/[pcre]/code/trunk/pcre_compile.c
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revision 640 by ph10, Mon Jul 25 10:50:28 2011 UTC revision 702 by ph10, Tue Sep 20 15:45:06 2011 UTC
# Line 409  static const char error_texts[] = Line 409  static const char error_texts[] =
409    "(*MARK) must have an argument\0"    "(*MARK) must have an argument\0"
410    "this version of PCRE is not compiled with PCRE_UCP support\0"    "this version of PCRE is not compiled with PCRE_UCP support\0"
411    "\\c must be followed by an ASCII character\0"    "\\c must be followed by an ASCII character\0"
412    "\\k is not followed by a braced, angle-bracketed, or quoted name\0"    "\\k is not followed by a braced, angle-bracketed, or quoted name\0"
413    ;    ;
414    
415  /* Table to identify digits and hex digits. This is used when compiling  /* Table to identify digits and hex digits. This is used when compiling
# Line 546  static const unsigned char ebcdic_charta Line 546  static const unsigned char ebcdic_charta
546  /* Definition to allow mutual recursion */  /* Definition to allow mutual recursion */
547    
548  static BOOL  static BOOL
549    compile_regex(int, uschar **, const uschar **, int *, BOOL, BOOL, int, int *,    compile_regex(int, uschar **, const uschar **, int *, BOOL, BOOL, int, int,
550      int *, branch_chain *, compile_data *, int *);      int *, int *, branch_chain *, compile_data *, int *);
551    
552    
553    
# Line 681  else Line 681  else
681      *errorcodeptr = ERR37;      *errorcodeptr = ERR37;
682      break;      break;
683    
684      /* In a character class, \g is just a literal "g". Outside a character      /* In a character class, \g is just a literal "g". Outside a character
685      class, \g must be followed by one of a number of specific things:      class, \g must be followed by one of a number of specific things:
686    
687      (1) A number, either plain or braced. If positive, it is an absolute      (1) A number, either plain or braced. If positive, it is an absolute
# Line 921  else Line 921  else
921    }    }
922    
923  /* Perl supports \N{name} for character names, as well as plain \N for "not  /* Perl supports \N{name} for character names, as well as plain \N for "not
924  newline". PCRE does not support \N{name}. However, it does support  newline". PCRE does not support \N{name}. However, it does support
925  quantification such as \N{2,3}. */  quantification such as \N{2,3}. */
926    
927  if (c == -ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&  if (c == -ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&
# Line 1982  for (code = first_significant_code(code Line 1982  for (code = first_significant_code(code
1982    /* For a recursion/subroutine call, if its end has been reached, which    /* For a recursion/subroutine call, if its end has been reached, which
1983    implies a backward reference subroutine call, we can scan it. If it's a    implies a backward reference subroutine call, we can scan it. If it's a
1984    forward reference subroutine call, we can't. To detect forward reference    forward reference subroutine call, we can't. To detect forward reference
1985    we have to scan up the list that is kept in the workspace. This function is    we have to scan up the list that is kept in the workspace. This function is
1986    called only when doing the real compile, not during the pre-compile that    called only when doing the real compile, not during the pre-compile that
1987    measures the size of the compiled pattern. */    measures the size of the compiled pattern. */
1988    
1989    if (c == OP_RECURSE)    if (c == OP_RECURSE)
1990      {      {
1991      const uschar *scode;      const uschar *scode;
1992      BOOL empty_branch;      BOOL empty_branch;
1993    
1994      /* Test for forward reference */      /* Test for forward reference */
1995    
1996      for (scode = cd->start_workspace; scode < cd->hwm; scode += LINK_SIZE)      for (scode = cd->start_workspace; scode < cd->hwm; scode += LINK_SIZE)
1997        if (GET(scode, 0) == code + 1 - cd->start_code) return TRUE;        if (GET(scode, 0) == code + 1 - cd->start_code) return TRUE;
1998    
1999      /* Not a forward reference, test for completed backward reference */      /* Not a forward reference, test for completed backward reference */
2000    
2001      empty_branch = FALSE;      empty_branch = FALSE;
2002      scode = cd->start_code + GET(code, 1);      scode = cd->start_code + GET(code, 1);
2003      if (GET(scode, 1) == 0) return TRUE;    /* Unclosed */      if (GET(scode, 1) == 0) return TRUE;    /* Unclosed */
2004    
2005      /* Completed backwards reference */      /* Completed backwards reference */
2006    
2007      do      do
2008        {        {
2009        if (could_be_empty_branch(scode, endcode, utf8, cd))        if (could_be_empty_branch(scode, endcode, utf8, cd))
# Line 2014  for (code = first_significant_code(code Line 2014  for (code = first_significant_code(code
2014        scode += GET(scode, 1);        scode += GET(scode, 1);
2015        }        }
2016      while (*scode == OP_ALT);      while (*scode == OP_ALT);
2017    
2018      if (!empty_branch) return FALSE;  /* All branches are non-empty */      if (!empty_branch) return FALSE;  /* All branches are non-empty */
2019      continue;      continue;
2020      }      }
# Line 2240  return TRUE; Line 2240  return TRUE;
2240  the current branch of the current pattern to see if it could match the empty  the current branch of the current pattern to see if it could match the empty
2241  string. If it could, we must look outwards for branches at other levels,  string. If it could, we must look outwards for branches at other levels,
2242  stopping when we pass beyond the bracket which is the subject of the recursion.  stopping when we pass beyond the bracket which is the subject of the recursion.
2243  This function is called only during the real compile, not during the  This function is called only during the real compile, not during the
2244  pre-compile.  pre-compile.
2245    
2246  Arguments:  Arguments:
# Line 2295  I think. Line 2295  I think.
2295  A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.  A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
2296  It seems that the appearance of a nested POSIX class supersedes an apparent  It seems that the appearance of a nested POSIX class supersedes an apparent
2297  external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or  external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
2298  a digit. Also, unescaped square brackets may also appear as part of class  a digit.
2299  names. For example, [:a[:abc]b:] gives unknown class "[:abc]b:]"in Perl.  
2300    In Perl, unescaped square brackets may also appear as part of class names. For
2301    example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
2302    [:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
2303    seem right at all. PCRE does not allow closing square brackets in POSIX class
2304    names.
2305    
2306  Arguments:  Arguments:
2307    ptr      pointer to the initial [    ptr      pointer to the initial [
# Line 2312  int terminator;          /* Don't combin Line 2317  int terminator;          /* Don't combin
2317  terminator = *(++ptr);   /* compiler warns about "non-constant" initializer. */  terminator = *(++ptr);   /* compiler warns about "non-constant" initializer. */
2318  for (++ptr; *ptr != 0; ptr++)  for (++ptr; *ptr != 0; ptr++)
2319    {    {
2320    if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)    if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2321      ptr++;      ptr++;
2322      else if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;
2323    else    else
2324      {      {
2325      if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)      if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
# Line 2325  for (++ptr; *ptr != 0; ptr++) Line 2331  for (++ptr; *ptr != 0; ptr++)
2331           (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||           (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
2332            ptr[1] == CHAR_EQUALS_SIGN) &&            ptr[1] == CHAR_EQUALS_SIGN) &&
2333          check_posix_syntax(ptr, endptr))          check_posix_syntax(ptr, endptr))
2334        return FALSE;        return FALSE;
2335      }      }
2336    }    }
2337  return FALSE;  return FALSE;
# Line 3035  Arguments: Line 3041  Arguments:
3041    firstbyteptr   set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)    firstbyteptr   set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)
3042    reqbyteptr     set to the last literal character required, else < 0    reqbyteptr     set to the last literal character required, else < 0
3043    bcptr          points to current branch chain    bcptr          points to current branch chain
3044      cond_depth     conditional nesting depth
3045    cd             contains pointers to tables etc.    cd             contains pointers to tables etc.
3046    lengthptr      NULL during the real compile phase    lengthptr      NULL during the real compile phase
3047                   points to length accumulator during pre-compile phase                   points to length accumulator during pre-compile phase
# Line 3046  Returns:         TRUE on success Line 3053  Returns:         TRUE on success
3053  static BOOL  static BOOL
3054  compile_branch(int *optionsptr, uschar **codeptr, const uschar **ptrptr,  compile_branch(int *optionsptr, uschar **codeptr, const uschar **ptrptr,
3055    int *errorcodeptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,    int *errorcodeptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,
3056    compile_data *cd, int *lengthptr)    int cond_depth, compile_data *cd, int *lengthptr)
3057  {  {
3058  int repeat_type, op_type;  int repeat_type, op_type;
3059  int repeat_min = 0, repeat_max = 0;      /* To please picky compilers */  int repeat_min = 0, repeat_max = 0;      /* To please picky compilers */
# Line 3074  uschar *save_hwm = NULL; Line 3081  uschar *save_hwm = NULL;
3081  uschar classbits[32];  uschar classbits[32];
3082    
3083  /* We can fish out the UTF-8 setting once and for all into a BOOL, but we  /* We can fish out the UTF-8 setting once and for all into a BOOL, but we
3084  must not do this for other options (e.g. PCRE_EXTENDED) because they may change  must not do this for other options (e.g. PCRE_EXTENDED) because they may change
3085  dynamically as we process the pattern. */  dynamically as we process the pattern. */
3086    
3087  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 3085  uschar *class_utf8data_base; Line 3092  uschar *class_utf8data_base;
3092  uschar utf8_char[6];  uschar utf8_char[6];
3093  #else  #else
3094  BOOL utf8 = FALSE;  BOOL utf8 = FALSE;
 uschar *utf8_char = NULL;  
3095  #endif  #endif
3096    
3097  #ifdef PCRE_DEBUG  #ifdef PCRE_DEBUG
# Line 4249  for (;; ptr++) Line 4255  for (;; ptr++)
4255        ptr++;        ptr++;
4256        }        }
4257      else repeat_type = greedy_default;      else repeat_type = greedy_default;
4258    
4259      /* If previous was a recursion call, wrap it in atomic brackets so that      /* If previous was a recursion call, wrap it in atomic brackets so that
4260      previous becomes the atomic group. All recursions were so wrapped in the      previous becomes the atomic group. All recursions were so wrapped in the
4261      past, but it no longer happens for non-repeated recursions. In fact, the      past, but it no longer happens for non-repeated recursions. In fact, the
4262      repeated ones could be re-implemented independently so as not to need this,      repeated ones could be re-implemented independently so as not to need this,
4263      but for the moment we rely on the code for repeating groups. */      but for the moment we rely on the code for repeating groups. */
4264    
4265      if (*previous == OP_RECURSE)      if (*previous == OP_RECURSE)
4266        {        {
4267        memmove(previous + 1 + LINK_SIZE, previous, 1 + LINK_SIZE);        memmove(previous + 1 + LINK_SIZE, previous, 1 + LINK_SIZE);
# Line 4265  for (;; ptr++) Line 4271  for (;; ptr++)
4271        PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE);        PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE);
4272        code += 2 + 2 * LINK_SIZE;        code += 2 + 2 * LINK_SIZE;
4273        length_prevgroup = 3 + 3*LINK_SIZE;        length_prevgroup = 3 + 3*LINK_SIZE;
4274    
4275        /* When actually compiling, we need to check whether this was a forward        /* When actually compiling, we need to check whether this was a forward
4276        reference, and if so, adjust the offset. */        reference, and if so, adjust the offset. */
4277    
4278        if (lengthptr == NULL && cd->hwm >= cd->start_workspace + LINK_SIZE)        if (lengthptr == NULL && cd->hwm >= cd->start_workspace + LINK_SIZE)
4279          {          {
4280          int offset = GET(cd->hwm, -LINK_SIZE);          int offset = GET(cd->hwm, -LINK_SIZE);
4281          if (offset == previous + 1 - cd->start_code)          if (offset == previous + 1 - cd->start_code)
4282            PUT(cd->hwm, -LINK_SIZE, offset + 1 + LINK_SIZE);            PUT(cd->hwm, -LINK_SIZE, offset + 1 + LINK_SIZE);
4283          }          }
4284        }        }
4285    
4286      /* Now handle repetition for the different types of item. */      /* Now handle repetition for the different types of item. */
4287    
4288      /* If previous was a character match, abolish the item and generate a      /* If previous was a character match, abolish the item and generate a
# Line 4574  for (;; ptr++) Line 4580  for (;; ptr++)
4580      opcodes such as BRA and CBRA, as this is the place where they get converted      opcodes such as BRA and CBRA, as this is the place where they get converted
4581      into the more special varieties such as BRAPOS and SBRA. A test for >=      into the more special varieties such as BRAPOS and SBRA. A test for >=
4582      OP_ASSERT and <= OP_COND includes ASSERT, ASSERT_NOT, ASSERTBACK,      OP_ASSERT and <= OP_COND includes ASSERT, ASSERT_NOT, ASSERTBACK,
4583      ASSERTBACK_NOT, ONCE, BRA, CBRA, and COND. Originally, PCRE did not allow      ASSERTBACK_NOT, ONCE, BRA, CBRA, and COND. Originally, PCRE did not allow
4584      repetition of assertions, but now it does, for Perl compatibility. */      repetition of assertions, but now it does, for Perl compatibility. */
4585    
4586      else if (*previous >= OP_ASSERT && *previous <= OP_COND)      else if (*previous >= OP_ASSERT && *previous <= OP_COND)
4587        {        {
4588        register int i;        register int i;
4589        int len = (int)(code - previous);        int len = (int)(code - previous);
4590        uschar *bralink = NULL;        uschar *bralink = NULL;
4591        uschar *brazeroptr = NULL;        uschar *brazeroptr = NULL;
4592    
4593        /* Repeating a DEFINE group is pointless, but Perl allows the syntax, so        /* Repeating a DEFINE group is pointless, but Perl allows the syntax, so
4594        we just ignore the repeat. */        we just ignore the repeat. */
4595    
4596        if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)        if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)
4597          goto END_REPEAT;          goto END_REPEAT;
4598    
4599        /* There is no sense in actually repeating assertions. The only potential        /* There is no sense in actually repeating assertions. The only potential
4600        use of repetition is in cases when the assertion is optional. Therefore,        use of repetition is in cases when the assertion is optional. Therefore,
4601        if the minimum is greater than zero, just ignore the repeat. If the        if the minimum is greater than zero, just ignore the repeat. If the
4602        maximum is not not zero or one, set it to 1. */        maximum is not not zero or one, set it to 1. */
4603    
4604        if (*previous < OP_ONCE)    /* Assertion */        if (*previous < OP_ONCE)    /* Assertion */
4605          {          {
4606          if (repeat_min > 0) goto END_REPEAT;          if (repeat_min > 0) goto END_REPEAT;
4607          if (repeat_max < 0 || repeat_max > 1) repeat_max = 1;          if (repeat_max < 0 || repeat_max > 1) repeat_max = 1;
4608          }          }
4609    
4610        /* The case of a zero minimum is special because of the need to stick        /* The case of a zero minimum is special because of the need to stick
4611        OP_BRAZERO in front of it, and because the group appears once in the        OP_BRAZERO in front of it, and because the group appears once in the
# Line 4833  for (;; ptr++) Line 4839  for (;; ptr++)
4839          {          {
4840          uschar *ketcode = code - 1 - LINK_SIZE;          uschar *ketcode = code - 1 - LINK_SIZE;
4841          uschar *bracode = ketcode - GET(ketcode, 1);          uschar *bracode = ketcode - GET(ketcode, 1);
4842    
4843          if (*bracode == OP_ONCE && possessive_quantifier) *bracode = OP_BRA;          if (*bracode == OP_ONCE && possessive_quantifier) *bracode = OP_BRA;
4844          if (*bracode == OP_ONCE)          if (*bracode == OP_ONCE)
4845            *ketcode = OP_KETRMAX + repeat_type;            *ketcode = OP_KETRMAX + repeat_type;
4846          else          else
4847            {            {
# Line 4886  for (;; ptr++) Line 4892  for (;; ptr++)
4892      there are special alternative opcodes for this case. For anything else, we      there are special alternative opcodes for this case. For anything else, we
4893      wrap the entire repeated item inside OP_ONCE brackets. Logically, the '+'      wrap the entire repeated item inside OP_ONCE brackets. Logically, the '+'
4894      notation is just syntactic sugar, taken from Sun's Java package, but the      notation is just syntactic sugar, taken from Sun's Java package, but the
4895      special opcodes can optimize it.      special opcodes can optimize it.
4896    
4897      Possessively repeated subpatterns have already been handled in the code      Possessively repeated subpatterns have already been handled in the code
4898      just above, so possessive_quantifier is always FALSE for them at this      just above, so possessive_quantifier is always FALSE for them at this
4899      stage.      stage.
4900    
4901      Note that the repeated item starts at tempcode, not at previous, which      Note that the repeated item starts at tempcode, not at previous, which
4902      might be the first part of a string whose (former) last char we repeated.      might be the first part of a string whose (former) last char we repeated.
4903    
# Line 4997  for (;; ptr++) Line 5003  for (;; ptr++)
5003        while ((cd->ctypes[*++ptr] & ctype_letter) != 0) {};        while ((cd->ctypes[*++ptr] & ctype_letter) != 0) {};
5004        namelen = (int)(ptr - name);        namelen = (int)(ptr - name);
5005    
5006          /* It appears that Perl allows any characters whatsoever, other than
5007          a closing parenthesis, to appear in arguments, so we no longer insist on
5008          letters, digits, and underscores. */
5009    
5010        if (*ptr == CHAR_COLON)        if (*ptr == CHAR_COLON)
5011          {          {
5012          arg = ++ptr;          arg = ++ptr;
5013          while ((cd->ctypes[*ptr] & (ctype_letter|ctype_digit)) != 0          while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
           || *ptr == '_') ptr++;  
5014          arglen = (int)(ptr - arg);          arglen = (int)(ptr - arg);
5015          }          }
5016    
# Line 5018  for (;; ptr++) Line 5027  for (;; ptr++)
5027          if (namelen == verbs[i].len &&          if (namelen == verbs[i].len &&
5028              strncmp((char *)name, vn, namelen) == 0)              strncmp((char *)name, vn, namelen) == 0)
5029            {            {
5030            /* Check for open captures before ACCEPT and convert it to            /* Check for open captures before ACCEPT and convert it to
5031            ASSERT_ACCEPT if in an assertion. */            ASSERT_ACCEPT if in an assertion. */
5032    
5033            if (verbs[i].op == OP_ACCEPT)            if (verbs[i].op == OP_ACCEPT)
# Line 5028  for (;; ptr++) Line 5037  for (;; ptr++)
5037                {                {
5038                *errorcodeptr = ERR59;                *errorcodeptr = ERR59;
5039                goto FAILED;                goto FAILED;
5040                }                }
5041              cd->had_accept = TRUE;              cd->had_accept = TRUE;
5042              for (oc = cd->open_caps; oc != NULL; oc = oc->next)              for (oc = cd->open_caps; oc != NULL; oc = oc->next)
5043                {                {
# Line 5036  for (;; ptr++) Line 5045  for (;; ptr++)
5045                PUT2INC(code, 0, oc->number);                PUT2INC(code, 0, oc->number);
5046                }                }
5047              *code++ = (cd->assert_depth > 0)? OP_ASSERT_ACCEPT : OP_ACCEPT;              *code++ = (cd->assert_depth > 0)? OP_ASSERT_ACCEPT : OP_ACCEPT;
5048    
5049                /* Do not set firstbyte after *ACCEPT */
5050                if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
5051              }              }
5052    
5053            /* Handle other cases with/without an argument */            /* Handle other cases with/without an argument */
# Line 5052  for (;; ptr++) Line 5064  for (;; ptr++)
5064                {                {
5065                PUT(code, 0, code - bcptr->current_branch - 1);                PUT(code, 0, code - bcptr->current_branch - 1);
5066                code += LINK_SIZE;                code += LINK_SIZE;
5067                  cd->external_flags |= PCRE_HASTHEN;
5068                }                }
5069              }              }
5070    
# Line 5329  for (;; ptr++) Line 5342  for (;; ptr++)
5342          /* ------------------------------------------------------------ */          /* ------------------------------------------------------------ */
5343          case CHAR_EQUALS_SIGN:                 /* Positive lookahead */          case CHAR_EQUALS_SIGN:                 /* Positive lookahead */
5344          bravalue = OP_ASSERT;          bravalue = OP_ASSERT;
5345          cd->assert_depth += 1;          cd->assert_depth += 1;
5346          ptr++;          ptr++;
5347          break;          break;
5348    
# Line 5344  for (;; ptr++) Line 5357  for (;; ptr++)
5357            continue;            continue;
5358            }            }
5359          bravalue = OP_ASSERT_NOT;          bravalue = OP_ASSERT_NOT;
5360          cd->assert_depth += 1;          cd->assert_depth += 1;
5361          break;          break;
5362    
5363    
# Line 5354  for (;; ptr++) Line 5367  for (;; ptr++)
5367            {            {
5368            case CHAR_EQUALS_SIGN:               /* Positive lookbehind */            case CHAR_EQUALS_SIGN:               /* Positive lookbehind */
5369            bravalue = OP_ASSERTBACK;            bravalue = OP_ASSERTBACK;
5370            cd->assert_depth += 1;            cd->assert_depth += 1;
5371            ptr += 2;            ptr += 2;
5372            break;            break;
5373    
5374            case CHAR_EXCLAMATION_MARK:          /* Negative lookbehind */            case CHAR_EXCLAMATION_MARK:          /* Negative lookbehind */
5375            bravalue = OP_ASSERTBACK_NOT;            bravalue = OP_ASSERTBACK_NOT;
5376            cd->assert_depth += 1;            cd->assert_depth += 1;
5377            ptr += 2;            ptr += 2;
5378            break;            break;
5379    
# Line 5604  for (;; ptr++) Line 5617  for (;; ptr++)
5617    
5618            temp = cd->end_pattern;            temp = cd->end_pattern;
5619            cd->end_pattern = ptr;            cd->end_pattern = ptr;
5620            recno = find_parens(cd, name, namelen,            recno = find_parens(cd, name, namelen,
5621              (options & PCRE_EXTENDED) != 0, utf8);              (options & PCRE_EXTENDED) != 0, utf8);
5622            cd->end_pattern = temp;            cd->end_pattern = temp;
5623            if (recno < 0) recno = 0;    /* Forward ref; set dummy number */            if (recno < 0) recno = 0;    /* Forward ref; set dummy number */
# Line 5759  for (;; ptr++) Line 5772  for (;; ptr++)
5772    
5773              /* If not a forward reference, and the subpattern is still open,              /* If not a forward reference, and the subpattern is still open,
5774              this is a recursive call. We check to see if this is a left              this is a recursive call. We check to see if this is a left
5775              recursion that could loop for ever, and diagnose that case. */              recursion that could loop for ever, and diagnose that case. We
5776                must not, however, do this check if we are in a conditional
5777                subpattern because the condition might be testing for recursion in
5778                a pattern such as /(?(R)a+|(?R)b)/, which is perfectly valid.
5779                Forever loops are also detected at runtime, so those that occur in
5780                conditional subpatterns will be picked up then. */
5781    
5782              else if (GET(called, 1) == 0 &&              else if (GET(called, 1) == 0 && cond_depth <= 0 &&
5783                       could_be_empty(called, code, bcptr, utf8, cd))                       could_be_empty(called, code, bcptr, utf8, cd))
5784                {                {
5785                *errorcodeptr = ERR40;                *errorcodeptr = ERR40;
# Line 5770  for (;; ptr++) Line 5788  for (;; ptr++)
5788              }              }
5789    
5790            /* Insert the recursion/subroutine item. */            /* Insert the recursion/subroutine item. */
5791    
5792            *code = OP_RECURSE;            *code = OP_RECURSE;
5793            PUT(code, 1, (int)(called - cd->start_code));            PUT(code, 1, (int)(called - cd->start_code));
5794            code += 1 + LINK_SIZE;            code += 1 + LINK_SIZE;
# Line 5893  for (;; ptr++) Line 5911  for (;; ptr++)
5911      repeated. We copy code into a non-register variable (tempcode) in order to      repeated. We copy code into a non-register variable (tempcode) in order to
5912      be able to pass its address because some compilers complain otherwise. */      be able to pass its address because some compilers complain otherwise. */
5913    
5914      previous = code;                   /* For handling repetition */      previous = code;                      /* For handling repetition */
5915      *code = bravalue;      *code = bravalue;
5916      tempcode = code;      tempcode = code;
5917      tempreqvary = cd->req_varyopt;     /* Save value before bracket */      tempreqvary = cd->req_varyopt;        /* Save value before bracket */
5918      length_prevgroup = 0;              /* Initialize for pre-compile phase */      length_prevgroup = 0;                 /* Initialize for pre-compile phase */
5919    
5920      if (!compile_regex(      if (!compile_regex(
5921           newoptions,                   /* The complete new option state */           newoptions,                      /* The complete new option state */
5922           &tempcode,                    /* Where to put code (updated) */           &tempcode,                       /* Where to put code (updated) */
5923           &ptr,                         /* Input pointer (updated) */           &ptr,                            /* Input pointer (updated) */
5924           errorcodeptr,                 /* Where to put an error message */           errorcodeptr,                    /* Where to put an error message */
5925           (bravalue == OP_ASSERTBACK ||           (bravalue == OP_ASSERTBACK ||
5926            bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */            bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */
5927           reset_bracount,               /* True if (?| group */           reset_bracount,                  /* True if (?| group */
5928           skipbytes,                    /* Skip over bracket number */           skipbytes,                       /* Skip over bracket number */
5929           &subfirstbyte,                /* For possible first char */           cond_depth +
5930           &subreqbyte,                  /* For possible last char */             ((bravalue == OP_COND)?1:0),   /* Depth of condition subpatterns */
5931           bcptr,                        /* Current branch chain */           &subfirstbyte,                   /* For possible first char */
5932           cd,                           /* Tables block */           &subreqbyte,                     /* For possible last char */
5933           (lengthptr == NULL)? NULL :   /* Actual compile phase */           bcptr,                           /* Current branch chain */
5934             &length_prevgroup           /* Pre-compile phase */           cd,                              /* Tables block */
5935             (lengthptr == NULL)? NULL :      /* Actual compile phase */
5936               &length_prevgroup              /* Pre-compile phase */
5937           ))           ))
5938        goto FAILED;        goto FAILED;
5939    
5940      if (bravalue >= OP_ASSERT && bravalue <= OP_ASSERTBACK_NOT)      if (bravalue >= OP_ASSERT && bravalue <= OP_ASSERTBACK_NOT)
5941        cd->assert_depth -= 1;        cd->assert_depth -= 1;
5942    
5943      /* At the end of compiling, code is still pointing to the start of the      /* At the end of compiling, code is still pointing to the start of the
5944      group, while tempcode has been updated to point past the end of the group      group, while tempcode has been updated to point past the end of the group
# Line 6166  for (;; ptr++) Line 6186  for (;; ptr++)
6186            ptr[1] != CHAR_APOSTROPHE && ptr[1] != CHAR_LEFT_CURLY_BRACKET))            ptr[1] != CHAR_APOSTROPHE && ptr[1] != CHAR_LEFT_CURLY_BRACKET))
6187            {            {
6188            *errorcodeptr = ERR69;            *errorcodeptr = ERR69;
6189            break;            break;
6190            }            }
6191          is_recurse = FALSE;          is_recurse = FALSE;
6192          terminator = (*(++ptr) == CHAR_LESS_THAN_SIGN)?          terminator = (*(++ptr) == CHAR_LESS_THAN_SIGN)?
6193            CHAR_GREATER_THAN_SIGN : (*ptr == CHAR_APOSTROPHE)?            CHAR_GREATER_THAN_SIGN : (*ptr == CHAR_APOSTROPHE)?
6194            CHAR_APOSTROPHE : CHAR_RIGHT_CURLY_BRACKET;            CHAR_APOSTROPHE : CHAR_RIGHT_CURLY_BRACKET;
6195          goto NAMED_REF_OR_RECURSE;          goto NAMED_REF_OR_RECURSE;
6196          }          }
6197    
6198        /* Back references are handled specially; must disable firstbyte if        /* Back references are handled specially; must disable firstbyte if
6199        not set to cope with cases like (?=(\w+))\1: which would otherwise set        not set to cope with cases like (?=(\w+))\1: which would otherwise set
# Line 6307  for (;; ptr++) Line 6327  for (;; ptr++)
6327      byte, set it from this character, but revert to none on a zero repeat.      byte, set it from this character, but revert to none on a zero repeat.
6328      Otherwise, leave the firstbyte value alone, and don't change it on a zero      Otherwise, leave the firstbyte value alone, and don't change it on a zero
6329      repeat. */      repeat. */
6330    
6331      if (firstbyte == REQ_UNSET)      if (firstbyte == REQ_UNSET)
6332        {        {
6333        zerofirstbyte = REQ_NONE;        zerofirstbyte = REQ_NONE;
# Line 6324  for (;; ptr++) Line 6344  for (;; ptr++)
6344        else firstbyte = reqbyte = REQ_NONE;        else firstbyte = reqbyte = REQ_NONE;
6345        }        }
6346    
6347      /* firstbyte was previously set; we can set reqbyte only the length is      /* firstbyte was previously set; we can set reqbyte only if the length is
6348      1 or the matching is caseful. */      1 or the matching is caseful. */
6349    
6350      else      else
# Line 6371  Arguments: Line 6391  Arguments:
6391    lookbehind     TRUE if this is a lookbehind assertion    lookbehind     TRUE if this is a lookbehind assertion
6392    reset_bracount TRUE to reset the count for each branch    reset_bracount TRUE to reset the count for each branch
6393    skipbytes      skip this many bytes at start (for brackets and OP_COND)    skipbytes      skip this many bytes at start (for brackets and OP_COND)
6394      cond_depth     depth of nesting for conditional subpatterns
6395    firstbyteptr   place to put the first required character, or a negative number    firstbyteptr   place to put the first required character, or a negative number
6396    reqbyteptr     place to put the last required character, or a negative number    reqbyteptr     place to put the last required character, or a negative number
6397    bcptr          pointer to the chain of currently open branches    bcptr          pointer to the chain of currently open branches
# Line 6384  Returns:         TRUE on success Line 6405  Returns:         TRUE on success
6405  static BOOL  static BOOL
6406  compile_regex(int options, uschar **codeptr, const uschar **ptrptr,  compile_regex(int options, uschar **codeptr, const uschar **ptrptr,
6407    int *errorcodeptr, BOOL lookbehind, BOOL reset_bracount, int skipbytes,    int *errorcodeptr, BOOL lookbehind, BOOL reset_bracount, int skipbytes,
6408    int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, compile_data *cd,    int cond_depth, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,
6409    int *lengthptr)    compile_data *cd, int *lengthptr)
6410  {  {
6411  const uschar *ptr = *ptrptr;  const uschar *ptr = *ptrptr;
6412  uschar *code = *codeptr;  uschar *code = *codeptr;
# Line 6422  pre-compile phase to find out whether an Line 6443  pre-compile phase to find out whether an
6443    
6444  /* If this is a capturing subpattern, add to the chain of open capturing items  /* If this is a capturing subpattern, add to the chain of open capturing items
6445  so that we can detect them if (*ACCEPT) is encountered. This is also used to  so that we can detect them if (*ACCEPT) is encountered. This is also used to
6446  detect groups that contain recursive back references to themselves. Note that  detect groups that contain recursive back references to themselves. Note that
6447  only OP_CBRA need be tested here; changing this opcode to one of its variants,  only OP_CBRA need be tested here; changing this opcode to one of its variants,
6448  e.g. OP_SCBRAPOS, happens later, after the group has been compiled. */  e.g. OP_SCBRAPOS, happens later, after the group has been compiled. */
6449    
6450  if (*code == OP_CBRA)  if (*code == OP_CBRA)
# Line 6464  for (;;) Line 6485  for (;;)
6485    into the length. */    into the length. */
6486    
6487    if (!compile_branch(&options, &code, &ptr, errorcodeptr, &branchfirstbyte,    if (!compile_branch(&options, &code, &ptr, errorcodeptr, &branchfirstbyte,
6488          &branchreqbyte, &bc, cd, (lengthptr == NULL)? NULL : &length))          &branchreqbyte, &bc, cond_depth, cd,
6489            (lengthptr == NULL)? NULL : &length))
6490      {      {
6491      *ptrptr = ptr;      *ptrptr = ptr;
6492      return FALSE;      return FALSE;
# Line 6897  do { Line 6919  do {
6919       case OP_EXACT:       case OP_EXACT:
6920       scode += 2;       scode += 2;
6921       /* Fall through */       /* Fall through */
6922    
6923       case OP_CHAR:       case OP_CHAR:
6924       case OP_PLUS:       case OP_PLUS:
6925       case OP_MINPLUS:       case OP_MINPLUS:
# Line 6910  do { Line 6932  do {
6932       case OP_EXACTI:       case OP_EXACTI:
6933       scode += 2;       scode += 2;
6934       /* Fall through */       /* Fall through */
6935    
6936       case OP_CHARI:       case OP_CHARI:
6937       case OP_PLUSI:       case OP_PLUSI:
6938       case OP_MINPLUSI:       case OP_MINPLUSI:
# Line 7070  utf8 = (options & PCRE_UTF8) != 0; Line 7092  utf8 = (options & PCRE_UTF8) != 0;
7092    
7093  /* Can't support UTF8 unless PCRE has been compiled to include the code. The  /* Can't support UTF8 unless PCRE has been compiled to include the code. The
7094  return of an error code from _pcre_valid_utf8() is a new feature, introduced in  return of an error code from _pcre_valid_utf8() is a new feature, introduced in
7095  release 8.13. It is passed back from pcre_[dfa_]exec(), but at the moment is  release 8.13. It is passed back from pcre_[dfa_]exec(), but at the moment is
7096  not used here. */  not used here. */
7097    
7098  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
# Line 7103  if ((options & PCRE_UCP) != 0) Line 7125  if ((options & PCRE_UCP) != 0)
7125  if ((options & (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)) ==  if ((options & (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)) ==
7126       (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE))       (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE))
7127    {    {
7128    errorcode = ERR56;    errorcode = ERR56;
7129    goto PCRE_EARLY_ERROR_RETURN;    goto PCRE_EARLY_ERROR_RETURN;
7130    }    }
7131    
# Line 7189  outside can help speed up starting point Line 7211  outside can help speed up starting point
7211  ptr += skipatstart;  ptr += skipatstart;
7212  code = cworkspace;  code = cworkspace;
7213  *code = OP_BRA;  *code = OP_BRA;
7214  (void)compile_regex(cd->external_options, &code, &ptr, &errorcode, FALSE,  (void)compile_regex(cd->external_options, &code, &ptr, &errorcode, FALSE,
7215    FALSE, 0, &firstbyte, &reqbyte, NULL, cd, &length);    FALSE, 0, 0, &firstbyte, &reqbyte, NULL, cd, &length);
7216  if (errorcode != 0) goto PCRE_EARLY_ERROR_RETURN;  if (errorcode != 0) goto PCRE_EARLY_ERROR_RETURN;
7217    
7218  DPRINTF(("end pre-compile: length=%d workspace=%d\n", length,  DPRINTF(("end pre-compile: length=%d workspace=%d\n", length,
# Line 7263  of the function here. */ Line 7285  of the function here. */
7285  ptr = (const uschar *)pattern + skipatstart;  ptr = (const uschar *)pattern + skipatstart;
7286  code = (uschar *)codestart;  code = (uschar *)codestart;
7287  *code = OP_BRA;  *code = OP_BRA;
7288  (void)compile_regex(re->options, &code, &ptr, &errorcode, FALSE, FALSE, 0,  (void)compile_regex(re->options, &code, &ptr, &errorcode, FALSE, FALSE, 0, 0,
7289    &firstbyte, &reqbyte, NULL, cd, NULL);    &firstbyte, &reqbyte, NULL, cd, NULL);
7290  re->top_bracket = cd->bracount;  re->top_bracket = cd->bracount;
7291  re->top_backref = cd->top_backref;  re->top_backref = cd->top_backref;
7292  re->flags = cd->external_flags;  re->flags = cd->external_flags;
7293    
7294  if (cd->had_accept) reqbyte = -1;   /* Must disable after (*ACCEPT) */  if (cd->had_accept) reqbyte = REQ_NONE;   /* Must disable after (*ACCEPT) */
7295    
7296  /* If not reached end of pattern on success, there's an excess bracket. */  /* If not reached end of pattern on success, there's an excess bracket. */
7297    

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