/[pcre]/code/trunk/pcre_study.c
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revision 93 by nigel, Sat Feb 24 21:41:42 2007 UTC revision 305 by ph10, Sun Jan 20 20:07:32 2008 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) 1997-2008 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    
# Line 394  do Line 398  do
398        character with a value > 255. */        character with a value > 255. */
399    
400        case OP_NCLASS:        case OP_NCLASS:
401    #ifdef SUPPORT_UTF8
402        if (utf8)        if (utf8)
403          {          {
404          start_bits[24] |= 0xf0;              /* Bits for 0xc4 - 0xc8 */          start_bits[24] |= 0xf0;              /* Bits for 0xc4 - 0xc8 */
405          memset(start_bits+25, 0xff, 7);      /* Bits for 0xc9 - 0xff */          memset(start_bits+25, 0xff, 7);      /* Bits for 0xc9 - 0xff */
406          }          }
407    #endif
408        /* Fall through */        /* Fall through */
409    
410        case OP_CLASS:        case OP_CLASS:
# Line 411  do Line 417  do
417          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
418          characters in the range 128 - 255. */          characters in the range 128 - 255. */
419    
420    #ifdef SUPPORT_UTF8
421          if (utf8)          if (utf8)
422            {            {
423            for (c = 0; c < 16; c++) start_bits[c] |= tcode[c];            for (c = 0; c < 16; c++) start_bits[c] |= tcode[c];
# Line 428  do Line 435  do
435          /* In non-UTF-8 mode, the two bit maps are completely compatible. */          /* In non-UTF-8 mode, the two bit maps are completely compatible. */
436    
437          else          else
438    #endif
439            {            {
440            for (c = 0; c < 32; c++) start_bits[c] |= tcode[c];            for (c = 0; c < 32; c++) start_bits[c] |= tcode[c];
441            }            }
# Line 487  Returns: pointer to a pcre_extra bloc Line 495  Returns: pointer to a pcre_extra bloc
495              NULL on error or if no optimization possible              NULL on error or if no optimization possible
496  */  */
497    
498  PCRE_DATA_SCOPE pcre_extra *  PCRE_EXP_DEFN pcre_extra *
499  pcre_study(const pcre *external_re, int options, const char **errorptr)  pcre_study(const pcre *external_re, int options, const char **errorptr)
500  {  {
501  uschar start_bits[32];  uschar start_bits[32];
# Line 519  code = (uschar *)re + re->name_table_off Line 527  code = (uschar *)re + re->name_table_off
527  a multiline pattern that matches only at "line starts", no further processing  a multiline pattern that matches only at "line starts", no further processing
528  at present. */  at present. */
529    
530  if ((re->options & (PCRE_ANCHORED|PCRE_FIRSTSET|PCRE_STARTLINE)) != 0)  if ((re->options & PCRE_ANCHORED) != 0 ||
531        (re->flags & (PCRE_FIRSTSET|PCRE_STARTLINE)) != 0)
532    return NULL;    return NULL;
533    
534  /* Set the character tables in the block that is passed around */  /* Set the character tables in the block that is passed around */
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