+ "", " _", 0, { "" },
+ " ", " _", 2, { "", "" },
+ "x", " _", 1, { "x" },
+ "x y", " _", 2, { "x", "y" },
+ "ab _ cd", " _", 2, { "ab", "cd" },
+ " a_b c ", " _", 5, { "", "a", "b", "c", "" },
+ "a b c_d e f", " _", 6, { "a", "b", "c", "d", "e f" },
+ " a b c d ", " _", 6, { "", "a", "b", "c", "d " },
+
+ "", " _~", 0, { "" },
+ " ", " _~", 2, { "", "" },
+ "x", " _~", 1, { "x" },
+ "x y", " _~", 2, { "x", "y" },
+ "ab _~ cd", " _~", 2, { "ab", "cd" },
+ " a_b c~", " _~", 5, { "", "a", "b", "c", "" },
+ "a b_c d~e f", " _~", 6, { "a", "b", "c", "d", "e f" },
+ "~a b c d ", " _~", 6, { "", "a", "b", "c", "d " },
+
+ "", " _~-", 0, { "" },
+ " ", " _~-", 2, { "", "" },
+ "x", " _~-", 1, { "x" },
+ "x y", " _~-", 2, { "x", "y" },
+ "ab _~- cd", " _~-", 2, { "ab", "cd" },
+ " a_b c~", " _~-", 5, { "", "a", "b", "c", "" },
+ "a b_c-d~e f", " _~-", 6, { "a", "b", "c", "d", "e f" },
+ "~a-b c d ", " _~-", 6, { "", "a", "b", "c", "d " },
+
+ "", " ", 0, { "" },
+ " ", " ", 2, { "", "" },
+ "x", " ", 1, { "x" },
+ "xy", " ", 1, { "xy" },
+ "x y", " ", 2, { "x", "y" },
+ "abc def g ", " ", 4, { "abc", "def", "g", "" },
+ " a bcd", " ", 3, { "", "a", "bcd" },
+ "a b c d e f", " ", 6, { "a", "b", "c", "d", "e f" },
+ " a b c d ", " ", 6, { "", "a", "b", "c", "d " },
+
+ "", "", 0, { "" },
+ " ", "", 0, { "" },
+ "x", "", 1, { "x" },
+ "xy", "", 1, { "xy" },
+ "x y", "", 2, { "x", "y" },
+ "abc def g ", "", 3, { "abc", "def", "g" },
+ "\t a bcd", "", 2, { "a", "bcd" },
+ " a \tb\t c ", "", 3, { "a", "b", "c" },
+ "a b c d e ", "", 5, { "a", "b", "c", "d", "e" },
+ "a b\tc d e f", "", 6, { "a", "b", "c", "d", "e f" },
+ " a b c d e f ", "", 6, { "a", "b", "c", "d", "e f " },
+
+ NULL, NULL, 0, { NULL },
+};
+
+regress()
+{
+ char buf[512];
+ register int n;
+ char *fields[RNF+1];
+ register int nf;
+ register int i;
+ register int printit;
+ register char *f;
+
+ for (n = 0; tests[n].str != NULL; n++) {
+ (void) strcpy(buf, tests[n].str);
+ fields[RNF] = NULL;
+ nf = split(buf, fields, RNF, tests[n].seps);
+ printit = 0;
+ if (nf != tests[n].nf) {
+ printf("split `%s' by `%s' gave %d fields, not %d\n",
+ tests[n].str, tests[n].seps, nf, tests[n].nf);
+ printit = 1;
+ } else if (fields[RNF] != NULL) {
+ printf("split() went beyond array end\n");
+ printit = 1;
+ } else {
+ for (i = 0; i < nf && i < RNF; i++) {
+ f = fields[i];
+ if (f == NULL)
+ f = "(NULL)";
+ if (strcmp(f, tests[n].fi[i]) != 0) {
+ printf("split `%s' by `%s', field %d is `%s', not `%s'\n",
+ tests[n].str, tests[n].seps,
+ i, fields[i], tests[n].fi[i]);
+ printit = 1;
+ }
+ }
+ }
+ if (printit)
+ print(nf, RNF, fields);
+ }
+}
+#endif
--- /dev/null
+/* utility definitions */
+#ifdef _POSIX2_RE_DUP_MAX
+#define DUPMAX _POSIX2_RE_DUP_MAX
+#else
+#define DUPMAX 255
+#endif
+#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 <assert.h>
+
+/* for old systems with bcopy() but no memmove() */
+#ifdef USEBCOPY
+#define memmove(d, s, c) bcopy(s, d, c)
+#endif
projects / wxWidgets.git / commitdiff
