Commit | Line | Data |
a0d0e21e |
1 | /* regexec.c |
2 | */ |
3 | |
4 | /* |
5 | * "One Ring to rule them all, One Ring to find them..." |
6 | */ |
7 | |
a687059c |
8 | /* NOTE: this is derived from Henry Spencer's regexp code, and should not |
9 | * confused with the original package (see point 3 below). Thanks, Henry! |
10 | */ |
11 | |
12 | /* Additional note: this code is very heavily munged from Henry's version |
13 | * in places. In some spots I've traded clarity for efficiency, so don't |
14 | * blame Henry for some of the lack of readability. |
15 | */ |
16 | |
e50aee73 |
17 | /* The names of the functions have been changed from regcomp and |
18 | * regexec to pregcomp and pregexec in order to avoid conflicts |
19 | * with the POSIX routines of the same names. |
20 | */ |
21 | |
f0fcb552 |
22 | /*SUPPRESS 112*/ |
a687059c |
23 | /* |
e50aee73 |
24 | * pregcomp and pregexec -- regsub and regerror are not used in perl |
a687059c |
25 | * |
26 | * Copyright (c) 1986 by University of Toronto. |
27 | * Written by Henry Spencer. Not derived from licensed software. |
28 | * |
29 | * Permission is granted to anyone to use this software for any |
30 | * purpose on any computer system, and to redistribute it freely, |
31 | * subject to the following restrictions: |
32 | * |
33 | * 1. The author is not responsible for the consequences of use of |
34 | * this software, no matter how awful, even if they arise |
35 | * from defects in it. |
36 | * |
37 | * 2. The origin of this software must not be misrepresented, either |
38 | * by explicit claim or by omission. |
39 | * |
40 | * 3. Altered versions must be plainly marked as such, and must not |
41 | * be misrepresented as being the original software. |
42 | * |
43 | **** Alterations to Henry's code are... |
44 | **** |
9607fc9c |
45 | **** Copyright (c) 1991-1997, Larry Wall |
a687059c |
46 | **** |
9ef589d8 |
47 | **** You may distribute under the terms of either the GNU General Public |
48 | **** License or the Artistic License, as specified in the README file. |
a687059c |
49 | * |
50 | * Beware that some of this code is subtly aware of the way operator |
51 | * precedence is structured in regular expressions. Serious changes in |
52 | * regular-expression syntax might require a total rethink. |
53 | */ |
54 | #include "EXTERN.h" |
55 | #include "perl.h" |
56 | #include "regcomp.h" |
57 | |
58 | #ifndef STATIC |
59 | #define STATIC static |
60 | #endif |
61 | |
62 | #ifdef DEBUGGING |
a0d0e21e |
63 | static I32 regnarrate = 0; |
64 | static char* regprogram = 0; |
a687059c |
65 | #endif |
66 | |
a0d0e21e |
67 | /* Current curly descriptor */ |
68 | typedef struct curcur CURCUR; |
69 | struct curcur { |
70 | int parenfloor; /* how far back to strip paren data */ |
71 | int cur; /* how many instances of scan we've matched */ |
72 | int min; /* the minimal number of scans to match */ |
73 | int max; /* the maximal number of scans to match */ |
74 | int minmod; /* whether to work our way up or down */ |
75 | char * scan; /* the thing to match */ |
76 | char * next; /* what has to match after it */ |
77 | char * lastloc; /* where we started matching this scan */ |
78 | CURCUR * oldcc; /* current curly before we started this one */ |
79 | }; |
80 | |
81 | static CURCUR* regcc; |
82 | |
83 | typedef I32 CHECKPOINT; |
84 | |
55497cff |
85 | static CHECKPOINT regcppush _((I32 parenfloor)); |
86 | static char * regcppop _((void)); |
a0d0e21e |
87 | |
55497cff |
88 | static CHECKPOINT |
a0d0e21e |
89 | regcppush(parenfloor) |
90 | I32 parenfloor; |
91 | { |
11343788 |
92 | dTHR; |
a0d0e21e |
93 | int retval = savestack_ix; |
94 | int i = (regsize - parenfloor) * 3; |
95 | int p; |
96 | |
97 | SSCHECK(i + 5); |
98 | for (p = regsize; p > parenfloor; p--) { |
99 | SSPUSHPTR(regendp[p]); |
100 | SSPUSHPTR(regstartp[p]); |
101 | SSPUSHINT(p); |
102 | } |
103 | SSPUSHINT(regsize); |
104 | SSPUSHINT(*reglastparen); |
105 | SSPUSHPTR(reginput); |
106 | SSPUSHINT(i + 3); |
107 | SSPUSHINT(SAVEt_REGCONTEXT); |
108 | return retval; |
109 | } |
110 | |
55497cff |
111 | static char * |
a0d0e21e |
112 | regcppop() |
113 | { |
11343788 |
114 | dTHR; |
a0d0e21e |
115 | I32 i = SSPOPINT; |
116 | U32 paren = 0; |
117 | char *input; |
118 | char *tmps; |
119 | assert(i == SAVEt_REGCONTEXT); |
120 | i = SSPOPINT; |
121 | input = (char *) SSPOPPTR; |
122 | *reglastparen = SSPOPINT; |
123 | regsize = SSPOPINT; |
124 | for (i -= 3; i > 0; i -= 3) { |
125 | paren = (U32)SSPOPINT; |
126 | regstartp[paren] = (char *) SSPOPPTR; |
127 | tmps = (char*)SSPOPPTR; |
128 | if (paren <= *reglastparen) |
129 | regendp[paren] = tmps; |
130 | } |
131 | for (paren = *reglastparen + 1; paren <= regnpar; paren++) { |
132 | if (paren > regsize) |
133 | regstartp[paren] = Nullch; |
134 | regendp[paren] = Nullch; |
135 | } |
136 | return input; |
137 | } |
138 | |
139 | #define regcpblow(cp) leave_scope(cp) |
140 | |
a687059c |
141 | /* |
e50aee73 |
142 | * pregexec and friends |
a687059c |
143 | */ |
144 | |
145 | /* |
a687059c |
146 | * Forwards. |
147 | */ |
a0d0e21e |
148 | |
149 | static I32 regmatch _((char *prog)); |
150 | static I32 regrepeat _((char *p, I32 max)); |
151 | static I32 regtry _((regexp *prog, char *startpos)); |
bbce6d69 |
152 | static bool reginclass _((char *p, I32 c)); |
153 | |
154 | static bool regtainted; /* tainted information used? */ |
a687059c |
155 | |
156 | /* |
e50aee73 |
157 | - pregexec - match a regexp against a string |
a687059c |
158 | */ |
79072805 |
159 | I32 |
e50aee73 |
160 | pregexec(prog, stringarg, strend, strbeg, minend, screamer, safebase) |
a687059c |
161 | register regexp *prog; |
162 | char *stringarg; |
163 | register char *strend; /* pointer to null at end of string */ |
164 | char *strbeg; /* real beginning of string */ |
79072805 |
165 | I32 minend; /* end of match must be at least minend after stringarg */ |
166 | SV *screamer; |
167 | I32 safebase; /* no need to remember string in subbase */ |
a687059c |
168 | { |
a0d0e21e |
169 | register char *s; |
a0d0e21e |
170 | register char *c; |
171 | register char *startpos = stringarg; |
172 | register I32 tmp; |
173 | I32 minlen = 0; /* must match at least this many chars */ |
174 | I32 dontbother = 0; /* how many characters not to try at end */ |
175 | CURCUR cc; |
a687059c |
176 | |
a0d0e21e |
177 | cc.cur = 0; |
4633a7c4 |
178 | cc.oldcc = 0; |
a0d0e21e |
179 | regcc = &cc; |
180 | |
181 | #ifdef DEBUGGING |
182 | regnarrate = debug & 512; |
183 | regprogram = prog->program; |
184 | #endif |
185 | |
186 | /* Be paranoid... */ |
187 | if (prog == NULL || startpos == NULL) { |
188 | croak("NULL regexp parameter"); |
189 | return 0; |
190 | } |
191 | |
192 | if (startpos == strbeg) /* is ^ valid at stringarg? */ |
193 | regprev = '\n'; |
194 | else { |
195 | regprev = stringarg[-1]; |
196 | if (!multiline && regprev == '\n') |
197 | regprev = '\0'; /* force ^ to NOT match */ |
198 | } |
bbce6d69 |
199 | |
a0d0e21e |
200 | regprecomp = prog->precomp; |
a0d0e21e |
201 | /* Check validity of program. */ |
202 | if (UCHARAT(prog->program) != MAGIC) { |
203 | FAIL("corrupted regexp program"); |
204 | } |
205 | |
bbce6d69 |
206 | regnpar = prog->nparens; |
207 | regtainted = FALSE; |
a0d0e21e |
208 | |
209 | /* If there is a "must appear" string, look for it. */ |
210 | s = startpos; |
211 | if (prog->regmust != Nullsv && |
774d564b |
212 | !(prog->reganch & ROPT_ANCH_GPOS) && |
213 | (!(prog->reganch & ROPT_ANCH_BOL) |
a0d0e21e |
214 | || (multiline && prog->regback >= 0)) ) |
215 | { |
216 | if (stringarg == strbeg && screamer) { |
217 | if (screamfirst[BmRARE(prog->regmust)] >= 0) |
218 | s = screaminstr(screamer,prog->regmust); |
219 | else |
220 | s = Nullch; |
0a12ae7d |
221 | } |
a0d0e21e |
222 | else |
223 | s = fbm_instr((unsigned char*)s, (unsigned char*)strend, |
224 | prog->regmust); |
225 | if (!s) { |
226 | ++BmUSEFUL(prog->regmust); /* hooray */ |
227 | goto phooey; /* not present */ |
a687059c |
228 | } |
a0d0e21e |
229 | else if (prog->regback >= 0) { |
230 | s -= prog->regback; |
231 | if (s < startpos) |
232 | s = startpos; |
233 | minlen = prog->regback + SvCUR(prog->regmust); |
a687059c |
234 | } |
a0d0e21e |
235 | else if (!prog->naughty && --BmUSEFUL(prog->regmust) < 0) { /* boo */ |
236 | SvREFCNT_dec(prog->regmust); |
237 | prog->regmust = Nullsv; /* disable regmust */ |
238 | s = startpos; |
239 | } |
240 | else { |
241 | s = startpos; |
242 | minlen = SvCUR(prog->regmust); |
a687059c |
243 | } |
a0d0e21e |
244 | } |
a687059c |
245 | |
a0d0e21e |
246 | /* Mark beginning of line for ^ . */ |
247 | regbol = startpos; |
a687059c |
248 | |
a0d0e21e |
249 | /* Mark end of line for $ (and such) */ |
250 | regeol = strend; |
a687059c |
251 | |
a0d0e21e |
252 | /* see how far we have to get to not match where we matched before */ |
253 | regtill = startpos+minend; |
a687059c |
254 | |
a0d0e21e |
255 | /* Simplest case: anchored match need be tried only once. */ |
774d564b |
256 | /* [unless only anchor is BOL and multiline is set] */ |
a0d0e21e |
257 | if (prog->reganch & ROPT_ANCH) { |
258 | if (regtry(prog, startpos)) |
259 | goto got_it; |
774d564b |
260 | else if (!(prog->reganch & ROPT_ANCH_GPOS) && |
261 | (multiline || (prog->reganch & ROPT_IMPLICIT))) |
262 | { |
a0d0e21e |
263 | if (minlen) |
264 | dontbother = minlen - 1; |
265 | strend -= dontbother; |
266 | /* for multiline we only have to try after newlines */ |
267 | if (s > startpos) |
268 | s--; |
269 | while (s < strend) { |
270 | if (*s++ == '\n') { |
271 | if (s < strend && regtry(prog, s)) |
272 | goto got_it; |
273 | } |
35c8bce7 |
274 | } |
35c8bce7 |
275 | } |
a0d0e21e |
276 | goto phooey; |
277 | } |
35c8bce7 |
278 | |
a0d0e21e |
279 | /* Messy cases: unanchored match. */ |
280 | if (prog->regstart) { |
281 | if (prog->reganch & ROPT_SKIP) { /* we have /x+whatever/ */ |
282 | /* it must be a one character string */ |
bbce6d69 |
283 | char ch = SvPVX(prog->regstart)[0]; |
a0d0e21e |
284 | while (s < strend) { |
bbce6d69 |
285 | if (*s == ch) { |
a0d0e21e |
286 | if (regtry(prog, s)) |
a687059c |
287 | goto got_it; |
a0d0e21e |
288 | s++; |
bbce6d69 |
289 | while (s < strend && *s == ch) |
a0d0e21e |
290 | s++; |
a687059c |
291 | } |
a0d0e21e |
292 | s++; |
293 | } |
a687059c |
294 | } |
47109bfb |
295 | else if (SvTYPE(prog->regstart) == SVt_PVBM) { |
a0d0e21e |
296 | /* We know what string it must start with. */ |
297 | while ((s = fbm_instr((unsigned char*)s, |
298 | (unsigned char*)strend, prog->regstart)) != NULL) |
299 | { |
300 | if (regtry(prog, s)) |
301 | goto got_it; |
302 | s++; |
303 | } |
304 | } |
47109bfb |
305 | else { /* Optimized fbm_instr: */ |
a0d0e21e |
306 | c = SvPVX(prog->regstart); |
307 | while ((s = ninstr(s, strend, c, c + SvCUR(prog->regstart))) != NULL) |
308 | { |
309 | if (regtry(prog, s)) |
310 | goto got_it; |
311 | s++; |
312 | } |
313 | } |
314 | goto phooey; |
315 | } |
316 | /*SUPPRESS 560*/ |
317 | if (c = prog->regstclass) { |
318 | I32 doevery = (prog->reganch & ROPT_SKIP) == 0; |
a687059c |
319 | |
a0d0e21e |
320 | if (minlen) |
321 | dontbother = minlen - 1; |
322 | strend -= dontbother; /* don't bother with what can't match */ |
323 | tmp = 1; |
324 | /* We know what class it must start with. */ |
325 | switch (OP(c)) { |
326 | case ANYOF: |
327 | c = OPERAND(c); |
328 | while (s < strend) { |
bbce6d69 |
329 | if (reginclass(c, *s)) { |
a0d0e21e |
330 | if (tmp && regtry(prog, s)) |
331 | goto got_it; |
332 | else |
333 | tmp = doevery; |
a687059c |
334 | } |
a0d0e21e |
335 | else |
336 | tmp = 1; |
337 | s++; |
338 | } |
339 | break; |
bbce6d69 |
340 | case BOUNDL: |
341 | regtainted = TRUE; |
342 | /* FALL THROUGH */ |
a0d0e21e |
343 | case BOUND: |
344 | if (minlen) |
345 | dontbother++,strend--; |
bbce6d69 |
346 | tmp = (s != startpos) ? UCHARAT(s - 1) : regprev; |
95bac841 |
347 | tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); |
a0d0e21e |
348 | while (s < strend) { |
95bac841 |
349 | if (tmp == !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) { |
a0d0e21e |
350 | tmp = !tmp; |
351 | if (regtry(prog, s)) |
352 | goto got_it; |
a687059c |
353 | } |
a0d0e21e |
354 | s++; |
355 | } |
356 | if ((minlen || tmp) && regtry(prog,s)) |
357 | goto got_it; |
358 | break; |
bbce6d69 |
359 | case NBOUNDL: |
360 | regtainted = TRUE; |
361 | /* FALL THROUGH */ |
a0d0e21e |
362 | case NBOUND: |
363 | if (minlen) |
364 | dontbother++,strend--; |
bbce6d69 |
365 | tmp = (s != startpos) ? UCHARAT(s - 1) : regprev; |
95bac841 |
366 | tmp = ((OP(c) == NBOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); |
a0d0e21e |
367 | while (s < strend) { |
95bac841 |
368 | if (tmp == !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s))) |
a0d0e21e |
369 | tmp = !tmp; |
370 | else if (regtry(prog, s)) |
371 | goto got_it; |
372 | s++; |
373 | } |
374 | if ((minlen || !tmp) && regtry(prog,s)) |
375 | goto got_it; |
376 | break; |
377 | case ALNUM: |
378 | while (s < strend) { |
bbce6d69 |
379 | if (isALNUM(*s)) { |
380 | if (tmp && regtry(prog, s)) |
381 | goto got_it; |
382 | else |
383 | tmp = doevery; |
384 | } |
385 | else |
386 | tmp = 1; |
387 | s++; |
388 | } |
389 | break; |
390 | case ALNUML: |
391 | regtainted = TRUE; |
392 | while (s < strend) { |
393 | if (isALNUM_LC(*s)) { |
a0d0e21e |
394 | if (tmp && regtry(prog, s)) |
395 | goto got_it; |
a687059c |
396 | else |
a0d0e21e |
397 | tmp = doevery; |
398 | } |
399 | else |
400 | tmp = 1; |
401 | s++; |
402 | } |
403 | break; |
404 | case NALNUM: |
405 | while (s < strend) { |
bbce6d69 |
406 | if (!isALNUM(*s)) { |
407 | if (tmp && regtry(prog, s)) |
408 | goto got_it; |
409 | else |
410 | tmp = doevery; |
411 | } |
412 | else |
413 | tmp = 1; |
414 | s++; |
415 | } |
416 | break; |
417 | case NALNUML: |
418 | regtainted = TRUE; |
419 | while (s < strend) { |
420 | if (!isALNUM_LC(*s)) { |
a0d0e21e |
421 | if (tmp && regtry(prog, s)) |
422 | goto got_it; |
a687059c |
423 | else |
a0d0e21e |
424 | tmp = doevery; |
a687059c |
425 | } |
a0d0e21e |
426 | else |
427 | tmp = 1; |
428 | s++; |
429 | } |
430 | break; |
431 | case SPACE: |
432 | while (s < strend) { |
433 | if (isSPACE(*s)) { |
434 | if (tmp && regtry(prog, s)) |
435 | goto got_it; |
436 | else |
437 | tmp = doevery; |
2304df62 |
438 | } |
a0d0e21e |
439 | else |
440 | tmp = 1; |
441 | s++; |
442 | } |
443 | break; |
bbce6d69 |
444 | case SPACEL: |
445 | regtainted = TRUE; |
446 | while (s < strend) { |
447 | if (isSPACE_LC(*s)) { |
448 | if (tmp && regtry(prog, s)) |
449 | goto got_it; |
450 | else |
451 | tmp = doevery; |
452 | } |
453 | else |
454 | tmp = 1; |
455 | s++; |
456 | } |
457 | break; |
a0d0e21e |
458 | case NSPACE: |
459 | while (s < strend) { |
460 | if (!isSPACE(*s)) { |
461 | if (tmp && regtry(prog, s)) |
462 | goto got_it; |
463 | else |
464 | tmp = doevery; |
a687059c |
465 | } |
a0d0e21e |
466 | else |
467 | tmp = 1; |
468 | s++; |
469 | } |
470 | break; |
bbce6d69 |
471 | case NSPACEL: |
472 | regtainted = TRUE; |
473 | while (s < strend) { |
474 | if (!isSPACE_LC(*s)) { |
475 | if (tmp && regtry(prog, s)) |
476 | goto got_it; |
477 | else |
478 | tmp = doevery; |
479 | } |
480 | else |
481 | tmp = 1; |
482 | s++; |
483 | } |
484 | break; |
a0d0e21e |
485 | case DIGIT: |
486 | while (s < strend) { |
487 | if (isDIGIT(*s)) { |
488 | if (tmp && regtry(prog, s)) |
489 | goto got_it; |
490 | else |
491 | tmp = doevery; |
2b69d0c2 |
492 | } |
a0d0e21e |
493 | else |
494 | tmp = 1; |
495 | s++; |
496 | } |
497 | break; |
498 | case NDIGIT: |
499 | while (s < strend) { |
500 | if (!isDIGIT(*s)) { |
501 | if (tmp && regtry(prog, s)) |
502 | goto got_it; |
503 | else |
504 | tmp = doevery; |
a687059c |
505 | } |
a0d0e21e |
506 | else |
507 | tmp = 1; |
508 | s++; |
509 | } |
510 | break; |
a687059c |
511 | } |
a0d0e21e |
512 | } |
513 | else { |
514 | if (minlen) |
515 | dontbother = minlen - 1; |
516 | strend -= dontbother; |
517 | /* We don't know much -- general case. */ |
518 | do { |
519 | if (regtry(prog, s)) |
520 | goto got_it; |
521 | } while (s++ < strend); |
522 | } |
523 | |
524 | /* Failure. */ |
525 | goto phooey; |
a687059c |
526 | |
a0d0e21e |
527 | got_it: |
420218e7 |
528 | strend += dontbother; /* uncheat */ |
a0d0e21e |
529 | prog->subbeg = strbeg; |
530 | prog->subend = strend; |
bbce6d69 |
531 | prog->exec_tainted = regtainted; |
5f05dabc |
532 | |
533 | /* make sure $`, $&, $', and $digit will work later */ |
137443ea |
534 | if (strbeg != prog->subbase) { |
535 | if (safebase) { |
536 | if (prog->subbase) { |
537 | Safefree(prog->subbase); |
538 | prog->subbase = Nullch; |
539 | } |
540 | } |
541 | else { |
542 | I32 i = strend - startpos + (stringarg - strbeg); |
543 | s = savepvn(strbeg, i); |
544 | Safefree(prog->subbase); |
545 | prog->subbase = s; |
546 | prog->subbeg = prog->subbase; |
547 | prog->subend = prog->subbase + i; |
548 | s = prog->subbase + (stringarg - strbeg); |
549 | for (i = 0; i <= prog->nparens; i++) { |
550 | if (prog->endp[i]) { |
551 | prog->startp[i] = s + (prog->startp[i] - startpos); |
552 | prog->endp[i] = s + (prog->endp[i] - startpos); |
553 | } |
a0d0e21e |
554 | } |
555 | } |
a0d0e21e |
556 | } |
557 | return 1; |
558 | |
559 | phooey: |
a0d0e21e |
560 | return 0; |
a687059c |
561 | } |
562 | |
563 | /* |
564 | - regtry - try match at specific point |
565 | */ |
79072805 |
566 | static I32 /* 0 failure, 1 success */ |
a0d0e21e |
567 | regtry(prog, startpos) |
a687059c |
568 | regexp *prog; |
a0d0e21e |
569 | char *startpos; |
a687059c |
570 | { |
a0d0e21e |
571 | register I32 i; |
572 | register char **sp; |
573 | register char **ep; |
574 | |
575 | reginput = startpos; |
576 | regstartp = prog->startp; |
577 | regendp = prog->endp; |
578 | reglastparen = &prog->lastparen; |
579 | prog->lastparen = 0; |
580 | regsize = 0; |
581 | |
582 | sp = prog->startp; |
583 | ep = prog->endp; |
584 | if (prog->nparens) { |
585 | for (i = prog->nparens; i >= 0; i--) { |
586 | *sp++ = NULL; |
587 | *ep++ = NULL; |
a687059c |
588 | } |
a0d0e21e |
589 | } |
590 | if (regmatch(prog->program + 1) && reginput >= regtill) { |
591 | prog->startp[0] = startpos; |
592 | prog->endp[0] = reginput; |
593 | return 1; |
594 | } |
595 | else |
596 | return 0; |
a687059c |
597 | } |
598 | |
599 | /* |
600 | - regmatch - main matching routine |
601 | * |
602 | * Conceptually the strategy is simple: check to see whether the current |
603 | * node matches, call self recursively to see whether the rest matches, |
604 | * and then act accordingly. In practice we make some effort to avoid |
605 | * recursion, in particular by going through "ordinary" nodes (that don't |
606 | * need to know whether the rest of the match failed) by a loop instead of |
607 | * by recursion. |
608 | */ |
609 | /* [lwall] I've hoisted the register declarations to the outer block in order to |
610 | * maybe save a little bit of pushing and popping on the stack. It also takes |
611 | * advantage of machines that use a register save mask on subroutine entry. |
612 | */ |
79072805 |
613 | static I32 /* 0 failure, 1 success */ |
a687059c |
614 | regmatch(prog) |
615 | char *prog; |
616 | { |
a0d0e21e |
617 | register char *scan; /* Current node. */ |
618 | char *next; /* Next node. */ |
619 | register I32 nextchar; |
620 | register I32 n; /* no or next */ |
621 | register I32 ln; /* len or last */ |
622 | register char *s; /* operand or save */ |
623 | register char *locinput = reginput; |
bbce6d69 |
624 | register I32 c1, c2; /* case fold search */ |
a0d0e21e |
625 | int minmod = 0; |
4633a7c4 |
626 | #ifdef DEBUGGING |
627 | static int regindent = 0; |
628 | regindent++; |
629 | #endif |
a0d0e21e |
630 | |
bbce6d69 |
631 | nextchar = UCHARAT(locinput); |
a0d0e21e |
632 | scan = prog; |
633 | while (scan != NULL) { |
a687059c |
634 | #ifdef DEBUGGING |
4633a7c4 |
635 | #define sayYES goto yes |
636 | #define sayNO goto no |
637 | #define saySAME(x) if (x) goto yes; else goto no |
638 | if (regnarrate) { |
46fc3d4c |
639 | SV *prop = sv_newmortal(); |
640 | regprop(prop, scan); |
641 | PerlIO_printf(Perl_debug_log, "%*s%2d%-8.8s\t<%.10s>\n", |
642 | regindent*2, "", scan - regprogram, |
643 | SvPVX(prop), locinput); |
4633a7c4 |
644 | } |
645 | #else |
646 | #define sayYES return 1 |
647 | #define sayNO return 0 |
648 | #define saySAME(x) return x |
a687059c |
649 | #endif |
650 | |
651 | #ifdef REGALIGN |
a0d0e21e |
652 | next = scan + NEXT(scan); |
653 | if (next == scan) |
654 | next = NULL; |
a687059c |
655 | #else |
a0d0e21e |
656 | next = regnext(scan); |
a687059c |
657 | #endif |
658 | |
a0d0e21e |
659 | switch (OP(scan)) { |
660 | case BOL: |
661 | if (locinput == regbol |
662 | ? regprev == '\n' |
663 | : ((nextchar || locinput < regeol) && locinput[-1] == '\n') ) |
664 | { |
665 | /* regtill = regbol; */ |
666 | break; |
667 | } |
4633a7c4 |
668 | sayNO; |
a0d0e21e |
669 | case MBOL: |
670 | if (locinput == regbol |
671 | ? regprev == '\n' |
672 | : ((nextchar || locinput < regeol) && locinput[-1] == '\n') ) |
673 | { |
674 | break; |
675 | } |
4633a7c4 |
676 | sayNO; |
a0d0e21e |
677 | case SBOL: |
678 | if (locinput == regbol && regprev == '\n') |
679 | break; |
4633a7c4 |
680 | sayNO; |
774d564b |
681 | case GPOS: |
a0d0e21e |
682 | if (locinput == regbol) |
683 | break; |
4633a7c4 |
684 | sayNO; |
a0d0e21e |
685 | case EOL: |
686 | if (multiline) |
687 | goto meol; |
688 | else |
689 | goto seol; |
690 | case MEOL: |
691 | meol: |
692 | if ((nextchar || locinput < regeol) && nextchar != '\n') |
4633a7c4 |
693 | sayNO; |
a0d0e21e |
694 | break; |
695 | case SEOL: |
696 | seol: |
697 | if ((nextchar || locinput < regeol) && nextchar != '\n') |
4633a7c4 |
698 | sayNO; |
a0d0e21e |
699 | if (regeol - locinput > 1) |
4633a7c4 |
700 | sayNO; |
a0d0e21e |
701 | break; |
702 | case SANY: |
703 | if (!nextchar && locinput >= regeol) |
4633a7c4 |
704 | sayNO; |
bbce6d69 |
705 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
706 | break; |
707 | case ANY: |
708 | if (!nextchar && locinput >= regeol || nextchar == '\n') |
4633a7c4 |
709 | sayNO; |
bbce6d69 |
710 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
711 | break; |
bbce6d69 |
712 | case EXACT: |
a0d0e21e |
713 | s = OPERAND(scan); |
714 | ln = *s++; |
715 | /* Inline the first character, for speed. */ |
95bac841 |
716 | if (UCHARAT(s) != nextchar) |
4633a7c4 |
717 | sayNO; |
a0d0e21e |
718 | if (regeol - locinput < ln) |
4633a7c4 |
719 | sayNO; |
36477c24 |
720 | if (ln > 1 && memNE(s, locinput, ln)) |
4633a7c4 |
721 | sayNO; |
a0d0e21e |
722 | locinput += ln; |
bbce6d69 |
723 | nextchar = UCHARAT(locinput); |
724 | break; |
725 | case EXACTFL: |
726 | regtainted = TRUE; |
727 | /* FALL THROUGH */ |
728 | case EXACTF: |
729 | s = OPERAND(scan); |
730 | ln = *s++; |
731 | /* Inline the first character, for speed. */ |
732 | if (UCHARAT(s) != nextchar && |
733 | UCHARAT(s) != ((OP(scan) == EXACTF) |
734 | ? fold : fold_locale)[nextchar]) |
735 | sayNO; |
736 | if (regeol - locinput < ln) |
737 | sayNO; |
5f05dabc |
738 | if (ln > 1 && (OP(scan) == EXACTF |
739 | ? ibcmp(s, locinput, ln) |
740 | : ibcmp_locale(s, locinput, ln))) |
bbce6d69 |
741 | sayNO; |
742 | locinput += ln; |
743 | nextchar = UCHARAT(locinput); |
a0d0e21e |
744 | break; |
745 | case ANYOF: |
746 | s = OPERAND(scan); |
747 | if (nextchar < 0) |
748 | nextchar = UCHARAT(locinput); |
bbce6d69 |
749 | if (!reginclass(s, nextchar)) |
4633a7c4 |
750 | sayNO; |
a0d0e21e |
751 | if (!nextchar && locinput >= regeol) |
4633a7c4 |
752 | sayNO; |
bbce6d69 |
753 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
754 | break; |
bbce6d69 |
755 | case ALNUML: |
756 | regtainted = TRUE; |
757 | /* FALL THROUGH */ |
a0d0e21e |
758 | case ALNUM: |
759 | if (!nextchar) |
4633a7c4 |
760 | sayNO; |
bbce6d69 |
761 | if (!(OP(scan) == ALNUM |
762 | ? isALNUM(nextchar) : isALNUM_LC(nextchar))) |
4633a7c4 |
763 | sayNO; |
bbce6d69 |
764 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
765 | break; |
bbce6d69 |
766 | case NALNUML: |
767 | regtainted = TRUE; |
768 | /* FALL THROUGH */ |
a0d0e21e |
769 | case NALNUM: |
770 | if (!nextchar && locinput >= regeol) |
4633a7c4 |
771 | sayNO; |
bbce6d69 |
772 | if (OP(scan) == NALNUM |
773 | ? isALNUM(nextchar) : isALNUM_LC(nextchar)) |
4633a7c4 |
774 | sayNO; |
bbce6d69 |
775 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
776 | break; |
bbce6d69 |
777 | case BOUNDL: |
778 | case NBOUNDL: |
779 | regtainted = TRUE; |
780 | /* FALL THROUGH */ |
a0d0e21e |
781 | case BOUND: |
bbce6d69 |
782 | case NBOUND: |
783 | /* was last char in word? */ |
784 | ln = (locinput != regbol) ? UCHARAT(locinput - 1) : regprev; |
785 | if (OP(scan) == BOUND || OP(scan) == NBOUND) { |
786 | ln = isALNUM(ln); |
787 | n = isALNUM(nextchar); |
788 | } |
789 | else { |
790 | ln = isALNUM_LC(ln); |
791 | n = isALNUM_LC(nextchar); |
792 | } |
95bac841 |
793 | if (((!ln) == (!n)) == (OP(scan) == BOUND || OP(scan) == BOUNDL)) |
4633a7c4 |
794 | sayNO; |
a0d0e21e |
795 | break; |
bbce6d69 |
796 | case SPACEL: |
797 | regtainted = TRUE; |
798 | /* FALL THROUGH */ |
a0d0e21e |
799 | case SPACE: |
800 | if (!nextchar && locinput >= regeol) |
4633a7c4 |
801 | sayNO; |
bbce6d69 |
802 | if (!(OP(scan) == SPACE |
803 | ? isSPACE(nextchar) : isSPACE_LC(nextchar))) |
4633a7c4 |
804 | sayNO; |
bbce6d69 |
805 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
806 | break; |
bbce6d69 |
807 | case NSPACEL: |
808 | regtainted = TRUE; |
809 | /* FALL THROUGH */ |
a0d0e21e |
810 | case NSPACE: |
811 | if (!nextchar) |
4633a7c4 |
812 | sayNO; |
bbce6d69 |
813 | if (OP(scan) == SPACE |
814 | ? isSPACE(nextchar) : isSPACE_LC(nextchar)) |
4633a7c4 |
815 | sayNO; |
bbce6d69 |
816 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
817 | break; |
818 | case DIGIT: |
819 | if (!isDIGIT(nextchar)) |
4633a7c4 |
820 | sayNO; |
bbce6d69 |
821 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
822 | break; |
823 | case NDIGIT: |
824 | if (!nextchar && locinput >= regeol) |
4633a7c4 |
825 | sayNO; |
a0d0e21e |
826 | if (isDIGIT(nextchar)) |
4633a7c4 |
827 | sayNO; |
bbce6d69 |
828 | nextchar = UCHARAT(++locinput); |
a0d0e21e |
829 | break; |
830 | case REF: |
831 | n = ARG1(scan); /* which paren pair */ |
832 | s = regstartp[n]; |
833 | if (!s) |
4633a7c4 |
834 | sayNO; |
a0d0e21e |
835 | if (!regendp[n]) |
4633a7c4 |
836 | sayNO; |
a0d0e21e |
837 | if (s == regendp[n]) |
838 | break; |
839 | /* Inline the first character, for speed. */ |
95bac841 |
840 | if (UCHARAT(s) != nextchar) |
4633a7c4 |
841 | sayNO; |
a0d0e21e |
842 | ln = regendp[n] - s; |
843 | if (locinput + ln > regeol) |
4633a7c4 |
844 | sayNO; |
36477c24 |
845 | if (ln > 1 && memNE(s, locinput, ln)) |
4633a7c4 |
846 | sayNO; |
a0d0e21e |
847 | locinput += ln; |
bbce6d69 |
848 | nextchar = UCHARAT(locinput); |
a0d0e21e |
849 | break; |
850 | |
851 | case NOTHING: |
852 | break; |
853 | case BACK: |
854 | break; |
855 | case OPEN: |
856 | n = ARG1(scan); /* which paren pair */ |
857 | regstartp[n] = locinput; |
858 | if (n > regsize) |
859 | regsize = n; |
860 | break; |
861 | case CLOSE: |
862 | n = ARG1(scan); /* which paren pair */ |
863 | regendp[n] = locinput; |
864 | if (n > *reglastparen) |
865 | *reglastparen = n; |
866 | break; |
867 | case CURLYX: { |
11343788 |
868 | dTHR; |
a0d0e21e |
869 | CURCUR cc; |
870 | CHECKPOINT cp = savestack_ix; |
871 | cc.oldcc = regcc; |
872 | regcc = &cc; |
873 | cc.parenfloor = *reglastparen; |
874 | cc.cur = -1; |
875 | cc.min = ARG1(scan); |
876 | cc.max = ARG2(scan); |
877 | cc.scan = NEXTOPER(scan) + 4; |
878 | cc.next = next; |
879 | cc.minmod = minmod; |
880 | cc.lastloc = 0; |
881 | reginput = locinput; |
882 | n = regmatch(PREVOPER(next)); /* start on the WHILEM */ |
883 | regcpblow(cp); |
884 | regcc = cc.oldcc; |
4633a7c4 |
885 | saySAME(n); |
a0d0e21e |
886 | } |
887 | /* NOT REACHED */ |
888 | case WHILEM: { |
889 | /* |
890 | * This is really hard to understand, because after we match |
891 | * what we're trying to match, we must make sure the rest of |
892 | * the RE is going to match for sure, and to do that we have |
893 | * to go back UP the parse tree by recursing ever deeper. And |
894 | * if it fails, we have to reset our parent's current state |
895 | * that we can try again after backing off. |
896 | */ |
897 | |
5f05dabc |
898 | CHECKPOINT cp; |
a0d0e21e |
899 | CURCUR* cc = regcc; |
4633a7c4 |
900 | n = cc->cur + 1; /* how many we know we matched */ |
a0d0e21e |
901 | reginput = locinput; |
902 | |
4633a7c4 |
903 | #ifdef DEBUGGING |
904 | if (regnarrate) |
68dc0745 |
905 | PerlIO_printf(Perl_debug_log, "%*s %ld %lx\n", regindent*2, "", |
906 | (long)n, (long)cc); |
4633a7c4 |
907 | #endif |
908 | |
a0d0e21e |
909 | /* If degenerate scan matches "", assume scan done. */ |
910 | |
579cf2c3 |
911 | if (locinput == cc->lastloc && n >= cc->min) { |
a0d0e21e |
912 | regcc = cc->oldcc; |
913 | ln = regcc->cur; |
914 | if (regmatch(cc->next)) |
4633a7c4 |
915 | sayYES; |
a0d0e21e |
916 | regcc->cur = ln; |
917 | regcc = cc; |
4633a7c4 |
918 | sayNO; |
a0d0e21e |
919 | } |
920 | |
921 | /* First just match a string of min scans. */ |
922 | |
923 | if (n < cc->min) { |
924 | cc->cur = n; |
925 | cc->lastloc = locinput; |
4633a7c4 |
926 | if (regmatch(cc->scan)) |
927 | sayYES; |
928 | cc->cur = n - 1; |
929 | sayNO; |
a0d0e21e |
930 | } |
931 | |
932 | /* Prefer next over scan for minimal matching. */ |
933 | |
934 | if (cc->minmod) { |
935 | regcc = cc->oldcc; |
936 | ln = regcc->cur; |
5f05dabc |
937 | cp = regcppush(cc->parenfloor); |
938 | if (regmatch(cc->next)) { |
939 | regcpblow(cp); |
4633a7c4 |
940 | sayYES; /* All done. */ |
5f05dabc |
941 | } |
942 | regcppop(); |
a0d0e21e |
943 | regcc->cur = ln; |
944 | regcc = cc; |
945 | |
946 | if (n >= cc->max) /* Maximum greed exceeded? */ |
4633a7c4 |
947 | sayNO; |
a687059c |
948 | |
a0d0e21e |
949 | /* Try scanning more and see if it helps. */ |
950 | reginput = locinput; |
951 | cc->cur = n; |
952 | cc->lastloc = locinput; |
5f05dabc |
953 | cp = regcppush(cc->parenfloor); |
954 | if (regmatch(cc->scan)) { |
955 | regcpblow(cp); |
4633a7c4 |
956 | sayYES; |
5f05dabc |
957 | } |
958 | regcppop(); |
4633a7c4 |
959 | cc->cur = n - 1; |
960 | sayNO; |
a0d0e21e |
961 | } |
962 | |
963 | /* Prefer scan over next for maximal matching. */ |
964 | |
965 | if (n < cc->max) { /* More greed allowed? */ |
5f05dabc |
966 | cp = regcppush(cc->parenfloor); |
a0d0e21e |
967 | cc->cur = n; |
968 | cc->lastloc = locinput; |
5f05dabc |
969 | if (regmatch(cc->scan)) { |
970 | regcpblow(cp); |
4633a7c4 |
971 | sayYES; |
5f05dabc |
972 | } |
a0d0e21e |
973 | regcppop(); /* Restore some previous $<digit>s? */ |
974 | reginput = locinput; |
975 | } |
976 | |
977 | /* Failed deeper matches of scan, so see if this one works. */ |
978 | regcc = cc->oldcc; |
979 | ln = regcc->cur; |
980 | if (regmatch(cc->next)) |
4633a7c4 |
981 | sayYES; |
a0d0e21e |
982 | regcc->cur = ln; |
983 | regcc = cc; |
4633a7c4 |
984 | cc->cur = n - 1; |
985 | sayNO; |
a0d0e21e |
986 | } |
987 | /* NOT REACHED */ |
988 | case BRANCH: { |
989 | if (OP(next) != BRANCH) /* No choice. */ |
990 | next = NEXTOPER(scan);/* Avoid recursion. */ |
991 | else { |
748a9306 |
992 | int lastparen = *reglastparen; |
a0d0e21e |
993 | do { |
994 | reginput = locinput; |
995 | if (regmatch(NEXTOPER(scan))) |
4633a7c4 |
996 | sayYES; |
748a9306 |
997 | for (n = *reglastparen; n > lastparen; n--) |
998 | regendp[n] = 0; |
999 | *reglastparen = n; |
1000 | |
a687059c |
1001 | #ifdef REGALIGN |
a0d0e21e |
1002 | /*SUPPRESS 560*/ |
1003 | if (n = NEXT(scan)) |
1004 | scan += n; |
1005 | else |
1006 | scan = NULL; |
a687059c |
1007 | #else |
a0d0e21e |
1008 | scan = regnext(scan); |
79072805 |
1009 | #endif |
a0d0e21e |
1010 | } while (scan != NULL && OP(scan) == BRANCH); |
4633a7c4 |
1011 | sayNO; |
a0d0e21e |
1012 | /* NOTREACHED */ |
a687059c |
1013 | } |
a0d0e21e |
1014 | } |
1015 | break; |
1016 | case MINMOD: |
1017 | minmod = 1; |
1018 | break; |
1019 | case CURLY: |
1020 | ln = ARG1(scan); /* min to match */ |
1021 | n = ARG2(scan); /* max to match */ |
1022 | scan = NEXTOPER(scan) + 4; |
1023 | goto repeat; |
1024 | case STAR: |
1025 | ln = 0; |
1026 | n = 32767; |
1027 | scan = NEXTOPER(scan); |
1028 | goto repeat; |
1029 | case PLUS: |
1030 | /* |
1031 | * Lookahead to avoid useless match attempts |
1032 | * when we know what character comes next. |
1033 | */ |
1034 | ln = 1; |
1035 | n = 32767; |
1036 | scan = NEXTOPER(scan); |
1037 | repeat: |
bbce6d69 |
1038 | if (regkind[(U8)OP(next)] == EXACT) { |
1039 | c1 = UCHARAT(OPERAND(next) + 1); |
1040 | if (OP(next) == EXACTF) |
1041 | c2 = fold[c1]; |
1042 | else if (OP(next) == EXACTFL) |
1043 | c2 = fold_locale[c1]; |
1044 | else |
1045 | c2 = c1; |
1046 | } |
a0d0e21e |
1047 | else |
bbce6d69 |
1048 | c1 = c2 = -1000; |
a0d0e21e |
1049 | reginput = locinput; |
1050 | if (minmod) { |
1051 | minmod = 0; |
1052 | if (ln && regrepeat(scan, ln) < ln) |
4633a7c4 |
1053 | sayNO; |
8e07c86e |
1054 | while (n >= ln || (n == 32767 && ln > 0)) { /* ln overflow ? */ |
a0d0e21e |
1055 | /* If it could work, try it. */ |
bbce6d69 |
1056 | if (c1 == -1000 || |
1057 | UCHARAT(reginput) == c1 || |
1058 | UCHARAT(reginput) == c2) |
1059 | { |
a0d0e21e |
1060 | if (regmatch(next)) |
4633a7c4 |
1061 | sayYES; |
bbce6d69 |
1062 | } |
a0d0e21e |
1063 | /* Couldn't or didn't -- back up. */ |
748a9306 |
1064 | reginput = locinput + ln; |
a0d0e21e |
1065 | if (regrepeat(scan, 1)) { |
1066 | ln++; |
1067 | reginput = locinput + ln; |
1068 | } |
1069 | else |
4633a7c4 |
1070 | sayNO; |
a0d0e21e |
1071 | } |
1072 | } |
1073 | else { |
1074 | n = regrepeat(scan, n); |
1075 | if (ln < n && regkind[(U8)OP(next)] == EOL && |
1076 | (!multiline || OP(next) == SEOL)) |
1077 | ln = n; /* why back off? */ |
1078 | while (n >= ln) { |
1079 | /* If it could work, try it. */ |
bbce6d69 |
1080 | if (c1 == -1000 || |
1081 | UCHARAT(reginput) == c1 || |
1082 | UCHARAT(reginput) == c2) |
1083 | { |
a0d0e21e |
1084 | if (regmatch(next)) |
4633a7c4 |
1085 | sayYES; |
bbce6d69 |
1086 | } |
a0d0e21e |
1087 | /* Couldn't or didn't -- back up. */ |
1088 | n--; |
1089 | reginput = locinput + n; |
1090 | } |
1091 | } |
4633a7c4 |
1092 | sayNO; |
a0d0e21e |
1093 | case SUCCEED: |
1094 | case END: |
1095 | reginput = locinput; /* put where regtry can find it */ |
4633a7c4 |
1096 | sayYES; /* Success! */ |
a0d0e21e |
1097 | case IFMATCH: |
1098 | reginput = locinput; |
1099 | scan = NEXTOPER(scan); |
1100 | if (!regmatch(scan)) |
4633a7c4 |
1101 | sayNO; |
a0d0e21e |
1102 | break; |
1103 | case UNLESSM: |
1104 | reginput = locinput; |
1105 | scan = NEXTOPER(scan); |
1106 | if (regmatch(scan)) |
4633a7c4 |
1107 | sayNO; |
a0d0e21e |
1108 | break; |
1109 | default: |
c030ccd9 |
1110 | PerlIO_printf(PerlIO_stderr(), "%lx %d\n", |
1111 | (unsigned long)scan, scan[1]); |
a0d0e21e |
1112 | FAIL("regexp memory corruption"); |
a687059c |
1113 | } |
a0d0e21e |
1114 | scan = next; |
1115 | } |
a687059c |
1116 | |
a0d0e21e |
1117 | /* |
1118 | * We get here only if there's trouble -- normally "case END" is |
1119 | * the terminating point. |
1120 | */ |
1121 | FAIL("corrupted regexp pointers"); |
1122 | /*NOTREACHED*/ |
4633a7c4 |
1123 | sayNO; |
1124 | |
1125 | yes: |
1126 | #ifdef DEBUGGING |
1127 | regindent--; |
1128 | #endif |
1129 | return 1; |
1130 | |
1131 | no: |
1132 | #ifdef DEBUGGING |
1133 | regindent--; |
1134 | #endif |
a0d0e21e |
1135 | return 0; |
a687059c |
1136 | } |
1137 | |
1138 | /* |
1139 | - regrepeat - repeatedly match something simple, report how many |
1140 | */ |
1141 | /* |
1142 | * [This routine now assumes that it will only match on things of length 1. |
1143 | * That was true before, but now we assume scan - reginput is the count, |
1144 | * rather than incrementing count on every character.] |
1145 | */ |
79072805 |
1146 | static I32 |
00bf170e |
1147 | regrepeat(p, max) |
a687059c |
1148 | char *p; |
79072805 |
1149 | I32 max; |
a687059c |
1150 | { |
a0d0e21e |
1151 | register char *scan; |
1152 | register char *opnd; |
1153 | register I32 c; |
1154 | register char *loceol = regeol; |
1155 | |
1156 | scan = reginput; |
1157 | if (max != 32767 && max < loceol - scan) |
1158 | loceol = scan + max; |
1159 | opnd = OPERAND(p); |
1160 | switch (OP(p)) { |
1161 | case ANY: |
1162 | while (scan < loceol && *scan != '\n') |
1163 | scan++; |
1164 | break; |
1165 | case SANY: |
1166 | scan = loceol; |
1167 | break; |
bbce6d69 |
1168 | case EXACT: /* length of string is 1 */ |
1169 | c = UCHARAT(++opnd); |
1170 | while (scan < loceol && UCHARAT(scan) == c) |
1171 | scan++; |
1172 | break; |
1173 | case EXACTF: /* length of string is 1 */ |
1174 | c = UCHARAT(++opnd); |
1175 | while (scan < loceol && |
1176 | (UCHARAT(scan) == c || UCHARAT(scan) == fold[c])) |
1177 | scan++; |
1178 | break; |
1179 | case EXACTFL: /* length of string is 1 */ |
1180 | regtainted = TRUE; |
1181 | c = UCHARAT(++opnd); |
1182 | while (scan < loceol && |
1183 | (UCHARAT(scan) == c || UCHARAT(scan) == fold_locale[c])) |
a0d0e21e |
1184 | scan++; |
1185 | break; |
1186 | case ANYOF: |
bbce6d69 |
1187 | while (scan < loceol && reginclass(opnd, *scan)) |
a0d0e21e |
1188 | scan++; |
a0d0e21e |
1189 | break; |
1190 | case ALNUM: |
1191 | while (scan < loceol && isALNUM(*scan)) |
1192 | scan++; |
1193 | break; |
bbce6d69 |
1194 | case ALNUML: |
1195 | regtainted = TRUE; |
1196 | while (scan < loceol && isALNUM_LC(*scan)) |
1197 | scan++; |
1198 | break; |
a0d0e21e |
1199 | case NALNUM: |
1200 | while (scan < loceol && !isALNUM(*scan)) |
1201 | scan++; |
1202 | break; |
bbce6d69 |
1203 | case NALNUML: |
1204 | regtainted = TRUE; |
1205 | while (scan < loceol && !isALNUM_LC(*scan)) |
1206 | scan++; |
1207 | break; |
a0d0e21e |
1208 | case SPACE: |
1209 | while (scan < loceol && isSPACE(*scan)) |
1210 | scan++; |
1211 | break; |
bbce6d69 |
1212 | case SPACEL: |
1213 | regtainted = TRUE; |
1214 | while (scan < loceol && isSPACE_LC(*scan)) |
1215 | scan++; |
1216 | break; |
a0d0e21e |
1217 | case NSPACE: |
1218 | while (scan < loceol && !isSPACE(*scan)) |
1219 | scan++; |
1220 | break; |
bbce6d69 |
1221 | case NSPACEL: |
1222 | regtainted = TRUE; |
1223 | while (scan < loceol && !isSPACE_LC(*scan)) |
1224 | scan++; |
1225 | break; |
a0d0e21e |
1226 | case DIGIT: |
1227 | while (scan < loceol && isDIGIT(*scan)) |
1228 | scan++; |
1229 | break; |
1230 | case NDIGIT: |
1231 | while (scan < loceol && !isDIGIT(*scan)) |
1232 | scan++; |
1233 | break; |
1234 | default: /* Called on something of 0 width. */ |
1235 | break; /* So match right here or not at all. */ |
1236 | } |
a687059c |
1237 | |
a0d0e21e |
1238 | c = scan - reginput; |
1239 | reginput = scan; |
a687059c |
1240 | |
a0d0e21e |
1241 | return(c); |
a687059c |
1242 | } |
1243 | |
1244 | /* |
bbce6d69 |
1245 | - regclass - determine if a character falls into a character class |
1246 | */ |
1247 | |
1248 | static bool |
1249 | reginclass(p, c) |
1250 | register char *p; |
1251 | register I32 c; |
1252 | { |
1253 | char flags = *p; |
1254 | bool match = FALSE; |
1255 | |
1256 | c &= 0xFF; |
1257 | if (p[1 + (c >> 3)] & (1 << (c & 7))) |
1258 | match = TRUE; |
1259 | else if (flags & ANYOF_FOLD) { |
1260 | I32 cf; |
1261 | if (flags & ANYOF_LOCALE) { |
1262 | regtainted = TRUE; |
1263 | cf = fold_locale[c]; |
1264 | } |
1265 | else |
1266 | cf = fold[c]; |
1267 | if (p[1 + (cf >> 3)] & (1 << (cf & 7))) |
1268 | match = TRUE; |
1269 | } |
1270 | |
1271 | if (!match && (flags & ANYOF_ISA)) { |
1272 | regtainted = TRUE; |
1273 | |
1274 | if (((flags & ANYOF_ALNUML) && isALNUM_LC(c)) || |
1275 | ((flags & ANYOF_NALNUML) && !isALNUM_LC(c)) || |
1276 | ((flags & ANYOF_SPACEL) && isSPACE_LC(c)) || |
1277 | ((flags & ANYOF_NSPACEL) && !isSPACE_LC(c))) |
1278 | { |
1279 | match = TRUE; |
1280 | } |
1281 | } |
1282 | |
1283 | return match ^ ((flags & ANYOF_INVERT) != 0); |
1284 | } |
1285 | |
1286 | /* |
a687059c |
1287 | - regnext - dig the "next" pointer out of a node |
1288 | * |
1289 | * [Note, when REGALIGN is defined there are two places in regmatch() |
1290 | * that bypass this code for speed.] |
1291 | */ |
1292 | char * |
1293 | regnext(p) |
1294 | register char *p; |
1295 | { |
a0d0e21e |
1296 | register I32 offset; |
a687059c |
1297 | |
a0d0e21e |
1298 | if (p == ®dummy) |
1299 | return(NULL); |
a687059c |
1300 | |
a0d0e21e |
1301 | offset = NEXT(p); |
1302 | if (offset == 0) |
1303 | return(NULL); |
a687059c |
1304 | |
1305 | #ifdef REGALIGN |
a0d0e21e |
1306 | return(p+offset); |
a687059c |
1307 | #else |
a0d0e21e |
1308 | if (OP(p) == BACK) |
1309 | return(p-offset); |
1310 | else |
1311 | return(p+offset); |
a687059c |
1312 | #endif |
1313 | } |