/[pcre]/code/trunk/pcre_dfa_exec.c
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revision 361 by ph10, Thu Jul 10 16:03:28 2008 UTC revision 455 by ph10, Sat Sep 26 19:12:32 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.  and semantics are as close as possible to those of the Perl 5 language (but see
7    below for why this module is different).
8    
9                         Written by Philip Hazel                         Written by Philip Hazel
10             Copyright (c) 1997-2008 University of Cambridge             Copyright (c) 1997-2009 University of Cambridge
11    
12  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
13  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 44  FSM). This is NOT Perl- compatible, but Line 45  FSM). This is NOT Perl- compatible, but
45  applications. */  applications. */
46    
47    
48    /* NOTE ABOUT PERFORMANCE: A user of this function sent some code that improved
49    the performance of his patterns greatly. I could not use it as it stood, as it
50    was not thread safe, and made assumptions about pattern sizes. Also, it caused
51    test 7 to loop, and test 9 to crash with a segfault.
52    
53    The issue is the check for duplicate states, which is done by a simple linear
54    search up the state list. (Grep for "duplicate" below to find the code.) For
55    many patterns, there will never be many states active at one time, so a simple
56    linear search is fine. In patterns that have many active states, it might be a
57    bottleneck. The suggested code used an indexing scheme to remember which states
58    had previously been used for each character, and avoided the linear search when
59    it knew there was no chance of a duplicate. This was implemented when adding
60    states to the state lists.
61    
62    I wrote some thread-safe, not-limited code to try something similar at the time
63    of checking for duplicates (instead of when adding states), using index vectors
64    on the stack. It did give a 13% improvement with one specially constructed
65    pattern for certain subject strings, but on other strings and on many of the
66    simpler patterns in the test suite it did worse. The major problem, I think,
67    was the extra time to initialize the index. This had to be done for each call
68    of internal_dfa_exec(). (The supplied patch used a static vector, initialized
69    only once - I suspect this was the cause of the problems with the tests.)
70    
71    Overall, I concluded that the gains in some cases did not outweigh the losses
72    in others, so I abandoned this code. */
73    
74    
75    
76  #ifdef HAVE_CONFIG_H  #ifdef HAVE_CONFIG_H
77  #include "config.h"  #include "config.h"
78  #endif  #endif
# Line 60  applications. */ Line 89  applications. */
89  #define SP "                   "  #define SP "                   "
90    
91    
   
92  /*************************************************  /*************************************************
93  *      Code parameters and static tables         *  *      Code parameters and static tables         *
94  *************************************************/  *************************************************/
# Line 389  if (*first_op == OP_REVERSE) Line 417  if (*first_op == OP_REVERSE)
417        current_subject - start_subject : max_back;        current_subject - start_subject : max_back;
418      current_subject -= gone_back;      current_subject -= gone_back;
419      }      }
420    
421      /* Save the earliest consulted character */
422    
423      if (current_subject < md->start_used_ptr)
424        md->start_used_ptr = current_subject;
425    
426    /* Now we can process the individual branches. */    /* Now we can process the individual branches. */
427    
# Line 454  for (;;) Line 487  for (;;)
487    int i, j;    int i, j;
488    int clen, dlen;    int clen, dlen;
489    unsigned int c, d;    unsigned int c, d;
490      int forced_fail = 0;
491      int reached_end = 0;
492    
493    /* Make the new state list into the active state list and empty the    /* Make the new state list into the active state list and empty the
494    new state list. */    new state list. */
# Line 511  for (;;) Line 546  for (;;)
546      stateblock *current_state = active_states + i;      stateblock *current_state = active_states + i;
547      const uschar *code;      const uschar *code;
548      int state_offset = current_state->offset;      int state_offset = current_state->offset;
549      int count, codevalue;      int count, codevalue, rrc;
550    
551  #ifdef DEBUG  #ifdef DEBUG
552      printf ("%.*sProcessing state %d c=", rlevel*2-2, SP, state_offset);      printf ("%.*sProcessing state %d c=", rlevel*2-2, SP, state_offset);
# Line 543  for (;;) Line 578  for (;;)
578          }          }
579        }        }
580    
581      /* Check for a duplicate state with the same count, and skip if found. */      /* Check for a duplicate state with the same count, and skip if found.
582        See the note at the head of this module about the possibility of improving
583        performance here. */
584    
585      for (j = 0; j < i; j++)      for (j = 0; j < i; j++)
586        {        {
# Line 610  for (;;) Line 647  for (;;)
647  /* ========================================================================== */  /* ========================================================================== */
648        /* Reached a closing bracket. If not at the end of the pattern, carry        /* Reached a closing bracket. If not at the end of the pattern, carry
649        on with the next opcode. Otherwise, unless we have an empty string and        on with the next opcode. Otherwise, unless we have an empty string and
650        PCRE_NOTEMPTY is set, save the match data, shifting up all previous        PCRE_NOTEMPTY is set, or PCRE_NOTEMPTY_ATSTART is set and we are at the
651          start of the subject, save the match data, shifting up all previous
652        matches so we always have the longest first. */        matches so we always have the longest first. */
653    
654        case OP_KET:        case OP_KET:
# Line 624  for (;;) Line 662  for (;;)
662            ADD_ACTIVE(state_offset - GET(code, 1), 0);            ADD_ACTIVE(state_offset - GET(code, 1), 0);
663            }            }
664          }          }
665        else if (ptr > current_subject || (md->moptions & PCRE_NOTEMPTY) == 0)        else
666          {          {
667          if (match_count < 0) match_count = (offsetcount >= 2)? 1 : 0;          reached_end++;    /* Count branches that reach the end */
668            else if (match_count > 0 && ++match_count * 2 >= offsetcount)          if (ptr > current_subject ||
669              match_count = 0;              ((md->moptions & PCRE_NOTEMPTY) == 0 &&
670          count = ((match_count == 0)? offsetcount : match_count * 2) - 2;                ((md->moptions & PCRE_NOTEMPTY_ATSTART) == 0 ||
671          if (count > 0) memmove(offsets + 2, offsets, count * sizeof(int));                  current_subject > start_subject + md->start_offset)))
672          if (offsetcount >= 2)            {
673            {            if (match_count < 0) match_count = (offsetcount >= 2)? 1 : 0;
674            offsets[0] = current_subject - start_subject;              else if (match_count > 0 && ++match_count * 2 >= offsetcount)
675            offsets[1] = ptr - start_subject;                match_count = 0;
676            DPRINTF(("%.*sSet matched string = \"%.*s\"\n", rlevel*2-2, SP,            count = ((match_count == 0)? offsetcount : match_count * 2) - 2;
677              offsets[1] - offsets[0], current_subject));            if (count > 0) memmove(offsets + 2, offsets, count * sizeof(int));
678            }            if (offsetcount >= 2)
679          if ((md->moptions & PCRE_DFA_SHORTEST) != 0)              {
680            {              offsets[0] = current_subject - start_subject;
681            DPRINTF(("%.*sEnd of internal_dfa_exec %d: returning %d\n"              offsets[1] = ptr - start_subject;
682              "%.*s---------------------\n\n", rlevel*2-2, SP, rlevel,              DPRINTF(("%.*sSet matched string = \"%.*s\"\n", rlevel*2-2, SP,
683              match_count, rlevel*2-2, SP));                offsets[1] - offsets[0], current_subject));
684            return match_count;              }
685            }            if ((md->moptions & PCRE_DFA_SHORTEST) != 0)
686                {
687                DPRINTF(("%.*sEnd of internal_dfa_exec %d: returning %d\n"
688                  "%.*s---------------------\n\n", rlevel*2-2, SP, rlevel,
689                  match_count, rlevel*2-2, SP));
690                return match_count;
691                }
692              }
693          }          }
694        break;        break;
695    
# Line 757  for (;;) Line 802  for (;;)
802        if ((md->moptions & PCRE_NOTEOL) == 0)        if ((md->moptions & PCRE_NOTEOL) == 0)
803          {          {
804          if (clen == 0 ||          if (clen == 0 ||
805              (IS_NEWLINE(ptr) &&              ((md->poptions & PCRE_DOLLAR_ENDONLY) == 0 && IS_NEWLINE(ptr) &&
806                 ((ims & PCRE_MULTILINE) != 0 || ptr == end_subject - md->nllen)                 ((ims & PCRE_MULTILINE) != 0 || ptr == end_subject - md->nllen)
807              ))              ))
808            { ADD_ACTIVE(state_offset + 1, 0); }            { ADD_ACTIVE(state_offset + 1, 0); }
# Line 794  for (;;) Line 839  for (;;)
839          if (ptr > start_subject)          if (ptr > start_subject)
840            {            {
841            const uschar *temp = ptr - 1;            const uschar *temp = ptr - 1;
842              if (temp < md->start_used_ptr) md->start_used_ptr = temp;
843  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
844            if (utf8) BACKCHAR(temp);            if (utf8) BACKCHAR(temp);
845  #endif  #endif
# Line 802  for (;;) Line 848  for (;;)
848            }            }
849          else left_word = 0;          else left_word = 0;
850    
851          if (clen > 0) right_word = c < 256 && (ctypes[c] & ctype_word) != 0;          if (clen > 0)
852            else right_word = 0;            right_word = c < 256 && (ctypes[c] & ctype_word) != 0;
853            else              /* This is a fudge to ensure that if this is the */
854              {               /* last item in the pattern, we don't count it as */
855              reached_end--;  /* reached, thus disabling a partial match. */
856              right_word = 0;
857              }
858    
859          if ((left_word == right_word) == (codevalue == OP_NOT_WORD_BOUNDARY))          if ((left_word == right_word) == (codevalue == OP_NOT_WORD_BOUNDARY))
860            { ADD_ACTIVE(state_offset + 1, 0); }            { ADD_ACTIVE(state_offset + 1, 0); }
# Line 2157  for (;;) Line 2208  for (;;)
2208    
2209  /* ========================================================================== */  /* ========================================================================== */
2210        /* These are the opcodes for fancy brackets of various kinds. We have        /* These are the opcodes for fancy brackets of various kinds. We have
2211        to use recursion in order to handle them. The "always failing" assersion        to use recursion in order to handle them. The "always failing" assertion
2212        (?!) is optimised when compiling to OP_FAIL, so we have to support that,        (?!) is optimised to OP_FAIL when compiling, so we have to support that,
2213        though the other "backtracking verbs" are not supported. */        though the other "backtracking verbs" are not supported. */
2214    
2215        case OP_FAIL:        case OP_FAIL:
2216          forced_fail++;    /* Count FAILs for multiple states */
2217        break;        break;
2218    
2219        case OP_ASSERT:        case OP_ASSERT:
# Line 2200  for (;;) Line 2252  for (;;)
2252          {          {
2253          int local_offsets[1000];          int local_offsets[1000];
2254          int local_workspace[1000];          int local_workspace[1000];
2255          int condcode = code[LINK_SIZE+1];          int codelink = GET(code, 1);
2256            int condcode;
2257    
2258            /* Because of the way auto-callout works during compile, a callout item
2259            is inserted between OP_COND and an assertion condition. This does not
2260            happen for the other conditions. */
2261    
2262            if (code[LINK_SIZE+1] == OP_CALLOUT)
2263              {
2264              rrc = 0;
2265              if (pcre_callout != NULL)
2266                {
2267                pcre_callout_block cb;
2268                cb.version          = 1;   /* Version 1 of the callout block */
2269                cb.callout_number   = code[LINK_SIZE+2];
2270                cb.offset_vector    = offsets;
2271                cb.subject          = (PCRE_SPTR)start_subject;
2272                cb.subject_length   = end_subject - start_subject;
2273                cb.start_match      = current_subject - start_subject;
2274                cb.current_position = ptr - start_subject;
2275                cb.pattern_position = GET(code, LINK_SIZE + 3);
2276                cb.next_item_length = GET(code, 3 + 2*LINK_SIZE);
2277                cb.capture_top      = 1;
2278                cb.capture_last     = -1;
2279                cb.callout_data     = md->callout_data;
2280                if ((rrc = (*pcre_callout)(&cb)) < 0) return rrc;   /* Abandon */
2281                }
2282              if (rrc > 0) break;                      /* Fail this thread */
2283              code += _pcre_OP_lengths[OP_CALLOUT];    /* Skip callout data */
2284              }
2285    
2286            condcode = code[LINK_SIZE+1];
2287    
2288          /* Back reference conditions are not supported */          /* Back reference conditions are not supported */
2289    
# Line 2209  for (;;) Line 2292  for (;;)
2292          /* The DEFINE condition is always false */          /* The DEFINE condition is always false */
2293    
2294          if (condcode == OP_DEF)          if (condcode == OP_DEF)
2295            {            { ADD_ACTIVE(state_offset + codelink + LINK_SIZE + 1, 0); }
           ADD_ACTIVE(state_offset + GET(code, 1) + LINK_SIZE + 1, 0);  
           }  
2296    
2297          /* The only supported version of OP_RREF is for the value RREF_ANY,          /* The only supported version of OP_RREF is for the value RREF_ANY,
2298          which means "test if in any recursion". We can't test for specifically          which means "test if in any recursion". We can't test for specifically
# Line 2221  for (;;) Line 2302  for (;;)
2302            {            {
2303            int value = GET2(code, LINK_SIZE+2);            int value = GET2(code, LINK_SIZE+2);
2304            if (value != RREF_ANY) return PCRE_ERROR_DFA_UCOND;            if (value != RREF_ANY) return PCRE_ERROR_DFA_UCOND;
2305            if (recursing > 0) { ADD_ACTIVE(state_offset + LINK_SIZE + 4, 0); }            if (recursing > 0)
2306              else { ADD_ACTIVE(state_offset + GET(code, 1) + LINK_SIZE + 1, 0); }              { ADD_ACTIVE(state_offset + LINK_SIZE + 4, 0); }
2307              else { ADD_ACTIVE(state_offset + codelink + LINK_SIZE + 1, 0); }
2308            }            }
2309    
2310          /* Otherwise, the condition is an assertion */          /* Otherwise, the condition is an assertion */
# Line 2252  for (;;) Line 2334  for (;;)
2334                  (condcode == OP_ASSERT || condcode == OP_ASSERTBACK))                  (condcode == OP_ASSERT || condcode == OP_ASSERTBACK))
2335              { ADD_ACTIVE(endasscode + LINK_SIZE + 1 - start_code, 0); }              { ADD_ACTIVE(endasscode + LINK_SIZE + 1 - start_code, 0); }
2336            else            else
2337              { ADD_ACTIVE(state_offset + GET(code, 1) + LINK_SIZE + 1, 0); }              { ADD_ACTIVE(state_offset + codelink + LINK_SIZE + 1, 0); }
2338            }            }
2339          }          }
2340        break;        break;
# Line 2404  for (;;) Line 2486  for (;;)
2486        /* Handle callouts */        /* Handle callouts */
2487    
2488        case OP_CALLOUT:        case OP_CALLOUT:
2489          rrc = 0;
2490        if (pcre_callout != NULL)        if (pcre_callout != NULL)
2491          {          {
         int rrc;  
2492          pcre_callout_block cb;          pcre_callout_block cb;
2493          cb.version          = 1;   /* Version 1 of the callout block */          cb.version          = 1;   /* Version 1 of the callout block */
2494          cb.callout_number   = code[1];          cb.callout_number   = code[1];
# Line 2421  for (;;) Line 2503  for (;;)
2503          cb.capture_last     = -1;          cb.capture_last     = -1;
2504          cb.callout_data     = md->callout_data;          cb.callout_data     = md->callout_data;
2505          if ((rrc = (*pcre_callout)(&cb)) < 0) return rrc;   /* Abandon */          if ((rrc = (*pcre_callout)(&cb)) < 0) return rrc;   /* Abandon */
         if (rrc == 0) { ADD_ACTIVE(state_offset + 2 + 2*LINK_SIZE, 0); }  
2506          }          }
2507          if (rrc == 0)
2508            { ADD_ACTIVE(state_offset + _pcre_OP_lengths[OP_CALLOUT], 0); }
2509        break;        break;
2510    
2511    
# Line 2438  for (;;) Line 2521  for (;;)
2521    /* We have finished the processing at the current subject character. If no    /* We have finished the processing at the current subject character. If no
2522    new states have been set for the next character, we have found all the    new states have been set for the next character, we have found all the
2523    matches that we are going to find. If we are at the top level and partial    matches that we are going to find. If we are at the top level and partial
2524    matching has been requested, check for appropriate conditions. */    matching has been requested, check for appropriate conditions. The "forced_
2525      fail" variable counts the number of (*F) encountered for the character. If it
2526      is equal to the original active_count (saved in workspace[1]) it means that
2527      (*F) was found on every active state. In this case we don't want to give a
2528      partial match. */
2529    
2530    if (new_count <= 0)    if (new_count <= 0)
2531      {      {
2532      if (match_count < 0 &&                     /* No matches found */      if (rlevel == 1 &&                               /* Top level, and */
2533          rlevel == 1 &&                         /* Top level match function */          reached_end != workspace[1] &&               /* Not all reached end */
2534          (md->moptions & PCRE_PARTIAL) != 0 &&  /* Want partial matching */          forced_fail != workspace[1] &&               /* Not all forced fail & */
2535          ptr >= end_subject &&                  /* Reached end of subject */          (                                            /* either... */
2536          ptr > current_subject)                 /* Matched non-empty string */          (md->moptions & PCRE_PARTIAL_HARD) != 0      /* Hard partial */
2537            ||                                           /* or... */
2538            ((md->moptions & PCRE_PARTIAL_SOFT) != 0 &&  /* Soft partial and */
2539             match_count < 0)                            /* no matches */
2540            ) &&                                         /* And... */
2541            ptr >= end_subject &&                     /* Reached end of subject */
2542            ptr > current_subject)                    /* Matched non-empty string */
2543        {        {
2544        if (offsetcount >= 2)        if (offsetcount >= 2)
2545          {          {
2546          offsets[0] = current_subject - start_subject;          offsets[0] = md->start_used_ptr - start_subject;
2547          offsets[1] = end_subject - start_subject;          offsets[1] = end_subject - start_subject;
2548          }          }
2549        match_count = PCRE_ERROR_PARTIAL;        match_count = PCRE_ERROR_PARTIAL;
# Line 2558  if (extra_data != NULL) Line 2651  if (extra_data != NULL)
2651    if ((flags & PCRE_EXTRA_TABLES) != 0)    if ((flags & PCRE_EXTRA_TABLES) != 0)
2652      md->tables = extra_data->tables;      md->tables = extra_data->tables;
2653    }    }
2654    
2655  /* Check that the first field in the block is the magic number. If it is not,  /* Check that the first field in the block is the magic number. If it is not,
2656  test for a regex that was compiled on a host of opposite endianness. If this is  test for a regex that was compiled on a host of opposite endianness. If this is
2657  the case, flipped values are put in internal_re and internal_study if there was  the case, flipped values are put in internal_re and internal_study if there was
# Line 2592  md->start_code = (const uschar *)argumen Line 2685  md->start_code = (const uschar *)argumen
2685      re->name_table_offset + re->name_count * re->name_entry_size;      re->name_table_offset + re->name_count * re->name_entry_size;
2686  md->start_subject = (const unsigned char *)subject;  md->start_subject = (const unsigned char *)subject;
2687  md->end_subject = end_subject;  md->end_subject = end_subject;
2688    md->start_offset = start_offset;
2689  md->moptions = options;  md->moptions = options;
2690  md->poptions = re->options;  md->poptions = re->options;
2691    
# Line 2614  switch ((((options & PCRE_NEWLINE_BITS) Line 2708  switch ((((options & PCRE_NEWLINE_BITS)
2708           PCRE_NEWLINE_BITS)           PCRE_NEWLINE_BITS)
2709    {    {
2710    case 0: newline = NEWLINE; break;   /* Compile-time default */    case 0: newline = NEWLINE; break;   /* Compile-time default */
2711    case PCRE_NEWLINE_CR: newline = '\r'; break;    case PCRE_NEWLINE_CR: newline = CHAR_CR; break;
2712    case PCRE_NEWLINE_LF: newline = '\n'; break;    case PCRE_NEWLINE_LF: newline = CHAR_NL; break;
2713    case PCRE_NEWLINE_CR+    case PCRE_NEWLINE_CR+
2714         PCRE_NEWLINE_LF: newline = ('\r' << 8) | '\n'; break;         PCRE_NEWLINE_LF: newline = (CHAR_CR << 8) | CHAR_NL; break;
2715    case PCRE_NEWLINE_ANY: newline = -1; break;    case PCRE_NEWLINE_ANY: newline = -1; break;
2716    case PCRE_NEWLINE_ANYCRLF: newline = -2; break;    case PCRE_NEWLINE_ANYCRLF: newline = -2; break;
2717    default: return PCRE_ERROR_BADNEWLINE;    default: return PCRE_ERROR_BADNEWLINE;
# Line 2696  if (!anchored) Line 2790  if (!anchored)
2790      }      }
2791    else    else
2792      {      {
2793      if (startline && study != NULL &&      if (!startline && study != NULL &&
2794           (study->options & PCRE_STUDY_MAPPED) != 0)           (study->flags & PCRE_STUDY_MAPPED) != 0)
2795        start_bits = study->start_bits;        start_bits = study->start_bits;
2796      }      }
2797    }    }
# Line 2713  if ((re->flags & PCRE_REQCHSET) != 0) Line 2807  if ((re->flags & PCRE_REQCHSET) != 0)
2807    }    }
2808    
2809  /* Call the main matching function, looping for a non-anchored regex after a  /* Call the main matching function, looping for a non-anchored regex after a
2810  failed match. Unless restarting, optimize by moving to the first match  failed match. If not restarting, perform certain optimizations at the start of
2811  character if possible, when not anchored. Then unless wanting a partial match,  a match. */
 check for a required later character. */  
2812    
2813  for (;;)  for (;;)
2814    {    {
# Line 2725  for (;;) Line 2818  for (;;)
2818      {      {
2819      const uschar *save_end_subject = end_subject;      const uschar *save_end_subject = end_subject;
2820    
2821      /* Advance to a unique first char if possible. If firstline is TRUE, the      /* If firstline is TRUE, the start of the match is constrained to the first
2822      start of the match is constrained to the first line of a multiline string.      line of a multiline string. Implement this by temporarily adjusting
2823      Implement this by temporarily adjusting end_subject so that we stop      end_subject so that we stop scanning at a newline. If the match fails at
2824      scanning at a newline. If the match fails at the newline, later code breaks      the newline, later code breaks this loop. */
     this loop. */  
2825    
2826      if (firstline)      if (firstline)
2827        {        {
2828        const uschar *t = current_subject;        USPTR t = current_subject;
2829    #ifdef SUPPORT_UTF8
2830          if (utf8)
2831            {
2832            while (t < md->end_subject && !IS_NEWLINE(t))
2833              {
2834              t++;
2835              while (t < end_subject && (*t & 0xc0) == 0x80) t++;
2836              }
2837            }
2838          else
2839    #endif
2840        while (t < md->end_subject && !IS_NEWLINE(t)) t++;        while (t < md->end_subject && !IS_NEWLINE(t)) t++;
2841        end_subject = t;        end_subject = t;
2842        }        }
2843    
2844      if (first_byte >= 0)      /* There are some optimizations that avoid running the match if a known
2845        {      starting point is not found. However, there is an option that disables
2846        if (first_byte_caseless)      these, for testing and for ensuring that all callouts do actually occur. */
         while (current_subject < end_subject &&  
                lcc[*current_subject] != first_byte)  
           current_subject++;  
       else  
         while (current_subject < end_subject && *current_subject != first_byte)  
           current_subject++;  
       }  
2847    
2848      /* Or to just after a linebreak for a multiline match if possible */      if ((options & PCRE_NO_START_OPTIMIZE) == 0)
   
     else if (startline)  
2849        {        {
2850        if (current_subject > md->start_subject + start_offset)        /* Advance to a known first byte. */
         {  
         while (current_subject < end_subject && !WAS_NEWLINE(current_subject))  
           current_subject++;  
2851    
2852          /* If we have just passed a CR and the newline option is ANY or        if (first_byte >= 0)
         ANYCRLF, and we are now at a LF, advance the match position by one more  
         character. */  
   
         if (current_subject[-1] == '\r' &&  
              (md->nltype == NLTYPE_ANY || md->nltype == NLTYPE_ANYCRLF) &&  
              current_subject < end_subject &&  
              *current_subject == '\n')  
           current_subject++;  
         }  
       }  
   
     /* Or to a non-unique first char after study */  
   
     else if (start_bits != NULL)  
       {  
       while (current_subject < end_subject)  
2853          {          {
2854          register unsigned int c = *current_subject;          if (first_byte_caseless)
2855          if ((start_bits[c/8] & (1 << (c&7))) == 0) current_subject++;            while (current_subject < end_subject &&
2856            else break;                   lcc[*current_subject] != first_byte)
2857                current_subject++;
2858            else
2859              while (current_subject < end_subject &&
2860                     *current_subject != first_byte)
2861                current_subject++;
2862          }          }
       }  
   
     /* Restore fudged end_subject */  
2863    
2864      end_subject = save_end_subject;        /* Or to just after a linebreak for a multiline match if possible */
     }  
   
   /* If req_byte is set, we know that that character must appear in the subject  
   for the match to succeed. If the first character is set, req_byte must be  
   later in the subject; otherwise the test starts at the match point. This  
   optimization can save a huge amount of work in patterns with nested unlimited  
   repeats that aren't going to match. Writing separate code for cased/caseless  
   versions makes it go faster, as does using an autoincrement and backing off  
   on a match.  
   
   HOWEVER: when the subject string is very, very long, searching to its end can  
   take a long time, and give bad performance on quite ordinary patterns. This  
   showed up when somebody was matching /^C/ on a 32-megabyte string... so we  
   don't do this when the string is sufficiently long.  
   
   ALSO: this processing is disabled when partial matching is requested.  
   */  
   
   if (req_byte >= 0 &&  
       end_subject - current_subject < REQ_BYTE_MAX &&  
       (options & PCRE_PARTIAL) == 0)  
     {  
     register const uschar *p = current_subject + ((first_byte >= 0)? 1 : 0);  
2865    
2866      /* We don't need to repeat the search if we haven't yet reached the        else if (startline)
     place we found it at last time. */  
   
     if (p > req_byte_ptr)  
       {  
       if (req_byte_caseless)  
2867          {          {
2868          while (p < end_subject)          if (current_subject > md->start_subject + start_offset)
2869            {            {
2870            register int pp = *p++;  #ifdef SUPPORT_UTF8
2871            if (pp == req_byte || pp == req_byte2) { p--; break; }            if (utf8)
2872                {
2873                while (current_subject < end_subject &&
2874                       !WAS_NEWLINE(current_subject))
2875                  {
2876                  current_subject++;
2877                  while(current_subject < end_subject &&
2878                        (*current_subject & 0xc0) == 0x80)
2879                    current_subject++;
2880                  }
2881                }
2882              else
2883    #endif
2884              while (current_subject < end_subject && !WAS_NEWLINE(current_subject))
2885                current_subject++;
2886    
2887              /* If we have just passed a CR and the newline option is ANY or
2888              ANYCRLF, and we are now at a LF, advance the match position by one
2889              more character. */
2890    
2891              if (current_subject[-1] == CHAR_CR &&
2892                   (md->nltype == NLTYPE_ANY || md->nltype == NLTYPE_ANYCRLF) &&
2893                   current_subject < end_subject &&
2894                   *current_subject == CHAR_NL)
2895                current_subject++;
2896            }            }
2897          }          }
2898        else  
2899          /* Or to a non-unique first char after study */
2900    
2901          else if (start_bits != NULL)
2902          {          {
2903          while (p < end_subject)          while (current_subject < end_subject)
2904            {            {
2905            if (*p++ == req_byte) { p--; break; }            register unsigned int c = *current_subject;
2906              if ((start_bits[c/8] & (1 << (c&7))) == 0) current_subject++;
2907                else break;
2908            }            }
2909          }          }
2910          }
2911    
2912        /* If we can't find the required character, break the matching loop,      /* Restore fudged end_subject */
       which will cause a return or PCRE_ERROR_NOMATCH. */  
   
       if (p >= end_subject) break;  
2913    
2914        /* If we have found the required character, save the point where we      end_subject = save_end_subject;
       found it, so that we don't search again next time round the loop if  
       the start hasn't passed this character yet. */  
2915    
2916        req_byte_ptr = p;      /* The following two optimizations are disabled for partial matching or if
2917        disabling is explicitly requested (and of course, by the test above, this
2918        code is not obeyed when restarting after a partial match). */
2919    
2920        if ((options & PCRE_NO_START_OPTIMIZE) == 0 &&
2921            (options & (PCRE_PARTIAL_HARD|PCRE_PARTIAL_SOFT)) == 0)
2922          {
2923          /* If the pattern was studied, a minimum subject length may be set. This
2924          is a lower bound; no actual string of that length may actually match the
2925          pattern. Although the value is, strictly, in characters, we treat it as
2926          bytes to avoid spending too much time in this optimization. */
2927    
2928          if (study != NULL && (study->flags & PCRE_STUDY_MINLEN) != 0 &&
2929              end_subject - current_subject < study->minlength)
2930            return PCRE_ERROR_NOMATCH;
2931    
2932          /* If req_byte is set, we know that that character must appear in the
2933          subject for the match to succeed. If the first character is set, req_byte
2934          must be later in the subject; otherwise the test starts at the match
2935          point. This optimization can save a huge amount of work in patterns with
2936          nested unlimited repeats that aren't going to match. Writing separate
2937          code for cased/caseless versions makes it go faster, as does using an
2938          autoincrement and backing off on a match.
2939    
2940          HOWEVER: when the subject string is very, very long, searching to its end
2941          can take a long time, and give bad performance on quite ordinary
2942          patterns. This showed up when somebody was matching /^C/ on a 32-megabyte
2943          string... so we don't do this when the string is sufficiently long. */
2944    
2945          if (req_byte >= 0 && end_subject - current_subject < REQ_BYTE_MAX)
2946            {
2947            register const uschar *p = current_subject + ((first_byte >= 0)? 1 : 0);
2948    
2949            /* We don't need to repeat the search if we haven't yet reached the
2950            place we found it at last time. */
2951    
2952            if (p > req_byte_ptr)
2953              {
2954              if (req_byte_caseless)
2955                {
2956                while (p < end_subject)
2957                  {
2958                  register int pp = *p++;
2959                  if (pp == req_byte || pp == req_byte2) { p--; break; }
2960                  }
2961                }
2962              else
2963                {
2964                while (p < end_subject)
2965                  {
2966                  if (*p++ == req_byte) { p--; break; }
2967                  }
2968                }
2969    
2970              /* If we can't find the required character, break the matching loop,
2971              which will cause a return or PCRE_ERROR_NOMATCH. */
2972    
2973              if (p >= end_subject) break;
2974    
2975              /* If we have found the required character, save the point where we
2976              found it, so that we don't search again next time round the loop if
2977              the start hasn't passed this character yet. */
2978    
2979              req_byte_ptr = p;
2980              }
2981            }
2982        }        }
2983      }      }   /* End of optimizations that are done when not restarting */
2984    
2985    /* OK, now we can do the business */    /* OK, now we can do the business */
2986    
2987      md->start_used_ptr = current_subject;
2988    
2989    rc = internal_dfa_exec(    rc = internal_dfa_exec(
2990      md,                                /* fixed match data */      md,                                /* fixed match data */
2991      md->start_code,                    /* this subexpression's code */      md->start_code,                    /* this subexpression's code */
# Line 2879  for (;;) Line 3020  for (;;)
3020    not contain any explicit matches for \r or \n, and the newline option is CRLF    not contain any explicit matches for \r or \n, and the newline option is CRLF
3021    or ANY or ANYCRLF, advance the match position by one more character. */    or ANY or ANYCRLF, advance the match position by one more character. */
3022    
3023    if (current_subject[-1] == '\r' &&    if (current_subject[-1] == CHAR_CR &&
3024        current_subject < end_subject &&        current_subject < end_subject &&
3025        *current_subject == '\n' &&        *current_subject == CHAR_NL &&
3026        (re->flags & PCRE_HASCRORLF) == 0 &&        (re->flags & PCRE_HASCRORLF) == 0 &&
3027          (md->nltype == NLTYPE_ANY ||          (md->nltype == NLTYPE_ANY ||
3028           md->nltype == NLTYPE_ANYCRLF ||           md->nltype == NLTYPE_ANYCRLF ||

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