1 /* regexec.c 2 */ 3 4 /* 5 * "One Ring to rule them all, One Ring to find them..." 6 */ 7 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 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 22 #ifdef PERL_EXT_RE_BUILD 23 /* need to replace pregcomp et al, so enable that */ 24 # ifndef PERL_IN_XSUB_RE 25 # define PERL_IN_XSUB_RE 26 # endif 27 /* need access to debugger hooks */ 28 # if defined(PERL_EXT_RE_DEBUG) && !defined(DEBUGGING) 29 # define DEBUGGING 30 # endif 31 #endif 32 33 #ifdef PERL_IN_XSUB_RE 34 /* We *really* need to overwrite these symbols: */ 35 # define Perl_regexec_flags my_regexec 36 # define Perl_regdump my_regdump 37 # define Perl_regprop my_regprop 38 # define Perl_re_intuit_start my_re_intuit_start 39 /* *These* symbols are masked to allow static link. */ 40 # define Perl_pregexec my_pregexec 41 # define Perl_reginitcolors my_reginitcolors 42 # define Perl_regclass_swash my_regclass_swash 43 44 # define PERL_NO_GET_CONTEXT 45 #endif 46 47 /*SUPPRESS 112*/ 48 /* 49 * pregcomp and pregexec -- regsub and regerror are not used in perl 50 * 51 * Copyright (c) 1986 by University of Toronto. 52 * Written by Henry Spencer. Not derived from licensed software. 53 * 54 * Permission is granted to anyone to use this software for any 55 * purpose on any computer system, and to redistribute it freely, 56 * subject to the following restrictions: 57 * 58 * 1. The author is not responsible for the consequences of use of 59 * this software, no matter how awful, even if they arise 60 * from defects in it. 61 * 62 * 2. The origin of this software must not be misrepresented, either 63 * by explicit claim or by omission. 64 * 65 * 3. Altered versions must be plainly marked as such, and must not 66 * be misrepresented as being the original software. 67 * 68 **** Alterations to Henry's code are... 69 **** 70 **** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 71 **** 2000, 2001, 2002, 2003, by Larry Wall and others 72 **** 73 **** You may distribute under the terms of either the GNU General Public 74 **** License or the Artistic License, as specified in the README file. 75 * 76 * Beware that some of this code is subtly aware of the way operator 77 * precedence is structured in regular expressions. Serious changes in 78 * regular-expression syntax might require a total rethink. 79 */ 80 #include "EXTERN.h" 81 #define PERL_IN_REGEXEC_C 82 #include "perl.h" 83 84 #include "regcomp.h" 85 86 #define RF_tainted 1 /* tainted information used? */ 87 #define RF_warned 2 /* warned about big count? */ 88 #define RF_evaled 4 /* Did an EVAL with setting? */ 89 #define RF_utf8 8 /* String contains multibyte chars? */ 90 #define RF_false 16 /* odd number of nested negatives */ 91 92 #define UTF ((PL_reg_flags & RF_utf8) != 0) 93 94 #define RS_init 1 /* eval environment created */ 95 #define RS_set 2 /* replsv value is set */ 96 97 #ifndef STATIC 98 #define STATIC static 99 #endif 100 101 #define REGINCLASS(p,c) (ANYOF_FLAGS(p) ? reginclass(p,c,0,0) : ANYOF_BITMAP_TEST(p,*(c))) 102 103 /* 104 * Forwards. 105 */ 106 107 #define CHR_SVLEN(sv) (do_utf8 ? sv_len_utf8(sv) : SvCUR(sv)) 108 #define CHR_DIST(a,b) (PL_reg_match_utf8 ? utf8_distance(a,b) : a - b) 109 110 #define reghop_c(pos,off) ((char*)reghop((U8*)pos, off)) 111 #define reghopmaybe_c(pos,off) ((char*)reghopmaybe((U8*)pos, off)) 112 #define HOP(pos,off) (PL_reg_match_utf8 ? reghop((U8*)pos, off) : (U8*)(pos + off)) 113 #define HOPMAYBE(pos,off) (PL_reg_match_utf8 ? reghopmaybe((U8*)pos, off) : (U8*)(pos + off)) 114 #define HOPc(pos,off) ((char*)HOP(pos,off)) 115 #define HOPMAYBEc(pos,off) ((char*)HOPMAYBE(pos,off)) 116 117 #define HOPBACK(pos, off) ( \ 118 (PL_reg_match_utf8) \ 119 ? reghopmaybe((U8*)pos, -off) \ 120 : (pos - off >= PL_bostr) \ 121 ? (U8*)(pos - off) \ 122 : (U8*)NULL \ 123 ) 124 #define HOPBACKc(pos, off) (char*)HOPBACK(pos, off) 125 126 #define reghop3_c(pos,off,lim) ((char*)reghop3((U8*)pos, off, (U8*)lim)) 127 #define reghopmaybe3_c(pos,off,lim) ((char*)reghopmaybe3((U8*)pos, off, (U8*)lim)) 128 #define HOP3(pos,off,lim) (PL_reg_match_utf8 ? reghop3((U8*)pos, off, (U8*)lim) : (U8*)(pos + off)) 129 #define HOPMAYBE3(pos,off,lim) (PL_reg_match_utf8 ? reghopmaybe3((U8*)pos, off, (U8*)lim) : (U8*)(pos + off)) 130 #define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim)) 131 #define HOPMAYBE3c(pos,off,lim) ((char*)HOPMAYBE3(pos,off,lim)) 132 133 #define LOAD_UTF8_CHARCLASS(a,b) STMT_START { if (!CAT2(PL_utf8_,a)) { ENTER; save_re_context(); (void)CAT2(is_utf8_, a)((U8*)b); LEAVE; } } STMT_END 134 135 /* for use after a quantifier and before an EXACT-like node -- japhy */ 136 #define JUMPABLE(rn) ( \ 137 OP(rn) == OPEN || OP(rn) == CLOSE || OP(rn) == EVAL || \ 138 OP(rn) == SUSPEND || OP(rn) == IFMATCH || \ 139 OP(rn) == PLUS || OP(rn) == MINMOD || \ 140 (PL_regkind[(U8)OP(rn)] == CURLY && ARG1(rn) > 0) \ 141 ) 142 143 #define HAS_TEXT(rn) ( \ 144 PL_regkind[(U8)OP(rn)] == EXACT || PL_regkind[(U8)OP(rn)] == REF \ 145 ) 146 147 /* 148 Search for mandatory following text node; for lookahead, the text must 149 follow but for lookbehind (rn->flags != 0) we skip to the next step. 150 */ 151 #define FIND_NEXT_IMPT(rn) STMT_START { \ 152 while (JUMPABLE(rn)) \ 153 if (OP(rn) == SUSPEND || PL_regkind[(U8)OP(rn)] == CURLY) \ 154 rn = NEXTOPER(NEXTOPER(rn)); \ 155 else if (OP(rn) == PLUS) \ 156 rn = NEXTOPER(rn); \ 157 else if (OP(rn) == IFMATCH) \ 158 rn = (rn->flags == 0) ? NEXTOPER(NEXTOPER(rn)) : rn + ARG(rn); \ 159 else rn += NEXT_OFF(rn); \ 160 } STMT_END 161 162 static void restore_pos(pTHX_ void *arg); 163 164 STATIC CHECKPOINT 165 S_regcppush(pTHX_ I32 parenfloor) 166 { 167 int retval = PL_savestack_ix; 168 #define REGCP_PAREN_ELEMS 4 169 int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS; 170 int p; 171 172 if (paren_elems_to_push < 0) 173 Perl_croak(aTHX_ "panic: paren_elems_to_push < 0"); 174 175 #define REGCP_OTHER_ELEMS 6 176 SSGROW(paren_elems_to_push + REGCP_OTHER_ELEMS); 177 for (p = PL_regsize; p > parenfloor; p--) { 178 /* REGCP_PARENS_ELEMS are pushed per pairs of parentheses. */ 179 SSPUSHINT(PL_regendp[p]); 180 SSPUSHINT(PL_regstartp[p]); 181 SSPUSHPTR(PL_reg_start_tmp[p]); 182 SSPUSHINT(p); 183 } 184 /* REGCP_OTHER_ELEMS are pushed in any case, parentheses or no. */ 185 SSPUSHINT(PL_regsize); 186 SSPUSHINT(*PL_reglastparen); 187 SSPUSHINT(*PL_reglastcloseparen); 188 SSPUSHPTR(PL_reginput); 189 #define REGCP_FRAME_ELEMS 2 190 /* REGCP_FRAME_ELEMS are part of the REGCP_OTHER_ELEMS and 191 * are needed for the regexp context stack bookkeeping. */ 192 SSPUSHINT(paren_elems_to_push + REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS); 193 SSPUSHINT(SAVEt_REGCONTEXT); /* Magic cookie. */ 194 195 return retval; 196 } 197 198 /* These are needed since we do not localize EVAL nodes: */ 199 # define REGCP_SET(cp) DEBUG_r(PerlIO_printf(Perl_debug_log, \ 200 " Setting an EVAL scope, savestack=%"IVdf"\n", \ 201 (IV)PL_savestack_ix)); cp = PL_savestack_ix 202 203 # define REGCP_UNWIND(cp) DEBUG_r(cp != PL_savestack_ix ? \ 204 PerlIO_printf(Perl_debug_log, \ 205 " Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \ 206 (IV)(cp), (IV)PL_savestack_ix) : 0); regcpblow(cp) 207 208 STATIC char * 209 S_regcppop(pTHX) 210 { 211 I32 i; 212 U32 paren = 0; 213 char *input; 214 I32 tmps; 215 216 /* Pop REGCP_OTHER_ELEMS before the parentheses loop starts. */ 217 i = SSPOPINT; 218 assert(i == SAVEt_REGCONTEXT); /* Check that the magic cookie is there. */ 219 i = SSPOPINT; /* Parentheses elements to pop. */ 220 input = (char *) SSPOPPTR; 221 *PL_reglastcloseparen = SSPOPINT; 222 *PL_reglastparen = SSPOPINT; 223 PL_regsize = SSPOPINT; 224 225 /* Now restore the parentheses context. */ 226 for (i -= (REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS); 227 i > 0; i -= REGCP_PAREN_ELEMS) { 228 paren = (U32)SSPOPINT; 229 PL_reg_start_tmp[paren] = (char *) SSPOPPTR; 230 PL_regstartp[paren] = SSPOPINT; 231 tmps = SSPOPINT; 232 if (paren <= *PL_reglastparen) 233 PL_regendp[paren] = tmps; 234 DEBUG_r( 235 PerlIO_printf(Perl_debug_log, 236 " restoring \\%"UVuf" to %"IVdf"(%"IVdf")..%"IVdf"%s\n", 237 (UV)paren, (IV)PL_regstartp[paren], 238 (IV)(PL_reg_start_tmp[paren] - PL_bostr), 239 (IV)PL_regendp[paren], 240 (paren > *PL_reglastparen ? "(no)" : "")); 241 ); 242 } 243 DEBUG_r( 244 if ((I32)(*PL_reglastparen + 1) <= PL_regnpar) { 245 PerlIO_printf(Perl_debug_log, 246 " restoring \\%"IVdf"..\\%"IVdf" to undef\n", 247 (IV)(*PL_reglastparen + 1), (IV)PL_regnpar); 248 } 249 ); 250 #if 1 251 /* It would seem that the similar code in regtry() 252 * already takes care of this, and in fact it is in 253 * a better location to since this code can #if 0-ed out 254 * but the code in regtry() is needed or otherwise tests 255 * requiring null fields (pat.t#187 and split.t#{13,14} 256 * (as of patchlevel 7877) will fail. Then again, 257 * this code seems to be necessary or otherwise 258 * building DynaLoader will fail: 259 * "Error: '*' not in typemap in DynaLoader.xs, line 164" 260 * --jhi */ 261 for (paren = *PL_reglastparen + 1; (I32)paren <= PL_regnpar; paren++) { 262 if ((I32)paren > PL_regsize) 263 PL_regstartp[paren] = -1; 264 PL_regendp[paren] = -1; 265 } 266 #endif 267 return input; 268 } 269 270 STATIC char * 271 S_regcp_set_to(pTHX_ I32 ss) 272 { 273 I32 tmp = PL_savestack_ix; 274 275 PL_savestack_ix = ss; 276 regcppop(); 277 PL_savestack_ix = tmp; 278 return Nullch; 279 } 280 281 typedef struct re_cc_state 282 { 283 I32 ss; 284 regnode *node; 285 struct re_cc_state *prev; 286 CURCUR *cc; 287 regexp *re; 288 } re_cc_state; 289 290 #define regcpblow(cp) LEAVE_SCOPE(cp) /* Ignores regcppush()ed data. */ 291 292 #define TRYPAREN(paren, n, input) { \ 293 if (paren) { \ 294 if (n) { \ 295 PL_regstartp[paren] = HOPc(input, -1) - PL_bostr; \ 296 PL_regendp[paren] = input - PL_bostr; \ 297 } \ 298 else \ 299 PL_regendp[paren] = -1; \ 300 } \ 301 if (regmatch(next)) \ 302 sayYES; \ 303 if (paren && n) \ 304 PL_regendp[paren] = -1; \ 305 } 306 307 308 /* 309 * pregexec and friends 310 */ 311 312 /* 313 - pregexec - match a regexp against a string 314 */ 315 I32 316 Perl_pregexec(pTHX_ register regexp *prog, char *stringarg, register char *strend, 317 char *strbeg, I32 minend, SV *screamer, U32 nosave) 318 /* strend: pointer to null at end of string */ 319 /* strbeg: real beginning of string */ 320 /* minend: end of match must be >=minend after stringarg. */ 321 /* nosave: For optimizations. */ 322 { 323 return 324 regexec_flags(prog, stringarg, strend, strbeg, minend, screamer, NULL, 325 nosave ? 0 : REXEC_COPY_STR); 326 } 327 328 STATIC void 329 S_cache_re(pTHX_ regexp *prog) 330 { 331 PL_regprecomp = prog->precomp; /* Needed for FAIL. */ 332 #ifdef DEBUGGING 333 PL_regprogram = prog->program; 334 #endif 335 PL_regnpar = prog->nparens; 336 PL_regdata = prog->data; 337 PL_reg_re = prog; 338 } 339 340 /* 341 * Need to implement the following flags for reg_anch: 342 * 343 * USE_INTUIT_NOML - Useful to call re_intuit_start() first 344 * USE_INTUIT_ML 345 * INTUIT_AUTORITATIVE_NOML - Can trust a positive answer 346 * INTUIT_AUTORITATIVE_ML 347 * INTUIT_ONCE_NOML - Intuit can match in one location only. 348 * INTUIT_ONCE_ML 349 * 350 * Another flag for this function: SECOND_TIME (so that float substrs 351 * with giant delta may be not rechecked). 352 */ 353 354 /* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */ 355 356 /* If SCREAM, then SvPVX(sv) should be compatible with strpos and strend. 357 Otherwise, only SvCUR(sv) is used to get strbeg. */ 358 359 /* XXXX We assume that strpos is strbeg unless sv. */ 360 361 /* XXXX Some places assume that there is a fixed substring. 362 An update may be needed if optimizer marks as "INTUITable" 363 RExen without fixed substrings. Similarly, it is assumed that 364 lengths of all the strings are no more than minlen, thus they 365 cannot come from lookahead. 366 (Or minlen should take into account lookahead.) */ 367 368 /* A failure to find a constant substring means that there is no need to make 369 an expensive call to REx engine, thus we celebrate a failure. Similarly, 370 finding a substring too deep into the string means that less calls to 371 regtry() should be needed. 372 373 REx compiler's optimizer found 4 possible hints: 374 a) Anchored substring; 375 b) Fixed substring; 376 c) Whether we are anchored (beginning-of-line or \G); 377 d) First node (of those at offset 0) which may distingush positions; 378 We use a)b)d) and multiline-part of c), and try to find a position in the 379 string which does not contradict any of them. 380 */ 381 382 /* Most of decisions we do here should have been done at compile time. 383 The nodes of the REx which we used for the search should have been 384 deleted from the finite automaton. */ 385 386 char * 387 Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos, 388 char *strend, U32 flags, re_scream_pos_data *data) 389 { 390 register I32 start_shift = 0; 391 /* Should be nonnegative! */ 392 register I32 end_shift = 0; 393 register char *s; 394 register SV *check; 395 char *strbeg; 396 char *t; 397 int do_utf8 = sv ? SvUTF8(sv) : 0; /* if no sv we have to assume bytes */ 398 I32 ml_anch; 399 register char *other_last = Nullch; /* other substr checked before this */ 400 char *check_at = Nullch; /* check substr found at this pos */ 401 #ifdef DEBUGGING 402 char *i_strpos = strpos; 403 SV *dsv = PERL_DEBUG_PAD_ZERO(0); 404 #endif 405 RX_MATCH_UTF8_set(prog,do_utf8); 406 407 if (prog->reganch & ROPT_UTF8) { 408 DEBUG_r(PerlIO_printf(Perl_debug_log, 409 "UTF-8 regex...\n")); 410 PL_reg_flags |= RF_utf8; 411 } 412 413 DEBUG_r({ 414 char *s = PL_reg_match_utf8 ? 415 sv_uni_display(dsv, sv, 60, UNI_DISPLAY_REGEX) : 416 strpos; 417 int len = PL_reg_match_utf8 ? 418 strlen(s) : strend - strpos; 419 if (!PL_colorset) 420 reginitcolors(); 421 if (PL_reg_match_utf8) 422 DEBUG_r(PerlIO_printf(Perl_debug_log, 423 "UTF-8 target...\n")); 424 PerlIO_printf(Perl_debug_log, 425 "%sGuessing start of match, REx%s `%s%.60s%s%s' against `%s%.*s%s%s'...\n", 426 PL_colors[4],PL_colors[5],PL_colors[0], 427 prog->precomp, 428 PL_colors[1], 429 (strlen(prog->precomp) > 60 ? "..." : ""), 430 PL_colors[0], 431 (int)(len > 60 ? 60 : len), 432 s, PL_colors[1], 433 (len > 60 ? "..." : "") 434 ); 435 }); 436 437 /* CHR_DIST() would be more correct here but it makes things slow. */ 438 if (prog->minlen > strend - strpos) { 439 DEBUG_r(PerlIO_printf(Perl_debug_log, 440 "String too short... [re_intuit_start]\n")); 441 goto fail; 442 } 443 strbeg = (sv && SvPOK(sv)) ? strend - SvCUR(sv) : strpos; 444 PL_regeol = strend; 445 if (do_utf8) { 446 if (!prog->check_utf8 && prog->check_substr) 447 to_utf8_substr(prog); 448 check = prog->check_utf8; 449 } else { 450 if (!prog->check_substr && prog->check_utf8) 451 to_byte_substr(prog); 452 check = prog->check_substr; 453 } 454 if (check == &PL_sv_undef) { 455 DEBUG_r(PerlIO_printf(Perl_debug_log, 456 "Non-utf string cannot match utf check string\n")); 457 goto fail; 458 } 459 if (prog->reganch & ROPT_ANCH) { /* Match at beg-of-str or after \n */ 460 ml_anch = !( (prog->reganch & ROPT_ANCH_SINGLE) 461 || ( (prog->reganch & ROPT_ANCH_BOL) 462 && !PL_multiline ) ); /* Check after \n? */ 463 464 if (!ml_anch) { 465 if ( !(prog->reganch & (ROPT_ANCH_GPOS /* Checked by the caller */ 466 | ROPT_IMPLICIT)) /* not a real BOL */ 467 /* SvCUR is not set on references: SvRV and SvPVX overlap */ 468 && sv && !SvROK(sv) 469 && (strpos != strbeg)) { 470 DEBUG_r(PerlIO_printf(Perl_debug_log, "Not at start...\n")); 471 goto fail; 472 } 473 if (prog->check_offset_min == prog->check_offset_max && 474 !(prog->reganch & ROPT_CANY_SEEN)) { 475 /* Substring at constant offset from beg-of-str... */ 476 I32 slen; 477 478 s = HOP3c(strpos, prog->check_offset_min, strend); 479 if (SvTAIL(check)) { 480 slen = SvCUR(check); /* >= 1 */ 481 482 if ( strend - s > slen || strend - s < slen - 1 483 || (strend - s == slen && strend[-1] != '\n')) { 484 DEBUG_r(PerlIO_printf(Perl_debug_log, "String too long...\n")); 485 goto fail_finish; 486 } 487 /* Now should match s[0..slen-2] */ 488 slen--; 489 if (slen && (*SvPVX(check) != *s 490 || (slen > 1 491 && memNE(SvPVX(check), s, slen)))) { 492 report_neq: 493 DEBUG_r(PerlIO_printf(Perl_debug_log, "String not equal...\n")); 494 goto fail_finish; 495 } 496 } 497 else if (*SvPVX(check) != *s 498 || ((slen = SvCUR(check)) > 1 499 && memNE(SvPVX(check), s, slen))) 500 goto report_neq; 501 goto success_at_start; 502 } 503 } 504 /* Match is anchored, but substr is not anchored wrt beg-of-str. */ 505 s = strpos; 506 start_shift = prog->check_offset_min; /* okay to underestimate on CC */ 507 end_shift = prog->minlen - start_shift - 508 CHR_SVLEN(check) + (SvTAIL(check) != 0); 509 if (!ml_anch) { 510 I32 end = prog->check_offset_max + CHR_SVLEN(check) 511 - (SvTAIL(check) != 0); 512 I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end; 513 514 if (end_shift < eshift) 515 end_shift = eshift; 516 } 517 } 518 else { /* Can match at random position */ 519 ml_anch = 0; 520 s = strpos; 521 start_shift = prog->check_offset_min; /* okay to underestimate on CC */ 522 /* Should be nonnegative! */ 523 end_shift = prog->minlen - start_shift - 524 CHR_SVLEN(check) + (SvTAIL(check) != 0); 525 } 526 527 #ifdef DEBUGGING /* 7/99: reports of failure (with the older version) */ 528 if (end_shift < 0) 529 Perl_croak(aTHX_ "panic: end_shift"); 530 #endif 531 532 restart: 533 /* Find a possible match in the region s..strend by looking for 534 the "check" substring in the region corrected by start/end_shift. */ 535 if (flags & REXEC_SCREAM) { 536 I32 p = -1; /* Internal iterator of scream. */ 537 I32 *pp = data ? data->scream_pos : &p; 538 539 if (PL_screamfirst[BmRARE(check)] >= 0 540 || ( BmRARE(check) == '\n' 541 && (BmPREVIOUS(check) == SvCUR(check) - 1) 542 && SvTAIL(check) )) 543 s = screaminstr(sv, check, 544 start_shift + (s - strbeg), end_shift, pp, 0); 545 else 546 goto fail_finish; 547 /* we may be pointing at the wrong string */ 548 if (s && RX_MATCH_COPIED(prog)) 549 s = strbeg + (s - SvPVX(sv)); 550 if (data) 551 *data->scream_olds = s; 552 } 553 else if (prog->reganch & ROPT_CANY_SEEN) 554 s = fbm_instr((U8*)(s + start_shift), 555 (U8*)(strend - end_shift), 556 check, PL_multiline ? FBMrf_MULTILINE : 0); 557 else 558 s = fbm_instr(HOP3(s, start_shift, strend), 559 HOP3(strend, -end_shift, strbeg), 560 check, PL_multiline ? FBMrf_MULTILINE : 0); 561 562 /* Update the count-of-usability, remove useless subpatterns, 563 unshift s. */ 564 565 DEBUG_r(PerlIO_printf(Perl_debug_log, "%s %s substr `%s%.*s%s'%s%s", 566 (s ? "Found" : "Did not find"), 567 (check == (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) ? "anchored" : "floating"), 568 PL_colors[0], 569 (int)(SvCUR(check) - (SvTAIL(check)!=0)), 570 SvPVX(check), 571 PL_colors[1], (SvTAIL(check) ? "$" : ""), 572 (s ? " at offset " : "...\n") ) ); 573 574 if (!s) 575 goto fail_finish; 576 577 check_at = s; 578 579 /* Finish the diagnostic message */ 580 DEBUG_r(PerlIO_printf(Perl_debug_log, "%ld...\n", (long)(s - i_strpos)) ); 581 582 /* Got a candidate. Check MBOL anchoring, and the *other* substr. 583 Start with the other substr. 584 XXXX no SCREAM optimization yet - and a very coarse implementation 585 XXXX /ttx+/ results in anchored=`ttx', floating=`x'. floating will 586 *always* match. Probably should be marked during compile... 587 Probably it is right to do no SCREAM here... 588 */ 589 590 if (do_utf8 ? (prog->float_utf8 && prog->anchored_utf8) : (prog->float_substr && prog->anchored_substr)) { 591 /* Take into account the "other" substring. */ 592 /* XXXX May be hopelessly wrong for UTF... */ 593 if (!other_last) 594 other_last = strpos; 595 if (check == (do_utf8 ? prog->float_utf8 : prog->float_substr)) { 596 do_other_anchored: 597 { 598 char *last = HOP3c(s, -start_shift, strbeg), *last1, *last2; 599 char *s1 = s; 600 SV* must; 601 602 t = s - prog->check_offset_max; 603 if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */ 604 && (!do_utf8 605 || ((t = reghopmaybe3_c(s, -(prog->check_offset_max), strpos)) 606 && t > strpos))) 607 /* EMPTY */; 608 else 609 t = strpos; 610 t = HOP3c(t, prog->anchored_offset, strend); 611 if (t < other_last) /* These positions already checked */ 612 t = other_last; 613 last2 = last1 = HOP3c(strend, -prog->minlen, strbeg); 614 if (last < last1) 615 last1 = last; 616 /* XXXX It is not documented what units *_offsets are in. Assume bytes. */ 617 /* On end-of-str: see comment below. */ 618 must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr; 619 if (must == &PL_sv_undef) { 620 s = (char*)NULL; 621 DEBUG_r(must = prog->anchored_utf8); /* for debug */ 622 } 623 else 624 s = fbm_instr( 625 (unsigned char*)t, 626 HOP3(HOP3(last1, prog->anchored_offset, strend) 627 + SvCUR(must), -(SvTAIL(must)!=0), strbeg), 628 must, 629 PL_multiline ? FBMrf_MULTILINE : 0 630 ); 631 DEBUG_r(PerlIO_printf(Perl_debug_log, 632 "%s anchored substr `%s%.*s%s'%s", 633 (s ? "Found" : "Contradicts"), 634 PL_colors[0], 635 (int)(SvCUR(must) 636 - (SvTAIL(must)!=0)), 637 SvPVX(must), 638 PL_colors[1], (SvTAIL(must) ? "$" : ""))); 639 if (!s) { 640 if (last1 >= last2) { 641 DEBUG_r(PerlIO_printf(Perl_debug_log, 642 ", giving up...\n")); 643 goto fail_finish; 644 } 645 DEBUG_r(PerlIO_printf(Perl_debug_log, 646 ", trying floating at offset %ld...\n", 647 (long)(HOP3c(s1, 1, strend) - i_strpos))); 648 other_last = HOP3c(last1, prog->anchored_offset+1, strend); 649 s = HOP3c(last, 1, strend); 650 goto restart; 651 } 652 else { 653 DEBUG_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n", 654 (long)(s - i_strpos))); 655 t = HOP3c(s, -prog->anchored_offset, strbeg); 656 other_last = HOP3c(s, 1, strend); 657 s = s1; 658 if (t == strpos) 659 goto try_at_start; 660 goto try_at_offset; 661 } 662 } 663 } 664 else { /* Take into account the floating substring. */ 665 char *last, *last1; 666 char *s1 = s; 667 SV* must; 668 669 t = HOP3c(s, -start_shift, strbeg); 670 last1 = last = 671 HOP3c(strend, -prog->minlen + prog->float_min_offset, strbeg); 672 if (CHR_DIST((U8*)last, (U8*)t) > prog->float_max_offset) 673 last = HOP3c(t, prog->float_max_offset, strend); 674 s = HOP3c(t, prog->float_min_offset, strend); 675 if (s < other_last) 676 s = other_last; 677 /* XXXX It is not documented what units *_offsets are in. Assume bytes. */ 678 must = do_utf8 ? prog->float_utf8 : prog->float_substr; 679 /* fbm_instr() takes into account exact value of end-of-str 680 if the check is SvTAIL(ed). Since false positives are OK, 681 and end-of-str is not later than strend we are OK. */ 682 if (must == &PL_sv_undef) { 683 s = (char*)NULL; 684 DEBUG_r(must = prog->float_utf8); /* for debug message */ 685 } 686 else 687 s = fbm_instr((unsigned char*)s, 688 (unsigned char*)last + SvCUR(must) 689 - (SvTAIL(must)!=0), 690 must, PL_multiline ? FBMrf_MULTILINE : 0); 691 DEBUG_r(PerlIO_printf(Perl_debug_log, "%s floating substr `%s%.*s%s'%s", 692 (s ? "Found" : "Contradicts"), 693 PL_colors[0], 694 (int)(SvCUR(must) - (SvTAIL(must)!=0)), 695 SvPVX(must), 696 PL_colors[1], (SvTAIL(must) ? "$" : ""))); 697 if (!s) { 698 if (last1 == last) { 699 DEBUG_r(PerlIO_printf(Perl_debug_log, 700 ", giving up...\n")); 701 goto fail_finish; 702 } 703 DEBUG_r(PerlIO_printf(Perl_debug_log, 704 ", trying anchored starting at offset %ld...\n", 705 (long)(s1 + 1 - i_strpos))); 706 other_last = last; 707 s = HOP3c(t, 1, strend); 708 goto restart; 709 } 710 else { 711 DEBUG_r(PerlIO_printf(Perl_debug_log, " at offset %ld...\n", 712 (long)(s - i_strpos))); 713 other_last = s; /* Fix this later. --Hugo */ 714 s = s1; 715 if (t == strpos) 716 goto try_at_start; 717 goto try_at_offset; 718 } 719 } 720 } 721 722 t = s - prog->check_offset_max; 723 if (s - strpos > prog->check_offset_max /* signed-corrected t > strpos */ 724 && (!do_utf8 725 || ((t = reghopmaybe3_c(s, -prog->check_offset_max, strpos)) 726 && t > strpos))) { 727 /* Fixed substring is found far enough so that the match 728 cannot start at strpos. */ 729 try_at_offset: 730 if (ml_anch && t[-1] != '\n') { 731 /* Eventually fbm_*() should handle this, but often 732 anchored_offset is not 0, so this check will not be wasted. */ 733 /* XXXX In the code below we prefer to look for "^" even in 734 presence of anchored substrings. And we search even 735 beyond the found float position. These pessimizations 736 are historical artefacts only. */ 737 find_anchor: 738 while (t < strend - prog->minlen) { 739 if (*t == '\n') { 740 if (t < check_at - prog->check_offset_min) { 741 if (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) { 742 /* Since we moved from the found position, 743 we definitely contradict the found anchored 744 substr. Due to the above check we do not 745 contradict "check" substr. 746 Thus we can arrive here only if check substr 747 is float. Redo checking for "other"=="fixed". 748 */ 749 strpos = t + 1; 750 DEBUG_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld, rescanning for anchored from offset %ld...\n", 751 PL_colors[0],PL_colors[1], (long)(strpos - i_strpos), (long)(strpos - i_strpos + prog->anchored_offset))); 752 goto do_other_anchored; 753 } 754 /* We don't contradict the found floating substring. */ 755 /* XXXX Why not check for STCLASS? */ 756 s = t + 1; 757 DEBUG_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m at offset %ld...\n", 758 PL_colors[0],PL_colors[1], (long)(s - i_strpos))); 759 goto set_useful; 760 } 761 /* Position contradicts check-string */ 762 /* XXXX probably better to look for check-string 763 than for "\n", so one should lower the limit for t? */ 764 DEBUG_r(PerlIO_printf(Perl_debug_log, "Found /%s^%s/m, restarting lookup for check-string at offset %ld...\n", 765 PL_colors[0],PL_colors[1], (long)(t + 1 - i_strpos))); 766 other_last = strpos = s = t + 1; 767 goto restart; 768 } 769 t++; 770 } 771 DEBUG_r(PerlIO_printf(Perl_debug_log, "Did not find /%s^%s/m...\n", 772 PL_colors[0],PL_colors[1])); 773 goto fail_finish; 774 } 775 else { 776 DEBUG_r(PerlIO_printf(Perl_debug_log, "Starting position does not contradict /%s^%s/m...\n", 777 PL_colors[0],PL_colors[1])); 778 } 779 s = t; 780 set_useful: 781 ++BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr); /* hooray/5 */ 782 } 783 else { 784 /* The found string does not prohibit matching at strpos, 785 - no optimization of calling REx engine can be performed, 786 unless it was an MBOL and we are not after MBOL, 787 or a future STCLASS check will fail this. */ 788 try_at_start: 789 /* Even in this situation we may use MBOL flag if strpos is offset 790 wrt the start of the string. */ 791 if (ml_anch && sv && !SvROK(sv) /* See prev comment on SvROK */ 792 && (strpos != strbeg) && strpos[-1] != '\n' 793 /* May be due to an implicit anchor of m{.*foo} */ 794 && !(prog->reganch & ROPT_IMPLICIT)) 795 { 796 t = strpos; 797 goto find_anchor; 798 } 799 DEBUG_r( if (ml_anch) 800 PerlIO_printf(Perl_debug_log, "Position at offset %ld does not contradict /%s^%s/m...\n", 801 (long)(strpos - i_strpos), PL_colors[0],PL_colors[1]); 802 ); 803 success_at_start: 804 if (!(prog->reganch & ROPT_NAUGHTY) /* XXXX If strpos moved? */ 805 && (do_utf8 ? ( 806 prog->check_utf8 /* Could be deleted already */ 807 && --BmUSEFUL(prog->check_utf8) < 0 808 && (prog->check_utf8 == prog->float_utf8) 809 ) : ( 810 prog->check_substr /* Could be deleted already */ 811 && --BmUSEFUL(prog->check_substr) < 0 812 && (prog->check_substr == prog->float_substr) 813 ))) 814 { 815 /* If flags & SOMETHING - do not do it many times on the same match */ 816 DEBUG_r(PerlIO_printf(Perl_debug_log, "... Disabling check substring...\n")); 817 SvREFCNT_dec(do_utf8 ? prog->check_utf8 : prog->check_substr); 818 if (do_utf8 ? prog->check_substr : prog->check_utf8) 819 SvREFCNT_dec(do_utf8 ? prog->check_substr : prog->check_utf8); 820 prog->check_substr = prog->check_utf8 = Nullsv; /* disable */ 821 prog->float_substr = prog->float_utf8 = Nullsv; /* clear */ 822 check = Nullsv; /* abort */ 823 s = strpos; 824 /* XXXX This is a remnant of the old implementation. It 825 looks wasteful, since now INTUIT can use many 826 other heuristics. */ 827 prog->reganch &= ~RE_USE_INTUIT; 828 } 829 else 830 s = strpos; 831 } 832 833 /* Last resort... */ 834 /* XXXX BmUSEFUL already changed, maybe multiple change is meaningful... */ 835 if (prog->regstclass) { 836 /* minlen == 0 is possible if regstclass is \b or \B, 837 and the fixed substr is ''$. 838 Since minlen is already taken into account, s+1 is before strend; 839 accidentally, minlen >= 1 guaranties no false positives at s + 1 840 even for \b or \B. But (minlen? 1 : 0) below assumes that 841 regstclass does not come from lookahead... */ 842 /* If regstclass takes bytelength more than 1: If charlength==1, OK. 843 This leaves EXACTF only, which is dealt with in find_byclass(). */ 844 U8* str = (U8*)STRING(prog->regstclass); 845 int cl_l = (PL_regkind[(U8)OP(prog->regstclass)] == EXACT 846 ? CHR_DIST(str+STR_LEN(prog->regstclass), str) 847 : 1); 848 char *endpos = (prog->anchored_substr || prog->anchored_utf8 || ml_anch) 849 ? HOP3c(s, (prog->minlen ? cl_l : 0), strend) 850 : (prog->float_substr || prog->float_utf8 851 ? HOP3c(HOP3c(check_at, -start_shift, strbeg), 852 cl_l, strend) 853 : strend); 854 char *startpos = strbeg; 855 856 t = s; 857 cache_re(prog); 858 s = find_byclass(prog, prog->regstclass, s, endpos, startpos, 1); 859 if (!s) { 860 #ifdef DEBUGGING 861 char *what = 0; 862 #endif 863 if (endpos == strend) { 864 DEBUG_r( PerlIO_printf(Perl_debug_log, 865 "Could not match STCLASS...\n") ); 866 goto fail; 867 } 868 DEBUG_r( PerlIO_printf(Perl_debug_log, 869 "This position contradicts STCLASS...\n") ); 870 if ((prog->reganch & ROPT_ANCH) && !ml_anch) 871 goto fail; 872 /* Contradict one of substrings */ 873 if (prog->anchored_substr || prog->anchored_utf8) { 874 if ((do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) == check) { 875 DEBUG_r( what = "anchored" ); 876 hop_and_restart: 877 s = HOP3c(t, 1, strend); 878 if (s + start_shift + end_shift > strend) { 879 /* XXXX Should be taken into account earlier? */ 880 DEBUG_r( PerlIO_printf(Perl_debug_log, 881 "Could not match STCLASS...\n") ); 882 goto fail; 883 } 884 if (!check) 885 goto giveup; 886 DEBUG_r( PerlIO_printf(Perl_debug_log, 887 "Looking for %s substr starting at offset %ld...\n", 888 what, (long)(s + start_shift - i_strpos)) ); 889 goto restart; 890 } 891 /* Have both, check_string is floating */ 892 if (t + start_shift >= check_at) /* Contradicts floating=check */ 893 goto retry_floating_check; 894 /* Recheck anchored substring, but not floating... */ 895 s = check_at; 896 if (!check) 897 goto giveup; 898 DEBUG_r( PerlIO_printf(Perl_debug_log, 899 "Looking for anchored substr starting at offset %ld...\n", 900 (long)(other_last - i_strpos)) ); 901 goto do_other_anchored; 902 } 903 /* Another way we could have checked stclass at the 904 current position only: */ 905 if (ml_anch) { 906 s = t = t + 1; 907 if (!check) 908 goto giveup; 909 DEBUG_r( PerlIO_printf(Perl_debug_log, 910 "Looking for /%s^%s/m starting at offset %ld...\n", 911 PL_colors[0],PL_colors[1], (long)(t - i_strpos)) ); 912 goto try_at_offset; 913 } 914 if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) /* Could have been deleted */ 915 goto fail; 916 /* Check is floating subtring. */ 917 retry_floating_check: 918 t = check_at - start_shift; 919 DEBUG_r( what = "floating" ); 920 goto hop_and_restart; 921 } 922 if (t != s) { 923 DEBUG_r(PerlIO_printf(Perl_debug_log, 924 "By STCLASS: moving %ld --> %ld\n", 925 (long)(t - i_strpos), (long)(s - i_strpos)) 926 ); 927 } 928 else { 929 DEBUG_r(PerlIO_printf(Perl_debug_log, 930 "Does not contradict STCLASS...\n"); 931 ); 932 } 933 } 934 giveup: 935 DEBUG_r(PerlIO_printf(Perl_debug_log, "%s%s:%s match at offset %ld\n", 936 PL_colors[4], (check ? "Guessed" : "Giving up"), 937 PL_colors[5], (long)(s - i_strpos)) ); 938 return s; 939 940 fail_finish: /* Substring not found */ 941 if (prog->check_substr || prog->check_utf8) /* could be removed already */ 942 BmUSEFUL(do_utf8 ? prog->check_utf8 : prog->check_substr) += 5; /* hooray */ 943 fail: 944 DEBUG_r(PerlIO_printf(Perl_debug_log, "%sMatch rejected by optimizer%s\n", 945 PL_colors[4],PL_colors[5])); 946 return Nullch; 947 } 948 949 /* We know what class REx starts with. Try to find this position... */ 950 STATIC char * 951 S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, char *startpos, I32 norun) 952 { 953 I32 doevery = (prog->reganch & ROPT_SKIP) == 0; 954 char *m; 955 STRLEN ln; 956 STRLEN lnc; 957 unsigned int c1; 958 unsigned int c2; 959 char *e; 960 register I32 tmp = 1; /* Scratch variable? */ 961 register bool do_utf8 = PL_reg_match_utf8; 962 963 /* We know what class it must start with. */ 964 switch (OP(c)) { 965 case ANYOF: 966 if (do_utf8) { 967 while (s < strend) { 968 if ((ANYOF_FLAGS(c) & ANYOF_UNICODE) || 969 !UTF8_IS_INVARIANT((U8)s[0]) ? 970 reginclass(c, (U8*)s, 0, do_utf8) : 971 REGINCLASS(c, (U8*)s)) { 972 if (tmp && (norun || regtry(prog, s))) 973 goto got_it; 974 else 975 tmp = doevery; 976 } 977 else 978 tmp = 1; 979 s += UTF8SKIP(s); 980 } 981 } 982 else { 983 while (s < strend) { 984 STRLEN skip = 1; 985 986 if (REGINCLASS(c, (U8*)s) || 987 (ANYOF_FOLD_SHARP_S(c, s, strend) && 988 /* The assignment of 2 is intentional: 989 * for the folded sharp s, the skip is 2. */ 990 (skip = SHARP_S_SKIP))) { 991 if (tmp && (norun || regtry(prog, s))) 992 goto got_it; 993 else 994 tmp = doevery; 995 } 996 else 997 tmp = 1; 998 s += skip; 999 } 1000 } 1001 break; 1002 case CANY: 1003 while (s < strend) { 1004 if (tmp && (norun || regtry(prog, s))) 1005 goto got_it; 1006 else 1007 tmp = doevery; 1008 s++; 1009 } 1010 break; 1011 case EXACTF: 1012 m = STRING(c); 1013 ln = STR_LEN(c); /* length to match in octets/bytes */ 1014 lnc = (I32) ln; /* length to match in characters */ 1015 if (UTF) { 1016 STRLEN ulen1, ulen2; 1017 U8 *sm = (U8 *) m; 1018 U8 tmpbuf1[UTF8_MAXLEN_UCLC+1]; 1019 U8 tmpbuf2[UTF8_MAXLEN_UCLC+1]; 1020 1021 to_utf8_lower((U8*)m, tmpbuf1, &ulen1); 1022 to_utf8_upper((U8*)m, tmpbuf2, &ulen2); 1023 1024 c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXLEN_UCLC, 1025 0, ckWARN(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY); 1026 c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXLEN_UCLC, 1027 0, ckWARN(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY); 1028 lnc = 0; 1029 while (sm < ((U8 *) m + ln)) { 1030 lnc++; 1031 sm += UTF8SKIP(sm); 1032 } 1033 } 1034 else { 1035 c1 = *(U8*)m; 1036 c2 = PL_fold[c1]; 1037 } 1038 goto do_exactf; 1039 case EXACTFL: 1040 m = STRING(c); 1041 ln = STR_LEN(c); 1042 lnc = (I32) ln; 1043 c1 = *(U8*)m; 1044 c2 = PL_fold_locale[c1]; 1045 do_exactf: 1046 e = HOP3c(strend, -((I32)lnc), s); 1047 1048 if (norun && e < s) 1049 e = s; /* Due to minlen logic of intuit() */ 1050 1051 /* The idea in the EXACTF* cases is to first find the 1052 * first character of the EXACTF* node and then, if 1053 * necessary, case-insensitively compare the full 1054 * text of the node. The c1 and c2 are the first 1055 * characters (though in Unicode it gets a bit 1056 * more complicated because there are more cases 1057 * than just upper and lower: one needs to use 1058 * the so-called folding case for case-insensitive 1059 * matching (called "loose matching" in Unicode). 1060 * ibcmp_utf8() will do just that. */ 1061 1062 if (do_utf8) { 1063 UV c, f; 1064 U8 tmpbuf [UTF8_MAXLEN+1]; 1065 U8 foldbuf[UTF8_MAXLEN_FOLD+1]; 1066 STRLEN len, foldlen; 1067 1068 if (c1 == c2) { 1069 /* Upper and lower of 1st char are equal - 1070 * probably not a "letter". */ 1071 while (s <= e) { 1072 c = utf8n_to_uvchr((U8*)s, UTF8_MAXLEN, &len, 1073 ckWARN(WARN_UTF8) ? 1074 0 : UTF8_ALLOW_ANY); 1075 if ( c == c1 1076 && (ln == len || 1077 ibcmp_utf8(s, (char **)0, 0, do_utf8, 1078 m, (char **)0, ln, (bool)UTF)) 1079 && (norun || regtry(prog, s)) ) 1080 goto got_it; 1081 else { 1082 uvchr_to_utf8(tmpbuf, c); 1083 f = to_utf8_fold(tmpbuf, foldbuf, &foldlen); 1084 if ( f != c 1085 && (f == c1 || f == c2) 1086 && (ln == foldlen || 1087 !ibcmp_utf8((char *) foldbuf, 1088 (char **)0, foldlen, do_utf8, 1089 m, 1090 (char **)0, ln, (bool)UTF)) 1091 && (norun || regtry(prog, s)) ) 1092 goto got_it; 1093 } 1094 s += len; 1095 } 1096 } 1097 else { 1098 while (s <= e) { 1099 c = utf8n_to_uvchr((U8*)s, UTF8_MAXLEN, &len, 1100 ckWARN(WARN_UTF8) ? 1101 0 : UTF8_ALLOW_ANY); 1102 1103 /* Handle some of the three Greek sigmas cases. 1104 * Note that not all the possible combinations 1105 * are handled here: some of them are handled 1106 * by the standard folding rules, and some of 1107 * them (the character class or ANYOF cases) 1108 * are handled during compiletime in 1109 * regexec.c:S_regclass(). */ 1110 if (c == (UV)UNICODE_GREEK_CAPITAL_LETTER_SIGMA || 1111 c == (UV)UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA) 1112 c = (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA; 1113 1114 if ( (c == c1 || c == c2) 1115 && (ln == len || 1116 ibcmp_utf8(s, (char **)0, 0, do_utf8, 1117 m, (char **)0, ln, (bool)UTF)) 1118 && (norun || regtry(prog, s)) ) 1119 goto got_it; 1120 else { 1121 uvchr_to_utf8(tmpbuf, c); 1122 f = to_utf8_fold(tmpbuf, foldbuf, &foldlen); 1123 if ( f != c 1124 && (f == c1 || f == c2) 1125 && (ln == foldlen || 1126 !ibcmp_utf8((char *) foldbuf, 1127 (char **)0, foldlen, do_utf8, 1128 m, 1129 (char **)0, ln, (bool)UTF)) 1130 && (norun || regtry(prog, s)) ) 1131 goto got_it; 1132 } 1133 s += len; 1134 } 1135 } 1136 } 1137 else { 1138 if (c1 == c2) 1139 while (s <= e) { 1140 if ( *(U8*)s == c1 1141 && (ln == 1 || !(OP(c) == EXACTF 1142 ? ibcmp(s, m, ln) 1143 : ibcmp_locale(s, m, ln))) 1144 && (norun || regtry(prog, s)) ) 1145 goto got_it; 1146 s++; 1147 } 1148 else 1149 while (s <= e) { 1150 if ( (*(U8*)s == c1 || *(U8*)s == c2) 1151 && (ln == 1 || !(OP(c) == EXACTF 1152 ? ibcmp(s, m, ln) 1153 : ibcmp_locale(s, m, ln))) 1154 && (norun || regtry(prog, s)) ) 1155 goto got_it; 1156 s++; 1157 } 1158 } 1159 break; 1160 case BOUNDL: 1161 PL_reg_flags |= RF_tainted; 1162 /* FALL THROUGH */ 1163 case BOUND: 1164 if (do_utf8) { 1165 if (s == PL_bostr) 1166 tmp = '\n'; 1167 else { 1168 U8 *r = reghop3((U8*)s, -1, (U8*)PL_bostr); 1169 1170 tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, 0); 1171 } 1172 tmp = ((OP(c) == BOUND ? 1173 isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0); 1174 LOAD_UTF8_CHARCLASS(alnum,"a"); 1175 while (s < strend) { 1176 if (tmp == !(OP(c) == BOUND ? 1177 swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) : 1178 isALNUM_LC_utf8((U8*)s))) 1179 { 1180 tmp = !tmp; 1181 if ((norun || regtry(prog, s))) 1182 goto got_it; 1183 } 1184 s += UTF8SKIP(s); 1185 } 1186 } 1187 else { 1188 tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; 1189 tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0); 1190 while (s < strend) { 1191 if (tmp == 1192 !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) { 1193 tmp = !tmp; 1194 if ((norun || regtry(prog, s))) 1195 goto got_it; 1196 } 1197 s++; 1198 } 1199 } 1200 if ((!prog->minlen && tmp) && (norun || regtry(prog, s))) 1201 goto got_it; 1202 break; 1203 case NBOUNDL: 1204 PL_reg_flags |= RF_tainted; 1205 /* FALL THROUGH */ 1206 case NBOUND: 1207 if (do_utf8) { 1208 if (s == PL_bostr) 1209 tmp = '\n'; 1210 else { 1211 U8 *r = reghop3((U8*)s, -1, (U8*)PL_bostr); 1212 1213 tmp = utf8n_to_uvchr(r, UTF8SKIP(r), 0, 0); 1214 } 1215 tmp = ((OP(c) == NBOUND ? 1216 isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0); 1217 LOAD_UTF8_CHARCLASS(alnum,"a"); 1218 while (s < strend) { 1219 if (tmp == !(OP(c) == NBOUND ? 1220 swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) : 1221 isALNUM_LC_utf8((U8*)s))) 1222 tmp = !tmp; 1223 else if ((norun || regtry(prog, s))) 1224 goto got_it; 1225 s += UTF8SKIP(s); 1226 } 1227 } 1228 else { 1229 tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n'; 1230 tmp = ((OP(c) == NBOUND ? 1231 isALNUM(tmp) : isALNUM_LC(tmp)) != 0); 1232 while (s < strend) { 1233 if (tmp == 1234 !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s))) 1235 tmp = !tmp; 1236 else if ((norun || regtry(prog, s))) 1237 goto got_it; 1238 s++; 1239 } 1240 } 1241 if ((!prog->minlen && !tmp) && (norun || regtry(prog, s))) 1242 goto got_it; 1243 break; 1244 case ALNUM: 1245 if (do_utf8) { 1246 LOAD_UTF8_CHARCLASS(alnum,"a"); 1247 while (s < strend) { 1248 if (swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8)) { 1249 if (tmp && (norun || regtry(prog, s))) 1250 goto got_it; 1251 else 1252 tmp = doevery; 1253 } 1254 else 1255 tmp = 1; 1256 s += UTF8SKIP(s); 1257 } 1258 } 1259 else { 1260 while (s < strend) { 1261 if (isALNUM(*s)) { 1262 if (tmp && (norun || regtry(prog, s))) 1263 goto got_it; 1264 else 1265 tmp = doevery; 1266 } 1267 else 1268 tmp = 1; 1269 s++; 1270 } 1271 } 1272 break; 1273 case ALNUML: 1274 PL_reg_flags |= RF_tainted; 1275 if (do_utf8) { 1276 while (s < strend) { 1277 if (isALNUM_LC_utf8((U8*)s)) { 1278 if (tmp && (norun || regtry(prog, s))) 1279 goto got_it; 1280 else 1281 tmp = doevery; 1282 } 1283 else 1284 tmp = 1; 1285 s += UTF8SKIP(s); 1286 } 1287 } 1288 else { 1289 while (s < strend) { 1290 if (isALNUM_LC(*s)) { 1291 if (tmp && (norun || regtry(prog, s))) 1292 goto got_it; 1293 else 1294 tmp = doevery; 1295 } 1296 else 1297 tmp = 1; 1298 s++; 1299 } 1300 } 1301 break; 1302 case NALNUM: 1303 if (do_utf8) { 1304 LOAD_UTF8_CHARCLASS(alnum,"a"); 1305 while (s < strend) { 1306 if (!swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8)) { 1307 if (tmp && (norun || regtry(prog, s))) 1308 goto got_it; 1309 else 1310 tmp = doevery; 1311 } 1312 else 1313 tmp = 1; 1314 s += UTF8SKIP(s); 1315 } 1316 } 1317 else { 1318 while (s < strend) { 1319 if (!isALNUM(*s)) { 1320 if (tmp && (norun || regtry(prog, s))) 1321 goto got_it; 1322 else 1323 tmp = doevery; 1324 } 1325 else 1326 tmp = 1; 1327 s++; 1328 } 1329 } 1330 break; 1331 case NALNUML: 1332 PL_reg_flags |= RF_tainted; 1333 if (do_utf8) { 1334 while (s < strend) { 1335 if (!isALNUM_LC_utf8((U8*)s)) { 1336 if (tmp && (norun || regtry(prog, s))) 1337 goto got_it; 1338 else 1339 tmp = doevery; 1340 } 1341 else 1342 tmp = 1; 1343 s += UTF8SKIP(s); 1344 } 1345 } 1346 else { 1347 while (s < strend) { 1348 if (!isALNUM_LC(*s)) { 1349 if (tmp && (norun || regtry(prog, s))) 1350 goto got_it; 1351 else 1352 tmp = doevery; 1353 } 1354 else 1355 tmp = 1; 1356 s++; 1357 } 1358 } 1359 break; 1360 case SPACE: 1361 if (do_utf8) { 1362 LOAD_UTF8_CHARCLASS(space," "); 1363 while (s < strend) { 1364 if (*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8)) { 1365 if (tmp && (norun || regtry(prog, s))) 1366 goto got_it; 1367 else 1368 tmp = doevery; 1369 } 1370 else 1371 tmp = 1; 1372 s += UTF8SKIP(s); 1373 } 1374 } 1375 else { 1376 while (s < strend) { 1377 if (isSPACE(*s)) { 1378 if (tmp && (norun || regtry(prog, s))) 1379 goto got_it; 1380 else 1381 tmp = doevery; 1382 } 1383 else 1384 tmp = 1; 1385 s++; 1386 } 1387 } 1388 break; 1389 case SPACEL: 1390 PL_reg_flags |= RF_tainted; 1391 if (do_utf8) { 1392 while (s < strend) { 1393 if (*s == ' ' || isSPACE_LC_utf8((U8*)s)) { 1394 if (tmp && (norun || regtry(prog, s))) 1395 goto got_it; 1396 else 1397 tmp = doevery; 1398 } 1399 else 1400 tmp = 1; 1401 s += UTF8SKIP(s); 1402 } 1403 } 1404 else { 1405 while (s < strend) { 1406 if (isSPACE_LC(*s)) { 1407 if (tmp && (norun || regtry(prog, s))) 1408 goto got_it; 1409 else 1410 tmp = doevery; 1411 } 1412 else 1413 tmp = 1; 1414 s++; 1415 } 1416 } 1417 break; 1418 case NSPACE: 1419 if (do_utf8) { 1420 LOAD_UTF8_CHARCLASS(space," "); 1421 while (s < strend) { 1422 if (!(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8))) { 1423 if (tmp && (norun || regtry(prog, s))) 1424 goto got_it; 1425 else 1426 tmp = doevery; 1427 } 1428 else 1429 tmp = 1; 1430 s += UTF8SKIP(s); 1431 } 1432 } 1433 else { 1434 while (s < strend) { 1435 if (!isSPACE(*s)) { 1436 if (tmp && (norun || regtry(prog, s))) 1437 goto got_it; 1438 else 1439 tmp = doevery; 1440 } 1441 else 1442 tmp = 1; 1443 s++; 1444 } 1445 } 1446 break; 1447 case NSPACEL: 1448 PL_reg_flags |= RF_tainted; 1449 if (do_utf8) { 1450 while (s < strend) { 1451 if (!(*s == ' ' || isSPACE_LC_utf8((U8*)s))) { 1452 if (tmp && (norun || regtry(prog, s))) 1453 goto got_it; 1454 else 1455 tmp = doevery; 1456 } 1457 else 1458 tmp = 1; 1459 s += UTF8SKIP(s); 1460 } 1461 } 1462 else { 1463 while (s < strend) { 1464 if (!isSPACE_LC(*s)) { 1465 if (tmp && (norun || regtry(prog, s))) 1466 goto got_it; 1467 else 1468 tmp = doevery; 1469 } 1470 else 1471 tmp = 1; 1472 s++; 1473 } 1474 } 1475 break; 1476 case DIGIT: 1477 if (do_utf8) { 1478 LOAD_UTF8_CHARCLASS(digit,"0"); 1479 while (s < strend) { 1480 if (swash_fetch(PL_utf8_digit,(U8*)s, do_utf8)) { 1481 if (tmp && (norun || regtry(prog, s))) 1482 goto got_it; 1483 else 1484 tmp = doevery; 1485 } 1486 else 1487 tmp = 1; 1488 s += UTF8SKIP(s); 1489 } 1490 } 1491 else { 1492 while (s < strend) { 1493 if (isDIGIT(*s)) { 1494 if (tmp && (norun || regtry(prog, s))) 1495 goto got_it; 1496 else 1497 tmp = doevery; 1498 } 1499 else 1500 tmp = 1; 1501 s++; 1502 } 1503 } 1504 break; 1505 case DIGITL: 1506 PL_reg_flags |= RF_tainted; 1507 if (do_utf8) { 1508 while (s < strend) { 1509 if (isDIGIT_LC_utf8((U8*)s)) { 1510 if (tmp && (norun || regtry(prog, s))) 1511 goto got_it; 1512 else 1513 tmp = doevery; 1514 } 1515 else 1516 tmp = 1; 1517 s += UTF8SKIP(s); 1518 } 1519 } 1520 else { 1521 while (s < strend) { 1522 if (isDIGIT_LC(*s)) { 1523 if (tmp && (norun || regtry(prog, s))) 1524 goto got_it; 1525 else 1526 tmp = doevery; 1527 } 1528 else 1529 tmp = 1; 1530 s++; 1531 } 1532 } 1533 break; 1534 case NDIGIT: 1535 if (do_utf8) { 1536 LOAD_UTF8_CHARCLASS(digit,"0"); 1537 while (s < strend) { 1538 if (!swash_fetch(PL_utf8_digit,(U8*)s, do_utf8)) { 1539 if (tmp && (norun || regtry(prog, s))) 1540 goto got_it; 1541 else 1542 tmp = doevery; 1543 } 1544 else 1545 tmp = 1; 1546 s += UTF8SKIP(s); 1547 } 1548 } 1549 else { 1550 while (s < strend) { 1551 if (!isDIGIT(*s)) { 1552 if (tmp && (norun || regtry(prog, s))) 1553 goto got_it; 1554 else 1555 tmp = doevery; 1556 } 1557 else 1558 tmp = 1; 1559 s++; 1560 } 1561 } 1562 break; 1563 case NDIGITL: 1564 PL_reg_flags |= RF_tainted; 1565 if (do_utf8) { 1566 while (s < strend) { 1567 if (!isDIGIT_LC_utf8((U8*)s)) { 1568 if (tmp && (norun || regtry(prog, s))) 1569 goto got_it; 1570 else 1571 tmp = doevery; 1572 } 1573 else 1574 tmp = 1; 1575 s += UTF8SKIP(s); 1576 } 1577 } 1578 else { 1579 while (s < strend) { 1580 if (!isDIGIT_LC(*s)) { 1581 if (tmp && (norun || regtry(prog, s))) 1582 goto got_it; 1583 else 1584 tmp = doevery; 1585 } 1586 else 1587 tmp = 1; 1588 s++; 1589 } 1590 } 1591 break; 1592 default: 1593 Perl_croak(aTHX_ "panic: unknown regstclass %d", (int)OP(c)); 1594 break; 1595 } 1596 return 0; 1597 got_it: 1598 return s; 1599 } 1600 1601 /* 1602 - regexec_flags - match a regexp against a string 1603 */ 1604 I32 1605 Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *strend, 1606 char *strbeg, I32 minend, SV *sv, void *data, U32 flags) 1607 /* strend: pointer to null at end of string */ 1608 /* strbeg: real beginning of string */ 1609 /* minend: end of match must be >=minend after stringarg. */ 1610 /* data: May be used for some additional optimizations. */ 1611 /* nosave: For optimizations. */ 1612 { 1613 register char *s; 1614 register regnode *c; 1615 register char *startpos = stringarg; 1616 I32 minlen; /* must match at least this many chars */ 1617 I32 dontbother = 0; /* how many characters not to try at end */ 1618 /* I32 start_shift = 0; */ /* Offset of the start to find 1619 constant substr. */ /* CC */ 1620 I32 end_shift = 0; /* Same for the end. */ /* CC */ 1621 I32 scream_pos = -1; /* Internal iterator of scream. */ 1622 char *scream_olds; 1623 SV* oreplsv = GvSV(PL_replgv); 1624 bool do_utf8 = DO_UTF8(sv); 1625 #ifdef DEBUGGING 1626 SV *dsv0 = PERL_DEBUG_PAD_ZERO(0); 1627 SV *dsv1 = PERL_DEBUG_PAD_ZERO(1); 1628 #endif 1629 RX_MATCH_UTF8_set(prog,do_utf8); 1630 1631 PL_regcc = 0; 1632 1633 cache_re(prog); 1634 #ifdef DEBUGGING 1635 PL_regnarrate = DEBUG_r_TEST; 1636 #endif 1637 1638 /* Be paranoid... */ 1639 if (prog == NULL || startpos == NULL) { 1640 Perl_croak(aTHX_ "NULL regexp parameter"); 1641 return 0; 1642 } 1643 1644 minlen = prog->minlen; 1645 if (strend - startpos < minlen) { 1646 DEBUG_r(PerlIO_printf(Perl_debug_log, 1647 "String too short [regexec_flags]...\n")); 1648 goto phooey; 1649 } 1650 1651 /* Check validity of program. */ 1652 if (UCHARAT(prog->program) != REG_MAGIC) { 1653 Perl_croak(aTHX_ "corrupted regexp program"); 1654 } 1655 1656 PL_reg_flags = 0; 1657 PL_reg_eval_set = 0; 1658 PL_reg_maxiter = 0; 1659 1660 if (prog->reganch & ROPT_UTF8) 1661 PL_reg_flags |= RF_utf8; 1662 1663 /* Mark beginning of line for ^ and lookbehind. */ 1664 PL_regbol = startpos; 1665 PL_bostr = strbeg; 1666 PL_reg_sv = sv; 1667 1668 /* Mark end of line for $ (and such) */ 1669 PL_regeol = strend; 1670 1671 /* see how far we have to get to not match where we matched before */ 1672 PL_regtill = startpos+minend; 1673 1674 /* We start without call_cc context. */ 1675 PL_reg_call_cc = 0; 1676 1677 /* If there is a "must appear" string, look for it. */ 1678 s = startpos; 1679 1680 if (prog->reganch & ROPT_GPOS_SEEN) { /* Need to have PL_reg_ganch */ 1681 MAGIC *mg; 1682 1683 if (flags & REXEC_IGNOREPOS) /* Means: check only at start */ 1684 PL_reg_ganch = startpos; 1685 else if (sv && SvTYPE(sv) >= SVt_PVMG 1686 && SvMAGIC(sv) 1687 && (mg = mg_find(sv, PERL_MAGIC_regex_global)) 1688 && mg->mg_len >= 0) { 1689 PL_reg_ganch = strbeg + mg->mg_len; /* Defined pos() */ 1690 if (prog->reganch & ROPT_ANCH_GPOS) { 1691 if (s > PL_reg_ganch) 1692 goto phooey; 1693 s = PL_reg_ganch; 1694 } 1695 } 1696 else /* pos() not defined */ 1697 PL_reg_ganch = strbeg; 1698 } 1699 1700 if (!(flags & REXEC_CHECKED) && (prog->check_substr != Nullsv || prog->check_utf8 != Nullsv)) { 1701 re_scream_pos_data d; 1702 1703 d.scream_olds = &scream_olds; 1704 d.scream_pos = &scream_pos; 1705 s = re_intuit_start(prog, sv, s, strend, flags, &d); 1706 if (!s) { 1707 DEBUG_r(PerlIO_printf(Perl_debug_log, "Not present...\n")); 1708 goto phooey; /* not present */ 1709 } 1710 } 1711 1712 DEBUG_r({ 1713 char *s0 = UTF ? 1714 pv_uni_display(dsv0, (U8*)prog->precomp, prog->prelen, 60, 1715 UNI_DISPLAY_REGEX) : 1716 prog->precomp; 1717 int len0 = UTF ? SvCUR(dsv0) : prog->prelen; 1718 char *s1 = do_utf8 ? sv_uni_display(dsv1, sv, 60, 1719 UNI_DISPLAY_REGEX) : startpos; 1720 int len1 = do_utf8 ? SvCUR(dsv1) : strend - startpos; 1721 if (!PL_colorset) 1722 reginitcolors(); 1723 PerlIO_printf(Perl_debug_log, 1724 "%sMatching REx%s `%s%*.*s%s%s' against `%s%.*s%s%s'\n", 1725 PL_colors[4],PL_colors[5],PL_colors[0], 1726 len0, len0, s0, 1727 PL_colors[1], 1728 len0 > 60 ? "..." : "", 1729 PL_colors[0], 1730 (int)(len1 > 60 ? 60 : len1), 1731 s1, PL_colors[1], 1732 (len1 > 60 ? "..." : "") 1733 ); 1734 }); 1735 1736 /* Simplest case: anchored match need be tried only once. */ 1737 /* [unless only anchor is BOL and multiline is set] */ 1738 if (prog->reganch & (ROPT_ANCH & ~ROPT_ANCH_GPOS)) { 1739 if (s == startpos && regtry(prog, startpos)) 1740 goto got_it; 1741 else if (PL_multiline || (prog->reganch & ROPT_IMPLICIT) 1742 || (prog->reganch & ROPT_ANCH_MBOL)) /* XXXX SBOL? */ 1743 { 1744 char *end; 1745 1746 if (minlen) 1747 dontbother = minlen - 1; 1748 end = HOP3c(strend, -dontbother, strbeg) - 1; 1749 /* for multiline we only have to try after newlines */ 1750 if (prog->check_substr || prog->check_utf8) { 1751 if (s == startpos) 1752 goto after_try; 1753 while (1) { 1754 if (regtry(prog, s)) 1755 goto got_it; 1756 after_try: 1757 if (s >= end) 1758 goto phooey; 1759 if (prog->reganch & RE_USE_INTUIT) { 1760 s = re_intuit_start(prog, sv, s + 1, strend, flags, NULL); 1761 if (!s) 1762 goto phooey; 1763 } 1764 else 1765 s++; 1766 } 1767 } else { 1768 if (s > startpos) 1769 s--; 1770 while (s < end) { 1771 if (*s++ == '\n') { /* don't need PL_utf8skip here */ 1772 if (regtry(prog, s)) 1773 goto got_it; 1774 } 1775 } 1776 } 1777 } 1778 goto phooey; 1779 } else if (prog->reganch & ROPT_ANCH_GPOS) { 1780 if (regtry(prog, PL_reg_ganch)) 1781 goto got_it; 1782 goto phooey; 1783 } 1784 1785 /* Messy cases: unanchored match. */ 1786 if ((prog->anchored_substr || prog->anchored_utf8) && prog->reganch & ROPT_SKIP) { 1787 /* we have /x+whatever/ */ 1788 /* it must be a one character string (XXXX Except UTF?) */ 1789 char ch; 1790 #ifdef DEBUGGING 1791 int did_match = 0; 1792 #endif 1793 if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)) 1794 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); 1795 ch = SvPVX(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0]; 1796 1797 if (do_utf8) { 1798 while (s < strend) { 1799 if (*s == ch) { 1800 DEBUG_r( did_match = 1 ); 1801 if (regtry(prog, s)) goto got_it; 1802 s += UTF8SKIP(s); 1803 while (s < strend && *s == ch) 1804 s += UTF8SKIP(s); 1805 } 1806 s += UTF8SKIP(s); 1807 } 1808 } 1809 else { 1810 while (s < strend) { 1811 if (*s == ch) { 1812 DEBUG_r( did_match = 1 ); 1813 if (regtry(prog, s)) goto got_it; 1814 s++; 1815 while (s < strend && *s == ch) 1816 s++; 1817 } 1818 s++; 1819 } 1820 } 1821 DEBUG_r(if (!did_match) 1822 PerlIO_printf(Perl_debug_log, 1823 "Did not find anchored character...\n") 1824 ); 1825 } 1826 /*SUPPRESS 560*/ 1827 else if (prog->anchored_substr != Nullsv 1828 || prog->anchored_utf8 != Nullsv 1829 || ((prog->float_substr != Nullsv || prog->float_utf8 != Nullsv) 1830 && prog->float_max_offset < strend - s)) { 1831 SV *must; 1832 I32 back_max; 1833 I32 back_min; 1834 char *last; 1835 char *last1; /* Last position checked before */ 1836 #ifdef DEBUGGING 1837 int did_match = 0; 1838 #endif 1839 if (prog->anchored_substr || prog->anchored_utf8) { 1840 if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)) 1841 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); 1842 must = do_utf8 ? prog->anchored_utf8 : prog->anchored_substr; 1843 back_max = back_min = prog->anchored_offset; 1844 } else { 1845 if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) 1846 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); 1847 must = do_utf8 ? prog->float_utf8 : prog->float_substr; 1848 back_max = prog->float_max_offset; 1849 back_min = prog->float_min_offset; 1850 } 1851 if (must == &PL_sv_undef) 1852 /* could not downgrade utf8 check substring, so must fail */ 1853 goto phooey; 1854 1855 last = HOP3c(strend, /* Cannot start after this */ 1856 -(I32)(CHR_SVLEN(must) 1857 - (SvTAIL(must) != 0) + back_min), strbeg); 1858 1859 if (s > PL_bostr) 1860 last1 = HOPc(s, -1); 1861 else 1862 last1 = s - 1; /* bogus */ 1863 1864 /* XXXX check_substr already used to find `s', can optimize if 1865 check_substr==must. */ 1866 scream_pos = -1; 1867 dontbother = end_shift; 1868 strend = HOPc(strend, -dontbother); 1869 while ( (s <= last) && 1870 ((flags & REXEC_SCREAM) 1871 ? (s = screaminstr(sv, must, HOP3c(s, back_min, strend) - strbeg, 1872 end_shift, &scream_pos, 0)) 1873 : (s = fbm_instr((unsigned char*)HOP3(s, back_min, strend), 1874 (unsigned char*)strend, must, 1875 PL_multiline ? FBMrf_MULTILINE : 0))) ) { 1876 /* we may be pointing at the wrong string */ 1877 if ((flags & REXEC_SCREAM) && RX_MATCH_COPIED(prog)) 1878 s = strbeg + (s - SvPVX(sv)); 1879 DEBUG_r( did_match = 1 ); 1880 if (HOPc(s, -back_max) > last1) { 1881 last1 = HOPc(s, -back_min); 1882 s = HOPc(s, -back_max); 1883 } 1884 else { 1885 char *t = (last1 >= PL_bostr) ? HOPc(last1, 1) : last1 + 1; 1886 1887 last1 = HOPc(s, -back_min); 1888 s = t; 1889 } 1890 if (do_utf8) { 1891 while (s <= last1) { 1892 if (regtry(prog, s)) 1893 goto got_it; 1894 s += UTF8SKIP(s); 1895 } 1896 } 1897 else { 1898 while (s <= last1) { 1899 if (regtry(prog, s)) 1900 goto got_it; 1901 s++; 1902 } 1903 } 1904 } 1905 DEBUG_r(if (!did_match) 1906 PerlIO_printf(Perl_debug_log, 1907 "Did not find %s substr `%s%.*s%s'%s...\n", 1908 ((must == prog->anchored_substr || must == prog->anchored_utf8) 1909 ? "anchored" : "floating"), 1910 PL_colors[0], 1911 (int)(SvCUR(must) - (SvTAIL(must)!=0)), 1912 SvPVX(must), 1913 PL_colors[1], (SvTAIL(must) ? "$" : "")) 1914 ); 1915 goto phooey; 1916 } 1917 else if ((c = prog->regstclass)) { 1918 if (minlen) { 1919 I32 op = (U8)OP(prog->regstclass); 1920 /* don't bother with what can't match */ 1921 if (PL_regkind[op] != EXACT && op != CANY) 1922 strend = HOPc(strend, -(minlen - 1)); 1923 } 1924 DEBUG_r({ 1925 SV *prop = sv_newmortal(); 1926 char *s0; 1927 char *s1; 1928 int len0; 1929 int len1; 1930 1931 regprop(prop, c); 1932 s0 = UTF ? 1933 pv_uni_display(dsv0, (U8*)SvPVX(prop), SvCUR(prop), 60, 1934 UNI_DISPLAY_REGEX) : 1935 SvPVX(prop); 1936 len0 = UTF ? SvCUR(dsv0) : SvCUR(prop); 1937 s1 = UTF ? 1938 sv_uni_display(dsv1, sv, 60, UNI_DISPLAY_REGEX) : s; 1939 len1 = UTF ? SvCUR(dsv1) : strend - s; 1940 PerlIO_printf(Perl_debug_log, 1941 "Matching stclass `%*.*s' against `%*.*s'\n", 1942 len0, len0, s0, 1943 len1, len1, s1); 1944 }); 1945 if (find_byclass(prog, c, s, strend, startpos, 0)) 1946 goto got_it; 1947 DEBUG_r(PerlIO_printf(Perl_debug_log, "Contradicts stclass...\n")); 1948 } 1949 else { 1950 dontbother = 0; 1951 if (prog->float_substr != Nullsv || prog->float_utf8 != Nullsv) { 1952 /* Trim the end. */ 1953 char *last; 1954 SV* float_real; 1955 1956 if (!(do_utf8 ? prog->float_utf8 : prog->float_substr)) 1957 do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog); 1958 float_real = do_utf8 ? prog->float_utf8 : prog->float_substr; 1959 1960 if (flags & REXEC_SCREAM) { 1961 last = screaminstr(sv, float_real, s - strbeg, 1962 end_shift, &scream_pos, 1); /* last one */ 1963 if (!last) 1964 last = scream_olds; /* Only one occurrence. */ 1965 /* we may be pointing at the wrong string */ 1966 else if (RX_MATCH_COPIED(prog)) 1967 s = strbeg + (s - SvPVX(sv)); 1968 } 1969 else { 1970 STRLEN len; 1971 char *little = SvPV(float_real, len); 1972 1973 if (SvTAIL(float_real)) { 1974 if (memEQ(strend - len + 1, little, len - 1)) 1975 last = strend - len + 1; 1976 else if (!PL_multiline) 1977 last = memEQ(strend - len, little, len) 1978 ? strend - len : Nullch; 1979 else 1980 goto find_last; 1981 } else { 1982 find_last: 1983 if (len) 1984 last = rninstr(s, strend, little, little + len); 1985 else 1986 last = strend; /* matching `$' */ 1987 } 1988 } 1989 if (last == NULL) { 1990 DEBUG_r(PerlIO_printf(Perl_debug_log, 1991 "%sCan't trim the tail, match fails (should not happen)%s\n", 1992 PL_colors[4],PL_colors[5])); 1993 goto phooey; /* Should not happen! */ 1994 } 1995 dontbother = strend - last + prog->float_min_offset; 1996 } 1997 if (minlen && (dontbother < minlen)) 1998 dontbother = minlen - 1; 1999 strend -= dontbother; /* this one's always in bytes! */ 2000 /* We don't know much -- general case. */ 2001 if (do_utf8) { 2002 for (;;) { 2003 if (regtry(prog, s)) 2004 goto got_it; 2005 if (s >= strend) 2006 break; 2007 s += UTF8SKIP(s); 2008 }; 2009 } 2010 else { 2011 do { 2012 if (regtry(prog, s)) 2013 goto got_it; 2014 } while (s++ < strend); 2015 } 2016 } 2017 2018 /* Failure. */ 2019 goto phooey; 2020 2021 got_it: 2022 RX_MATCH_TAINTED_set(prog, PL_reg_flags & RF_tainted); 2023 2024 if (PL_reg_eval_set) { 2025 /* Preserve the current value of $^R */ 2026 if (oreplsv != GvSV(PL_replgv)) 2027 sv_setsv(oreplsv, GvSV(PL_replgv));/* So that when GvSV(replgv) is 2028 restored, the value remains 2029 the same. */ 2030 restore_pos(aTHX_ 0); 2031 } 2032 2033 /* make sure $`, $&, $', and $digit will work later */ 2034 if ( !(flags & REXEC_NOT_FIRST) ) { 2035 if (RX_MATCH_COPIED(prog)) { 2036 Safefree(prog->subbeg); 2037 RX_MATCH_COPIED_off(prog); 2038 } 2039 if (flags & REXEC_COPY_STR) { 2040 I32 i = PL_regeol - startpos + (stringarg - strbeg); 2041 2042 s = savepvn(strbeg, i); 2043 prog->subbeg = s; 2044 prog->sublen = i; 2045 RX_MATCH_COPIED_on(prog); 2046 } 2047 else { 2048 prog->subbeg = strbeg; 2049 prog->sublen = PL_regeol - strbeg; /* strend may have been modified */ 2050 } 2051 } 2052 2053 return 1; 2054 2055 phooey: 2056 DEBUG_r(PerlIO_printf(Perl_debug_log, "%sMatch failed%s\n", 2057 PL_colors[4],PL_colors[5])); 2058 if (PL_reg_eval_set) 2059 restore_pos(aTHX_ 0); 2060 return 0; 2061 } 2062 2063 /* 2064 - regtry - try match at specific point 2065 */ 2066 STATIC I32 /* 0 failure, 1 success */ 2067 S_regtry(pTHX_ regexp *prog, char *startpos) 2068 { 2069 register I32 i; 2070 register I32 *sp; 2071 register I32 *ep; 2072 CHECKPOINT lastcp; 2073 2074 #ifdef DEBUGGING 2075 PL_regindent = 0; /* XXXX Not good when matches are reenterable... */ 2076 #endif 2077 if ((prog->reganch & ROPT_EVAL_SEEN) && !PL_reg_eval_set) { 2078 MAGIC *mg; 2079 2080 PL_reg_eval_set = RS_init; 2081 DEBUG_r(DEBUG_s( 2082 PerlIO_printf(Perl_debug_log, " setting stack tmpbase at %"IVdf"\n", 2083 (IV)(PL_stack_sp - PL_stack_base)); 2084 )); 2085 SAVEI32(cxstack[cxstack_ix].blk_oldsp); 2086 cxstack[cxstack_ix].blk_oldsp = PL_stack_sp - PL_stack_base; 2087 /* Otherwise OP_NEXTSTATE will free whatever on stack now. */ 2088 SAVETMPS; 2089 /* Apparently this is not needed, judging by wantarray. */ 2090 /* SAVEI8(cxstack[cxstack_ix].blk_gimme); 2091 cxstack[cxstack_ix].blk_gimme = G_SCALAR; */ 2092 2093 if (PL_reg_sv) { 2094 /* Make $_ available to executed code. */ 2095 if (PL_reg_sv != DEFSV) { 2096 /* SAVE_DEFSV does *not* suffice here for USE_5005THREADS */ 2097 SAVESPTR(DEFSV); 2098 DEFSV = PL_reg_sv; 2099 } 2100 2101 if (!(SvTYPE(PL_reg_sv) >= SVt_PVMG && SvMAGIC(PL_reg_sv) 2102 && (mg = mg_find(PL_reg_sv, PERL_MAGIC_regex_global)))) { 2103 /* prepare for quick setting of pos */ 2104 sv_magic(PL_reg_sv, (SV*)0, 2105 PERL_MAGIC_regex_global, Nullch, 0); 2106 mg = mg_find(PL_reg_sv, PERL_MAGIC_regex_global); 2107 mg->mg_len = -1; 2108 } 2109 PL_reg_magic = mg; 2110 PL_reg_oldpos = mg->mg_len; 2111 SAVEDESTRUCTOR_X(restore_pos, 0); 2112 } 2113 if (!PL_reg_curpm) { 2114 Newz(22,PL_reg_curpm, 1, PMOP); 2115 #ifdef USE_ITHREADS 2116 { 2117 SV* repointer = newSViv(0); 2118 /* so we know which PL_regex_padav element is PL_reg_curpm */ 2119 SvFLAGS(repointer) |= SVf_BREAK; 2120 av_push(PL_regex_padav,repointer); 2121 PL_reg_curpm->op_pmoffset = av_len(PL_regex_padav); 2122 PL_regex_pad = AvARRAY(PL_regex_padav); 2123 } 2124 #endif 2125 } 2126 PM_SETRE(PL_reg_curpm, prog); 2127 PL_reg_oldcurpm = PL_curpm; 2128 PL_curpm = PL_reg_curpm; 2129 if (RX_MATCH_COPIED(prog)) { 2130 /* Here is a serious problem: we cannot rewrite subbeg, 2131 since it may be needed if this match fails. Thus 2132 $` inside (?{}) could fail... */ 2133 PL_reg_oldsaved = prog->subbeg; 2134 PL_reg_oldsavedlen = prog->sublen; 2135 RX_MATCH_COPIED_off(prog); 2136 } 2137 else 2138 PL_reg_oldsaved = Nullch; 2139 prog->subbeg = PL_bostr; 2140 prog->sublen = PL_regeol - PL_bostr; /* strend may have been modified */ 2141 } 2142 prog->startp[0] = startpos - PL_bostr; 2143 PL_reginput = startpos; 2144 PL_regstartp = prog->startp; 2145 PL_regendp = prog->endp; 2146 PL_reglastparen = &prog->lastparen; 2147 PL_reglastcloseparen = &prog->lastcloseparen; 2148 prog->lastparen = 0; 2149 prog->lastcloseparen = 0; 2150 PL_regsize = 0; 2151 DEBUG_r(PL_reg_starttry = startpos); 2152 if (PL_reg_start_tmpl <= prog->nparens) { 2153 PL_reg_start_tmpl = prog->nparens*3/2 + 3; 2154 if(PL_reg_start_tmp) 2155 Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*); 2156 else 2157 New(22,PL_reg_start_tmp, PL_reg_start_tmpl, char*); 2158 } 2159 2160 /* XXXX What this code is doing here?!!! There should be no need 2161 to do this again and again, PL_reglastparen should take care of 2162 this! --ilya*/ 2163 2164 /* Tests pat.t#187 and split.t#{13,14} seem to depend on this code. 2165 * Actually, the code in regcppop() (which Ilya may be meaning by 2166 * PL_reglastparen), is not needed at all by the test suite 2167 * (op/regexp, op/pat, op/split), but that code is needed, oddly 2168 * enough, for building DynaLoader, or otherwise this 2169 * "Error: '*' not in typemap in DynaLoader.xs, line 164" 2170 * will happen. Meanwhile, this code *is* needed for the 2171 * above-mentioned test suite tests to succeed. The common theme 2172 * on those tests seems to be returning null fields from matches. 2173 * --jhi */ 2174 #if 1 2175 sp = prog->startp; 2176 ep = prog->endp; 2177 if (prog->nparens) { 2178 for (i = prog->nparens; i > (I32)*PL_reglastparen; i--) { 2179 *++sp = -1; 2180 *++ep = -1; 2181 } 2182 } 2183 #endif 2184 REGCP_SET(lastcp); 2185 if (regmatch(prog->program + 1)) { 2186 prog->endp[0] = PL_reginput - PL_bostr; 2187 return 1; 2188 } 2189 REGCP_UNWIND(lastcp); 2190 return 0; 2191 } 2192 2193 #define RE_UNWIND_BRANCH 1 2194 #define RE_UNWIND_BRANCHJ 2 2195 2196 union re_unwind_t; 2197 2198 typedef struct { /* XX: makes sense to enlarge it... */ 2199 I32 type; 2200 I32 prev; 2201 CHECKPOINT lastcp; 2202 } re_unwind_generic_t; 2203 2204 typedef struct { 2205 I32 type; 2206 I32 prev; 2207 CHECKPOINT lastcp; 2208 I32 lastparen; 2209 regnode *next; 2210 char *locinput; 2211 I32 nextchr; 2212 #ifdef DEBUGGING 2213 int regindent; 2214 #endif 2215 } re_unwind_branch_t; 2216 2217 typedef union re_unwind_t { 2218 I32 type; 2219 re_unwind_generic_t generic; 2220 re_unwind_branch_t branch; 2221 } re_unwind_t; 2222 2223 #define sayYES goto yes 2224 #define sayNO goto no 2225 #define sayNO_ANYOF goto no_anyof 2226 #define sayYES_FINAL goto yes_final 2227 #define sayYES_LOUD goto yes_loud 2228 #define sayNO_FINAL goto no_final 2229 #define sayNO_SILENT goto do_no 2230 #define saySAME(x) if (x) goto yes; else goto no 2231 2232 #define REPORT_CODE_OFF 24 2233 2234 /* 2235 - regmatch - main matching routine 2236 * 2237 * Conceptually the strategy is simple: check to see whether the current 2238 * node matches, call self recursively to see whether the rest matches, 2239 * and then act accordingly. In practice we make some effort to avoid 2240 * recursion, in particular by going through "ordinary" nodes (that don't 2241 * need to know whether the rest of the match failed) by a loop instead of 2242 * by recursion. 2243 */ 2244 /* [lwall] I've hoisted the register declarations to the outer block in order to 2245 * maybe save a little bit of pushing and popping on the stack. It also takes 2246 * advantage of machines that use a register save mask on subroutine entry. 2247 */ 2248 STATIC I32 /* 0 failure, 1 success */ 2249 S_regmatch(pTHX_ regnode *prog) 2250 { 2251 register regnode *scan; /* Current node. */ 2252 regnode *next; /* Next node. */ 2253 regnode *inner; /* Next node in internal branch. */ 2254 register I32 nextchr; /* renamed nextchr - nextchar colides with 2255 function of same name */ 2256 register I32 n; /* no or next */ 2257 register I32 ln = 0; /* len or last */ 2258 register char *s = Nullch; /* operand or save */ 2259 register char *locinput = PL_reginput; 2260 register I32 c1 = 0, c2 = 0, paren; /* case fold search, parenth */ 2261 int minmod = 0, sw = 0, logical = 0; 2262 I32 unwind = 0; 2263 #if 0 2264 I32 firstcp = PL_savestack_ix; 2265 #endif 2266 register bool do_utf8 = PL_reg_match_utf8; 2267 #ifdef DEBUGGING 2268 SV *dsv0 = PERL_DEBUG_PAD_ZERO(0); 2269 SV *dsv1 = PERL_DEBUG_PAD_ZERO(1); 2270 SV *dsv2 = PERL_DEBUG_PAD_ZERO(2); 2271 #endif 2272 2273 #ifdef DEBUGGING 2274 PL_regindent++; 2275 #endif 2276 2277 /* Note that nextchr is a byte even in UTF */ 2278 nextchr = UCHARAT(locinput); 2279 scan = prog; 2280 while (scan != NULL) { 2281 2282 DEBUG_r( { 2283 SV *prop = sv_newmortal(); 2284 int docolor = *PL_colors[0]; 2285 int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */ 2286 int l = (PL_regeol - locinput) > taill ? taill : (PL_regeol - locinput); 2287 /* The part of the string before starttry has one color 2288 (pref0_len chars), between starttry and current 2289 position another one (pref_len - pref0_len chars), 2290 after the current position the third one. 2291 We assume that pref0_len <= pref_len, otherwise we 2292 decrease pref0_len. */ 2293 int pref_len = (locinput - PL_bostr) > (5 + taill) - l 2294 ? (5 + taill) - l : locinput - PL_bostr; 2295 int pref0_len; 2296 2297 while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput - pref_len))) 2298 pref_len++; 2299 pref0_len = pref_len - (locinput - PL_reg_starttry); 2300 if (l + pref_len < (5 + taill) && l < PL_regeol - locinput) 2301 l = ( PL_regeol - locinput > (5 + taill) - pref_len 2302 ? (5 + taill) - pref_len : PL_regeol - locinput); 2303 while (do_utf8 && UTF8_IS_CONTINUATION(*(U8*)(locinput + l))) 2304 l--; 2305 if (pref0_len < 0) 2306 pref0_len = 0; 2307 if (pref0_len > pref_len) 2308 pref0_len = pref_len; 2309 regprop(prop, scan); 2310 { 2311 char *s0 = 2312 do_utf8 && OP(scan) != CANY ? 2313 pv_uni_display(dsv0, (U8*)(locinput - pref_len), 2314 pref0_len, 60, UNI_DISPLAY_REGEX) : 2315 locinput - pref_len; 2316 int len0 = do_utf8 ? strlen(s0) : pref0_len; 2317 char *s1 = do_utf8 && OP(scan) != CANY ? 2318 pv_uni_display(dsv1, (U8*)(locinput - pref_len + pref0_len), 2319 pref_len - pref0_len, 60, UNI_DISPLAY_REGEX) : 2320 locinput - pref_len + pref0_len; 2321 int len1 = do_utf8 ? strlen(s1) : pref_len - pref0_len; 2322 char *s2 = do_utf8 && OP(scan) != CANY ? 2323 pv_uni_display(dsv2, (U8*)locinput, 2324 PL_regeol - locinput, 60, UNI_DISPLAY_REGEX) : 2325 locinput; 2326 int len2 = do_utf8 ? strlen(s2) : l; 2327 PerlIO_printf(Perl_debug_log, 2328 "%4"IVdf" <%s%.*s%s%s%.*s%s%s%s%.*s%s>%*s|%3"IVdf":%*s%s\n", 2329 (IV)(locinput - PL_bostr), 2330 PL_colors[4], 2331 len0, s0, 2332 PL_colors[5], 2333 PL_colors[2], 2334 len1, s1, 2335 PL_colors[3], 2336 (docolor ? "" : "> <"), 2337 PL_colors[0], 2338 len2, s2, 2339 PL_colors[1], 2340 15 - l - pref_len + 1, 2341 "", 2342 (IV)(scan - PL_regprogram), PL_regindent*2, "", 2343 SvPVX(prop)); 2344 } 2345 }); 2346 2347 next = scan + NEXT_OFF(scan); 2348 if (next == scan) 2349 next = NULL; 2350 2351 switch (OP(scan)) { 2352 case BOL: 2353 if (locinput == PL_bostr || (PL_multiline && 2354 (nextchr || locinput < PL_regeol) && locinput[-1] == '\n') ) 2355 { 2356 /* regtill = regbol; */ 2357 break; 2358 } 2359 sayNO; 2360 case MBOL: 2361 if (locinput == PL_bostr || 2362 ((nextchr || locinput < PL_regeol) && locinput[-1] == '\n')) 2363 { 2364 break; 2365 } 2366 sayNO; 2367 case SBOL: 2368 if (locinput == PL_bostr) 2369 break; 2370 sayNO; 2371 case GPOS: 2372 if (locinput == PL_reg_ganch) 2373 break; 2374 sayNO; 2375 case EOL: 2376 if (PL_multiline) 2377 goto meol; 2378 else 2379 goto seol; 2380 case MEOL: 2381 meol: 2382 if ((nextchr || locinput < PL_regeol) && nextchr != '\n') 2383 sayNO; 2384 break; 2385 case SEOL: 2386 seol: 2387 if ((nextchr || locinput < PL_regeol) && nextchr != '\n') 2388 sayNO; 2389 if (PL_regeol - locinput > 1) 2390 sayNO; 2391 break; 2392 case EOS: 2393 if (PL_regeol != locinput) 2394 sayNO; 2395 break; 2396 case SANY: 2397 if (!nextchr && locinput >= PL_regeol) 2398 sayNO; 2399 if (do_utf8) { 2400 locinput += PL_utf8skip[nextchr]; 2401 if (locinput > PL_regeol) 2402 sayNO; 2403 nextchr = UCHARAT(locinput); 2404 } 2405 else 2406 nextchr = UCHARAT(++locinput); 2407 break; 2408 case CANY: 2409 if (!nextchr && locinput >= PL_regeol) 2410 sayNO; 2411 nextchr = UCHARAT(++locinput); 2412 break; 2413 case REG_ANY: 2414 if ((!nextchr && locinput >= PL_regeol) || nextchr == '\n') 2415 sayNO; 2416 if (do_utf8) { 2417 locinput += PL_utf8skip[nextchr]; 2418 if (locinput > PL_regeol) 2419 sayNO; 2420 nextchr = UCHARAT(locinput); 2421 } 2422 else 2423 nextchr = UCHARAT(++locinput); 2424 break; 2425 case EXACT: 2426 s = STRING(scan); 2427 ln = STR_LEN(scan); 2428 if (do_utf8 != UTF) { 2429 /* The target and the pattern have differing utf8ness. */ 2430 char *l = locinput; 2431 char *e = s + ln; 2432 STRLEN ulen; 2433 2434 if (do_utf8) { 2435 /* The target is utf8, the pattern is not utf8. */ 2436 while (s < e) { 2437 if (l >= PL_regeol) 2438 sayNO; 2439 if (NATIVE_TO_UNI(*(U8*)s) != 2440 utf8n_to_uvuni((U8*)l, UTF8_MAXLEN, &ulen, 2441 ckWARN(WARN_UTF8) ? 2442 0 : UTF8_ALLOW_ANY)) 2443 sayNO; 2444 l += ulen; 2445 s ++; 2446 } 2447 } 2448 else { 2449 /* The target is not utf8, the pattern is utf8. */ 2450 while (s < e) { 2451 if (l >= PL_regeol) 2452 sayNO; 2453 if (NATIVE_TO_UNI(*((U8*)l)) != 2454 utf8n_to_uvuni((U8*)s, UTF8_MAXLEN, &ulen, 2455 ckWARN(WARN_UTF8) ? 2456 0 : UTF8_ALLOW_ANY)) 2457 sayNO; 2458 s += ulen; 2459 l ++; 2460 } 2461 } 2462 locinput = l; 2463 nextchr = UCHARAT(locinput); 2464 break; 2465 } 2466 /* The target and the pattern have the same utf8ness. */ 2467 /* Inline the first character, for speed. */ 2468 if (UCHARAT(s) != nextchr) 2469 sayNO; 2470 if (PL_regeol - locinput < ln) 2471 sayNO; 2472 if (ln > 1 && memNE(s, locinput, ln)) 2473 sayNO; 2474 locinput += ln; 2475 nextchr = UCHARAT(locinput); 2476 break; 2477 case EXACTFL: 2478 PL_reg_flags |= RF_tainted; 2479 /* FALL THROUGH */ 2480 case EXACTF: 2481 s = STRING(scan); 2482 ln = STR_LEN(scan); 2483 2484 if (do_utf8 || UTF) { 2485 /* Either target or the pattern are utf8. */ 2486 char *l = locinput; 2487 char *e = PL_regeol; 2488 2489 if (ibcmp_utf8(s, 0, ln, (bool)UTF, 2490 l, &e, 0, do_utf8)) { 2491 /* One more case for the sharp s: 2492 * pack("U0U*", 0xDF) =~ /ss/i, 2493 * the 0xC3 0x9F are the UTF-8 2494 * byte sequence for the U+00DF. */ 2495 if (!(do_utf8 && 2496 toLOWER(s[0]) == 's' && 2497 ln >= 2 && 2498 toLOWER(s[1]) == 's' && 2499 (U8)l[0] == 0xC3 && 2500 e - l >= 2 && 2501 (U8)l[1] == 0x9F)) 2502 sayNO; 2503 } 2504 locinput = e; 2505 nextchr = UCHARAT(locinput); 2506 break; 2507 } 2508 2509 /* Neither the target and the pattern are utf8. */ 2510 2511 /* Inline the first character, for speed. */ 2512 if (UCHARAT(s) != nextchr && 2513 UCHARAT(s) != ((OP(scan) == EXACTF) 2514 ? PL_fold : PL_fold_locale)[nextchr]) 2515 sayNO; 2516 if (PL_regeol - locinput < ln) 2517 sayNO; 2518 if (ln > 1 && (OP(scan) == EXACTF 2519 ? ibcmp(s, locinput, ln) 2520 : ibcmp_locale(s, locinput, ln))) 2521 sayNO; 2522 locinput += ln; 2523 nextchr = UCHARAT(locinput); 2524 break; 2525 case ANYOF: 2526 if (do_utf8) { 2527 STRLEN inclasslen = PL_regeol - locinput; 2528 2529 if (!reginclass(scan, (U8*)locinput, &inclasslen, do_utf8)) 2530 sayNO_ANYOF; 2531 if (locinput >= PL_regeol) 2532 sayNO; 2533 locinput += inclasslen ? inclasslen : UTF8SKIP(locinput); 2534 nextchr = UCHARAT(locinput); 2535 break; 2536 } 2537 else { 2538 if (nextchr < 0) 2539 nextchr = UCHARAT(locinput); 2540 if (!REGINCLASS(scan, (U8*)locinput)) 2541 sayNO_ANYOF; 2542 if (!nextchr && locinput >= PL_regeol) 2543 sayNO; 2544 nextchr = UCHARAT(++locinput); 2545 break; 2546 } 2547 no_anyof: 2548 /* If we might have the case of the German sharp s 2549 * in a casefolding Unicode character class. */ 2550 2551 if (ANYOF_FOLD_SHARP_S(scan, locinput, PL_regeol)) { 2552 locinput += SHARP_S_SKIP; 2553 nextchr = UCHARAT(locinput); 2554 } 2555 else 2556 sayNO; 2557 break; 2558 case ALNUML: 2559 PL_reg_flags |= RF_tainted; 2560 /* FALL THROUGH */ 2561 case ALNUM: 2562 if (!nextchr) 2563 sayNO; 2564 if (do_utf8) { 2565 LOAD_UTF8_CHARCLASS(alnum,"a"); 2566 if (!(OP(scan) == ALNUM 2567 ? swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8) 2568 : isALNUM_LC_utf8((U8*)locinput))) 2569 { 2570 sayNO; 2571 } 2572 locinput += PL_utf8skip[nextchr]; 2573 nextchr = UCHARAT(locinput); 2574 break; 2575 } 2576 if (!(OP(scan) == ALNUM 2577 ? isALNUM(nextchr) : isALNUM_LC(nextchr))) 2578 sayNO; 2579 nextchr = UCHARAT(++locinput); 2580 break; 2581 case NALNUML: 2582 PL_reg_flags |= RF_tainted; 2583 /* FALL THROUGH */ 2584 case NALNUM: 2585 if (!nextchr && locinput >= PL_regeol) 2586 sayNO; 2587 if (do_utf8) { 2588 LOAD_UTF8_CHARCLASS(alnum,"a"); 2589 if (OP(scan) == NALNUM 2590 ? swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8) 2591 : isALNUM_LC_utf8((U8*)locinput)) 2592 { 2593 sayNO; 2594 } 2595 locinput += PL_utf8skip[nextchr]; 2596 nextchr = UCHARAT(locinput); 2597 break; 2598 } 2599 if (OP(scan) == NALNUM 2600 ? isALNUM(nextchr) : isALNUM_LC(nextchr)) 2601 sayNO; 2602 nextchr = UCHARAT(++locinput); 2603 break; 2604 case BOUNDL: 2605 case NBOUNDL: 2606 PL_reg_flags |= RF_tainted; 2607 /* FALL THROUGH */ 2608 case BOUND: 2609 case NBOUND: 2610 /* was last char in word? */ 2611 if (do_utf8) { 2612 if (locinput == PL_bostr) 2613 ln = '\n'; 2614 else { 2615 U8 *r = reghop3((U8*)locinput, -1, (U8*)PL_bostr); 2616 2617 ln = utf8n_to_uvchr(r, UTF8SKIP(r), 0, 0); 2618 } 2619 if (OP(scan) == BOUND || OP(scan) == NBOUND) { 2620 ln = isALNUM_uni(ln); 2621 LOAD_UTF8_CHARCLASS(alnum,"a"); 2622 n = swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8); 2623 } 2624 else { 2625 ln = isALNUM_LC_uvchr(UNI_TO_NATIVE(ln)); 2626 n = isALNUM_LC_utf8((U8*)locinput); 2627 } 2628 } 2629 else { 2630 ln = (locinput != PL_bostr) ? 2631 UCHARAT(locinput - 1) : '\n'; 2632 if (OP(scan) == BOUND || OP(scan) == NBOUND) { 2633 ln = isALNUM(ln); 2634 n = isALNUM(nextchr); 2635 } 2636 else { 2637 ln = isALNUM_LC(ln); 2638 n = isALNUM_LC(nextchr); 2639 } 2640 } 2641 if (((!ln) == (!n)) == (OP(scan) == BOUND || 2642 OP(scan) == BOUNDL)) 2643 sayNO; 2644 break; 2645 case SPACEL: 2646 PL_reg_flags |= RF_tainted; 2647 /* FALL THROUGH */ 2648 case SPACE: 2649 if (!nextchr) 2650 sayNO; 2651 if (do_utf8) { 2652 if (UTF8_IS_CONTINUED(nextchr)) { 2653 LOAD_UTF8_CHARCLASS(space," "); 2654 if (!(OP(scan) == SPACE 2655 ? swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8) 2656 : isSPACE_LC_utf8((U8*)locinput))) 2657 { 2658 sayNO; 2659 } 2660 locinput += PL_utf8skip[nextchr]; 2661 nextchr = UCHARAT(locinput); 2662 break; 2663 } 2664 if (!(OP(scan) == SPACE 2665 ? isSPACE(nextchr) : isSPACE_LC(nextchr))) 2666 sayNO; 2667 nextchr = UCHARAT(++locinput); 2668 } 2669 else { 2670 if (!(OP(scan) == SPACE 2671 ? isSPACE(nextchr) : isSPACE_LC(nextchr))) 2672 sayNO; 2673 nextchr = UCHARAT(++locinput); 2674 } 2675 break; 2676 case NSPACEL: 2677 PL_reg_flags |= RF_tainted; 2678 /* FALL THROUGH */ 2679 case NSPACE: 2680 if (!nextchr && locinput >= PL_regeol) 2681 sayNO; 2682 if (do_utf8) { 2683 LOAD_UTF8_CHARCLASS(space," "); 2684 if (OP(scan) == NSPACE 2685 ? swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8) 2686 : isSPACE_LC_utf8((U8*)locinput)) 2687 { 2688 sayNO; 2689 } 2690 locinput += PL_utf8skip[nextchr]; 2691 nextchr = UCHARAT(locinput); 2692 break; 2693 } 2694 if (OP(scan) == NSPACE 2695 ? isSPACE(nextchr) : isSPACE_LC(nextchr)) 2696 sayNO; 2697 nextchr = UCHARAT(++locinput); 2698 break; 2699 case DIGITL: 2700 PL_reg_flags |= RF_tainted; 2701 /* FALL THROUGH */ 2702 case DIGIT: 2703 if (!nextchr) 2704 sayNO; 2705 if (do_utf8) { 2706 LOAD_UTF8_CHARCLASS(digit,"0"); 2707 if (!(OP(scan) == DIGIT 2708 ? swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8) 2709 : isDIGIT_LC_utf8((U8*)locinput))) 2710 { 2711 sayNO; 2712 } 2713 locinput += PL_utf8skip[nextchr]; 2714 nextchr = UCHARAT(locinput); 2715 break; 2716 } 2717 if (!(OP(scan) == DIGIT 2718 ? isDIGIT(nextchr) : isDIGIT_LC(nextchr))) 2719 sayNO; 2720 nextchr = UCHARAT(++locinput); 2721 break; 2722 case NDIGITL: 2723 PL_reg_flags |= RF_tainted; 2724 /* FALL THROUGH */ 2725 case NDIGIT: 2726 if (!nextchr && locinput >= PL_regeol) 2727 sayNO; 2728 if (do_utf8) { 2729 LOAD_UTF8_CHARCLASS(digit,"0"); 2730 if (OP(scan) == NDIGIT 2731 ? swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8) 2732 : isDIGIT_LC_utf8((U8*)locinput)) 2733 { 2734 sayNO; 2735 } 2736 locinput += PL_utf8skip[nextchr]; 2737 nextchr = UCHARAT(locinput); 2738 break; 2739 } 2740 if (OP(scan) == NDIGIT 2741 ? isDIGIT(nextchr) : isDIGIT_LC(nextchr)) 2742 sayNO; 2743 nextchr = UCHARAT(++locinput); 2744 break; 2745 case CLUMP: 2746 if (locinput >= PL_regeol) 2747 sayNO; 2748 if (do_utf8) { 2749 LOAD_UTF8_CHARCLASS(mark,"~"); 2750 if (swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8)) 2751 sayNO; 2752 locinput += PL_utf8skip[nextchr]; 2753 while (locinput < PL_regeol && 2754 swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8)) 2755 locinput += UTF8SKIP(locinput); 2756 if (locinput > PL_regeol) 2757 sayNO; 2758 } 2759 else 2760 locinput++; 2761 nextchr = UCHARAT(locinput); 2762 break; 2763 case REFFL: 2764 PL_reg_flags |= RF_tainted; 2765 /* FALL THROUGH */ 2766 case REF: 2767 case REFF: 2768 n = ARG(scan); /* which paren pair */ 2769 ln = PL_regstartp[n]; 2770 PL_reg_leftiter = PL_reg_maxiter; /* Void cache */ 2771 if ((I32)*PL_reglastparen < n || ln == -1) 2772 sayNO; /* Do not match unless seen CLOSEn. */ 2773 if (ln == PL_regendp[n]) 2774 break; 2775 2776 s = PL_bostr + ln; 2777 if (do_utf8 && OP(scan) != REF) { /* REF can do byte comparison */ 2778 char *l = locinput; 2779 char *e = PL_bostr + PL_regendp[n]; 2780 /* 2781 * Note that we can't do the "other character" lookup trick as 2782 * in the 8-bit case (no pun intended) because in Unicode we 2783 * have to map both upper and title case to lower case. 2784 */ 2785 if (OP(scan) == REFF) { 2786 STRLEN ulen1, ulen2; 2787 U8 tmpbuf1[UTF8_MAXLEN_UCLC+1]; 2788 U8 tmpbuf2[UTF8_MAXLEN_UCLC+1]; 2789 while (s < e) { 2790 if (l >= PL_regeol) 2791 sayNO; 2792 toLOWER_utf8((U8*)s, tmpbuf1, &ulen1); 2793 toLOWER_utf8((U8*)l, tmpbuf2, &ulen2); 2794 if (ulen1 != ulen2 || memNE((char *)tmpbuf1, (char *)tmpbuf2, ulen1)) 2795 sayNO; 2796 s += ulen1; 2797 l += ulen2; 2798 } 2799 } 2800 locinput = l; 2801 nextchr = UCHARAT(locinput); 2802 break; 2803 } 2804 2805 /* Inline the first character, for speed. */ 2806 if (UCHARAT(s) != nextchr && 2807 (OP(scan) == REF || 2808 (UCHARAT(s) != ((OP(scan) == REFF 2809 ? PL_fold : PL_fold_locale)[nextchr])))) 2810 sayNO; 2811 ln = PL_regendp[n] - ln; 2812 if (locinput + ln > PL_regeol) 2813 sayNO; 2814 if (ln > 1 && (OP(scan) == REF 2815 ? memNE(s, locinput, ln) 2816 : (OP(scan) == REFF 2817 ? ibcmp(s, locinput, ln) 2818 : ibcmp_locale(s, locinput, ln)))) 2819 sayNO; 2820 locinput += ln; 2821 nextchr = UCHARAT(locinput); 2822 break; 2823 2824 case NOTHING: 2825 case TAIL: 2826 break; 2827 case BACK: 2828 break; 2829 case EVAL: 2830 { 2831 dSP; 2832 OP_4tree *oop = PL_op; 2833 COP *ocurcop = PL_curcop; 2834 PAD *old_comppad; 2835 SV *ret; 2836 struct regexp *oreg = PL_reg_re; 2837 2838 n = ARG(scan); 2839 PL_op = (OP_4tree*)PL_regdata->data[n]; 2840 DEBUG_r( PerlIO_printf(Perl_debug_log, " re_eval 0x%"UVxf"\n", PTR2UV(PL_op)) ); 2841 PAD_SAVE_LOCAL(old_comppad, (PAD*)PL_regdata->data[n + 2]); 2842 PL_regendp[0] = PL_reg_magic->mg_len = locinput - PL_bostr; 2843 2844 { 2845 SV **before = SP; 2846 CALLRUNOPS(aTHX); /* Scalar context. */ 2847 SPAGAIN; 2848 if (SP == before) 2849 ret = &PL_sv_undef; /* protect against empty (?{}) blocks. */ 2850 else { 2851 ret = POPs; 2852 PUTBACK; 2853 } 2854 } 2855 2856 PL_op = oop; 2857 PAD_RESTORE_LOCAL(old_comppad); 2858 PL_curcop = ocurcop; 2859 if (logical) { 2860 if (logical == 2) { /* Postponed subexpression. */ 2861 regexp *re; 2862 MAGIC *mg = Null(MAGIC*); 2863 re_cc_state state; 2864 CHECKPOINT cp, lastcp; 2865 int toggleutf; 2866 register SV *sv; 2867 2868 if(SvROK(ret) && SvSMAGICAL(sv = SvRV(ret))) 2869 mg = mg_find(sv, PERL_MAGIC_qr); 2870 else if (SvSMAGICAL(ret)) { 2871 if (SvGMAGICAL(ret)) 2872 sv_unmagic(ret, PERL_MAGIC_qr); 2873 else 2874 mg = mg_find(ret, PERL_MAGIC_qr); 2875 } 2876 2877 if (mg) { 2878 re = (regexp *)mg->mg_obj; 2879 (void)ReREFCNT_inc(re); 2880 } 2881 else { 2882 STRLEN len; 2883 char *t = SvPV(ret, len); 2884 PMOP pm; 2885 char *oprecomp = PL_regprecomp; 2886 I32 osize = PL_regsize; 2887 I32 onpar = PL_regnpar; 2888 2889 Zero(&pm, 1, PMOP); 2890 if (DO_UTF8(ret)) pm.op_pmdynflags |= PMdf_DYN_UTF8; 2891 re = CALLREGCOMP(aTHX_ t, t + len, &pm); 2892 if (!(SvFLAGS(ret) 2893 & (SVs_TEMP | SVs_PADTMP | SVf_READONLY 2894 | SVs_GMG))) 2895 sv_magic(ret,(SV*)ReREFCNT_inc(re), 2896 PERL_MAGIC_qr,0,0); 2897 PL_regprecomp = oprecomp; 2898 PL_regsize = osize; 2899 PL_regnpar = onpar; 2900 } 2901 DEBUG_r( 2902 PerlIO_printf(Perl_debug_log, 2903 "Entering embedded `%s%.60s%s%s'\n", 2904 PL_colors[0], 2905 re->precomp, 2906 PL_colors[1], 2907 (strlen(re->precomp) > 60 ? "..." : "")) 2908 ); 2909 state.node = next; 2910 state.prev = PL_reg_call_cc; 2911 state.cc = PL_regcc; 2912 state.re = PL_reg_re; 2913 2914 PL_regcc = 0; 2915 2916 cp = regcppush(0); /* Save *all* the positions. */ 2917 REGCP_SET(lastcp); 2918 cache_re(re); 2919 state.ss = PL_savestack_ix; 2920 *PL_reglastparen = 0; 2921 *PL_reglastcloseparen = 0; 2922 PL_reg_call_cc = &state; 2923 PL_reginput = locinput; 2924 toggleutf = ((PL_reg_flags & RF_utf8) != 0) ^ 2925 ((re->reganch & ROPT_UTF8) != 0); 2926 if (toggleutf) PL_reg_flags ^= RF_utf8; 2927 2928 /* XXXX This is too dramatic a measure... */ 2929 PL_reg_maxiter = 0; 2930 2931 if (regmatch(re->program + 1)) { 2932 /* Even though we succeeded, we need to restore 2933 global variables, since we may be wrapped inside 2934 SUSPEND, thus the match may be not finished yet. */ 2935 2936 /* XXXX Do this only if SUSPENDed? */ 2937 PL_reg_call_cc = state.prev; 2938 PL_regcc = state.cc; 2939 PL_reg_re = state.re; 2940 cache_re(PL_reg_re); 2941 if (toggleutf) PL_reg_flags ^= RF_utf8; 2942 2943 /* XXXX This is too dramatic a measure... */ 2944 PL_reg_maxiter = 0; 2945 2946 /* These are needed even if not SUSPEND. */ 2947 ReREFCNT_dec(re); 2948 regcpblow(cp); 2949 sayYES; 2950 } 2951 ReREFCNT_dec(re); 2952 REGCP_UNWIND(lastcp); 2953 regcppop(); 2954 PL_reg_call_cc = state.prev; 2955 PL_regcc = state.cc; 2956 PL_reg_re = state.re; 2957 cache_re(PL_reg_re); 2958 if (toggleutf) PL_reg_flags ^= RF_utf8; 2959 2960 /* XXXX This is too dramatic a measure... */ 2961 PL_reg_maxiter = 0; 2962 2963 logical = 0; 2964 sayNO; 2965 } 2966 sw = SvTRUE(ret); 2967 logical = 0; 2968 } 2969 else { 2970 sv_setsv(save_scalar(PL_replgv), ret); 2971 cache_re(oreg); 2972 } 2973 break; 2974 } 2975 case OPEN: 2976 n = ARG(scan); /* which paren pair */ 2977 PL_reg_start_tmp[n] = locinput; 2978 if (n > PL_regsize) 2979 PL_regsize = n; 2980 break; 2981 case CLOSE: 2982 n = ARG(scan); /* which paren pair */ 2983 PL_regstartp[n] = PL_reg_start_tmp[n] - PL_bostr; 2984 PL_regendp[n] = locinput - PL_bostr; 2985 if (n > (I32)*PL_reglastparen) 2986 *PL_reglastparen = n; 2987 *PL_reglastcloseparen = n; 2988 break; 2989 case GROUPP: 2990 n = ARG(scan); /* which paren pair */ 2991 sw = ((I32)*PL_reglastparen >= n && PL_regendp[n] != -1); 2992 break; 2993 case IFTHEN: 2994 PL_reg_leftiter = PL_reg_maxiter; /* Void cache */ 2995 if (sw) 2996 next = NEXTOPER(NEXTOPER(scan)); 2997 else { 2998 next = scan + ARG(scan); 2999 if (OP(next) == IFTHEN) /* Fake one. */ 3000 next = NEXTOPER(NEXTOPER(next)); 3001 } 3002 break; 3003 case LOGICAL: 3004 logical = scan->flags; 3005 break; 3006 /******************************************************************* 3007 PL_regcc contains infoblock about the innermost (...)* loop, and 3008 a pointer to the next outer infoblock. 3009 3010 Here is how Y(A)*Z is processed (if it is compiled into CURLYX/WHILEM): 3011 3012 1) After matching X, regnode for CURLYX is processed; 3013 3014 2) This regnode creates infoblock on the stack, and calls 3015 regmatch() recursively with the starting point at WHILEM node; 3016 3017 3) Each hit of WHILEM node tries to match A and Z (in the order 3018 depending on the current iteration, min/max of {min,max} and 3019 greediness). The information about where are nodes for "A" 3020 and "Z" is read from the infoblock, as is info on how many times "A" 3021 was already matched, and greediness. 3022 3023 4) After A matches, the same WHILEM node is hit again. 3024 3025 5) Each time WHILEM is hit, PL_regcc is the infoblock created by CURLYX 3026 of the same pair. Thus when WHILEM tries to match Z, it temporarily 3027 resets PL_regcc, since this Y(A)*Z can be a part of some other loop: 3028 as in (Y(A)*Z)*. If Z matches, the automaton will hit the WHILEM node 3029 of the external loop. 3030 3031 Currently present infoblocks form a tree with a stem formed by PL_curcc 3032 and whatever it mentions via ->next, and additional attached trees 3033 corresponding to temporarily unset infoblocks as in "5" above. 3034 3035 In the following picture infoblocks for outer loop of 3036 (Y(A)*?Z)*?T are denoted O, for inner I. NULL starting block 3037 is denoted by x. The matched string is YAAZYAZT. Temporarily postponed 3038 infoblocks are drawn below the "reset" infoblock. 3039 3040 In fact in the picture below we do not show failed matches for Z and T 3041 by WHILEM blocks. [We illustrate minimal matches, since for them it is 3042 more obvious *why* one needs to *temporary* unset infoblocks.] 3043 3044 Matched REx position InfoBlocks Comment 3045 (Y(A)*?Z)*?T x 3046 Y(A)*?Z)*?T x <- O 3047 Y (A)*?Z)*?T x <- O 3048 Y A)*?Z)*?T x <- O <- I 3049 YA )*?Z)*?T x <- O <- I 3050 YA A)*?Z)*?T x <- O <- I 3051 YAA )*?Z)*?T x <- O <- I 3052 YAA Z)*?T x <- O # Temporary unset I 3053 I 3054 3055 YAAZ Y(A)*?Z)*?T x <- O 3056 I 3057 3058 YAAZY (A)*?Z)*?T x <- O 3059 I 3060 3061 YAAZY A)*?Z)*?T x <- O <- I 3062 I 3063 3064 YAAZYA )*?Z)*?T x <- O <- I 3065 I 3066 3067 YAAZYA Z)*?T x <- O # Temporary unset I 3068 I,I 3069 3070 YAAZYAZ )*?T x <- O 3071 I,I 3072 3073 YAAZYAZ T x # Temporary unset O 3074 O 3075 I,I 3076 3077 YAAZYAZT x 3078 O 3079 I,I 3080 *******************************************************************/ 3081 case CURLYX: { 3082 CURCUR cc; 3083 CHECKPOINT cp = PL_savestack_ix; 3084 /* No need to save/restore up to this paren */ 3085 I32 parenfloor = scan->flags; 3086 3087 if (OP(PREVOPER(next)) == NOTHING) /* LONGJMP */ 3088 next += ARG(next); 3089 cc.oldcc = PL_regcc; 3090 PL_regcc = &cc; 3091 /* XXXX Probably it is better to teach regpush to support 3092 parenfloor > PL_regsize... */ 3093 if (parenfloor > (I32)*PL_reglastparen) 3094 parenfloor = *PL_reglastparen; /* Pessimization... */ 3095 cc.parenfloor = parenfloor; 3096 cc.cur = -1; 3097 cc.min = ARG1(scan); 3098 cc.max = ARG2(scan); 3099 cc.scan = NEXTOPER(scan) + EXTRA_STEP_2ARGS; 3100 cc.next = next; 3101 cc.minmod = minmod; 3102 cc.lastloc = 0; 3103 PL_reginput = locinput; 3104 n = regmatch(PREVOPER(next)); /* start on the WHILEM */ 3105 regcpblow(cp); 3106 PL_regcc = cc.oldcc; 3107 saySAME(n); 3108 } 3109 /* NOT REACHED */ 3110 case WHILEM: { 3111 /* 3112 * This is really hard to understand, because after we match 3113 * what we're trying to match, we must make sure the rest of 3114 * the REx is going to match for sure, and to do that we have 3115 * to go back UP the parse tree by recursing ever deeper. And 3116 * if it fails, we have to reset our parent's current state 3117 * that we can try again after backing off. 3118 */ 3119 3120 CHECKPOINT cp, lastcp; 3121 CURCUR* cc = PL_regcc; 3122 char *lastloc = cc->lastloc; /* Detection of 0-len. */ 3123 3124 n = cc->cur + 1; /* how many we know we matched */ 3125 PL_reginput = locinput; 3126 3127 DEBUG_r( 3128 PerlIO_printf(Perl_debug_log, 3129 "%*s %ld out of %ld..%ld cc=%"UVxf"\n", 3130 REPORT_CODE_OFF+PL_regindent*2, "", 3131 (long)n, (long)cc->min, 3132 (long)cc->max, PTR2UV(cc)) 3133 ); 3134 3135 /* If degenerate scan matches "", assume scan done. */ 3136 3137 if (locinput == cc->lastloc && n >= cc->min) { 3138 PL_regcc = cc->oldcc; 3139 if (PL_regcc) 3140 ln = PL_regcc->cur; 3141 DEBUG_r( 3142 PerlIO_printf(Perl_debug_log, 3143 "%*s empty match detected, try continuation...\n", 3144 REPORT_CODE_OFF+PL_regindent*2, "") 3145 ); 3146 if (regmatch(cc->next)) 3147 sayYES; 3148 if (PL_regcc) 3149 PL_regcc->cur = ln; 3150 PL_regcc = cc; 3151 sayNO; 3152 } 3153 3154 /* First just match a string of min scans. */ 3155 3156 if (n < cc->min) { 3157 cc->cur = n; 3158 cc->lastloc = locinput; 3159 if (regmatch(cc->scan)) 3160 sayYES; 3161 cc->cur = n - 1; 3162 cc->lastloc = lastloc; 3163 sayNO; 3164 } 3165 3166 if (scan->flags) { 3167 /* Check whether we already were at this position. 3168 Postpone detection until we know the match is not 3169 *that* much linear. */ 3170 if (!PL_reg_maxiter) { 3171 PL_reg_maxiter = (PL_regeol - PL_bostr + 1) * (scan->flags>>4); 3172 PL_reg_leftiter = PL_reg_maxiter; 3173 } 3174 if (PL_reg_leftiter-- == 0) { 3175 I32 size = (PL_reg_maxiter + 7)/8; 3176 if (PL_reg_poscache) { 3177 if ((I32)PL_reg_poscache_size < size) { 3178 Renew(PL_reg_poscache, size, char); 3179 PL_reg_poscache_size = size; 3180 } 3181 Zero(PL_reg_poscache, size, char); 3182 } 3183 else { 3184 PL_reg_poscache_size = size; 3185 Newz(29, PL_reg_poscache, size, char); 3186 } 3187 DEBUG_r( 3188 PerlIO_printf(Perl_debug_log, 3189 "%sDetected a super-linear match, switching on caching%s...\n", 3190 PL_colors[4], PL_colors[5]) 3191 ); 3192 } 3193 if (PL_reg_leftiter < 0) { 3194 I32 o = locinput - PL_bostr, b; 3195 3196 o = (scan->flags & 0xf) - 1 + o * (scan->flags>>4); 3197 b = o % 8; 3198 o /= 8; 3199 if (PL_reg_poscache[o] & (1<<b)) { 3200 DEBUG_r( 3201 PerlIO_printf(Perl_debug_log, 3202 "%*s already tried at this position...\n", 3203 REPORT_CODE_OFF+PL_regindent*2, "") 3204 ); 3205 if (PL_reg_flags & RF_false) 3206 sayYES; 3207 else 3208 sayNO_SILENT; 3209 } 3210 PL_reg_poscache[o] |= (1<<b); 3211 } 3212 } 3213 3214 /* Prefer next over scan for minimal matching. */ 3215 3216 if (cc->minmod) { 3217 PL_regcc = cc->oldcc; 3218 if (PL_regcc) 3219 ln = PL_regcc->cur; 3220 cp = regcppush(cc->parenfloor); 3221 REGCP_SET(lastcp); 3222 if (regmatch(cc->next)) { 3223 regcpblow(cp); 3224 sayYES; /* All done. */ 3225 } 3226 REGCP_UNWIND(lastcp); 3227 regcppop(); 3228 if (PL_regcc) 3229 PL_regcc->cur = ln; 3230 PL_regcc = cc; 3231 3232 if (n >= cc->max) { /* Maximum greed exceeded? */ 3233 if (ckWARN(WARN_REGEXP) && n >= REG_INFTY 3234 && !(PL_reg_flags & RF_warned)) { 3235 PL_reg_flags |= RF_warned; 3236 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s limit (%d) exceeded", 3237 "Complex regular subexpression recursion", 3238 REG_INFTY - 1); 3239 } 3240 sayNO; 3241 } 3242 3243 DEBUG_r( 3244 PerlIO_printf(Perl_debug_log, 3245 "%*s trying longer...\n", 3246 REPORT_CODE_OFF+PL_regindent*2, "") 3247 ); 3248 /* Try scanning more and see if it helps. */ 3249 PL_reginput = locinput; 3250 cc->cur = n; 3251 cc->lastloc = locinput; 3252 cp = regcppush(cc->parenfloor); 3253 REGCP_SET(lastcp); 3254 if (regmatch(cc->scan)) { 3255 regcpblow(cp); 3256 sayYES; 3257 } 3258 REGCP_UNWIND(lastcp); 3259 regcppop(); 3260 cc->cur = n - 1; 3261 cc->lastloc = lastloc; 3262 sayNO; 3263 } 3264 3265 /* Prefer scan over next for maximal matching. */ 3266 3267 if (n < cc->max) { /* More greed allowed? */ 3268 cp = regcppush(cc->parenfloor); 3269 cc->cur = n; 3270 cc->lastloc = locinput; 3271 REGCP_SET(lastcp); 3272 if (regmatch(cc->scan)) { 3273 regcpblow(cp); 3274 sayYES; 3275 } 3276 REGCP_UNWIND(lastcp); 3277 regcppop(); /* Restore some previous $<digit>s? */ 3278 PL_reginput = locinput; 3279 DEBUG_r( 3280 PerlIO_printf(Perl_debug_log, 3281 "%*s failed, try continuation...\n", 3282 REPORT_CODE_OFF+PL_regindent*2, "") 3283 ); 3284 } 3285 if (ckWARN(WARN_REGEXP) && n >= REG_INFTY 3286 && !(PL_reg_flags & RF_warned)) { 3287 PL_reg_flags |= RF_warned; 3288 Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s limit (%d) exceeded", 3289 "Complex regular subexpression recursion", 3290 REG_INFTY - 1); 3291 } 3292 3293 /* Failed deeper matches of scan, so see if this one works. */ 3294 PL_regcc = cc->oldcc; 3295 if (PL_regcc) 3296 ln = PL_regcc->cur; 3297 if (regmatch(cc->next)) 3298 sayYES; 3299 if (PL_regcc) 3300 PL_regcc->cur = ln; 3301 PL_regcc = cc; 3302 cc->cur = n - 1; 3303 cc->lastloc = lastloc; 3304 sayNO; 3305 } 3306 /* NOT REACHED */ 3307 case BRANCHJ: 3308 next = scan + ARG(scan); 3309 if (next == scan) 3310 next = NULL; 3311 inner = NEXTOPER(NEXTOPER(scan)); 3312 goto do_branch; 3313 case BRANCH: 3314 inner = NEXTOPER(scan); 3315 do_branch: 3316 { 3317 c1 = OP(scan); 3318 if (OP(next) != c1) /* No choice. */ 3319 next = inner; /* Avoid recursion. */ 3320 else { 3321 I32 lastparen = *PL_reglastparen; 3322 I32 unwind1; 3323 re_unwind_branch_t *uw; 3324 3325 /* Put unwinding data on stack */ 3326 unwind1 = SSNEWt(1,re_unwind_branch_t); 3327 uw = SSPTRt(unwind1,re_unwind_branch_t); 3328 uw->prev = unwind; 3329 unwind = unwind1; 3330 uw->type = ((c1 == BRANCH) 3331 ? RE_UNWIND_BRANCH 3332 : RE_UNWIND_BRANCHJ); 3333 uw->lastparen = lastparen; 3334 uw->next = next; 3335 uw->locinput = locinput; 3336 uw->nextchr = nextchr; 3337 #ifdef DEBUGGING 3338 uw->regindent = ++PL_regindent; 3339 #endif 3340 3341 REGCP_SET(uw->lastcp); 3342 3343 /* Now go into the first branch */ 3344 next = inner; 3345 } 3346 } 3347 break; 3348 case MINMOD: 3349 minmod = 1; 3350 break; 3351 case CURLYM: 3352 { 3353 I32 l = 0; 3354 CHECKPOINT lastcp; 3355 3356 /* We suppose that the next guy does not need 3357 backtracking: in particular, it is of constant length, 3358 and has no parenths to influence future backrefs. */ 3359 ln = ARG1(scan); /* min to match */ 3360 n = ARG2(scan); /* max to match */ 3361 paren = scan->flags; 3362 if (paren) { 3363 if (paren > PL_regsize) 3364 PL_regsize = paren; 3365 if (paren > (I32)*PL_reglastparen) 3366 *PL_reglastparen = paren; 3367 } 3368 scan = NEXTOPER(scan) + NODE_STEP_REGNODE; 3369 if (paren) 3370 scan += NEXT_OFF(scan); /* Skip former OPEN. */ 3371 PL_reginput = locinput; 3372 if (minmod) { 3373 minmod = 0; 3374 if (ln && regrepeat_hard(scan, ln, &l) < ln) 3375 sayNO; 3376 /* if we matched something zero-length we don't need to 3377 backtrack - capturing parens are already defined, so 3378 the caveat in the maximal case doesn't apply 3379 3380 XXXX if ln == 0, we can redo this check first time 3381 through the following loop 3382 */ 3383 if (ln && l == 0) 3384 n = ln; /* don't backtrack */ 3385 locinput = PL_reginput; 3386 if (HAS_TEXT(next) || JUMPABLE(next)) { 3387 regnode *text_node = next; 3388 3389 if (! HAS_TEXT(text_node)) FIND_NEXT_IMPT(text_node); 3390 3391 if (! HAS_TEXT(text_node)) c1 = c2 = -1000; 3392 else { 3393 if (PL_regkind[(U8)OP(text_node)] == REF) { 3394 c1 = c2 = -1000; 3395 goto assume_ok_MM; 3396 } 3397 else { c1 = (U8)*STRING(text_node); } 3398 if (OP(text_node) == EXACTF || OP(text_node) == REFF) 3399 c2 = PL_fold[c1]; 3400 else if (OP(text_node) == EXACTFL || OP(text_node) == REFFL) 3401 c2 = PL_fold_locale[c1]; 3402 else 3403 c2 = c1; 3404 } 3405 } 3406 else 3407 c1 = c2 = -1000; 3408 assume_ok_MM: 3409 REGCP_SET(lastcp); 3410 /* This may be improved if l == 0. */ 3411 while (n >= ln || (n == REG_INFTY && ln > 0 && l)) { /* ln overflow ? */ 3412 /* If it could work, try it. */ 3413 if (c1 == -1000 || 3414 UCHARAT(PL_reginput) == c1 || 3415 UCHARAT(PL_reginput) == c2) 3416 { 3417 if (paren) { 3418 if (ln) { 3419 PL_regstartp[paren] = 3420 HOPc(PL_reginput, -l) - PL_bostr; 3421 PL_regendp[paren] = PL_reginput - PL_bostr; 3422 } 3423 else 3424 PL_regendp[paren] = -1; 3425 } 3426 if (regmatch(next)) 3427 sayYES; 3428 REGCP_UNWIND(lastcp); 3429 } 3430 /* Couldn't or didn't -- move forward. */ 3431 PL_reginput = locinput; 3432 if (regrepeat_hard(scan, 1, &l)) { 3433 ln++; 3434 locinput = PL_reginput; 3435 } 3436 else 3437 sayNO; 3438 } 3439 } 3440 else { 3441 n = regrepeat_hard(scan, n, &l); 3442 /* if we matched something zero-length we don't need to 3443 backtrack, unless the minimum count is zero and we 3444 are capturing the result - in that case the capture 3445 being defined or not may affect later execution 3446 */ 3447 if (n != 0 && l == 0 && !(paren && ln == 0)) 3448 ln = n; /* don't backtrack */ 3449 locinput = PL_reginput; 3450 DEBUG_r( 3451 PerlIO_printf(Perl_debug_log, 3452 "%*s matched %"IVdf" times, len=%"IVdf"...\n", 3453 (int)(REPORT_CODE_OFF+PL_regindent*2), "", 3454 (IV) n, (IV)l) 3455 ); 3456 if (n >= ln) { 3457 if (HAS_TEXT(next) || JUMPABLE(next)) { 3458 regnode *text_node = next; 3459 3460 if (! HAS_TEXT(text_node)) FIND_NEXT_IMPT(text_node); 3461 3462 if (! HAS_TEXT(text_node)) c1 = c2 = -1000; 3463 else { 3464 if (PL_regkind[(U8)OP(text_node)] == REF) { 3465 c1 = c2 = -1000; 3466 goto assume_ok_REG; 3467 } 3468 else { c1 = (U8)*STRING(text_node); } 3469 3470 if (OP(text_node) == EXACTF || OP(text_node) == REFF) 3471 c2 = PL_fold[c1]; 3472 else if (OP(text_node) == EXACTFL || OP(text_node) == REFFL) 3473 c2 = PL_fold_locale[c1]; 3474 else 3475 c2 = c1; 3476 } 3477 } 3478 else 3479 c1 = c2 = -1000; 3480 } 3481 assume_ok_REG: 3482 REGCP_SET(lastcp); 3483 while (n >= ln) { 3484 /* If it could work, try it. */ 3485 if (c1 == -1000 || 3486 UCHARAT(PL_reginput) == c1 || 3487 UCHARAT(PL_reginput) == c2) 3488 { 3489 DEBUG_r( 3490 PerlIO_printf(Perl_debug_log, 3491 "%*s trying tail with n=%"IVdf"...\n", 3492 (int)(REPORT_CODE_OFF+PL_regindent*2), "", (IV)n) 3493 ); 3494 if (paren) { 3495 if (n) { 3496 PL_regstartp[paren] = HOPc(PL_reginput, -l) - PL_bostr; 3497 PL_regendp[paren] = PL_reginput - PL_bostr; 3498 } 3499 else 3500 PL_regendp[paren] = -1; 3501 } 3502 if (regmatch(next)) 3503 sayYES; 3504 REGCP_UNWIND(lastcp); 3505 } 3506 /* Couldn't or didn't -- back up. */ 3507 n--; 3508 locinput = HOPc(locinput, -l); 3509 PL_reginput = locinput; 3510 } 3511 } 3512 sayNO; 3513 break; 3514 } 3515 case CURLYN: 3516 paren = scan->flags; /* Which paren to set */ 3517 if (paren > PL_regsize) 3518 PL_regsize = paren; 3519 if (paren > (I32)*PL_reglastparen) 3520 *PL_reglastparen = paren; 3521 ln = ARG1(scan); /* min to match */ 3522 n = ARG2(scan); /* max to match */ 3523 scan = regnext(NEXTOPER(scan) + NODE_STEP_REGNODE); 3524 goto repeat; 3525 case CURLY: 3526 paren = 0; 3527 ln = ARG1(scan); /* min to match */ 3528 n = ARG2(scan); /* max to match */ 3529 scan = NEXTOPER(scan) + NODE_STEP_REGNODE; 3530 goto repeat; 3531 case STAR: 3532 ln = 0; 3533 n = REG_INFTY; 3534 scan = NEXTOPER(scan); 3535 paren = 0; 3536 goto repeat; 3537 case PLUS: 3538 ln = 1; 3539 n = REG_INFTY; 3540 scan = NEXTOPER(scan); 3541 paren = 0; 3542 repeat: 3543 /* 3544 * Lookahead to avoid useless match attempts 3545 * when we know what character comes next. 3546 */ 3547 3548 /* 3549 * Used to only do .*x and .*?x, but now it allows 3550 * for )'s, ('s and (?{ ... })'s to be in the way 3551 * of the quantifier and the EXACT-like node. -- japhy 3552 */ 3553 3554 if (HAS_TEXT(next) || JUMPABLE(next)) { 3555 U8 *s; 3556 regnode *text_node = next; 3557 3558 if (! HAS_TEXT(text_node)) FIND_NEXT_IMPT(text_node); 3559 3560 if (! HAS_TEXT(text_node)) c1 = c2 = -1000; 3561 else { 3562 if (PL_regkind[(U8)OP(text_node)] == REF) { 3563 c1 = c2 = -1000; 3564 goto assume_ok_easy; 3565 } 3566 else { s = (U8*)STRING(text_node); } 3567 3568 if (!UTF) { 3569 c2 = c1 = *s; 3570 if (OP(text_node) == EXACTF || OP(text_node) == REFF) 3571 c2 = PL_fold[c1]; 3572 else if (OP(text_node) == EXACTFL || OP(text_node) == REFFL) 3573 c2 = PL_fold_locale[c1]; 3574 } 3575 else { /* UTF */ 3576 if (OP(text_node) == EXACTF || OP(text_node) == REFF) { 3577 STRLEN ulen1, ulen2; 3578 U8 tmpbuf1[UTF8_MAXLEN_UCLC+1]; 3579 U8 tmpbuf2[UTF8_MAXLEN_UCLC+1]; 3580 3581 to_utf8_lower((U8*)s, tmpbuf1, &ulen1); 3582 to_utf8_upper((U8*)s, tmpbuf2, &ulen2); 3583 3584 c1 = utf8n_to_uvuni(tmpbuf1, UTF8_MAXLEN, 0, 3585 ckWARN(WARN_UTF8) ? 3586 0 : UTF8_ALLOW_ANY); 3587 c2 = utf8n_to_uvuni(tmpbuf2, UTF8_MAXLEN, 0, 3588 ckWARN(WARN_UTF8) ? 3589 0 : UTF8_ALLOW_ANY); 3590 } 3591 else { 3592 c2 = c1 = utf8n_to_uvchr(s, UTF8_MAXLEN, 0, 3593 ckWARN(WARN_UTF8) ? 3594 0 : UTF8_ALLOW_ANY); 3595 } 3596 } 3597 } 3598 } 3599 else 3600 c1 = c2 = -1000; 3601 assume_ok_easy: 3602 PL_reginput = locinput; 3603 if (minmod) { 3604 CHECKPOINT lastcp; 3605 minmod = 0; 3606 if (ln && regrepeat(scan, ln) < ln) 3607 sayNO; 3608 locinput = PL_reginput; 3609 REGCP_SET(lastcp); 3610 if (c1 != -1000) { 3611 char *e; /* Should not check after this */ 3612 char *old = locinput; 3613 int count = 0; 3614 3615 if (n == REG_INFTY) { 3616 e = PL_regeol - 1; 3617 if (do_utf8) 3618 while (UTF8_IS_CONTINUATION(*(U8*)e)) 3619 e--; 3620 } 3621 else if (do_utf8) { 3622 int m = n - ln; 3623 for (e = locinput; 3624 m >0 && e + UTF8SKIP(e) <= PL_regeol; m--) 3625 e += UTF8SKIP(e); 3626 } 3627 else { 3628 e = locinput + n - ln; 3629 if (e >= PL_regeol) 3630 e = PL_regeol - 1; 3631 } 3632 while (1) { 3633 /* Find place 'next' could work */ 3634 if (!do_utf8) { 3635 if (c1 == c2) { 3636 while (locinput <= e && 3637 UCHARAT(locinput) != c1) 3638 locinput++; 3639 } else { 3640 while (locinput <= e 3641 && UCHARAT(locinput) != c1 3642 && UCHARAT(locinput) != c2) 3643 locinput++; 3644 } 3645 count = locinput - old; 3646 } 3647 else { 3648 STRLEN len; 3649 if (c1 == c2) { 3650 /* count initialised to 3651 * utf8_distance(old, locinput) */ 3652 while (locinput <= e && 3653 utf8n_to_uvchr((U8*)locinput, 3654 UTF8_MAXLEN, &len, 3655 ckWARN(WARN_UTF8) ? 3656 0 : UTF8_ALLOW_ANY) != (UV)c1) { 3657 locinput += len; 3658 count++; 3659 } 3660 } else { 3661 /* count initialised to 3662 * utf8_distance(old, locinput) */ 3663 while (locinput <= e) { 3664 UV c = utf8n_to_uvchr((U8*)locinput, 3665 UTF8_MAXLEN, &len, 3666 ckWARN(WARN_UTF8) ? 3667 0 : UTF8_ALLOW_ANY); 3668 if (c == (UV)c1 || c == (UV)c2) 3669 break; 3670 locinput += len; 3671 count++; 3672 } 3673 } 3674 } 3675 if (locinput > e) 3676 sayNO; 3677 /* PL_reginput == old now */ 3678 if (locinput != old) { 3679 ln = 1; /* Did some */ 3680 if (regrepeat(scan, count) < count) 3681 sayNO; 3682 } 3683 /* PL_reginput == locinput now */ 3684 TRYPAREN(paren, ln, locinput); 3685 PL_reginput = locinput; /* Could be reset... */ 3686 REGCP_UNWIND(lastcp); 3687 /* Couldn't or didn't -- move forward. */ 3688 old = locinput; 3689 if (do_utf8) 3690 locinput += UTF8SKIP(locinput); 3691 else 3692 locinput++; 3693 count = 1; 3694 } 3695 } 3696 else 3697 while (n >= ln || (n == REG_INFTY && ln > 0)) { /* ln overflow ? */ 3698 UV c; 3699 if (c1 != -1000) { 3700 if (do_utf8) 3701 c = utf8n_to_uvchr((U8*)PL_reginput, 3702 UTF8_MAXLEN, 0, 3703 ckWARN(WARN_UTF8) ? 3704 0 : UTF8_ALLOW_ANY); 3705 else 3706 c = UCHARAT(PL_reginput); 3707 /* If it could work, try it. */ 3708 if (c == (UV)c1 || c == (UV)c2) 3709 { 3710 TRYPAREN(paren, ln, PL_reginput); 3711 REGCP_UNWIND(lastcp); 3712 } 3713 } 3714 /* If it could work, try it. */ 3715 else if (c1 == -1000) 3716 { 3717 TRYPAREN(paren, ln, PL_reginput); 3718 REGCP_UNWIND(lastcp); 3719 } 3720 /* Couldn't or didn't -- move forward. */ 3721 PL_reginput = locinput; 3722 if (regrepeat(scan, 1)) { 3723 ln++; 3724 locinput = PL_reginput; 3725 } 3726 else 3727 sayNO; 3728 } 3729 } 3730 else { 3731 CHECKPOINT lastcp; 3732 n = regrepeat(scan, n); 3733 locinput = PL_reginput; 3734 if (ln < n && PL_regkind[(U8)OP(next)] == EOL && 3735 ((!PL_multiline && OP(next) != MEOL) || 3736 OP(next) == SEOL || OP(next) == EOS)) 3737 { 3738 ln = n; /* why back off? */ 3739 /* ...because $ and \Z can match before *and* after 3740 newline at the end. Consider "\n\n" =~ /\n+\Z\n/. 3741 We should back off by one in this case. */ 3742 if (UCHARAT(PL_reginput - 1) == '\n' && OP(next) != EOS) 3743 ln--; 3744 } 3745 REGCP_SET(lastcp); 3746 if (paren) { 3747 UV c = 0; 3748 while (n >= ln) { 3749 if (c1 != -1000) { 3750 if (do_utf8) 3751 c = utf8n_to_uvchr((U8*)PL_reginput, 3752 UTF8_MAXLEN, 0, 3753 ckWARN(WARN_UTF8) ? 3754 0 : UTF8_ALLOW_ANY); 3755 else 3756 c = UCHARAT(PL_reginput); 3757 } 3758 /* If it could work, try it. */ 3759 if (c1 == -1000 || c == (UV)c1 || c == (UV)c2) 3760 { 3761 TRYPAREN(paren, n, PL_reginput); 3762 REGCP_UNWIND(lastcp); 3763 } 3764 /* Couldn't or didn't -- back up. */ 3765 n--; 3766 PL_reginput = locinput = HOPc(locinput, -1); 3767 } 3768 } 3769 else { 3770 UV c = 0; 3771 while (n >= ln) { 3772 if (c1 != -1000) { 3773 if (do_utf8) 3774 c = utf8n_to_uvchr((U8*)PL_reginput, 3775 UTF8_MAXLEN, 0, 3776 ckWARN(WARN_UTF8) ? 3777 0 : UTF8_ALLOW_ANY); 3778 else 3779 c = UCHARAT(PL_reginput); 3780 } 3781 /* If it could work, try it. */ 3782 if (c1 == -1000 || c == (UV)c1 || c == (UV)c2) 3783 { 3784 TRYPAREN(paren, n, PL_reginput); 3785 REGCP_UNWIND(lastcp); 3786 } 3787 /* Couldn't or didn't -- back up. */ 3788 n--; 3789 PL_reginput = locinput = HOPc(locinput, -1); 3790 } 3791 } 3792 } 3793 sayNO; 3794 break; 3795 case END: 3796 if (PL_reg_call_cc) { 3797 re_cc_state *cur_call_cc = PL_reg_call_cc; 3798 CURCUR *cctmp = PL_regcc; 3799 regexp *re = PL_reg_re; 3800 CHECKPOINT cp, lastcp; 3801 3802 cp = regcppush(0); /* Save *all* the positions. */ 3803 REGCP_SET(lastcp); 3804 regcp_set_to(PL_reg_call_cc->ss); /* Restore parens of 3805 the caller. */ 3806 PL_reginput = locinput; /* Make position available to 3807 the callcc. */ 3808 cache_re(PL_reg_call_cc->re); 3809 PL_regcc = PL_reg_call_cc->cc; 3810 PL_reg_call_cc = PL_reg_call_cc->prev; 3811 if (regmatch(cur_call_cc->node)) { 3812 PL_reg_call_cc = cur_call_cc; 3813 regcpblow(cp); 3814 sayYES; 3815 } 3816 REGCP_UNWIND(lastcp); 3817 regcppop(); 3818 PL_reg_call_cc = cur_call_cc; 3819 PL_regcc = cctmp; 3820 PL_reg_re = re; 3821 cache_re(re); 3822 3823 DEBUG_r( 3824 PerlIO_printf(Perl_debug_log, 3825 "%*s continuation failed...\n", 3826 REPORT_CODE_OFF+PL_regindent*2, "") 3827 ); 3828 sayNO_SILENT; 3829 } 3830 if (locinput < PL_regtill) { 3831 DEBUG_r(PerlIO_printf(Perl_debug_log, 3832 "%sMatch possible, but length=%ld is smaller than requested=%ld, failing!%s\n", 3833 PL_colors[4], 3834 (long)(locinput - PL_reg_starttry), 3835 (long)(PL_regtill - PL_reg_starttry), 3836 PL_colors[5])); 3837 sayNO_FINAL; /* Cannot match: too short. */ 3838 } 3839 PL_reginput = locinput; /* put where regtry can find it */ 3840 sayYES_FINAL; /* Success! */ 3841 case SUCCEED: 3842 PL_reginput = locinput; /* put where regtry can find it */ 3843 sayYES_LOUD; /* Success! */ 3844 case SUSPEND: 3845 n = 1; 3846 PL_reginput = locinput; 3847 goto do_ifmatch; 3848 case UNLESSM: 3849 n = 0; 3850 if (scan->flags) { 3851 s = HOPBACKc(locinput, scan->flags); 3852 if (!s) 3853 goto say_yes; 3854 PL_reginput = s; 3855 } 3856 else 3857 PL_reginput = locinput; 3858 PL_reg_flags ^= RF_false; 3859 goto do_ifmatch; 3860 case IFMATCH: 3861 n = 1; 3862 if (scan->flags) { 3863 s = HOPBACKc(locinput, scan->flags); 3864 if (!s) 3865 goto say_no; 3866 PL_reginput = s; 3867 } 3868 else 3869 PL_reginput = locinput; 3870 3871 do_ifmatch: 3872 inner = NEXTOPER(NEXTOPER(scan)); 3873 if (regmatch(inner) != n) { 3874 if (n == 0) 3875 PL_reg_flags ^= RF_false; 3876 say_no: 3877 if (logical) { 3878 logical = 0; 3879 sw = 0; 3880 goto do_longjump; 3881 } 3882 else 3883 sayNO; 3884 } 3885 if (n == 0) 3886 PL_reg_flags ^= RF_false; 3887 say_yes: 3888 if (logical) { 3889 logical = 0; 3890 sw = 1; 3891 } 3892 if (OP(scan) == SUSPEND) { 3893 locinput = PL_reginput; 3894 nextchr = UCHARAT(locinput); 3895 } 3896 /* FALL THROUGH. */ 3897 case LONGJMP: 3898 do_longjump: 3899 next = scan + ARG(scan); 3900 if (next == scan) 3901 next = NULL; 3902 break; 3903 default: 3904 PerlIO_printf(Perl_error_log, "%"UVxf" %d\n", 3905 PTR2UV(scan), OP(scan)); 3906 Perl_croak(aTHX_ "regexp memory corruption"); 3907 } 3908 reenter: 3909 scan = next; 3910 } 3911 3912 /* 3913 * We get here only if there's trouble -- normally "case END" is 3914 * the terminating point. 3915 */ 3916 Perl_croak(aTHX_ "corrupted regexp pointers"); 3917 /*NOTREACHED*/ 3918 sayNO; 3919 3920 yes_loud: 3921 DEBUG_r( 3922 PerlIO_printf(Perl_debug_log, 3923 "%*s %scould match...%s\n", 3924 REPORT_CODE_OFF+PL_regindent*2, "", PL_colors[4],PL_colors[5]) 3925 ); 3926 goto yes; 3927 yes_final: 3928 DEBUG_r(PerlIO_printf(Perl_debug_log, "%sMatch successful!%s\n", 3929 PL_colors[4],PL_colors[5])); 3930 yes: 3931 #ifdef DEBUGGING 3932 PL_regindent--; 3933 #endif 3934 3935 #if 0 /* Breaks $^R */ 3936 if (unwind) 3937 regcpblow(firstcp); 3938 #endif 3939 return 1; 3940 3941 no: 3942 DEBUG_r( 3943 PerlIO_printf(Perl_debug_log, 3944 "%*s %sfailed...%s\n", 3945 REPORT_CODE_OFF+PL_regindent*2, "",PL_colors[4],PL_colors[5]) 3946 ); 3947 goto do_no; 3948 no_final: 3949 do_no: 3950 if (unwind) { 3951 re_unwind_t *uw = SSPTRt(unwind,re_unwind_t); 3952 3953 switch (uw->type) { 3954 case RE_UNWIND_BRANCH: 3955 case RE_UNWIND_BRANCHJ: 3956 { 3957 re_unwind_branch_t *uwb = &(uw->branch); 3958 I32 lastparen = uwb->lastparen; 3959 3960 REGCP_UNWIND(uwb->lastcp); 3961 for (n = *PL_reglastparen; n > lastparen; n--) 3962 PL_regendp[n] = -1; 3963 *PL_reglastparen = n; 3964 scan = next = uwb->next; 3965 if ( !scan || 3966 OP(scan) != (uwb->type == RE_UNWIND_BRANCH 3967 ? BRANCH : BRANCHJ) ) { /* Failure */ 3968 unwind = uwb->prev; 3969 #ifdef DEBUGGING 3970 PL_regindent--; 3971 #endif 3972 goto do_no; 3973 } 3974 /* Have more choice yet. Reuse the same uwb. */ 3975 /*SUPPRESS 560*/ 3976 if ((n = (uwb->type == RE_UNWIND_BRANCH 3977 ? NEXT_OFF(next) : ARG(next)))) 3978 next += n; 3979 else 3980 next = NULL; /* XXXX Needn't unwinding in this case... */ 3981 uwb->next = next; 3982 next = NEXTOPER(scan); 3983 if (uwb->type == RE_UNWIND_BRANCHJ) 3984 next = NEXTOPER(next); 3985 locinput = uwb->locinput; 3986 nextchr = uwb->nextchr; 3987 #ifdef DEBUGGING 3988 PL_regindent = uwb->regindent; 3989 #endif 3990 3991 goto reenter; 3992 } 3993 /* NOT REACHED */ 3994 default: 3995 Perl_croak(aTHX_ "regexp unwind memory corruption"); 3996 } 3997 /* NOT REACHED */ 3998 } 3999 #ifdef DEBUGGING 4000 PL_regindent--; 4001 #endif 4002 return 0; 4003 } 4004 4005 /* 4006 - regrepeat - repeatedly match something simple, report how many 4007 */ 4008 /* 4009 * [This routine now assumes that it will only match on things of length 1. 4010 * That was true before, but now we assume scan - reginput is the count, 4011 * rather than incrementing count on every character. [Er, except utf8.]] 4012 */ 4013 STATIC I32 4014 S_regrepeat(pTHX_ regnode *p, I32 max) 4015 { 4016 register char *scan; 4017 register I32 c; 4018 register char *loceol = PL_regeol; 4019 register I32 hardcount = 0; 4020 register bool do_utf8 = PL_reg_match_utf8; 4021 4022 scan = PL_reginput; 4023 if (max == REG_INFTY) 4024 max = I32_MAX; 4025 else if (max < loceol - scan) 4026 loceol = scan + max; 4027 switch (OP(p)) { 4028 case REG_ANY: 4029 if (do_utf8) { 4030 loceol = PL_regeol; 4031 while (scan < loceol && hardcount < max && *scan != '\n') { 4032 scan += UTF8SKIP(scan); 4033 hardcount++; 4034 } 4035 } else { 4036 while (scan < loceol && *scan != '\n') 4037 scan++; 4038 } 4039 break; 4040 case SANY: 4041 if (do_utf8) { 4042 loceol = PL_regeol; 4043 while (scan < loceol && hardcount < max) { 4044 scan += UTF8SKIP(scan); 4045 hardcount++; 4046 } 4047 } 4048 else 4049 scan = loceol; 4050 break; 4051 case CANY: 4052 scan = loceol; 4053 break; 4054 case EXACT: /* length of string is 1 */ 4055 c = (U8)*STRING(p); 4056 while (scan < loceol && UCHARAT(scan) == c) 4057 scan++; 4058 break; 4059 case EXACTF: /* length of string is 1 */ 4060 c = (U8)*STRING(p); 4061 while (scan < loceol && 4062 (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold[c])) 4063 scan++; 4064 break; 4065 case EXACTFL: /* length of string is 1 */ 4066 PL_reg_flags |= RF_tainted; 4067 c = (U8)*STRING(p); 4068 while (scan < loceol && 4069 (UCHARAT(scan) == c || UCHARAT(scan) == PL_fold_locale[c])) 4070 scan++; 4071 break; 4072 case ANYOF: 4073 if (do_utf8) { 4074 loceol = PL_regeol; 4075 while (hardcount < max && scan < loceol && 4076 reginclass(p, (U8*)scan, 0, do_utf8)) { 4077 scan += UTF8SKIP(scan); 4078 hardcount++; 4079 } 4080 } else { 4081 while (scan < loceol && REGINCLASS(p, (U8*)scan)) 4082 scan++; 4083 } 4084 break; 4085 case ALNUM: 4086 if (do_utf8) { 4087 loceol = PL_regeol; 4088 LOAD_UTF8_CHARCLASS(alnum,"a"); 4089 while (hardcount < max && scan < loceol && 4090 swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) { 4091 scan += UTF8SKIP(scan); 4092 hardcount++; 4093 } 4094 } else { 4095 while (scan < loceol && isALNUM(*scan)) 4096 scan++; 4097 } 4098 break; 4099 case ALNUML: 4100 PL_reg_flags |= RF_tainted; 4101 if (do_utf8) { 4102 loceol = PL_regeol; 4103 while (hardcount < max && scan < loceol && 4104 isALNUM_LC_utf8((U8*)scan)) { 4105 scan += UTF8SKIP(scan); 4106 hardcount++; 4107 } 4108 } else { 4109 while (scan < loceol && isALNUM_LC(*scan)) 4110 scan++; 4111 } 4112 break; 4113 case NALNUM: 4114 if (do_utf8) { 4115 loceol = PL_regeol; 4116 LOAD_UTF8_CHARCLASS(alnum,"a"); 4117 while (hardcount < max && scan < loceol && 4118 !swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) { 4119 scan += UTF8SKIP(scan); 4120 hardcount++; 4121 } 4122 } else { 4123 while (scan < loceol && !isALNUM(*scan)) 4124 scan++; 4125 } 4126 break; 4127 case NALNUML: 4128 PL_reg_flags |= RF_tainted; 4129 if (do_utf8) { 4130 loceol = PL_regeol; 4131 while (hardcount < max && scan < loceol && 4132 !isALNUM_LC_utf8((U8*)scan)) { 4133 scan += UTF8SKIP(scan); 4134 hardcount++; 4135 } 4136 } else { 4137 while (scan < loceol && !isALNUM_LC(*scan)) 4138 scan++; 4139 } 4140 break; 4141 case SPACE: 4142 if (do_utf8) { 4143 loceol = PL_regeol; 4144 LOAD_UTF8_CHARCLASS(space," "); 4145 while (hardcount < max && scan < loceol && 4146 (*scan == ' ' || 4147 swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) { 4148 scan += UTF8SKIP(scan); 4149 hardcount++; 4150 } 4151 } else { 4152 while (scan < loceol && isSPACE(*scan)) 4153 scan++; 4154 } 4155 break; 4156 case SPACEL: 4157 PL_reg_flags |= RF_tainted; 4158 if (do_utf8) { 4159 loceol = PL_regeol; 4160 while (hardcount < max && scan < loceol && 4161 (*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) { 4162 scan += UTF8SKIP(scan); 4163 hardcount++; 4164 } 4165 } else { 4166 while (scan < loceol && isSPACE_LC(*scan)) 4167 scan++; 4168 } 4169 break; 4170 case NSPACE: 4171 if (do_utf8) { 4172 loceol = PL_regeol; 4173 LOAD_UTF8_CHARCLASS(space," "); 4174 while (hardcount < max && scan < loceol && 4175 !(*scan == ' ' || 4176 swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) { 4177 scan += UTF8SKIP(scan); 4178 hardcount++; 4179 } 4180 } else { 4181 while (scan < loceol && !isSPACE(*scan)) 4182 scan++; 4183 break; 4184 } 4185 case NSPACEL: 4186 PL_reg_flags |= RF_tainted; 4187 if (do_utf8) { 4188 loceol = PL_regeol; 4189 while (hardcount < max && scan < loceol && 4190 !(*scan == ' ' || isSPACE_LC_utf8((U8*)scan))) { 4191 scan += UTF8SKIP(scan); 4192 hardcount++; 4193 } 4194 } else { 4195 while (scan < loceol && !isSPACE_LC(*scan)) 4196 scan++; 4197 } 4198 break; 4199 case DIGIT: 4200 if (do_utf8) { 4201 loceol = PL_regeol; 4202 LOAD_UTF8_CHARCLASS(digit,"0"); 4203 while (hardcount < max && scan < loceol && 4204 swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) { 4205 scan += UTF8SKIP(scan); 4206 hardcount++; 4207 } 4208 } else { 4209 while (scan < loceol && isDIGIT(*scan)) 4210 scan++; 4211 } 4212 break; 4213 case NDIGIT: 4214 if (do_utf8) { 4215 loceol = PL_regeol; 4216 LOAD_UTF8_CHARCLASS(digit,"0"); 4217 while (hardcount < max && scan < loceol && 4218 !swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) { 4219 scan += UTF8SKIP(scan); 4220 hardcount++; 4221 } 4222 } else { 4223 while (scan < loceol && !isDIGIT(*scan)) 4224 scan++; 4225 } 4226 break; 4227 default: /* Called on something of 0 width. */ 4228 break; /* So match right here or not at all. */ 4229 } 4230 4231 if (hardcount) 4232 c = hardcount; 4233 else 4234 c = scan - PL_reginput; 4235 PL_reginput = scan; 4236 4237 DEBUG_r( 4238 { 4239 SV *prop = sv_newmortal(); 4240 4241 regprop(prop, p); 4242 PerlIO_printf(Perl_debug_log, 4243 "%*s %s can match %"IVdf" times out of %"IVdf"...\n", 4244 REPORT_CODE_OFF+1, "", SvPVX(prop),(IV)c,(IV)max); 4245 }); 4246 4247 return(c); 4248 } 4249 4250 /* 4251 - regrepeat_hard - repeatedly match something, report total lenth and length 4252 * 4253 * The repeater is supposed to have constant length. 4254 */ 4255 4256 STATIC I32 4257 S_regrepeat_hard(pTHX_ regnode *p, I32 max, I32 *lp) 4258 { 4259 register char *scan = Nullch; 4260 register char *start; 4261 register char *loceol = PL_regeol; 4262 I32 l = 0; 4263 I32 count = 0, res = 1; 4264 4265 if (!max) 4266 return 0; 4267 4268 start = PL_reginput; 4269 if (PL_reg_match_utf8) { 4270 while (PL_reginput < loceol && (scan = PL_reginput, res = regmatch(p))) { 4271 if (!count++) { 4272 l = 0; 4273 while (start < PL_reginput) { 4274 l++; 4275 start += UTF8SKIP(start); 4276 } 4277 *lp = l; 4278 if (l == 0) 4279 return max; 4280 } 4281 if (count == max) 4282 return count; 4283 } 4284 } 4285 else { 4286 while (PL_reginput < loceol && (scan = PL_reginput, res = regmatch(p))) { 4287 if (!count++) { 4288 *lp = l = PL_reginput - start; 4289 if (max != REG_INFTY && l*max < loceol - scan) 4290 loceol = scan + l*max; 4291 if (l == 0) 4292 return max; 4293 } 4294 } 4295 } 4296 if (!res) 4297 PL_reginput = scan; 4298 4299 return count; 4300 } 4301 4302 /* 4303 - regclass_swash - prepare the utf8 swash 4304 */ 4305 4306 SV * 4307 Perl_regclass_swash(pTHX_ register regnode* node, bool doinit, SV** listsvp, SV **altsvp) 4308 { 4309 SV *sw = NULL; 4310 SV *si = NULL; 4311 SV *alt = NULL; 4312 4313 if (PL_regdata && PL_regdata->count) { 4314 U32 n = ARG(node); 4315 4316 if (PL_regdata->what[n] == 's') { 4317 SV *rv = (SV*)PL_regdata->data[n]; 4318 AV *av = (AV*)SvRV((SV*)rv); 4319 SV **ary = AvARRAY(av); 4320 SV **a, **b; 4321 4322 /* See the end of regcomp.c:S_reglass() for 4323 * documentation of these array elements. */ 4324 4325 si = *ary; 4326 a = SvTYPE(ary[1]) == SVt_RV ? &ary[1] : 0; 4327 b = SvTYPE(ary[2]) == SVt_PVAV ? &ary[2] : 0; 4328 4329 if (a) 4330 sw = *a; 4331 else if (si && doinit) { 4332 sw = swash_init("utf8", "", si, 1, 0); 4333 (void)av_store(av, 1, sw); 4334 } 4335 if (b) 4336 alt = *b; 4337 } 4338 } 4339 4340 if (listsvp) 4341 *listsvp = si; 4342 if (altsvp) 4343 *altsvp = alt; 4344 4345 return sw; 4346 } 4347 4348 /* 4349 - reginclass - determine if a character falls into a character class 4350 4351 The n is the ANYOF regnode, the p is the target string, lenp 4352 is pointer to the maximum length of how far to go in the p 4353 (if the lenp is zero, UTF8SKIP(p) is used), 4354 do_utf8 tells whether the target string is in UTF-8. 4355 4356 */ 4357 4358 STATIC bool 4359 S_reginclass(pTHX_ register regnode *n, register U8* p, STRLEN* lenp, register bool do_utf8) 4360 { 4361 char flags = ANYOF_FLAGS(n); 4362 bool match = FALSE; 4363 UV c = *p; 4364 STRLEN len = 0; 4365 STRLEN plen; 4366 4367 if (do_utf8 && !UTF8_IS_INVARIANT(c)) 4368 c = utf8n_to_uvchr(p, UTF8_MAXLEN, &len, 4369 ckWARN(WARN_UTF8) ? 0 : UTF8_ALLOW_ANY); 4370 4371 plen = lenp ? *lenp : UNISKIP(NATIVE_TO_UNI(c)); 4372 if (do_utf8 || (flags & ANYOF_UNICODE)) { 4373 if (lenp) 4374 *lenp = 0; 4375 if (do_utf8 && !ANYOF_RUNTIME(n)) { 4376 if (len != (STRLEN)-1 && c < 256 && ANYOF_BITMAP_TEST(n, c)) 4377 match = TRUE; 4378 } 4379 if (!match && do_utf8 && (flags & ANYOF_UNICODE_ALL) && c >= 256) 4380 match = TRUE; 4381 if (!match) { 4382 AV *av; 4383 SV *sw = regclass_swash(n, TRUE, 0, (SV**)&av); 4384 4385 if (sw) { 4386 if (swash_fetch(sw, p, do_utf8)) 4387 match = TRUE; 4388 else if (flags & ANYOF_FOLD) { 4389 if (!match && lenp && av) { 4390 I32 i; 4391 4392 for (i = 0; i <= av_len(av); i++) { 4393 SV* sv = *av_fetch(av, i, FALSE); 4394 STRLEN len; 4395 char *s = SvPV(sv, len); 4396 4397 if (len <= plen && memEQ(s, (char*)p, len)) { 4398 *lenp = len; 4399 match = TRUE; 4400 break; 4401 } 4402 } 4403 } 4404 if (!match) { 4405 U8 tmpbuf[UTF8_MAXLEN_FOLD+1]; 4406 STRLEN tmplen; 4407 4408 to_utf8_fold(p, tmpbuf, &tmplen); 4409 if (swash_fetch(sw, tmpbuf, do_utf8)) 4410 match = TRUE; 4411 } 4412 } 4413 } 4414 } 4415 if (match && lenp && *lenp == 0) 4416 *lenp = UNISKIP(NATIVE_TO_UNI(c)); 4417 } 4418 if (!match && c < 256) { 4419 if (ANYOF_BITMAP_TEST(n, c)) 4420 match = TRUE; 4421 else if (flags & ANYOF_FOLD) { 4422 U8 f; 4423 4424 if (flags & ANYOF_LOCALE) { 4425 PL_reg_flags |= RF_tainted; 4426 f = PL_fold_locale[c]; 4427 } 4428 else 4429 f = PL_fold[c]; 4430 if (f != c && ANYOF_BITMAP_TEST(n, f)) 4431 match = TRUE; 4432 } 4433 4434 if (!match && (flags & ANYOF_CLASS)) { 4435 PL_reg_flags |= RF_tainted; 4436 if ( 4437 (ANYOF_CLASS_TEST(n, ANYOF_ALNUM) && isALNUM_LC(c)) || 4438 (ANYOF_CLASS_TEST(n, ANYOF_NALNUM) && !isALNUM_LC(c)) || 4439 (ANYOF_CLASS_TEST(n, ANYOF_SPACE) && isSPACE_LC(c)) || 4440 (ANYOF_CLASS_TEST(n, ANYOF_NSPACE) && !isSPACE_LC(c)) || 4441 (ANYOF_CLASS_TEST(n, ANYOF_DIGIT) && isDIGIT_LC(c)) || 4442 (ANYOF_CLASS_TEST(n, ANYOF_NDIGIT) && !isDIGIT_LC(c)) || 4443 (ANYOF_CLASS_TEST(n, ANYOF_ALNUMC) && isALNUMC_LC(c)) || 4444 (ANYOF_CLASS_TEST(n, ANYOF_NALNUMC) && !isALNUMC_LC(c)) || 4445 (ANYOF_CLASS_TEST(n, ANYOF_ALPHA) && isALPHA_LC(c)) || 4446 (ANYOF_CLASS_TEST(n, ANYOF_NALPHA) && !isALPHA_LC(c)) || 4447 (ANYOF_CLASS_TEST(n, ANYOF_ASCII) && isASCII(c)) || 4448 (ANYOF_CLASS_TEST(n, ANYOF_NASCII) && !isASCII(c)) || 4449 (ANYOF_CLASS_TEST(n, ANYOF_CNTRL) && isCNTRL_LC(c)) || 4450 (ANYOF_CLASS_TEST(n, ANYOF_NCNTRL) && !isCNTRL_LC(c)) || 4451 (ANYOF_CLASS_TEST(n, ANYOF_GRAPH) && isGRAPH_LC(c)) || 4452 (ANYOF_CLASS_TEST(n, ANYOF_NGRAPH) && !isGRAPH_LC(c)) || 4453 (ANYOF_CLASS_TEST(n, ANYOF_LOWER) && isLOWER_LC(c)) || 4454 (ANYOF_CLASS_TEST(n, ANYOF_NLOWER) && !isLOWER_LC(c)) || 4455 (ANYOF_CLASS_TEST(n, ANYOF_PRINT) && isPRINT_LC(c)) || 4456 (ANYOF_CLASS_TEST(n, ANYOF_NPRINT) && !isPRINT_LC(c)) || 4457 (ANYOF_CLASS_TEST(n, ANYOF_PUNCT) && isPUNCT_LC(c)) || 4458 (ANYOF_CLASS_TEST(n, ANYOF_NPUNCT) && !isPUNCT_LC(c)) || 4459 (ANYOF_CLASS_TEST(n, ANYOF_UPPER) && isUPPER_LC(c)) || 4460 (ANYOF_CLASS_TEST(n, ANYOF_NUPPER) && !isUPPER_LC(c)) || 4461 (ANYOF_CLASS_TEST(n, ANYOF_XDIGIT) && isXDIGIT(c)) || 4462 (ANYOF_CLASS_TEST(n, ANYOF_NXDIGIT) && !isXDIGIT(c)) || 4463 (ANYOF_CLASS_TEST(n, ANYOF_PSXSPC) && isPSXSPC(c)) || 4464 (ANYOF_CLASS_TEST(n, ANYOF_NPSXSPC) && !isPSXSPC(c)) || 4465 (ANYOF_CLASS_TEST(n, ANYOF_BLANK) && isBLANK(c)) || 4466 (ANYOF_CLASS_TEST(n, ANYOF_NBLANK) && !isBLANK(c)) 4467 ) /* How's that for a conditional? */ 4468 { 4469 match = TRUE; 4470 } 4471 } 4472 } 4473 4474 return (flags & ANYOF_INVERT) ? !match : match; 4475 } 4476 4477 STATIC U8 * 4478 S_reghop(pTHX_ U8 *s, I32 off) 4479 { 4480 return S_reghop3(aTHX_ s, off, (U8*)(off >= 0 ? PL_regeol : PL_bostr)); 4481 } 4482 4483 STATIC U8 * 4484 S_reghop3(pTHX_ U8 *s, I32 off, U8* lim) 4485 { 4486 if (off >= 0) { 4487 while (off-- && s < lim) { 4488 /* XXX could check well-formedness here */ 4489 s += UTF8SKIP(s); 4490 } 4491 } 4492 else { 4493 while (off++) { 4494 if (s > lim) { 4495 s--; 4496 if (UTF8_IS_CONTINUED(*s)) { 4497 while (s > (U8*)lim && UTF8_IS_CONTINUATION(*s)) 4498 s--; 4499 } 4500 /* XXX could check well-formedness here */ 4501 } 4502 } 4503 } 4504 return s; 4505 } 4506 4507 STATIC U8 * 4508 S_reghopmaybe(pTHX_ U8 *s, I32 off) 4509 { 4510 return S_reghopmaybe3(aTHX_ s, off, (U8*)(off >= 0 ? PL_regeol : PL_bostr)); 4511 } 4512 4513 STATIC U8 * 4514 S_reghopmaybe3(pTHX_ U8* s, I32 off, U8* lim) 4515 { 4516 if (off >= 0) { 4517 while (off-- && s < lim) { 4518 /* XXX could check well-formedness here */ 4519 s += UTF8SKIP(s); 4520 } 4521 if (off >= 0) 4522 return 0; 4523 } 4524 else { 4525 while (off++) { 4526 if (s > lim) { 4527 s--; 4528 if (UTF8_IS_CONTINUED(*s)) { 4529 while (s > (U8*)lim && UTF8_IS_CONTINUATION(*s)) 4530 s--; 4531 } 4532 /* XXX could check well-formedness here */ 4533 } 4534 else 4535 break; 4536 } 4537 if (off <= 0) 4538 return 0; 4539 } 4540 return s; 4541 } 4542 4543 static void 4544 restore_pos(pTHX_ void *arg) 4545 { 4546 if (PL_reg_eval_set) { 4547 if (PL_reg_oldsaved) { 4548 PL_reg_re->subbeg = PL_reg_oldsaved; 4549 PL_reg_re->sublen = PL_reg_oldsavedlen; 4550 RX_MATCH_COPIED_on(PL_reg_re); 4551 } 4552 PL_reg_magic->mg_len = PL_reg_oldpos; 4553 PL_reg_eval_set = 0; 4554 PL_curpm = PL_reg_oldcurpm; 4555 } 4556 } 4557 4558 STATIC void 4559 S_to_utf8_substr(pTHX_ register regexp *prog) 4560 { 4561 SV* sv; 4562 if (prog->float_substr && !prog->float_utf8) { 4563 prog->float_utf8 = sv = NEWSV(117, 0); 4564 SvSetSV(sv, prog->float_substr); 4565 sv_utf8_upgrade(sv); 4566 if (SvTAIL(prog->float_substr)) 4567 SvTAIL_on(sv); 4568 if (prog->float_substr == prog->check_substr) 4569 prog->check_utf8 = sv; 4570 } 4571 if (prog->anchored_substr && !prog->anchored_utf8) { 4572 prog->anchored_utf8 = sv = NEWSV(118, 0); 4573 SvSetSV(sv, prog->anchored_substr); 4574 sv_utf8_upgrade(sv); 4575 if (SvTAIL(prog->anchored_substr)) 4576 SvTAIL_on(sv); 4577 if (prog->anchored_substr == prog->check_substr) 4578 prog->check_utf8 = sv; 4579 } 4580 } 4581 4582 STATIC void 4583 S_to_byte_substr(pTHX_ register regexp *prog) 4584 { 4585 SV* sv; 4586 if (prog->float_utf8 && !prog->float_substr) { 4587 prog->float_substr = sv = NEWSV(117, 0); 4588 SvSetSV(sv, prog->float_utf8); 4589 if (sv_utf8_downgrade(sv, TRUE)) { 4590 if (SvTAIL(prog->float_utf8)) 4591 SvTAIL_on(sv); 4592 } else { 4593 SvREFCNT_dec(sv); 4594 prog->float_substr = sv = &PL_sv_undef; 4595 } 4596 if (prog->float_utf8 == prog->check_utf8) 4597 prog->check_substr = sv; 4598 } 4599 if (prog->anchored_utf8 && !prog->anchored_substr) { 4600 prog->anchored_substr = sv = NEWSV(118, 0); 4601 SvSetSV(sv, prog->anchored_utf8); 4602 if (sv_utf8_downgrade(sv, TRUE)) { 4603 if (SvTAIL(prog->anchored_utf8)) 4604 SvTAIL_on(sv); 4605 } else { 4606 SvREFCNT_dec(sv); 4607 prog->anchored_substr = sv = &PL_sv_undef; 4608 } 4609 if (prog->anchored_utf8 == prog->check_utf8) 4610 prog->check_substr = sv; 4611 } 4612 } 4613