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freebsd-skq/contrib/perl5/regexec.c

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Initial import of Perl5. The king is dead; long live the king!
1998-09-09 07:00:04 +00:00
/* regexec.c
*/
/*
* "One Ring to rule them all, One Ring to find them..."
*/
/* NOTE: this is derived from Henry Spencer's regexp code, and should not
* confused with the original package (see point 3 below). Thanks, Henry!
*/
/* Additional note: this code is very heavily munged from Henry's version
* in places. In some spots I've traded clarity for efficiency, so don't
* blame Henry for some of the lack of readability.
*/
/* The names of the functions have been changed from regcomp and
* regexec to pregcomp and pregexec in order to avoid conflicts
* with the POSIX routines of the same names.
*/
#ifdef PERL_EXT_RE_BUILD
/* need to replace pregcomp et al, so enable that */
# ifndef PERL_IN_XSUB_RE
# define PERL_IN_XSUB_RE
# endif
/* need access to debugger hooks */
# ifndef DEBUGGING
# define DEBUGGING
# endif
#endif
#ifdef PERL_IN_XSUB_RE
/* We *really* need to overwrite these symbols: */
# define Perl_regexec_flags my_regexec
# define Perl_regdump my_regdump
# define Perl_regprop my_regprop
/* *These* symbols are masked to allow static link. */
# define Perl_pregexec my_pregexec
#endif
/*SUPPRESS 112*/
/*
* pregcomp and pregexec -- regsub and regerror are not used in perl
*
* Copyright (c) 1986 by University of Toronto.
* Written by Henry Spencer. Not derived from licensed software.
*
* Permission is granted to anyone to use this software for any
* purpose on any computer system, and to redistribute it freely,
* subject to the following restrictions:
*
* 1. The author is not responsible for the consequences of use of
* this software, no matter how awful, even if they arise
* from defects in it.
*
* 2. The origin of this software must not be misrepresented, either
* by explicit claim or by omission.
*
* 3. Altered versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
**** Alterations to Henry's code are...
****
**** Copyright (c) 1991-1997, Larry Wall
****
**** You may distribute under the terms of either the GNU General Public
**** License or the Artistic License, as specified in the README file.
*
* Beware that some of this code is subtly aware of the way operator
* precedence is structured in regular expressions. Serious changes in
* regular-expression syntax might require a total rethink.
*/
#include "EXTERN.h"
#include "perl.h"
#include "regcomp.h"
#define RF_tainted 1 /* tainted information used? */
#define RF_warned 2 /* warned about big count? */
#define RF_evaled 4 /* Did an EVAL with setting? */
#define RS_init 1 /* eval environment created */
#define RS_set 2 /* replsv value is set */
#ifndef STATIC
#define STATIC static
#endif
#ifndef PERL_OBJECT
typedef I32 CHECKPOINT;
/*
* Forwards.
*/
static I32 regmatch _((regnode *prog));
static I32 regrepeat _((regnode *p, I32 max));
static I32 regrepeat_hard _((regnode *p, I32 max, I32 *lp));
static I32 regtry _((regexp *prog, char *startpos));
static bool reginclass _((char *p, I32 c));
static CHECKPOINT regcppush _((I32 parenfloor));
static char * regcppop _((void));
#endif
#define REGINCLASS(p,c) (*(p) ? reginclass(p,c) : ANYOF_TEST(p,c))
STATIC CHECKPOINT
regcppush(I32 parenfloor)
{
dTHR;
int retval = PL_savestack_ix;
int i = (PL_regsize - parenfloor) * 4;
int p;
SSCHECK(i + 5);
for (p = PL_regsize; p > parenfloor; p--) {
SSPUSHPTR(PL_regendp[p]);
SSPUSHPTR(PL_regstartp[p]);
SSPUSHPTR(PL_reg_start_tmp[p]);
SSPUSHINT(p);
}
SSPUSHINT(PL_regsize);
SSPUSHINT(*PL_reglastparen);
SSPUSHPTR(PL_reginput);
SSPUSHINT(i + 3);
SSPUSHINT(SAVEt_REGCONTEXT);
return retval;
}
/* These are needed since we do not localize EVAL nodes: */
# define REGCP_SET DEBUG_r(PerlIO_printf(Perl_debug_log, \
" Setting an EVAL scope, savestack=%i\n", \
PL_savestack_ix)); lastcp = PL_savestack_ix
# define REGCP_UNWIND DEBUG_r(lastcp != PL_savestack_ix ? \
PerlIO_printf(Perl_debug_log, \
" Clearing an EVAL scope, savestack=%i..%i\n", \
lastcp, PL_savestack_ix) : 0); regcpblow(lastcp)
STATIC char *
regcppop(void)
{
dTHR;
I32 i = SSPOPINT;
U32 paren = 0;
char *input;
char *tmps;
assert(i == SAVEt_REGCONTEXT);
i = SSPOPINT;
input = (char *) SSPOPPTR;
*PL_reglastparen = SSPOPINT;
PL_regsize = SSPOPINT;
for (i -= 3; i > 0; i -= 4) {
paren = (U32)SSPOPINT;
PL_reg_start_tmp[paren] = (char *) SSPOPPTR;
PL_regstartp[paren] = (char *) SSPOPPTR;
tmps = (char*)SSPOPPTR;
if (paren <= *PL_reglastparen)
PL_regendp[paren] = tmps;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
" restoring \\%d to %d(%d)..%d%s\n",
paren, PL_regstartp[paren] - PL_regbol,
PL_reg_start_tmp[paren] - PL_regbol,
PL_regendp[paren] - PL_regbol,
(paren > *PL_reglastparen ? "(no)" : ""));
);
}
DEBUG_r(
if (*PL_reglastparen + 1 <= PL_regnpar) {
PerlIO_printf(Perl_debug_log,
" restoring \\%d..\\%d to undef\n",
*PL_reglastparen + 1, PL_regnpar);
}
);
for (paren = *PL_reglastparen + 1; paren <= PL_regnpar; paren++) {
if (paren > PL_regsize)
PL_regstartp[paren] = Nullch;
PL_regendp[paren] = Nullch;
}
return input;
}
#define regcpblow(cp) LEAVE_SCOPE(cp)
/*
* pregexec and friends
*/
/*
- pregexec - match a regexp against a string
*/
I32
pregexec(register regexp *prog, char *stringarg, register char *strend,
char *strbeg, I32 minend, SV *screamer, U32 nosave)
/* strend: pointer to null at end of string */
/* strbeg: real beginning of string */
/* minend: end of match must be >=minend after stringarg. */
/* nosave: For optimizations. */
{
return
regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL,
nosave ? 0 : REXEC_COPY_STR);
}
/*
- regexec_flags - match a regexp against a string
*/
I32
regexec_flags(register regexp *prog, char *stringarg, register char *strend,
char *strbeg, I32 minend, SV *screamer, void *data, U32 flags)
/* strend: pointer to null at end of string */
/* strbeg: real beginning of string */
/* minend: end of match must be >=minend after stringarg. */
/* data: May be used for some additional optimizations. */
/* nosave: For optimizations. */
{
dTHR;
register char *s;
register regnode *c;
register char *startpos = stringarg;
register I32 tmp;
I32 minlen; /* must match at least this many chars */
I32 dontbother = 0; /* how many characters not to try at end */
CURCUR cc;
I32 start_shift = 0; /* Offset of the start to find
constant substr. */
I32 end_shift = 0; /* Same for the end. */
I32 scream_pos = -1; /* Internal iterator of scream. */
char *scream_olds;
SV* oreplsv = GvSV(PL_replgv);
cc.cur = 0;
cc.oldcc = 0;
PL_regcc = &cc;
PL_regprecomp = prog->precomp; /* Needed for error messages. */
#ifdef DEBUGGING
PL_regnarrate = PL_debug & 512;
PL_regprogram = prog->program;
#endif
/* Be paranoid... */
if (prog == NULL || startpos == NULL) {
croak("NULL regexp parameter");
return 0;
}
minlen = prog->minlen;
if (strend - startpos < minlen) goto phooey;
if (startpos == strbeg) /* is ^ valid at stringarg? */
PL_regprev = '\n';
else {
PL_regprev = stringarg[-1];
if (!PL_multiline && PL_regprev == '\n')
PL_regprev = '\0'; /* force ^ to NOT match */
}
/* Check validity of program. */
if (UCHARAT(prog->program) != MAGIC) {
FAIL("corrupted regexp program");
}
PL_regnpar = prog->nparens;
PL_reg_flags = 0;
PL_reg_eval_set = 0;
/* If there is a "must appear" string, look for it. */
s = startpos;
if (!(flags & REXEC_CHECKED)
&& prog->check_substr != Nullsv &&
!(prog->reganch & ROPT_ANCH_GPOS) &&
(!(prog->reganch & (ROPT_ANCH_BOL | ROPT_ANCH_MBOL))
|| (PL_multiline && prog->check_substr == prog->anchored_substr)) )
{
start_shift = prog->check_offset_min;
/* Should be nonnegative! */
end_shift = minlen - start_shift - SvCUR(prog->check_substr);
if (screamer) {
if (PL_screamfirst[BmRARE(prog->check_substr)] >= 0)
s = screaminstr(screamer, prog->check_substr,
start_shift + (stringarg - strbeg),
end_shift, &scream_pos, 0);
else
s = Nullch;
scream_olds = s;
}
else
s = fbm_instr((unsigned char*)s + start_shift,
(unsigned char*)strend - end_shift,
prog->check_substr, 0);
if (!s) {
++BmUSEFUL(prog->check_substr); /* hooray */
goto phooey; /* not present */
} else if ((s - stringarg) > prog->check_offset_max) {
++BmUSEFUL(prog->check_substr); /* hooray/2 */
s -= prog->check_offset_max;
} else if (!prog->naughty
&& --BmUSEFUL(prog->check_substr) < 0
&& prog->check_substr == prog->float_substr) { /* boo */
SvREFCNT_dec(prog->check_substr);
prog->check_substr = Nullsv; /* disable */
prog->float_substr = Nullsv; /* clear */
s = startpos;
} else s = startpos;
}
/* Mark beginning of line for ^ and lookbehind. */
PL_regbol = startpos;
PL_bostr = strbeg;
/* Mark end of line for $ (and such) */
PL_regeol = strend;
/* see how far we have to get to not match where we matched before */
PL_regtill = startpos+minend;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"Matching `%.60s%s' against `%.*s%s'\n",
prog->precomp,
(strlen(prog->precomp) > 60 ? "..." : ""),
(strend - startpos > 60 ? 60 : strend - startpos),
startpos,
(strend - startpos > 60 ? "..." : ""))
);
/* Simplest case: anchored match need be tried only once. */
/* [unless only anchor is BOL and multiline is set] */
if (prog->reganch & ROPT_ANCH) {
if (regtry(prog, startpos))
goto got_it;
else if (!(prog->reganch & ROPT_ANCH_GPOS) &&
(PL_multiline || (prog->reganch & ROPT_IMPLICIT)
|| (prog->reganch & ROPT_ANCH_MBOL)))
{
if (minlen)
dontbother = minlen - 1;
strend -= dontbother;
/* for multiline we only have to try after newlines */
if (s > startpos)
s--;
while (s < strend) {
if (*s++ == '\n') {
if (s < strend && regtry(prog, s))
goto got_it;
}
}
}
goto phooey;
}
/* Messy cases: unanchored match. */
if (prog->anchored_substr && prog->reganch & ROPT_SKIP) {
/* we have /x+whatever/ */
/* it must be a one character string */
char ch = SvPVX(prog->anchored_substr)[0];
while (s < strend) {
if (*s == ch) {
if (regtry(prog, s)) goto got_it;
s++;
while (s < strend && *s == ch)
s++;
}
s++;
}
}
/*SUPPRESS 560*/
else if (prog->anchored_substr != Nullsv
|| (prog->float_substr != Nullsv
&& prog->float_max_offset < strend - s)) {
SV *must = prog->anchored_substr
? prog->anchored_substr : prog->float_substr;
I32 back_max =
prog->anchored_substr ? prog->anchored_offset : prog->float_max_offset;
I32 back_min =
prog->anchored_substr ? prog->anchored_offset : prog->float_min_offset;
I32 delta = back_max - back_min;
char *last = strend - SvCUR(must) - back_min; /* Cannot start after this */
char *last1 = s - 1; /* Last position checked before */
/* XXXX check_substr already used to find `s', can optimize if
check_substr==must. */
scream_pos = -1;
dontbother = end_shift;
strend -= dontbother;
while ( (s <= last) &&
(screamer
? (s = screaminstr(screamer, must, s + back_min - strbeg,
end_shift, &scream_pos, 0))
: (s = fbm_instr((unsigned char*)s + back_min,
(unsigned char*)strend, must, 0))) ) {
if (s - back_max > last1) {
last1 = s - back_min;
s = s - back_max;
} else {
char *t = last1 + 1;
last1 = s - back_min;
s = t;
}
while (s <= last1) {
if (regtry(prog, s))
goto got_it;
s++;
}
}
goto phooey;
} else if (c = prog->regstclass) {
I32 doevery = (prog->reganch & ROPT_SKIP) == 0;
char *Class;
if (minlen)
dontbother = minlen - 1;
strend -= dontbother; /* don't bother with what can't match */
tmp = 1;
/* We know what class it must start with. */
switch (OP(c)) {
case ANYOF:
Class = (char *) OPERAND(c);
while (s < strend) {
if (REGINCLASS(Class, *s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case BOUNDL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case BOUND:
if (minlen)
dontbother++,strend--;
tmp = (s != startpos) ? UCHARAT(s - 1) : PL_regprev;
tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
while (s < strend) {
if (tmp == !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) {
tmp = !tmp;
if (regtry(prog, s))
goto got_it;
}
s++;
}
if ((minlen || tmp) && regtry(prog,s))
goto got_it;
break;
case NBOUNDL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case NBOUND:
if (minlen)
dontbother++,strend--;
tmp = (s != startpos) ? UCHARAT(s - 1) : PL_regprev;
tmp = ((OP(c) == NBOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
while (s < strend) {
if (tmp == !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s)))
tmp = !tmp;
else if (regtry(prog, s))
goto got_it;
s++;
}
if ((minlen || !tmp) && regtry(prog,s))
goto got_it;
break;
case ALNUM:
while (s < strend) {
if (isALNUM(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case ALNUML:
PL_reg_flags |= RF_tainted;
while (s < strend) {
if (isALNUM_LC(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case NALNUM:
while (s < strend) {
if (!isALNUM(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case NALNUML:
PL_reg_flags |= RF_tainted;
while (s < strend) {
if (!isALNUM_LC(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case SPACE:
while (s < strend) {
if (isSPACE(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case SPACEL:
PL_reg_flags |= RF_tainted;
while (s < strend) {
if (isSPACE_LC(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case NSPACE:
while (s < strend) {
if (!isSPACE(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case NSPACEL:
PL_reg_flags |= RF_tainted;
while (s < strend) {
if (!isSPACE_LC(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case DIGIT:
while (s < strend) {
if (isDIGIT(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
case NDIGIT:
while (s < strend) {
if (!isDIGIT(*s)) {
if (tmp && regtry(prog, s))
goto got_it;
else
tmp = doevery;
}
else
tmp = 1;
s++;
}
break;
}
}
else {
dontbother = 0;
if (prog->float_substr != Nullsv) { /* Trim the end. */
char *last;
I32 oldpos = scream_pos;
if (screamer) {
last = screaminstr(screamer, prog->float_substr, s - strbeg,
end_shift, &scream_pos, 1); /* last one */
if (!last) {
last = scream_olds; /* Only one occurence. */
}
} else {
STRLEN len;
char *little = SvPV(prog->float_substr, len);
if (len)
last = rninstr(s, strend, little, little + len);
else
last = strend; /* matching `$' */
}
if (last == NULL) goto phooey; /* Should not happen! */
dontbother = strend - last + prog->float_min_offset;
}
if (minlen && (dontbother < minlen))
dontbother = minlen - 1;
strend -= dontbother;
/* We don't know much -- general case. */
do {
if (regtry(prog, s))
goto got_it;
} while (s++ < strend);
}
/* Failure. */
goto phooey;
got_it:
prog->subbeg = strbeg;
prog->subend = PL_regeol; /* strend may have been modified */
RX_MATCH_TAINTED_set(prog, PL_reg_flags & RF_tainted);
/* make sure $`, $&, $', and $digit will work later */
if (strbeg != prog->subbase) { /* second+ //g match. */
if (!(flags & REXEC_COPY_STR)) {
if (prog->subbase) {
Safefree(prog->subbase);
prog->subbase = Nullch;
}
}
else {
I32 i = PL_regeol - startpos + (stringarg - strbeg);
s = savepvn(strbeg, i);
Safefree(prog->subbase);
prog->subbase = s;
prog->subbeg = prog->subbase;
prog->subend = prog->subbase + i;
s = prog->subbase + (stringarg - strbeg);
for (i = 0; i <= prog->nparens; i++) {
if (prog->endp[i]) {
prog->startp[i] = s + (prog->startp[i] - startpos);
prog->endp[i] = s + (prog->endp[i] - startpos);
}
}
}
}
/* Preserve the current value of $^R */
if (oreplsv != GvSV(PL_replgv)) {
sv_setsv(oreplsv, GvSV(PL_replgv));/* So that when GvSV(replgv) is
restored, the value remains
the same. */
}
return 1;
phooey:
return 0;
}
/*
- regtry - try match at specific point
*/
STATIC I32 /* 0 failure, 1 success */
regtry(regexp *prog, char *startpos)
{
dTHR;
register I32 i;
register char **sp;
register char **ep;
CHECKPOINT lastcp;
if ((prog->reganch & ROPT_EVAL_SEEN) && !PL_reg_eval_set) {
PL_reg_eval_set = RS_init;
DEBUG_r(DEBUG_s(
PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %i\n",
PL_stack_sp - PL_stack_base);
));
SAVEINT(cxstack[cxstack_ix].blk_oldsp);
cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base;
/* Otherwise OP_NEXTSTATE will free whatever on stack now. */
SAVETMPS;
/* Apparently this is not needed, judging by wantarray. */
/* SAVEINT(cxstack[cxstack_ix].blk_gimme);
cxstack[cxstack_ix].blk_gimme = G_SCALAR; */
}
PL_reginput = startpos;
PL_regstartp = prog->startp;
PL_regendp = prog->endp;
PL_reglastparen = &prog->lastparen;
prog->lastparen = 0;
PL_regsize = 0;
if (PL_reg_start_tmpl <= prog->nparens) {
PL_reg_start_tmpl = prog->nparens*3/2 + 3;
if(PL_reg_start_tmp)
Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
else
New(22,PL_reg_start_tmp, PL_reg_start_tmpl, char*);
}
sp = prog->startp;
ep = prog->endp;
PL_regdata = prog->data;
if (prog->nparens) {
for (i = prog->nparens; i >= 0; i--) {
*sp++ = NULL;
*ep++ = NULL;
}
}
REGCP_SET;
if (regmatch(prog->program + 1)) {
prog->startp[0] = startpos;
prog->endp[0] = PL_reginput;
return 1;
}
REGCP_UNWIND;
return 0;
}
/*
- regmatch - main matching routine
*
* Conceptually the strategy is simple: check to see whether the current
* node matches, call self recursively to see whether the rest matches,
* and then act accordingly. In practice we make some effort to avoid
* recursion, in particular by going through "ordinary" nodes (that don't
* need to know whether the rest of the match failed) by a loop instead of
* by recursion.
*/
/* [lwall] I've hoisted the register declarations to the outer block in order to
* maybe save a little bit of pushing and popping on the stack. It also takes
* advantage of machines that use a register save mask on subroutine entry.
*/
STATIC I32 /* 0 failure, 1 success */
regmatch(regnode *prog)
{
dTHR;
register regnode *scan; /* Current node. */
regnode *next; /* Next node. */
regnode *inner; /* Next node in internal branch. */
register I32 nextchr; /* renamed nextchr - nextchar colides with
function of same name */
register I32 n; /* no or next */
register I32 ln; /* len or last */
register char *s; /* operand or save */
register char *locinput = PL_reginput;
register I32 c1, c2, paren; /* case fold search, parenth */
int minmod = 0, sw = 0, logical = 0;
#ifdef DEBUGGING
PL_regindent++;
#endif
nextchr = UCHARAT(locinput);
scan = prog;
while (scan != NULL) {
#define sayNO_L (logical ? (logical = 0, sw = 0, goto cont) : sayNO)
#ifdef DEBUGGING
# define sayYES goto yes
# define sayNO goto no
# define saySAME(x) if (x) goto yes; else goto no
# define REPORT_CODE_OFF 24
#else
# define sayYES return 1
# define sayNO return 0
# define saySAME(x) return x
#endif
DEBUG_r( {
SV *prop = sv_newmortal();
int docolor = *PL_colors[0];
int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
int l = (PL_regeol - locinput > taill ? taill : PL_regeol - locinput);
int pref_len = (locinput - PL_bostr > (5 + taill) - l
? (5 + taill) - l : locinput - PL_bostr);
if (l + pref_len < (5 + taill) && l < PL_regeol - locinput)
l = ( PL_regeol - locinput > (5 + taill) - pref_len
? (5 + taill) - pref_len : PL_regeol - locinput);
regprop(prop, scan);
PerlIO_printf(Perl_debug_log,
"%4i <%s%.*s%s%s%s%.*s%s>%*s|%3d:%*s%s\n",
locinput - PL_bostr,
PL_colors[2], pref_len, locinput - pref_len, PL_colors[3],
(docolor ? "" : "> <"),
PL_colors[0], l, locinput, PL_colors[1],
15 - l - pref_len + 1,
"",
scan - PL_regprogram, PL_regindent*2, "",
SvPVX(prop));
} );
next = scan + NEXT_OFF(scan);
if (next == scan)
next = NULL;
switch (OP(scan)) {
case BOL:
if (locinput == PL_bostr
? PL_regprev == '\n'
: (PL_multiline &&
(nextchr || locinput < PL_regeol) && locinput[-1] == '\n') )
{
/* PL_regtill = PL_regbol; */
break;
}
sayNO;
case MBOL:
if (locinput == PL_bostr
? PL_regprev == '\n'
: ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n') )
{
break;
}
sayNO;
case SBOL:
if (locinput == PL_regbol && PL_regprev == '\n')
break;
sayNO;
case GPOS:
if (locinput == PL_regbol)
break;
sayNO;
case EOL:
if (PL_multiline)
goto meol;
else
goto seol;
case MEOL:
meol:
if ((nextchr || locinput < PL_regeol) && nextchr != '\n')
sayNO;
break;
case SEOL:
seol:
if ((nextchr || locinput < PL_regeol) && nextchr != '\n')
sayNO;
if (PL_regeol - locinput > 1)
sayNO;
break;
case EOS:
if (PL_regeol != locinput)
sayNO;
break;
case SANY:
if (!nextchr && locinput >= PL_regeol)
sayNO;
nextchr = UCHARAT(++locinput);
break;
case ANY:
if (!nextchr && locinput >= PL_regeol || nextchr == '\n')
sayNO;
nextchr = UCHARAT(++locinput);
break;
case EXACT:
s = (char *) OPERAND(scan);
ln = UCHARAT(s++);
/* Inline the first character, for speed. */
if (UCHARAT(s) != nextchr)
sayNO;
if (PL_regeol - locinput < ln)
sayNO;
if (ln > 1 && memNE(s, locinput, ln))
sayNO;
locinput += ln;
nextchr = UCHARAT(locinput);
break;
case EXACTFL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case EXACTF:
s = (char *) OPERAND(scan);
ln = UCHARAT(s++);
/* Inline the first character, for speed. */
if (UCHARAT(s) != nextchr &&
UCHARAT(s) != ((OP(scan) == EXACTF)
? fold : fold_locale)[nextchr])
sayNO;
if (PL_regeol - locinput < ln)
sayNO;
if (ln > 1 && (OP(scan) == EXACTF
? ibcmp(s, locinput, ln)
: ibcmp_locale(s, locinput, ln)))
sayNO;
locinput += ln;
nextchr = UCHARAT(locinput);
break;
case ANYOF:
s = (char *) OPERAND(scan);
if (nextchr < 0)
nextchr = UCHARAT(locinput);
if (!REGINCLASS(s, nextchr))
sayNO;
if (!nextchr && locinput >= PL_regeol)
sayNO;
nextchr = UCHARAT(++locinput);
break;
case ALNUML:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case ALNUM:
if (!nextchr)
sayNO;
if (!(OP(scan) == ALNUM
? isALNUM(nextchr) : isALNUM_LC(nextchr)))
sayNO;
nextchr = UCHARAT(++locinput);
break;
case NALNUML:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case NALNUM:
if (!nextchr && locinput >= PL_regeol)
sayNO;
if (OP(scan) == NALNUM
? isALNUM(nextchr) : isALNUM_LC(nextchr))
sayNO;
nextchr = UCHARAT(++locinput);
break;
case BOUNDL:
case NBOUNDL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case BOUND:
case NBOUND:
/* was last char in word? */
ln = (locinput != PL_regbol) ? UCHARAT(locinput - 1) : PL_regprev;
if (OP(scan) == BOUND || OP(scan) == NBOUND) {
ln = isALNUM(ln);
n = isALNUM(nextchr);
}
else {
ln = isALNUM_LC(ln);
n = isALNUM_LC(nextchr);
}
if (((!ln) == (!n)) == (OP(scan) == BOUND || OP(scan) == BOUNDL))
sayNO;
break;
case SPACEL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case SPACE:
if (!nextchr && locinput >= PL_regeol)
sayNO;
if (!(OP(scan) == SPACE
? isSPACE(nextchr) : isSPACE_LC(nextchr)))
sayNO;
nextchr = UCHARAT(++locinput);
break;
case NSPACEL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case NSPACE:
if (!nextchr)
sayNO;
if (OP(scan) == SPACE
? isSPACE(nextchr) : isSPACE_LC(nextchr))
sayNO;
nextchr = UCHARAT(++locinput);
break;
case DIGIT:
if (!isDIGIT(nextchr))
sayNO;
nextchr = UCHARAT(++locinput);
break;
case NDIGIT:
if (!nextchr && locinput >= PL_regeol)
sayNO;
if (isDIGIT(nextchr))
sayNO;
nextchr = UCHARAT(++locinput);
break;
case REFFL:
PL_reg_flags |= RF_tainted;
/* FALL THROUGH */
case REF:
case REFF:
n = ARG(scan); /* which paren pair */
s = PL_regstartp[n];
if (*PL_reglastparen < n || !s)
sayNO; /* Do not match unless seen CLOSEn. */
if (s == PL_regendp[n])
break;
/* Inline the first character, for speed. */
if (UCHARAT(s) != nextchr &&
(OP(scan) == REF ||
(UCHARAT(s) != ((OP(scan) == REFF
? fold : fold_locale)[nextchr]))))
sayNO;
ln = PL_regendp[n] - s;
if (locinput + ln > PL_regeol)
sayNO;
if (ln > 1 && (OP(scan) == REF
? memNE(s, locinput, ln)
: (OP(scan) == REFF
? ibcmp(s, locinput, ln)
: ibcmp_locale(s, locinput, ln))))
sayNO;
locinput += ln;
nextchr = UCHARAT(locinput);
break;
case NOTHING:
case TAIL:
break;
case BACK:
break;
case EVAL:
{
dSP;
OP_4tree *oop = PL_op;
COP *ocurcop = PL_curcop;
SV **ocurpad = PL_curpad;
SV *ret;
n = ARG(scan);
PL_op = (OP_4tree*)PL_regdata->data[n];
DEBUG_r( PerlIO_printf(Perl_debug_log, " re_eval 0x%x\n", PL_op) );
PL_curpad = AvARRAY((AV*)PL_regdata->data[n + 1]);
CALLRUNOPS(); /* Scalar context. */
SPAGAIN;
ret = POPs;
PUTBACK;
if (logical) {
logical = 0;
sw = SvTRUE(ret);
} else
sv_setsv(save_scalar(PL_replgv), ret);
PL_op = oop;
PL_curpad = ocurpad;
PL_curcop = ocurcop;
break;
}
case OPEN:
n = ARG(scan); /* which paren pair */
PL_reg_start_tmp[n] = locinput;
if (n > PL_regsize)
PL_regsize = n;
break;
case CLOSE:
n = ARG(scan); /* which paren pair */
PL_regstartp[n] = PL_reg_start_tmp[n];
PL_regendp[n] = locinput;
if (n > *PL_reglastparen)
*PL_reglastparen = n;
break;
case GROUPP:
n = ARG(scan); /* which paren pair */
sw = (*PL_reglastparen >= n && PL_regendp[n] != NULL);
break;
case IFTHEN:
if (sw)
next = NEXTOPER(NEXTOPER(scan));
else {
next = scan + ARG(scan);
if (OP(next) == IFTHEN) /* Fake one. */
next = NEXTOPER(NEXTOPER(next));
}
break;
case LOGICAL:
logical = 1;
break;
case CURLYX: {
CURCUR cc;
CHECKPOINT cp = PL_savestack_ix;
if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */
next += ARG(next);
cc.oldcc = PL_regcc;
PL_regcc = &cc;
cc.parenfloor = *PL_reglastparen;
cc.cur = -1;
cc.min = ARG1(scan);
cc.max = ARG2(scan);
cc.scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS;
cc.next = next;
cc.minmod = minmod;
cc.lastloc = 0;
PL_reginput = locinput;
n = regmatch(PREVOPER(next)); /* start on the WHILEM */
regcpblow(cp);
PL_regcc = cc.oldcc;
saySAME(n);
}
/* NOT REACHED */
case WHILEM: {
/*
* This is really hard to understand, because after we match
* what we're trying to match, we must make sure the rest of
* the RE is going to match for sure, and to do that we have
* to go back UP the parse tree by recursing ever deeper. And
* if it fails, we have to reset our parent's current state
* that we can try again after backing off.
*/
CHECKPOINT cp, lastcp;
CURCUR* cc = PL_regcc;
char *lastloc = cc->lastloc; /* Detection of 0-len. */
n = cc->cur + 1; /* how many we know we matched */
PL_reginput = locinput;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s %ld out of %ld..%ld cc=%lx\n",
REPORT_CODE_OFF+PL_regindent*2, "",
(long)n, (long)cc->min,
(long)cc->max, (long)cc)
);
/* If degenerate scan matches "", assume scan done. */
if (locinput == cc->lastloc && n >= cc->min) {
PL_regcc = cc->oldcc;
ln = PL_regcc->cur;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s empty match detected, try continuation...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
if (regmatch(cc->next))
sayYES;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s failed...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
PL_regcc->cur = ln;
PL_regcc = cc;
sayNO;
}
/* First just match a string of min scans. */
if (n < cc->min) {
cc->cur = n;
cc->lastloc = locinput;
if (regmatch(cc->scan))
sayYES;
cc->cur = n - 1;
cc->lastloc = lastloc;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s failed...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
sayNO;
}
/* Prefer next over scan for minimal matching. */
if (cc->minmod) {
PL_regcc = cc->oldcc;
ln = PL_regcc->cur;
cp = regcppush(cc->parenfloor);
REGCP_SET;
if (regmatch(cc->next)) {
regcpblow(cp);
sayYES; /* All done. */
}
REGCP_UNWIND;
regcppop();
PL_regcc->cur = ln;
PL_regcc = cc;
if (n >= cc->max) { /* Maximum greed exceeded? */
if (PL_dowarn && n >= REG_INFTY
&& !(PL_reg_flags & RF_warned)) {
PL_reg_flags |= RF_warned;
warn("%s limit (%d) exceeded",
"Complex regular subexpression recursion",
REG_INFTY - 1);
}
sayNO;
}
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s trying longer...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
/* Try scanning more and see if it helps. */
PL_reginput = locinput;
cc->cur = n;
cc->lastloc = locinput;
cp = regcppush(cc->parenfloor);
REGCP_SET;
if (regmatch(cc->scan)) {
regcpblow(cp);
sayYES;
}
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s failed...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
REGCP_UNWIND;
regcppop();
cc->cur = n - 1;
cc->lastloc = lastloc;
sayNO;
}
/* Prefer scan over next for maximal matching. */
if (n < cc->max) { /* More greed allowed? */
cp = regcppush(cc->parenfloor);
cc->cur = n;
cc->lastloc = locinput;
REGCP_SET;
if (regmatch(cc->scan)) {
regcpblow(cp);
sayYES;
}
REGCP_UNWIND;
regcppop(); /* Restore some previous $<digit>s? */
PL_reginput = locinput;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s failed, try continuation...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
}
if (PL_dowarn && n >= REG_INFTY && !(PL_reg_flags & RF_warned)) {
PL_reg_flags |= RF_warned;
warn("%s limit (%d) exceeded",
"Complex regular subexpression recursion",
REG_INFTY - 1);
}
/* Failed deeper matches of scan, so see if this one works. */
PL_regcc = cc->oldcc;
ln = PL_regcc->cur;
if (regmatch(cc->next))
sayYES;
DEBUG_r(
PerlIO_printf(Perl_debug_log, "%*s failed...\n",
REPORT_CODE_OFF+PL_regindent*2, "")
);
PL_regcc->cur = ln;
PL_regcc = cc;
cc->cur = n - 1;
cc->lastloc = lastloc;
sayNO;
}
/* NOT REACHED */
case BRANCHJ:
next = scan + ARG(scan);
if (next == scan)
next = NULL;
inner = NEXTOPER(NEXTOPER(scan));
goto do_branch;
case BRANCH:
inner = NEXTOPER(scan);
do_branch:
{
CHECKPOINT lastcp;
c1 = OP(scan);
if (OP(next) != c1) /* No choice. */
next = inner; /* Avoid recursion. */
else {
int lastparen = *PL_reglastparen;
REGCP_SET;
do {
PL_reginput = locinput;
if (regmatch(inner))
sayYES;
REGCP_UNWIND;
for (n = *PL_reglastparen; n > lastparen; n--)
PL_regendp[n] = 0;
*PL_reglastparen = n;
scan = next;
/*SUPPRESS 560*/
if (n = (c1 == BRANCH ? NEXT_OFF(next) : ARG(next)))
next += n;
else
next = NULL;
inner = NEXTOPER(scan);
if (c1 == BRANCHJ) {
inner = NEXTOPER(inner);
}
} while (scan != NULL && OP(scan) == c1);
sayNO;
/* NOTREACHED */
}
}
break;
case MINMOD:
minmod = 1;
break;
case CURLYM:
{
I32 l = 0;
CHECKPOINT lastcp;
/* We suppose that the next guy does not need
backtracking: in particular, it is of constant length,
and has no parenths to influence future backrefs. */
ln = ARG1(scan); /* min to match */
n = ARG2(scan); /* max to match */
paren = scan->flags;
if (paren) {
if (paren > PL_regsize)
PL_regsize = paren;
if (paren > *PL_reglastparen)
*PL_reglastparen = paren;
}
scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
if (paren)
scan += NEXT_OFF(scan); /* Skip former OPEN. */
PL_reginput = locinput;
if (minmod) {
minmod = 0;
if (ln && regrepeat_hard(scan, ln, &l) < ln)
sayNO;
if (ln && l == 0 && n >= ln
/* In fact, this is tricky. If paren, then the
fact that we did/didnot match may influence
future execution. */
&& !(paren && ln == 0))
ln = n;
locinput = PL_reginput;
if (regkind[(U8)OP(next)] == EXACT) {
c1 = UCHARAT(OPERAND(next) + 1);
if (OP(next) == EXACTF)
c2 = fold[c1];
else if (OP(next) == EXACTFL)
c2 = fold_locale[c1];
else
c2 = c1;
} else
c1 = c2 = -1000;
REGCP_SET;
/* This may be improved if l == 0. */
while (n >= ln || (n == REG_INFTY && ln > 0 && l)) { /* ln overflow ? */
/* If it could work, try it. */
if (c1 == -1000 ||
UCHARAT(PL_reginput) == c1 ||
UCHARAT(PL_reginput) == c2)
{
if (paren) {
if (n) {
PL_regstartp[paren] = PL_reginput - l;
PL_regendp[paren] = PL_reginput;
} else
PL_regendp[paren] = NULL;
}
if (regmatch(next))
sayYES;
REGCP_UNWIND;
}
/* Couldn't or didn't -- move forward. */
PL_reginput = locinput;
if (regrepeat_hard(scan, 1, &l)) {
ln++;
locinput = PL_reginput;
}
else
sayNO;
}
} else {
n = regrepeat_hard(scan, n, &l);
if (n != 0 && l == 0
/* In fact, this is tricky. If paren, then the
fact that we did/didnot match may influence
future execution. */
&& !(paren && ln == 0))
ln = n;
locinput = PL_reginput;
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s matched %ld times, len=%ld...\n",
REPORT_CODE_OFF+PL_regindent*2, "", n, l)
);
if (n >= ln) {
if (regkind[(U8)OP(next)] == EXACT) {
c1 = UCHARAT(OPERAND(next) + 1);
if (OP(next) == EXACTF)
c2 = fold[c1];
else if (OP(next) == EXACTFL)
c2 = fold_locale[c1];
else
c2 = c1;
} else
c1 = c2 = -1000;
}
REGCP_SET;
while (n >= ln) {
/* If it could work, try it. */
if (c1 == -1000 ||
UCHARAT(PL_reginput) == c1 ||
UCHARAT(PL_reginput) == c2)
{
DEBUG_r(
PerlIO_printf(Perl_debug_log,
"%*s trying tail with n=%ld...\n",
REPORT_CODE_OFF+PL_regindent*2, "", n)
);
if (paren) {
if (n) {
PL_regstartp[paren] = PL_reginput - l;
PL_regendp[paren] = PL_reginput;
} else
PL_regendp[paren] = NULL;
}
if (regmatch(next))
sayYES;
REGCP_UNWIND;
}
/* Couldn't or didn't -- back up. */
n--;
locinput -= l;
PL_reginput = locinput;
}
}
sayNO;
break;
}
case CURLYN:
paren = scan->flags; /* Which paren to set */
if (paren > PL_regsize)
PL_regsize = paren;
if (paren > *PL_reglastparen)
*PL_reglastparen = paren;
ln = ARG1(scan); /* min to match */
n = ARG2(scan); /* max to match */
scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE);
goto repeat;
case CURLY:
paren = 0;
ln = ARG1(scan); /* min to match */
n = ARG2(scan); /* max to match */
scan = NEXTOPER(scan) + NODE_STEP_REGNODE;
goto repeat;
case STAR:
ln = 0;
n = REG_INFTY;
scan = NEXTOPER(scan);
paren = 0;
goto repeat;
case PLUS:
ln = 1;
n = REG_INFTY;
scan = NEXTOPER(scan);
paren = 0;
repeat:
/*
* Lookahead to avoid useless match attempts
* when we know what character comes next.
*/
if (regkind[(U8)OP(next)] == EXACT) {
c1 = UCHARAT(OPERAND(next) + 1);
if (OP(next) == EXACTF)
c2 = fold[c1];
else if (OP(next) == EXACTFL)
c2 = fold_locale[c1];
else
c2 = c1;
}
else
c1 = c2 = -1000;
PL_reginput = locinput;
if (minmod) {
CHECKPOINT lastcp;
minmod = 0;
if (ln && regrepeat(scan, ln) < ln)
sayNO;
REGCP_SET;
while (n >= ln || (n == REG_INFTY && ln > 0)) { /* ln overflow ? */
/* If it could work, try it. */
if (c1 == -1000 ||
UCHARAT(PL_reginput) == c1 ||
UCHARAT(PL_reginput) == c2)
{
if (paren) {
if (n) {
PL_regstartp[paren] = PL_reginput - 1;
PL_regendp[paren] = PL_reginput;
} else
PL_regendp[paren] = NULL;
}
if (regmatch(next))
sayYES;
REGCP_UNWIND;
}
/* Couldn't or didn't -- move forward. */
PL_reginput = locinput + ln;
if (regrepeat(scan, 1)) {
ln++;
PL_reginput = locinput + ln;
} else
sayNO;
}
}
else {
CHECKPOINT lastcp;
n = regrepeat(scan, n);
if (ln < n && regkind[(U8)OP(next)] == EOL &&
(!PL_multiline || OP(next) == SEOL))
ln = n; /* why back off? */
REGCP_SET;
if (paren) {
while (n >= ln) {
/* If it could work, try it. */
if (c1 == -1000 ||
UCHARAT(PL_reginput) == c1 ||
UCHARAT(PL_reginput) == c2)
{
if (paren && n) {
if (n) {
PL_regstartp[paren] = PL_reginput - 1;
PL_regendp[paren] = PL_reginput;
} else
PL_regendp[paren] = NULL;
}
if (regmatch(next))
sayYES;
REGCP_UNWIND;
}
/* Couldn't or didn't -- back up. */
n--;
PL_reginput = locinput + n;
}
} else {
while (n >= ln) {
/* If it could work, try it. */
if (c1 == -1000 ||
UCHARAT(PL_reginput) == c1 ||
UCHARAT(PL_reginput) == c2)
{
if (regmatch(next))
sayYES;
REGCP_UNWIND;
}
/* Couldn't or didn't -- back up. */
n--;
PL_reginput = locinput + n;
}
}
}
sayNO;
break;
case END:
if (locinput < PL_regtill)
sayNO; /* Cannot match: too short. */
/* Fall through */
case SUCCEED:
PL_reginput = locinput; /* put where regtry can find it */
sayYES; /* Success! */
case SUSPEND:
n = 1;
goto do_ifmatch;
case UNLESSM:
n = 0;
if (locinput < PL_bostr + scan->flags)
goto say_yes;
goto do_ifmatch;
case IFMATCH:
n = 1;
if (locinput < PL_bostr + scan->flags)
goto say_no;
do_ifmatch:
PL_reginput = locinput - scan->flags;
inner = NEXTOPER(NEXTOPER(scan));
if (regmatch(inner) != n) {
say_no:
if (logical) {
logical = 0;
sw = 0;
goto do_longjump;
} else
sayNO;
}
say_yes:
if (logical) {
logical = 0;
sw = 1;
}
if (OP(scan) == SUSPEND) {
locinput = PL_reginput;
nextchr = UCHARAT(locinput);
}
/* FALL THROUGH. */
case LONGJMP:
do_longjump:
next = scan + ARG(scan);
if (next == scan)
next = NULL;
break;
default:
PerlIO_printf(PerlIO_stderr(), "%lx %d\n",
(unsigned long)scan, OP(scan));
FAIL("regexp memory corruption");
}
scan = next;
}
/*
* We get here only if there's trouble -- normally "case END" is
* the terminating point.
*/
FAIL("corrupted regexp pointers");
/*NOTREACHED*/
sayNO;
yes:
#ifdef DEBUGGING
PL_regindent--;
#endif
return 1;
no:
#ifdef DEBUGGING
PL_regindent--;
#endif
return 0;
}
/*
- regrepeat - repeatedly match something simple, report how many
*/
/*
* [This routine now assumes that it will only match on things of length 1.
* That was true before, but now we assume scan - reginput is the count,
* rather than incrementing count on every character.]
*/
STATIC I32
regrepeat(regnode *p, I32 max)
{
dTHR;
register char *scan;
register char *opnd;
register I32 c;
register char *loceol = PL_regeol;
scan = PL_reginput;
if (max != REG_INFTY && max < loceol - scan)
loceol = scan + max;
opnd = (char *) OPERAND(p);
switch (OP(p)) {
case ANY:
while (scan < loceol && *scan != '\n')
scan++;
break;
case SANY:
scan = loceol;
break;
case EXACT: /* length of string is 1 */
c = UCHARAT(++opnd);
while (scan < loceol && UCHARAT(scan) == c)
scan++;
break;
case EXACTF: /* length of string is 1 */
c = UCHARAT(++opnd);
while (scan < loceol &&
(UCHARAT(scan) == c || UCHARAT(scan) == fold[c]))
scan++;
break;
case EXACTFL: /* length of string is 1 */
PL_reg_flags |= RF_tainted;
c = UCHARAT(++opnd);
while (scan < loceol &&
(UCHARAT(scan) == c || UCHARAT(scan) == fold_locale[c]))
scan++;
break;
case ANYOF:
while (scan < loceol && REGINCLASS(opnd, *scan))
scan++;
break;
case ALNUM:
while (scan < loceol && isALNUM(*scan))
scan++;
break;
case ALNUML:
PL_reg_flags |= RF_tainted;
while (scan < loceol && isALNUM_LC(*scan))
scan++;
break;
case NALNUM:
while (scan < loceol && !isALNUM(*scan))
scan++;
break;
case NALNUML:
PL_reg_flags |= RF_tainted;
while (scan < loceol && !isALNUM_LC(*scan))
scan++;
break;
case SPACE:
while (scan < loceol && isSPACE(*scan))
scan++;
break;
case SPACEL:
PL_reg_flags |= RF_tainted;
while (scan < loceol && isSPACE_LC(*scan))
scan++;
break;
case NSPACE:
while (scan < loceol && !isSPACE(*scan))
scan++;
break;
case NSPACEL:
PL_reg_flags |= RF_tainted;
while (scan < loceol && !isSPACE_LC(*scan))
scan++;
break;
case DIGIT:
while (scan < loceol && isDIGIT(*scan))
scan++;
break;
case NDIGIT:
while (scan < loceol && !isDIGIT(*scan))
scan++;
break;
default: /* Called on something of 0 width. */
break; /* So match right here or not at all. */
}
c = scan - PL_reginput;
PL_reginput = scan;
DEBUG_r(
{
SV *prop = sv_newmortal();
regprop(prop, p);
PerlIO_printf(Perl_debug_log,
"%*s %s can match %ld times out of %ld...\n",
REPORT_CODE_OFF+1, "", SvPVX(prop),c,max);
});
return(c);
}
/*
- regrepeat_hard - repeatedly match something, report total lenth and length
*
* The repeater is supposed to have constant length.
*/
STATIC I32
regrepeat_hard(regnode *p, I32 max, I32 *lp)
{
dTHR;
register char *scan;
register char *start;
register char *loceol = PL_regeol;
I32 l = -1;
start = PL_reginput;
while (PL_reginput < loceol && (scan = PL_reginput, regmatch(p))) {
if (l == -1) {
*lp = l = PL_reginput - start;
if (max != REG_INFTY && l*max < loceol - scan)
loceol = scan + l*max;
if (l == 0) {
return max;
}
}
}
if (PL_reginput < loceol)
PL_reginput = scan;
else
scan = PL_reginput;
return (scan - start)/l;
}
/*
- regclass - determine if a character falls into a character class
*/
STATIC bool
reginclass(register char *p, register I32 c)
{
dTHR;
char flags = *p;
bool match = FALSE;
c &= 0xFF;
if (ANYOF_TEST(p, c))
match = TRUE;
else if (flags & ANYOF_FOLD) {
I32 cf;
if (flags & ANYOF_LOCALE) {
PL_reg_flags |= RF_tainted;
cf = fold_locale[c];
}
else
cf = fold[c];
if (ANYOF_TEST(p, cf))
match = TRUE;
}
if (!match && (flags & ANYOF_ISA)) {
PL_reg_flags |= RF_tainted;
if (((flags & ANYOF_ALNUML) && isALNUM_LC(c)) ||
((flags & ANYOF_NALNUML) && !isALNUM_LC(c)) ||
((flags & ANYOF_SPACEL) && isSPACE_LC(c)) ||
((flags & ANYOF_NSPACEL) && !isSPACE_LC(c)))
{
match = TRUE;
}
}
return (flags & ANYOF_INVERT) ? !match : match;
}
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