/[pcre]/code/trunk/pcre_dfa_exec.c
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revision 391 by ph10, Tue Mar 17 21:16:01 2009 UTC revision 392 by ph10, Tue Mar 17 21:30:30 2009 UTC
# Line 3  Line 3 
3  *************************************************/  *************************************************/
4    
5  /* PCRE is a library of functions to support regular expressions whose syntax  /* 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 (but see  and semantics are as close as possible to those of the Perl 5 language (but see
7  below for why this module is different).  below for why this module is different).
8    
9                         Written by Philip Hazel                         Written by Philip Hazel
# Line 2747  for (;;) Line 2747  for (;;)
2747        while (t < md->end_subject && !IS_NEWLINE(t)) t++;        while (t < md->end_subject && !IS_NEWLINE(t)) t++;
2748        end_subject = t;        end_subject = t;
2749        }        }
2750    
2751      /* There are some optimizations that avoid running the match if a known      /* There are some optimizations that avoid running the match if a known
2752      starting point is not found, or if a known later character is not present.      starting point is not found, or if a known later character is not present.
2753      However, there is an option that disables these, for testing and for      However, there is an option that disables these, for testing and for
2754      ensuring that all callouts do actually occur. */      ensuring that all callouts do actually occur. */
2755    
2756      if ((options & PCRE_NO_START_OPTIMIZE) == 0)      if ((options & PCRE_NO_START_OPTIMIZE) == 0)
2757        {        {
2758    
2759        /* Advance to a known first byte. */        /* Advance to a known first byte. */
2760    
2761        if (first_byte >= 0)        if (first_byte >= 0)
2762          {          {
2763          if (first_byte_caseless)          if (first_byte_caseless)
# Line 2765  for (;;) Line 2765  for (;;)
2765                   lcc[*current_subject] != first_byte)                   lcc[*current_subject] != first_byte)
2766              current_subject++;              current_subject++;
2767          else          else
2768            while (current_subject < end_subject &&            while (current_subject < end_subject &&
2769                   *current_subject != first_byte)                   *current_subject != first_byte)
2770              current_subject++;              current_subject++;
2771          }          }
2772    
2773        /* Or to just after a linebreak for a multiline match if possible */        /* Or to just after a linebreak for a multiline match if possible */
2774    
2775        else if (startline)        else if (startline)
2776          {          {
2777          if (current_subject > md->start_subject + start_offset)          if (current_subject > md->start_subject + start_offset)
# Line 2779  for (;;) Line 2779  for (;;)
2779  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
2780            if (utf8)            if (utf8)
2781              {              {
2782              while (current_subject < end_subject &&              while (current_subject < end_subject &&
2783                     !WAS_NEWLINE(current_subject))                     !WAS_NEWLINE(current_subject))
2784                {                {
2785                current_subject++;                current_subject++;
# Line 2792  for (;;) Line 2792  for (;;)
2792  #endif  #endif
2793            while (current_subject < end_subject && !WAS_NEWLINE(current_subject))            while (current_subject < end_subject && !WAS_NEWLINE(current_subject))
2794              current_subject++;              current_subject++;
2795    
2796            /* If we have just passed a CR and the newline option is ANY or            /* If we have just passed a CR and the newline option is ANY or
2797            ANYCRLF, and we are now at a LF, advance the match position by one            ANYCRLF, and we are now at a LF, advance the match position by one
2798            more character. */            more character. */
2799    
2800            if (current_subject[-1] == CHAR_CR &&            if (current_subject[-1] == CHAR_CR &&
2801                 (md->nltype == NLTYPE_ANY || md->nltype == NLTYPE_ANYCRLF) &&                 (md->nltype == NLTYPE_ANY || md->nltype == NLTYPE_ANYCRLF) &&
2802                 current_subject < end_subject &&                 current_subject < end_subject &&
# Line 2804  for (;;) Line 2804  for (;;)
2804              current_subject++;              current_subject++;
2805            }            }
2806          }          }
2807    
2808        /* Or to a non-unique first char after study */        /* Or to a non-unique first char after study */
2809    
2810        else if (start_bits != NULL)        else if (start_bits != NULL)
2811          {          {
2812          while (current_subject < end_subject)          while (current_subject < end_subject)
# Line 2816  for (;;) Line 2816  for (;;)
2816              else break;              else break;
2817            }            }
2818          }          }
2819        }        }
2820    
2821      /* Restore fudged end_subject */      /* Restore fudged end_subject */
2822    
# Line 2836  for (;;) Line 2836  for (;;)
2836    showed up when somebody was matching /^C/ on a 32-megabyte string... so we    showed up when somebody was matching /^C/ on a 32-megabyte string... so we
2837    don't do this when the string is sufficiently long.    don't do this when the string is sufficiently long.
2838    
2839    ALSO: this processing is disabled when partial matching is requested, and can    ALSO: this processing is disabled when partial matching is requested, and can
2840    also be explicitly deactivated. */    also be explicitly deactivated. */
2841    
2842    if ((options & PCRE_NO_START_OPTIMIZE) == 0 &&    if ((options & PCRE_NO_START_OPTIMIZE) == 0 &&
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