/[pcre]/code/trunk/pcre_study.c
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revision 111 by ph10, Thu Mar 8 16:53:09 2007 UTC revision 914 by zherczeg, Mon Feb 13 06:04:50 2012 UTC
# Line 6  Line 6 
6  and semantics are as close as possible to those of the Perl 5 language.  and semantics are as close as possible to those of the Perl 5 language.
7    
8                         Written by Philip Hazel                         Written by Philip Hazel
9             Copyright (c) 1997-2006 University of Cambridge             Copyright (c) 1997-2012 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 42  POSSIBILITY OF SUCH DAMAGE. Line 42  POSSIBILITY OF SUCH DAMAGE.
42  supporting functions. */  supporting functions. */
43    
44    
45    #ifdef HAVE_CONFIG_H
46    #include "config.h"
47    #endif
48    
49  #include "pcre_internal.h"  #include "pcre_internal.h"
50    
51    #define SET_BIT(c) start_bits[c/8] |= (1 << (c&7))
52    
53  /* Returns from set_start_bits() */  /* Returns from set_start_bits() */
54    
55  enum { SSB_FAIL, SSB_DONE, SSB_CONTINUE };  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      int             RECURSE depth
73    
74    Returns:   the minimum length
75               -1 if \C in UTF-8 mode or (*ACCEPT) was encountered
76               -2 internal error (missing capturing bracket)
77               -3 internal error (opcode not listed)
78    */
79    
80    static int
81    find_minlength(const pcre_uchar *code, const pcre_uchar *startcode, int options,
82      int recurse_depth)
83    {
84    int length = -1;
85    /* PCRE_UTF16 has the same value as PCRE_UTF8. */
86    BOOL utf = (options & PCRE_UTF8) != 0;
87    BOOL had_recurse = FALSE;
88    register int branchlength = 0;
89    register pcre_uchar *cc = (pcre_uchar *)code + 1 + LINK_SIZE;
90    
91    if (*code == OP_CBRA || *code == OP_SCBRA ||
92        *code == OP_CBRAPOS || *code == OP_SCBRAPOS) cc += IMM2_SIZE;
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      pcre_uchar *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        case OP_ONCE_NC:
132        d = find_minlength(cc, startcode, options, recurse_depth);
133        if (d < 0) return d;
134        branchlength += d;
135        do cc += GET(cc, 1); while (*cc == OP_ALT);
136        cc += 1 + LINK_SIZE;
137        break;
138    
139        /* ACCEPT makes things far too complicated; we have to give up. */
140    
141        case OP_ACCEPT:
142        case OP_ASSERT_ACCEPT:
143        return -1;
144    
145        /* Reached end of a branch; if it's a ket it is the end of a nested
146        call. If it's ALT it is an alternation in a nested call. If it is END it's
147        the end of the outer call. All can be handled by the same code. If an
148        ACCEPT was previously encountered, use the length that was in force at that
149        time, and pass back the shortest ACCEPT length. */
150    
151        case OP_ALT:
152        case OP_KET:
153        case OP_KETRMAX:
154        case OP_KETRMIN:
155        case OP_KETRPOS:
156        case OP_END:
157        if (length < 0 || (!had_recurse && branchlength < length))
158          length = branchlength;
159        if (op != OP_ALT) return length;
160        cc += 1 + LINK_SIZE;
161        branchlength = 0;
162        had_recurse = FALSE;
163        break;
164    
165        /* Skip over assertive subpatterns */
166    
167        case OP_ASSERT:
168        case OP_ASSERT_NOT:
169        case OP_ASSERTBACK:
170        case OP_ASSERTBACK_NOT:
171        do cc += GET(cc, 1); while (*cc == OP_ALT);
172        /* Fall through */
173    
174        /* Skip over things that don't match chars */
175    
176        case OP_REVERSE:
177        case OP_CREF:
178        case OP_NCREF:
179        case OP_RREF:
180        case OP_NRREF:
181        case OP_DEF:
182        case OP_CALLOUT:
183        case OP_SOD:
184        case OP_SOM:
185        case OP_EOD:
186        case OP_EODN:
187        case OP_CIRC:
188        case OP_CIRCM:
189        case OP_DOLL:
190        case OP_DOLLM:
191        case OP_NOT_WORD_BOUNDARY:
192        case OP_WORD_BOUNDARY:
193        cc += PRIV(OP_lengths)[*cc];
194        break;
195    
196        /* Skip over a subpattern that has a {0} or {0,x} quantifier */
197    
198        case OP_BRAZERO:
199        case OP_BRAMINZERO:
200        case OP_BRAPOSZERO:
201        case OP_SKIPZERO:
202        cc += PRIV(OP_lengths)[*cc];
203        do cc += GET(cc, 1); while (*cc == OP_ALT);
204        cc += 1 + LINK_SIZE;
205        break;
206    
207        /* Handle literal characters and + repetitions */
208    
209        case OP_CHAR:
210        case OP_CHARI:
211        case OP_NOT:
212        case OP_NOTI:
213        case OP_PLUS:
214        case OP_PLUSI:
215        case OP_MINPLUS:
216        case OP_MINPLUSI:
217        case OP_POSPLUS:
218        case OP_POSPLUSI:
219        case OP_NOTPLUS:
220        case OP_NOTPLUSI:
221        case OP_NOTMINPLUS:
222        case OP_NOTMINPLUSI:
223        case OP_NOTPOSPLUS:
224        case OP_NOTPOSPLUSI:
225        branchlength++;
226        cc += 2;
227    #ifdef SUPPORT_UTF
228        if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
229    #endif
230        break;
231    
232        case OP_TYPEPLUS:
233        case OP_TYPEMINPLUS:
234        case OP_TYPEPOSPLUS:
235        branchlength++;
236        cc += (cc[1] == OP_PROP || cc[1] == OP_NOTPROP)? 4 : 2;
237        break;
238    
239        /* Handle exact repetitions. The count is already in characters, but we
240        need to skip over a multibyte character in UTF8 mode.  */
241    
242        case OP_EXACT:
243        case OP_EXACTI:
244        case OP_NOTEXACT:
245        case OP_NOTEXACTI:
246        branchlength += GET2(cc,1);
247        cc += 2 + IMM2_SIZE;
248    #ifdef SUPPORT_UTF
249        if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
250    #endif
251        break;
252    
253        case OP_TYPEEXACT:
254        branchlength += GET2(cc,1);
255        cc += 2 + IMM2_SIZE + ((cc[1 + IMM2_SIZE] == OP_PROP
256          || cc[1 + IMM2_SIZE] == OP_NOTPROP)? 2 : 0);
257        break;
258    
259        /* Handle single-char non-literal matchers */
260    
261        case OP_PROP:
262        case OP_NOTPROP:
263        cc += 2;
264        /* Fall through */
265    
266        case OP_NOT_DIGIT:
267        case OP_DIGIT:
268        case OP_NOT_WHITESPACE:
269        case OP_WHITESPACE:
270        case OP_NOT_WORDCHAR:
271        case OP_WORDCHAR:
272        case OP_ANY:
273        case OP_ALLANY:
274        case OP_EXTUNI:
275        case OP_HSPACE:
276        case OP_NOT_HSPACE:
277        case OP_VSPACE:
278        case OP_NOT_VSPACE:
279        branchlength++;
280        cc++;
281        break;
282    
283        /* "Any newline" might match two characters, but it also might match just
284        one. */
285    
286        case OP_ANYNL:
287        branchlength += 1;
288        cc++;
289        break;
290    
291        /* The single-byte matcher means we can't proceed in UTF-8 mode. (In
292        non-UTF-8 mode \C will actually be turned into OP_ALLANY, so won't ever
293        appear, but leave the code, just in case.) */
294    
295        case OP_ANYBYTE:
296    #ifdef SUPPORT_UTF
297        if (utf) return -1;
298    #endif
299        branchlength++;
300        cc++;
301        break;
302    
303        /* For repeated character types, we have to test for \p and \P, which have
304        an extra two bytes of parameters. */
305    
306        case OP_TYPESTAR:
307        case OP_TYPEMINSTAR:
308        case OP_TYPEQUERY:
309        case OP_TYPEMINQUERY:
310        case OP_TYPEPOSSTAR:
311        case OP_TYPEPOSQUERY:
312        if (cc[1] == OP_PROP || cc[1] == OP_NOTPROP) cc += 2;
313        cc += PRIV(OP_lengths)[op];
314        break;
315    
316        case OP_TYPEUPTO:
317        case OP_TYPEMINUPTO:
318        case OP_TYPEPOSUPTO:
319        if (cc[1 + IMM2_SIZE] == OP_PROP
320          || cc[1 + IMM2_SIZE] == OP_NOTPROP) cc += 2;
321        cc += PRIV(OP_lengths)[op];
322        break;
323    
324        /* Check a class for variable quantification */
325    
326    #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
327        case OP_XCLASS:
328        cc += GET(cc, 1) - PRIV(OP_lengths)[OP_CLASS];
329        /* Fall through */
330    #endif
331    
332        case OP_CLASS:
333        case OP_NCLASS:
334        cc += PRIV(OP_lengths)[OP_CLASS];
335    
336        switch (*cc)
337          {
338          case OP_CRPLUS:
339          case OP_CRMINPLUS:
340          branchlength++;
341          /* Fall through */
342    
343          case OP_CRSTAR:
344          case OP_CRMINSTAR:
345          case OP_CRQUERY:
346          case OP_CRMINQUERY:
347          cc++;
348          break;
349    
350          case OP_CRRANGE:
351          case OP_CRMINRANGE:
352          branchlength += GET2(cc,1);
353          cc += 1 + 2 * IMM2_SIZE;
354          break;
355    
356          default:
357          branchlength++;
358          break;
359          }
360        break;
361    
362        /* Backreferences and subroutine calls are treated in the same way: we find
363        the minimum length for the subpattern. A recursion, however, causes an
364        a flag to be set that causes the length of this branch to be ignored. The
365        logic is that a recursion can only make sense if there is another
366        alternation that stops the recursing. That will provide the minimum length
367        (when no recursion happens). A backreference within the group that it is
368        referencing behaves in the same way.
369    
370        If PCRE_JAVASCRIPT_COMPAT is set, a backreference to an unset bracket
371        matches an empty string (by default it causes a matching failure), so in
372        that case we must set the minimum length to zero. */
373    
374        case OP_REF:
375        case OP_REFI:
376        if ((options & PCRE_JAVASCRIPT_COMPAT) == 0)
377          {
378          ce = cs = (pcre_uchar *)PRIV(find_bracket)(startcode, utf, GET2(cc, 1));
379          if (cs == NULL) return -2;
380          do ce += GET(ce, 1); while (*ce == OP_ALT);
381          if (cc > cs && cc < ce)
382            {
383            d = 0;
384            had_recurse = TRUE;
385            }
386          else
387            {
388            d = find_minlength(cs, startcode, options, recurse_depth);
389            }
390          }
391        else d = 0;
392        cc += 1 + IMM2_SIZE;
393    
394        /* Handle repeated back references */
395    
396        switch (*cc)
397          {
398          case OP_CRSTAR:
399          case OP_CRMINSTAR:
400          case OP_CRQUERY:
401          case OP_CRMINQUERY:
402          min = 0;
403          cc++;
404          break;
405    
406          case OP_CRPLUS:
407          case OP_CRMINPLUS:
408          min = 1;
409          cc++;
410          break;
411    
412          case OP_CRRANGE:
413          case OP_CRMINRANGE:
414          min = GET2(cc, 1);
415          cc += 1 + 2 * IMM2_SIZE;
416          break;
417    
418          default:
419          min = 1;
420          break;
421          }
422    
423        branchlength += min * d;
424        break;
425    
426        /* We can easily detect direct recursion, but not mutual recursion. This is
427        caught by a recursion depth count. */
428    
429        case OP_RECURSE:
430        cs = ce = (pcre_uchar *)startcode + GET(cc, 1);
431        do ce += GET(ce, 1); while (*ce == OP_ALT);
432        if ((cc > cs && cc < ce) || recurse_depth > 10)
433          had_recurse = TRUE;
434        else
435          {
436          branchlength += find_minlength(cs, startcode, options, recurse_depth + 1);
437          }
438        cc += 1 + LINK_SIZE;
439        break;
440    
441        /* Anything else does not or need not match a character. We can get the
442        item's length from the table, but for those that can match zero occurrences
443        of a character, we must take special action for UTF-8 characters. As it
444        happens, the "NOT" versions of these opcodes are used at present only for
445        ASCII characters, so they could be omitted from this list. However, in
446        future that may change, so we include them here so as not to leave a
447        gotcha for a future maintainer. */
448    
449        case OP_UPTO:
450        case OP_UPTOI:
451        case OP_NOTUPTO:
452        case OP_NOTUPTOI:
453        case OP_MINUPTO:
454        case OP_MINUPTOI:
455        case OP_NOTMINUPTO:
456        case OP_NOTMINUPTOI:
457        case OP_POSUPTO:
458        case OP_POSUPTOI:
459        case OP_NOTPOSUPTO:
460        case OP_NOTPOSUPTOI:
461    
462        case OP_STAR:
463        case OP_STARI:
464        case OP_NOTSTAR:
465        case OP_NOTSTARI:
466        case OP_MINSTAR:
467        case OP_MINSTARI:
468        case OP_NOTMINSTAR:
469        case OP_NOTMINSTARI:
470        case OP_POSSTAR:
471        case OP_POSSTARI:
472        case OP_NOTPOSSTAR:
473        case OP_NOTPOSSTARI:
474    
475        case OP_QUERY:
476        case OP_QUERYI:
477        case OP_NOTQUERY:
478        case OP_NOTQUERYI:
479        case OP_MINQUERY:
480        case OP_MINQUERYI:
481        case OP_NOTMINQUERY:
482        case OP_NOTMINQUERYI:
483        case OP_POSQUERY:
484        case OP_POSQUERYI:
485        case OP_NOTPOSQUERY:
486        case OP_NOTPOSQUERYI:
487    
488        cc += PRIV(OP_lengths)[op];
489    #ifdef SUPPORT_UTF
490        if (utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
491    #endif
492        break;
493    
494        /* Skip these, but we need to add in the name length. */
495    
496        case OP_MARK:
497        case OP_PRUNE_ARG:
498        case OP_SKIP_ARG:
499        case OP_THEN_ARG:
500        cc += PRIV(OP_lengths)[op] + cc[1];
501        break;
502    
503        /* The remaining opcodes are just skipped over. */
504    
505        case OP_CLOSE:
506        case OP_COMMIT:
507        case OP_FAIL:
508        case OP_PRUNE:
509        case OP_SET_SOM:
510        case OP_SKIP:
511        case OP_THEN:
512        cc += PRIV(OP_lengths)[op];
513        break;
514    
515        /* This should not occur: we list all opcodes explicitly so that when
516        new ones get added they are properly considered. */
517    
518        default:
519        return -3;
520        }
521      }
522    /* Control never gets here */
523    }
524    
525    
526    
527  /*************************************************  /*************************************************
528  *      Set a bit and maybe its alternate case    *  *      Set a bit and maybe its alternate case    *
529  *************************************************/  *************************************************/
530    
531  /* Given a character, set its bit in the table, and also the bit for the other  /* Given a character, set its first byte's bit in the table, and also the
532  version of a letter if we are caseless.  corresponding bit for the other version of a letter if we are caseless. In
533    UTF-8 mode, for characters greater than 127, we can only do the caseless thing
534    when Unicode property support is available.
535    
536  Arguments:  Arguments:
537    start_bits    points to the bit map    start_bits    points to the bit map
538    c             is the character    p             points to the character
539    caseless      the caseless flag    caseless      the caseless flag
540    cd            the block with char table pointers    cd            the block with char table pointers
541      utf           TRUE for UTF-8 / UTF-16 mode
542    
543  Returns:        nothing  Returns:        pointer after the character
544    */
545    
546    static const pcre_uchar *
547    set_table_bit(pcre_uint8 *start_bits, const pcre_uchar *p, BOOL caseless,
548      compile_data *cd, BOOL utf)
549    {
550    unsigned int c = *p;
551    
552    #ifdef COMPILE_PCRE8
553    SET_BIT(c);
554    
555    #ifdef SUPPORT_UTF
556    if (utf && c > 127)
557      {
558      GETCHARINC(c, p);
559    #ifdef SUPPORT_UCP
560      if (caseless)
561        {
562        pcre_uchar buff[6];
563        c = UCD_OTHERCASE(c);
564        (void)PRIV(ord2utf)(c, buff);
565        SET_BIT(buff[0]);
566        }
567    #endif
568      return p;
569      }
570    #endif
571    
572    /* Not UTF-8 mode, or character is less than 127. */
573    
574    if (caseless && (cd->ctypes[c] & ctype_letter) != 0) SET_BIT(cd->fcc[c]);
575    return p + 1;
576    #endif
577    
578    #ifdef COMPILE_PCRE16
579    if (c > 0xff)
580      {
581      c = 0xff;
582      caseless = FALSE;
583      }
584    SET_BIT(c);
585    
586    #ifdef SUPPORT_UTF
587    if (utf && c > 127)
588      {
589      GETCHARINC(c, p);
590    #ifdef SUPPORT_UCP
591      if (caseless)
592        {
593        c = UCD_OTHERCASE(c);
594        if (c > 0xff)
595          c = 0xff;
596        SET_BIT(c);
597        }
598    #endif
599      return p;
600      }
601    #endif
602    
603    if (caseless && (cd->ctypes[c] & ctype_letter) != 0) SET_BIT(cd->fcc[c]);
604    return p + 1;
605    #endif
606    }
607    
608    
609    
610    /*************************************************
611    *     Set bits for a positive character type     *
612    *************************************************/
613    
614    /* This function sets starting bits for a character type. In UTF-8 mode, we can
615    only do a direct setting for bytes less than 128, as otherwise there can be
616    confusion with bytes in the middle of UTF-8 characters. In a "traditional"
617    environment, the tables will only recognize ASCII characters anyway, but in at
618    least one Windows environment, some higher bytes bits were set in the tables.
619    So we deal with that case by considering the UTF-8 encoding.
620    
621    Arguments:
622      start_bits     the starting bitmap
623      cbit type      the type of character wanted
624      table_limit    32 for non-UTF-8; 16 for UTF-8
625      cd             the block with char table pointers
626    
627    Returns:         nothing
628  */  */
629    
630  static void  static void
631  set_bit(uschar *start_bits, unsigned int c, BOOL caseless, compile_data *cd)  set_type_bits(pcre_uint8 *start_bits, int cbit_type, int table_limit,
632      compile_data *cd)
633  {  {
634  start_bits[c/8] |= (1 << (c&7));  register int c;
635  if (caseless && (cd->ctypes[c] & ctype_letter) != 0)  for (c = 0; c < table_limit; c++) start_bits[c] |= cd->cbits[c+cbit_type];
636    start_bits[cd->fcc[c]/8] |= (1 << (cd->fcc[c]&7));  #if defined SUPPORT_UTF && defined COMPILE_PCRE8
637    if (table_limit == 32) return;
638    for (c = 128; c < 256; c++)
639      {
640      if ((cd->cbits[c/8] & (1 << (c&7))) != 0)
641        {
642        pcre_uchar buff[6];
643        (void)PRIV(ord2utf)(c, buff);
644        SET_BIT(buff[0]);
645        }
646      }
647    #endif
648    }
649    
650    
651    /*************************************************
652    *     Set bits for a negative character type     *
653    *************************************************/
654    
655    /* This function sets starting bits for a negative character type such as \D.
656    In UTF-8 mode, we can only do a direct setting for bytes less than 128, as
657    otherwise there can be confusion with bytes in the middle of UTF-8 characters.
658    Unlike in the positive case, where we can set appropriate starting bits for
659    specific high-valued UTF-8 characters, in this case we have to set the bits for
660    all high-valued characters. The lowest is 0xc2, but we overkill by starting at
661    0xc0 (192) for simplicity.
662    
663    Arguments:
664      start_bits     the starting bitmap
665      cbit type      the type of character wanted
666      table_limit    32 for non-UTF-8; 16 for UTF-8
667      cd             the block with char table pointers
668    
669    Returns:         nothing
670    */
671    
672    static void
673    set_nottype_bits(pcre_uint8 *start_bits, int cbit_type, int table_limit,
674      compile_data *cd)
675    {
676    register int c;
677    for (c = 0; c < table_limit; c++) start_bits[c] |= ~cd->cbits[c+cbit_type];
678    #if defined SUPPORT_UTF && defined COMPILE_PCRE8
679    if (table_limit != 32) for (c = 24; c < 32; c++) start_bits[c] = 0xff;
680    #endif
681  }  }
682    
683    
# Line 91  function fails unless the result is SSB_ Line 697  function fails unless the result is SSB_
697  Arguments:  Arguments:
698    code         points to an expression    code         points to an expression
699    start_bits   points to a 32-byte table, initialized to 0    start_bits   points to a 32-byte table, initialized to 0
700    caseless     the current state of the caseless flag    utf          TRUE if in UTF-8 / UTF-16 mode
   utf8         TRUE if in UTF-8 mode  
701    cd           the block with char table pointers    cd           the block with char table pointers
702    
703  Returns:       SSB_FAIL     => Failed to find any starting bytes  Returns:       SSB_FAIL     => Failed to find any starting bytes
704                 SSB_DONE     => Found mandatory starting bytes                 SSB_DONE     => Found mandatory starting bytes
705                 SSB_CONTINUE => Found optional starting bytes                 SSB_CONTINUE => Found optional starting bytes
706                   SSB_UNKNOWN  => Hit an unrecognized opcode
707  */  */
708    
709  static int  static int
710  set_start_bits(const uschar *code, uschar *start_bits, BOOL caseless,  set_start_bits(const pcre_uchar *code, pcre_uint8 *start_bits, BOOL utf,
711    BOOL utf8, compile_data *cd)    compile_data *cd)
712  {  {
713  register int c;  register int c;
714  int yield = SSB_DONE;  int yield = SSB_DONE;
715    #if defined SUPPORT_UTF && defined COMPILE_PCRE8
716    int table_limit = utf? 16:32;
717    #else
718    int table_limit = 32;
719    #endif
720    
721  #if 0  #if 0
722  /* ========================================================================= */  /* ========================================================================= */
# Line 126  volatile int dummy; Line 737  volatile int dummy;
737    
738  do  do
739    {    {
   const uschar *tcode = code + (((int)*code == OP_CBRA)? 3:1) + LINK_SIZE;  
740    BOOL try_next = TRUE;    BOOL try_next = TRUE;
741      const pcre_uchar *tcode = code + 1 + LINK_SIZE;
742    
743      if (*code == OP_CBRA || *code == OP_SCBRA ||
744          *code == OP_CBRAPOS || *code == OP_SCBRAPOS) tcode += IMM2_SIZE;
745    
746    while (try_next)    /* Loop for items in this branch */    while (try_next)    /* Loop for items in this branch */
747      {      {
748      int rc;      int rc;
749    
750      switch(*tcode)      switch(*tcode)
751        {        {
752        /* Fail if we reach something we don't understand */        /* If we reach something we don't understand, it means a new opcode has
753          been created that hasn't been added to this code. Hopefully this problem
754          will be discovered during testing. */
755    
756        default:        default:
757          return SSB_UNKNOWN;
758    
759          /* Fail for a valid opcode that implies no starting bits. */
760    
761          case OP_ACCEPT:
762          case OP_ASSERT_ACCEPT:
763          case OP_ALLANY:
764          case OP_ANY:
765          case OP_ANYBYTE:
766          case OP_CIRC:
767          case OP_CIRCM:
768          case OP_CLOSE:
769          case OP_COMMIT:
770          case OP_COND:
771          case OP_CREF:
772          case OP_DEF:
773          case OP_DOLL:
774          case OP_DOLLM:
775          case OP_END:
776          case OP_EOD:
777          case OP_EODN:
778          case OP_EXTUNI:
779          case OP_FAIL:
780          case OP_MARK:
781          case OP_NCREF:
782          case OP_NOT:
783          case OP_NOTEXACT:
784          case OP_NOTEXACTI:
785          case OP_NOTI:
786          case OP_NOTMINPLUS:
787          case OP_NOTMINPLUSI:
788          case OP_NOTMINQUERY:
789          case OP_NOTMINQUERYI:
790          case OP_NOTMINSTAR:
791          case OP_NOTMINSTARI:
792          case OP_NOTMINUPTO:
793          case OP_NOTMINUPTOI:
794          case OP_NOTPLUS:
795          case OP_NOTPLUSI:
796          case OP_NOTPOSPLUS:
797          case OP_NOTPOSPLUSI:
798          case OP_NOTPOSQUERY:
799          case OP_NOTPOSQUERYI:
800          case OP_NOTPOSSTAR:
801          case OP_NOTPOSSTARI:
802          case OP_NOTPOSUPTO:
803          case OP_NOTPOSUPTOI:
804          case OP_NOTPROP:
805          case OP_NOTQUERY:
806          case OP_NOTQUERYI:
807          case OP_NOTSTAR:
808          case OP_NOTSTARI:
809          case OP_NOTUPTO:
810          case OP_NOTUPTOI:
811          case OP_NOT_HSPACE:
812          case OP_NOT_VSPACE:
813          case OP_NRREF:
814          case OP_PROP:
815          case OP_PRUNE:
816          case OP_PRUNE_ARG:
817          case OP_RECURSE:
818          case OP_REF:
819          case OP_REFI:
820          case OP_REVERSE:
821          case OP_RREF:
822          case OP_SCOND:
823          case OP_SET_SOM:
824          case OP_SKIP:
825          case OP_SKIP_ARG:
826          case OP_SOD:
827          case OP_SOM:
828          case OP_THEN:
829          case OP_THEN_ARG:
830    #if defined SUPPORT_UTF || !defined COMPILE_PCRE8
831          case OP_XCLASS:
832    #endif
833        return SSB_FAIL;        return SSB_FAIL;
834    
835          /* We can ignore word boundary tests. */
836    
837          case OP_WORD_BOUNDARY:
838          case OP_NOT_WORD_BOUNDARY:
839          tcode++;
840          break;
841    
842        /* If we hit a bracket or a positive lookahead assertion, recurse to set        /* If we hit a bracket or a positive lookahead assertion, recurse to set
843        bits from within the subpattern. If it can't find anything, we have to        bits from within the subpattern. If it can't find anything, we have to
844        give up. If it finds some mandatory character(s), we are done for this        give up. If it finds some mandatory character(s), we are done for this
# Line 148  do Line 848  do
848        case OP_SBRA:        case OP_SBRA:
849        case OP_CBRA:        case OP_CBRA:
850        case OP_SCBRA:        case OP_SCBRA:
851          case OP_BRAPOS:
852          case OP_SBRAPOS:
853          case OP_CBRAPOS:
854          case OP_SCBRAPOS:
855        case OP_ONCE:        case OP_ONCE:
856          case OP_ONCE_NC:
857        case OP_ASSERT:        case OP_ASSERT:
858        rc = set_start_bits(tcode, start_bits, caseless, utf8, cd);        rc = set_start_bits(tcode, start_bits, utf, cd);
859        if (rc == SSB_FAIL) return SSB_FAIL;        if (rc == SSB_FAIL || rc == SSB_UNKNOWN) return rc;
860        if (rc == SSB_DONE) try_next = FALSE; else        if (rc == SSB_DONE) try_next = FALSE; else
861          {          {
862          do tcode += GET(tcode, 1); while (*tcode == OP_ALT);          do tcode += GET(tcode, 1); while (*tcode == OP_ALT);
# Line 174  do Line 879  do
879        case OP_KET:        case OP_KET:
880        case OP_KETRMAX:        case OP_KETRMAX:
881        case OP_KETRMIN:        case OP_KETRMIN:
882          case OP_KETRPOS:
883        return SSB_CONTINUE;        return SSB_CONTINUE;
884    
885        /* Skip over callout */        /* Skip over callout */
# Line 191  do Line 897  do
897        tcode += 1 + LINK_SIZE;        tcode += 1 + LINK_SIZE;
898        break;        break;
899    
       /* Skip over an option setting, changing the caseless flag */  
   
       case OP_OPT:  
       caseless = (tcode[1] & PCRE_CASELESS) != 0;  
       tcode += 2;  
       break;  
   
900        /* BRAZERO does the bracket, but carries on. */        /* BRAZERO does the bracket, but carries on. */
901    
902        case OP_BRAZERO:        case OP_BRAZERO:
903        case OP_BRAMINZERO:        case OP_BRAMINZERO:
904        if (set_start_bits(++tcode, start_bits, caseless, utf8, cd) == SSB_FAIL)        case OP_BRAPOSZERO:
905          return SSB_FAIL;        rc = set_start_bits(++tcode, start_bits, utf, cd);
906          if (rc == SSB_FAIL || rc == SSB_UNKNOWN) return rc;
907  /* =========================================================================  /* =========================================================================
908        See the comment at the head of this function concerning the next line,        See the comment at the head of this function concerning the next line,
909        which was an old fudge for the benefit of OS/2.        which was an old fudge for the benefit of OS/2.
# Line 213  do Line 913  do
913        tcode += 1 + LINK_SIZE;        tcode += 1 + LINK_SIZE;
914        break;        break;
915    
916          /* SKIPZERO skips the bracket. */
917    
918          case OP_SKIPZERO:
919          tcode++;
920          do tcode += GET(tcode,1); while (*tcode == OP_ALT);
921          tcode += 1 + LINK_SIZE;
922          break;
923    
924        /* Single-char * or ? sets the bit and tries the next item */        /* Single-char * or ? sets the bit and tries the next item */
925    
926        case OP_STAR:        case OP_STAR:
# Line 221  do Line 929  do
929        case OP_QUERY:        case OP_QUERY:
930        case OP_MINQUERY:        case OP_MINQUERY:
931        case OP_POSQUERY:        case OP_POSQUERY:
932        set_bit(start_bits, tcode[1], caseless, cd);        tcode = set_table_bit(start_bits, tcode + 1, FALSE, cd, utf);
933        tcode += 2;        break;
934  #ifdef SUPPORT_UTF8  
935        if (utf8 && tcode[-1] >= 0xc0)        case OP_STARI:
936          tcode += _pcre_utf8_table4[tcode[-1] & 0x3f];        case OP_MINSTARI:
937  #endif        case OP_POSSTARI:
938          case OP_QUERYI:
939          case OP_MINQUERYI:
940          case OP_POSQUERYI:
941          tcode = set_table_bit(start_bits, tcode + 1, TRUE, cd, utf);
942        break;        break;
943    
944        /* Single-char upto sets the bit and tries the next */        /* Single-char upto sets the bit and tries the next */
# Line 234  do Line 946  do
946        case OP_UPTO:        case OP_UPTO:
947        case OP_MINUPTO:        case OP_MINUPTO:
948        case OP_POSUPTO:        case OP_POSUPTO:
949        set_bit(start_bits, tcode[3], caseless, cd);        tcode = set_table_bit(start_bits, tcode + 1 + IMM2_SIZE, FALSE, cd, utf);
       tcode += 4;  
 #ifdef SUPPORT_UTF8  
       if (utf8 && tcode[-1] >= 0xc0)  
         tcode += _pcre_utf8_table4[tcode[-1] & 0x3f];  
 #endif  
950        break;        break;
951    
952        /* At least one single char sets the bit and stops */        case OP_UPTOI:
953          case OP_MINUPTOI:
954          case OP_POSUPTOI:
955          tcode = set_table_bit(start_bits, tcode + 1 + IMM2_SIZE, TRUE, cd, utf);
956          break;
957    
958        case OP_EXACT:       /* Fall through */        /* At least one single char sets the bit and stops */
       tcode += 2;  
959    
960          case OP_EXACT:
961          tcode += IMM2_SIZE;
962          /* Fall through */
963        case OP_CHAR:        case OP_CHAR:
       case OP_CHARNC:  
964        case OP_PLUS:        case OP_PLUS:
965        case OP_MINPLUS:        case OP_MINPLUS:
966        case OP_POSPLUS:        case OP_POSPLUS:
967        set_bit(start_bits, tcode[1], caseless, cd);        (void)set_table_bit(start_bits, tcode + 1, FALSE, cd, utf);
968        try_next = FALSE;        try_next = FALSE;
969        break;        break;
970    
971        /* Single character type sets the bits and stops */        case OP_EXACTI:
972          tcode += IMM2_SIZE;
973          /* Fall through */
974          case OP_CHARI:
975          case OP_PLUSI:
976          case OP_MINPLUSI:
977          case OP_POSPLUSI:
978          (void)set_table_bit(start_bits, tcode + 1, TRUE, cd, utf);
979          try_next = FALSE;
980          break;
981    
982          /* Special spacing and line-terminating items. These recognize specific
983          lists of characters. The difference between VSPACE and ANYNL is that the
984          latter can match the two-character CRLF sequence, but that is not
985          relevant for finding the first character, so their code here is
986          identical. */
987    
988          case OP_HSPACE:
989          SET_BIT(0x09);
990          SET_BIT(0x20);
991    #ifdef SUPPORT_UTF
992          if (utf)
993            {
994    #ifdef COMPILE_PCRE8
995            SET_BIT(0xC2);  /* For U+00A0 */
996            SET_BIT(0xE1);  /* For U+1680, U+180E */
997            SET_BIT(0xE2);  /* For U+2000 - U+200A, U+202F, U+205F */
998            SET_BIT(0xE3);  /* For U+3000 */
999    #endif
1000    #ifdef COMPILE_PCRE16
1001            SET_BIT(0xA0);
1002            SET_BIT(0xFF);  /* For characters > 255 */
1003    #endif
1004            }
1005          else
1006    #endif /* SUPPORT_UTF */
1007            {
1008            SET_BIT(0xA0);
1009    #ifdef COMPILE_PCRE16
1010            SET_BIT(0xFF);  /* For characters > 255 */
1011    #endif
1012            }
1013          try_next = FALSE;
1014          break;
1015    
1016          case OP_ANYNL:
1017          case OP_VSPACE:
1018          SET_BIT(0x0A);
1019          SET_BIT(0x0B);
1020          SET_BIT(0x0C);
1021          SET_BIT(0x0D);
1022    #ifdef SUPPORT_UTF
1023          if (utf)
1024            {
1025    #ifdef COMPILE_PCRE8
1026            SET_BIT(0xC2);  /* For U+0085 */
1027            SET_BIT(0xE2);  /* For U+2028, U+2029 */
1028    #endif
1029    #ifdef COMPILE_PCRE16
1030            SET_BIT(0x85);
1031            SET_BIT(0xFF);  /* For characters > 255 */
1032    #endif
1033            }
1034          else
1035    #endif /* SUPPORT_UTF */
1036            {
1037            SET_BIT(0x85);
1038    #ifdef COMPILE_PCRE16
1039            SET_BIT(0xFF);  /* For characters > 255 */
1040    #endif
1041            }
1042          try_next = FALSE;
1043          break;
1044    
1045          /* Single character types set the bits and stop. Note that if PCRE_UCP
1046          is set, we do not see these op codes because \d etc are converted to
1047          properties. Therefore, these apply in the case when only characters less
1048          than 256 are recognized to match the types. */
1049    
1050        case OP_NOT_DIGIT:        case OP_NOT_DIGIT:
1051        for (c = 0; c < 32; c++)        set_nottype_bits(start_bits, cbit_digit, table_limit, cd);
         start_bits[c] |= ~cd->cbits[c+cbit_digit];  
1052        try_next = FALSE;        try_next = FALSE;
1053        break;        break;
1054    
1055        case OP_DIGIT:        case OP_DIGIT:
1056        for (c = 0; c < 32; c++)        set_type_bits(start_bits, cbit_digit, table_limit, cd);
         start_bits[c] |= cd->cbits[c+cbit_digit];  
1057        try_next = FALSE;        try_next = FALSE;
1058        break;        break;
1059    
1060        /* The cbit_space table has vertical tab as whitespace; we have to        /* The cbit_space table has vertical tab as whitespace; we have to
1061        discard it. */        ensure it is set as not whitespace. */
1062    
1063        case OP_NOT_WHITESPACE:        case OP_NOT_WHITESPACE:
1064        for (c = 0; c < 32; c++)        set_nottype_bits(start_bits, cbit_space, table_limit, cd);
1065          {        start_bits[1] |= 0x08;
         int d = cd->cbits[c+cbit_space];  
         if (c == 1) d &= ~0x08;  
         start_bits[c] |= ~d;  
         }  
1066        try_next = FALSE;        try_next = FALSE;
1067        break;        break;
1068    
1069        /* The cbit_space table has vertical tab as whitespace; we have to        /* The cbit_space table has vertical tab as whitespace; we have to
1070        discard it. */        not set it from the table. */
1071    
1072        case OP_WHITESPACE:        case OP_WHITESPACE:
1073        for (c = 0; c < 32; c++)        c = start_bits[1];    /* Save in case it was already set */
1074          {        set_type_bits(start_bits, cbit_space, table_limit, cd);
1075          int d = cd->cbits[c+cbit_space];        start_bits[1] = (start_bits[1] & ~0x08) | c;
         if (c == 1) d &= ~0x08;  
         start_bits[c] |= d;  
         }  
1076        try_next = FALSE;        try_next = FALSE;
1077        break;        break;
1078    
1079        case OP_NOT_WORDCHAR:        case OP_NOT_WORDCHAR:
1080        for (c = 0; c < 32; c++)        set_nottype_bits(start_bits, cbit_word, table_limit, cd);
         start_bits[c] |= ~cd->cbits[c+cbit_word];  
1081        try_next = FALSE;        try_next = FALSE;
1082        break;        break;
1083    
1084        case OP_WORDCHAR:        case OP_WORDCHAR:
1085        for (c = 0; c < 32; c++)        set_type_bits(start_bits, cbit_word, table_limit, cd);
         start_bits[c] |= cd->cbits[c+cbit_word];  
1086        try_next = FALSE;        try_next = FALSE;
1087        break;        break;
1088    
# Line 313  do Line 1091  do
1091    
1092        case OP_TYPEPLUS:        case OP_TYPEPLUS:
1093        case OP_TYPEMINPLUS:        case OP_TYPEMINPLUS:
1094          case OP_TYPEPOSPLUS:
1095        tcode++;        tcode++;
1096        break;        break;
1097    
1098        case OP_TYPEEXACT:        case OP_TYPEEXACT:
1099        tcode += 3;        tcode += 1 + IMM2_SIZE;
1100        break;        break;
1101    
1102        /* Zero or more repeats of character types set the bits and then        /* Zero or more repeats of character types set the bits and then
# Line 326  do Line 1105  do
1105        case OP_TYPEUPTO:        case OP_TYPEUPTO:
1106        case OP_TYPEMINUPTO:        case OP_TYPEMINUPTO:
1107        case OP_TYPEPOSUPTO:        case OP_TYPEPOSUPTO:
1108        tcode += 2;               /* Fall through */        tcode += IMM2_SIZE;  /* Fall through */
1109    
1110        case OP_TYPESTAR:        case OP_TYPESTAR:
1111        case OP_TYPEMINSTAR:        case OP_TYPEMINSTAR:
# Line 336  do Line 1115  do
1115        case OP_TYPEPOSQUERY:        case OP_TYPEPOSQUERY:
1116        switch(tcode[1])        switch(tcode[1])
1117          {          {
1118            default:
1119          case OP_ANY:          case OP_ANY:
1120            case OP_ALLANY:
1121          return SSB_FAIL;          return SSB_FAIL;
1122    
1123            case OP_HSPACE:
1124            SET_BIT(0x09);
1125            SET_BIT(0x20);
1126    #ifdef COMPILE_PCRE8
1127            if (utf)
1128              {
1129    #ifdef COMPILE_PCRE8
1130              SET_BIT(0xC2);  /* For U+00A0 */
1131              SET_BIT(0xE1);  /* For U+1680, U+180E */
1132              SET_BIT(0xE2);  /* For U+2000 - U+200A, U+202F, U+205F */
1133              SET_BIT(0xE3);  /* For U+3000 */
1134    #endif
1135    #ifdef COMPILE_PCRE16
1136              SET_BIT(0xA0);
1137              SET_BIT(0xFF);  /* For characters > 255 */
1138    #endif
1139              }
1140            else
1141    #endif /* SUPPORT_UTF */
1142              SET_BIT(0xA0);
1143            break;
1144    
1145            case OP_ANYNL:
1146            case OP_VSPACE:
1147            SET_BIT(0x0A);
1148            SET_BIT(0x0B);
1149            SET_BIT(0x0C);
1150            SET_BIT(0x0D);
1151    #ifdef COMPILE_PCRE8
1152            if (utf)
1153              {
1154    #ifdef COMPILE_PCRE8
1155              SET_BIT(0xC2);  /* For U+0085 */
1156              SET_BIT(0xE2);  /* For U+2028, U+2029 */
1157    #endif
1158    #ifdef COMPILE_PCRE16
1159              SET_BIT(0x85);
1160              SET_BIT(0xFF);  /* For characters > 255 */
1161    #endif
1162              }
1163            else
1164    #endif /* SUPPORT_UTF */
1165              SET_BIT(0x85);
1166            break;
1167    
1168          case OP_NOT_DIGIT:          case OP_NOT_DIGIT:
1169          for (c = 0; c < 32; c++)          set_nottype_bits(start_bits, cbit_digit, table_limit, cd);
           start_bits[c] |= ~cd->cbits[c+cbit_digit];  
1170          break;          break;
1171    
1172          case OP_DIGIT:          case OP_DIGIT:
1173          for (c = 0; c < 32; c++)          set_type_bits(start_bits, cbit_digit, table_limit, cd);
           start_bits[c] |= cd->cbits[c+cbit_digit];  
1174          break;          break;
1175    
1176          /* The cbit_space table has vertical tab as whitespace; we have to          /* The cbit_space table has vertical tab as whitespace; we have to
1177          discard it. */          ensure it gets set as not whitespace. */
1178    
1179          case OP_NOT_WHITESPACE:          case OP_NOT_WHITESPACE:
1180          for (c = 0; c < 32; c++)          set_nottype_bits(start_bits, cbit_space, table_limit, cd);
1181            {          start_bits[1] |= 0x08;
           int d = cd->cbits[c+cbit_space];  
           if (c == 1) d &= ~0x08;  
           start_bits[c] |= ~d;  
           }  
1182          break;          break;
1183    
1184          /* The cbit_space table has vertical tab as whitespace; we have to          /* The cbit_space table has vertical tab as whitespace; we have to
1185          discard it. */          avoid setting it. */
1186    
1187          case OP_WHITESPACE:          case OP_WHITESPACE:
1188          for (c = 0; c < 32; c++)          c = start_bits[1];    /* Save in case it was already set */
1189            {          set_type_bits(start_bits, cbit_space, table_limit, cd);
1190            int d = cd->cbits[c+cbit_space];          start_bits[1] = (start_bits[1] & ~0x08) | c;
           if (c == 1) d &= ~0x08;  
           start_bits[c] |= d;  
           }  
1191          break;          break;
1192    
1193          case OP_NOT_WORDCHAR:          case OP_NOT_WORDCHAR:
1194          for (c = 0; c < 32; c++)          set_nottype_bits(start_bits, cbit_word, table_limit, cd);
           start_bits[c] |= ~cd->cbits[c+cbit_word];  
1195          break;          break;
1196    
1197          case OP_WORDCHAR:          case OP_WORDCHAR:
1198          for (c = 0; c < 32; c++)          set_type_bits(start_bits, cbit_word, table_limit, cd);
           start_bits[c] |= cd->cbits[c+cbit_word];  
1199          break;          break;
1200          }          }
1201    
# Line 394  do Line 1209  do
1209        character with a value > 255. */        character with a value > 255. */
1210    
1211        case OP_NCLASS:        case OP_NCLASS:
1212  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF && defined COMPILE_PCRE8
1213        if (utf8)        if (utf)
1214          {          {
1215          start_bits[24] |= 0xf0;              /* Bits for 0xc4 - 0xc8 */          start_bits[24] |= 0xf0;              /* Bits for 0xc4 - 0xc8 */
1216          memset(start_bits+25, 0xff, 7);      /* Bits for 0xc9 - 0xff */          memset(start_bits+25, 0xff, 7);      /* Bits for 0xc9 - 0xff */
1217          }          }
1218  #endif  #endif
1219    #ifdef COMPILE_PCRE16
1220          SET_BIT(0xFF);                         /* For characters > 255 */
1221    #endif
1222        /* Fall through */        /* Fall through */
1223    
1224        case OP_CLASS:        case OP_CLASS:
1225          {          {
1226            pcre_uint8 *map;
1227          tcode++;          tcode++;
1228            map = (pcre_uint8 *)tcode;
1229    
1230          /* In UTF-8 mode, the bits in a bit map correspond to character          /* In UTF-8 mode, the bits in a bit map correspond to character
1231          values, not to byte values. However, the bit map we are constructing is          values, not to byte values. However, the bit map we are constructing is
# Line 413  do Line 1233  do
1233          value is > 127. In fact, there are only two possible starting bytes for          value is > 127. In fact, there are only two possible starting bytes for
1234          characters in the range 128 - 255. */          characters in the range 128 - 255. */
1235    
1236  #ifdef SUPPORT_UTF8  #if defined SUPPORT_UTF && defined COMPILE_PCRE8
1237          if (utf8)          if (utf)
1238            {            {
1239            for (c = 0; c < 16; c++) start_bits[c] |= tcode[c];            for (c = 0; c < 16; c++) start_bits[c] |= map[c];
1240            for (c = 128; c < 256; c++)            for (c = 128; c < 256; c++)
1241              {              {
1242              if ((tcode[c/8] && (1 << (c&7))) != 0)              if ((map[c/8] && (1 << (c&7))) != 0)
1243                {                {
1244                int d = (c >> 6) | 0xc0;            /* Set bit for this starter */                int d = (c >> 6) | 0xc0;            /* Set bit for this starter */
1245                start_bits[d/8] |= (1 << (d&7));    /* and then skip on to the */                start_bits[d/8] |= (1 << (d&7));    /* and then skip on to the */
# Line 427  do Line 1247  do
1247                }                }
1248              }              }
1249            }            }
   
         /* In non-UTF-8 mode, the two bit maps are completely compatible. */  
   
1250          else          else
1251  #endif  #endif
1252            {            {
1253            for (c = 0; c < 32; c++) start_bits[c] |= tcode[c];            /* In non-UTF-8 mode, the two bit maps are completely compatible. */
1254              for (c = 0; c < 32; c++) start_bits[c] |= map[c];
1255            }            }
1256    
1257          /* Advance past the bit map, and act on what follows */          /* Advance past the bit map, and act on what follows. For a zero
1258            minimum repeat, continue; otherwise stop processing. */
1259    
1260          tcode += 32;          tcode += 32 / sizeof(pcre_uchar);
1261          switch (*tcode)          switch (*tcode)
1262            {            {
1263            case OP_CRSTAR:            case OP_CRSTAR:
# Line 450  do Line 1269  do
1269    
1270            case OP_CRRANGE:            case OP_CRRANGE:
1271            case OP_CRMINRANGE:            case OP_CRMINRANGE:
1272            if (((tcode[1] << 8) + tcode[2]) == 0) tcode += 5;            if (GET2(tcode, 1) == 0) tcode += 1 + 2 * IMM2_SIZE;
1273              else try_next = FALSE;              else try_next = FALSE;
1274            break;            break;
1275    
# Line 472  return yield; Line 1291  return yield;
1291    
1292    
1293    
1294    
1295    
1296  /*************************************************  /*************************************************
1297  *          Study a compiled expression           *  *          Study a compiled expression           *
1298  *************************************************/  *************************************************/
1299    
1300  /* This function is handed a compiled expression that it must study to produce  /* This function is handed a compiled expression that it must study to produce
1301  information that will speed up the matching. It returns a pcre_extra block  information that will speed up the matching. It returns a pcre[16]_extra block
1302  which then gets handed back to pcre_exec().  which then gets handed back to pcre_exec().
1303    
1304  Arguments:  Arguments:
# Line 486  Arguments: Line 1307  Arguments:
1307    errorptr  points to where to place error messages;    errorptr  points to where to place error messages;
1308              set NULL unless error              set NULL unless error
1309    
1310  Returns:    pointer to a pcre_extra block, with study_data filled in and the  Returns:    pointer to a pcre[16]_extra block, with study_data filled in and
1311                appropriate flag set;                the appropriate flags set;
1312              NULL on error or if no optimization possible              NULL on error or if no optimization possible
1313  */  */
1314    
1315  PCRE_DATA_SCOPE pcre_extra *  #ifdef COMPILE_PCRE8
1316    PCRE_EXP_DEFN pcre_extra * PCRE_CALL_CONVENTION
1317  pcre_study(const pcre *external_re, int options, const char **errorptr)  pcre_study(const pcre *external_re, int options, const char **errorptr)
1318    #else
1319    PCRE_EXP_DEFN pcre16_extra * PCRE_CALL_CONVENTION
1320    pcre16_study(const pcre16 *external_re, int options, const char **errorptr)
1321    #endif
1322  {  {
1323  uschar start_bits[32];  int min;
1324  pcre_extra *extra;  BOOL bits_set = FALSE;
1325    pcre_uint8 start_bits[32];
1326    PUBL(extra) *extra = NULL;
1327  pcre_study_data *study;  pcre_study_data *study;
1328  const uschar *tables;  const pcre_uint8 *tables;
1329  uschar *code;  pcre_uchar *code;
1330  compile_data compile_block;  compile_data compile_block;
1331  const real_pcre *re = (const real_pcre *)external_re;  const REAL_PCRE *re = (const REAL_PCRE *)external_re;
1332    
1333  *errorptr = NULL;  *errorptr = NULL;
1334    
# Line 510  if (re == NULL || re->magic_number != MA Line 1338  if (re == NULL || re->magic_number != MA
1338    return NULL;    return NULL;
1339    }    }
1340    
1341    if ((re->flags & PCRE_MODE) == 0)
1342      {
1343    #ifdef COMPILE_PCRE8
1344      *errorptr = "argument is compiled in 16 bit mode";
1345    #else
1346      *errorptr = "argument is compiled in 8 bit mode";
1347    #endif
1348      return NULL;
1349      }
1350    
1351  if ((options & ~PUBLIC_STUDY_OPTIONS) != 0)  if ((options & ~PUBLIC_STUDY_OPTIONS) != 0)
1352    {    {
1353    *errorptr = "unknown or incorrect option bit(s) set";    *errorptr = "unknown or incorrect option bit(s) set";
1354    return NULL;    return NULL;
1355    }    }
1356    
1357  code = (uschar *)re + re->name_table_offset +  code = (pcre_uchar *)re + re->name_table_offset +
1358    (re->name_count * re->name_entry_size);    (re->name_count * re->name_entry_size);
1359    
1360  /* For an anchored pattern, or an unanchored pattern that has a first char, or  /* For an anchored pattern, or an unanchored pattern that has a first char, or
1361  a multiline pattern that matches only at "line starts", no further processing  a multiline pattern that matches only at "line starts", there is no point in
1362  at present. */  seeking a list of starting bytes. */
1363    
1364  if ((re->options & (PCRE_ANCHORED|PCRE_FIRSTSET|PCRE_STARTLINE)) != 0)  if ((re->options & PCRE_ANCHORED) == 0 &&
1365    return NULL;      (re->flags & (PCRE_FIRSTSET|PCRE_STARTLINE)) == 0)
1366      {
1367      int rc;
1368    
1369  /* Set the character tables in the block that is passed around */    /* Set the character tables in the block that is passed around */
1370    
1371  tables = re->tables;    tables = re->tables;
 if (tables == NULL)  
   (void)pcre_fullinfo(external_re, NULL, PCRE_INFO_DEFAULT_TABLES,  
   (void *)(&tables));  
   
 compile_block.lcc = tables + lcc_offset;  
 compile_block.fcc = tables + fcc_offset;  
 compile_block.cbits = tables + cbits_offset;  
 compile_block.ctypes = tables + ctypes_offset;  
   
 /* See if we can find a fixed set of initial characters for the pattern. */  
   
 memset(start_bits, 0, 32 * sizeof(uschar));  
 if (set_start_bits(code, start_bits, (re->options & PCRE_CASELESS) != 0,  
   (re->options & PCRE_UTF8) != 0, &compile_block) != SSB_DONE) return NULL;  
   
 /* Get a pcre_extra block and a pcre_study_data block. The study data is put in  
 the latter, which is pointed to by the former, which may also get additional  
 data set later by the calling program. At the moment, the size of  
 pcre_study_data is fixed. We nevertheless save it in a field for returning via  
 the pcre_fullinfo() function so that if it becomes variable in the future, we  
 don't have to change that code. */  
1372    
1373  extra = (pcre_extra *)(pcre_malloc)  #ifdef COMPILE_PCRE8
1374    (sizeof(pcre_extra) + sizeof(pcre_study_data));    if (tables == NULL)
1375        (void)pcre_fullinfo(external_re, NULL, PCRE_INFO_DEFAULT_TABLES,
1376        (void *)(&tables));
1377    #else
1378      if (tables == NULL)
1379        (void)pcre16_fullinfo(external_re, NULL, PCRE_INFO_DEFAULT_TABLES,
1380        (void *)(&tables));
1381    #endif
1382    
1383  if (extra == NULL)    compile_block.lcc = tables + lcc_offset;
1384      compile_block.fcc = tables + fcc_offset;
1385      compile_block.cbits = tables + cbits_offset;
1386      compile_block.ctypes = tables + ctypes_offset;
1387    
1388      /* See if we can find a fixed set of initial characters for the pattern. */
1389    
1390      memset(start_bits, 0, 32 * sizeof(pcre_uint8));
1391      rc = set_start_bits(code, start_bits, (re->options & PCRE_UTF8) != 0,
1392        &compile_block);
1393      bits_set = rc == SSB_DONE;
1394      if (rc == SSB_UNKNOWN)
1395        {
1396        *errorptr = "internal error: opcode not recognized";
1397        return NULL;
1398        }
1399      }
1400    
1401    /* Find the minimum length of subject string. */
1402    
1403    switch(min = find_minlength(code, code, re->options, 0))
1404    {    {
1405    *errorptr = "failed to get memory";    case -2: *errorptr = "internal error: missing capturing bracket"; return NULL;
1406    return NULL;    case -3: *errorptr = "internal error: opcode not recognized"; return NULL;
1407      default: break;
1408    }    }
1409    
1410  study = (pcre_study_data *)((char *)extra + sizeof(pcre_extra));  /* If a set of starting bytes has been identified, or if the minimum length is
1411  extra->flags = PCRE_EXTRA_STUDY_DATA;  greater than zero, or if JIT optimization has been requested, get a
1412  extra->study_data = study;  pcre[16]_extra block and a pcre_study_data block. The study data is put in the
1413    latter, which is pointed to by the former, which may also get additional data
1414  study->size = sizeof(pcre_study_data);  set later by the calling program. At the moment, the size of pcre_study_data
1415  study->options = PCRE_STUDY_MAPPED;  is fixed. We nevertheless save it in a field for returning via the
1416  memcpy(study->start_bits, start_bits, sizeof(start_bits));  pcre_fullinfo() function so that if it becomes variable in the future,
1417    we don't have to change that code. */
1418    
1419    if (bits_set || min > 0
1420    #ifdef SUPPORT_JIT
1421        || (options & (PCRE_STUDY_JIT_COMPILE | PCRE_STUDY_JIT_PARTIAL_SOFT_COMPILE
1422                     | PCRE_STUDY_JIT_PARTIAL_HARD_COMPILE)) != 0
1423    #endif
1424      )
1425      {
1426      extra = (PUBL(extra) *)(PUBL(malloc))
1427        (sizeof(PUBL(extra)) + sizeof(pcre_study_data));
1428      if (extra == NULL)
1429        {
1430        *errorptr = "failed to get memory";
1431        return NULL;
1432        }
1433    
1434      study = (pcre_study_data *)((char *)extra + sizeof(PUBL(extra)));
1435      extra->flags = PCRE_EXTRA_STUDY_DATA;
1436      extra->study_data = study;
1437    
1438      study->size = sizeof(pcre_study_data);
1439      study->flags = 0;
1440    
1441      /* Set the start bits always, to avoid unset memory errors if the
1442      study data is written to a file, but set the flag only if any of the bits
1443      are set, to save time looking when none are. */
1444    
1445      if (bits_set)
1446        {
1447        study->flags |= PCRE_STUDY_MAPPED;
1448        memcpy(study->start_bits, start_bits, sizeof(start_bits));
1449        }
1450      else memset(study->start_bits, 0, 32 * sizeof(pcre_uint8));
1451    
1452    #ifdef PCRE_DEBUG
1453      if (bits_set)
1454        {
1455        pcre_uint8 *ptr = start_bits;
1456        int i;
1457    
1458        printf("Start bits:\n");
1459        for (i = 0; i < 32; i++)
1460          printf("%3d: %02x%s", i * 8, *ptr++, ((i + 1) & 0x7) != 0? " " : "\n");
1461        }
1462    #endif
1463    
1464      /* Always set the minlength value in the block, because the JIT compiler
1465      makes use of it. However, don't set the bit unless the length is greater than
1466      zero - the interpretive pcre_exec() and pcre_dfa_exec() needn't waste time
1467      checking the zero case. */
1468    
1469      if (min > 0)
1470        {
1471        study->flags |= PCRE_STUDY_MINLEN;
1472        study->minlength = min;
1473        }
1474      else study->minlength = 0;
1475    
1476      /* If JIT support was compiled and requested, attempt the JIT compilation.
1477      If no starting bytes were found, and the minimum length is zero, and JIT
1478      compilation fails, abandon the extra block and return NULL. */
1479    
1480    #ifdef SUPPORT_JIT
1481      extra->executable_jit = NULL;
1482      if ((options & PCRE_STUDY_JIT_COMPILE) != 0)
1483        PRIV(jit_compile)(re, extra, JIT_COMPILE);
1484      if ((options & PCRE_STUDY_JIT_PARTIAL_SOFT_COMPILE) != 0)
1485        PRIV(jit_compile)(re, extra, JIT_PARTIAL_SOFT_COMPILE);
1486      if ((options & PCRE_STUDY_JIT_PARTIAL_HARD_COMPILE) != 0)
1487        PRIV(jit_compile)(re, extra, JIT_PARTIAL_HARD_COMPILE);
1488    
1489      if (study->flags == 0 && (extra->flags & PCRE_EXTRA_EXECUTABLE_JIT) == 0)
1490        {
1491    #ifdef COMPILE_PCRE8
1492        pcre_free_study(extra);
1493    #endif
1494    #ifdef COMPILE_PCRE16
1495        pcre16_free_study(extra);
1496    #endif
1497        extra = NULL;
1498        }
1499    #endif
1500      }
1501    
1502  return extra;  return extra;
1503  }  }
1504    
1505    
1506    /*************************************************
1507    *          Free the study data                   *
1508    *************************************************/
1509    
1510    /* This function frees the memory that was obtained by pcre_study().
1511    
1512    Argument:   a pointer to the pcre[16]_extra block
1513    Returns:    nothing
1514    */
1515    
1516    #ifdef COMPILE_PCRE8
1517    PCRE_EXP_DEFN void
1518    pcre_free_study(pcre_extra *extra)
1519    #else
1520    PCRE_EXP_DEFN void
1521    pcre16_free_study(pcre16_extra *extra)
1522    #endif
1523    {
1524    if (extra == NULL)
1525      return;
1526    #ifdef SUPPORT_JIT
1527    if ((extra->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0 &&
1528         extra->executable_jit != NULL)
1529      PRIV(jit_free)(extra->executable_jit);
1530    #endif
1531    PUBL(free)(extra);
1532    }
1533    
1534  /* End of pcre_study.c */  /* End of pcre_study.c */

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