| 1 |
/*************************************************
|
| 2 |
* Perl-Compatible Regular Expressions *
|
| 3 |
*************************************************/
|
| 4 |
|
| 5 |
/* PCRE is a library of functions to support regular expressions whose syntax
|
| 6 |
and semantics are as close as possible to those of the Perl 5 language.
|
| 7 |
|
| 8 |
Written by Philip Hazel
|
| 9 |
Copyright (c) 1997-2010 University of Cambridge
|
| 10 |
|
| 11 |
-----------------------------------------------------------------------------
|
| 12 |
Redistribution and use in source and binary forms, with or without
|
| 13 |
modification, are permitted provided that the following conditions are met:
|
| 14 |
|
| 15 |
* Redistributions of source code must retain the above copyright notice,
|
| 16 |
this list of conditions and the following disclaimer.
|
| 17 |
|
| 18 |
* Redistributions in binary form must reproduce the above copyright
|
| 19 |
notice, this list of conditions and the following disclaimer in the
|
| 20 |
documentation and/or other materials provided with the distribution.
|
| 21 |
|
| 22 |
* Neither the name of the University of Cambridge nor the names of its
|
| 23 |
contributors may be used to endorse or promote products derived from
|
| 24 |
this software without specific prior written permission.
|
| 25 |
|
| 26 |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
| 27 |
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
| 28 |
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
| 29 |
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
| 30 |
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
| 31 |
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
| 32 |
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
| 33 |
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
| 34 |
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
| 35 |
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
| 36 |
POSSIBILITY OF SUCH DAMAGE.
|
| 37 |
-----------------------------------------------------------------------------
|
| 38 |
*/
|
| 39 |
|
| 40 |
|
| 41 |
/* This module contains the external function pcre_study(), along with local
|
| 42 |
supporting functions. */
|
| 43 |
|
| 44 |
|
| 45 |
#ifdef HAVE_CONFIG_H
|
| 46 |
#include "config.h"
|
| 47 |
#endif
|
| 48 |
|
| 49 |
#include "pcre_internal.h"
|
| 50 |
|
| 51 |
#define SET_BIT(c) start_bits[c/8] |= (1 << (c&7))
|
| 52 |
|
| 53 |
/* Returns from set_start_bits() */
|
| 54 |
|
| 55 |
enum { SSB_FAIL, SSB_DONE, SSB_CONTINUE, SSB_UNKNOWN };
|
| 56 |
|
| 57 |
|
| 58 |
|
| 59 |
/*************************************************
|
| 60 |
* Find the minimum subject length for a group *
|
| 61 |
*************************************************/
|
| 62 |
|
| 63 |
/* Scan a parenthesized group and compute the minimum length of subject that
|
| 64 |
is needed to match it. This is a lower bound; it does not mean there is a
|
| 65 |
string of that length that matches. In UTF8 mode, the result is in characters
|
| 66 |
rather than bytes.
|
| 67 |
|
| 68 |
Arguments:
|
| 69 |
code pointer to start of group (the bracket)
|
| 70 |
startcode pointer to start of the whole pattern
|
| 71 |
options the compiling options
|
| 72 |
had_accept pointer to flag for (*ACCEPT) encountered
|
| 73 |
int RECURSE depth
|
| 74 |
|
| 75 |
Returns: the minimum length
|
| 76 |
-1 if \C was encountered
|
| 77 |
-2 internal error (missing capturing bracket)
|
| 78 |
-3 internal error (opcode not listed)
|
| 79 |
*/
|
| 80 |
|
| 81 |
static int
|
| 82 |
find_minlength(const uschar *code, const uschar *startcode, int options,
|
| 83 |
BOOL *had_accept_ptr, int recurse_depth)
|
| 84 |
{
|
| 85 |
int length = -1;
|
| 86 |
BOOL utf8 = (options & PCRE_UTF8) != 0;
|
| 87 |
BOOL had_recurse = FALSE;
|
| 88 |
register int branchlength = 0;
|
| 89 |
register uschar *cc = (uschar *)code + 1 + LINK_SIZE;
|
| 90 |
|
| 91 |
if (*code == OP_CBRA || *code == OP_SCBRA ||
|
| 92 |
*code == OP_CBRAPOS || *code == OP_SCBRAPOS) cc += 2;
|
| 93 |
|
| 94 |
/* Scan along the opcodes for this branch. If we get to the end of the
|
| 95 |
branch, check the length against that of the other branches. */
|
| 96 |
|
| 97 |
for (;;)
|
| 98 |
{
|
| 99 |
int d, min;
|
| 100 |
uschar *cs, *ce;
|
| 101 |
register int op = *cc;
|
| 102 |
|
| 103 |
switch (op)
|
| 104 |
{
|
| 105 |
case OP_COND:
|
| 106 |
case OP_SCOND:
|
| 107 |
|
| 108 |
/* If there is only one branch in a condition, the implied branch has zero
|
| 109 |
length, so we don't add anything. This covers the DEFINE "condition"
|
| 110 |
automatically. */
|
| 111 |
|
| 112 |
cs = cc + GET(cc, 1);
|
| 113 |
if (*cs != OP_ALT)
|
| 114 |
{
|
| 115 |
cc = cs + 1 + LINK_SIZE;
|
| 116 |
break;
|
| 117 |
}
|
| 118 |
|
| 119 |
/* Otherwise we can fall through and treat it the same as any other
|
| 120 |
subpattern. */
|
| 121 |
|
| 122 |
case OP_CBRA:
|
| 123 |
case OP_SCBRA:
|
| 124 |
case OP_BRA:
|
| 125 |
case OP_SBRA:
|
| 126 |
case OP_CBRAPOS:
|
| 127 |
case OP_SCBRAPOS:
|
| 128 |
case OP_BRAPOS:
|
| 129 |
case OP_SBRAPOS:
|
| 130 |
case OP_ONCE:
|
| 131 |
d = find_minlength(cc, startcode, options, had_accept_ptr, recurse_depth);
|
| 132 |
if (d < 0) return d;
|
| 133 |
branchlength += d;
|
| 134 |
if (*had_accept_ptr) return branchlength;
|
| 135 |
do cc += GET(cc, 1); while (*cc == OP_ALT);
|
| 136 |
cc += 1 + LINK_SIZE;
|
| 137 |
break;
|
| 138 |
|
| 139 |
/* Reached end of a branch; if it's a ket it is the end of a nested
|
| 140 |
call. If it's ALT it is an alternation in a nested call. If it is END it's
|
| 141 |
the end of the outer call. All can be handled by the same code. If it is
|
| 142 |
ACCEPT, it is essentially the same as END, but we set a flag so that
|
| 143 |
counting stops. */
|
| 144 |
|
| 145 |
case OP_ACCEPT:
|
| 146 |
case OP_ASSERT_ACCEPT:
|
| 147 |
*had_accept_ptr = TRUE;
|
| 148 |
/* Fall through */
|
| 149 |
case OP_ALT:
|
| 150 |
case OP_KET:
|
| 151 |
case OP_KETRMAX:
|
| 152 |
case OP_KETRMIN:
|
| 153 |
case OP_KETRPOS:
|
| 154 |
case OP_END:
|
| 155 |
if (length < 0 || (!had_recurse && branchlength < length))
|
| 156 |
length = branchlength;
|
| 157 |
if (op != OP_ALT) return length;
|
| 158 |
cc += 1 + LINK_SIZE;
|
| 159 |
branchlength = 0;
|
| 160 |
had_recurse = FALSE;
|
| 161 |
break;
|
| 162 |
|
| 163 |
/* Skip over assertive subpatterns */
|
| 164 |
|
| 165 |
case OP_ASSERT:
|
| 166 |
case OP_ASSERT_NOT:
|
| 167 |
case OP_ASSERTBACK:
|
| 168 |
case OP_ASSERTBACK_NOT:
|
| 169 |
do cc += GET(cc, 1); while (*cc == OP_ALT);
|
| 170 |
/* Fall through */
|
| 171 |
|
| 172 |
/* Skip over things that don't match chars */
|
| 173 |
|
| 174 |
case OP_REVERSE:
|
| 175 |
case OP_CREF:
|
| 176 |
case OP_NCREF:
|
| 177 |
case OP_RREF:
|
| 178 |
case OP_NRREF:
|
| 179 |
case OP_DEF:
|
| 180 |
case OP_CALLOUT:
|
| 181 |
case OP_SOD:
|
| 182 |
case OP_SOM:
|
| 183 |
case OP_EOD:
|
| 184 |
case OP_EODN:
|
| 185 |
case OP_CIRC:
|
| 186 |
case OP_CIRCM:
|
| 187 |
case OP_DOLL:
|
| 188 |
case OP_DOLLM:
|
| 189 |
case OP_NOT_WORD_BOUNDARY:
|
| 190 |
case OP_WORD_BOUNDARY:
|
| 191 |
cc += _pcre_OP_lengths[*cc];
|
| 192 |
break;
|
| 193 |
|
| 194 |
/* Skip over a subpattern that has a {0} or {0,x} quantifier */
|
| 195 |
|
| 196 |
case OP_BRAZERO:
|
| 197 |
case OP_BRAMINZERO:
|
| 198 |
case OP_BRAPOSZERO:
|
| 199 |
case OP_SKIPZERO:
|
| 200 |
cc += _pcre_OP_lengths[*cc];
|
| 201 |
do cc += GET(cc, 1); while (*cc == OP_ALT);
|
| 202 |
cc += 1 + LINK_SIZE;
|
| 203 |
break;
|
| 204 |
|
| 205 |
/* Handle literal characters and + repetitions */
|
| 206 |
|
| 207 |
case OP_CHAR:
|
| 208 |
case OP_CHARI:
|
| 209 |
case OP_NOT:
|
| 210 |
case OP_NOTI:
|
| 211 |
case OP_PLUS:
|
| 212 |
case OP_PLUSI:
|
| 213 |
case OP_MINPLUS:
|
| 214 |
case OP_MINPLUSI:
|
| 215 |
case OP_POSPLUS:
|
| 216 |
case OP_POSPLUSI:
|
| 217 |
case OP_NOTPLUS:
|
| 218 |
case OP_NOTPLUSI:
|
| 219 |
case OP_NOTMINPLUS:
|
| 220 |
case OP_NOTMINPLUSI:
|
| 221 |
case OP_NOTPOSPLUS:
|
| 222 |
case OP_NOTPOSPLUSI:
|
| 223 |
branchlength++;
|
| 224 |
cc += 2;
|
| 225 |
#ifdef SUPPORT_UTF8
|
| 226 |
if (utf8 && cc[-1] >= 0xc0) cc += _pcre_utf8_table4[cc[-1] & 0x3f];
|
| 227 |
#endif
|
| 228 |
break;
|
| 229 |
|
| 230 |
case OP_TYPEPLUS:
|
| 231 |
case OP_TYPEMINPLUS:
|
| 232 |
case OP_TYPEPOSPLUS:
|
| 233 |
branchlength++;
|
| 234 |
cc += (cc[1] == OP_PROP || cc[1] == OP_NOTPROP)? 4 : 2;
|
| 235 |
break;
|
| 236 |
|
| 237 |
/* Handle exact repetitions. The count is already in characters, but we
|
| 238 |
need to skip over a multibyte character in UTF8 mode. */
|
| 239 |
|
| 240 |
case OP_EXACT:
|
| 241 |
case OP_EXACTI:
|
| 242 |
case OP_NOTEXACT:
|
| 243 |
case OP_NOTEXACTI:
|
| 244 |
branchlength += GET2(cc,1);
|
| 245 |
cc += 4;
|
| 246 |
#ifdef SUPPORT_UTF8
|
| 247 |
if (utf8 && cc[-1] >= 0xc0) cc += _pcre_utf8_table4[cc[-1] & 0x3f];
|
| 248 |
#endif
|
| 249 |
break;
|
| 250 |
|
| 251 |
case OP_TYPEEXACT:
|
| 252 |
branchlength += GET2(cc,1);
|
| 253 |
cc += (cc[3] == OP_PROP || cc[3] == OP_NOTPROP)? 6 : 4;
|
| 254 |
break;
|
| 255 |
|
| 256 |
/* Handle single-char non-literal matchers */
|
| 257 |
|
| 258 |
case OP_PROP:
|
| 259 |
case OP_NOTPROP:
|
| 260 |
cc += 2;
|
| 261 |
/* Fall through */
|
| 262 |
|
| 263 |
case OP_NOT_DIGIT:
|
| 264 |
case OP_DIGIT:
|
| 265 |
case OP_NOT_WHITESPACE:
|
| 266 |
case OP_WHITESPACE:
|
| 267 |
case OP_NOT_WORDCHAR:
|
| 268 |
case OP_WORDCHAR:
|
| 269 |
case OP_ANY:
|
| 270 |
case OP_ALLANY:
|
| 271 |
case OP_EXTUNI:
|
| 272 |
case OP_HSPACE:
|
| 273 |
case OP_NOT_HSPACE:
|
| 274 |
case OP_VSPACE:
|
| 275 |
case OP_NOT_VSPACE:
|
| 276 |
branchlength++;
|
| 277 |
cc++;
|
| 278 |
break;
|
| 279 |
|
| 280 |
/* "Any newline" might match two characters, but it also might match just
|
| 281 |
one. */
|
| 282 |
|
| 283 |
case OP_ANYNL:
|
| 284 |
branchlength += 1;
|
| 285 |
cc++;
|
| 286 |
break;
|
| 287 |
|
| 288 |
/* The single-byte matcher means we can't proceed in UTF-8 mode */
|
| 289 |
|
| 290 |
case OP_ANYBYTE:
|
| 291 |
#ifdef SUPPORT_UTF8
|
| 292 |
if (utf8) return -1;
|
| 293 |
#endif
|
| 294 |
branchlength++;
|
| 295 |
cc++;
|
| 296 |
break;
|
| 297 |
|
| 298 |
/* For repeated character types, we have to test for \p and \P, which have
|
| 299 |
an extra two bytes of parameters. */
|
| 300 |
|
| 301 |
case OP_TYPESTAR:
|
| 302 |
case OP_TYPEMINSTAR:
|
| 303 |
case OP_TYPEQUERY:
|
| 304 |
case OP_TYPEMINQUERY:
|
| 305 |
case OP_TYPEPOSSTAR:
|
| 306 |
case OP_TYPEPOSQUERY:
|
| 307 |
if (cc[1] == OP_PROP || cc[1] == OP_NOTPROP) cc += 2;
|
| 308 |
cc += _pcre_OP_lengths[op];
|
| 309 |
break;
|
| 310 |
|
| 311 |
case OP_TYPEUPTO:
|
| 312 |
case OP_TYPEMINUPTO:
|
| 313 |
case OP_TYPEPOSUPTO:
|
| 314 |
if (cc[3] == OP_PROP || cc[3] == OP_NOTPROP) cc += 2;
|
| 315 |
cc += _pcre_OP_lengths[op];
|
| 316 |
break;
|
| 317 |
|
| 318 |
/* Check a class for variable quantification */
|
| 319 |
|
| 320 |
#ifdef SUPPORT_UTF8
|
| 321 |
case OP_XCLASS:
|
| 322 |
cc += GET(cc, 1) - 33;
|
| 323 |
/* Fall through */
|
| 324 |
#endif
|
| 325 |
|
| 326 |
case OP_CLASS:
|
| 327 |
case OP_NCLASS:
|
| 328 |
cc += 33;
|
| 329 |
|
| 330 |
switch (*cc)
|
| 331 |
{
|
| 332 |
case OP_CRPLUS:
|
| 333 |
case OP_CRMINPLUS:
|
| 334 |
branchlength++;
|
| 335 |
/* Fall through */
|
| 336 |
|
| 337 |
case OP_CRSTAR:
|
| 338 |
case OP_CRMINSTAR:
|
| 339 |
case OP_CRQUERY:
|
| 340 |
case OP_CRMINQUERY:
|
| 341 |
cc++;
|
| 342 |
break;
|
| 343 |
|
| 344 |
case OP_CRRANGE:
|
| 345 |
case OP_CRMINRANGE:
|
| 346 |
branchlength += GET2(cc,1);
|
| 347 |
cc += 5;
|
| 348 |
break;
|
| 349 |
|
| 350 |
default:
|
| 351 |
branchlength++;
|
| 352 |
break;
|
| 353 |
}
|
| 354 |
break;
|
| 355 |
|
| 356 |
/* Backreferences and subroutine calls are treated in the same way: we find
|
| 357 |
the minimum length for the subpattern. A recursion, however, causes an
|
| 358 |
a flag to be set that causes the length of this branch to be ignored. The
|
| 359 |
logic is that a recursion can only make sense if there is another
|
| 360 |
alternation that stops the recursing. That will provide the minimum length
|
| 361 |
(when no recursion happens). A backreference within the group that it is
|
| 362 |
referencing behaves in the same way.
|
| 363 |
|
| 364 |
If PCRE_JAVASCRIPT_COMPAT is set, a backreference to an unset bracket
|
| 365 |
matches an empty string (by default it causes a matching failure), so in
|
| 366 |
that case we must set the minimum length to zero. */
|
| 367 |
|
| 368 |
case OP_REF:
|
| 369 |
case OP_REFI:
|
| 370 |
if ((options & PCRE_JAVASCRIPT_COMPAT) == 0)
|
| 371 |
{
|
| 372 |
ce = cs = (uschar *)_pcre_find_bracket(startcode, utf8, GET2(cc, 1));
|
| 373 |
if (cs == NULL) return -2;
|
| 374 |
do ce += GET(ce, 1); while (*ce == OP_ALT);
|
| 375 |
if (cc > cs && cc < ce)
|
| 376 |
{
|
| 377 |
d = 0;
|
| 378 |
had_recurse = TRUE;
|
| 379 |
}
|
| 380 |
else
|
| 381 |
{
|
| 382 |
d = find_minlength(cs, startcode, options, had_accept_ptr,
|
| 383 |
recurse_depth);
|
| 384 |
*had_accept_ptr = FALSE;
|
| 385 |
}
|
| 386 |
}
|
| 387 |
else d = 0;
|
| 388 |
cc += 3;
|
| 389 |
|
| 390 |
/* Handle repeated back references */
|
| 391 |
|
| 392 |
switch (*cc)
|
| 393 |
{
|
| 394 |
case OP_CRSTAR:
|
| 395 |
case OP_CRMINSTAR:
|
| 396 |
case OP_CRQUERY:
|
| 397 |
case OP_CRMINQUERY:
|
| 398 |
min = 0;
|
| 399 |
cc++;
|
| 400 |
break;
|
| 401 |
|
| 402 |
case OP_CRPLUS:
|
| 403 |
case OP_CRMINPLUS:
|
| 404 |
min = 1;
|
| 405 |
cc++;
|
| 406 |
break;
|
| 407 |
|
| 408 |
case OP_CRRANGE:
|
| 409 |
case OP_CRMINRANGE:
|
| 410 |
min = GET2(cc, 1);
|
| 411 |
cc += 5;
|
| 412 |
break;
|
| 413 |
|
| 414 |
default:
|
| 415 |
min = 1;
|
| 416 |
break;
|
| 417 |
}
|
| 418 |
|
| 419 |
branchlength += min * d;
|
| 420 |
break;
|
| 421 |
|
| 422 |
/* We can easily detect direct recursion, but not mutual recursion. This is
|
| 423 |
caught by a recursion depth count. */
|
| 424 |
|
| 425 |
case OP_RECURSE:
|
| 426 |
cs = ce = (uschar *)startcode + GET(cc, 1);
|
| 427 |
if (cs == NULL) return -2;
|
| 428 |
do ce += GET(ce, 1); while (*ce == OP_ALT);
|
| 429 |
if ((cc > cs && cc < ce) || recurse_depth > 10)
|
| 430 |
had_recurse = TRUE;
|
| 431 |
else
|
| 432 |
{
|
| 433 |
branchlength += find_minlength(cs, startcode, options, had_accept_ptr,
|
| 434 |
recurse_depth + 1);
|
| 435 |
*had_accept_ptr = FALSE;
|
| 436 |
}
|
| 437 |
cc += 1 + LINK_SIZE;
|
| 438 |
break;
|
| 439 |
|
| 440 |
/* Anything else does not or need not match a character. We can get the
|
| 441 |
item's length from the table, but for those that can match zero occurrences
|
| 442 |
of a character, we must take special action for UTF-8 characters. As it
|
| 443 |
happens, the "NOT" versions of these opcodes are used at present only for
|
| 444 |
ASCII characters, so they could be omitted from this list. However, in
|
| 445 |
future that may change, so we include them here so as not to leave a
|
| 446 |
gotcha for a future maintainer. */
|
| 447 |
|
| 448 |
case OP_UPTO:
|
| 449 |
case OP_UPTOI:
|
| 450 |
case OP_NOTUPTO:
|
| 451 |
case OP_NOTUPTOI:
|
| 452 |
case OP_MINUPTO:
|
| 453 |
case OP_MINUPTOI:
|
| 454 |
case OP_NOTMINUPTO:
|
| 455 |
case OP_NOTMINUPTOI:
|
| 456 |
case OP_POSUPTO:
|
| 457 |
case OP_POSUPTOI:
|
| 458 |
case OP_NOTPOSUPTO:
|
| 459 |
case OP_NOTPOSUPTOI:
|
| 460 |
|
| 461 |
case OP_STAR:
|
| 462 |
case OP_STARI:
|
| 463 |
case OP_NOTSTAR:
|
| 464 |
case OP_NOTSTARI:
|
| 465 |
case OP_MINSTAR:
|
| 466 |
case OP_MINSTARI:
|
| 467 |
case OP_NOTMINSTAR:
|
| 468 |
case OP_NOTMINSTARI:
|
| 469 |
case OP_POSSTAR:
|
| 470 |
case OP_POSSTARI:
|
| 471 |
case OP_NOTPOSSTAR:
|
| 472 |
case OP_NOTPOSSTARI:
|
| 473 |
|
| 474 |
case OP_QUERY:
|
| 475 |
case OP_QUERYI:
|
| 476 |
case OP_NOTQUERY:
|
| 477 |
case OP_NOTQUERYI:
|
| 478 |
case OP_MINQUERY:
|
| 479 |
case OP_MINQUERYI:
|
| 480 |
case OP_NOTMINQUERY:
|
| 481 |
case OP_NOTMINQUERYI:
|
| 482 |
case OP_POSQUERY:
|
| 483 |
case OP_POSQUERYI:
|
| 484 |
case OP_NOTPOSQUERY:
|
| 485 |
case OP_NOTPOSQUERYI:
|
| 486 |
|
| 487 |
cc += _pcre_OP_lengths[op];
|
| 488 |
#ifdef SUPPORT_UTF8
|
| 489 |
if (utf8 && cc[-1] >= 0xc0) cc += _pcre_utf8_table4[cc[-1] & 0x3f];
|
| 490 |
#endif
|
| 491 |
break;
|
| 492 |
|
| 493 |
/* Skip these, but we need to add in the name length. */
|
| 494 |
|
| 495 |
case OP_MARK:
|
| 496 |
case OP_PRUNE_ARG:
|
| 497 |
case OP_SKIP_ARG:
|
| 498 |
cc += _pcre_OP_lengths[op] + cc[1];
|
| 499 |
break;
|
| 500 |
|
| 501 |
case OP_THEN_ARG:
|
| 502 |
cc += _pcre_OP_lengths[op] + cc[1+LINK_SIZE];
|
| 503 |
break;
|
| 504 |
|
| 505 |
/* The remaining opcodes are just skipped over. */
|
| 506 |
|
| 507 |
case OP_CLOSE:
|
| 508 |
case OP_COMMIT:
|
| 509 |
case OP_FAIL:
|
| 510 |
case OP_PRUNE:
|
| 511 |
case OP_SET_SOM:
|
| 512 |
case OP_SKIP:
|
| 513 |
case OP_THEN:
|
| 514 |
cc += _pcre_OP_lengths[op];
|
| 515 |
break;
|
| 516 |
|
| 517 |
/* This should not occur: we list all opcodes explicitly so that when
|
| 518 |
new ones get added they are properly considered. */
|
| 519 |
|
| 520 |
default:
|
| 521 |
return -3;
|
| 522 |
}
|
| 523 |
}
|
| 524 |
/* Control never gets here */
|
| 525 |
}
|
| 526 |
|
| 527 |
|
| 528 |
|
| 529 |
/*************************************************
|
| 530 |
* Set a bit and maybe its alternate case *
|
| 531 |
*************************************************/
|
| 532 |
|
| 533 |
/* Given a character, set its first byte's bit in the table, and also the
|
| 534 |
corresponding bit for the other version of a letter if we are caseless. In
|
| 535 |
UTF-8 mode, for characters greater than 127, we can only do the caseless thing
|
| 536 |
when Unicode property support is available.
|
| 537 |
|
| 538 |
Arguments:
|
| 539 |
start_bits points to the bit map
|
| 540 |
p points to the character
|
| 541 |
caseless the caseless flag
|
| 542 |
cd the block with char table pointers
|
| 543 |
utf8 TRUE for UTF-8 mode
|
| 544 |
|
| 545 |
Returns: pointer after the character
|
| 546 |
*/
|
| 547 |
|
| 548 |
static const uschar *
|
| 549 |
set_table_bit(uschar *start_bits, const uschar *p, BOOL caseless,
|
| 550 |
compile_data *cd, BOOL utf8)
|
| 551 |
{
|
| 552 |
unsigned int c = *p;
|
| 553 |
|
| 554 |
SET_BIT(c);
|
| 555 |
|
| 556 |
#ifdef SUPPORT_UTF8
|
| 557 |
if (utf8 && c > 127)
|
| 558 |
{
|
| 559 |
GETCHARINC(c, p);
|
| 560 |
#ifdef SUPPORT_UCP
|
| 561 |
if (caseless)
|
| 562 |
{
|
| 563 |
uschar buff[8];
|
| 564 |
c = UCD_OTHERCASE(c);
|
| 565 |
(void)_pcre_ord2utf8(c, buff);
|
| 566 |
SET_BIT(buff[0]);
|
| 567 |
}
|
| 568 |
#endif
|
| 569 |
return p;
|
| 570 |
}
|
| 571 |
#endif
|
| 572 |
|
| 573 |
/* Not UTF-8 mode, or character is less than 127. */
|
| 574 |
|
| 575 |
if (caseless && (cd->ctypes[c] & ctype_letter) != 0) SET_BIT(cd->fcc[c]);
|
| 576 |
return p + 1;
|
| 577 |
}
|
| 578 |
|
| 579 |
|
| 580 |
|
| 581 |
/*************************************************
|
| 582 |
* Set bits for a positive character type *
|
| 583 |
*************************************************/
|
| 584 |
|
| 585 |
/* This function sets starting bits for a character type. In UTF-8 mode, we can
|
| 586 |
only do a direct setting for bytes less than 128, as otherwise there can be
|
| 587 |
confusion with bytes in the middle of UTF-8 characters. In a "traditional"
|
| 588 |
environment, the tables will only recognize ASCII characters anyway, but in at
|
| 589 |
least one Windows environment, some higher bytes bits were set in the tables.
|
| 590 |
So we deal with that case by considering the UTF-8 encoding.
|
| 591 |
|
| 592 |
Arguments:
|
| 593 |
start_bits the starting bitmap
|
| 594 |
cbit type the type of character wanted
|
| 595 |
table_limit 32 for non-UTF-8; 16 for UTF-8
|
| 596 |
cd the block with char table pointers
|
| 597 |
|
| 598 |
Returns: nothing
|
| 599 |
*/
|
| 600 |
|
| 601 |
static void
|
| 602 |
set_type_bits(uschar *start_bits, int cbit_type, int table_limit,
|
| 603 |
compile_data *cd)
|
| 604 |
{
|
| 605 |
register int c;
|
| 606 |
for (c = 0; c < table_limit; c++) start_bits[c] |= cd->cbits[c+cbit_type];
|
| 607 |
if (table_limit == 32) return;
|
| 608 |
for (c = 128; c < 256; c++)
|
| 609 |
{
|
| 610 |
if ((cd->cbits[c/8] & (1 << (c&7))) != 0)
|
| 611 |
{
|
| 612 |
uschar buff[8];
|
| 613 |
(void)_pcre_ord2utf8(c, buff);
|
| 614 |
SET_BIT(buff[0]);
|
| 615 |
}
|
| 616 |
}
|
| 617 |
}
|
| 618 |
|
| 619 |
|
| 620 |
/*************************************************
|
| 621 |
* Set bits for a negative character type *
|
| 622 |
*************************************************/
|
| 623 |
|
| 624 |
/* This function sets starting bits for a negative character type such as \D.
|
| 625 |
In UTF-8 mode, we can only do a direct setting for bytes less than 128, as
|
| 626 |
otherwise there can be confusion with bytes in the middle of UTF-8 characters.
|
| 627 |
Unlike in the positive case, where we can set appropriate starting bits for
|
| 628 |
specific high-valued UTF-8 characters, in this case we have to set the bits for
|
| 629 |
all high-valued characters. The lowest is 0xc2, but we overkill by starting at
|
| 630 |
0xc0 (192) for simplicity.
|
| 631 |
|
| 632 |
Arguments:
|
| 633 |
start_bits the starting bitmap
|
| 634 |
cbit type the type of character wanted
|
| 635 |
table_limit 32 for non-UTF-8; 16 for UTF-8
|
| 636 |
cd the block with char table pointers
|
| 637 |
|
| 638 |
Returns: nothing
|
| 639 |
*/
|
| 640 |
|
| 641 |
static void
|
| 642 |
set_nottype_bits(uschar *start_bits, int cbit_type, int table_limit,
|
| 643 |
compile_data *cd)
|
| 644 |
{
|
| 645 |
register int c;
|
| 646 |
for (c = 0; c < table_limit; c++) start_bits[c] |= ~cd->cbits[c+cbit_type];
|
| 647 |
if (table_limit != 32) for (c = 24; c < 32; c++) start_bits[c] = 0xff;
|
| 648 |
}
|
| 649 |
|
| 650 |
|
| 651 |
|
| 652 |
/*************************************************
|
| 653 |
* Create bitmap of starting bytes *
|
| 654 |
*************************************************/
|
| 655 |
|
| 656 |
/* This function scans a compiled unanchored expression recursively and
|
| 657 |
attempts to build a bitmap of the set of possible starting bytes. As time goes
|
| 658 |
by, we may be able to get more clever at doing this. The SSB_CONTINUE return is
|
| 659 |
useful for parenthesized groups in patterns such as (a*)b where the group
|
| 660 |
provides some optional starting bytes but scanning must continue at the outer
|
| 661 |
level to find at least one mandatory byte. At the outermost level, this
|
| 662 |
function fails unless the result is SSB_DONE.
|
| 663 |
|
| 664 |
Arguments:
|
| 665 |
code points to an expression
|
| 666 |
start_bits points to a 32-byte table, initialized to 0
|
| 667 |
utf8 TRUE if in UTF-8 mode
|
| 668 |
cd the block with char table pointers
|
| 669 |
|
| 670 |
Returns: SSB_FAIL => Failed to find any starting bytes
|
| 671 |
SSB_DONE => Found mandatory starting bytes
|
| 672 |
SSB_CONTINUE => Found optional starting bytes
|
| 673 |
SSB_UNKNOWN => Hit an unrecognized opcode
|
| 674 |
*/
|
| 675 |
|
| 676 |
static int
|
| 677 |
set_start_bits(const uschar *code, uschar *start_bits, BOOL utf8,
|
| 678 |
compile_data *cd)
|
| 679 |
{
|
| 680 |
register int c;
|
| 681 |
int yield = SSB_DONE;
|
| 682 |
int table_limit = utf8? 16:32;
|
| 683 |
|
| 684 |
#if 0
|
| 685 |
/* ========================================================================= */
|
| 686 |
/* The following comment and code was inserted in January 1999. In May 2006,
|
| 687 |
when it was observed to cause compiler warnings about unused values, I took it
|
| 688 |
out again. If anybody is still using OS/2, they will have to put it back
|
| 689 |
manually. */
|
| 690 |
|
| 691 |
/* This next statement and the later reference to dummy are here in order to
|
| 692 |
trick the optimizer of the IBM C compiler for OS/2 into generating correct
|
| 693 |
code. Apparently IBM isn't going to fix the problem, and we would rather not
|
| 694 |
disable optimization (in this module it actually makes a big difference, and
|
| 695 |
the pcre module can use all the optimization it can get). */
|
| 696 |
|
| 697 |
volatile int dummy;
|
| 698 |
/* ========================================================================= */
|
| 699 |
#endif
|
| 700 |
|
| 701 |
do
|
| 702 |
{
|
| 703 |
BOOL try_next = TRUE;
|
| 704 |
const uschar *tcode = code + 1 + LINK_SIZE;
|
| 705 |
|
| 706 |
if (*code == OP_CBRA || *code == OP_SCBRA ||
|
| 707 |
*code == OP_CBRAPOS || *code == OP_SCBRAPOS) tcode += 2;
|
| 708 |
|
| 709 |
while (try_next) /* Loop for items in this branch */
|
| 710 |
{
|
| 711 |
int rc;
|
| 712 |
|
| 713 |
switch(*tcode)
|
| 714 |
{
|
| 715 |
/* If we reach something we don't understand, it means a new opcode has
|
| 716 |
been created that hasn't been added to this code. Hopefully this problem
|
| 717 |
will be discovered during testing. */
|
| 718 |
|
| 719 |
default:
|
| 720 |
return SSB_UNKNOWN;
|
| 721 |
|
| 722 |
/* Fail for a valid opcode that implies no starting bits. */
|
| 723 |
|
| 724 |
case OP_ACCEPT:
|
| 725 |
case OP_ASSERT_ACCEPT:
|
| 726 |
case OP_ALLANY:
|
| 727 |
case OP_ANY:
|
| 728 |
case OP_ANYBYTE:
|
| 729 |
case OP_CIRC:
|
| 730 |
case OP_CIRCM:
|
| 731 |
case OP_CLOSE:
|
| 732 |
case OP_COMMIT:
|
| 733 |
case OP_COND:
|
| 734 |
case OP_CREF:
|
| 735 |
case OP_DEF:
|
| 736 |
case OP_DOLL:
|
| 737 |
case OP_DOLLM:
|
| 738 |
case OP_END:
|
| 739 |
case OP_EOD:
|
| 740 |
case OP_EODN:
|
| 741 |
case OP_EXTUNI:
|
| 742 |
case OP_FAIL:
|
| 743 |
case OP_MARK:
|
| 744 |
case OP_NCREF:
|
| 745 |
case OP_NOT:
|
| 746 |
case OP_NOTEXACT:
|
| 747 |
case OP_NOTEXACTI:
|
| 748 |
case OP_NOTI:
|
| 749 |
case OP_NOTMINPLUS:
|
| 750 |
case OP_NOTMINPLUSI:
|
| 751 |
case OP_NOTMINQUERY:
|
| 752 |
case OP_NOTMINQUERYI:
|
| 753 |
case OP_NOTMINSTAR:
|
| 754 |
case OP_NOTMINSTARI:
|
| 755 |
case OP_NOTMINUPTO:
|
| 756 |
case OP_NOTMINUPTOI:
|
| 757 |
case OP_NOTPLUS:
|
| 758 |
case OP_NOTPLUSI:
|
| 759 |
case OP_NOTPOSPLUS:
|
| 760 |
case OP_NOTPOSPLUSI:
|
| 761 |
case OP_NOTPOSQUERY:
|
| 762 |
case OP_NOTPOSQUERYI:
|
| 763 |
case OP_NOTPOSSTAR:
|
| 764 |
case OP_NOTPOSSTARI:
|
| 765 |
case OP_NOTPOSUPTO:
|
| 766 |
case OP_NOTPOSUPTOI:
|
| 767 |
case OP_NOTPROP:
|
| 768 |
case OP_NOTQUERY:
|
| 769 |
case OP_NOTQUERYI:
|
| 770 |
case OP_NOTSTAR:
|
| 771 |
case OP_NOTSTARI:
|
| 772 |
case OP_NOTUPTO:
|
| 773 |
case OP_NOTUPTOI:
|
| 774 |
case OP_NOT_HSPACE:
|
| 775 |
case OP_NOT_VSPACE:
|
| 776 |
case OP_NOT_WORD_BOUNDARY:
|
| 777 |
case OP_NRREF:
|
| 778 |
case OP_PROP:
|
| 779 |
case OP_PRUNE:
|
| 780 |
case OP_PRUNE_ARG:
|
| 781 |
case OP_RECURSE:
|
| 782 |
case OP_REF:
|
| 783 |
case OP_REFI:
|
| 784 |
case OP_REVERSE:
|
| 785 |
case OP_RREF:
|
| 786 |
case OP_SCOND:
|
| 787 |
case OP_SET_SOM:
|
| 788 |
case OP_SKIP:
|
| 789 |
case OP_SKIP_ARG:
|
| 790 |
case OP_SOD:
|
| 791 |
case OP_SOM:
|
| 792 |
case OP_THEN:
|
| 793 |
case OP_THEN_ARG:
|
| 794 |
case OP_WORD_BOUNDARY:
|
| 795 |
case OP_XCLASS:
|
| 796 |
return SSB_FAIL;
|
| 797 |
|
| 798 |
/* If we hit a bracket or a positive lookahead assertion, recurse to set
|
| 799 |
bits from within the subpattern. If it can't find anything, we have to
|
| 800 |
give up. If it finds some mandatory character(s), we are done for this
|
| 801 |
branch. Otherwise, carry on scanning after the subpattern. */
|
| 802 |
|
| 803 |
case OP_BRA:
|
| 804 |
case OP_SBRA:
|
| 805 |
case OP_CBRA:
|
| 806 |
case OP_SCBRA:
|
| 807 |
case OP_BRAPOS:
|
| 808 |
case OP_SBRAPOS:
|
| 809 |
case OP_CBRAPOS:
|
| 810 |
case OP_SCBRAPOS:
|
| 811 |
case OP_ONCE:
|
| 812 |
case OP_ASSERT:
|
| 813 |
rc = set_start_bits(tcode, start_bits, utf8, cd);
|
| 814 |
if (rc == SSB_FAIL || rc == SSB_UNKNOWN) return rc;
|
| 815 |
if (rc == SSB_DONE) try_next = FALSE; else
|
| 816 |
{
|
| 817 |
do tcode += GET(tcode, 1); while (*tcode == OP_ALT);
|
| 818 |
tcode += 1 + LINK_SIZE;
|
| 819 |
}
|
| 820 |
break;
|
| 821 |
|
| 822 |
/* If we hit ALT or KET, it means we haven't found anything mandatory in
|
| 823 |
this branch, though we might have found something optional. For ALT, we
|
| 824 |
continue with the next alternative, but we have to arrange that the final
|
| 825 |
result from subpattern is SSB_CONTINUE rather than SSB_DONE. For KET,
|
| 826 |
return SSB_CONTINUE: if this is the top level, that indicates failure,
|
| 827 |
but after a nested subpattern, it causes scanning to continue. */
|
| 828 |
|
| 829 |
case OP_ALT:
|
| 830 |
yield = SSB_CONTINUE;
|
| 831 |
try_next = FALSE;
|
| 832 |
break;
|
| 833 |
|
| 834 |
case OP_KET:
|
| 835 |
case OP_KETRMAX:
|
| 836 |
case OP_KETRMIN:
|
| 837 |
case OP_KETRPOS:
|
| 838 |
return SSB_CONTINUE;
|
| 839 |
|
| 840 |
/* Skip over callout */
|
| 841 |
|
| 842 |
case OP_CALLOUT:
|
| 843 |
tcode += 2 + 2*LINK_SIZE;
|
| 844 |
break;
|
| 845 |
|
| 846 |
/* Skip over lookbehind and negative lookahead assertions */
|
| 847 |
|
| 848 |
case OP_ASSERT_NOT:
|
| 849 |
case OP_ASSERTBACK:
|
| 850 |
case OP_ASSERTBACK_NOT:
|
| 851 |
do tcode += GET(tcode, 1); while (*tcode == OP_ALT);
|
| 852 |
tcode += 1 + LINK_SIZE;
|
| 853 |
break;
|
| 854 |
|
| 855 |
/* BRAZERO does the bracket, but carries on. */
|
| 856 |
|
| 857 |
case OP_BRAZERO:
|
| 858 |
case OP_BRAMINZERO:
|
| 859 |
case OP_BRAPOSZERO:
|
| 860 |
rc = set_start_bits(++tcode, start_bits, utf8, cd);
|
| 861 |
if (rc == SSB_FAIL || rc == SSB_UNKNOWN) return rc;
|
| 862 |
/* =========================================================================
|
| 863 |
See the comment at the head of this function concerning the next line,
|
| 864 |
which was an old fudge for the benefit of OS/2.
|
| 865 |
dummy = 1;
|
| 866 |
========================================================================= */
|
| 867 |
do tcode += GET(tcode,1); while (*tcode == OP_ALT);
|
| 868 |
tcode += 1 + LINK_SIZE;
|
| 869 |
break;
|
| 870 |
|
| 871 |
/* SKIPZERO skips the bracket. */
|
| 872 |
|
| 873 |
case OP_SKIPZERO:
|
| 874 |
tcode++;
|
| 875 |
do tcode += GET(tcode,1); while (*tcode == OP_ALT);
|
| 876 |
tcode += 1 + LINK_SIZE;
|
| 877 |
break;
|
| 878 |
|
| 879 |
/* Single-char * or ? sets the bit and tries the next item */
|
| 880 |
|
| 881 |
case OP_STAR:
|
| 882 |
case OP_MINSTAR:
|
| 883 |
case OP_POSSTAR:
|
| 884 |
case OP_QUERY:
|
| 885 |
case OP_MINQUERY:
|
| 886 |
case OP_POSQUERY:
|
| 887 |
tcode = set_table_bit(start_bits, tcode + 1, FALSE, cd, utf8);
|
| 888 |
break;
|
| 889 |
|
| 890 |
case OP_STARI:
|
| 891 |
case OP_MINSTARI:
|
| 892 |
case OP_POSSTARI:
|
| 893 |
case OP_QUERYI:
|
| 894 |
case OP_MINQUERYI:
|
| 895 |
case OP_POSQUERYI:
|
| 896 |
tcode = set_table_bit(start_bits, tcode + 1, TRUE, cd, utf8);
|
| 897 |
break;
|
| 898 |
|
| 899 |
/* Single-char upto sets the bit and tries the next */
|
| 900 |
|
| 901 |
case OP_UPTO:
|
| 902 |
case OP_MINUPTO:
|
| 903 |
case OP_POSUPTO:
|
| 904 |
tcode = set_table_bit(start_bits, tcode + 3, FALSE, cd, utf8);
|
| 905 |
break;
|
| 906 |
|
| 907 |
case OP_UPTOI:
|
| 908 |
case OP_MINUPTOI:
|
| 909 |
case OP_POSUPTOI:
|
| 910 |
tcode = set_table_bit(start_bits, tcode + 3, TRUE, cd, utf8);
|
| 911 |
break;
|
| 912 |
|
| 913 |
/* At least one single char sets the bit and stops */
|
| 914 |
|
| 915 |
case OP_EXACT:
|
| 916 |
tcode += 2;
|
| 917 |
/* Fall through */
|
| 918 |
case OP_CHAR:
|
| 919 |
case OP_PLUS:
|
| 920 |
case OP_MINPLUS:
|
| 921 |
case OP_POSPLUS:
|
| 922 |
(void)set_table_bit(start_bits, tcode + 1, FALSE, cd, utf8);
|
| 923 |
try_next = FALSE;
|
| 924 |
break;
|
| 925 |
|
| 926 |
case OP_EXACTI:
|
| 927 |
tcode += 2;
|
| 928 |
/* Fall through */
|
| 929 |
case OP_CHARI:
|
| 930 |
case OP_PLUSI:
|
| 931 |
case OP_MINPLUSI:
|
| 932 |
case OP_POSPLUSI:
|
| 933 |
(void)set_table_bit(start_bits, tcode + 1, TRUE, cd, utf8);
|
| 934 |
try_next = FALSE;
|
| 935 |
break;
|
| 936 |
|
| 937 |
/* Special spacing and line-terminating items. These recognize specific
|
| 938 |
lists of characters. The difference between VSPACE and ANYNL is that the
|
| 939 |
latter can match the two-character CRLF sequence, but that is not
|
| 940 |
relevant for finding the first character, so their code here is
|
| 941 |
identical. */
|
| 942 |
|
| 943 |
case OP_HSPACE:
|
| 944 |
SET_BIT(0x09);
|
| 945 |
SET_BIT(0x20);
|
| 946 |
if (utf8)
|
| 947 |
{
|
| 948 |
SET_BIT(0xC2); /* For U+00A0 */
|
| 949 |
SET_BIT(0xE1); /* For U+1680, U+180E */
|
| 950 |
SET_BIT(0xE2); /* For U+2000 - U+200A, U+202F, U+205F */
|
| 951 |
SET_BIT(0xE3); /* For U+3000 */
|
| 952 |
}
|
| 953 |
else SET_BIT(0xA0);
|
| 954 |
try_next = FALSE;
|
| 955 |
break;
|
| 956 |
|
| 957 |
case OP_ANYNL:
|
| 958 |
case OP_VSPACE:
|
| 959 |
SET_BIT(0x0A);
|
| 960 |
SET_BIT(0x0B);
|
| 961 |
SET_BIT(0x0C);
|
| 962 |
SET_BIT(0x0D);
|
| 963 |
if (utf8)
|
| 964 |
{
|
| 965 |
SET_BIT(0xC2); /* For U+0085 */
|
| 966 |
SET_BIT(0xE2); /* For U+2028, U+2029 */
|
| 967 |
}
|
| 968 |
else SET_BIT(0x85);
|
| 969 |
try_next = FALSE;
|
| 970 |
break;
|
| 971 |
|
| 972 |
/* Single character types set the bits and stop. Note that if PCRE_UCP
|
| 973 |
is set, we do not see these op codes because \d etc are converted to
|
| 974 |
properties. Therefore, these apply in the case when only characters less
|
| 975 |
than 256 are recognized to match the types. */
|
| 976 |
|
| 977 |
case OP_NOT_DIGIT:
|
| 978 |
set_nottype_bits(start_bits, cbit_digit, table_limit, cd);
|
| 979 |
try_next = FALSE;
|
| 980 |
break;
|
| 981 |
|
| 982 |
case OP_DIGIT:
|
| 983 |
set_type_bits(start_bits, cbit_digit, table_limit, cd);
|
| 984 |
try_next = FALSE;
|
| 985 |
break;
|
| 986 |
|
| 987 |
/* The cbit_space table has vertical tab as whitespace; we have to
|
| 988 |
ensure it is set as not whitespace. */
|
| 989 |
|
| 990 |
case OP_NOT_WHITESPACE:
|
| 991 |
set_nottype_bits(start_bits, cbit_space, table_limit, cd);
|
| 992 |
start_bits[1] |= 0x08;
|
| 993 |
try_next = FALSE;
|
| 994 |
break;
|
| 995 |
|
| 996 |
/* The cbit_space table has vertical tab as whitespace; we have to
|
| 997 |
not set it from the table. */
|
| 998 |
|
| 999 |
case OP_WHITESPACE:
|
| 1000 |
c = start_bits[1]; /* Save in case it was already set */
|
| 1001 |
set_type_bits(start_bits, cbit_space, table_limit, cd);
|
| 1002 |
start_bits[1] = (start_bits[1] & ~0x08) | c;
|
| 1003 |
try_next = FALSE;
|
| 1004 |
break;
|
| 1005 |
|
| 1006 |
case OP_NOT_WORDCHAR:
|
| 1007 |
set_nottype_bits(start_bits, cbit_word, table_limit, cd);
|
| 1008 |
try_next = FALSE;
|
| 1009 |
break;
|
| 1010 |
|
| 1011 |
case OP_WORDCHAR:
|
| 1012 |
set_type_bits(start_bits, cbit_word, table_limit, cd);
|
| 1013 |
try_next = FALSE;
|
| 1014 |
break;
|
| 1015 |
|
| 1016 |
/* One or more character type fudges the pointer and restarts, knowing
|
| 1017 |
it will hit a single character type and stop there. */
|
| 1018 |
|
| 1019 |
case OP_TYPEPLUS:
|
| 1020 |
case OP_TYPEMINPLUS:
|
| 1021 |
case OP_TYPEPOSPLUS:
|
| 1022 |
tcode++;
|
| 1023 |
break;
|
| 1024 |
|
| 1025 |
case OP_TYPEEXACT:
|
| 1026 |
tcode += 3;
|
| 1027 |
break;
|
| 1028 |
|
| 1029 |
/* Zero or more repeats of character types set the bits and then
|
| 1030 |
try again. */
|
| 1031 |
|
| 1032 |
case OP_TYPEUPTO:
|
| 1033 |
case OP_TYPEMINUPTO:
|
| 1034 |
case OP_TYPEPOSUPTO:
|
| 1035 |
tcode += 2; /* Fall through */
|
| 1036 |
|
| 1037 |
case OP_TYPESTAR:
|
| 1038 |
case OP_TYPEMINSTAR:
|
| 1039 |
case OP_TYPEPOSSTAR:
|
| 1040 |
case OP_TYPEQUERY:
|
| 1041 |
case OP_TYPEMINQUERY:
|
| 1042 |
case OP_TYPEPOSQUERY:
|
| 1043 |
switch(tcode[1])
|
| 1044 |
{
|
| 1045 |
default:
|
| 1046 |
case OP_ANY:
|
| 1047 |
case OP_ALLANY:
|
| 1048 |
return SSB_FAIL;
|
| 1049 |
|
| 1050 |
case OP_HSPACE:
|
| 1051 |
SET_BIT(0x09);
|
| 1052 |
SET_BIT(0x20);
|
| 1053 |
if (utf8)
|
| 1054 |
{
|
| 1055 |
SET_BIT(0xC2); /* For U+00A0 */
|
| 1056 |
SET_BIT(0xE1); /* For U+1680, U+180E */
|
| 1057 |
SET_BIT(0xE2); /* For U+2000 - U+200A, U+202F, U+205F */
|
| 1058 |
SET_BIT(0xE3); /* For U+3000 */
|
| 1059 |
}
|
| 1060 |
else SET_BIT(0xA0);
|
| 1061 |
break;
|
| 1062 |
|
| 1063 |
case OP_ANYNL:
|
| 1064 |
case OP_VSPACE:
|
| 1065 |
SET_BIT(0x0A);
|
| 1066 |
SET_BIT(0x0B);
|
| 1067 |
SET_BIT(0x0C);
|
| 1068 |
SET_BIT(0x0D);
|
| 1069 |
if (utf8)
|
| 1070 |
{
|
| 1071 |
SET_BIT(0xC2); /* For U+0085 */
|
| 1072 |
SET_BIT(0xE2); /* For U+2028, U+2029 */
|
| 1073 |
}
|
| 1074 |
else SET_BIT(0x85);
|
| 1075 |
break;
|
| 1076 |
|
| 1077 |
case OP_NOT_DIGIT:
|
| 1078 |
set_nottype_bits(start_bits, cbit_digit, table_limit, cd);
|
| 1079 |
break;
|
| 1080 |
|
| 1081 |
case OP_DIGIT:
|
| 1082 |
set_type_bits(start_bits, cbit_digit, table_limit, cd);
|
| 1083 |
break;
|
| 1084 |
|
| 1085 |
/* The cbit_space table has vertical tab as whitespace; we have to
|
| 1086 |
ensure it gets set as not whitespace. */
|
| 1087 |
|
| 1088 |
case OP_NOT_WHITESPACE:
|
| 1089 |
set_nottype_bits(start_bits, cbit_space, table_limit, cd);
|
| 1090 |
start_bits[1] |= 0x08;
|
| 1091 |
break;
|
| 1092 |
|
| 1093 |
/* The cbit_space table has vertical tab as whitespace; we have to
|
| 1094 |
avoid setting it. */
|
| 1095 |
|
| 1096 |
case OP_WHITESPACE:
|
| 1097 |
c = start_bits[1]; /* Save in case it was already set */
|
| 1098 |
set_type_bits(start_bits, cbit_space, table_limit, cd);
|
| 1099 |
start_bits[1] = (start_bits[1] & ~0x08) | c;
|
| 1100 |
break;
|
| 1101 |
|
| 1102 |
case OP_NOT_WORDCHAR:
|
| 1103 |
set_nottype_bits(start_bits, cbit_word, table_limit, cd);
|
| 1104 |
break;
|
| 1105 |
|
| 1106 |
case OP_WORDCHAR:
|
| 1107 |
set_type_bits(start_bits, cbit_word, table_limit, cd);
|
| 1108 |
break;
|
| 1109 |
}
|
| 1110 |
|
| 1111 |
tcode += 2;
|
| 1112 |
break;
|
| 1113 |
|
| 1114 |
/* Character class where all the information is in a bit map: set the
|
| 1115 |
bits and either carry on or not, according to the repeat count. If it was
|
| 1116 |
a negative class, and we are operating with UTF-8 characters, any byte
|
| 1117 |
with a value >= 0xc4 is a potentially valid starter because it starts a
|
| 1118 |
character with a value > 255. */
|
| 1119 |
|
| 1120 |
case OP_NCLASS:
|
| 1121 |
#ifdef SUPPORT_UTF8
|
| 1122 |
if (utf8)
|
| 1123 |
{
|
| 1124 |
start_bits[24] |= 0xf0; /* Bits for 0xc4 - 0xc8 */
|
| 1125 |
memset(start_bits+25, 0xff, 7); /* Bits for 0xc9 - 0xff */
|
| 1126 |
}
|
| 1127 |
#endif
|
| 1128 |
/* Fall through */
|
| 1129 |
|
| 1130 |
case OP_CLASS:
|
| 1131 |
{
|
| 1132 |
tcode++;
|
| 1133 |
|
| 1134 |
/* In UTF-8 mode, the bits in a bit map correspond to character
|
| 1135 |
values, not to byte values. However, the bit map we are constructing is
|
| 1136 |
for byte values. So we have to do a conversion for characters whose
|
| 1137 |
value is > 127. In fact, there are only two possible starting bytes for
|
| 1138 |
characters in the range 128 - 255. */
|
| 1139 |
|
| 1140 |
#ifdef SUPPORT_UTF8
|
| 1141 |
if (utf8)
|
| 1142 |
{
|
| 1143 |
for (c = 0; c < 16; c++) start_bits[c] |= tcode[c];
|
| 1144 |
for (c = 128; c < 256; c++)
|
| 1145 |
{
|
| 1146 |
if ((tcode[c/8] && (1 << (c&7))) != 0)
|
| 1147 |
{
|
| 1148 |
int d = (c >> 6) | 0xc0; /* Set bit for this starter */
|
| 1149 |
start_bits[d/8] |= (1 << (d&7)); /* and then skip on to the */
|
| 1150 |
c = (c & 0xc0) + 0x40 - 1; /* next relevant character. */
|
| 1151 |
}
|
| 1152 |
}
|
| 1153 |
}
|
| 1154 |
|
| 1155 |
/* In non-UTF-8 mode, the two bit maps are completely compatible. */
|
| 1156 |
|
| 1157 |
else
|
| 1158 |
#endif
|
| 1159 |
{
|
| 1160 |
for (c = 0; c < 32; c++) start_bits[c] |= tcode[c];
|
| 1161 |
}
|
| 1162 |
|
| 1163 |
/* Advance past the bit map, and act on what follows. For a zero
|
| 1164 |
minimum repeat, continue; otherwise stop processing. */
|
| 1165 |
|
| 1166 |
tcode += 32;
|
| 1167 |
switch (*tcode)
|
| 1168 |
{
|
| 1169 |
case OP_CRSTAR:
|
| 1170 |
case OP_CRMINSTAR:
|
| 1171 |
case OP_CRQUERY:
|
| 1172 |
case OP_CRMINQUERY:
|
| 1173 |
tcode++;
|
| 1174 |
break;
|
| 1175 |
|
| 1176 |
case OP_CRRANGE:
|
| 1177 |
case OP_CRMINRANGE:
|
| 1178 |
if (((tcode[1] << 8) + tcode[2]) == 0) tcode += 5;
|
| 1179 |
else try_next = FALSE;
|
| 1180 |
break;
|
| 1181 |
|
| 1182 |
default:
|
| 1183 |
try_next = FALSE;
|
| 1184 |
break;
|
| 1185 |
}
|
| 1186 |
}
|
| 1187 |
break; /* End of bitmap class handling */
|
| 1188 |
|
| 1189 |
} /* End of switch */
|
| 1190 |
} /* End of try_next loop */
|
| 1191 |
|
| 1192 |
code += GET(code, 1); /* Advance to next branch */
|
| 1193 |
}
|
| 1194 |
while (*code == OP_ALT);
|
| 1195 |
return yield;
|
| 1196 |
}
|
| 1197 |
|
| 1198 |
|
| 1199 |
|
| 1200 |
|
| 1201 |
|
| 1202 |
/*************************************************
|
| 1203 |
* Study a compiled expression *
|
| 1204 |
*************************************************/
|
| 1205 |
|
| 1206 |
/* This function is handed a compiled expression that it must study to produce
|
| 1207 |
information that will speed up the matching. It returns a pcre_extra block
|
| 1208 |
which then gets handed back to pcre_exec().
|
| 1209 |
|
| 1210 |
Arguments:
|
| 1211 |
re points to the compiled expression
|
| 1212 |
options contains option bits
|
| 1213 |
errorptr points to where to place error messages;
|
| 1214 |
set NULL unless error
|
| 1215 |
|
| 1216 |
Returns: pointer to a pcre_extra block, with study_data filled in and the
|
| 1217 |
appropriate flags set;
|
| 1218 |
NULL on error or if no optimization possible
|
| 1219 |
*/
|
| 1220 |
|
| 1221 |
PCRE_EXP_DEFN pcre_extra * PCRE_CALL_CONVENTION
|
| 1222 |
pcre_study(const pcre *external_re, int options, const char **errorptr)
|
| 1223 |
{
|
| 1224 |
int min;
|
| 1225 |
BOOL bits_set = FALSE;
|
| 1226 |
BOOL had_accept = FALSE;
|
| 1227 |
uschar start_bits[32];
|
| 1228 |
pcre_extra *extra;
|
| 1229 |
pcre_study_data *study;
|
| 1230 |
const uschar *tables;
|
| 1231 |
uschar *code;
|
| 1232 |
compile_data compile_block;
|
| 1233 |
const real_pcre *re = (const real_pcre *)external_re;
|
| 1234 |
|
| 1235 |
*errorptr = NULL;
|
| 1236 |
|
| 1237 |
if (re == NULL || re->magic_number != MAGIC_NUMBER)
|
| 1238 |
{
|
| 1239 |
*errorptr = "argument is not a compiled regular expression";
|
| 1240 |
return NULL;
|
| 1241 |
}
|
| 1242 |
|
| 1243 |
if ((options & ~PUBLIC_STUDY_OPTIONS) != 0)
|
| 1244 |
{
|
| 1245 |
*errorptr = "unknown or incorrect option bit(s) set";
|
| 1246 |
return NULL;
|
| 1247 |
}
|
| 1248 |
|
| 1249 |
code = (uschar *)re + re->name_table_offset +
|
| 1250 |
(re->name_count * re->name_entry_size);
|
| 1251 |
|
| 1252 |
/* For an anchored pattern, or an unanchored pattern that has a first char, or
|
| 1253 |
a multiline pattern that matches only at "line starts", there is no point in
|
| 1254 |
seeking a list of starting bytes. */
|
| 1255 |
|
| 1256 |
if ((re->options & PCRE_ANCHORED) == 0 &&
|
| 1257 |
(re->flags & (PCRE_FIRSTSET|PCRE_STARTLINE)) == 0)
|
| 1258 |
{
|
| 1259 |
int rc;
|
| 1260 |
|
| 1261 |
/* Set the character tables in the block that is passed around */
|
| 1262 |
|
| 1263 |
tables = re->tables;
|
| 1264 |
if (tables == NULL)
|
| 1265 |
(void)pcre_fullinfo(external_re, NULL, PCRE_INFO_DEFAULT_TABLES,
|
| 1266 |
(void *)(&tables));
|
| 1267 |
|
| 1268 |
compile_block.lcc = tables + lcc_offset;
|
| 1269 |
compile_block.fcc = tables + fcc_offset;
|
| 1270 |
compile_block.cbits = tables + cbits_offset;
|
| 1271 |
compile_block.ctypes = tables + ctypes_offset;
|
| 1272 |
|
| 1273 |
/* See if we can find a fixed set of initial characters for the pattern. */
|
| 1274 |
|
| 1275 |
memset(start_bits, 0, 32 * sizeof(uschar));
|
| 1276 |
rc = set_start_bits(code, start_bits, (re->options & PCRE_UTF8) != 0,
|
| 1277 |
&compile_block);
|
| 1278 |
bits_set = rc == SSB_DONE;
|
| 1279 |
if (rc == SSB_UNKNOWN) *errorptr = "internal error: opcode not recognized";
|
| 1280 |
}
|
| 1281 |
|
| 1282 |
/* Find the minimum length of subject string. */
|
| 1283 |
|
| 1284 |
switch(min = find_minlength(code, code, re->options, &had_accept, 0))
|
| 1285 |
{
|
| 1286 |
case -2: *errorptr = "internal error: missing capturing bracket"; break;
|
| 1287 |
case -3: *errorptr = "internal error: opcode not recognized"; break;
|
| 1288 |
default: break;
|
| 1289 |
}
|
| 1290 |
|
| 1291 |
/* Return NULL if there's been an error or if no optimization is possible. */
|
| 1292 |
|
| 1293 |
if (*errorptr != NULL || (!bits_set && min < 0)) return NULL;
|
| 1294 |
|
| 1295 |
/* Get a pcre_extra block and a pcre_study_data block. The study data is put in
|
| 1296 |
the latter, which is pointed to by the former, which may also get additional
|
| 1297 |
data set later by the calling program. At the moment, the size of
|
| 1298 |
pcre_study_data is fixed. We nevertheless save it in a field for returning via
|
| 1299 |
the pcre_fullinfo() function so that if it becomes variable in the future, we
|
| 1300 |
don't have to change that code. */
|
| 1301 |
|
| 1302 |
extra = (pcre_extra *)(pcre_malloc)
|
| 1303 |
(sizeof(pcre_extra) + sizeof(pcre_study_data));
|
| 1304 |
|
| 1305 |
if (extra == NULL)
|
| 1306 |
{
|
| 1307 |
*errorptr = "failed to get memory";
|
| 1308 |
return NULL;
|
| 1309 |
}
|
| 1310 |
|
| 1311 |
study = (pcre_study_data *)((char *)extra + sizeof(pcre_extra));
|
| 1312 |
extra->flags = PCRE_EXTRA_STUDY_DATA;
|
| 1313 |
extra->study_data = study;
|
| 1314 |
|
| 1315 |
study->size = sizeof(pcre_study_data);
|
| 1316 |
study->flags = 0;
|
| 1317 |
|
| 1318 |
if (bits_set)
|
| 1319 |
{
|
| 1320 |
study->flags |= PCRE_STUDY_MAPPED;
|
| 1321 |
memcpy(study->start_bits, start_bits, sizeof(start_bits));
|
| 1322 |
}
|
| 1323 |
|
| 1324 |
if (min >= 0)
|
| 1325 |
{
|
| 1326 |
study->flags |= PCRE_STUDY_MINLEN;
|
| 1327 |
study->minlength = min;
|
| 1328 |
}
|
| 1329 |
|
| 1330 |
return extra;
|
| 1331 |
}
|
| 1332 |
|
| 1333 |
/* End of pcre_study.c */
|
Parent Directory
| 
Revision Log