#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
struct match {
struct re_guts *g;
int eflags;
regmatch_t *pmatch;
char *offp;
char *beginp;
char *endp;
char *coldp;
char **lastpos;
STATEVARS;
states st;
states fresh;
states tmp;
states empty;
};
#ifdef __cplusplus
extern "C" {
#endif
static int matcher __P((struct re_guts *g, char *string, size_t nmatch, regmatch_t pmatch[], int eflags));
static char *dissect __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst));
static char *backref __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst, sopno lev));
static char *fast __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst));
static char *slow __P((struct match *m, char *start, char *stop, sopno startst, sopno stopst));
static states step __P((struct re_guts *g, sopno start, sopno stop, states bef, int ch, states aft));
#define BOL (OUT+1)
#define EOL (BOL+1)
#define BOLEOL (BOL+2)
#define NOTHING (BOL+3)
#define BOW (BOL+4)
#define EOW (BOL+5)
#define CODEMAX (BOL+5)
#define NONCHAR(c) ((c) > CHAR_MAX)
#define NNONCHAR (CODEMAX-CHAR_MAX)
#ifdef REDEBUG
static void print __P((struct match *m, char *caption, states st, int ch, FILE *d));
#endif
#ifdef REDEBUG
static void at __P((struct match *m, char *title, char *start, char *stop, sopno startst, sopno stopst));
#endif
#ifdef REDEBUG
static char *pchar __P((int ch));
#endif
#ifdef __cplusplus
}
#endif
#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)
#define AT(t, p1, p2, s1, s2)
#define NOTE(s)
#endif
static int
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;
const register sopno gl = g->laststate;
char *start;
char *stop;
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);
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)
return(REG_NOMATCH);
}
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);
for (;;) {
endp = fast(m, start, stop, gf, gl);
if (endp == NULL) {
STATETEARDOWN(m);
return(REG_NOMATCH);
}
if (nmatch == 0 && !g->backrefs)
break;
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;
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;
assert(g->backrefs);
assert(g->nplus == 0 || m->lastpos != NULL);
for (;;) {
if (dp != NULL || endp <= m->coldp)
break;
NOTE("backoff");
endp = slow(m, m->coldp, endp-1, gf, gl);
if (endp == NULL)
break;
#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)
break;
NOTE("false alarm");
start = m->coldp + 1;
assert(start <= stop);
}
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);
}
static char *
dissect(m, start, stop, startst, stopst)
register struct match *m;
char *start;
char *stop;
sopno startst;
sopno stopst;
{
register int i;
register sopno ss;
register sopno es;
register char *sp;
register char *stp;
register char *rest;
register char *tail;
register sopno ssub;
register sopno esub;
register char *ssp;
register char *sep;
register char *oldssp;
register char *dp;
AT("diss", start, stop, startst, stopst);
sp = start;
for (ss = startst; ss < stopst; ss = es) {
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++;
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;
case OQUEST_:
stp = stop;
for (;;) {
rest = slow(m, sp, stp, ss, es);
assert(rest != NULL);
tail = slow(m, rest, stop, es, stopst);
if (tail == stop)
break;
stp = rest - 1;
assert(stp >= sp);
}
ssub = ss + 1;
esub = es - 1;
if (slow(m, sp, rest, ssub, esub) != NULL) {
dp = dissect(m, sp, rest, ssub, esub);
assert(dp == rest);
} else
assert(sp == rest);
sp = rest;
break;
case OPLUS_:
stp = stop;
for (;;) {
rest = slow(m, sp, stp, ss, es);
assert(rest != NULL);
tail = slow(m, rest, stop, es, stopst);
if (tail == stop)
break;
stp = rest - 1;
assert(stp >= sp);
}
ssub = ss + 1;
esub = es - 1;
ssp = sp;
oldssp = ssp;
for (;;) {
sep = slow(m, ssp, rest, ssub, esub);
if (sep == NULL || sep == ssp)
break;
oldssp = ssp;
ssp = sep;
}
if (sep == NULL) {
sep = ssp;
ssp = oldssp;
}
assert(sep == rest);
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 (;;) {
rest = slow(m, sp, stp, ss, es);
assert(rest != NULL);
tail = slow(m, rest, stop, es, stopst);
if (tail == stop)
break;
stp = rest - 1;
assert(stp >= sp);
}
ssub = ss + 1;
esub = ss + OPND(m->g->strip[ss]) - 1;
assert(OP(m->g->strip[esub]) == OOR1);
for (;;) {
if (slow(m, sp, rest, ssub, esub) == rest)
break;
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:
assert(nope);
break;
}
}
assert(sp == stop);
return(sp);
}
static char *
backref(m, start, stop, startst, stopst, lev)
register struct match *m;
char *start;
char *stop;
sopno startst;
sopno stopst;
sopno lev;
{
register int i;
register sopno ss;
register char *sp;
register sopno ssub;
register sopno esub;
register char *ssp;
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;
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)) )
{ }
else
return(NULL);
break;
case OEOL:
if ( (sp == m->endp && !(m->eflags®_NOTEOL)) ||
(sp < m->endp && *sp == '\n' &&
(m->g->cflags®_NEWLINE)) )
{ }
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)) )
{ }
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))) )
{ }
else
return(NULL);
break;
case O_QUEST:
break;
case OOR1:
ss++;
s = m->g->strip[ss];
do {
assert(OP(s) == OOR2);
ss += OPND(s);
} while (OP(s = m->g->strip[ss]) != O_CH);
break;
default:
hard = 1;
break;
}
if (!hard) {
if (sp != stop)
return(NULL);
return(sp);
}
ss--;
AT("hard", sp, stop, ss, stopst);
s = m->g->strip[ss];
switch (OP(s)) {
case OBACK_:
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);
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_:
dp = backref(m, sp, stop, ss+1, stopst, lev);
if (dp != NULL)
return(dp);
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])
return(backref(m, sp, stop, ss+1, stopst, lev-1));
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_:
ssub = ss + 1;
esub = ss + OPND(s) - 1;
assert(OP(m->g->strip[esub]) == OOR1);
for (;;) {
dp = backref(m, sp, stop, ssub, esub, lev);
if (dp != NULL)
return(dp);
if (OP(m->g->strip[esub]) == O_CH)
return(NULL);
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:
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:
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:
assert(nope);
break;
}
assert(nope);
}
static char *
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;
register int flagch;
register int i;
register char *coldp;
CLEAR(st);
SET1(st, startst);
st = step(m->g, startst, stopst, st, NOTHING, st);
ASSIGN(fresh, st);
SP("start", st, *p);
coldp = NULL;
for (;;) {
lastc = c;
c = (p == m->endp) ? OUT : *p;
if (EQ(st, fresh))
coldp = p;
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);
}
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);
}
if (ISSET(st, stopst) || p == stop)
break;
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);
}
static char *
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;
register int flagch;
register int i;
register char *matchp;
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 (;;) {
lastc = c;
c = (p == m->endp) ? OUT : *p;
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);
}
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);
}
if (ISSET(st, stopst))
matchp = p;
if (EQ(st, empty) || p == stop)
break;
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);
}
static states
step(g, start, stop, bef, ch, aft)
register struct re_guts *g;
sopno start;
sopno stop;
register states bef;
int ch;
register states aft;
{
register cset *cs;
register sop s;
register sopno pc;
register onestate here;
register sopno look;
register int i;
for (pc = start, INIT(here, pc); pc != stop; pc++, INC(here)) {
s = g->strip[pc];
switch (OP(s)) {
case OEND:
assert(pc == stop-1);
break;
case OCHAR:
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_:
case O_BACK:
FWD(aft, aft, 1);
break;
case OPLUS_:
FWD(aft, aft, 1);
break;
case O_PLUS:
FWD(aft, aft, 1);
i = ISSETBACK(aft, OPND(s));
BACK(aft, aft, OPND(s));
if (!i && ISSETBACK(aft, OPND(s))) {
pc -= OPND(s) + 1;
INIT(here, pc);
}
break;
case OQUEST_:
FWD(aft, aft, 1);
FWD(aft, aft, OPND(s));
break;
case O_QUEST:
FWD(aft, aft, 1);
break;
case OLPAREN:
case ORPAREN:
FWD(aft, aft, 1);
break;
case OCH_:
FWD(aft, aft, 1);
assert(OP(g->strip[pc+OPND(s)]) == OOR2);
FWD(aft, aft, OPND(s));
break;
case OOR1:
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:
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:
FWD(aft, aft, 1);
break;
default:
assert(nope);
break;
}
}
return(aft);
}
#ifdef REDEBUG
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");
}
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
static char *
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