/[pcre]/code/trunk/pcre.c

Diff of /code/trunk/pcre.c

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-revision 23 by nigel,
Sat Feb 24 21:38:41 2007 UTC
+revision 35 by nigel,
Sat Feb 24 21:39:05 2007 UTC
 Line 9 
 the file Tech.Notes for some information
  Written by: Philip Hazel <ph10@cam.ac.uk>
-            Copyright (c) 1998 University of Cambridge
+            Copyright (c) 1997-1999 University of Cambridge
  -----------------------------------------------------------------------------
  Permission is granted to anyone to use this software for any purpose on any
 Line 25 
 restrictions:
 . Altered versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
+. If PCRE is embedded in any software that is released under the GNU
+    General Purpose Licence (GPL), then the terms of that licence shall
+    supersede any condition above with which it is incompatible.
  -----------------------------------------------------------------------------
  */
-Line 107 
 static const short int escapes[] = {
+Line 111 
 static const short int escapes[] = {
  static BOOL
    compile_regex(int, int, int *, uschar **, const uschar **, const char **,
-     BOOL, int);
+     BOOL, int, compile_data *);
- /* Structure for passing "static" information around between the functions
- doing the matching, so that they are thread-safe. */
- typedef struct match_data {
-   int    errorcode;             /* As it says */
-   int   *offset_vector;         /* Offset vector */
-   int    offset_end;            /* One past the end */
-   int    offset_max;            /* The maximum usable for return data */
-   BOOL   offset_overflow;       /* Set if too many extractions */
-   BOOL   notbol;                /* NOTBOL flag */
-   BOOL   noteol;                /* NOTEOL flag */
-   BOOL   endonly;               /* Dollar not before final \n */
-   const uschar *start_subject;  /* Start of the subject string */
-   const uschar *end_subject;    /* End of the subject string */
-   const uschar *end_match_ptr;  /* Subject position at end match */
-   int     end_offset_top;       /* Highwater mark at end of match */
- } match_data;
-Line 145 
 void  (*pcre_free)(void *) = free;
+Line 131 
 void  (*pcre_free)(void *) = free;
  /*************************************************
+ *             Default character tables           *
+ *************************************************/
+ /* A default set of character tables is included in the PCRE binary. Its source
+ is built by the maketables auxiliary program, which uses the default C ctypes
+ functions, and put in the file chartables.c. These tables are used by PCRE
+ whenever the caller of pcre_compile() does not provide an alternate set of
+ tables. */
+ #include "chartables.c"
+ /*************************************************
  *          Return version string                 *
  *************************************************/
 Line 237 
 Arguments:
    bracount   number of previous extracting brackets
    options    the options bits
    isclass    TRUE if inside a character class
+   cd         pointer to char tables block
  Returns:     zero or positive => a data character
               negative => a special escape sequence
-Line 245 
 Returns:     zero or positive => a data
+Line 246 
 Returns:     zero or positive => a data
  static int
  check_escape(const uschar **ptrptr, const char **errorptr, int bracount,
-   int options, BOOL isclass)
+   int options, BOOL isclass, compile_data *cd)
  {
  const uschar *ptr = *ptrptr;
  int c = *(++ptr) & 255;   /* Ensure > 0 on signed-char systems */
-Line 288 
 else
+Line 289 
 else
        {
        oldptr = ptr;
        c -= '0';
-       while ((pcre_ctypes[ptr[1]] & ctype_digit) != 0)
+       while ((cd->ctypes[ptr[1]] & ctype_digit) != 0)
          c = c * 10 + *(++ptr) - '0';
        if (c < 10 || c <= bracount)
          {
-Line 314 
 else
+Line 315 
 else
      case '0':
      c -= '0';
-     while(i++ < 2 && (pcre_ctypes[ptr[1]] & ctype_digit) != 0 &&
+     while(i++ < 2 && (cd->ctypes[ptr[1]] & ctype_digit) != 0 &&
        ptr[1] != '8' && ptr[1] != '9')
          c = c * 8 + *(++ptr) - '0';
      break;
-Line 323 
 else
+Line 324 
 else
      case 'x':
      c = 0;
-     while (i++ < 2 && (pcre_ctypes[ptr[1]] & ctype_xdigit) != 0)
+     while (i++ < 2 && (cd->ctypes[ptr[1]] & ctype_xdigit) != 0)
        {
        ptr++;
-       c = c * 16 + pcre_lcc[*ptr] -
+       c = c * 16 + cd->lcc[*ptr] -
-         (((pcre_ctypes[*ptr] & ctype_digit) != 0)? '0' : 'W');
+         (((cd->ctypes[*ptr] & ctype_digit) != 0)? '0' : 'W');
        }
      break;
-Line 341 
 else
+Line 342 
 else
      /* A letter is upper-cased; then the 0x40 bit is flipped */
-     if (c >= 'a' && c <= 'z') c = pcre_fcc[c];
+     if (c >= 'a' && c <= 'z') c = cd->fcc[c];
      c ^= 0x40;
      break;
      /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any
      other alphameric following \ is an error if PCRE_EXTRA was set; otherwise,
-     for Perl compatibility, it is a literal. */
+     for Perl compatibility, it is a literal. This code looks a bit odd, but
+     there used to be some cases other than the default, and there may be again
+     in future, so I haven't "optimized" it. */
      default:
      if ((options & PCRE_EXTRA) != 0) switch(c)
-Line 377 
 where the ddds are digits.
+Line 380 
 where the ddds are digits.
  Arguments:
    p         pointer to the first char after '{'
+   cd        pointer to char tables block
  Returns:    TRUE or FALSE
  */
  static BOOL
- is_counted_repeat(const uschar *p)
+ is_counted_repeat(const uschar *p, compile_data *cd)
  {
- if ((pcre_ctypes[*p++] & ctype_digit) == 0) return FALSE;
+ if ((cd->ctypes[*p++] & ctype_digit) == 0) return FALSE;
- while ((pcre_ctypes[*p] & ctype_digit) != 0) p++;
+ while ((cd->ctypes[*p] & ctype_digit) != 0) p++;
  if (*p == '}') return TRUE;
  if (*p++ != ',') return FALSE;
  if (*p == '}') return TRUE;
- if ((pcre_ctypes[*p++] & ctype_digit) == 0) return FALSE;
+ if ((cd->ctypes[*p++] & ctype_digit) == 0) return FALSE;
- while ((pcre_ctypes[*p] & ctype_digit) != 0) p++;
+ while ((cd->ctypes[*p] & ctype_digit) != 0) p++;
  return (*p == '}');
  }
-Line 412 
 Arguments:
+Line 416 
 Arguments:
    maxp       pointer to int for max
               returned as -1 if no max
    errorptr   points to pointer to error message
+   cd         pointer to character tables clock
  Returns:     pointer to '}' on success;
               current ptr on error, with errorptr set
  */
  static const uschar *
- read_repeat_counts(const uschar *p, int *minp, int *maxp, const char **errorptr)
+ read_repeat_counts(const uschar *p, int *minp, int *maxp,
+   const char **errorptr, compile_data *cd)
  {
  int min = 0;
  int max = -1;
- while ((pcre_ctypes[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0';
+ while ((cd->ctypes[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0';
  if (*p == '}') max = min; else
    {
    if (*(++p) != '}')
      {
      max = 0;
-     while((pcre_ctypes[*p] & ctype_digit) != 0) max = max * 10 + *p++ - '0';
+     while((cd->ctypes[*p] & ctype_digit) != 0) max = max * 10 + *p++ - '0';
      if (max < min)
        {
        *errorptr = ERR4;
-Line 615 
 for (;;)
+Line 621 
 for (;;)
  /* Scan the pattern, compiling it into the code vector.
  Arguments:
-   options     the option bits
+   options      the option bits
-   brackets    points to number of brackets used
+   brackets     points to number of brackets used
-   code        points to the pointer to the current code point
+   code         points to the pointer to the current code point
-   ptrptr      points to the current pattern pointer
+   ptrptr       points to the current pattern pointer
-   errorptr    points to pointer to error message
+   errorptr     points to pointer to error message
-   optchanged  set to the value of the last OP_OPT item compiled
+   optchanged   set to the value of the last OP_OPT item compiled
+   cd           contains pointers to tables
- Returns:      TRUE on success
+ Returns:       TRUE on success
-               FALSE, with *errorptr set on error
+                FALSE, with *errorptr set on error
  */
  static BOOL
  compile_branch(int options, int *brackets, uschar **codeptr,
-   const uschar **ptrptr, const char **errorptr, int *optchanged)
+   const uschar **ptrptr, const char **errorptr, int *optchanged,
+   compile_data *cd)
  {
  int repeat_type, op_type;
  int repeat_min, repeat_max;
-Line 660 
 for (;; ptr++)
+Line 668 
 for (;; ptr++)
    c = *ptr;
    if ((options & PCRE_EXTENDED) != 0)
      {
-     if ((pcre_ctypes[c] & ctype_space) != 0) continue;
+     if ((cd->ctypes[c] & ctype_space) != 0) continue;
      if (c == '#')
        {
        while ((c = *(++ptr)) != 0 && c != '\n');
-Line 748 
 for (;; ptr++)
+Line 756 
 for (;; ptr++)
        if (c == '\\')
          {
-         c = check_escape(&ptr, errorptr, *brackets, options, TRUE);
+         c = check_escape(&ptr, errorptr, *brackets, options, TRUE, cd);
          if (-c == ESC_b) c = '\b';
          else if (c < 0)
            {
+           register const uschar *cbits = cd->cbits;
            class_charcount = 10;
            switch (-c)
              {
              case ESC_d:
-             for (c = 0; c < 32; c++) class[c] |= pcre_cbits[c+cbit_digit];
+             for (c = 0; c < 32; c++) class[c] |= cbits[c+cbit_digit];
              continue;
              case ESC_D:
-             for (c = 0; c < 32; c++) class[c] |= ~pcre_cbits[c+cbit_digit];
+             for (c = 0; c < 32; c++) class[c] |= ~cbits[c+cbit_digit];
              continue;
              case ESC_w:
              for (c = 0; c < 32; c++)
-               class[c] |= (pcre_cbits[c] | pcre_cbits[c+cbit_word]);
+               class[c] |= (cbits[c+cbit_digit] | cbits[c+cbit_word]);
              continue;
              case ESC_W:
              for (c = 0; c < 32; c++)
-               class[c] |= ~(pcre_cbits[c] | pcre_cbits[c+cbit_word]);
+               class[c] |= ~(cbits[c+cbit_digit] | cbits[c+cbit_word]);
              continue;
              case ESC_s:
-             for (c = 0; c < 32; c++) class[c] |= pcre_cbits[c+cbit_space];
+             for (c = 0; c < 32; c++) class[c] |= cbits[c+cbit_space];
              continue;
              case ESC_S:
-             for (c = 0; c < 32; c++) class[c] |= ~pcre_cbits[c+cbit_space];
+             for (c = 0; c < 32; c++) class[c] |= ~cbits[c+cbit_space];
              continue;
              default:
-Line 810 
 for (;; ptr++)
+Line 819 
 for (;; ptr++)
          if (d == '\\')
            {
-           d = check_escape(&ptr, errorptr, *brackets, options, TRUE);
+           d = check_escape(&ptr, errorptr, *brackets, options, TRUE, cd);
            if (d < 0)
              {
              if (d == -ESC_b) d = '\b'; else
-Line 832 
 for (;; ptr++)
+Line 841 
 for (;; ptr++)
            class[c/8] |= (1 << (c&7));
            if ((options & PCRE_CASELESS) != 0)
              {
-             int uc = pcre_fcc[c];           /* flip case */
+             int uc = cd->fcc[c];           /* flip case */
              class[uc/8] |= (1 << (uc&7));
              }
            class_charcount++;                /* in case a one-char range */
-Line 847 
 for (;; ptr++)
+Line 856 
 for (;; ptr++)
        class [c/8] |= (1 << (c&7));
        if ((options & PCRE_CASELESS) != 0)
          {
-         c = pcre_fcc[c];   /* flip case */
+         c = cd->fcc[c];   /* flip case */
          class[c/8] |= (1 << (c&7));
          }
        class_charcount++;
-Line 894 
 for (;; ptr++)
+Line 903 
 for (;; ptr++)
      /* Various kinds of repeat */
      case '{':
-     if (!is_counted_repeat(ptr+1)) goto NORMAL_CHAR;
+     if (!is_counted_repeat(ptr+1, cd)) goto NORMAL_CHAR;
-     ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorptr);
+     ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorptr, cd);
      if (*errorptr != NULL) goto FAILED;
      goto REPEAT;
-Line 1082 
 for (;; ptr++)
+Line 1091 
 for (;; ptr++)
      else if ((int)*previous >= OP_BRA || (int)*previous == OP_ONCE ||
               (int)*previous == OP_COND)
        {
-       int i, ketoffset = 0;
+       register int i;
+       int ketoffset = 0;
        int len = code - previous;
+       uschar *bralink = NULL;
        /* If the maximum repeat count is unlimited, find the end of the bracket
        by scanning through from the start, and compute the offset back to it
-Line 1098 
 for (;; ptr++)
+Line 1109 
 for (;; ptr++)
          ketoffset = code - ket;
          }
+       /* The case of a zero minimum is special because of the need to stick
+       OP_BRAZERO in front of it, and because the group appears once in the
+       data, whereas in other cases it appears the minimum number of times. For
+       this reason, it is simplest to treat this case separately, as otherwise
+       the code gets far too mess. There are several special subcases when the
+       minimum is zero. */
+       if (repeat_min == 0)
+         {
+         /* If the maximum is also zero, we just omit the group from the output
+         altogether. */
+         if (repeat_max == 0)
+           {
+           code = previous;
+           previous = NULL;
+           break;
+           }
+         /* If the maximum is 1 or unlimited, we just have to stick in the
+         BRAZERO and do no more at this point. */
+         if (repeat_max <= 1)
+           {
+           memmove(previous+1, previous, len);
+           code++;
+           *previous++ = OP_BRAZERO + repeat_type;
+           }
+         /* If the maximum is greater than 1 and limited, we have to replicate
+         in a nested fashion, sticking OP_BRAZERO before each set of brackets.
+         The first one has to be handled carefully because it's the original
+         copy, which has to be moved up. The remainder can be handled by code
+         that is common with the non-zero minimum case below. We just have to
+         adjust the value or repeat_max, since one less copy is required. */
+         else
+           {
+           int offset;
+           memmove(previous+4, previous, len);
+           code += 4;
+           *previous++ = OP_BRAZERO + repeat_type;
+           *previous++ = OP_BRA;
+           /* We chain together the bracket offset fields that have to be
+           filled in later when the ends of the brackets are reached. */
+           offset = (bralink == NULL)? 0 : previous - bralink;
+           bralink = previous;
+           *previous++ = offset >> 8;
+           *previous++ = offset & 255;
+           }
+         repeat_max--;
+         }
+       /* If the minimum is greater than zero, replicate the group as many
+       times as necessary, and adjust the maximum to the number of subsequent
+       copies that we need. */
+       else
+         {
+         for (i = 1; i < repeat_min; i++)
+           {
+           memcpy(code, previous, len);
+           code += len;
+           }
+         if (repeat_max > 0) repeat_max -= repeat_min;
+         }
+       /* This code is common to both the zero and non-zero minimum cases. If
+       the maximum is limited, it replicates the group in a nested fashion,
+       remembering the bracket starts on a stack. In the case of a zero minimum,
+       the first one was set up above. In all cases the repeat_max now specifies
+       the number of additional copies needed. */
+       if (repeat_max >= 0)
+         {
+         for (i = repeat_max - 1; i >= 0; i--)
+           {
+           *code++ = OP_BRAZERO + repeat_type;
+           /* All but the final copy start a new nesting, maintaining the
+           chain of brackets outstanding. */
+           if (i != 0)
+             {
+             int offset;
+             *code++ = OP_BRA;
+             offset = (bralink == NULL)? 0 : code - bralink;
+             bralink = code;
+             *code++ = offset >> 8;
+             *code++ = offset & 255;
+             }
+           memcpy(code, previous, len);
+           code += len;
+           }
+         /* Now chain through the pending brackets, and fill in their length
+         fields (which are holding the chain links pro tem). */
+         while (bralink != NULL)
+           {
+           int oldlinkoffset;
+           int offset = code - bralink + 1;
+           uschar *bra = code - offset;
+           oldlinkoffset = (bra[1] << 8) + bra[2];
+           bralink = (oldlinkoffset == 0)? NULL : bralink - oldlinkoffset;
+           *code++ = OP_KET;
+           *code++ = bra[1] = offset >> 8;
+           *code++ = bra[2] = (offset & 255);
+           }
+         }
+       /* If the maximum is unlimited, set a repeater in the final copy. We
+       can't just offset backwards from the current code point, because we
+       don't know if there's been an options resetting after the ket. The
+       correct offset was computed above. */
+       else code[-ketoffset] = OP_KETRMAX + repeat_type;
+ #ifdef NEVER
        /* If the minimum is greater than zero, and the maximum is unlimited or
        equal to the minimum, the first copy remains where it is, and is
        replicated up to the minimum number of times. This case includes the +
-Line 1145 
 for (;; ptr++)
+Line 1280 
 for (;; ptr++)
        correct offset was computed above. */
        if (repeat_max == -1) code[-ketoffset] = OP_KETRMAX + repeat_type;
+ #endif
        }
      /* Else there's some kind of shambles */
-Line 1191 
 for (;; ptr++)
+Line 1329 
 for (;; ptr++)
          case '(':
          bravalue = OP_COND;       /* Conditional group */
-         if ((pcre_ctypes[*(++ptr)] & ctype_digit) != 0)
+         if ((cd->ctypes[*(++ptr)] & ctype_digit) != 0)
            {
            condref = *ptr - '0';
            while (*(++ptr) != ')') condref = condref*10 + *ptr - '0';
-Line 1324 
 for (;; ptr++)
+Line 1462 
 for (;; ptr++)
           errorptr,                     /* Where to put an error message */
           (bravalue == OP_ASSERTBACK ||
            bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */
-          condref))                     /* Condition reference number */
+          condref,                      /* Condition reference number */
+          cd))                          /* Tables block */
        goto FAILED;
      /* At the end of compiling, code is still pointing to the start of the
-Line 1372 
 for (;; ptr++)
+Line 1511 
 for (;; ptr++)
      case '\\':
      tempptr = ptr;
-     c = check_escape(&ptr, errorptr, *brackets, options, FALSE);
+     c = check_escape(&ptr, errorptr, *brackets, options, FALSE, cd);
      /* Handle metacharacters introduced by \. For ones like \d, the ESC_ values
      are arranged to be the negation of the corresponding OP_values. For the
-Line 1417 
 for (;; ptr++)
+Line 1556 
 for (;; ptr++)
        {
        if ((options & PCRE_EXTENDED) != 0)
          {
-         if ((pcre_ctypes[c] & ctype_space) != 0) continue;
+         if ((cd->ctypes[c] & ctype_space) != 0) continue;
          if (c == '#')
            {
            while ((c = *(++ptr)) != 0 && c != '\n');
-Line 1433 
 for (;; ptr++)
+Line 1572 
 for (;; ptr++)
        if (c == '\\')
          {
          tempptr = ptr;
-         c = check_escape(&ptr, errorptr, *brackets, options, FALSE);
+         c = check_escape(&ptr, errorptr, *brackets, options, FALSE, cd);
          if (c < 0) { ptr = tempptr; break; }
          }
-Line 1445 
 for (;; ptr++)
+Line 1584 
 for (;; ptr++)
      /* This "while" is the end of the "do" above. */
-     while (length < 255 && (pcre_ctypes[c = *(++ptr)] & ctype_meta) == 0);
+     while (length < 255 && (cd->ctypes[c = *(++ptr)] & ctype_meta) == 0);
      /* Compute the length and set it in the data vector, and advance to
      the next state. */
-Line 1490 
 Argument:
+Line 1629 
 Argument:
    errorptr    -> pointer to error message
    lookbehind  TRUE if this is a lookbehind assertion
    condref     > 0 for OPT_CREF setting at start of conditional group
+   cd          points to the data block with tables pointers
  Returns:      TRUE on success
  */
  static BOOL
  compile_regex(int options, int optchanged, int *brackets, uschar **codeptr,
-   const uschar **ptrptr, const char **errorptr, BOOL lookbehind, int condref)
+   const uschar **ptrptr, const char **errorptr, BOOL lookbehind, int condref,
+   compile_data *cd)
  {
  const uschar *ptr = *ptrptr;
  uschar *code = *codeptr;
-Line 1543 
 for (;;)
+Line 1684 
 for (;;)
    /* Now compile the branch */
-   if (!compile_branch(options, brackets, &code, &ptr, errorptr, &optchanged))
+   if (!compile_branch(options,brackets,&code,&ptr,errorptr,&optchanged,cd))
      {
      *ptrptr = ptr;
      return FALSE;
-Line 1649 
 for (;;)
+Line 1790 
 for (;;)
      code += 2;
      break;
+     case OP_WORD_BOUNDARY:
+     case OP_NOT_WORD_BOUNDARY:
+     code++;
+     break;
      case OP_ASSERT_NOT:
      case OP_ASSERTBACK:
      case OP_ASSERTBACK_NOT:
-Line 1676 
 all of whose alternatives start with OP_
+Line 1822 
 all of whose alternatives start with OP_
  it's anchored. However, if this is a multiline pattern, then only OP_SOD
  counts, since OP_CIRC can match in the middle.
- A branch is also implicitly anchored if it starts with .* because that will try
+ A branch is also implicitly anchored if it starts with .* and DOTALL is set,
- the rest of the pattern at all possible matching points, so there is no point
+ because that will try the rest of the pattern at all possible matching points,
- trying them again.
+ so there is no point trying them again.
  Arguments:
    code       points to start of expression (the bracket)
-Line 1696 
 do {
+Line 1842 
 do {
     register int op = *scode;
     if (op >= OP_BRA || op == OP_ASSERT || op == OP_ONCE || op == OP_COND)
       { if (!is_anchored(scode, options)) return FALSE; }
-    else if (op == OP_TYPESTAR || op == OP_TYPEMINSTAR)
+    else if ((op == OP_TYPESTAR || op == OP_TYPEMINSTAR) &&
+             (*options & PCRE_DOTALL) != 0)
       { if (scode[1] != OP_ANY) return FALSE; }
     else if (op != OP_SOD &&
             ((*options & PCRE_MULTILINE) != 0 || op != OP_CIRC))
-Line 1710 
 return TRUE;
+Line 1857 
 return TRUE;
  /*************************************************
- *     Check for start with \n line expression    *
+ *         Check for starting with ^ or .*        *
  *************************************************/
- /* This is called for multiline expressions to try to find out if every branch
+ /* This is called to find out if every branch starts with ^ or .* so that
- starts with ^ so that "first char" processing can be done to speed things up.
+ "first char" processing can be done to speed things up in multiline
+ matching and for non-DOTALL patterns that start with .* (which must start at
+ the beginning or after \n).
  Argument:  points to start of expression (the bracket)
  Returns:   TRUE or FALSE
-Line 1728 
 do {
+Line 1877 
 do {
     register int op = *scode;
     if (op >= OP_BRA || op == OP_ASSERT || op == OP_ONCE || op == OP_COND)
       { if (!is_startline(scode)) return FALSE; }
+    else if (op == OP_TYPESTAR || op == OP_TYPEMINSTAR)
+      { if (scode[1] != OP_ANY) return FALSE; }
     else if (op != OP_CIRC) return FALSE;
     code += (code[1] << 8) + code[2];
     }
-Line 1813 
 Arguments:
+Line 1964 
 Arguments:
    options      various option bits
    errorptr     pointer to pointer to error text
    erroroffset  ptr offset in pattern where error was detected
+   tables       pointer to character tables or NULL
  Returns:       pointer to compiled data block, or NULL on error,
                 with errorptr and erroroffset set
-Line 1820 
 Returns:       pointer to compiled data
+Line 1972 
 Returns:       pointer to compiled data
  pcre *
  pcre_compile(const char *pattern, int options, const char **errorptr,
-   int *erroroffset)
+   int *erroroffset, const unsigned char *tables)
  {
  real_pcre *re;
  int length = 3;      /* For initial BRA plus length */
-Line 1833 
 int branch_newextra;
+Line 1985 
 int branch_newextra;
  unsigned int brastackptr = 0;
  uschar *code;
  const uschar *ptr;
+ compile_data compile_block;
  int brastack[BRASTACK_SIZE];
  uschar bralenstack[BRASTACK_SIZE];
-Line 1861 
 if ((options & ~PUBLIC_OPTIONS) != 0)
+Line 2014 
 if ((options & ~PUBLIC_OPTIONS) != 0)
    return NULL;
    }
+ /* Set up pointers to the individual character tables */
+ if (tables == NULL) tables = pcre_default_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;
+ /* Reflect pattern for debugging output */
  DPRINTF(("------------------------------------------------------------------\n"));
  DPRINTF(("%s\n", pattern));
-Line 1879 
 while ((c = *(++ptr)) != 0)
+Line 2042 
 while ((c = *(++ptr)) != 0)
    if ((options & PCRE_EXTENDED) != 0)
      {
-     if ((pcre_ctypes[c] & ctype_space) != 0) continue;
+     if ((compile_block.ctypes[c] & ctype_space) != 0) continue;
      if (c == '#')
        {
        while ((c = *(++ptr)) != 0 && c != '\n');
-Line 1897 
 while ((c = *(++ptr)) != 0)
+Line 2060 
 while ((c = *(++ptr)) != 0)
      case '\\':
        {
        const uschar *save_ptr = ptr;
-       c = check_escape(&ptr, errorptr, bracount, options, FALSE);
+       c = check_escape(&ptr, errorptr, bracount, options, FALSE, &compile_block);
        if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
        if (c >= 0)
          {
-Line 1917 
 while ((c = *(++ptr)) != 0)
+Line 2080 
 while ((c = *(++ptr)) != 0)
        int refnum = -c - ESC_REF;
        if (refnum > top_backref) top_backref = refnum;
        length++;   /* For single back reference */
-       if (ptr[1] == '{' && is_counted_repeat(ptr+2))
+       if (ptr[1] == '{' && is_counted_repeat(ptr+2, &compile_block))
          {
-         ptr = read_repeat_counts(ptr+2, &min, &max, errorptr);
+         ptr = read_repeat_counts(ptr+2, &min, &max, errorptr, &compile_block);
          if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
          if ((min == 0 && (max == 1 || max == -1)) ||
            (min == 1 && max == -1))
-Line 1943 
 while ((c = *(++ptr)) != 0)
+Line 2106 
 while ((c = *(++ptr)) != 0)
      or back reference. */
      case '{':
-     if (!is_counted_repeat(ptr+1)) goto NORMAL_CHAR;
+     if (!is_counted_repeat(ptr+1, &compile_block)) goto NORMAL_CHAR;
-     ptr = read_repeat_counts(ptr+1, &min, &max, errorptr);
+     ptr = read_repeat_counts(ptr+1, &min, &max, errorptr, &compile_block);
      if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
      if ((min == 0 && (max == 1 || max == -1)) ||
        (min == 1 && max == -1))
-Line 1979 
 while ((c = *(++ptr)) != 0)
+Line 2142 
 while ((c = *(++ptr)) != 0)
        {
        if (*ptr == '\\')
          {
-         int ch = check_escape(&ptr, errorptr, bracount, options, TRUE);
+         int ch = check_escape(&ptr, errorptr, bracount, options, TRUE,
+           &compile_block);
          if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
          if (-ch == ESC_b) class_charcount++; else class_charcount = 10;
          }
-Line 1996 
 while ((c = *(++ptr)) != 0)
+Line 2160 
 while ((c = *(++ptr)) != 0)
        /* A repeat needs either 1 or 5 bytes. */
-       if (*ptr != 0 && ptr[1] == '{' && is_counted_repeat(ptr+2))
+       if (*ptr != 0 && ptr[1] == '{' && is_counted_repeat(ptr+2, &compile_block))
          {
-         ptr = read_repeat_counts(ptr+2, &min, &max, errorptr);
+         ptr = read_repeat_counts(ptr+2, &min, &max, errorptr, &compile_block);
          if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
          if ((min == 0 && (max == 1 || max == -1)) ||
            (min == 1 && max == -1))
-Line 2064 
 while ((c = *(++ptr)) != 0)
+Line 2228 
 while ((c = *(++ptr)) != 0)
          group. */
          case '(':
-         if ((pcre_ctypes[ptr[3]] & ctype_digit) != 0)
+         if ((compile_block.ctypes[ptr[3]] & ctype_digit) != 0)
            {
            ptr += 4;
            length += 2;
-           while ((pcre_ctypes[*ptr] & ctype_digit) != 0) ptr++;
+           while ((compile_block.ctypes[*ptr] & ctype_digit) != 0) ptr++;
            if (*ptr != ')')
              {
              *errorptr = ERR26;
-Line 2237 
 while ((c = *(++ptr)) != 0)
+Line 2401 
 while ((c = *(++ptr)) != 0)
        /* Leave ptr at the final char; for read_repeat_counts this happens
        automatically; for the others we need an increment. */
-       if ((c = ptr[1]) == '{' && is_counted_repeat(ptr+2))
+       if ((c = ptr[1]) == '{' && is_counted_repeat(ptr+2, &compile_block))
          {
-         ptr = read_repeat_counts(ptr+2, &minval, &maxval, errorptr);
+         ptr = read_repeat_counts(ptr+2, &minval, &maxval, errorptr,
+           &compile_block);
          if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
          }
        else if (c == '*') { minval = 0; maxval = -1; ptr++; }
        else if (c == '+') { maxval = -1; ptr++; }
        else if (c == '?') { minval = 0; ptr++; }
-       /* If there is a minimum > 1 we have to replicate up to minval-1 times;
+       /* If the minimum is zero, we have to allow for an OP_BRAZERO before the
-       if there is a limited maximum we have to replicate up to maxval-1 times
+       group, and if the maximum is greater than zero, we have to replicate
-       and allow for a BRAZERO item before each optional copy, as we also have
+       maxval-1 times; each replication acquires an OP_BRAZERO plus a nesting
-       to do before the first copy if the minimum is zero. */
+       bracket set - hence the 7. */
-       if (minval == 0) length++;
+       if (minval == 0)
-         else if (minval > 1) length += (minval - 1) * duplength;
+         {
-       if (maxval > minval) length += (maxval - minval) * (duplength + 1);
+         length++;
+         if (maxval > 0) length += (maxval - 1) * (duplength + 7);
+         }
+       /* When the minimum is greater than zero, 1 we have to replicate up to
+       minval-1 times, with no additions required in the copies. Then, if
+       there is a limited maximum we have to replicate up to maxval-1 times
+       allowing for a BRAZERO item before each optional copy and nesting
+       brackets for all but one of the optional copies. */
+       else
+         {
+         length += (minval - 1) * duplength;
+         if (maxval > minval)   /* Need this test as maxval=-1 means no limit */
+           length += (maxval - minval) * (duplength + 7) - 6;
+         }
        }
      continue;
-Line 2270 
 while ((c = *(++ptr)) != 0)
+Line 2450 
 while ((c = *(++ptr)) != 0)
        {
        if ((options & PCRE_EXTENDED) != 0)
          {
-         if ((pcre_ctypes[c] & ctype_space) != 0) continue;
+         if ((compile_block.ctypes[c] & ctype_space) != 0) continue;
          if (c == '#')
            {
            while ((c = *(++ptr)) != 0 && c != '\n');
-Line 2284 
 while ((c = *(++ptr)) != 0)
+Line 2464 
 while ((c = *(++ptr)) != 0)
        if (c == '\\')
          {
          const uschar *saveptr = ptr;
-         c = check_escape(&ptr, errorptr, bracount, options, FALSE);
+         c = check_escape(&ptr, errorptr, bracount, options, FALSE,
+           &compile_block);
          if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
          if (c < 0) { ptr = saveptr; break; }
          }
-Line 2296 
 while ((c = *(++ptr)) != 0)
+Line 2477 
 while ((c = *(++ptr)) != 0)
      /* This "while" is the end of the "do" above. */
-     while (runlength < 255 && (pcre_ctypes[c = *(++ptr)] & ctype_meta) == 0);
+     while (runlength < 255 &&
+       (compile_block.ctypes[c = *(++ptr)] & ctype_meta) == 0);
      ptr--;
      length += runlength;
-Line 2331 
 if (re == NULL)
+Line 2513 
 if (re == NULL)
  re->magic_number = MAGIC_NUMBER;
  re->options = options;
+ re->tables = tables;
  /* Set up a starting, non-extracting bracket, then compile the expression. On
  error, *errorptr will be set non-NULL, so we don't need to look at the result
-Line 2340 
 ptr = (const uschar *)pattern;
+Line 2523 
 ptr = (const uschar *)pattern;
  code = re->code;
  *code = OP_BRA;
  bracount = 0;
- (void)compile_regex(options, -1, &bracount, &code, &ptr, errorptr, FALSE, -1);
+ (void)compile_regex(options, -1, &bracount, &code, &ptr, errorptr, FALSE, -1,
+   &compile_block);
  re->top_bracket = bracount;
  re->top_backref = top_backref;
-Line 2372 
 if (*errorptr != NULL)
+Line 2556 
 if (*errorptr != NULL)
    return NULL;
    }
- /* If the anchored option was not passed, set flag if we can determine that it
+ /* If the anchored option was not passed, set flag if we can determine that the
- is anchored by virtue of ^ characters or \A or anything else. Otherwise, see if
+ pattern is anchored by virtue of ^ characters or \A or anything else (such as
- we can determine what the first character has to be, because that speeds up
+ starting with .* when DOTALL is set).
- unanchored matches no end. In the case of multiline matches, an alternative is
- to set the PCRE_STARTLINE flag if all branches start with ^. */
+ Otherwise, see if we can determine what the first character has to be, because
+ that speeds up unanchored matches no end. If not, see if we can set the
+ PCRE_STARTLINE flag. This is helpful for multiline matches when all branches
+ start with ^. and also when all branches start with .* for non-DOTALL matches.
+ */
  if ((options & PCRE_ANCHORED) == 0)
    {
-Line 2637 
 return (pcre *)re;
+Line 2825 
 return (pcre *)re;
  /*************************************************
- *        Match a character type                  *
- *************************************************/
- /* Not used in all the places it might be as it's sometimes faster
- to put the code inline.
- Arguments:
-   type        the character type
-   c           the character
-   dotall      the dotall flag
- Returns:      TRUE if character is of the type
- */
- static BOOL
- match_type(int type, int c, BOOL dotall)
- {
- #ifdef DEBUG
- if (isprint(c)) printf("matching subject %c against ", c);
-   else printf("matching subject \\x%02x against ", c);
- printf("%s\n", OP_names[type]);
- #endif
- switch(type)
-   {
-   case OP_ANY:            return dotall || c != '\n';
-   case OP_NOT_DIGIT:      return (pcre_ctypes[c] & ctype_digit) == 0;
-   case OP_DIGIT:          return (pcre_ctypes[c] & ctype_digit) != 0;
-   case OP_NOT_WHITESPACE: return (pcre_ctypes[c] & ctype_space) == 0;
-   case OP_WHITESPACE:     return (pcre_ctypes[c] & ctype_space) != 0;
-   case OP_NOT_WORDCHAR:   return (pcre_ctypes[c] & ctype_word) == 0;
-   case OP_WORDCHAR:       return (pcre_ctypes[c] & ctype_word) != 0;
-   }
- return FALSE;
- }
- /*************************************************
  *          Match a back-reference                *
  *************************************************/
-Line 2719 
 if (length > md->end_subject - eptr) ret
+Line 2867 
 if (length > md->end_subject - eptr) ret
  /* Separate the caselesss case for speed */
  if ((ims & PCRE_CASELESS) != 0)
-   { while (length-- > 0) if (pcre_lcc[*p++] != pcre_lcc[*eptr++]) return FALSE; }
+   {
+   while (length-- > 0)
+     if (md->lcc[*p++] != md->lcc[*eptr++]) return FALSE;
+   }
  else
    { while (length-- > 0) if (*p++ != *eptr++) return FALSE; }
-Line 2782 
 for (;;)
+Line 2933 
 for (;;)
      int number = op - OP_BRA;
      int offset = number << 1;
-     DPRINTF(("start bracket %d\n", number));
+ #ifdef DEBUG
+     printf("start bracket %d subject=", number);
+     pchars(eptr, 16, TRUE, md);
+     printf("\n");
+ #endif
      if (offset < md->offset_max)
        {
-Line 3172 
 for (;;)
+Line 3327 
 for (;;)
      case OP_WORD_BOUNDARY:
        {
        BOOL prev_is_word = (eptr != md->start_subject) &&
-         ((pcre_ctypes[eptr[-1]] & ctype_word) != 0);
+         ((md->ctypes[eptr[-1]] & ctype_word) != 0);
        BOOL cur_is_word = (eptr < md->end_subject) &&
-         ((pcre_ctypes[*eptr] & ctype_word) != 0);
+         ((md->ctypes[*eptr] & ctype_word) != 0);
        if ((*ecode++ == OP_WORD_BOUNDARY)?
             cur_is_word == prev_is_word : cur_is_word != prev_is_word)
          return FALSE;
-Line 3191 
 for (;;)
+Line 3346 
 for (;;)
      break;
      case OP_NOT_DIGIT:
-     if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_digit) != 0)
+     if (eptr >= md->end_subject ||
+        (md->ctypes[*eptr++] & ctype_digit) != 0)
        return FALSE;
      ecode++;
      break;
      case OP_DIGIT:
-     if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_digit) == 0)
+     if (eptr >= md->end_subject ||
+        (md->ctypes[*eptr++] & ctype_digit) == 0)
        return FALSE;
      ecode++;
      break;
      case OP_NOT_WHITESPACE:
-     if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_space) != 0)
+     if (eptr >= md->end_subject ||
+        (md->ctypes[*eptr++] & ctype_space) != 0)
        return FALSE;
      ecode++;
      break;
      case OP_WHITESPACE:
-     if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_space) == 0)
+     if (eptr >= md->end_subject ||
+        (md->ctypes[*eptr++] & ctype_space) == 0)
        return FALSE;
      ecode++;
      break;
      case OP_NOT_WORDCHAR:
-     if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_word) != 0)
+     if (eptr >= md->end_subject ||
+        (md->ctypes[*eptr++] & ctype_word) != 0)
        return FALSE;
      ecode++;
      break;
      case OP_WORDCHAR:
-     if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_word) == 0)
+     if (eptr >= md->end_subject ||
+        (md->ctypes[*eptr++] & ctype_word) == 0)
        return FALSE;
      ecode++;
      break;
-Line 3453 
 for (;;)
+Line 3614 
 for (;;)
        if (length > md->end_subject - eptr) return FALSE;
        if ((ims & PCRE_CASELESS) != 0)
          {
-         while (length-- > 0) if (pcre_lcc[*ecode++] != pcre_lcc[*eptr++]) return FALSE;
+         while (length-- > 0)
+           if (md->lcc[*ecode++] != md->lcc[*eptr++])
+             return FALSE;
          }
        else
          {
-Line 3510 
 for (;;)
+Line 3673 
 for (;;)
      if ((ims & PCRE_CASELESS) != 0)
        {
-       c = pcre_lcc[c];
+       c = md->lcc[c];
-       for (i = 1; i <= min; i++) if (c != pcre_lcc[*eptr++]) return FALSE;
+       for (i = 1; i <= min; i++)
+         if (c != md->lcc[*eptr++]) return FALSE;
        if (min == max) continue;
        if (minimize)
          {
-Line 3519 
 for (;;)
+Line 3683 
 for (;;)
            {
            if (match(eptr, ecode, offset_top, md, ims, FALSE, eptrb))
              return TRUE;
-           if (i >= max || eptr >= md->end_subject || c != pcre_lcc[*eptr++])
+           if (i >= max || eptr >= md->end_subject ||
+               c != md->lcc[*eptr++])
              return FALSE;
            }
          /* Control never gets here */
-Line 3529 
 for (;;)
+Line 3694 
 for (;;)
          const uschar *pp = eptr;
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || c != pcre_lcc[*eptr]) break;
+           if (eptr >= md->end_subject || c != md->lcc[*eptr]) break;
            eptr++;
            }
          while (eptr >= pp)
-Line 3579 
 for (;;)
+Line 3744 
 for (;;)
      ecode++;
      if ((ims & PCRE_CASELESS) != 0)
        {
-       if (pcre_lcc[*ecode++] == pcre_lcc[*eptr++]) return FALSE;
+       if (md->lcc[*ecode++] == md->lcc[*eptr++]) return FALSE;
        }
      else
        {
-Line 3639 
 for (;;)
+Line 3804 
 for (;;)
      if ((ims & PCRE_CASELESS) != 0)
        {
-       c = pcre_lcc[c];
+       c = md->lcc[c];
-       for (i = 1; i <= min; i++) if (c == pcre_lcc[*eptr++]) return FALSE;
+       for (i = 1; i <= min; i++)
+         if (c == md->lcc[*eptr++]) return FALSE;
        if (min == max) continue;
        if (minimize)
          {
-Line 3648 
 for (;;)
+Line 3814 
 for (;;)
            {
            if (match(eptr, ecode, offset_top, md, ims, FALSE, eptrb))
              return TRUE;
-           if (i >= max || eptr >= md->end_subject || c == pcre_lcc[*eptr++])
+           if (i >= max || eptr >= md->end_subject ||
+               c == md->lcc[*eptr++])
              return FALSE;
            }
          /* Control never gets here */
-Line 3658 
 for (;;)
+Line 3825 
 for (;;)
          const uschar *pp = eptr;
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || c == pcre_lcc[*eptr]) break;
+           if (eptr >= md->end_subject || c == md->lcc[*eptr]) break;
            eptr++;
            }
          while (eptr >= pp)
-Line 3752 
 for (;;)
+Line 3919 
 for (;;)
        case OP_NOT_DIGIT:
        for (i = 1; i <= min; i++)
-         if ((pcre_ctypes[*eptr++] & ctype_digit) != 0) return FALSE;
+         if ((md->ctypes[*eptr++] & ctype_digit) != 0) return FALSE;
        break;
        case OP_DIGIT:
        for (i = 1; i <= min; i++)
-         if ((pcre_ctypes[*eptr++] & ctype_digit) == 0) return FALSE;
+         if ((md->ctypes[*eptr++] & ctype_digit) == 0) return FALSE;
        break;
        case OP_NOT_WHITESPACE:
        for (i = 1; i <= min; i++)
-         if ((pcre_ctypes[*eptr++] & ctype_space) != 0) return FALSE;
+         if ((md->ctypes[*eptr++] & ctype_space) != 0) return FALSE;
        break;
        case OP_WHITESPACE:
        for (i = 1; i <= min; i++)
-         if ((pcre_ctypes[*eptr++] & ctype_space) == 0) return FALSE;
+         if ((md->ctypes[*eptr++] & ctype_space) == 0) return FALSE;
        break;
        case OP_NOT_WORDCHAR:
-       for (i = 1; i <= min; i++) if ((pcre_ctypes[*eptr++] & ctype_word) != 0)
+       for (i = 1; i <= min; i++)
-         return FALSE;
+         if ((md->ctypes[*eptr++] & ctype_word) != 0)
+           return FALSE;
        break;
        case OP_WORDCHAR:
-       for (i = 1; i <= min; i++) if ((pcre_ctypes[*eptr++] & ctype_word) == 0)
+       for (i = 1; i <= min; i++)
-         return FALSE;
+         if ((md->ctypes[*eptr++] & ctype_word) == 0)
+           return FALSE;
        break;
        }
-Line 3786 
 for (;;)
+Line 3955 
 for (;;)
      if (min == max) continue;
      /* If minimizing, we have to test the rest of the pattern before each
-     subsequent match, so inlining isn't much help; just use the function. */
+     subsequent match. */
      if (minimize)
        {
        for (i = min;; i++)
          {
          if (match(eptr, ecode, offset_top, md, ims, FALSE, eptrb)) return TRUE;
-         if (i >= max || eptr >= md->end_subject ||
+         if (i >= max || eptr >= md->end_subject) return FALSE;
-           !match_type(ctype, *eptr++, (ims & PCRE_DOTALL) != 0))
-             return FALSE;
+         c = *eptr++;
+         switch(ctype)
+           {
+           case OP_ANY:
+           if ((ims & PCRE_DOTALL) == 0 && c == '\n') return FALSE;
+           break;
+           case OP_NOT_DIGIT:
+           if ((md->ctypes[c] & ctype_digit) != 0) return FALSE;
+           break;
+           case OP_DIGIT:
+           if ((md->ctypes[c] & ctype_digit) == 0) return FALSE;
+           break;
+           case OP_NOT_WHITESPACE:
+           if ((md->ctypes[c] & ctype_space) != 0) return FALSE;
+           break;
+           case OP_WHITESPACE:
+           if  ((md->ctypes[c] & ctype_space) == 0) return FALSE;
+           break;
+           case OP_NOT_WORDCHAR:
+           if ((md->ctypes[c] & ctype_word) != 0) return FALSE;
+           break;
+           case OP_WORDCHAR:
+           if ((md->ctypes[c] & ctype_word) == 0) return FALSE;
+           break;
+           }
          }
        /* Control never gets here */
        }
-Line 3828 
 for (;;)
+Line 4027 
 for (;;)
          case OP_NOT_DIGIT:
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_digit) != 0)
+           if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) != 0)
              break;
            eptr++;
            }
-Line 3837 
 for (;;)
+Line 4036 
 for (;;)
          case OP_DIGIT:
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_digit) == 0)
+           if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_digit) == 0)
              break;
            eptr++;
            }
-Line 3846 
 for (;;)
+Line 4045 
 for (;;)
          case OP_NOT_WHITESPACE:
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_space) != 0)
+           if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) != 0)
              break;
            eptr++;
            }
-Line 3855 
 for (;;)
+Line 4054 
 for (;;)
          case OP_WHITESPACE:
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_space) == 0)
+           if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_space) == 0)
              break;
            eptr++;
            }
-Line 3864 
 for (;;)
+Line 4063 
 for (;;)
          case OP_NOT_WORDCHAR:
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_word) != 0)
+           if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) != 0)
              break;
            eptr++;
            }
-Line 3873 
 for (;;)
+Line 4072 
 for (;;)
          case OP_WORDCHAR:
          for (i = min; i < max; i++)
            {
-           if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_word) == 0)
+           if (eptr >= md->end_subject || (md->ctypes[*eptr] & ctype_word) == 0)
              break;
            eptr++;
            }
-Line 3919 
 Arguments:
+Line 4118 
 Arguments:
    external_extra  points to "hints" from pcre_study() or is NULL
    subject         points to the subject string
    length          length of subject string (may contain binary zeros)
+   start_offset    where to start in the subject string
    options         option bits
    offsets         points to a vector of ints to be filled in with offsets
    offsetcount     the number of elements in the vector
-Line 3931 
 Returns:          > 0 => success; value
+Line 4131 
 Returns:          > 0 => success; value
  int
  pcre_exec(const pcre *external_re, const pcre_extra *external_extra,
-   const char *subject, int length, int options, int *offsets, int offsetcount)
+   const char *subject, int length, int start_offset, int options, int *offsets,
+   int offsetcount)
  {
  int resetcount, ocount;
  int first_char = -1;
  int ims = 0;
  match_data match_block;
  const uschar *start_bits = NULL;
- const uschar *start_match = (const uschar *)subject;
+ const uschar *start_match = (const uschar *)subject + start_offset;
  const uschar *end_subject;
  const real_pcre *re = (const real_pcre *)external_re;
  const real_pcre_extra *extra = (const real_pcre_extra *)external_extra;
-Line 3963 
 match_block.noteol = (options & PCRE_NOT
+Line 4164 
 match_block.noteol = (options & PCRE_NOT
  match_block.errorcode = PCRE_ERROR_NOMATCH;     /* Default error */
+ match_block.lcc = re->tables + lcc_offset;
+ match_block.ctypes = re->tables + ctypes_offset;
  /* The ims options can vary during the matching as a result of the presence
  of (?ims) items in the pattern. They are kept in a local variable so that
  restoring at the exit of a group is easy. */
-Line 3997 
 in the pattern. */
+Line 4201 
 in the pattern. */
  resetcount = 2 + re->top_bracket * 2;
  if (resetcount > offsetcount) resetcount = ocount;
+ /* Reset the working variable associated with each extraction. These should
+ never be used unless previously set, but they get saved and restored, and so we
+ initialize them to avoid reading uninitialized locations. */
+ if (match_block.offset_vector != NULL)
+   {
+   register int *iptr = match_block.offset_vector + ocount;
+   register int *iend = iptr - resetcount/2 + 1;
+   while (--iptr >= iend) *iptr = -1;
+   }
  /* Set up the first character to match, if available. The first_char value is
  never set for an anchored regular expression, but the anchoring may be forced
  at run time, so we have to test for anchoring. The first char may be unset for
-Line 4008 
 if (!anchored)
+Line 4223 
 if (!anchored)
    if ((re->options & PCRE_FIRSTSET) != 0)
      {
      first_char = re->first_char;
-     if ((ims & PCRE_CASELESS) != 0) first_char = pcre_lcc[first_char];
+     if ((ims & PCRE_CASELESS) != 0) first_char = match_block.lcc[first_char];
      }
    else
      if (!startline && extra != NULL &&
-Line 4016 
 if (!anchored)
+Line 4231 
 if (!anchored)
          start_bits = extra->start_bits;
    }
- /* Loop for unanchored matches; for anchored regexps the loop runs just once. */
+ /* Loop for unanchored matches; for anchored regexs the loop runs just once. */
  do
    {
-Line 4033 
 do
+Line 4248 
 do
    if (first_char >= 0)
      {
      if ((ims & PCRE_CASELESS) != 0)
-       while (start_match < end_subject && pcre_lcc[*start_match] != first_char)
+       while (start_match < end_subject &&
+              match_block.lcc[*start_match] != first_char)
          start_match++;
      else
        while (start_match < end_subject && *start_match != first_char)
-Line 4106 
 do
+Line 4322 
 do
    DPRINTF((">>>> returning %d\n", rc));
    return rc;
    }
+ /* This "while" is the end of the "do" above */
  while (!anchored &&
         match_block.errorcode == PCRE_ERROR_NOMATCH &&
         start_match++ < end_subject);

 Legend:



Removed from v.23
 


changed lines


 
Added in v.35
 Legend:



Removed from v.23
 


changed lines


 
Added in v.35
-Removed from v.23
+Added in v.35

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