/[pcre]/code/trunk/pcre_compile.c
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revision 602 by ph10, Wed May 25 08:29:03 2011 UTC revision 754 by ph10, Sat Nov 19 18:32:18 2011 UTC
# Line 393  static const char error_texts[] = Line 393  static const char error_texts[] =
393    "internal error: previously-checked referenced subpattern not found\0"    "internal error: previously-checked referenced subpattern not found\0"
394    "DEFINE group contains more than one branch\0"    "DEFINE group contains more than one branch\0"
395    /* 55 */    /* 55 */
396    "repeating a DEFINE group is not allowed\0"    "repeating a DEFINE group is not allowed\0"  /** DEAD **/
397    "inconsistent NEWLINE options\0"    "inconsistent NEWLINE options\0"
398    "\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"    "\\g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number\0"
399    "a numbered reference must not be zero\0"    "a numbered reference must not be zero\0"
# 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"
413      /* 70 */
414      "internal error: unknown opcode in find_fixedlength()\0"
415    ;    ;
416    
417  /* 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 545  static const unsigned char ebcdic_charta Line 548  static const unsigned char ebcdic_charta
548  /* Definition to allow mutual recursion */  /* Definition to allow mutual recursion */
549    
550  static BOOL  static BOOL
551    compile_regex(int, int, uschar **, const uschar **, int *, BOOL, BOOL, int,    compile_regex(int, uschar **, const uschar **, int *, BOOL, BOOL, int, int,
552      int *, int *, branch_chain *, compile_data *, int *);      int *, int *, branch_chain *, compile_data *, int *);
553    
554    
# Line 577  return s; Line 580  return s;
580    
581    
582  /*************************************************  /*************************************************
583    *            Check for counted repeat            *
584    *************************************************/
585    
586    /* This function is called when a '{' is encountered in a place where it might
587    start a quantifier. It looks ahead to see if it really is a quantifier or not.
588    It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}
589    where the ddds are digits.
590    
591    Arguments:
592      p         pointer to the first char after '{'
593    
594    Returns:    TRUE or FALSE
595    */
596    
597    static BOOL
598    is_counted_repeat(const uschar *p)
599    {
600    if ((digitab[*p++] & ctype_digit) == 0) return FALSE;
601    while ((digitab[*p] & ctype_digit) != 0) p++;
602    if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
603    
604    if (*p++ != CHAR_COMMA) return FALSE;
605    if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;
606    
607    if ((digitab[*p++] & ctype_digit) == 0) return FALSE;
608    while ((digitab[*p] & ctype_digit) != 0) p++;
609    
610    return (*p == CHAR_RIGHT_CURLY_BRACKET);
611    }
612    
613    
614    
615    /*************************************************
616  *            Handle escapes                      *  *            Handle escapes                      *
617  *************************************************/  *************************************************/
618    
# Line 642  else Line 678  else
678    
679      case CHAR_l:      case CHAR_l:
680      case CHAR_L:      case CHAR_L:
681        *errorcodeptr = ERR37;
682        break;
683    
684      case CHAR_u:      case CHAR_u:
685        if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
686          {
687          /* In JavaScript, \u must be followed by four hexadecimal numbers.
688          Otherwise it is a lowercase u letter. */
689          if ((digitab[ptr[1]] & ctype_xdigit) != 0 && (digitab[ptr[2]] & ctype_xdigit) != 0
690               && (digitab[ptr[3]] & ctype_xdigit) != 0 && (digitab[ptr[4]] & ctype_xdigit) != 0)
691            {
692            c = 0;
693            for (i = 0; i < 4; ++i)
694              {
695              register int cc = *(++ptr);
696    #ifndef EBCDIC  /* ASCII/UTF-8 coding */
697              if (cc >= CHAR_a) cc -= 32;               /* Convert to upper case */
698              c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
699    #else           /* EBCDIC coding */
700              if (cc >= CHAR_a && cc <= CHAR_z) cc += 64;  /* Convert to upper case */
701              c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
702    #endif
703              }
704            }
705          }
706        else
707          *errorcodeptr = ERR37;
708        break;
709    
710      case CHAR_U:      case CHAR_U:
711      *errorcodeptr = ERR37;      /* In JavaScript, \U is an uppercase U letter. */
712        if ((options & PCRE_JAVASCRIPT_COMPAT) == 0) *errorcodeptr = ERR37;
713      break;      break;
714    
715      /* \g must be followed by one of a number of specific things:      /* In a character class, \g is just a literal "g". Outside a character
716        class, \g must be followed by one of a number of specific things:
717    
718      (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
719      backreference. If negative, it is a relative backreference. This is a Perl      backreference. If negative, it is a relative backreference. This is a Perl
# Line 664  else Line 730  else
730      the -ESC_g code (cf \k). */      the -ESC_g code (cf \k). */
731    
732      case CHAR_g:      case CHAR_g:
733        if (isclass) break;
734      if (ptr[1] == CHAR_LESS_THAN_SIGN || ptr[1] == CHAR_APOSTROPHE)      if (ptr[1] == CHAR_LESS_THAN_SIGN || ptr[1] == CHAR_APOSTROPHE)
735        {        {
736        c = -ESC_g;        c = -ESC_g;
# Line 792  else Line 859  else
859      treated as a data character. */      treated as a data character. */
860    
861      case CHAR_x:      case CHAR_x:
862        if ((options & PCRE_JAVASCRIPT_COMPAT) != 0)
863          {
864          /* In JavaScript, \x must be followed by two hexadecimal numbers.
865          Otherwise it is a lowercase x letter. */
866          if ((digitab[ptr[1]] & ctype_xdigit) != 0 && (digitab[ptr[2]] & ctype_xdigit) != 0)
867            {
868            c = 0;
869            for (i = 0; i < 2; ++i)
870              {
871              register int cc = *(++ptr);
872    #ifndef EBCDIC  /* ASCII/UTF-8 coding */
873              if (cc >= CHAR_a) cc -= 32;               /* Convert to upper case */
874              c = (c << 4) + cc - ((cc < CHAR_A)? CHAR_0 : (CHAR_A - 10));
875    #else           /* EBCDIC coding */
876              if (cc >= CHAR_a && cc <= CHAR_z) cc += 64;  /* Convert to upper case */
877              c = (c << 4) + cc - ((cc >= CHAR_0)? CHAR_0 : (CHAR_A - 10));
878    #endif
879              }
880            }
881          break;
882          }
883    
884      if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)      if (ptr[1] == CHAR_LEFT_CURLY_BRACKET)
885        {        {
886        const uschar *pt = ptr + 2;        const uschar *pt = ptr + 2;
# Line 885  else Line 974  else
974    }    }
975    
976  /* 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
977  newline". PCRE does not support \N{name}. */  newline". PCRE does not support \N{name}. However, it does support
978    quantification such as \N{2,3}. */
979    
980  if (c == -ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET)  if (c == -ESC_N && ptr[1] == CHAR_LEFT_CURLY_BRACKET &&
981         !is_counted_repeat(ptr+2))
982    *errorcodeptr = ERR37;    *errorcodeptr = ERR37;
983    
984  /* If PCRE_UCP is set, we change the values for \d etc. */  /* If PCRE_UCP is set, we change the values for \d etc. */
# Line 997  return -1; Line 1088  return -1;
1088    
1089    
1090  /*************************************************  /*************************************************
 *            Check for counted repeat            *  
 *************************************************/  
   
 /* This function is called when a '{' is encountered in a place where it might  
 start a quantifier. It looks ahead to see if it really is a quantifier or not.  
 It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}  
 where the ddds are digits.  
   
 Arguments:  
   p         pointer to the first char after '{'  
   
 Returns:    TRUE or FALSE  
 */  
   
 static BOOL  
 is_counted_repeat(const uschar *p)  
 {  
 if ((digitab[*p++] & ctype_digit) == 0) return FALSE;  
 while ((digitab[*p] & ctype_digit) != 0) p++;  
 if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;  
   
 if (*p++ != CHAR_COMMA) return FALSE;  
 if (*p == CHAR_RIGHT_CURLY_BRACKET) return TRUE;  
   
 if ((digitab[*p++] & ctype_digit) == 0) return FALSE;  
 while ((digitab[*p] & ctype_digit) != 0) p++;  
   
 return (*p == CHAR_RIGHT_CURLY_BRACKET);  
 }  
   
   
   
 /*************************************************  
1091  *         Read repeat counts                     *  *         Read repeat counts                     *
1092  *************************************************/  *************************************************/
1093    
# Line 1403  does not. Line 1461  does not.
1461    
1462  Arguments:  Arguments:
1463    code         pointer to the start of the group    code         pointer to the start of the group
   options      pointer to external options  
   optbit       the option bit whose changing is significant, or  
                  zero if none are  
1464    skipassert   TRUE if certain assertions are to be skipped    skipassert   TRUE if certain assertions are to be skipped
1465    
1466  Returns:       pointer to the first significant opcode  Returns:       pointer to the first significant opcode
1467  */  */
1468    
1469  static const uschar*  static const uschar*
1470  first_significant_code(const uschar *code, int *options, int optbit,  first_significant_code(const uschar *code, BOOL skipassert)
   BOOL skipassert)  
1471  {  {
1472  for (;;)  for (;;)
1473    {    {
# Line 1468  and doing the check at the end; a flag s Line 1522  and doing the check at the end; a flag s
1522    
1523  Arguments:  Arguments:
1524    code     points to the start of the pattern (the bracket)    code     points to the start of the pattern (the bracket)
1525    options  the compiling options    utf8     TRUE in UTF-8 mode
1526    atend    TRUE if called when the pattern is complete    atend    TRUE if called when the pattern is complete
1527    cd       the "compile data" structure    cd       the "compile data" structure
1528    
1529  Returns:   the fixed length,  Returns:   the fixed length,
1530               or -1 if there is no fixed length,               or -1 if there is no fixed length,
1531               or -2 if \C was encountered               or -2 if \C was encountered (in UTF-8 mode only)
1532               or -3 if an OP_RECURSE item was encountered and atend is FALSE               or -3 if an OP_RECURSE item was encountered and atend is FALSE
1533                 or -4 if an unknown opcode was encountered (internal error)
1534  */  */
1535    
1536  static int  static int
1537  find_fixedlength(uschar *code, int options, BOOL atend, compile_data *cd)  find_fixedlength(uschar *code, BOOL utf8, BOOL atend, compile_data *cd)
1538  {  {
1539  int length = -1;  int length = -1;
1540    
# Line 1496  for (;;) Line 1551  for (;;)
1551    register int op = *cc;    register int op = *cc;
1552    switch (op)    switch (op)
1553      {      {
1554        /* We only need to continue for OP_CBRA (normal capturing bracket) and
1555        OP_BRA (normal non-capturing bracket) because the other variants of these
1556        opcodes are all concerned with unlimited repeated groups, which of course
1557        are not of fixed length. */
1558    
1559      case OP_CBRA:      case OP_CBRA:
1560      case OP_BRA:      case OP_BRA:
1561      case OP_ONCE:      case OP_ONCE:
1562        case OP_ONCE_NC:
1563      case OP_COND:      case OP_COND:
1564      d = find_fixedlength(cc + ((op == OP_CBRA)? 2:0), options, atend, cd);      d = find_fixedlength(cc + ((op == OP_CBRA)? 2:0), utf8, atend, cd);
1565      if (d < 0) return d;      if (d < 0) return d;
1566      branchlength += d;      branchlength += d;
1567      do cc += GET(cc, 1); while (*cc == OP_ALT);      do cc += GET(cc, 1); while (*cc == OP_ALT);
1568      cc += 1 + LINK_SIZE;      cc += 1 + LINK_SIZE;
1569      break;      break;
1570    
1571      /* Reached end of a branch; if it's a ket it is the end of a nested      /* Reached end of a branch; if it's a ket it is the end of a nested call.
1572      call. If it's ALT it is an alternation in a nested call. If it is      If it's ALT it is an alternation in a nested call. An ACCEPT is effectively
1573      END it's the end of the outer call. All can be handled by the same code. */      an ALT. If it is END it's the end of the outer call. All can be handled by
1574        the same code. Note that we must not include the OP_KETRxxx opcodes here,
1575        because they all imply an unlimited repeat. */
1576    
1577      case OP_ALT:      case OP_ALT:
1578      case OP_KET:      case OP_KET:
     case OP_KETRMAX:  
     case OP_KETRMIN:  
1579      case OP_END:      case OP_END:
1580        case OP_ACCEPT:
1581        case OP_ASSERT_ACCEPT:
1582      if (length < 0) length = branchlength;      if (length < 0) length = branchlength;
1583        else if (length != branchlength) return -1;        else if (length != branchlength) return -1;
1584      if (*cc != OP_ALT) return length;      if (*cc != OP_ALT) return length;
# Line 1532  for (;;) Line 1595  for (;;)
1595      cs = ce = (uschar *)cd->start_code + GET(cc, 1);  /* Start subpattern */      cs = ce = (uschar *)cd->start_code + GET(cc, 1);  /* Start subpattern */
1596      do ce += GET(ce, 1); while (*ce == OP_ALT);       /* End subpattern */      do ce += GET(ce, 1); while (*ce == OP_ALT);       /* End subpattern */
1597      if (cc > cs && cc < ce) return -1;                /* Recursion */      if (cc > cs && cc < ce) return -1;                /* Recursion */
1598      d = find_fixedlength(cs + 2, options, atend, cd);      d = find_fixedlength(cs + 2, utf8, atend, cd);
1599      if (d < 0) return d;      if (d < 0) return d;
1600      branchlength += d;      branchlength += d;
1601      cc += 1 + LINK_SIZE;      cc += 1 + LINK_SIZE;
# Line 1549  for (;;) Line 1612  for (;;)
1612    
1613      /* Skip over things that don't match chars */      /* Skip over things that don't match chars */
1614    
1615      case OP_REVERSE:      case OP_MARK:
1616      case OP_CREF:      case OP_PRUNE_ARG:
1617      case OP_NCREF:      case OP_SKIP_ARG:
1618      case OP_RREF:      case OP_THEN_ARG:
1619      case OP_NRREF:      cc += cc[1] + _pcre_OP_lengths[*cc];
1620      case OP_DEF:      break;
1621    
1622      case OP_CALLOUT:      case OP_CALLOUT:
     case OP_SOD:  
     case OP_SOM:  
     case OP_SET_SOM:  
     case OP_EOD:  
     case OP_EODN:  
1623      case OP_CIRC:      case OP_CIRC:
1624      case OP_CIRCM:      case OP_CIRCM:
1625        case OP_CLOSE:
1626        case OP_COMMIT:
1627        case OP_CREF:
1628        case OP_DEF:
1629      case OP_DOLL:      case OP_DOLL:
1630      case OP_DOLLM:      case OP_DOLLM:
1631        case OP_EOD:
1632        case OP_EODN:
1633        case OP_FAIL:
1634        case OP_NCREF:
1635        case OP_NRREF:
1636      case OP_NOT_WORD_BOUNDARY:      case OP_NOT_WORD_BOUNDARY:
1637        case OP_PRUNE:
1638        case OP_REVERSE:
1639        case OP_RREF:
1640        case OP_SET_SOM:
1641        case OP_SKIP:
1642        case OP_SOD:
1643        case OP_SOM:
1644        case OP_THEN:
1645      case OP_WORD_BOUNDARY:      case OP_WORD_BOUNDARY:
1646      cc += _pcre_OP_lengths[*cc];      cc += _pcre_OP_lengths[*cc];
1647      break;      break;
# Line 1575  for (;;) Line 1651  for (;;)
1651      case OP_CHAR:      case OP_CHAR:
1652      case OP_CHARI:      case OP_CHARI:
1653      case OP_NOT:      case OP_NOT:
1654      case OP_NOTI:      case OP_NOTI:
1655      branchlength++;      branchlength++;
1656      cc += 2;      cc += 2;
1657  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
1658      if ((options & PCRE_UTF8) != 0 && cc[-1] >= 0xc0)      if (utf8 && cc[-1] >= 0xc0) cc += _pcre_utf8_table4[cc[-1] & 0x3f];
       cc += _pcre_utf8_table4[cc[-1] & 0x3f];  
1659  #endif  #endif
1660      break;      break;
1661    
# Line 1588  for (;;) Line 1663  for (;;)
1663      need to skip over a multibyte character in UTF8 mode.  */      need to skip over a multibyte character in UTF8 mode.  */
1664    
1665      case OP_EXACT:      case OP_EXACT:
1666        case OP_EXACTI:
1667        case OP_NOTEXACT:
1668        case OP_NOTEXACTI:
1669      branchlength += GET2(cc,1);      branchlength += GET2(cc,1);
1670      cc += 4;      cc += 4;
1671  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
1672      if ((options & PCRE_UTF8) != 0 && cc[-1] >= 0xc0)      if (utf8 && cc[-1] >= 0xc0) cc += _pcre_utf8_table4[cc[-1] & 0x3f];
       cc += _pcre_utf8_table4[cc[-1] & 0x3f];  
1673  #endif  #endif
1674      break;      break;
1675    
# Line 1609  for (;;) Line 1686  for (;;)
1686      cc += 2;      cc += 2;
1687      /* Fall through */      /* Fall through */
1688    
1689        case OP_HSPACE:
1690        case OP_VSPACE:
1691        case OP_NOT_HSPACE:
1692        case OP_NOT_VSPACE:
1693      case OP_NOT_DIGIT:      case OP_NOT_DIGIT:
1694      case OP_DIGIT:      case OP_DIGIT:
1695      case OP_NOT_WHITESPACE:      case OP_NOT_WHITESPACE:
# Line 1621  for (;;) Line 1702  for (;;)
1702      cc++;      cc++;
1703      break;      break;
1704    
1705      /* The single-byte matcher isn't allowed */      /* The single-byte matcher isn't allowed. This only happens in UTF-8 mode;
1706        otherwise \C is coded as OP_ALLANY. */
1707    
1708      case OP_ANYBYTE:      case OP_ANYBYTE:
1709      return -2;      return -2;
# Line 1640  for (;;) Line 1722  for (;;)
1722    
1723      switch (*cc)      switch (*cc)
1724        {        {
1725          case OP_CRPLUS:
1726          case OP_CRMINPLUS:
1727        case OP_CRSTAR:        case OP_CRSTAR:
1728        case OP_CRMINSTAR:        case OP_CRMINSTAR:
1729        case OP_CRQUERY:        case OP_CRQUERY:
# Line 1660  for (;;) Line 1744  for (;;)
1744    
1745      /* Anything else is variable length */      /* Anything else is variable length */
1746    
1747      default:      case OP_ANYNL:
1748        case OP_BRAMINZERO:
1749        case OP_BRAPOS:
1750        case OP_BRAPOSZERO:
1751        case OP_BRAZERO:
1752        case OP_CBRAPOS:
1753        case OP_EXTUNI:
1754        case OP_KETRMAX:
1755        case OP_KETRMIN:
1756        case OP_KETRPOS:
1757        case OP_MINPLUS:
1758        case OP_MINPLUSI:
1759        case OP_MINQUERY:
1760        case OP_MINQUERYI:
1761        case OP_MINSTAR:
1762        case OP_MINSTARI:
1763        case OP_MINUPTO:
1764        case OP_MINUPTOI:
1765        case OP_NOTMINPLUS:
1766        case OP_NOTMINPLUSI:
1767        case OP_NOTMINQUERY:
1768        case OP_NOTMINQUERYI:
1769        case OP_NOTMINSTAR:
1770        case OP_NOTMINSTARI:
1771        case OP_NOTMINUPTO:
1772        case OP_NOTMINUPTOI:
1773        case OP_NOTPLUS:
1774        case OP_NOTPLUSI:
1775        case OP_NOTPOSPLUS:
1776        case OP_NOTPOSPLUSI:
1777        case OP_NOTPOSQUERY:
1778        case OP_NOTPOSQUERYI:
1779        case OP_NOTPOSSTAR:
1780        case OP_NOTPOSSTARI:
1781        case OP_NOTPOSUPTO:
1782        case OP_NOTPOSUPTOI:
1783        case OP_NOTQUERY:
1784        case OP_NOTQUERYI:
1785        case OP_NOTSTAR:
1786        case OP_NOTSTARI:
1787        case OP_NOTUPTO:
1788        case OP_NOTUPTOI:
1789        case OP_PLUS:
1790        case OP_PLUSI:
1791        case OP_POSPLUS:
1792        case OP_POSPLUSI:
1793        case OP_POSQUERY:
1794        case OP_POSQUERYI:
1795        case OP_POSSTAR:
1796        case OP_POSSTARI:
1797        case OP_POSUPTO:
1798        case OP_POSUPTOI:
1799        case OP_QUERY:
1800        case OP_QUERYI:
1801        case OP_REF:
1802        case OP_REFI:
1803        case OP_SBRA:
1804        case OP_SBRAPOS:
1805        case OP_SCBRA:
1806        case OP_SCBRAPOS:
1807        case OP_SCOND:
1808        case OP_SKIPZERO:
1809        case OP_STAR:
1810        case OP_STARI:
1811        case OP_TYPEMINPLUS:
1812        case OP_TYPEMINQUERY:
1813        case OP_TYPEMINSTAR:
1814        case OP_TYPEMINUPTO:
1815        case OP_TYPEPLUS:
1816        case OP_TYPEPOSPLUS:
1817        case OP_TYPEPOSQUERY:
1818        case OP_TYPEPOSSTAR:
1819        case OP_TYPEPOSUPTO:
1820        case OP_TYPEQUERY:
1821        case OP_TYPESTAR:
1822        case OP_TYPEUPTO:
1823        case OP_UPTO:
1824        case OP_UPTOI:
1825      return -1;      return -1;
1826    
1827        /* Catch unrecognized opcodes so that when new ones are added they
1828        are not forgotten, as has happened in the past. */
1829    
1830        default:
1831        return -4;
1832      }      }
1833    }    }
1834  /* Control never gets here */  /* Control never gets here */
# Line 1694  _pcre_find_bracket(const uschar *code, B Line 1861  _pcre_find_bracket(const uschar *code, B
1861  for (;;)  for (;;)
1862    {    {
1863    register int c = *code;    register int c = *code;
1864    
1865    if (c == OP_END) return NULL;    if (c == OP_END) return NULL;
1866    
1867    /* XCLASS is used for classes that cannot be represented just by a bit    /* XCLASS is used for classes that cannot be represented just by a bit
# Line 1712  for (;;) Line 1880  for (;;)
1880    
1881    /* Handle capturing bracket */    /* Handle capturing bracket */
1882    
1883    else if (c == OP_CBRA)    else if (c == OP_CBRA || c == OP_SCBRA ||
1884               c == OP_CBRAPOS || c == OP_SCBRAPOS)
1885      {      {
1886      int n = GET2(code, 1+LINK_SIZE);      int n = GET2(code, 1+LINK_SIZE);
1887      if (n == number) return (uschar *)code;      if (n == number) return (uschar *)code;
# Line 1754  for (;;) Line 1923  for (;;)
1923        break;        break;
1924    
1925        case OP_THEN_ARG:        case OP_THEN_ARG:
1926        code += code[1+LINK_SIZE];        code += code[1];
1927        break;        break;
1928        }        }
1929    
# Line 1873  for (;;) Line 2042  for (;;)
2042        break;        break;
2043    
2044        case OP_THEN_ARG:        case OP_THEN_ARG:
2045        code += code[1+LINK_SIZE];        code += code[1];
2046        break;        break;
2047        }        }
2048    
# Line 1954  could_be_empty_branch(const uschar *code Line 2123  could_be_empty_branch(const uschar *code
2123    compile_data *cd)    compile_data *cd)
2124  {  {
2125  register int c;  register int c;
2126  for (code = first_significant_code(code + _pcre_OP_lengths[*code], NULL, 0, TRUE);  for (code = first_significant_code(code + _pcre_OP_lengths[*code], TRUE);
2127       code < endcode;       code < endcode;
2128       code = first_significant_code(code + _pcre_OP_lengths[c], NULL, 0, TRUE))       code = first_significant_code(code + _pcre_OP_lengths[c], TRUE))
2129    {    {
2130    const uschar *ccode;    const uschar *ccode;
2131    
# Line 1972  for (code = first_significant_code(code Line 2141  for (code = first_significant_code(code
2141      continue;      continue;
2142      }      }
2143    
   /* Groups with zero repeats can of course be empty; skip them. */  
   
   if (c == OP_BRAZERO || c == OP_BRAMINZERO || c == OP_SKIPZERO)  
     {  
     code += _pcre_OP_lengths[c];  
     do code += GET(code, 1); while (*code == OP_ALT);  
     c = *code;  
     continue;  
     }  
   
2144    /* For a recursion/subroutine call, if its end has been reached, which    /* For a recursion/subroutine call, if its end has been reached, which
2145    implies a subroutine call, we can scan it. */    implies a backward reference subroutine call, we can scan it. If it's a
2146      forward reference subroutine call, we can't. To detect forward reference
2147      we have to scan up the list that is kept in the workspace. This function is
2148      called only when doing the real compile, not during the pre-compile that
2149      measures the size of the compiled pattern. */
2150    
2151    if (c == OP_RECURSE)    if (c == OP_RECURSE)
2152      {      {
2153      BOOL empty_branch = FALSE;      const uschar *scode;
2154      const uschar *scode = cd->start_code + GET(code, 1);      BOOL empty_branch;
2155    
2156        /* Test for forward reference */
2157    
2158        for (scode = cd->start_workspace; scode < cd->hwm; scode += LINK_SIZE)
2159          if (GET(scode, 0) == code + 1 - cd->start_code) return TRUE;
2160    
2161        /* Not a forward reference, test for completed backward reference */
2162    
2163        empty_branch = FALSE;
2164        scode = cd->start_code + GET(code, 1);
2165      if (GET(scode, 1) == 0) return TRUE;    /* Unclosed */      if (GET(scode, 1) == 0) return TRUE;    /* Unclosed */
2166    
2167        /* Completed backwards reference */
2168    
2169      do      do
2170        {        {
2171        if (could_be_empty_branch(scode, endcode, utf8, cd))        if (could_be_empty_branch(scode, endcode, utf8, cd))
# Line 2000  for (code = first_significant_code(code Line 2176  for (code = first_significant_code(code
2176        scode += GET(scode, 1);        scode += GET(scode, 1);
2177        }        }
2178      while (*scode == OP_ALT);      while (*scode == OP_ALT);
2179    
2180      if (!empty_branch) return FALSE;  /* All branches are non-empty */      if (!empty_branch) return FALSE;  /* All branches are non-empty */
2181      continue;      continue;
2182      }      }
2183    
2184      /* Groups with zero repeats can of course be empty; skip them. */
2185    
2186      if (c == OP_BRAZERO || c == OP_BRAMINZERO || c == OP_SKIPZERO ||
2187          c == OP_BRAPOSZERO)
2188        {
2189        code += _pcre_OP_lengths[c];
2190        do code += GET(code, 1); while (*code == OP_ALT);
2191        c = *code;
2192        continue;
2193        }
2194    
2195      /* A nested group that is already marked as "could be empty" can just be
2196      skipped. */
2197    
2198      if (c == OP_SBRA  || c == OP_SBRAPOS ||
2199          c == OP_SCBRA || c == OP_SCBRAPOS)
2200        {
2201        do code += GET(code, 1); while (*code == OP_ALT);
2202        c = *code;
2203        continue;
2204        }
2205    
2206    /* For other groups, scan the branches. */    /* For other groups, scan the branches. */
2207    
2208    if (c == OP_BRA || c == OP_CBRA || c == OP_ONCE || c == OP_COND)    if (c == OP_BRA  || c == OP_BRAPOS ||
2209          c == OP_CBRA || c == OP_CBRAPOS ||
2210          c == OP_ONCE || c == OP_ONCE_NC ||
2211          c == OP_COND)
2212      {      {
2213      BOOL empty_branch;      BOOL empty_branch;
2214      if (GET(code, 1) == 0) return TRUE;    /* Hit unclosed bracket */      if (GET(code, 1) == 0) return TRUE;    /* Hit unclosed bracket */
# Line 2135  for (code = first_significant_code(code Line 2337  for (code = first_significant_code(code
2337      case OP_KET:      case OP_KET:
2338      case OP_KETRMAX:      case OP_KETRMAX:
2339      case OP_KETRMIN:      case OP_KETRMIN:
2340        case OP_KETRPOS:
2341      case OP_ALT:      case OP_ALT:
2342      return TRUE;      return TRUE;
2343    
# Line 2177  for (code = first_significant_code(code Line 2380  for (code = first_significant_code(code
2380      break;      break;
2381    
2382      case OP_THEN_ARG:      case OP_THEN_ARG:
2383      code += code[1+LINK_SIZE];      code += code[1];
2384      break;      break;
2385    
2386      /* None of the remaining opcodes are required to match a character. */      /* None of the remaining opcodes are required to match a character. */
# Line 2200  return TRUE; Line 2403  return TRUE;
2403  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
2404  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,
2405  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.
2406    This function is called only during the real compile, not during the
2407    pre-compile.
2408    
2409  Arguments:  Arguments:
2410    code        points to start of the recursion    code        points to start of the recursion
# Line 2250  where Perl recognizes it as the POSIX cl Line 2455  where Perl recognizes it as the POSIX cl
2455  "l\ower". This is a lesser evil that not diagnosing bad classes when Perl does,  "l\ower". This is a lesser evil that not diagnosing bad classes when Perl does,
2456  I think.  I think.
2457    
2458    A user pointed out that PCRE was rejecting [:a[:digit:]] whereas Perl was not.
2459    It seems that the appearance of a nested POSIX class supersedes an apparent
2460    external class. For example, [:a[:digit:]b:] matches "a", "b", ":", or
2461    a digit.
2462    
2463    In Perl, unescaped square brackets may also appear as part of class names. For
2464    example, [:a[:abc]b:] gives unknown POSIX class "[:abc]b:]". However, for
2465    [:a[:abc]b][b:] it gives unknown POSIX class "[:abc]b][b:]", which does not
2466    seem right at all. PCRE does not allow closing square brackets in POSIX class
2467    names.
2468    
2469  Arguments:  Arguments:
2470    ptr      pointer to the initial [    ptr      pointer to the initial [
2471    endptr   where to return the end pointer    endptr   where to return the end pointer
# Line 2264  int terminator; /* Don't combin Line 2480  int terminator; /* Don't combin
2480  terminator = *(++ptr);   /* compiler warns about "non-constant" initializer. */  terminator = *(++ptr);   /* compiler warns about "non-constant" initializer. */
2481  for (++ptr; *ptr != 0; ptr++)  for (++ptr; *ptr != 0; ptr++)
2482    {    {
2483    if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET) ptr++; else    if (*ptr == CHAR_BACKSLASH && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2484        ptr++;
2485      else if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;
2486      else
2487      {      {
     if (*ptr == CHAR_RIGHT_SQUARE_BRACKET) return FALSE;  
2488      if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)      if (*ptr == terminator && ptr[1] == CHAR_RIGHT_SQUARE_BRACKET)
2489        {        {
2490        *endptr = ptr;        *endptr = ptr;
2491        return TRUE;        return TRUE;
2492        }        }
2493        if (*ptr == CHAR_LEFT_SQUARE_BRACKET &&
2494             (ptr[1] == CHAR_COLON || ptr[1] == CHAR_DOT ||
2495              ptr[1] == CHAR_EQUALS_SIGN) &&
2496            check_posix_syntax(ptr, endptr))
2497          return FALSE;
2498      }      }
2499    }    }
2500  return FALSE;  return FALSE;
# Line 2682  if (next >= 0) switch(op_code) Line 2905  if (next >= 0) switch(op_code)
2905    return (c != cd->fcc[next]);  /* Non-UTF-8 mode */    return (c != cd->fcc[next]);  /* Non-UTF-8 mode */
2906    
2907    /* For OP_NOT and OP_NOTI, the data is always a single-byte character. These    /* For OP_NOT and OP_NOTI, the data is always a single-byte character. These
2908    opcodes are not used for multi-byte characters, because they are coded using    opcodes are not used for multi-byte characters, because they are coded using
2909    an XCLASS instead. */    an XCLASS instead. */
2910    
2911    case OP_NOT:    case OP_NOT:
2912    return (c = *previous) == next;    return (c = *previous) == next;
2913    
2914    case OP_NOTI:    case OP_NOTI:
2915    if ((c = *previous) == next) return TRUE;    if ((c = *previous) == next) return TRUE;
2916  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
2917    if (utf8)    if (utf8)
# Line 2981  Arguments: Line 3204  Arguments:
3204    firstbyteptr   set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)    firstbyteptr   set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)
3205    reqbyteptr     set to the last literal character required, else < 0    reqbyteptr     set to the last literal character required, else < 0
3206    bcptr          points to current branch chain    bcptr          points to current branch chain
3207      cond_depth     conditional nesting depth
3208    cd             contains pointers to tables etc.    cd             contains pointers to tables etc.
3209    lengthptr      NULL during the real compile phase    lengthptr      NULL during the real compile phase
3210                   points to length accumulator during pre-compile phase                   points to length accumulator during pre-compile phase
# Line 2992  Returns: TRUE on success Line 3216  Returns: TRUE on success
3216  static BOOL  static BOOL
3217  compile_branch(int *optionsptr, uschar **codeptr, const uschar **ptrptr,  compile_branch(int *optionsptr, uschar **codeptr, const uschar **ptrptr,
3218    int *errorcodeptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,    int *errorcodeptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,
3219    compile_data *cd, int *lengthptr)    int cond_depth, compile_data *cd, int *lengthptr)
3220  {  {
3221  int repeat_type, op_type;  int repeat_type, op_type;
3222  int repeat_min = 0, repeat_max = 0;      /* To please picky compilers */  int repeat_min = 0, repeat_max = 0;      /* To please picky compilers */
# Line 3001  int greedy_default, greedy_non_default; Line 3225  int greedy_default, greedy_non_default;
3225  int firstbyte, reqbyte;  int firstbyte, reqbyte;
3226  int zeroreqbyte, zerofirstbyte;  int zeroreqbyte, zerofirstbyte;
3227  int req_caseopt, reqvary, tempreqvary;  int req_caseopt, reqvary, tempreqvary;
3228  int options = *optionsptr;  int options = *optionsptr;               /* May change dynamically */
3229  int after_manual_callout = 0;  int after_manual_callout = 0;
3230  int length_prevgroup = 0;  int length_prevgroup = 0;
3231  register int c;  register int c;
# Line 3019  uschar *previous_callout = NULL; Line 3243  uschar *previous_callout = NULL;
3243  uschar *save_hwm = NULL;  uschar *save_hwm = NULL;
3244  uschar classbits[32];  uschar classbits[32];
3245    
3246    /* We can fish out the UTF-8 setting once and for all into a BOOL, but we
3247    must not do this for other options (e.g. PCRE_EXTENDED) because they may change
3248    dynamically as we process the pattern. */
3249    
3250  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
3251  BOOL class_utf8;  BOOL class_utf8;
3252  BOOL utf8 = (options & PCRE_UTF8) != 0;  BOOL utf8 = (options & PCRE_UTF8) != 0;
# Line 3027  uschar *class_utf8data_base; Line 3255  uschar *class_utf8data_base;
3255  uschar utf8_char[6];  uschar utf8_char[6];
3256  #else  #else
3257  BOOL utf8 = FALSE;  BOOL utf8 = FALSE;
 uschar *utf8_char = NULL;  
3258  #endif  #endif
3259    
3260  #ifdef PCRE_DEBUG  #ifdef PCRE_DEBUG
# Line 3078  for (;; ptr++) Line 3305  for (;; ptr++)
3305    int subfirstbyte;    int subfirstbyte;
3306    int terminator;    int terminator;
3307    int mclength;    int mclength;
3308      int tempbracount;
3309    uschar mcbuffer[8];    uschar mcbuffer[8];
3310    
3311    /* Get next byte in the pattern */    /* Get next byte in the pattern */
# Line 3125  for (;; ptr++) Line 3353  for (;; ptr++)
3353        }        }
3354    
3355      *lengthptr += (int)(code - last_code);      *lengthptr += (int)(code - last_code);
3356      DPRINTF(("length=%d added %d c=%c\n", *lengthptr, code - last_code, c));      DPRINTF(("length=%d added %d c=%c\n", *lengthptr, (int)(code - last_code),
3357          c));
3358    
3359      /* If "previous" is set and it is not at the start of the work space, move      /* If "previous" is set and it is not at the start of the work space, move
3360      it back to there, in order to avoid filling up the work space. Otherwise,      it back to there, in order to avoid filling up the work space. Otherwise,
# Line 3199  for (;; ptr++) Line 3428  for (;; ptr++)
3428      previous_callout = NULL;      previous_callout = NULL;
3429      }      }
3430    
3431    /* In extended mode, skip white space and comments */    /* In extended mode, skip white space and comments. */
3432    
3433    if ((options & PCRE_EXTENDED) != 0)    if ((options & PCRE_EXTENDED) != 0)
3434      {      {
# Line 4168  for (;; ptr++) Line 4397  for (;; ptr++)
4397      op_type = 0;                    /* Default single-char op codes */      op_type = 0;                    /* Default single-char op codes */
4398      possessive_quantifier = FALSE;  /* Default not possessive quantifier */      possessive_quantifier = FALSE;  /* Default not possessive quantifier */
4399    
4400      /* Save start of previous item, in case we have to move it up to make space      /* Save start of previous item, in case we have to move it up in order to
4401      for an inserted OP_ONCE for the additional '+' extension. */      insert something before it. */
4402    
4403      tempcode = previous;      tempcode = previous;
4404    
# Line 4192  for (;; ptr++) Line 4421  for (;; ptr++)
4421        }        }
4422      else repeat_type = greedy_default;      else repeat_type = greedy_default;
4423    
4424        /* If previous was a recursion call, wrap it in atomic brackets so that
4425        previous becomes the atomic group. All recursions were so wrapped in the
4426        past, but it no longer happens for non-repeated recursions. In fact, the
4427        repeated ones could be re-implemented independently so as not to need this,
4428        but for the moment we rely on the code for repeating groups. */
4429    
4430        if (*previous == OP_RECURSE)
4431          {
4432          memmove(previous + 1 + LINK_SIZE, previous, 1 + LINK_SIZE);
4433          *previous = OP_ONCE;
4434          PUT(previous, 1, 2 + 2*LINK_SIZE);
4435          previous[2 + 2*LINK_SIZE] = OP_KET;
4436          PUT(previous, 3 + 2*LINK_SIZE, 2 + 2*LINK_SIZE);
4437          code += 2 + 2 * LINK_SIZE;
4438          length_prevgroup = 3 + 3*LINK_SIZE;
4439    
4440          /* When actually compiling, we need to check whether this was a forward
4441          reference, and if so, adjust the offset. */
4442    
4443          if (lengthptr == NULL && cd->hwm >= cd->start_workspace + LINK_SIZE)
4444            {
4445            int offset = GET(cd->hwm, -LINK_SIZE);
4446            if (offset == previous + 1 - cd->start_code)
4447              PUT(cd->hwm, -LINK_SIZE, offset + 1 + LINK_SIZE);
4448            }
4449          }
4450    
4451        /* Now handle repetition for the different types of item. */
4452    
4453      /* If previous was a character match, abolish the item and generate a      /* If previous was a character match, abolish the item and generate a
4454      repeat item instead. If a char item has a minumum of more than one, ensure      repeat item instead. If a char item has a minumum of more than one, ensure
4455      that it is set in reqbyte - it might not be if a sequence such as x{3} is      that it is set in reqbyte - it might not be if a sequence such as x{3} is
# Line 4201  for (;; ptr++) Line 4459  for (;; ptr++)
4459      if (*previous == OP_CHAR || *previous == OP_CHARI)      if (*previous == OP_CHAR || *previous == OP_CHARI)
4460        {        {
4461        op_type = (*previous == OP_CHAR)? 0 : OP_STARI - OP_STAR;        op_type = (*previous == OP_CHAR)? 0 : OP_STARI - OP_STAR;
4462    
4463        /* Deal with UTF-8 characters that take up more than one byte. It's        /* Deal with UTF-8 characters that take up more than one byte. It's
4464        easier to write this out separately than try to macrify it. Use c to        easier to write this out separately than try to macrify it. Use c to
4465        hold the length of the character in bytes, plus 0x80 to flag that it's a        hold the length of the character in bytes, plus 0x80 to flag that it's a
# Line 4246  for (;; ptr++) Line 4504  for (;; ptr++)
4504      /* If previous was a single negated character ([^a] or similar), we use      /* If previous was a single negated character ([^a] or similar), we use
4505      one of the special opcodes, replacing it. The code is shared with single-      one of the special opcodes, replacing it. The code is shared with single-
4506      character repeats by setting opt_type to add a suitable offset into      character repeats by setting opt_type to add a suitable offset into
4507      repeat_type. We can also test for auto-possessification. OP_NOT and OP_NOTI      repeat_type. We can also test for auto-possessification. OP_NOT and OP_NOTI
4508      are currently used only for single-byte chars. */      are currently used only for single-byte chars. */
4509    
4510      else if (*previous == OP_NOT || *previous == OP_NOTI)      else if (*previous == OP_NOT || *previous == OP_NOTI)
# Line 4483  for (;; ptr++) Line 4741  for (;; ptr++)
4741        }        }
4742    
4743      /* If previous was a bracket group, we may have to replicate it in certain      /* If previous was a bracket group, we may have to replicate it in certain
4744      cases. */      cases. Note that at this point we can encounter only the "basic" bracket
4745        opcodes such as BRA and CBRA, as this is the place where they get converted
4746        into the more special varieties such as BRAPOS and SBRA. A test for >=
4747        OP_ASSERT and <= OP_COND includes ASSERT, ASSERT_NOT, ASSERTBACK,
4748        ASSERTBACK_NOT, ONCE, BRA, CBRA, and COND. Originally, PCRE did not allow
4749        repetition of assertions, but now it does, for Perl compatibility. */
4750    
4751      else if (*previous == OP_BRA  || *previous == OP_CBRA ||      else if (*previous >= OP_ASSERT && *previous <= OP_COND)
              *previous == OP_ONCE || *previous == OP_COND)  
4752        {        {
4753        register int i;        register int i;
       int ketoffset = 0;  
4754        int len = (int)(code - previous);        int len = (int)(code - previous);
4755        uschar *bralink = NULL;        uschar *bralink = NULL;
4756          uschar *brazeroptr = NULL;
4757    
4758        /* Repeating a DEFINE group is pointless */        /* Repeating a DEFINE group is pointless, but Perl allows the syntax, so
4759          we just ignore the repeat. */
4760    
4761        if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)        if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)
4762          {          goto END_REPEAT;
         *errorcodeptr = ERR55;  
         goto FAILED;  
         }  
4763    
4764        /* If the maximum repeat count is unlimited, find the end of the bracket        /* There is no sense in actually repeating assertions. The only potential
4765        by scanning through from the start, and compute the offset back to it        use of repetition is in cases when the assertion is optional. Therefore,
4766        from the current code pointer. */        if the minimum is greater than zero, just ignore the repeat. If the
4767          maximum is not not zero or one, set it to 1. */
4768        if (repeat_max == -1)  
4769          {        if (*previous < OP_ONCE)    /* Assertion */
4770          register uschar *ket = previous;          {
4771          do ket += GET(ket, 1); while (*ket != OP_KET);          if (repeat_min > 0) goto END_REPEAT;
4772          ketoffset = (int)(code - ket);          if (repeat_max < 0 || repeat_max > 1) repeat_max = 1;
4773          }          }
4774    
4775        /* 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
# Line 4530  for (;; ptr++) Line 4790  for (;; ptr++)
4790          **   goto END_REPEAT;          **   goto END_REPEAT;
4791          **   }          **   }
4792    
4793          However, that fails when a group is referenced as a subroutine from          However, that fails when a group or a subgroup within it is referenced
4794          elsewhere in the pattern, so now we stick in OP_SKIPZERO in front of it          as a subroutine from elsewhere in the pattern, so now we stick in
4795          so that it is skipped on execution. As we don't have a list of which          OP_SKIPZERO in front of it so that it is skipped on execution. As we
4796          groups are referenced, we cannot do this selectively.          don't have a list of which groups are referenced, we cannot do this
4797            selectively.
4798    
4799          If the maximum is 1 or unlimited, we just have to stick in the BRAZERO          If the maximum is 1 or unlimited, we just have to stick in the BRAZERO
4800          and do no more at this point. However, we do need to adjust any          and do no more at this point. However, we do need to adjust any
# Line 4553  for (;; ptr++) Line 4814  for (;; ptr++)
4814              *previous++ = OP_SKIPZERO;              *previous++ = OP_SKIPZERO;
4815              goto END_REPEAT;              goto END_REPEAT;
4816              }              }
4817              brazeroptr = previous;    /* Save for possessive optimizing */
4818            *previous++ = OP_BRAZERO + repeat_type;            *previous++ = OP_BRAZERO + repeat_type;
4819            }            }
4820    
# Line 4717  for (;; ptr++) Line 4979  for (;; ptr++)
4979            }            }
4980          }          }
4981    
4982        /* If the maximum is unlimited, set a repeater in the final copy. We        /* If the maximum is unlimited, set a repeater in the final copy. For
4983        can't just offset backwards from the current code point, because we        ONCE brackets, that's all we need to do. However, possessively repeated
4984        don't know if there's been an options resetting after the ket. The        ONCE brackets can be converted into non-capturing brackets, as the
4985        correct offset was computed above.        behaviour of (?:xx)++ is the same as (?>xx)++ and this saves having to
4986          deal with possessive ONCEs specially.
4987        Then, when we are doing the actual compile phase, check to see whether  
4988        this group is a non-atomic one that could match an empty string. If so,        Otherwise, when we are doing the actual compile phase, check to see
4989          whether this group is one that could match an empty string. If so,
4990        convert the initial operator to the S form (e.g. OP_BRA -> OP_SBRA) so        convert the initial operator to the S form (e.g. OP_BRA -> OP_SBRA) so
4991        that runtime checking can be done. [This check is also applied to        that runtime checking can be done. [This check is also applied to ONCE
4992        atomic groups at runtime, but in a different way.] */        groups at runtime, but in a different way.]
4993    
4994          Then, if the quantifier was possessive and the bracket is not a
4995          conditional, we convert the BRA code to the POS form, and the KET code to
4996          KETRPOS. (It turns out to be convenient at runtime to detect this kind of
4997          subpattern at both the start and at the end.) The use of special opcodes
4998          makes it possible to reduce greatly the stack usage in pcre_exec(). If
4999          the group is preceded by OP_BRAZERO, convert this to OP_BRAPOSZERO.
5000    
5001          Then, if the minimum number of matches is 1 or 0, cancel the possessive
5002          flag so that the default action below, of wrapping everything inside
5003          atomic brackets, does not happen. When the minimum is greater than 1,
5004          there will be earlier copies of the group, and so we still have to wrap
5005          the whole thing. */
5006    
5007        else        else
5008          {          {
5009          uschar *ketcode = code - ketoffset;          uschar *ketcode = code - 1 - LINK_SIZE;
5010          uschar *bracode = ketcode - GET(ketcode, 1);          uschar *bracode = ketcode - GET(ketcode, 1);
5011          *ketcode = OP_KETRMAX + repeat_type;  
5012          if (lengthptr == NULL && *bracode != OP_ONCE)          /* Convert possessive ONCE brackets to non-capturing */
5013    
5014            if ((*bracode == OP_ONCE || *bracode == OP_ONCE_NC) &&
5015                possessive_quantifier) *bracode = OP_BRA;
5016    
5017            /* For non-possessive ONCE brackets, all we need to do is to
5018            set the KET. */
5019    
5020            if (*bracode == OP_ONCE || *bracode == OP_ONCE_NC)
5021              *ketcode = OP_KETRMAX + repeat_type;
5022    
5023            /* Handle non-ONCE brackets and possessive ONCEs (which have been
5024            converted to non-capturing above). */
5025    
5026            else
5027            {            {
5028            uschar *scode = bracode;            /* In the compile phase, check for empty string matching. */
5029            do  
5030              if (lengthptr == NULL)
5031              {              {
5032              if (could_be_empty_branch(scode, ketcode, utf8, cd))              uschar *scode = bracode;
5033                do
5034                {                {
5035                *bracode += OP_SBRA - OP_BRA;                if (could_be_empty_branch(scode, ketcode, utf8, cd))
5036                break;                  {
5037                    *bracode += OP_SBRA - OP_BRA;
5038                    break;
5039                    }
5040                  scode += GET(scode, 1);
5041                }                }
5042              scode += GET(scode, 1);              while (*scode == OP_ALT);
5043              }              }
5044            while (*scode == OP_ALT);  
5045              /* Handle possessive quantifiers. */
5046    
5047              if (possessive_quantifier)
5048                {
5049                /* For COND brackets, we wrap the whole thing in a possessively
5050                repeated non-capturing bracket, because we have not invented POS
5051                versions of the COND opcodes. Because we are moving code along, we
5052                must ensure that any pending recursive references are updated. */
5053    
5054                if (*bracode == OP_COND || *bracode == OP_SCOND)
5055                  {
5056                  int nlen = (int)(code - bracode);
5057                  *code = OP_END;
5058                  adjust_recurse(bracode, 1 + LINK_SIZE, utf8, cd, save_hwm);
5059                  memmove(bracode + 1+LINK_SIZE, bracode, nlen);
5060                  code += 1 + LINK_SIZE;
5061                  nlen += 1 + LINK_SIZE;
5062                  *bracode = OP_BRAPOS;
5063                  *code++ = OP_KETRPOS;
5064                  PUTINC(code, 0, nlen);
5065                  PUT(bracode, 1, nlen);
5066                  }
5067    
5068                /* For non-COND brackets, we modify the BRA code and use KETRPOS. */
5069    
5070                else
5071                  {
5072                  *bracode += 1;              /* Switch to xxxPOS opcodes */
5073                  *ketcode = OP_KETRPOS;
5074                  }
5075    
5076                /* If the minimum is zero, mark it as possessive, then unset the
5077                possessive flag when the minimum is 0 or 1. */
5078    
5079                if (brazeroptr != NULL) *brazeroptr = OP_BRAPOSZERO;
5080                if (repeat_min < 2) possessive_quantifier = FALSE;
5081                }
5082    
5083              /* Non-possessive quantifier */
5084    
5085              else *ketcode = OP_KETRMAX + repeat_type;
5086            }            }
5087          }          }
5088        }        }
# Line 4766  for (;; ptr++) Line 5103  for (;; ptr++)
5103        }        }
5104    
5105      /* If the character following a repeat is '+', or if certain optimization      /* If the character following a repeat is '+', or if certain optimization
5106      tests above succeeded, possessive_quantifier is TRUE. For some of the      tests above succeeded, possessive_quantifier is TRUE. For some opcodes,
5107      simpler opcodes, there is an special alternative opcode for this. For      there are special alternative opcodes for this case. For anything else, we
5108      anything else, we wrap the entire repeated item inside OP_ONCE brackets.      wrap the entire repeated item inside OP_ONCE brackets. Logically, the '+'
5109      The '+' notation is just syntactic sugar, taken from Sun's Java package,      notation is just syntactic sugar, taken from Sun's Java package, but the
5110      but the special opcodes can optimize it a bit. The repeated item starts at      special opcodes can optimize it.
5111      tempcode, not at previous, which might be the first part of a string whose  
5112      (former) last char we repeated.      Some (but not all) possessively repeated subpatterns have already been
5113        completely handled in the code just above. For them, possessive_quantifier
5114        is always FALSE at this stage.
5115    
5116        Note that the repeated item starts at tempcode, not at previous, which
5117        might be the first part of a string whose (former) last char we repeated.
5118    
5119      Possessifying an 'exact' quantifier has no effect, so we can ignore it. But      Possessifying an 'exact' quantifier has no effect, so we can ignore it. But
5120      an 'upto' may follow. We skip over an 'exact' item, and then test the      an 'upto' may follow. We skip over an 'exact' item, and then test the
# Line 4876  for (;; ptr++) Line 5218  for (;; ptr++)
5218        while ((cd->ctypes[*++ptr] & ctype_letter) != 0) {};        while ((cd->ctypes[*++ptr] & ctype_letter) != 0) {};
5219        namelen = (int)(ptr - name);        namelen = (int)(ptr - name);
5220    
5221          /* It appears that Perl allows any characters whatsoever, other than
5222          a closing parenthesis, to appear in arguments, so we no longer insist on
5223          letters, digits, and underscores. */
5224    
5225        if (*ptr == CHAR_COLON)        if (*ptr == CHAR_COLON)
5226          {          {
5227          arg = ++ptr;          arg = ++ptr;
5228          while ((cd->ctypes[*ptr] & (ctype_letter|ctype_digit)) != 0          while (*ptr != 0 && *ptr != CHAR_RIGHT_PARENTHESIS) ptr++;
           || *ptr == '_') ptr++;  
5229          arglen = (int)(ptr - arg);          arglen = (int)(ptr - arg);
5230          }          }
5231    
# Line 4897  for (;; ptr++) Line 5242  for (;; ptr++)
5242          if (namelen == verbs[i].len &&          if (namelen == verbs[i].len &&
5243              strncmp((char *)name, vn, namelen) == 0)              strncmp((char *)name, vn, namelen) == 0)
5244            {            {
5245            /* Check for open captures before ACCEPT */            /* Check for open captures before ACCEPT and convert it to
5246              ASSERT_ACCEPT if in an assertion. */
5247    
5248            if (verbs[i].op == OP_ACCEPT)            if (verbs[i].op == OP_ACCEPT)
5249              {              {
5250              open_capitem *oc;              open_capitem *oc;
5251                if (arglen != 0)
5252                  {
5253                  *errorcodeptr = ERR59;
5254                  goto FAILED;
5255                  }
5256              cd->had_accept = TRUE;              cd->had_accept = TRUE;
5257              for (oc = cd->open_caps; oc != NULL; oc = oc->next)              for (oc = cd->open_caps; oc != NULL; oc = oc->next)
5258                {                {
5259                *code++ = OP_CLOSE;                *code++ = OP_CLOSE;
5260                PUT2INC(code, 0, oc->number);                PUT2INC(code, 0, oc->number);
5261                }                }
5262                *code++ = (cd->assert_depth > 0)? OP_ASSERT_ACCEPT : OP_ACCEPT;
5263    
5264                /* Do not set firstbyte after *ACCEPT */
5265                if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
5266              }              }
5267    
5268            /* Handle the cases with/without an argument */            /* Handle other cases with/without an argument */
5269    
5270            if (arglen == 0)            else if (arglen == 0)
5271              {              {
5272              if (verbs[i].op < 0)   /* Argument is mandatory */              if (verbs[i].op < 0)   /* Argument is mandatory */
5273                {                {
# Line 4920  for (;; ptr++) Line 5275  for (;; ptr++)
5275                goto FAILED;                goto FAILED;
5276                }                }
5277              *code = verbs[i].op;              *code = verbs[i].op;
5278              if (*code++ == OP_THEN)              if (*code++ == OP_THEN) cd->external_flags |= PCRE_HASTHEN;
               {  
               PUT(code, 0, code - bcptr->current_branch - 1);  
               code += LINK_SIZE;  
               }  
5279              }              }
5280    
5281            else            else
# Line 4935  for (;; ptr++) Line 5286  for (;; ptr++)
5286                goto FAILED;                goto FAILED;
5287                }                }
5288              *code = verbs[i].op_arg;              *code = verbs[i].op_arg;
5289              if (*code++ == OP_THEN_ARG)              if (*code++ == OP_THEN_ARG) cd->external_flags |= PCRE_HASTHEN;
               {  
               PUT(code, 0, code - bcptr->current_branch - 1);  
               code += LINK_SIZE;  
               }  
5290              *code++ = arglen;              *code++ = arglen;
5291              memcpy(code, arg, arglen);              memcpy(code, arg, arglen);
5292              code += arglen;              code += arglen;
# Line 5201  for (;; ptr++) Line 5548  for (;; ptr++)
5548          /* ------------------------------------------------------------ */          /* ------------------------------------------------------------ */
5549          case CHAR_EQUALS_SIGN:                 /* Positive lookahead */          case CHAR_EQUALS_SIGN:                 /* Positive lookahead */
5550          bravalue = OP_ASSERT;          bravalue = OP_ASSERT;
5551            cd->assert_depth += 1;
5552          ptr++;          ptr++;
5553          break;          break;
5554    
# Line 5215  for (;; ptr++) Line 5563  for (;; ptr++)
5563            continue;            continue;
5564            }            }
5565          bravalue = OP_ASSERT_NOT;          bravalue = OP_ASSERT_NOT;
5566            cd->assert_depth += 1;
5567          break;          break;
5568    
5569    
# Line 5224  for (;; ptr++) Line 5573  for (;; ptr++)
5573            {            {
5574            case CHAR_EQUALS_SIGN:               /* Positive lookbehind */            case CHAR_EQUALS_SIGN:               /* Positive lookbehind */
5575            bravalue = OP_ASSERTBACK;            bravalue = OP_ASSERTBACK;
5576              cd->assert_depth += 1;
5577            ptr += 2;            ptr += 2;
5578            break;            break;
5579    
5580            case CHAR_EXCLAMATION_MARK:          /* Negative lookbehind */            case CHAR_EXCLAMATION_MARK:          /* Negative lookbehind */
5581            bravalue = OP_ASSERTBACK_NOT;            bravalue = OP_ASSERTBACK_NOT;
5582              cd->assert_depth += 1;
5583            ptr += 2;            ptr += 2;
5584            break;            break;
5585    
# Line 5250  for (;; ptr++) Line 5601  for (;; ptr++)
5601    
5602          /* ------------------------------------------------------------ */          /* ------------------------------------------------------------ */
5603          case CHAR_C:                 /* Callout - may be followed by digits; */          case CHAR_C:                 /* Callout - may be followed by digits; */
5604          previous_callout = code;  /* Save for later completion */          previous_callout = code;     /* Save for later completion */
5605          after_manual_callout = 1; /* Skip one item before completing */          after_manual_callout = 1;    /* Skip one item before completing */
5606          *code++ = OP_CALLOUT;          *code++ = OP_CALLOUT;
5607            {            {
5608            int n = 0;            int n = 0;
# Line 5619  for (;; ptr++) Line 5970  for (;; ptr++)
5970    
5971                /* Fudge the value of "called" so that when it is inserted as an                /* Fudge the value of "called" so that when it is inserted as an
5972                offset below, what it actually inserted is the reference number                offset below, what it actually inserted is the reference number
5973                of the group. */                of the group. Then remember the forward reference. */
5974    
5975                called = cd->start_code + recno;                called = cd->start_code + recno;
5976                PUTINC(cd->hwm, 0, (int)(code + 2 + LINK_SIZE - cd->start_code));                PUTINC(cd->hwm, 0, (int)(code + 1 - cd->start_code));
5977                }                }
5978    
5979              /* If not a forward reference, and the subpattern is still open,              /* If not a forward reference, and the subpattern is still open,
5980              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
5981              recursion that could loop for ever, and diagnose that case. */              recursion that could loop for ever, and diagnose that case. We
5982                must not, however, do this check if we are in a conditional
5983                subpattern because the condition might be testing for recursion in
5984                a pattern such as /(?(R)a+|(?R)b)/, which is perfectly valid.
5985                Forever loops are also detected at runtime, so those that occur in
5986                conditional subpatterns will be picked up then. */
5987    
5988              else if (GET(called, 1) == 0 &&              else if (GET(called, 1) == 0 && cond_depth <= 0 &&
5989                       could_be_empty(called, code, bcptr, utf8, cd))                       could_be_empty(called, code, bcptr, utf8, cd))
5990                {                {
5991                *errorcodeptr = ERR40;                *errorcodeptr = ERR40;
# Line 5637  for (;; ptr++) Line 5993  for (;; ptr++)
5993                }                }
5994              }              }
5995    
5996            /* Insert the recursion/subroutine item, automatically wrapped inside            /* Insert the recursion/subroutine item. */
           "once" brackets. Set up a "previous group" length so that a  
           subsequent quantifier will work. */  
   
           *code = OP_ONCE;  
           PUT(code, 1, 2 + 2*LINK_SIZE);  
           code += 1 + LINK_SIZE;  
5997    
5998            *code = OP_RECURSE;            *code = OP_RECURSE;
5999            PUT(code, 1, (int)(called - cd->start_code));            PUT(code, 1, (int)(called - cd->start_code));
6000            code += 1 + LINK_SIZE;            code += 1 + LINK_SIZE;
   
           *code = OP_KET;  
           PUT(code, 1, 2 + 2*LINK_SIZE);  
           code += 1 + LINK_SIZE;  
   
           length_prevgroup = 3 + 3*LINK_SIZE;  
6001            }            }
6002    
6003          /* Can't determine a first byte now */          /* Can't determine a first byte now */
# Line 5714  for (;; ptr++) Line 6058  for (;; ptr++)
6058          is necessary to ensure we correctly detect the start of the pattern in          is necessary to ensure we correctly detect the start of the pattern in
6059          both phases.          both phases.
6060    
6061          If we are not at the pattern start, compile code to change the ims          If we are not at the pattern start, reset the greedy defaults and the
6062          options if this setting actually changes any of them, and reset the          case value for firstbyte and reqbyte. */
         greedy defaults and the case value for firstbyte and reqbyte. */  
6063    
6064          if (*ptr == CHAR_RIGHT_PARENTHESIS)          if (*ptr == CHAR_RIGHT_PARENTHESIS)
6065            {            {
# Line 5733  for (;; ptr++) Line 6076  for (;; ptr++)
6076              }              }
6077    
6078            /* Change options at this level, and pass them back for use            /* Change options at this level, and pass them back for use
6079            in subsequent branches. When not at the start of the pattern, this            in subsequent branches. */
           information is also necessary so that a resetting item can be  
           compiled at the end of a group (if we are in a group). */  
6080    
6081            *optionsptr = options = newoptions;            *optionsptr = options = newoptions;
6082            previous = NULL;       /* This item can't be repeated */            previous = NULL;       /* This item can't be repeated */
# Line 5771  for (;; ptr++) Line 6112  for (;; ptr++)
6112        skipbytes = 2;        skipbytes = 2;
6113        }        }
6114    
6115      /* Process nested bracketed regex. Assertions may not be repeated, but      /* Process nested bracketed regex. Assertions used not to be repeatable,
6116      other kinds can be. All their opcodes are >= OP_ONCE. We copy code into a      but this was changed for Perl compatibility, so all kinds can now be
6117      non-register variable in order to be able to pass its address because some      repeated. We copy code into a non-register variable (tempcode) in order to
6118      compilers complain otherwise. Pass in a new setting for the ims options if      be able to pass its address because some compilers complain otherwise. */
     they have changed. */  
6119    
6120      previous = (bravalue >= OP_ONCE)? code : NULL;      previous = code;                      /* For handling repetition */
6121      *code = bravalue;      *code = bravalue;
6122      tempcode = code;      tempcode = code;
6123      tempreqvary = cd->req_varyopt;     /* Save value before bracket */      tempreqvary = cd->req_varyopt;        /* Save value before bracket */
6124      length_prevgroup = 0;              /* Initialize for pre-compile phase */      tempbracount = cd->bracount;          /* Save value before bracket */
6125        length_prevgroup = 0;                 /* Initialize for pre-compile phase */
6126    
6127      if (!compile_regex(      if (!compile_regex(
6128           newoptions,                   /* The complete new option state */           newoptions,                      /* The complete new option state */
6129           options & PCRE_IMS,           /* The previous ims option state */           &tempcode,                       /* Where to put code (updated) */
6130           &tempcode,                    /* Where to put code (updated) */           &ptr,                            /* Input pointer (updated) */
6131           &ptr,                         /* Input pointer (updated) */           errorcodeptr,                    /* Where to put an error message */
          errorcodeptr,                 /* Where to put an error message */  
6132           (bravalue == OP_ASSERTBACK ||           (bravalue == OP_ASSERTBACK ||
6133            bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */            bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */
6134           reset_bracount,               /* True if (?| group */           reset_bracount,                  /* True if (?| group */
6135           skipbytes,                    /* Skip over bracket number */           skipbytes,                       /* Skip over bracket number */
6136           &subfirstbyte,                /* For possible first char */           cond_depth +
6137           &subreqbyte,                  /* For possible last char */             ((bravalue == OP_COND)?1:0),   /* Depth of condition subpatterns */
6138           bcptr,                        /* Current branch chain */           &subfirstbyte,                   /* For possible first char */
6139           cd,                           /* Tables block */           &subreqbyte,                     /* For possible last char */
6140           (lengthptr == NULL)? NULL :   /* Actual compile phase */           bcptr,                           /* Current branch chain */
6141             &length_prevgroup           /* Pre-compile phase */           cd,                              /* Tables block */
6142             (lengthptr == NULL)? NULL :      /* Actual compile phase */
6143               &length_prevgroup              /* Pre-compile phase */
6144           ))           ))
6145        goto FAILED;        goto FAILED;
6146    
6147        /* If this was an atomic group and there are no capturing groups within it,
6148        generate OP_ONCE_NC instead of OP_ONCE. */
6149    
6150        if (bravalue == OP_ONCE && cd->bracount <= tempbracount)
6151          *code = OP_ONCE_NC;
6152    
6153        if (bravalue >= OP_ASSERT && bravalue <= OP_ASSERTBACK_NOT)
6154          cd->assert_depth -= 1;
6155    
6156      /* 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
6157      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.
6158      and any option resetting that may follow it. The pattern pointer (ptr)      The pattern pointer (ptr) is on the bracket.
     is on the bracket. */  
6159    
6160      /* If this is a conditional bracket, check that there are no more than      If this is a conditional bracket, check that there are no more than
6161      two branches in the group, or just one if it's a DEFINE group. We do this      two branches in the group, or just one if it's a DEFINE group. We do this
6162      in the real compile phase, not in the pre-pass, where the whole group may      in the real compile phase, not in the pre-pass, where the whole group may
6163      not be available. */      not be available. */
# Line 5872  for (;; ptr++) Line 6222  for (;; ptr++)
6222          goto FAILED;          goto FAILED;
6223          }          }
6224        *lengthptr += length_prevgroup - 2 - 2*LINK_SIZE;        *lengthptr += length_prevgroup - 2 - 2*LINK_SIZE;
6225        *code++ = OP_BRA;        code++;   /* This already contains bravalue */
6226        PUTINC(code, 0, 1 + LINK_SIZE);        PUTINC(code, 0, 1 + LINK_SIZE);
6227        *code++ = OP_KET;        *code++ = OP_KET;
6228        PUTINC(code, 0, 1 + LINK_SIZE);        PUTINC(code, 0, 1 + LINK_SIZE);
# Line 6040  for (;; ptr++) Line 6390  for (;; ptr++)
6390          }          }
6391    
6392        /* \k<name> or \k'name' is a back reference by name (Perl syntax).        /* \k<name> or \k'name' is a back reference by name (Perl syntax).
6393        We also support \k{name} (.NET syntax) */        We also support \k{name} (.NET syntax).  */
6394    
6395        if (-c == ESC_k && (ptr[1] == CHAR_LESS_THAN_SIGN ||        if (-c == ESC_k)
           ptr[1] == CHAR_APOSTROPHE || ptr[1] == CHAR_LEFT_CURLY_BRACKET))  
6396          {          {
6397            if ((ptr[1] != CHAR_LESS_THAN_SIGN &&
6398              ptr[1] != CHAR_APOSTROPHE && ptr[1] != CHAR_LEFT_CURLY_BRACKET))
6399              {
6400              *errorcodeptr = ERR69;
6401              break;
6402              }
6403          is_recurse = FALSE;          is_recurse = FALSE;
6404          terminator = (*(++ptr) == CHAR_LESS_THAN_SIGN)?          terminator = (*(++ptr) == CHAR_LESS_THAN_SIGN)?
6405            CHAR_GREATER_THAN_SIGN : (*ptr == CHAR_APOSTROPHE)?            CHAR_GREATER_THAN_SIGN : (*ptr == CHAR_APOSTROPHE)?
# Line 6124  for (;; ptr++) Line 6479  for (;; ptr++)
6479            }            }
6480          else          else
6481  #endif  #endif
6482            {          /* In non-UTF-8 mode, we turn \C into OP_ALLANY instead of OP_ANYBYTE
6483            so that it works in DFA mode and in lookbehinds. */
6484    
6485              {
6486            previous = (-c > ESC_b && -c < ESC_Z)? code : NULL;            previous = (-c > ESC_b && -c < ESC_Z)? code : NULL;
6487            *code++ = -c;            *code++ = (!utf8 && c == -ESC_C)? OP_ALLANY : -c;
6488            }            }
6489          }          }
6490        continue;        continue;
# Line 6201  for (;; ptr++) Line 6559  for (;; ptr++)
6559        else firstbyte = reqbyte = REQ_NONE;        else firstbyte = reqbyte = REQ_NONE;
6560        }        }
6561    
6562      /* 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
6563      1 or the matching is caseful. */      1 or the matching is caseful. */
6564    
6565      else      else
# Line 6242  value of lengthptr distinguishes the two Line 6600  value of lengthptr distinguishes the two
6600    
6601  Arguments:  Arguments:
6602    options        option bits, including any changes for this subpattern    options        option bits, including any changes for this subpattern
   oldims         previous settings of ims option bits  
6603    codeptr        -> the address of the current code pointer    codeptr        -> the address of the current code pointer
6604    ptrptr         -> the address of the current pattern pointer    ptrptr         -> the address of the current pattern pointer
6605    errorcodeptr   -> pointer to error code variable    errorcodeptr   -> pointer to error code variable
6606    lookbehind     TRUE if this is a lookbehind assertion    lookbehind     TRUE if this is a lookbehind assertion
6607    reset_bracount TRUE to reset the count for each branch    reset_bracount TRUE to reset the count for each branch
6608    skipbytes      skip this many bytes at start (for brackets and OP_COND)    skipbytes      skip this many bytes at start (for brackets and OP_COND)
6609      cond_depth     depth of nesting for conditional subpatterns
6610    firstbyteptr   place to put the first required character, or a negative number    firstbyteptr   place to put the first required character, or a negative number
6611    reqbyteptr     place to put the last required character, or a negative number    reqbyteptr     place to put the last required character, or a negative number
6612    bcptr          pointer to the chain of currently open branches    bcptr          pointer to the chain of currently open branches
# Line 6260  Returns: TRUE on success Line 6618  Returns: TRUE on success
6618  */  */
6619    
6620  static BOOL  static BOOL
6621  compile_regex(int options, int oldims, uschar **codeptr, const uschar **ptrptr,  compile_regex(int options, uschar **codeptr, const uschar **ptrptr,
6622    int *errorcodeptr, BOOL lookbehind, BOOL reset_bracount, int skipbytes,    int *errorcodeptr, BOOL lookbehind, BOOL reset_bracount, int skipbytes,
6623    int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, compile_data *cd,    int cond_depth, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,
6624    int *lengthptr)    compile_data *cd, int *lengthptr)
6625  {  {
6626  const uschar *ptr = *ptrptr;  const uschar *ptr = *ptrptr;
6627  uschar *code = *codeptr;  uschar *code = *codeptr;
# Line 6277  int branchfirstbyte, branchreqbyte; Line 6635  int branchfirstbyte, branchreqbyte;
6635  int length;  int length;
6636  int orig_bracount;  int orig_bracount;
6637  int max_bracount;  int max_bracount;
 int old_external_options = cd->external_options;  
6638  branch_chain bc;  branch_chain bc;
6639    
6640  bc.outer = bcptr;  bc.outer = bcptr;
# Line 6301  pre-compile phase to find out whether an Line 6658  pre-compile phase to find out whether an
6658    
6659  /* 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
6660  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
6661  detect groups that contain recursive back references to themselves. */  detect groups that contain recursive back references to themselves. Note that
6662    only OP_CBRA need be tested here; changing this opcode to one of its variants,
6663    e.g. OP_SCBRAPOS, happens later, after the group has been compiled. */
6664    
6665  if (*code == OP_CBRA)  if (*code == OP_CBRA)
6666    {    {
# Line 6341  for (;;) Line 6700  for (;;)
6700    into the length. */    into the length. */
6701    
6702    if (!compile_branch(&options, &code, &ptr, errorcodeptr, &branchfirstbyte,    if (!compile_branch(&options, &code, &ptr, errorcodeptr, &branchfirstbyte,
6703          &branchreqbyte, &bc, cd, (lengthptr == NULL)? NULL : &length))          &branchreqbyte, &bc, cond_depth, cd,
6704            (lengthptr == NULL)? NULL : &length))
6705      {      {
6706      *ptrptr = ptr;      *ptrptr = ptr;
6707      return FALSE;      return FALSE;
6708      }      }
6709    
   /* If the external options have changed during this branch, it means that we  
   are at the top level, and a leading option setting has been encountered. We  
   need to re-set the original option values to take account of this so that,  
   during the pre-compile phase, we know to allow for a re-set at the start of  
   subsequent branches. */  
   
   if (old_external_options != cd->external_options)  
     oldims = cd->external_options & PCRE_IMS;  
   
6710    /* Keep the highest bracket count in case (?| was used and some branch    /* Keep the highest bracket count in case (?| was used and some branch
6711    has fewer than the rest. */    has fewer than the rest. */
6712    
# Line 6416  for (;;) Line 6767  for (;;)
6767        {        {
6768        int fixed_length;        int fixed_length;
6769        *code = OP_END;        *code = OP_END;
6770        fixed_length = find_fixedlength(last_branch, options, FALSE, cd);        fixed_length = find_fixedlength(last_branch,  (options & PCRE_UTF8) != 0,
6771            FALSE, cd);
6772        DPRINTF(("fixed length = %d\n", fixed_length));        DPRINTF(("fixed length = %d\n", fixed_length));
6773        if (fixed_length == -3)        if (fixed_length == -3)
6774          {          {
# Line 6424  for (;;) Line 6776  for (;;)
6776          }          }
6777        else if (fixed_length < 0)        else if (fixed_length < 0)
6778          {          {
6779          *errorcodeptr = (fixed_length == -2)? ERR36 : ERR25;          *errorcodeptr = (fixed_length == -2)? ERR36 :
6780                            (fixed_length == -4)? ERR70: ERR25;
6781          *ptrptr = ptr;          *ptrptr = ptr;
6782          return FALSE;          return FALSE;
6783          }          }
# Line 6437  for (;;) Line 6790  for (;;)
6790    of offsets, with the field in the BRA item now becoming an offset to the    of offsets, with the field in the BRA item now becoming an offset to the
6791    first alternative. If there are no alternatives, it points to the end of the    first alternative. If there are no alternatives, it points to the end of the
6792    group. The length in the terminating ket is always the length of the whole    group. The length in the terminating ket is always the length of the whole
6793    bracketed item. If any of the ims options were changed inside the group,    bracketed item. Return leaving the pointer at the terminating char. */
   compile a resetting op-code following, except at the very end of the pattern.  
   Return leaving the pointer at the terminating char. */  
6794    
6795    if (*ptr != CHAR_VERTICAL_LINE)    if (*ptr != CHAR_VERTICAL_LINE)
6796      {      {
# Line 6564  of the more common cases more precisely. Line 6915  of the more common cases more precisely.
6915    
6916  Arguments:  Arguments:
6917    code           points to start of expression (the bracket)    code           points to start of expression (the bracket)
   options        points to the options setting  
6918    bracket_map    a bitmap of which brackets we are inside while testing; this    bracket_map    a bitmap of which brackets we are inside while testing; this
6919                    handles up to substring 31; after that we just have to take                    handles up to substring 31; after that we just have to take
6920                    the less precise approach                    the less precise approach
# Line 6574  Returns: TRUE or FALSE Line 6924  Returns: TRUE or FALSE
6924  */  */
6925    
6926  static BOOL  static BOOL
6927  is_anchored(register const uschar *code, int *options, unsigned int bracket_map,  is_anchored(register const uschar *code, unsigned int bracket_map,
6928    unsigned int backref_map)    unsigned int backref_map)
6929  {  {
6930  do {  do {
6931     const uschar *scode = first_significant_code(code + _pcre_OP_lengths[*code],     const uschar *scode = first_significant_code(code + _pcre_OP_lengths[*code],
6932       options, PCRE_MULTILINE, FALSE);       FALSE);
6933     register int op = *scode;     register int op = *scode;
6934    
6935     /* Non-capturing brackets */     /* Non-capturing brackets */
6936    
6937     if (op == OP_BRA)     if (op == OP_BRA  || op == OP_BRAPOS ||
6938           op == OP_SBRA || op == OP_SBRAPOS)
6939       {       {
6940       if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE;       if (!is_anchored(scode, bracket_map, backref_map)) return FALSE;
6941       }       }
6942    
6943     /* Capturing brackets */     /* Capturing brackets */
6944    
6945     else if (op == OP_CBRA)     else if (op == OP_CBRA  || op == OP_CBRAPOS ||
6946                op == OP_SCBRA || op == OP_SCBRAPOS)
6947       {       {
6948       int n = GET2(scode, 1+LINK_SIZE);       int n = GET2(scode, 1+LINK_SIZE);
6949       int new_map = bracket_map | ((n < 32)? (1 << n) : 1);       int new_map = bracket_map | ((n < 32)? (1 << n) : 1);
6950       if (!is_anchored(scode, options, new_map, backref_map)) return FALSE;       if (!is_anchored(scode, new_map, backref_map)) return FALSE;
6951       }       }
6952    
6953     /* Other brackets */     /* Other brackets */
6954    
6955     else if (op == OP_ASSERT || op == OP_ONCE || op == OP_COND)     else if (op == OP_ASSERT || op == OP_ONCE || op == OP_ONCE_NC ||
6956                op == OP_COND)
6957       {       {
6958       if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE;       if (!is_anchored(scode, bracket_map, backref_map)) return FALSE;
6959       }       }
6960    
6961     /* .* is not anchored unless DOTALL is set (which generates OP_ALLANY) and     /* .* is not anchored unless DOTALL is set (which generates OP_ALLANY) and
# Line 6653  is_startline(const uschar *code, unsigne Line 7006  is_startline(const uschar *code, unsigne
7006  {  {
7007  do {  do {
7008     const uschar *scode = first_significant_code(code + _pcre_OP_lengths[*code],     const uschar *scode = first_significant_code(code + _pcre_OP_lengths[*code],
7009       NULL, 0, FALSE);       FALSE);
7010     register int op = *scode;     register int op = *scode;
7011    
7012     /* If we are at the start of a conditional assertion group, *both* the     /* If we are at the start of a conditional assertion group, *both* the
# Line 6680  do { Line 7033  do {
7033         scode += 1 + LINK_SIZE;         scode += 1 + LINK_SIZE;
7034         break;         break;
7035         }         }
7036       scode = first_significant_code(scode, NULL, 0, FALSE);       scode = first_significant_code(scode, FALSE);
7037       op = *scode;       op = *scode;
7038       }       }
7039    
7040     /* Non-capturing brackets */     /* Non-capturing brackets */
7041    
7042     if (op == OP_BRA)     if (op == OP_BRA  || op == OP_BRAPOS ||
7043           op == OP_SBRA || op == OP_SBRAPOS)
7044       {       {
7045       if (!is_startline(scode, bracket_map, backref_map)) return FALSE;       if (!is_startline(scode, bracket_map, backref_map)) return FALSE;
7046       }       }
7047    
7048     /* Capturing brackets */     /* Capturing brackets */
7049    
7050     else if (op == OP_CBRA)     else if (op == OP_CBRA  || op == OP_CBRAPOS ||
7051                op == OP_SCBRA || op == OP_SCBRAPOS)
7052       {       {
7053       int n = GET2(scode, 1+LINK_SIZE);       int n = GET2(scode, 1+LINK_SIZE);
7054       int new_map = bracket_map | ((n < 32)? (1 << n) : 1);       int new_map = bracket_map | ((n < 32)? (1 << n) : 1);
# Line 6702  do { Line 7057  do {
7057    
7058     /* Other brackets */     /* Other brackets */
7059    
7060     else if (op == OP_ASSERT || op == OP_ONCE)     else if (op == OP_ASSERT || op == OP_ONCE || op == OP_ONCE_NC)
7061       {       {
7062       if (!is_startline(scode, bracket_map, backref_map)) return FALSE;       if (!is_startline(scode, bracket_map, backref_map)) return FALSE;
7063       }       }
# Line 6743  we return that char, otherwise -1. Line 7098  we return that char, otherwise -1.
7098    
7099  Arguments:  Arguments:
7100    code       points to start of expression (the bracket)    code       points to start of expression (the bracket)
   options    pointer to the options (used to check casing changes)  
7101    inassert   TRUE if in an assertion    inassert   TRUE if in an assertion
7102    
7103  Returns:     -1 or the fixed first char  Returns:     -1 or the fixed first char
7104  */  */
7105    
7106  static int  static int
7107  find_firstassertedchar(const uschar *code, int *options, BOOL inassert)  find_firstassertedchar(const uschar *code, BOOL inassert)
7108  {  {
7109  register int c = -1;  register int c = -1;
7110  do {  do {
7111     int d;     int d;
7112     const uschar *scode =     int xl = (*code == OP_CBRA || *code == OP_SCBRA ||
7113       first_significant_code(code + 1+LINK_SIZE, options, PCRE_CASELESS, TRUE);               *code == OP_CBRAPOS || *code == OP_SCBRAPOS)? 2:0;
7114       const uschar *scode = first_significant_code(code + 1+LINK_SIZE + xl, TRUE);
7115     register int op = *scode;     register int op = *scode;
7116    
7117     switch(op)     switch(op)
# Line 6765  do { Line 7120  do {
7120       return -1;       return -1;
7121    
7122       case OP_BRA:       case OP_BRA:
7123         case OP_BRAPOS:
7124       case OP_CBRA:       case OP_CBRA:
7125         case OP_SCBRA:
7126         case OP_CBRAPOS:
7127         case OP_SCBRAPOS:
7128       case OP_ASSERT:       case OP_ASSERT:
7129       case OP_ONCE:       case OP_ONCE:
7130         case OP_ONCE_NC:
7131       case OP_COND:       case OP_COND:
7132       if ((d = find_firstassertedchar(scode, options, op == OP_ASSERT)) < 0)       if ((d = find_firstassertedchar(scode, op == OP_ASSERT)) < 0)
7133         return -1;         return -1;
7134       if (c < 0) c = d; else if (c != d) return -1;       if (c < 0) c = d; else if (c != d) return -1;
7135       break;       break;
7136    
7137       case OP_EXACT:       /* Fall through */       case OP_EXACT:
7138       scode += 2;       scode += 2;
7139         /* Fall through */
7140    
7141       case OP_CHAR:       case OP_CHAR:
      case OP_CHARI:  
7142       case OP_PLUS:       case OP_PLUS:
7143       case OP_MINPLUS:       case OP_MINPLUS:
7144       case OP_POSPLUS:       case OP_POSPLUS:
7145       if (!inassert) return -1;       if (!inassert) return -1;
7146       if (c < 0)       if (c < 0) c = scode[1];
7147         {         else if (c != scode[1]) return -1;
7148         c = scode[1];       break;
7149         if ((*options & PCRE_CASELESS) != 0) c |= REQ_CASELESS;  
7150         }       case OP_EXACTI:
7151       else if (c != scode[1]) return -1;       scode += 2;
7152         /* Fall through */
7153    
7154         case OP_CHARI:
7155         case OP_PLUSI:
7156         case OP_MINPLUSI:
7157         case OP_POSPLUSI:
7158         if (!inassert) return -1;
7159         if (c < 0) c = scode[1] | REQ_CASELESS;
7160           else if (c != scode[1]) return -1;
7161       break;       break;
7162       }       }
7163    
# Line 6939  while (ptr[skipatstart] == CHAR_LEFT_PAR Line 7308  while (ptr[skipatstart] == CHAR_LEFT_PAR
7308    
7309  utf8 = (options & PCRE_UTF8) != 0;  utf8 = (options & PCRE_UTF8) != 0;
7310    
7311  /* 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
7312  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
7313  release 8.13. The only use we make of it here is to adjust the offset value to  release 8.13. It is passed back from pcre_[dfa_]exec(), but at the moment is
7314  the end of the string for a short string error, for compatibility with previous  not used here. */
 versions. */  
7315    
7316  #ifdef SUPPORT_UTF8  #ifdef SUPPORT_UTF8
7317  if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0 &&  if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0 &&
7318       (*erroroffset = _pcre_valid_utf8((USPTR)pattern, -1, &errorcode)) >= 0)       (errorcode = _pcre_valid_utf8((USPTR)pattern, -1, erroroffset)) != 0)
7319    {    {
7320    errorcode = ERR44;    errorcode = ERR44;
7321    goto PCRE_EARLY_ERROR_RETURN2;    goto PCRE_EARLY_ERROR_RETURN2;
# Line 6972  if ((options & PCRE_UCP) != 0) Line 7340  if ((options & PCRE_UCP) != 0)
7340    
7341  /* Check validity of \R options. */  /* Check validity of \R options. */
7342    
7343  switch (options & (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE))  if ((options & (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)) ==
7344         (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE))
7345    {    {
7346    case 0:    errorcode = ERR56;
7347    case PCRE_BSR_ANYCRLF:    goto PCRE_EARLY_ERROR_RETURN;
   case PCRE_BSR_UNICODE:  
   break;  
   default: errorcode = ERR56; goto PCRE_EARLY_ERROR_RETURN;  
7348    }    }
7349    
7350  /* Handle different types of newline. The three bits give seven cases. The  /* Handle different types of newline. The three bits give seven cases. The
# Line 7063  outside can help speed up starting point Line 7429  outside can help speed up starting point
7429  ptr += skipatstart;  ptr += skipatstart;
7430  code = cworkspace;  code = cworkspace;
7431  *code = OP_BRA;  *code = OP_BRA;
7432  (void)compile_regex(cd->external_options, cd->external_options & PCRE_IMS,  (void)compile_regex(cd->external_options, &code, &ptr, &errorcode, FALSE,
7433    &code, &ptr, &errorcode, FALSE, FALSE, 0, &firstbyte, &reqbyte, NULL, cd,    FALSE, 0, 0, &firstbyte, &reqbyte, NULL, cd, &length);
   &length);  
7434  if (errorcode != 0) goto PCRE_EARLY_ERROR_RETURN;  if (errorcode != 0) goto PCRE_EARLY_ERROR_RETURN;
7435    
7436  DPRINTF(("end pre-compile: length=%d workspace=%d\n", length,  DPRINTF(("end pre-compile: length=%d workspace=%d\n", length,
# Line 7119  field; this time it's used for rememberi Line 7484  field; this time it's used for rememberi
7484  */  */
7485    
7486  cd->final_bracount = cd->bracount;  /* Save for checking forward references */  cd->final_bracount = cd->bracount;  /* Save for checking forward references */
7487    cd->assert_depth = 0;
7488  cd->bracount = 0;  cd->bracount = 0;
7489  cd->names_found = 0;  cd->names_found = 0;
7490  cd->name_table = (uschar *)re + re->name_table_offset;  cd->name_table = (uschar *)re + re->name_table_offset;
# Line 7137  of the function here. */ Line 7503  of the function here. */
7503  ptr = (const uschar *)pattern + skipatstart;  ptr = (const uschar *)pattern + skipatstart;
7504  code = (uschar *)codestart;  code = (uschar *)codestart;
7505  *code = OP_BRA;  *code = OP_BRA;
7506  (void)compile_regex(re->options, re->options & PCRE_IMS, &code, &ptr,  (void)compile_regex(re->options, &code, &ptr, &errorcode, FALSE, FALSE, 0, 0,
7507    &errorcode, FALSE, FALSE, 0, &firstbyte, &reqbyte, NULL, cd, NULL);    &firstbyte, &reqbyte, NULL, cd, NULL);
7508  re->top_bracket = cd->bracount;  re->top_bracket = cd->bracount;
7509  re->top_backref = cd->top_backref;  re->top_backref = cd->top_backref;
7510  re->flags = cd->external_flags;  re->flags = cd->external_flags;
7511    
7512  if (cd->had_accept) reqbyte = -1;   /* Must disable after (*ACCEPT) */  if (cd->had_accept) reqbyte = REQ_NONE;   /* Must disable after (*ACCEPT) */
7513    
7514  /* 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. */
7515    
# Line 7204  if (cd->check_lookbehind) Line 7570  if (cd->check_lookbehind)
7570        uschar *be = cc - 1 - LINK_SIZE + GET(cc, -LINK_SIZE);        uschar *be = cc - 1 - LINK_SIZE + GET(cc, -LINK_SIZE);
7571        int end_op = *be;        int end_op = *be;
7572        *be = OP_END;        *be = OP_END;
7573        fixed_length = find_fixedlength(cc, re->options, TRUE, cd);        fixed_length = find_fixedlength(cc, (re->options & PCRE_UTF8) != 0, TRUE,
7574            cd);
7575        *be = end_op;        *be = end_op;
7576        DPRINTF(("fixed length = %d\n", fixed_length));        DPRINTF(("fixed length = %d\n", fixed_length));
7577        if (fixed_length < 0)        if (fixed_length < 0)
7578          {          {
7579          errorcode = (fixed_length == -2)? ERR36 : ERR25;          errorcode = (fixed_length == -2)? ERR36 :
7580                        (fixed_length == -4)? ERR70 : ERR25;
7581          break;          break;
7582          }          }
7583        PUT(cc, 1, fixed_length);        PUT(cc, 1, fixed_length);
# Line 7243  start with ^. and also when all branches Line 7611  start with ^. and also when all branches
7611    
7612  if ((re->options & PCRE_ANCHORED) == 0)  if ((re->options & PCRE_ANCHORED) == 0)
7613    {    {
7614    int temp_options = re->options;   /* May get changed during these scans */    if (is_anchored(codestart, 0, cd->backref_map))
   if (is_anchored(codestart, &temp_options, 0, cd->backref_map))  
7615      re->options |= PCRE_ANCHORED;      re->options |= PCRE_ANCHORED;
7616    else    else
7617      {      {
7618      if (firstbyte < 0)      if (firstbyte < 0)
7619        firstbyte = find_firstassertedchar(codestart, &temp_options, FALSE);        firstbyte = find_firstassertedchar(codestart, FALSE);
7620      if (firstbyte >= 0)   /* Remove caseless flag for non-caseable chars */      if (firstbyte >= 0)   /* Remove caseless flag for non-caseable chars */
7621        {        {
7622        int ch = firstbyte & 255;        int ch = firstbyte & 255;
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