New "re" regular expression support.
This code is written by Philip Hazel and Andrew Kuchling.
It requires a new "re.py" module, too.
diff --git a/Modules/pypcre.c b/Modules/pypcre.c
new file mode 100644
index 0000000..9b4b8ee
--- /dev/null
+++ b/Modules/pypcre.c
@@ -0,0 +1,4075 @@
+
+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/* DO NOT EDIT THIS FILE! */
+
+/* This file is automatically written by the merge-files.py script
+included with the PCRE distribution for Python; it's produced from
+several C files, and code is removed in the process. If you want to
+modify the code or track down bugs, it will be much easier to work
+with the code in its original, multiple-file form. Don't edit this
+file by hand, or submit patches to it.
+
+The Python-specific PCRE distribution can be retrieved from
+ http://starship.skyport.net/crew/amk/regex/
+
+The unmodified original PCRE distribution doesn't have a fixed URL
+yet; write Philip Hazel <ph10@cam.ac.uk> for the latest version.
+
+Written by: Philip Hazel <ph10@cam.ac.uk>
+
+Extensively modified by the Python String-SIG: <string-sig@python.org>
+Send bug reports to: <string-sig@python.org>
+(They'll figure out if it's a bug in PCRE or in the Python-specific
+changes.)
+
+ Copyright (c) 1997 University of Cambridge
+
+-----------------------------------------------------------------------------
+Permission is granted to anyone to use this software for any purpose on any
+computer system, and to redistribute it freely, subject to the following
+restrictions:
+
+1. This software is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+2. The origin of this software must not be misrepresented, either by
+ explicit claim or by omission.
+
+3. Altered versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+-----------------------------------------------------------------------------
+*/
+
+
+#define FOR_PYTHON
+#include "pcre-internal.h"
+#include "Python.h"
+#include "graminit.h"
+
+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/* This file is automatically written by the makechartables auxiliary
+program. If you edit it by hand, you might like to edit the Makefile to
+prevent its ever being regenerated. */
+
+/* This table is a lower casing table. */
+
+unsigned char pcre_lcc[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+ 64, 97, 98, 99,100,101,102,103,
+ 104,105,106,107,108,109,110,111,
+ 112,113,114,115,116,117,118,119,
+ 120,121,122, 91, 92, 93, 94, 95,
+ 96, 97, 98, 99,100,101,102,103,
+ 104,105,106,107,108,109,110,111,
+ 112,113,114,115,116,117,118,119,
+ 120,121,122,123,124,125,126,127,
+ 128,129,130,131,132,133,134,135,
+ 136,137,138,139,140,141,142,143,
+ 144,145,146,147,148,149,150,151,
+ 152,153,154,155,156,157,158,159,
+ 160,161,162,163,164,165,166,167,
+ 168,169,170,171,172,173,174,175,
+ 176,177,178,179,180,181,182,183,
+ 184,185,186,187,188,189,190,191,
+ 192,193,194,195,196,197,198,199,
+ 200,201,202,203,204,205,206,207,
+ 208,209,210,211,212,213,214,215,
+ 216,217,218,219,220,221,222,223,
+ 224,225,226,227,228,229,230,231,
+ 232,233,234,235,236,237,238,239,
+ 240,241,242,243,244,245,246,247,
+ 248,249,250,251,252,253,254,255 };
+
+/* This table is an upper casing table. */
+
+unsigned char pcre_ucc[] = {
+ 0, 1, 2, 3, 4, 5, 6, 7,
+ 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23,
+ 24, 25, 26, 27, 28, 29, 30, 31,
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63,
+ 64, 65, 66, 67, 68, 69, 70, 71,
+ 72, 73, 74, 75, 76, 77, 78, 79,
+ 80, 81, 82, 83, 84, 85, 86, 87,
+ 88, 89, 90, 91, 92, 93, 94, 95,
+ 96, 65, 66, 67, 68, 69, 70, 71,
+ 72, 73, 74, 75, 76, 77, 78, 79,
+ 80, 81, 82, 83, 84, 85, 86, 87,
+ 88, 89, 90,123,124,125,126,127,
+ 128,129,130,131,132,133,134,135,
+ 136,137,138,139,140,141,142,143,
+ 144,145,146,147,148,149,150,151,
+ 152,153,154,155,156,157,158,159,
+ 160,161,162,163,164,165,166,167,
+ 168,169,170,171,172,173,174,175,
+ 176,177,178,179,180,181,182,183,
+ 184,185,186,187,188,189,190,191,
+ 192,193,194,195,196,197,198,199,
+ 200,201,202,203,204,205,206,207,
+ 208,209,210,211,212,213,214,215,
+ 216,217,218,219,220,221,222,223,
+ 224,225,226,227,228,229,230,231,
+ 232,233,234,235,236,237,238,239,
+ 240,241,242,243,244,245,246,247,
+ 248,249,250,251,252,253,254,255 };
+
+/* This table identifies various classes of character by individual bits:
+ 1 white space character
+ 2 decimal digit
+ 4 hexadecimal digit
+ 8 alphanumeric or '_'
+ 16 octal digit
+ 128 regular expression metacharacter or binary zero
+*/
+
+unsigned char pcre_ctypes[] = {
+ 0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 */
+ 0x00,0x01,0x01,0x01,0x01,0x01,0x00,0x00, /* 8- 15 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
+ 0x01,0x00,0x00,0x00,0x80,0x00,0x00,0x00, /* - ' */
+ 0x80,0x80,0x80,0x80,0x00,0x00,0x80,0x00, /* ( - / */
+ 0x1e,0x1e,0x1e,0x1e,0x1e,0x1e,0x1e,0x1e, /* 0 - 7 */
+ 0x0e,0x0e,0x00,0x00,0x00,0x00,0x00,0x80, /* 8 - ? */
+ 0x00,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x08, /* @ - G */
+ 0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08, /* H - O */
+ 0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08, /* P - W */
+ 0x08,0x08,0x08,0x80,0x00,0x00,0x80,0x08, /* X - _ */
+ 0x00,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x08, /* ` - g */
+ 0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08, /* h - o */
+ 0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08, /* p - w */
+ 0x08,0x08,0x08,0x80,0x80,0x00,0x00,0x00, /* x -127 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 128-135 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 136-143 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144-151 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 152-159 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160-167 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 168-175 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 176-183 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 192-199 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 200-207 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 208-215 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 216-223 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 224-231 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 232-239 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 240-247 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};/* 248-255 */
+
+/* End of pcre-chartables.c */
+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/*
+This is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language.
+
+Written by: Philip Hazel <ph10@cam.ac.uk>
+
+ Copyright (c) 1997 University of Cambridge
+
+-----------------------------------------------------------------------------
+Permission is granted to anyone to use this software for any purpose on any
+computer system, and to redistribute it freely, subject to the following
+restrictions:
+
+1. This software is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+2. The origin of this software must not be misrepresented, either by
+ explicit claim or by omission.
+
+3. Altered versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+-----------------------------------------------------------------------------
+
+See the file Tech.Notes for some information on the internals.
+*/
+
+/* This module contains the actual definition of global variables that are
+shared between the different modules. In fact, these are limited to the
+indirections for memory management functions. */
+
+/* Include the internals header, which itself includes Standard C headers plus
+the external pcre header. */
+
+
+/* Store get and free functions. */
+
+void *(*pcre_malloc)(size_t) = malloc;
+void (*pcre_free)(void *) = free;
+
+/* End of pcre-globals.c */
+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/*
+This is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language. See
+the file Tech.Notes for some information on the internals.
+
+Written by: Philip Hazel <ph10@cam.ac.uk>
+
+ Copyright (c) 1997 University of Cambridge
+
+-----------------------------------------------------------------------------
+Permission is granted to anyone to use this software for any purpose on any
+computer system, and to redistribute it freely, subject to the following
+restrictions:
+
+1. This software is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+2. The origin of this software must not be misrepresented, either by
+ explicit claim or by omission.
+
+3. Altered versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+-----------------------------------------------------------------------------
+*/
+
+
+/* Include the internals header, which itself includes Standard C headers plus
+the external pcre header. */
+
+
+
+/* Character types for class type bits */
+
+static char class_types[] = { ctype_digit, ctype_space, ctype_word };
+
+
+
+/*************************************************
+* Set a range of bits in the map *
+*************************************************/
+
+/* This function is called for character types.
+
+Arguments:
+ start_bits points to the bit map
+ type a character type bit
+ include TRUE to include the type;
+ FALSE to include all but the type
+
+Returns: nothing
+*/
+
+static void
+set_type_bits(uschar *start_bits, int type, BOOL include)
+{
+int i;
+for (i = 0; i < 256; i++)
+ if (((pcre_ctypes[i] & type) != 0) == include) start_bits[i/8] |= (1<<(i%8));
+}
+
+
+
+/*************************************************
+* Set one bit in the map *
+*************************************************/
+
+/* This function is called to set a bit in the map for a given character,
+or both cases of a letter if caseless. It could be replaced by a macro if
+better performance is wanted.
+
+Arguments:
+ start_bits points to 32-byte table
+ c the character
+ caseless TRUE if caseless
+
+Returns: nothing
+*/
+
+static void
+set_bit(uschar *start_bits, int c, BOOL caseless)
+{
+if (caseless)
+ {
+ int d = pcre_ucc[c];
+ start_bits[d/8] |= (1<<(d%8));
+ c = pcre_lcc[c];
+ }
+start_bits[c/8] |= (1<<(c%8));
+}
+
+
+
+/*************************************************
+* Create bitmap of starting chars *
+*************************************************/
+
+/* This function scans a compiled unanchored expression and attempts to build a
+bitmap of the set of initial characters. If it can't, it returns FALSE. As time
+goes by, we may be able to get more clever at doing this.
+
+Arguments:
+ code points to an expression
+ start_bits points to a 32-byte table, initialized to 0
+ caseless TRUE if caseless
+
+Returns: TRUE if table built, FALSE otherwise
+*/
+
+static BOOL
+set_start_bits(uschar *code, uschar *start_bits, BOOL caseless)
+{
+do
+ {
+ uschar *tcode = code + 3;
+ BOOL try_next = TRUE;
+
+ while (try_next)
+ {
+ try_next = FALSE;
+
+ if ((int)*tcode >= OP_BRA || *tcode == OP_ASSERT)
+ {
+ if (!set_start_bits(tcode, start_bits, caseless)) return FALSE;
+ }
+
+ else switch(*tcode)
+ {
+ default:
+ return FALSE;
+
+ /* BRAZERO does the bracket, but carries on. */
+
+ case OP_BRAZERO:
+ case OP_BRAMINZERO:
+ if (!set_start_bits(++tcode, start_bits, caseless)) return FALSE;
+ do tcode += (tcode[1] << 8) + tcode[2]; while (*tcode == OP_ALT);
+ tcode += 3;
+ try_next = TRUE;
+ break;
+
+ /* Single-char * or ? sets the bit and tries the next item */
+
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ set_bit(start_bits, tcode[1], caseless);
+ tcode += 2;
+ try_next = TRUE;
+ break;
+
+ /* Single-char upto sets the bit and tries the next */
+
+ case OP_UPTO:
+ case OP_MINUPTO:
+ set_bit(start_bits, tcode[3], caseless);
+ tcode += 4;
+ try_next = TRUE;
+ break;
+
+ /* At least one single char sets the bit and stops */
+
+ case OP_EXACT: /* Fall through */
+ tcode++;
+
+ case OP_CHARS: /* Fall through */
+ tcode++;
+
+ case OP_PLUS:
+ case OP_MINPLUS:
+ set_bit(start_bits, tcode[1], caseless);
+ break;
+
+ /* Single character type sets the bits and stops */
+
+ case OP_NOT_DIGIT:
+ set_type_bits(start_bits, ctype_digit, FALSE);
+ break;
+
+ case OP_DIGIT:
+ set_type_bits(start_bits, ctype_digit, TRUE);
+ break;
+
+ case OP_NOT_WHITESPACE:
+ set_type_bits(start_bits, ctype_space, FALSE);
+ break;
+
+ case OP_WHITESPACE:
+ set_type_bits(start_bits, ctype_space, TRUE);
+ break;
+
+ case OP_NOT_WORDCHAR:
+ set_type_bits(start_bits, ctype_word, FALSE);
+ break;
+
+ case OP_WORDCHAR:
+ set_type_bits(start_bits, ctype_word, TRUE);
+ break;
+
+ /* One or more character type fudges the pointer and restarts, knowing
+ it will hit a single character type and stop there. */
+
+ case OP_TYPEPLUS:
+ case OP_TYPEMINPLUS:
+ tcode++;
+ try_next = TRUE;
+ break;
+
+ case OP_TYPEEXACT:
+ tcode += 3;
+ try_next = TRUE;
+ break;
+
+ /* Zero or more repeats of character types set the bits and then
+ try again. */
+
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ tcode += 2; /* Fall through */
+
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ switch(tcode[1])
+ {
+ case OP_NOT_DIGIT:
+ set_type_bits(start_bits, ctype_digit, FALSE);
+ break;
+
+ case OP_DIGIT:
+ set_type_bits(start_bits, ctype_digit, TRUE);
+ break;
+
+ case OP_NOT_WHITESPACE:
+ set_type_bits(start_bits, ctype_space, FALSE);
+ break;
+
+ case OP_WHITESPACE:
+ set_type_bits(start_bits, ctype_space, TRUE);
+ break;
+
+ case OP_NOT_WORDCHAR:
+ set_type_bits(start_bits, ctype_word, FALSE);
+ break;
+
+ case OP_WORDCHAR:
+ set_type_bits(start_bits, ctype_word, TRUE);
+ break;
+ }
+
+ tcode += 2;
+ try_next = TRUE;
+ break;
+
+ /* Character class: set the bits and either carry on or not,
+ according to the repeat count. */
+
+ case OP_CLASS:
+ case OP_NEGCLASS:
+ {
+ uschar *base = tcode;
+ uschar *data, *end;
+ uschar *bitmap = start_bits;
+ uschar local[32];
+ int flags = base[1];
+ int i;
+
+ tcode += 4 + 2 * tcode[2] + tcode[3]; /* Advance past the item */
+ switch (*tcode)
+ {
+ case OP_CRSTAR:
+ case OP_CRMINSTAR:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ tcode++;
+ try_next = TRUE;
+ break;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ if (((tcode[1] << 8) + tcode[2]) == 0)
+ {
+ tcode += 5;
+ try_next = TRUE;
+ }
+ break;
+ }
+
+ /* For a negated class, we have to build a separate table of all
+ the bits in the class, and then turn all other bits on in the main
+ table. Otherwise there are problems with things like [^\da]. */
+
+ if (*base == OP_NEGCLASS)
+ {
+ memset(local, 0, 32);
+ bitmap = local;
+ }
+
+ /* Character types */
+
+ for (i = 0; flags != 0; i++)
+ {
+ if ((flags & 1) != 0)
+ set_type_bits(bitmap, class_types[i/2], (i & 1) == 0);
+ flags >>= 1;
+ }
+
+ /* Ranges and individual characters */
+
+ data = base + 4;
+ end = data + base[2] * 2;
+ while (data < end)
+ {
+ for (i = *data; i <= data[1]; i++) set_bit(bitmap, i, caseless);
+ data += 2;
+ }
+
+ end += base[3];
+ while (data < end) set_bit(bitmap, *data++, caseless);
+
+ /* If a negated class, transfer data from local map to the main one */
+
+ if (bitmap != start_bits)
+ for (i = 0; i < 32; i++) start_bits[i] |= ~local[i];
+ }
+ break; /* End of class handling */
+
+ } /* End of switch */
+ } /* End of try_next loop */
+
+ code += (code[1] << 8) + code[2]; /* Advance to next branch */
+ }
+while (*code == OP_ALT);
+return TRUE;
+}
+
+
+
+/*************************************************
+* Study a compiled expression *
+*************************************************/
+
+/* This function is handed a compiled expression that it must study to produce
+information that will speed up the matching. It returns a pcre_extra block
+which then gets handed back to pcre_exec().
+
+Arguments:
+ re points to the compiled expression
+ options contains option bits
+ errorptr points to where to place error messages;
+ set NULL unless error
+
+Returns: pointer to a pcre_extra block,
+ NULL on error or if no optimization possible
+*/
+
+pcre_extra *
+pcre_study(pcre *external_re, int options, char **errorptr)
+{
+BOOL caseless;
+uschar start_bits[32];
+real_pcre_extra *extra;
+real_pcre *re = (real_pcre *)external_re;
+
+*errorptr = NULL;
+
+if (re == NULL || re->magic_number != MAGIC_NUMBER)
+ {
+ *errorptr = "argument is not a compiled regular expression";
+ return NULL;
+ }
+
+if ((options & ~PUBLIC_STUDY_OPTIONS) != 0)
+ {
+ *errorptr = "unknown or incorrect option bit(s) set";
+ return NULL;
+ }
+
+/* For an anchored pattern, or an unchored pattern that has a first char, or a
+multiline pattern that matches only at "line starts", no further processing at
+present. */
+
+if ((re->options & (PCRE_ANCHORED|PCRE_FIRSTSET|PCRE_STARTLINE)) != 0)
+ return NULL;
+
+/* Determine the caseless state from the compiled pattern and the current
+options. */
+
+caseless = ((re->options | options) & PCRE_CASELESS) != 0;
+
+/* See if we can find a fixed set of initial characters for the pattern. */
+
+memset(start_bits, 0, 32);
+if (!set_start_bits(re->code, start_bits, caseless)) return NULL;
+
+/* Get an "extra" block and put the information therein. */
+
+extra = (real_pcre_extra *)(pcre_malloc)(sizeof(real_pcre_extra));
+
+if (extra == NULL)
+ {
+ *errorptr = "failed to get memory";
+ return NULL;
+ }
+extra->options = PCRE_STUDY_MAPPED | (caseless? PCRE_STUDY_CASELESS : 0);
+memcpy(extra->start_bits, start_bits, 32);
+
+return (pcre_extra *)extra;
+}
+
+/* End of pcre-study.c */
+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/*
+This is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language. See
+the file Tech.Notes for some information on the internals.
+
+Written by: Philip Hazel <ph10@cam.ac.uk>
+
+ Copyright (c) 1997 University of Cambridge
+
+-----------------------------------------------------------------------------
+Permission is granted to anyone to use this software for any purpose on any
+computer system, and to redistribute it freely, subject to the following
+restrictions:
+
+1. This software is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+2. The origin of this software must not be misrepresented, either by
+ explicit claim or by omission.
+
+3. Altered versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+-----------------------------------------------------------------------------
+*/
+
+
+/* Define DEBUG to get debugging output on stdout. */
+
+/* #define DEBUG */
+
+
+/* Include the internals header, which itself includes Standard C headers plus
+the external pcre header. */
+
+
+#ifndef Py_eval_input
+/* For Python 1.4, graminit.h has to be explicitly included */
+#define Py_eval_input eval_input
+#endif
+
+/* Min and max values for the common repeats; for the maxima, 0 => infinity */
+
+static char rep_min[] = { 0, 0, 1, 1, 0, 0 };
+static char rep_max[] = { 0, 0, 0, 0, 1, 1 };
+
+/* Text forms of OP_ values and things, for debugging */
+
+#ifdef DEBUG
+static char *OP_names[] = { "End", "\\A", "\\B", "\\b", "\\D", "\\d",
+ "\\S", "\\s", "\\W", "\\w", "\\Z", "^", "$", "Any", "chars",
+ "*", "*?", "+", "+?", "?", "??", "{", "{", "{",
+ "*", "*?", "+", "+?", "?", "??", "{", "{", "{",
+ "*", "*?", "+", "+?", "?", "??", "{", "{",
+ "class", "negclass", "Ref",
+ "Alt", "Ket", "KetRmax", "KetRmin", "Assert", "Assert not",
+ "Brazero", "Braminzero", "Bra"
+};
+
+static char *class_names[] = { "\\d", "\\D", "\\s", "\\S", "\\w", "\\W" };
+#endif
+
+/* Table of character type operators that correspond to the bits in the
+character class flags, starting at the least significant end. */
+
+static char class_ops[] = {
+ OP_DIGIT, OP_NOT_DIGIT,
+ OP_WHITESPACE, OP_NOT_WHITESPACE,
+ OP_WORDCHAR, OP_NOT_WORDCHAR };
+
+/* Table for handling escaped characters in the range '0'-'z'. Positive returns
+are simple data values; negative values are for special things like \d and so
+on. Zero means further processing is needed (for things like \x), or the escape
+is invalid. */
+
+/* PYTHON: Python doesn't support \e, but does support \v */
+
+static short int escapes[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 0 - 7 */
+ 0, 0, ':', ';', '<', '=', '>', '?', /* 8 - ? */
+ '@', -ESC_A, -ESC_B, 0, -ESC_D, 0, 0, 0, /* @ - G */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
+ 0, 0, 0, -ESC_S, 0, 0, 0, -ESC_W, /* P - W */
+ 0, 0, -ESC_Z, '[', '\\', ']', '^', '_', /* X - _ */
+ '`', 7, -ESC_b, 0, -ESC_d, 0, '\f', 0, /* ` - g */
+ 0, 0, 0, 0, 0, 0, '\n', 0, /* h - o */
+ 0, 0, '\r', -ESC_s, '\t', 0, '\v', -ESC_w, /* p - w */
+ 0, 0, 0 /* x - z */
+};
+
+
+/* Definition to allow mutual recursion */
+
+static BOOL compile_regexp(BOOL, int *, uschar **, uschar **,
+ char **, PyObject *);
+
+/* Structure for passing "static" information around between the functions
+doing the matching, so that they are thread-safe. */
+
+typedef struct match_data {
+ int errorcode; /* As it says */
+ int *offset_vector; /* Offset vector */
+ int offset_end; /* One past the end */
+ BOOL offset_overflow; /* Set if too many extractions */
+ BOOL caseless; /* Case-independent flag */
+ BOOL multiline; /* Multiline flag */
+ uschar *start_subject; /* Start of the subject string */
+ uschar *end_subject; /* End of the subject string */
+
+ uschar *end_match_ptr; /* Subject position at end match */
+ int end_offset_top; /* Highwater mark at end of match */
+ BOOL dotall; /* Dotall flag */
+ int length; /* Length of the allocated stacks */
+ int point; /* Point to add next item pushed onto stacks */
+ /* Pointers to the 6 stacks */
+ int *off_num, *offset_top, *r1, *r2;
+ uschar **eptr, **ecode;
+} match_data;
+
+
+
+/*************************************************
+* Return version string *
+*************************************************/
+
+char *
+pcre_version(void)
+{
+return PCRE_VERSION;
+}
+
+
+
+
+/*************************************************
+* Return info about a compiled pattern *
+*************************************************/
+
+/* This function picks potentially useful data out of the private
+structure.
+
+Arguments:
+ external_re points to compiled code
+ optptr where to pass back the options
+ first_char where to pass back the first character,
+ or -1 if multiline and all branches start ^,
+ or -2 otherwise
+
+Returns: number of identifying extraction brackets
+ or negative values on error
+*/
+
+int
+pcre_info(pcre *external_re, int *optptr, int *first_char)
+{
+real_pcre *re = (real_pcre *)external_re;
+if (re == NULL) return PCRE_ERROR_NULL;
+if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC;
+if (optptr != NULL) *optptr = (re->options & PUBLIC_OPTIONS);
+if (first_char != NULL)
+ *first_char = ((re->options & PCRE_FIRSTSET) != 0)? re->first_char :
+ ((re->options & PCRE_STARTLINE) != 0)? -1 : -2;
+return re->top_bracket;
+}
+
+
+
+
+#ifdef DEBUG
+/*************************************************
+* Debugging function to print chars *
+*************************************************/
+
+/* Print a sequence of chars in printable format, stopping at the end of the
+subject if the requested.
+
+Arguments:
+ p points to characters
+ length number to print
+ is_subject TRUE if printing from within md->start_subject
+ md pointer to matching data block, if is_subject is TRUE
+
+Returns: nothing
+*/
+
+static pchars(uschar *p, int length, BOOL is_subject, match_data *md)
+{
+int c;
+if (is_subject && length > md->end_subject - p) length = md->end_subject - p;
+while (length-- > 0)
+ if (isprint(c = *(p++))) printf("%c", c); else printf("\\x%02x", c);
+}
+#endif
+
+
+
+
+/*************************************************
+* Check subpattern for empty operand *
+*************************************************/
+
+/* This function checks a bracketed subpattern to see if any of the paths
+through it could match an empty string. This is used to diagnose an error if
+such a subpattern is followed by a quantifier with an unlimited upper bound.
+
+Argument:
+ code points to the opening bracket
+
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+could_be_empty(uschar *code)
+{
+do {
+ uschar *cc = code + 3;
+
+ /* Scan along the opcodes for this branch; as soon as we find something
+ that matches a non-empty string, break out and advance to test the next
+ branch. If we get to the end of the branch, return TRUE for the whole
+ sub-expression. */
+
+ for (;;)
+ {
+ /* Test an embedded subpattern; if it could not be empty, break the
+ loop. Otherwise carry on in the branch. */
+
+ if ((int)(*cc) >= OP_BRA)
+ {
+ if (!could_be_empty(cc)) break;
+ do cc += (cc[1] << 8) + cc[2]; while (*cc == OP_ALT);
+ cc += 3;
+ }
+
+ else switch (*cc)
+ {
+ /* Reached end of a branch: the subpattern may match the empty string */
+
+ case OP_ALT:
+ case OP_KET:
+ case OP_KETRMAX:
+ case OP_KETRMIN:
+ return TRUE;
+
+ /* Skip over assertive subpatterns */
+
+ case OP_ASSERT:
+ case OP_ASSERT_NOT:
+ do cc += (cc[1] << 8) + cc[2]; while (*cc == OP_ALT);
+ cc += 3;
+ break;
+
+ /* Skip over things that don't match chars */
+
+ case OP_SOD:
+ case OP_EOD:
+ case OP_CIRC:
+ case OP_DOLL:
+ case OP_BRAZERO:
+ case OP_BRAMINZERO:
+ case OP_NOT_WORD_BOUNDARY:
+ case OP_WORD_BOUNDARY:
+ cc++;
+ break;
+
+ /* Skip over simple repeats with zero lower bound */
+
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ cc += 2;
+ break;
+
+ /* Skip over UPTOs (lower bound is zero) */
+
+ case OP_UPTO:
+ case OP_MINUPTO:
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ cc += 4;
+ break;
+
+ /* Check a class or a back reference for a zero minimum */
+
+ case OP_CLASS:
+ case OP_NEGCLASS:
+ case OP_REF:
+ cc += (*cc == OP_REF)? 2 : 4 + 2 * cc[2] + cc[3];
+
+ switch (*cc)
+ {
+ case OP_CRSTAR:
+ case OP_CRMINSTAR:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ cc++;
+ break;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ if ((cc[1] << 8) + cc[2] != 0) goto NEXT_BRANCH;
+ cc += 3;
+ break;
+
+ default:
+ goto NEXT_BRANCH;
+ }
+ break;
+
+ /* Anything else matches at least one character */
+
+ default:
+ goto NEXT_BRANCH;
+ }
+ }
+
+ NEXT_BRANCH:
+ code += (code[1] << 8) + code[2];
+ }
+while (*code == OP_ALT);
+
+/* No branches match the empty string */
+
+return FALSE;
+}
+
+
+/* Determine the length of a group ID in an expression like
+ (?P<foo_123>...)
+Arguments:
+ ptr pattern position pointer (say that 3 times fast)
+ finalchar the character that will mark the end of the ID
+ errorptr points to the pointer to the error message
+*/
+
+static int
+get_group_id(uschar *ptr, char finalchar, char **errorptr)
+{
+ uschar *start = ptr;
+
+ /* If the first character is not in \w, or is in \w but is a digit,
+ report an error */
+ if (!(pcre_ctypes[*ptr] & ctype_word) ||
+ (pcre_ctypes[*ptr++] & ctype_digit))
+ {
+ *errorptr = "(?P identifier must start with a letter or underscore";
+ return 0;
+ }
+
+ /* Increment ptr until we either hit a null byte, the desired
+ final character, or a non-word character */
+ for(; (*ptr != 0) && (*ptr != finalchar) &&
+ (pcre_ctypes[*ptr] & ctype_word); ptr++)
+ {
+ }
+ if (*ptr==finalchar)
+ return ptr-start;
+ if (*ptr==0)
+ {
+ *errorptr = "unterminated (?P identifier";
+ return 0;
+ }
+ *errorptr = "illegal character in (?P identifier";
+ return 0;
+}
+
+/*************************************************
+* Handle escapes *
+*************************************************/
+
+/* This function is called when a \ has been encountered. It either returns a
+positive value for a simple escape such as \n, or a negative value which
+encodes one of the more complicated things such as \d. On entry, ptr is
+pointing at the \. On exit, it is on the final character of the escape
+sequence.
+
+Arguments:
+ ptrptr points to the pattern position pointer
+ errorptr points to the pointer to the error message
+
+Returns: zero or positive => a data character
+ negative => a special escape sequence
+ on error, errorptr is set
+*/
+
+static int
+check_escape(uschar **ptrptr, char **errorptr)
+{
+uschar *ptr = *ptrptr;
+int c = *(++ptr) & 255; /* Ensure > 0 on signed-char systems */
+int i;
+
+if (c == 0) *errorptr = "\\ at end of pattern";
+
+/* Digits or letters may have special meaning; all others are literals. */
+
+else if (c < '0' || c > 'z') {}
+
+/* Do an initial lookup in a table. A non-zero result is something that can be
+returned immediately. Otherwise further processing may be required. */
+
+else if ((i = escapes[c - '0']) != 0) c = i;
+
+/* Escapes that need further processing, or are illegal. */
+
+else switch (c)
+ {
+ case '0':
+ c = 0;
+ while(i++ < 2 && (pcre_ctypes[ptr[1]] & ctype_odigit) != 0 )
+ c = c * 8 + *(++ptr) - '0';
+ break;
+
+ case '1': case '2': case '3': case '4': case '5':
+ case '6': case '7': case '8': case '9':
+ {
+ /* PYTHON: Try to compute an octal value for a character */
+ for(c=0, i=0; c!=-1 && ptr[i]!=0 && i<3; i++)
+ {
+ if (( pcre_ctypes[ ptr[i] ] & ctype_odigit) != 0)
+ c = c * 8 + ptr[i]-'0';
+ else
+ c = -1; /* Non-octal character */
+ }
+ /* Aha! There were 3 octal digits, so it must be a character */
+ if (c != -1 && i == 3)
+ {
+ ptr += i-1;
+ break;
+ }
+ c = ptr[0]; /* Restore the first character after the \ */
+ c -= '0'; i = 1;
+ while (i<2 && (pcre_ctypes[ptr[1]] & ctype_digit) != 0)
+ {
+ c = c * 10 + ptr[1] - '0';
+ ptr++; i++;
+ }
+ if (c > 255 - ESC_REF) *errorptr = "back reference too big";
+ c = -(ESC_REF + c);
+ }
+ break;
+
+ case 'x':
+ {
+ int end, length;
+ char *string;
+ PyObject *v, *result;
+
+ i=1;
+ while (ptr[i]!=0 &&
+ ( pcre_ctypes[ptr[i]] & ctype_xdigit) != 0)
+ i++;
+ if (i==1)
+ {
+ *errorptr="\\x must be followed by hex digits";
+ break;
+ }
+ length=i-1;
+ string=malloc(length+4+1);
+ if (string==NULL)
+ {
+ *errorptr="can't allocate memory for \\x string";
+ break;
+ }
+ /* Create a string containing "\x<hexdigits>", which will be
+ passed to eval() */
+ string[0]=string[length+3]='"';
+ string[1]='\\';
+ string[length+4]='\0';
+ memcpy(string+2, ptr, length+1);
+ ptr += length;
+ v=PyRun_String((char *)string, Py_eval_input,
+ PyEval_GetGlobals(), PyEval_GetLocals());
+ free(string);
+ /* The evaluation raised an exception */
+ if (v==NULL)
+ {
+ *errorptr="exception occurred during evaluation of \\x";
+ break;
+ }
+ if (PyString_Size(v)!=1)
+ {
+ Py_DECREF(v);
+ *errorptr="\\x string is not one byte in length";
+ break;
+ }
+ c=*(unsigned char *)PyString_AsString(v);
+ Py_DECREF(v);
+ break;
+ }
+ break;
+
+
+ case 'l':
+ case 'L':
+ case 'u':
+ case 'U':
+ case 'Q':
+ case 'E':
+ *errorptr = "the Perl escapes \\u, \\U, \\l, \\L, \\Q, \\E are not valid";
+ break;
+
+ default:
+ /* In Python, an unrecognized escape will simply return the character
+ after the backslash, so do nothing */
+ break;
+ }
+
+*ptrptr = ptr;
+return c;
+}
+
+
+
+/*************************************************
+* Read repeat counts *
+*************************************************/
+
+/* Read an item of the form {n,m} and return the values.
+
+Arguments:
+ p pointer to first char after '{'
+ minp pointer to int for min
+ maxp pointer to int for max
+ returned as -1 if no max
+ errorptr points to pointer to error message
+
+Returns: pointer to '}' on success;
+ current ptr on error, with errorptr set
+*/
+
+static uschar *
+read_repeat_counts(uschar *p, int *minp, int *maxp, char **errorptr)
+{
+int min = 0;
+int max = -1;
+
+if ((pcre_ctypes[*p] & ctype_digit) == 0)
+ {
+ *errorptr = "number expected after {";
+ return p;
+ }
+
+while ((pcre_ctypes[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0';
+
+if (*p == '}') max = min; else
+ {
+ if (*p++ != ',')
+ {
+ *errorptr = "comma expected";
+ return p-1;
+ }
+ if (*p != '}')
+ {
+ max = 0;
+ while((pcre_ctypes[*p] & ctype_digit) != 0) max = max * 10 + *p++ - '0';
+ if (*p != '}')
+ {
+ *errorptr = "} expected";
+ return p;
+ }
+ if (max < min)
+ {
+ *errorptr = "numbers out of order";
+ return p;
+ }
+ }
+ }
+
+/* Do paranoid checks, then fill in the required variables, and pass back the
+pointer to the terminating '}'. */
+
+if (max == 0) *errorptr = "zero maximum not allowed";
+else if (min > 65535 || max > 65535) *errorptr = "number too big";
+else
+ {
+ *minp = min;
+ *maxp = max;
+ }
+return p;
+}
+
+
+
+/*************************************************
+* Compile one branch *
+*************************************************/
+
+/* Scan the pattern, compiling it into the code vector.
+
+Arguments:
+ extended TRUE if the PCRE_EXTENDED option was set
+ brackets points to 2-element bracket vector
+ code points to the pointer to the current code point
+ ptrptr points to the current pattern pointer
+ errorptr points to pointer to error message
+
+Returns: TRUE on success
+ FALSE, with *errorptr set on error
+*/
+
+static BOOL
+compile_branch(BOOL extended, int *brackets, uschar **codeptr,
+ uschar **ptrptr, char **errorptr, PyObject *dictionary)
+{
+int repeat_type, op_type;
+int repeat_min, repeat_max;
+int bravalue, length;
+register int c;
+register uschar *code = *codeptr;
+uschar *ptr = *ptrptr;
+uschar *previous = NULL;
+uschar *oldptr;
+
+/* Switch on next character until the end of the branch */
+
+for (;; ptr++)
+ {
+ c = *ptr;
+ if (extended)
+ {
+ if ((pcre_ctypes[c] & ctype_space) != 0) continue;
+ if (c == '#')
+ {
+ while ((c = *(++ptr)) != 0 && c != '\n');
+ continue;
+ }
+ }
+
+ switch(c)
+ {
+ /* The branch terminates at end of string, |, or ). */
+
+ case 0:
+ case '|':
+ case ')':
+ *codeptr = code;
+ *ptrptr = ptr;
+ return TRUE;
+
+ /* Handle single-character metacharacters */
+
+ case '^':
+ previous = NULL;
+ *code++ = OP_CIRC;
+ break;
+
+ case '$':
+ previous = NULL;
+ *code++ = OP_DOLL;
+ break;
+
+ case '.':
+ previous = code;
+ *code++ = OP_ANY;
+ break;
+
+ /* Character classes. We do quite a bit of munging around here. There are
+ always four initial bytes: the op_code, a flags byte for things like \d, a
+ count of pairs and a count of single characters. The pairs then follow, and
+ finally the single characters. */
+
+ case '[':
+ {
+ int rangecount = 0;
+ int flags = 0;
+ int singles_count = 0;
+ char singles[256];
+
+ previous = code;
+
+ /* If the first character is '^', set the negation flag */
+
+ if ((c = *(++ptr)) == '^') { *code = OP_NEGCLASS; c = *(++ptr); }
+ else *code = OP_CLASS;
+ code += 4;
+
+ /* Process characters until ] is reached. By writing this as a "do" it
+ means that an initial ] is taken as a data character. */
+
+ do
+ {
+ if (c == 0)
+ {
+ *errorptr = "] missing";
+ goto FAILED;
+ }
+
+ /*** Perl treats '-' here as a data character, so PCRE had better
+ do the same ... cut out this diagnosis.
+
+ if (c == '-')
+ {
+ *errorptr = "unexpected '-' in character class";
+ goto FAILED;
+ }
+ ... ***/
+
+ /* Backslash may introduce a single character, or it may introduce one
+ of the specials, which just set a flag. Escaped items are checked for
+ validity in the pre-compiling pass. The sequence \b is a special case.
+ Inside a class (and only there) it is treated as backslash. Elsewhere
+ it marks a word boundary. */
+
+ if (c == '\\')
+ {
+ uschar *save_ptr = ptr+1;
+ c = check_escape(&ptr, errorptr);
+ if (c < 0)
+ {
+ switch (-c)
+ {
+ case ESC_d: flags |= CLASS_DIGITS; continue;
+ case ESC_D: flags |= CLASS_NOT_DIGITS; continue;
+ case ESC_s: flags |= CLASS_WHITESPACE; continue;
+ case ESC_S: flags |= CLASS_NOT_WHITESPACE; continue;
+ case ESC_w: flags |= CLASS_WORD; continue;
+ case ESC_W: flags |= CLASS_NOT_WORD; continue;
+ default:
+ ptr = save_ptr;
+ c = *ptr;
+ break;
+
+ case ESC_b: c = '\b'; /* Treat as single character */
+ break;
+ }
+ }
+ /* Fall through if single character */
+ }
+
+ /* A single character may be followed by '-' to form a range. However,
+ Perl does not permit ']' to be the end of the range. A '-' character
+ here is treated as a literal. */
+
+ if (ptr[1] == '-' && ptr[2] != ']')
+ {
+ int d;
+ ptr += 2;
+ d = *ptr;
+
+ if (d == 0)
+ {
+ *errorptr = "incomplete range";
+ goto FAILED;
+ }
+
+ /* The second part of a range can be a single-character escape, but
+ not any of the other escapes. */
+
+ if (d == '\\')
+ {
+ d = check_escape(&ptr, errorptr);
+ if (d < 0)
+ {
+ if (d == -ESC_b) d = '\b'; else
+ {
+ *errorptr = "invalid range";
+ goto FAILED;
+ }
+ }
+ }
+
+ if (d < c)
+ {
+ *errorptr = "range out of order";
+ goto FAILED;
+ }
+
+ if (rangecount >= 255)
+ {
+ *errorptr = "too many ranges inside []";
+ goto FAILED;
+ }
+
+ rangecount++;
+ *code++ = c;
+ *code++ = d;
+ continue;
+ }
+
+ /* Handle a lone single character: save it up for outputting at the
+ end. Be paranoid and check that the buffer isn't going to overflow. */
+
+ if (singles_count >= 255)
+ {
+ *errorptr = "too many characters inside []";
+ goto FAILED;
+ }
+ singles[singles_count++] = c;
+ }
+
+ /* Loop until ']' reached; the check for end of string happens inside the
+ loop. This "while" is the end of the "do" above. */
+
+ while ((c = *(++ptr)) != ']');
+
+ /* Copy saved single characters, which follow the ranges in the output. */
+
+ c = 0;
+ while (c < singles_count) *code++ = singles[c++];
+
+ /* Finally fill in the flags and counts of ranges and single characters,
+ and advance the pointer past the ]. */
+
+ previous[1] = flags;
+ previous[2] = rangecount;
+ previous[3] = singles_count;
+ }
+ break;
+
+ /* Various kinds of repeat */
+
+ case '{':
+ ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorptr);
+ if (*errorptr != NULL) goto FAILED;
+ goto REPEAT;
+
+ case '*':
+ repeat_min = 0;
+ repeat_max = -1;
+ goto REPEAT;
+
+ case '+':
+ repeat_min = 1;
+ repeat_max = -1;
+ goto REPEAT;
+
+ case '?':
+ repeat_min = 0;
+ repeat_max = 1;
+
+ REPEAT:
+ if (previous == NULL)
+ {
+ *errorptr = "nothing to repeat";
+ goto FAILED;
+ }
+
+ /* If the next character is '?' this is a minimizing repeat. Advance to the
+ next character. */
+
+ if (ptr[1] == '?') { repeat_type = 1; ptr++; } else repeat_type = 0;
+
+ /* If previous was a string of characters, chop off the last one and use it
+ as the subject of the repeat. If there was only one character, we can
+ abolish the previous item altogether. */
+
+ if (*previous == OP_CHARS)
+ {
+ int len = previous[1];
+ if (len == 1)
+ {
+ c = previous[2];
+ code = previous;
+ }
+ else
+ {
+ c = previous[len+1];
+ previous[1]--;
+ code--;
+ }
+ op_type = 0; /* Use single-char op codes */
+ goto OUTPUT_SINGLE_REPEAT; /* Code shared with single character types */
+ }
+
+ /* If previous was a character type match (\d or similar), abolish it and
+ create a suitable repeat item. The code is shared with single-character
+ repeats by adding a suitable offset into repeat_type. */
+
+ if ((int)*previous < OP_EOD || *previous == OP_ANY)
+ {
+ op_type = OP_TYPESTAR - OP_STAR; /* Use type opcodes */
+ c = *previous;
+ code = previous;
+
+ OUTPUT_SINGLE_REPEAT:
+ repeat_type += op_type; /* Combine both values for many cases */
+
+ /* A minimum of zero is handled either as the special case * or ?, or as
+ an UPTO, with the maximum given. */
+
+ if (repeat_min == 0)
+ {
+ if (repeat_max == -1) *code++ = OP_STAR + repeat_type;
+ else if (repeat_max == 1) *code++ = OP_QUERY + repeat_type;
+ else
+ {
+ *code++ = OP_UPTO + repeat_type;
+ *code++ = repeat_max >> 8;
+ *code++ = (repeat_max & 255);
+ }
+ }
+
+ /* The case {1,} is handled as the special case + */
+
+ else if (repeat_min == 1 && repeat_max == -1)
+ *code++ = OP_PLUS + repeat_type;
+
+ /* The case {n,n} is just an EXACT, while the general case {n,m} is
+ handled as an EXACT followed by an UPTO. An EXACT of 1 is optimized. */
+
+ else
+ {
+ if (repeat_min != 1)
+ {
+ *code++ = OP_EXACT + op_type; /* NB EXACT doesn't have repeat_type */
+ *code++ = repeat_min >> 8;
+ *code++ = (repeat_min & 255);
+ }
+
+ /* If the mininum is 1 and the previous item was a character string,
+ we either have to put back the item that got cancelled if the string
+ length was 1, or add the character back onto the end of a longer
+ string. For a character type nothing need be done; it will just get put
+ back naturally. */
+
+ else if (*previous == OP_CHARS)
+ {
+ if (code == previous) code += 2; else previous[1]++;
+ }
+
+ /* Insert an UPTO if the max is greater than the min. */
+
+ if (repeat_max != repeat_min)
+ {
+ *code++ = c;
+ repeat_max -= repeat_min;
+ *code++ = OP_UPTO + repeat_type;
+ *code++ = repeat_max >> 8;
+ *code++ = (repeat_max & 255);
+ }
+ }
+
+ /* The character or character type itself comes last in all cases. */
+
+ *code++ = c;
+ }
+
+ /* If previous was a character class or a back reference, we put the repeat
+ stuff after it. */
+
+ else if (*previous == OP_CLASS || *previous == OP_NEGCLASS ||
+ *previous == OP_REF)
+ {
+ if (repeat_min == 0 && repeat_max == -1)
+ *code++ = OP_CRSTAR + repeat_type;
+ else if (repeat_min == 1 && repeat_max == -1)
+ *code++ = OP_CRPLUS + repeat_type;
+ else if (repeat_min == 0 && repeat_max == 1)
+ *code++ = OP_CRQUERY + repeat_type;
+ else
+ {
+ *code++ = OP_CRRANGE + repeat_type;
+ *code++ = repeat_min >> 8;
+ *code++ = repeat_min & 255;
+ if (repeat_max == -1) repeat_max = 0; /* 2-byte encoding for max */
+ *code++ = repeat_max >> 8;
+ *code++ = repeat_max & 255;
+ }
+ }
+
+ /* If previous was a bracket group, we may have to replicate it in certain
+ cases. If the maximum repeat count is unlimited, check that the bracket
+ group cannot match the empty string, and diagnose an error if it can. */
+
+ else if ((int)*previous >= OP_BRA)
+ {
+ int i;
+ int length = code - previous;
+
+ if (repeat_max == -1 && could_be_empty(previous))
+ {
+ *errorptr = "operand of unlimited repeat could match the empty string";
+ goto FAILED;
+ }
+
+ /* If the minimum is greater than zero, and the maximum is unlimited or
+ equal to the minimum, the first copy remains where it is, and is
+ replicated up to the minimum number of times. This case includes the +
+ repeat, but of course no replication is needed in that case. */
+
+ if (repeat_min > 0 && (repeat_max == -1 || repeat_max == repeat_min))
+ {
+ for (i = 1; i < repeat_min; i++)
+ {
+ memcpy(code, previous, length);
+ code += length;
+ }
+ }
+
+ /* If the minimum is zero, stick BRAZERO in front of the first copy.
+ Then, if there is a fixed upper limit, replicated up to that many times,
+ sticking BRAZERO in front of all the optional ones. */
+
+ else
+ {
+ if (repeat_min == 0)
+ {
+ memmove(previous+1, previous, length);
+ code++;
+ *previous++ = OP_BRAZERO + repeat_type;
+ }
+
+ for (i = 1; i < repeat_min; i++)
+ {
+ memcpy(code, previous, length);
+ code += length;
+ }
+
+ for (i = (repeat_min > 0)? repeat_min : 1; i < repeat_max; i++)
+ {
+ *code++ = OP_BRAZERO + repeat_type;
+ memcpy(code, previous, length);
+ code += length;
+ }
+ }
+
+ /* If the maximum is unlimited, set a repeater in the final copy. */
+
+ if (repeat_max == -1) code[-3] = OP_KETRMAX + repeat_type;
+ }
+
+ /* Else there's some kind of shambles */
+
+ else
+ {
+ *errorptr = "internal error 1 (unexpected repeat)";
+ goto FAILED;
+ }
+
+ /* In all case we no longer have a previous item. */
+
+ previous = NULL;
+ break;
+
+
+ /* Start of nested bracket sub-expression, or comment or lookahead.
+ First deal with special things that can come after a bracket; all are
+ introduced by ?, and the appearance of any of them means that this is not a
+ referencing group. They were checked for validity in the first pass over
+ the string, so we don't have to check for syntax errors here. */
+
+ case '(':
+ previous = code; /* Only real brackets can be repeated */
+ if (*(++ptr) == '?')
+ {
+ bravalue = OP_BRA;
+
+ switch (*(++ptr))
+ {
+ case '#':
+ case 'i':
+ case 'm':
+ case 's':
+ case 'x':
+ ptr++;
+ while (*ptr != ')') ptr++;
+ previous = NULL;
+ continue;
+
+ case ':': /* Non-extracting bracket */
+ ptr++;
+ break;
+
+ case '=': /* Assertions can't be repeated */
+ bravalue = OP_ASSERT;
+ ptr++;
+ previous = NULL;
+ break;
+
+ case '!':
+ bravalue = OP_ASSERT_NOT;
+ ptr++;
+ previous = NULL;
+ break;
+
+ case ('P'):
+ ptr++;
+ if (*ptr=='<')
+ {
+ /* (?P<groupname>...) */
+ int idlen;
+ PyObject *string, *intobj;
+
+ ptr++;
+ idlen = get_group_id(ptr, '>', errorptr);
+ if (*errorptr) {
+ goto FAILED;
+ }
+ string = PyString_FromStringAndSize(ptr, idlen);
+ intobj = PyInt_FromLong( brackets[0] );
+ if (intobj == NULL || string==NULL)
+ {
+ Py_XDECREF(string);
+ Py_XDECREF(intobj);
+ *errorptr = "exception raised";
+ goto FAILED;
+ }
+ PyDict_SetItem(dictionary, string, intobj);
+ Py_DECREF(string); Py_DECREF(intobj);
+ ptr += idlen+1; /* Point to rest of expression */
+ goto do_grouping_bracket;
+ }
+ if (*ptr=='=')
+ {
+ /* (?P=groupname) */
+ int idlen, refnum;
+ PyObject *string, *intobj;
+
+ ptr++;
+ idlen = get_group_id(ptr, ')', errorptr);
+ if (*errorptr) {
+ goto FAILED;
+ }
+ string = PyString_FromStringAndSize(ptr, idlen);
+ if (string==NULL)
+ {
+ Py_XDECREF(string);
+ *errorptr = "exception raised";
+ goto FAILED;
+ }
+ intobj = PyDict_GetItem(dictionary, string);
+ if (intobj==NULL) {
+ *errorptr = "?P= group identifier isn't defined";
+ goto FAILED;
+ }
+
+ refnum = PyInt_AsLong(intobj);
+ Py_DECREF(string); Py_DECREF(intobj);
+ *code++ = OP_REF;
+ *code++ = refnum;
+ /* The continue will cause the top-level for() loop to
+ be resumed, so ptr will be immediately incremented.
+ Therefore, the following line adds just idlen, not
+ idlen+1 */
+ ptr += idlen;
+ continue;
+ }
+ /* The character after ?P is neither < nor =, so
+ report an error. Add more Python-extensions here. */
+ *errorptr="unknown after (?P";
+ goto FAILED;
+ break;
+ default:
+ *errorptr = "unknown after (?";
+ goto FAILED;
+ }
+ }
+
+ /* Else we have a referencing group */
+
+ else
+ {
+ do_grouping_bracket:
+ if (brackets[0] > EXTRACT_MAX)
+ {
+ *errorptr = "too many extraction brackets";
+ goto FAILED;
+ }
+ brackets[1] = brackets[0];
+ bravalue = OP_BRA + brackets[0]++;
+ }
+
+ /* Process nested bracketed re; at end pointer is on the bracket. We copy
+ code into a non-register variable in order to be able to pass its address
+ because some compilers complain otherwise. */
+
+ *code = bravalue;
+ {
+ uschar *mcode = code;
+ if (!compile_regexp(extended, brackets, &mcode, &ptr, errorptr, dictionary))
+ goto FAILED;
+ code = mcode;
+ }
+
+ if (*ptr != ')')
+ {
+ *errorptr = "missing )";
+ goto FAILED;
+ }
+ break;
+
+ /* Check \ for being a real metacharacter; if not, fall through and handle
+ it as a data character at the start of a string. Escape items are checked
+ for validity in the pre-compiling pass. */
+
+ case '\\':
+ oldptr = ptr;
+ c = check_escape(&ptr, errorptr);
+
+ /* Handle metacharacters introduced by \. For ones like \d, the ESC_ values
+ are arranged to be the negation of the corresponding OP_values. For the
+ back references, the values are ESC_REF plus the reference number. Only
+ back references and those types that consume a character may be repeated.
+ We can test for values between ESC_b and ESC_Z for the latter; this may
+ have to change if any new ones are ever created. */
+
+ if (c < 0)
+ {
+ if (-c >= ESC_REF)
+ {
+ int refnum = -c -ESC_REF;
+ if (brackets[1] < refnum ) {
+ *errorptr = "backreference to non-existent group";
+ goto FAILED;
+ }
+ previous = code;
+ *code++ = OP_REF;
+ *code++ = refnum;
+ }
+ else
+ {
+ previous = (-c > ESC_b && -c < ESC_Z)? code : NULL;
+ *code++ = -c;
+ }
+ continue;
+ }
+
+ /* Reset and fall through */
+
+ ptr = oldptr;
+ c = '\\';
+
+ /* Handle a run of data characters until a metacharacter is encountered.
+ The first character is guaranteed not to be whitespace or # when the
+ extended flag is set. */
+
+ default:
+ previous = code;
+ *code = OP_CHARS;
+ code += 2;
+ length = 0;
+
+ do
+ {
+ if (extended)
+ {
+ if ((pcre_ctypes[c] & ctype_space) != 0) continue;
+ if (c == '#')
+ {
+ while ((c = *(++ptr)) != 0 && c != '\n');
+ if (c == 0) break;
+ continue;
+ }
+ }
+
+ /* Backslash may introduce a data char or a metacharacter. Escaped items
+ are checked for validity in the pre-compiling pass. Stop the string
+ before a metaitem. */
+
+ if (c == '\\')
+ {
+ oldptr = ptr;
+ c = check_escape(&ptr, errorptr);
+ if (c < 0) { ptr = oldptr; break; }
+ }
+
+ /* Ordinary character or single-char escape */
+
+ *code++ = c;
+ length++;
+ }
+
+ /* This "while" is the end of the "do" above. */
+
+ while (length < 255 && (pcre_ctypes[c = *(++ptr)] & ctype_meta) == 0);
+
+ /* Compute the length and set it in the data vector, and advance to
+ the next state. */
+
+ previous[1] = length;
+ ptr--;
+ break;
+ }
+ } /* end of big loop */
+
+/* Control never reaches here by falling through, only by a goto for all the
+error states. Pass back the position in the pattern so that it can be displayed
+to the user for diagnosing the error. */
+
+FAILED:
+*ptrptr = ptr;
+return FALSE;
+}
+
+
+
+
+/*************************************************
+* Compile sequence of alternatives *
+*************************************************/
+
+/* On entry, ptr is pointing past the bracket character, but on return
+it points to the closing bracket, or vertical bar, or end of string.
+The code variable is pointing at the byte into which the BRA operator has been
+stored.
+
+Argument:
+ extended TRUE if PCRE_EXTENDED was set
+ brackets -> 2-element vector containing next and top bracket numbers
+ codeptr -> the address of the current code pointer
+ ptrptr -> the address of the current pattern pointer
+ errorptr -> pointer to error message
+
+Returns: TRUE on success
+*/
+
+static BOOL
+compile_regexp(BOOL extended, int *brackets, uschar **codeptr,
+ uschar **ptrptr, char **errorptr, PyObject *dictionary)
+{
+uschar *ptr = *ptrptr;
+uschar *code = *codeptr;
+uschar *start_bracket = code;
+
+for (;;)
+ {
+ int length;
+ uschar *last_branch = code;
+
+ code += 3;
+ if (!compile_branch(extended, brackets, &code, &ptr, errorptr, dictionary))
+ {
+ *ptrptr = ptr;
+ return FALSE;
+ }
+
+ /* Fill in the length of the last branch */
+
+ length = code - last_branch;
+ last_branch[1] = length >> 8;
+ last_branch[2] = length & 255;
+
+ /* Reached end of expression, either ')' or end of pattern. Insert a
+ terminating ket and the length of the whole bracketed item, and return,
+ leaving the pointer at the terminating char. */
+
+ if (*ptr != '|')
+ {
+ length = code - start_bracket;
+ *code++ = OP_KET;
+ *code++ = length >> 8;
+ *code++ = length & 255;
+ *codeptr = code;
+ *ptrptr = ptr;
+ return TRUE;
+ }
+
+ /* Another branch follows; insert an "or" node and advance the pointer. */
+
+ *code = OP_ALT;
+ ptr++;
+ }
+/* Control never reaches here */
+}
+
+
+
+/*************************************************
+* Check for anchored expression *
+*************************************************/
+
+/* Try to find out if this is an anchored regular expression. Consider each
+alternative branch. If they all start with OP_SOD or OP_CIRC, or with a bracket
+all of whose alternatives start with OP_SOD or OP_CIRC (recurse ad lib), then
+it's anchored. However, if this is a multiline pattern, then only OP_SOD
+counts, since OP_CIRC can match in the middle.
+
+A branch is also implicitly anchored if it starts with .* because that will try
+the rest of the pattern at all possible matching points, so there is no point
+trying them again.
+
+Argument: points to start of expression (the bracket)
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+is_anchored(register uschar *code, BOOL multiline)
+{
+do {
+ int op = (int)code[3];
+ if (op >= OP_BRA || op == OP_ASSERT)
+ { if (!is_anchored(code+3, multiline)) return FALSE; }
+ else if (op == OP_TYPESTAR || op == OP_TYPEMINSTAR)
+ { if (code[4] != OP_ANY) return FALSE; }
+ else if (op != OP_SOD && (multiline || op != OP_CIRC)) return FALSE;
+ code += (code[1] << 8) + code[2];
+ }
+while (*code == OP_ALT);
+return TRUE;
+}
+
+
+
+/*************************************************
+* Check for start with \n line expression *
+*************************************************/
+
+/* This is called for multiline expressions to try to find out if every branch
+starts with ^ so that "first char" processing can be done to speed things up.
+
+Argument: points to start of expression (the bracket)
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+is_startline(uschar *code)
+{
+do {
+ if ((int)code[3] >= OP_BRA || code[3] == OP_ASSERT)
+ { if (!is_startline(code+3)) return FALSE; }
+ else if (code[3] != OP_CIRC) return FALSE;
+ code += (code[1] << 8) + code[2];
+ }
+while (*code == OP_ALT);
+return TRUE;
+}
+
+
+
+/*************************************************
+* Check for fixed first char *
+*************************************************/
+
+/* Try to find out if there is a fixed first character. This is called for
+unanchored expressions, as it speeds up their processing quite considerably.
+Consider each alternative branch. If they all start with the same char, or with
+a bracket all of whose alternatives start with the same char (recurse ad lib),
+then we return that char, otherwise -1.
+
+Argument: points to start of expression (the bracket)
+Returns: -1 or the fixed first char
+*/
+
+static int
+find_firstchar(uschar *code)
+{
+register int c = -1;
+do
+ {
+ register int charoffset = 4;
+
+ if ((int)code[3] >= OP_BRA || code[3] == OP_ASSERT)
+ {
+ register int d;
+ if ((d = find_firstchar(code+3)) < 0) return -1;
+ if (c < 0) c = d; else if (c != d) return -1;
+ }
+
+ else switch(code[3])
+ {
+ default:
+ return -1;
+
+ case OP_EXACT: /* Fall through */
+ charoffset++;
+
+ case OP_CHARS: /* Fall through */
+ charoffset++;
+
+ case OP_PLUS:
+ case OP_MINPLUS:
+ if (c < 0) c = code[charoffset]; else if (c != code[charoffset]) return -1;
+ break;
+ }
+ code += (code[1] << 8) + code[2];
+ }
+while (*code == OP_ALT);
+return c;
+}
+
+
+
+/*************************************************
+* Compile a Regular Expression *
+*************************************************/
+
+/* This function takes a string and returns a pointer to a block of store
+holding a compiled version of the expression.
+
+Arguments:
+ pattern the regular expression
+ options various option bits
+ errorptr pointer to pointer to error text
+ erroroffset ptr offset in pattern where error was detected
+
+Returns: pointer to compiled data block, or NULL on error,
+ with errorptr and erroroffset set
+*/
+
+pcre *
+pcre_compile(char *pattern, int options, char **errorptr, int
+ *erroroffset, PyObject *dictionary)
+{
+real_pcre *re;
+int spaces = 0;
+int length = 3; /* For initial BRA plus length */
+int runlength;
+int c, size;
+int brackets[2];
+int brastack[200];
+int brastackptr = 0;
+BOOL extended = (options & PCRE_EXTENDED) != 0;
+uschar *code, *ptr;
+
+#ifdef DEBUG
+uschar *code_base, *code_end;
+#endif
+
+/* Miscellaneous initialization; the copy the error pointers into static
+variables so all functions can access them. */
+
+brackets[0] = 1; /* Next bracket number */
+brackets[1] = 0; /* Highest used bracket number */
+
+*errorptr = NULL;
+*erroroffset = 0;
+
+if ((options & ~PUBLIC_OPTIONS) != 0)
+ {
+ *errorptr = "unknown option bit(s) set";
+ return NULL;
+ }
+
+#ifdef DEBUG
+printf("------------------------------------------------------------------\n");
+printf("%s\n", pattern);
+#endif
+
+/* The first thing to do is to make a pass over the pattern to compute the
+amount of store required to hold the compiled code. This does not have to be
+perfect as long as errors are overestimates. At the same time we can detect any
+internal flag settings. Make an attempt to correct for any counted white space
+if an "extended" flag setting appears late in the pattern. We can't be so
+clever for #-comments. */
+
+ptr = (uschar *)(pattern - 1);
+while ((c = *(++ptr)) != 0)
+ {
+ int min, max;
+
+ if ((pcre_ctypes[c] & ctype_space) != 0)
+ {
+ if (extended) continue;
+ spaces++;
+ }
+
+ if (extended && c == '#')
+ {
+ while ((c = *(++ptr)) != 0 && c != '\n');
+ continue;
+ }
+
+ switch(c)
+ {
+ /* A backslashed item may be an escaped "normal" character or a
+ character type. For a "normal" character, put the pointers and
+ character back so that tests for whitespace etc. in the input
+ are done correctly. */
+
+ case '\\':
+ {
+ uschar *save_ptr = ptr;
+ c = check_escape(&ptr, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ if (c >= 0)
+ {
+ ptr = save_ptr;
+ c = '\\';
+ goto NORMAL_CHAR;
+ }
+ }
+ length++;
+
+ /* A back reference needs an additional char, plus either one or 5
+ bytes for a repeat. */
+
+ if (c <= -ESC_REF)
+ {
+ length++; /* For single back reference */
+ if (ptr[1] == '{')
+ {
+ ptr = read_repeat_counts(ptr+2, &min, &max, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ if ((min == 0 && (max == 1 || max == -1)) ||
+ (min == 1 && max == -1))
+ length++;
+ else length += 5;
+ if (ptr[1] == '?') ptr++;
+ }
+ }
+ continue;
+
+ case '^':
+ case '.':
+ case '$':
+ case '*': /* These repeats won't be after brackets; */
+ case '+': /* those are handled separately */
+ case '?':
+ length++;
+ continue;
+
+ /* This covers the cases of repeats after a single char, metachar, class,
+ or back reference. */
+
+ case '{':
+ ptr = read_repeat_counts(ptr+1, &min, &max, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ if ((min == 0 && (max == 1 || max == -1)) ||
+ (min == 1 && max == -1))
+ length++;
+ else
+ {
+ length--; /* Uncount the original char or metachar */
+ if (min == 1) length++; else if (min > 0) length += 4;
+ if (max > 0) length += 4; else length += 2;
+ }
+ if (ptr[1] == '?') ptr++;
+ continue;
+
+ /* An alternation contains an offset to the next branch or ket. */
+ case '|':
+ length += 3;
+ continue;
+
+ /* A character class uses 4 characters plus the characters in it. Don't
+ worry about character types that aren't allowed in classes - they'll get
+ picked up during the compile. */
+
+ case '[':
+ length += 4;
+ if (ptr[1] == '^') ptr++;
+ do
+ {
+ if (*(++ptr) == '\\')
+ {
+ (void)check_escape(&ptr, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ }
+ length++;
+ }
+ while (*ptr != 0 && *ptr != ']');
+
+ /* A repeat needs either 1 or 5 bytes. */
+
+ if (ptr[1] == '{')
+ {
+ ptr = read_repeat_counts(ptr+2, &min, &max, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ if ((min == 0 && (max == 1 || max == -1)) ||
+ (min == 1 && max == -1))
+ length++;
+ else length += 5;
+ if (ptr[1] == '?') ptr++;
+ }
+ continue;
+
+ /* Brackets may be genuine groups or special things */
+
+ case '(':
+
+ /* Handle special forms of bracket, which all start (? */
+
+ if (ptr[1] == '?') switch (c = ptr[2])
+ {
+ /* Skip over comments entirely */
+ case '#':
+ ptr += 3;
+ while (*ptr != 0 && *ptr != ')') ptr++;
+ if (*ptr == 0)
+ {
+ *errorptr = "missing ) after comment";
+ goto PCRE_ERROR_RETURN;
+ }
+ continue;
+
+ /* Non-referencing groups and lookaheads just move the pointer on, and
+ then behave like a non-special bracket. */
+
+ case ':':
+ case '=':
+ case '!':
+ ptr += 2;
+ break;
+
+ /* Else loop setting valid options until ) is met. Anything else is an
+ error. */
+
+ case ('P'):
+ {
+ int idlen;
+ switch (*ptr++) {
+ case ('<'):
+ idlen = get_group_id(ptr++, '>', errorptr);
+ if (*errorptr) goto PCRE_ERROR_RETURN;
+ ptr += idlen+1;
+ break;
+ case ('='):
+ idlen = get_group_id(ptr++, ')', errorptr);
+ if (*errorptr) goto PCRE_ERROR_RETURN;
+ ptr += idlen+1;
+ length++;
+ break;
+ }
+ }
+ break;
+
+ default:
+ ptr += 2;
+ for (;; ptr++)
+ {
+ if ((c = *ptr) == 'i')
+ {
+ options |= PCRE_CASELESS;
+ continue;
+ }
+ else if ((c = *ptr) == 'm')
+ {
+ options |= PCRE_MULTILINE;
+ continue;
+ }
+ else if ((c = *ptr) == 's')
+ {
+ options |= PCRE_DOTALL;
+ continue;
+ }
+ else if (c == 'x')
+ {
+ options |= PCRE_EXTENDED;
+ extended = TRUE;
+ length -= spaces; /* Already counted spaces */
+ continue;
+ }
+ else if (c == ')') break;
+
+ *errorptr = "undefined after (?";
+ goto PCRE_ERROR_RETURN;
+ }
+ continue; /* End of this bracket handling */
+ }
+
+ /* Non-special forms of bracket. Save length for computing whole length
+ at end if there's a repeat that requires duplication of the group. */
+
+ if (brastackptr >= sizeof(brastack)/sizeof(int))
+ {
+ *errorptr = "too many brackets";
+ goto PCRE_ERROR_RETURN;
+ }
+
+ brastack[brastackptr++] = length;
+ length += 3;
+ continue;
+
+ /* Handle ket. Look for subsequent max/min; for certain sets of values we
+ have to replicate this bracket up to that many times. */
+
+ case ')':
+ length += 3;
+ {
+ int min = 1;
+ int max = 1;
+ int duplength = length - brastack[--brastackptr];
+
+ /* Leave ptr at the final char; for read_repeat_counts this happens
+ automatically; for the others we need an increment. */
+
+ if ((c = ptr[1]) == '{')
+ {
+ ptr = read_repeat_counts(ptr+2, &min, &max, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ }
+ else if (c == '*') { min = 0; max = -1; ptr++; }
+ else if (c == '+') { max = -1; ptr++; }
+ else if (c == '?') { min = 0; ptr++; }
+
+ /* If there is a minimum > 1 we have to replicate up to min-1 times; if
+ there is a limited maximum we have to replicate up to max-1 times and
+ allow for a BRAZERO item before each optional copy, as we also have to
+ do before the first copy if the minimum is zero. */
+
+ if (min == 0) length++;
+ else if (min > 1) length += (min - 1) * duplength;
+ if (max > min) length += (max - min) * (duplength + 1);
+ }
+
+ continue;
+
+ /* Non-special character. For a run of such characters the length required
+ is the number of characters + 2, except that the maximum run length is 255.
+ We won't get a skipped space or a non-data escape or the start of a #
+ comment as the first character, so the length can't be zero. */
+
+ NORMAL_CHAR:
+ default:
+ length += 2;
+ runlength = 0;
+ do
+ {
+ if ((pcre_ctypes[c] & ctype_space) != 0)
+ {
+ if (extended) continue;
+ spaces++;
+ }
+
+ if (extended && c == '#')
+ {
+ while ((c = *(++ptr)) != 0 && c != '\n');
+ continue;
+ }
+
+ /* Backslash may introduce a data char or a metacharacter; stop the
+ string before the latter. */
+
+ if (c == '\\')
+ {
+ uschar *saveptr = ptr;
+ c = check_escape(&ptr, errorptr);
+ if (*errorptr != NULL) goto PCRE_ERROR_RETURN;
+ if (c < 0) { ptr = saveptr; break; }
+ }
+
+ /* Ordinary character or single-char escape */
+
+ runlength++;
+ }
+
+ /* This "while" is the end of the "do" above. */
+
+ while (runlength < 255 && (pcre_ctypes[c = *(++ptr)] & ctype_meta) == 0);
+
+ ptr--;
+ length += runlength;
+ continue;
+ }
+ }
+
+length += 4; /* For final KET and END */
+
+if (length > 65539)
+ {
+ *errorptr = "regular expression too large";
+ return NULL;
+ }
+
+/* Compute the size of data block needed and get it, either from malloc or
+externally provided function. Put in the magic number and the options. */
+
+size = length + sizeof(real_pcre) - sizeof(re->code);
+re = (real_pcre *)(pcre_malloc)(size);
+
+if (re == NULL)
+ {
+ *errorptr = "failed to get memory";
+ return NULL;
+ }
+
+re->magic_number = MAGIC_NUMBER;
+re->options = options;
+
+/* Set up a starting, non-extracting bracket, then compile the expression. On
+error, *errorptr will be set non-NULL, so we don't need to look at the result
+of the function here. */
+
+ptr = (uschar *)pattern;
+code = re->code;
+*code = OP_BRA;
+(void)compile_regexp(extended, brackets, &code, &ptr, errorptr, dictionary);
+re->top_bracket = brackets[1];
+
+/* If not reached end of pattern on success, there's an excess bracket. */
+
+if (*errorptr == NULL && *ptr != 0) *errorptr = "unmatched brackets";
+/* Fill in the terminating state and check for disastrous overflow, but
+if debugging, leave the test till after things are printed out. */
+
+*code++ = OP_END;
+
+#ifndef DEBUG
+if (code - re->code > length) *errorptr = "internal error: code overflow";
+#endif
+
+/* Failed to compile */
+
+if (*errorptr != NULL)
+ {
+ (pcre_free)(re);
+ PCRE_ERROR_RETURN:
+ *erroroffset = ptr - (uschar *)pattern;
+ return NULL;
+ }
+
+/* If the anchored option was not passed, set flag if we can determine that it
+is anchored by virtue of ^ characters or \A or anything else. Otherwise, see if
+we can determine what the first character has to be, because that speeds up
+unanchored matches no end. In the case of multiline matches, an alternative is
+to set the PCRE_STARTLINE flag if all branches start with ^. */
+
+if ((options & PCRE_ANCHORED) == 0)
+ {
+ if (is_anchored(re->code, (options & PCRE_MULTILINE) != 0))
+ re->options |= PCRE_ANCHORED;
+ else
+ {
+ int c = find_firstchar(re->code);
+ if (c >= 0)
+ {
+ re->first_char = c;
+ re->options |= PCRE_FIRSTSET;
+ }
+ else if (is_startline(re->code))
+ re->options |= PCRE_STARTLINE;
+ }
+ }
+
+/* Print out the compiled data for debugging */
+
+#ifdef DEBUG
+
+printf("Length = %d top_bracket = %d%s%s%s%s\n",
+ length, re->top_bracket,
+ ((re->options & PCRE_ANCHORED) != 0)? " anchored" : "",
+ ((re->options & PCRE_CASELESS) != 0)? " caseless" : "",
+ extended? " extended" : "",
+ ((re->options & PCRE_MULTILINE) != 0)? " multiline" : "");
+
+if ((re->options & PCRE_FIRSTSET) != 0)
+ {
+ if (isprint(re->first_char)) printf("First char = %c\n", re->first_char);
+ else printf("First char = \\x%02x\n", re->first_char);
+ }
+
+code_end = code;
+code_base = code = re->code;
+
+while (code < code_end)
+ {
+ int charlength;
+
+ printf("%3d ", code - code_base);
+
+ if (*code >= OP_BRA)
+ {
+ printf("%3d Bra %d", (code[1] << 8) + code[2], *code - OP_BRA);
+ code += 2;
+ }
+
+ else switch(*code)
+ {
+ case OP_CHARS:
+ charlength = *(++code);
+ printf("%3d ", charlength);
+ while (charlength-- > 0)
+ if (isprint(c = *(++code))) printf("%c", c); else printf("\\x%02x", c);
+ break;
+
+ case OP_KETRMAX:
+ case OP_KETRMIN:
+ case OP_ALT:
+ case OP_KET:
+ case OP_ASSERT:
+ case OP_ASSERT_NOT:
+ printf("%3d %s", (code[1] << 8) + code[2], OP_names[*code]);
+ code += 2;
+ break;
+
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEPLUS:
+ case OP_TYPEMINPLUS:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ if (*code >= OP_TYPESTAR)
+ printf(" %s", OP_names[code[1]]);
+ else if (isprint(c = code[1])) printf(" %c", c);
+ else printf(" \\x%02x", c);
+ printf("%s", OP_names[*code++]);
+ break;
+
+ case OP_EXACT:
+ case OP_UPTO:
+ case OP_MINUPTO:
+ if (isprint(c = code[3])) printf(" %c{", c);
+ else printf(" \\x%02x{", c);
+ if (*code != OP_EXACT) printf(",");
+ printf("%d}", (code[1] << 8) + code[2]);
+ if (*code == OP_MINUPTO) printf("?");
+ code += 3;
+ break;
+
+ case OP_TYPEEXACT:
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ printf(" %s{", OP_names[code[3]]);
+ if (*code != OP_TYPEEXACT) printf(",");
+ printf("%d}", (code[1] << 8) + code[2]);
+ if (*code == OP_TYPEMINUPTO) printf("?");
+ code += 3;
+ break;
+
+ case OP_REF:
+ printf(" \\%d", *(++code));
+ break;
+
+ case OP_CLASS:
+ case OP_NEGCLASS:
+ {
+ int i, min, max;
+ int flags = code[1];
+ int rangecount = code[2];
+ int charcount = code[3];
+
+ printf(" [%s", (*code == OP_CLASS)? "" : "^");
+ code += 3;
+
+ for (i = 0; i < 8; i++)
+ if ((flags & (1 << i)) != 0) printf("%s", class_names[i]);
+
+ for (i = 0; i < rangecount; i++)
+ {
+ if (isprint(*(++code))) printf("%c-", *code); else printf("\\x%02x-", *code);
+ if (isprint(*(++code))) printf("%c", *code); else printf("\\x%02x", *code);
+ }
+
+ for (i = 0; i < charcount; i++)
+ {
+ if (!isprint(*(++code))) printf("\\x%02x", *code);
+ else if (strchr("-\\]", *code) != NULL) printf("\\%c", *code);
+ else printf("%c", *code);
+ }
+ printf("]");
+
+ switch(*(++code))
+ {
+ case OP_CRSTAR:
+ case OP_CRMINSTAR:
+ case OP_CRPLUS:
+ case OP_CRMINPLUS:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ printf("%s", OP_names[*code]);
+ break;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ min = (code[1] << 8) + code[2];
+ max = (code[3] << 8) + code[4];
+ if (max == 0) printf("{%d,}", min);
+ else printf("{%d,%d}", min, max);
+ if (*code == OP_CRMINRANGE) printf("?");
+ code += 4;
+ break;
+
+ default:
+ code--;
+ }
+ }
+ break;
+
+ /* Anything else is just a one-node item */
+
+ default:
+ printf(" %s", OP_names[*code]);
+ break;
+ }
+
+ code++;
+ printf("\n");
+ }
+printf("------------------------------------------------------------------\n");
+
+/* This check is done here in the debugging case so that the code that
+was compiled can be seen. */
+
+if (code - re->code > length)
+ {
+ *errorptr = "internal error: code overflow";
+ (pcre_free)(re);
+ *erroroffset = ptr - (uschar *)pattern;
+ return NULL;
+ }
+#endif
+
+return (pcre *)re;
+}
+
+
+
+/*************************************************
+* Match a character type *
+*************************************************/
+
+/* Not used in all the places it might be as it's sometimes faster
+to put the code inline.
+
+Arguments:
+ type the character type
+ c the character
+ multiline the multiline flag
+
+Returns: TRUE if character is of the type
+*/
+
+static BOOL
+match_type(int type, int c, BOOL dotall)
+{
+
+#ifdef DEBUG
+if (isprint(c)) printf("matching subject %c against ", c);
+ else printf("matching subject \\x%02x against ", c);
+printf("%s\n", OP_names[type]);
+#endif
+
+switch(type)
+ {
+ case OP_ANY: return dotall || c != '\n';
+ case OP_NOT_DIGIT: return (pcre_ctypes[c] & ctype_digit) == 0;
+ case OP_DIGIT: return (pcre_ctypes[c] & ctype_digit) != 0;
+ case OP_NOT_WHITESPACE: return (pcre_ctypes[c] & ctype_space) == 0;
+ case OP_WHITESPACE: return (pcre_ctypes[c] & ctype_space) != 0;
+ case OP_NOT_WORDCHAR: return (pcre_ctypes[c] & ctype_word) == 0;
+ case OP_WORDCHAR: return (pcre_ctypes[c] & ctype_word) != 0;
+ }
+return FALSE;
+}
+
+
+/*************************************************
+* Match a character class *
+*************************************************/
+
+/* Return "result" if char is in the class and "!result" otherwise.
+
+Arguments:
+ data points to the class item
+ c the subject character
+ result value to return if in class
+ md matching "static" data
+
+Returns: result or !result
+*/
+
+static BOOL
+match_class(register uschar *data, register int c, BOOL result, match_data *md)
+{
+int flags = data[1];
+int i;
+uschar *base = data;
+uschar *end;
+
+#ifdef DEBUG
+ {
+ uschar *d = base + 3;
+
+ if (isprint(c))
+ printf("match %c against [%s", c, result? "" : "^");
+ else
+ printf("match \\x%02x against [%s", c, result? "" : "^");
+
+ for (i = 0; i < 8; i++)
+ if ((flags & (1 << i)) != 0) printf("%s", class_names[i]);
+
+ for (i = 0; i < data[2]; i++)
+ {
+ if (isprint(*(++d))) printf("%c-", *d); else printf("\\x%02x-", *d);
+ if (isprint(*(++d))) printf("%c", *d); else printf("\\x%02x", *d);
+ }
+
+ for (i = 0; i < data[3]; i++)
+ {
+ if (!isprint(*(++d))) printf("\\x%02x", *d);
+ else if (strchr("-\\]", *d) != NULL) printf("\\%c", *d);
+ else printf("%c", *d);
+ }
+ printf("]\n");
+ }
+#endif
+
+/* Test for any character types */
+
+for (i = 0; flags != 0; i++)
+ {
+ if ((flags & 1) != 0 && match_type(class_ops[i], c, md->dotall))
+ return result;
+ flags >>= 1;
+ }
+
+/* Advance pointer to the specific chars and do the caseless or caseful testing
+of the ranges and individual characters as necessary. */
+
+data += 4;
+end = data + base[2] * 2;
+
+/* Caseless character ranges are slightly tricky, because of cases like [W-c].
+What we do is to uppercase the subject char if it is beyond the end of the
+range, or lowercase it if it is before the start of the range and try again if
+a caseful comparison has failed. This works because upper case letters come
+before lower case in ASCII code. It would not work in EBCDIC, for example,
+where they are the other way round, but then ranges like [W-c] would be illegal
+in EBCDIC. */
+
+if (md->caseless)
+ {
+ while (data < end)
+ {
+ register int d;
+ if (c >= (int)*data && c <= (int)data[1]) return result;
+ d = (c < (int)*data)? pcre_lcc[c] : pcre_ucc[c];
+ if (d >= (int)*data && d <= (int)data[1]) return result;
+ data += 2;
+ }
+ end += base[3];
+ c = pcre_lcc[c];
+ while (data < end) if (c == pcre_lcc[*data++]) return result;
+ }
+
+/* Caseful is easy */
+
+else
+ {
+ while (data < end)
+ {
+ if (c >= (int)*data && c <= (int)data[1]) return result;
+ data += 2;
+ }
+ end += base[3];
+ while (data < end) if (c == *data++) return result;
+ }
+
+/* Character is not in the class */
+
+return !result;
+}
+
+
+
+/*************************************************
+* Match a back-reference *
+*************************************************/
+
+/* If a back reference hasn't been set, the match fails.
+
+Arguments:
+ number reference number
+ eptr points into the subject
+ length length to be matched
+ md points to match data block
+
+Returns: TRUE if matched
+*/
+
+static BOOL
+match_ref(int number, register uschar *eptr, int length, match_data *md)
+{
+uschar *p = md->start_subject + md->offset_vector[number];
+
+#ifdef DEBUG
+if (eptr >= md->end_subject)
+ printf("matching subject <null>");
+else
+ {
+ printf("matching subject ");
+ pchars(eptr, length, TRUE, md);
+ }
+printf(" against backref ");
+pchars(p, length, FALSE, md);
+printf("\n");
+#endif
+
+/* Always fail if not enough characters left */
+
+if (length > md->end_subject - p) return FALSE;
+
+/* Separate the caselesss case for speed */
+
+if (md->caseless)
+ { while (length-- > 0) if (pcre_lcc[*p++] != pcre_lcc[*eptr++]) return FALSE; }
+else
+ { while (length-- > 0) if (*p++ != *eptr++) return FALSE; }
+
+return TRUE;
+}
+
+static int free_stack(match_data *md)
+{
+/* Free any stack space that was allocated by the call to match(). */
+if (md->off_num) free(md->off_num);
+if (md->offset_top) free(md->offset_top);
+if (md->r1) free(md->r1);
+if (md->r2) free(md->r2);
+if (md->eptr) free(md->eptr);
+if (md->ecode) free(md->ecode);
+}
+
+static int grow_stack(match_data *md)
+{
+ md->length = md->length ? md->length+md->length/2 : 200;
+ md->offset_top=realloc(md->offset_top, md->length*sizeof(int));
+ md->eptr=realloc(md->eptr, md->length*sizeof(void *));
+ md->ecode=realloc(md->ecode, md->length*sizeof(void *));
+ md->off_num=realloc(md->off_num, md->length*sizeof(int));
+ md->r1=realloc(md->r1, md->length*sizeof(int));
+ md->r2=realloc(md->r2, md->length*sizeof(int));
+ return 0;
+}
+
+/*************************************************
+* Match from current position *
+*************************************************/
+
+/* On entry ecode points to the first opcode, and eptr to the first character.
+
+Arguments:
+ eptr pointer in subject
+ ecode position in code
+ offset_top current top pointer
+ md pointer to "static" info for the match
+
+Returns: TRUE if matched
+*/
+
+static BOOL
+match(register uschar *eptr, register uschar *ecode, int offset_top,
+ match_data *md)
+{
+ int save_stack_position = md->point;
+match_loop:
+
+#define SUCCEED goto succeed
+#define FAIL goto fail
+
+for (;;)
+ {
+ int min, max, ctype;
+ register int i;
+ register int c;
+ BOOL minimize;
+
+ /* Opening bracket. Check the alternative branches in turn, failing if none
+ match. We have to set the start offset if required and there is space
+ in the offset vector so that it is available for subsequent back references
+ if the bracket matches. However, if the bracket fails, we must put back the
+ previous value of both offsets in case they were set by a previous copy of
+ the same bracket. Don't worry about setting the flag for the error case here;
+ that is handled in the code for KET. */
+
+ if ((int)*ecode >= OP_BRA)
+ {
+ int number = (*ecode - OP_BRA) << 1;
+ int save_offset1, save_offset2;
+
+ #ifdef DEBUG
+ printf("start bracket %d\n", number/2);
+ #endif
+
+ if (number > 0 && number < md->offset_end)
+ {
+ save_offset1 = md->offset_vector[number];
+ save_offset2 = md->offset_vector[number+1];
+ md->offset_vector[number] = eptr - md->start_subject;
+
+ #ifdef DEBUG
+ printf("saving %d %d\n", save_offset1, save_offset2);
+ #endif
+ }
+
+ /* Recurse for all the alternatives. */
+
+ do
+ {
+ if (match(eptr, ecode+3, offset_top, md)) SUCCEED;
+ ecode += (ecode[1] << 8) + ecode[2];
+ }
+ while (*ecode == OP_ALT);
+
+ #ifdef DEBUG
+ printf("bracket %d failed\n", number/2);
+ #endif
+
+ if (number > 0 && number < md->offset_end)
+ {
+ md->offset_vector[number] = save_offset1;
+ md->offset_vector[number+1] = save_offset2;
+ }
+
+ FAIL;
+ }
+
+ /* Other types of node can be handled by a switch */
+
+ switch(*ecode)
+ {
+ case OP_END:
+ md->end_match_ptr = eptr; /* Record where we ended */
+ md->end_offset_top = offset_top; /* and how many extracts were taken */
+ SUCCEED;
+
+ /* Assertion brackets. Check the alternative branches in turn - the
+ matching won't pass the KET for an assertion. If any one branch matches,
+ the assertion is true. */
+
+ case OP_ASSERT:
+ do
+ {
+ if (match(eptr, ecode+3, offset_top, md)) break;
+ ecode += (ecode[1] << 8) + ecode[2];
+ }
+ while (*ecode == OP_ALT);
+ if (*ecode == OP_KET) FAIL;
+
+ /* Continue from after the assertion, updating the offsets high water
+ mark, since extracts may have been taken during the assertion. */
+
+ do ecode += (ecode[1] << 8) + ecode[2]; while (*ecode == OP_ALT);
+ ecode += 3;
+ offset_top = md->end_offset_top;
+ continue;
+
+ /* Negative assertion: all branches must fail to match */
+
+ case OP_ASSERT_NOT:
+ do
+ {
+ if (match(eptr, ecode+3, offset_top, md)) FAIL;
+ ecode += (ecode[1] << 8) + ecode[2];
+ }
+ while (*ecode == OP_ALT);
+ ecode += 3;
+ continue;
+
+ /* An alternation is the end of a branch; scan along to find the end of the
+ bracketed group and go to there. */
+
+ case OP_ALT:
+ do ecode += (ecode[1] << 8) + ecode[2]; while (*ecode == OP_ALT);
+ break;
+
+ /* BRAZERO and BRAMINZERO occur just before a bracket group, indicating
+ that it may occur zero times. It may repeat infinitely, or not at all -
+ i.e. it could be ()* or ()? in the pattern. Brackets with fixed upper
+ repeat limits are compiled as a number of copies, with the optional ones
+ preceded by BRAZERO or BRAMINZERO. */
+
+ case OP_BRAZERO:
+ {
+ uschar *next = ecode+1;
+ if (match(eptr, next, offset_top, md)) SUCCEED;
+ do next += (next[1] << 8) + next[2]; while (*next == OP_ALT);
+ ecode = next + 3;
+ }
+ break;
+
+ case OP_BRAMINZERO:
+ {
+ uschar *next = ecode+1;
+ do next += (next[1] << 8) + next[2]; while (*next == OP_ALT);
+ if (match(eptr, next+3, offset_top, md)) SUCCEED;
+ ecode++;
+ }
+ break;;
+
+ /* End of a group, repeated or non-repeating. If we are at the end of
+ an assertion "group", stop matching and SUCCEED, but record the
+ current high water mark for use by positive assertions. */
+
+ case OP_KET:
+ case OP_KETRMIN:
+ case OP_KETRMAX:
+ {
+ int number, start, end;
+ uschar *prev = ecode - (ecode[1] << 8) - ecode[2];
+
+ if (*prev == OP_ASSERT || *prev == OP_ASSERT_NOT)
+ {
+ md->end_offset_top = offset_top;
+ SUCCEED;
+ }
+
+ /* In all other cases we have to check the group number back at the
+ start and if necessary complete handling an extraction by setting the
+ final offset and bumping the high water mark. */
+
+ number = (*prev - OP_BRA) << 1;
+
+ #ifdef DEBUG
+ printf("end bracket %d\n", number/2);
+ #endif
+
+ if (number > 0)
+ {
+ if (number >= md->offset_end) md->offset_overflow = TRUE; else
+ {
+ start=md->offset_vector[number] ; end =md->offset_vector[number+1];
+ md->offset_vector[number+1] = eptr - md->start_subject;
+ if (offset_top <= number) offset_top = number + 2;
+ }
+ }
+
+ /* For a non-repeating ket, just advance to the next node and continue at
+ this level. */
+
+ if (*ecode == OP_KET)
+ {
+ ecode += 3;
+ break;
+ }
+
+ /* The repeating kets try the rest of the pattern or restart from the
+ preceding bracket, in the appropriate order. */
+
+ if (*ecode == OP_KETRMIN)
+ {
+ uschar *ptr;
+ if (match(eptr, ecode+3, offset_top, md)) goto succeed;
+ /* Handle alternation inside the BRA...KET; push the additional
+ alternatives onto the stack
+ XXX this tries the alternatives backwards! */
+ ptr=prev;
+ do {
+ ptr += (ptr[1]<<8)+ ptr[2];
+ if (*ptr==OP_ALT)
+ {
+ if (md->length == md->point) grow_stack(md);
+ md->offset_top[md->point] = offset_top;
+ md->eptr[md->point] = eptr;
+ md->ecode[md->point] = ptr+3;
+ md->r1[md->point] = 0;
+ md->r2[md->point] = 0;
+ md->off_num[md->point] = 0;
+ md->point++;
+ }
+ } while (*ptr==OP_ALT);
+ ecode=prev+3; goto match_loop;
+ }
+ else /* OP_KETRMAX */
+ {
+ uschar *ptr;
+ int points_pushed=0;
+
+ /* Push one failure point, that will resume matching at the code after
+ the KETRMAX opcode. */
+ if (md->length == md->point) grow_stack(md);
+ md->offset_top[md->point] = offset_top;
+ md->eptr[md->point] = eptr;
+ md->ecode[md->point] = ecode+3;
+ md->r1[md->point] = md->offset_vector[number];
+ md->r2[md->point] = md->offset_vector[number+1];
+ md->off_num[md->point] = number;
+ md->point++;
+
+ md->offset_vector[number] = eptr - md->start_subject;
+ /* Handle alternation inside the BRA...KET; push each of the
+ additional alternatives onto the stack
+ XXX this tries the alternatives backwards! */
+ ptr=prev;
+ do {
+ ptr += (ptr[1]<<8)+ ptr[2];
+ if (*ptr==OP_ALT)
+ {
+ if (md->length == md->point) grow_stack(md);
+ md->offset_top[md->point] = offset_top;
+ md->eptr[md->point] = eptr;
+ md->ecode[md->point] = ptr+3;
+ md->r1[md->point] = 0;
+ md->r2[md->point] = 0;
+ md->off_num[md->point] = 0;
+ md->point++;
+ points_pushed++;
+ }
+ } while (*ptr==OP_ALT);
+ /* Jump to the first (or only) alternative and resume trying to match */
+ ecode=prev+3; goto match_loop;
+ }
+ }
+ FAIL;
+
+ /* Start of subject, or after internal newline if multiline */
+
+ case OP_CIRC:
+ if (md->multiline)
+ {
+ if (eptr != md->start_subject && eptr[-1] != '\n') FAIL;
+ ecode++;
+ break;
+ }
+ /* ... else fall through */
+
+ /* Start of subject assertion */
+
+ case OP_SOD:
+ if (eptr != md->start_subject) FAIL;
+ ecode++;
+ break;
+
+ /* End of subject, or before internal newline if multiline */
+
+ case OP_DOLL:
+ if (md->multiline)
+ {
+ if (eptr < md->end_subject && *eptr != '\n') FAIL;
+ ecode++;
+ break;
+ }
+ /* ... else fall through */
+
+ /* End of subject assertion */
+
+ case OP_EOD:
+ if (eptr < md->end_subject) FAIL;
+ ecode++;
+ break;
+
+ /* Word boundary assertions */
+
+ case OP_NOT_WORD_BOUNDARY:
+ case OP_WORD_BOUNDARY:
+ {
+ BOOL prev_is_word = (eptr != md->start_subject) &&
+ ((pcre_ctypes[eptr[-1]] & ctype_word) != 0);
+ BOOL cur_is_word = (eptr < md->end_subject) &&
+ ((pcre_ctypes[*eptr] & ctype_word) != 0);
+ if ((*ecode++ == OP_WORD_BOUNDARY)?
+ cur_is_word == prev_is_word : cur_is_word != prev_is_word)
+ FAIL;
+ }
+ break;
+
+ /* Match a single character type; inline for speed */
+
+ case OP_ANY:
+ if (!md->dotall && eptr < md->end_subject && *eptr == '\n') FAIL;
+ if (eptr++ >= md->end_subject) FAIL;
+ ecode++;
+ break;
+
+ case OP_NOT_DIGIT:
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_digit) != 0)
+ FAIL;
+ ecode++;
+ break;
+
+ case OP_DIGIT:
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_digit) == 0)
+ FAIL;
+ ecode++;
+ break;
+
+ case OP_NOT_WHITESPACE:
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_space) != 0)
+ FAIL;
+ ecode++;
+ break;
+
+ case OP_WHITESPACE:
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_space) == 0)
+ FAIL;
+ ecode++;
+ break;
+
+ case OP_NOT_WORDCHAR:
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_word) != 0)
+ FAIL;
+ ecode++;
+ break;
+
+ case OP_WORDCHAR:
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr++] & ctype_word) == 0)
+ FAIL;
+ ecode++;
+ break;
+
+ /* Match a back reference, possibly repeatedly. Look past the end of the
+ item to see if there is repeat information following. The code is similar
+ to that for character classes, but repeated for efficiency. Then obey
+ similar code to character type repeats - written out again for speed.
+ However, if the referenced string is the empty string, always treat
+ it as matched, any number of times (otherwise there could be infinite
+ loops). */
+
+ case OP_REF:
+ {
+ int length;
+ int number = ecode[1] << 1; /* Doubled reference number */
+ ecode += 2; /* Advance past the item */
+
+ if (number >= offset_top || md->offset_vector[number] < 0)
+ {
+ md->errorcode = PCRE_ERROR_BADREF;
+ FAIL;
+ }
+
+ length = md->offset_vector[number+1] - md->offset_vector[number];
+
+ switch (*ecode)
+ {
+ case OP_CRSTAR:
+ case OP_CRMINSTAR:
+ case OP_CRPLUS:
+ case OP_CRMINPLUS:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ c = *ecode++ - OP_CRSTAR;
+ minimize = (c & 1) != 0;
+ min = rep_min[c]; /* Pick up values from tables; */
+ max = rep_max[c]; /* zero for max => infinity */
+ if (max == 0) max = INT_MAX;
+ break;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ minimize = (*ecode == OP_CRMINRANGE);
+ min = (ecode[1] << 8) + ecode[2];
+ max = (ecode[3] << 8) + ecode[4];
+ if (max == 0) max = INT_MAX;
+ ecode += 5;
+ break;
+
+ default: /* No repeat follows */
+ if (!match_ref(number, eptr, length, md)) FAIL;
+ eptr += length;
+ continue; /* With the main loop */
+ }
+
+ /* If the length of the reference is zero, just continue with the
+ main loop. */
+
+ if (length == 0) continue;
+
+ /* First, ensure the minimum number of matches are present. We get back
+ the length of the reference string explicitly rather than passing the
+ address of eptr, so that eptr can be a register variable. */
+
+ for (i = 1; i <= min; i++)
+ {
+ if (!match_ref(number, eptr, length, md)) FAIL;
+ eptr += length;
+ }
+
+ /* If min = max, continue at the same level without recursion.
+ They are not both allowed to be zero. */
+
+ if (min == max) continue;
+
+ /* If minimizing, keep trying and advancing the pointer */
+
+ if (minimize)
+ {
+ for (i = min;; i++)
+ {
+ if (match(eptr, ecode, offset_top, md)) SUCCEED;
+ if (i >= max || !match_ref(number, eptr, length, md))
+ FAIL;
+ eptr += length;
+ }
+ /* Control never gets here */
+ }
+
+ /* If maximizing, find the longest string and work backwards */
+
+ else
+ {
+ uschar *pp = eptr;
+ for (i = min; i < max; i++)
+ {
+ if (!match_ref(number, eptr, length, md)) break;
+ eptr += length;
+ }
+ while (eptr >= pp)
+ {
+ if (match(eptr, ecode, offset_top, md)) SUCCEED;
+ eptr -= length;
+ }
+ FAIL;
+ }
+ }
+ /* Control never gets here */
+
+ /* Match a character class, possibly repeatedly. Look past the end of the
+ item to see if there is repeat information following. Then obey similar
+ code to character type repeats - written out again for speed. */
+
+ case OP_CLASS:
+ case OP_NEGCLASS:
+ {
+ BOOL result = *ecode == OP_CLASS;
+ uschar *data = ecode; /* Save for matching */
+
+ ecode += 4 + 2 * ecode[2] + ecode[3]; /* Advance past the item */
+
+ switch (*ecode)
+ {
+ case OP_CRSTAR:
+ case OP_CRMINSTAR:
+ case OP_CRPLUS:
+ case OP_CRMINPLUS:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ c = *ecode++ - OP_CRSTAR;
+ minimize = (c & 1) != 0;
+ min = rep_min[c]; /* Pick up values from tables; */
+ max = rep_max[c]; /* zero for max => infinity */
+ if (max == 0) max = INT_MAX;
+ break;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ minimize = (*ecode == OP_CRMINRANGE);
+ min = (ecode[1] << 8) + ecode[2];
+ max = (ecode[3] << 8) + ecode[4];
+ if (max == 0) max = INT_MAX;
+ ecode += 5;
+ break;
+
+ default: /* No repeat follows */
+ if (eptr >= md->end_subject || !match_class(data, *eptr++, result, md))
+ FAIL;
+ continue; /* With the main loop */
+ }
+
+ /* First, ensure the minimum number of matches are present. */
+
+ for (i = 1; i <= min; i++)
+ if (eptr >= md->end_subject || !match_class(data, *eptr++, result, md))
+ FAIL;
+
+ /* If max == min we can continue with the main loop without the
+ need to recurse. */
+
+ if (min == max) continue;
+
+ /* If minimizing, keep testing the rest of the expression and advancing
+ the pointer while it matches the class. */
+
+ if (minimize)
+ {
+ for (i = min;; i++)
+ {
+ if (match(eptr, ecode, offset_top, md)) SUCCEED;
+ if (i >= max || eptr >= md->end_subject ||
+ !match_class(data, *eptr++, result, md)) FAIL;
+ }
+ /* Control never gets here */
+ }
+
+ /* If maximizing, find the longest possible run, then work backwards. */
+
+ else
+ {
+ uschar *pp = eptr;
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || !match_class(data, *eptr, result, md))
+ break;
+ eptr++;
+ }
+ while (eptr >= pp)
+ if (match(eptr--, ecode, offset_top, md)) SUCCEED;
+ FAIL;
+ }
+ }
+ /* Control never gets here */
+
+ /* Match a run of characters */
+
+ case OP_CHARS:
+ {
+ register int length = ecode[1];
+ ecode += 2;
+
+ #ifdef DEBUG
+ if (eptr >= md->end_subject)
+ printf("matching subject <null> against pattern ");
+ else
+ {
+ printf("matching subject ");
+ pchars(eptr, length, TRUE, md);
+ printf(" against pattern ");
+ }
+ pchars(ecode, length, FALSE, md);
+ printf("\n");
+ #endif
+
+ if (length > md->end_subject - eptr) FAIL;
+ if (md->caseless)
+ {
+ while (length-- > 0) if (pcre_lcc[*ecode++] != pcre_lcc[*eptr++]) FAIL;
+ }
+ else
+ {
+ while (length-- > 0) if (*ecode++ != *eptr++) FAIL;
+ }
+ }
+ break;
+
+ /* Match a single character repeatedly; different opcodes share code. */
+
+ case OP_EXACT:
+ min = max = (ecode[1] << 8) + ecode[2];
+ ecode += 3;
+ goto REPEATCHAR;
+
+ case OP_UPTO:
+ case OP_MINUPTO:
+ min = 0;
+ max = (ecode[1] << 8) + ecode[2];
+ minimize = *ecode == OP_MINUPTO;
+ ecode += 3;
+ goto REPEATCHAR;
+
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ c = *ecode++ - OP_STAR;
+ minimize = (c & 1) != 0;
+ min = rep_min[c]; /* Pick up values from tables; */
+ max = rep_max[c]; /* zero for max => infinity */
+ if (max == 0) max = INT_MAX;
+
+ /* Common code for all repeated single-character matches. We can give
+ up quickly if there are fewer than the minimum number of characters left in
+ the subject. */
+
+ REPEATCHAR:
+ if (min > md->end_subject - eptr) FAIL;
+ c = *ecode++;
+
+ /* The code is duplicated for the caseless and caseful cases, for speed,
+ since matching characters is likely to be quite common. First, ensure the
+ minimum number of matches are present. If min = max, continue at the same
+ level without recursing. Otherwise, if minimizing, keep trying the rest of
+ the expression and advancing one matching character if failing, up to the
+ maximum. Alternatively, if maximizing, find the maximum number of
+ characters and work backwards. */
+
+ #ifdef DEBUG
+ printf("matching %c{%d,%d} against subject %.*s\n", c, min, max,
+ max, eptr);
+ #endif
+
+ if (md->caseless)
+ {
+ c = pcre_lcc[c];
+ for (i = 1; i <= min; i++) if (c != pcre_lcc[*eptr++]) FAIL;
+ if (min == max) continue;
+ if (minimize)
+ {
+ for (i = min;; i++)
+ {
+ if (match(eptr, ecode, offset_top, md)) SUCCEED;
+ if (i >= max || eptr >= md->end_subject || c != pcre_lcc[*eptr++])
+ FAIL;
+ }
+ /* Control never gets here */
+ }
+ else
+ {
+ uschar *pp = eptr;
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || c != pcre_lcc[*eptr]) break;
+ eptr++;
+ }
+ while (eptr >= pp)
+ if (match(eptr--, ecode, offset_top, md)) SUCCEED;
+ FAIL;
+ }
+ }
+
+ /* Caseful comparisons */
+
+ else
+ {
+ for (i = 1; i <= min; i++) if (c != *eptr++) FAIL;
+ if (min == max) continue;
+ if (minimize)
+ {
+ for (i = min;; i++)
+ {
+ if (match(eptr, ecode, offset_top, md)) SUCCEED;
+ if (i >= max || eptr >= md->end_subject || c != *eptr++) FAIL;
+ }
+ /* Control never gets here */
+ }
+ else
+ {
+ uschar *pp = eptr;
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || c != *eptr) break;
+ eptr++;
+ }
+ while (eptr >= pp)
+ if (match(eptr--, ecode, offset_top, md)) SUCCEED;
+ FAIL;
+ }
+ }
+ /* Control never gets here */
+
+ /* Match a single character type repeatedly; several different opcodes
+ share code. This is very similar to the code for single characters, but we
+ repeat it in the interests of efficiency. */
+
+ case OP_TYPEEXACT:
+ min = max = (ecode[1] << 8) + ecode[2];
+ minimize = TRUE;
+ ecode += 3;
+ goto REPEATTYPE;
+
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ min = 0;
+ max = (ecode[1] << 8) + ecode[2];
+ minimize = *ecode == OP_TYPEMINUPTO;
+ ecode += 3;
+ goto REPEATTYPE;
+
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEPLUS:
+ case OP_TYPEMINPLUS:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ c = *ecode++ - OP_TYPESTAR;
+ minimize = (c & 1) != 0;
+ min = rep_min[c]; /* Pick up values from tables; */
+ max = rep_max[c]; /* zero for max => infinity */
+ if (max == 0) max = INT_MAX;
+
+ /* Common code for all repeated single character type matches */
+
+ REPEATTYPE:
+ ctype = *ecode++; /* Code for the character type */
+
+ /* First, ensure the minimum number of matches are present. Use inline
+ code for maximizing the speed, and do the type test once at the start
+ (i.e. keep it out of the loop). Also test that there are at least the
+ minimum number of characters before we start. */
+
+ if (min > md->end_subject - eptr) FAIL;
+ if (min > 0) switch(ctype)
+ {
+ case OP_ANY:
+ if (!md->dotall)
+ { for (i = 1; i <= min; i++) if (*eptr++ == '\n') FAIL; }
+ else eptr += min;
+ break;
+
+ case OP_NOT_DIGIT:
+ for (i = 1; i <= min; i++)
+ if ((pcre_ctypes[*eptr++] & ctype_digit) != 0) FAIL;
+ break;
+
+ case OP_DIGIT:
+ for (i = 1; i <= min; i++)
+ if ((pcre_ctypes[*eptr++] & ctype_digit) == 0) FAIL;
+ break;
+
+ case OP_NOT_WHITESPACE:
+ for (i = 1; i <= min; i++)
+ if ((pcre_ctypes[*eptr++] & ctype_space) != 0) FAIL;
+ break;
+
+ case OP_WHITESPACE:
+ for (i = 1; i <= min; i++)
+ if ((pcre_ctypes[*eptr++] & ctype_space) == 0) FAIL;
+ break;
+
+ case OP_NOT_WORDCHAR:
+ for (i = 1; i <= min; i++) if ((pcre_ctypes[*eptr++] & ctype_word) != 0)
+ FAIL;
+ break;
+
+ case OP_WORDCHAR:
+ for (i = 1; i <= min; i++) if ((pcre_ctypes[*eptr++] & ctype_word) == 0)
+ FAIL;
+ break;
+ }
+
+ /* If min = max, continue at the same level without recursing */
+
+ if (min == max) continue;
+
+ /* If minimizing, we have to test the rest of the pattern before each
+ subsequent match, so inlining isn't much help; just use the function. */
+
+ if (minimize)
+ {
+ for (i = min;; i++)
+ {
+ if (match(eptr, ecode, offset_top, md)) SUCCEED;
+ if (i >= max || eptr >= md->end_subject ||
+ !match_type(ctype, *eptr++, md->dotall))
+ FAIL;
+ }
+ /* Control never gets here */
+ }
+
+ /* If maximizing it is worth using inline code for speed, doing the type
+ test once at the start (i.e. keep it out of the loop). */
+
+ else
+ {
+ uschar *pp = eptr;
+ switch(ctype)
+ {
+ case OP_ANY:
+ if (!md->dotall)
+ {
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || *eptr == '\n') break;
+ eptr++;
+ }
+ }
+ else
+ {
+ c = max - min;
+ if (c > md->end_subject - eptr) c = md->end_subject - eptr;
+ eptr += c;
+ }
+ break;
+
+ case OP_NOT_DIGIT:
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_digit) != 0)
+ break;
+ eptr++;
+ }
+ break;
+
+ case OP_DIGIT:
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_digit) == 0)
+ break;
+ eptr++;
+ }
+ break;
+
+ case OP_NOT_WHITESPACE:
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_space) != 0)
+ break;
+ eptr++;
+ }
+ break;
+
+ case OP_WHITESPACE:
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_space) == 0)
+ break;
+ eptr++;
+ }
+ break;
+
+ case OP_NOT_WORDCHAR:
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_word) != 0)
+ break;
+ eptr++;
+ }
+ break;
+
+ case OP_WORDCHAR:
+ for (i = min; i < max; i++)
+ {
+ if (eptr >= md->end_subject || (pcre_ctypes[*eptr] & ctype_word) == 0)
+ break;
+ eptr++;
+ }
+ break;
+ }
+
+ while (eptr >= pp)
+ if (match(eptr--, ecode, offset_top, md)) SUCCEED;
+ FAIL;
+ }
+ /* Control never gets here */
+
+ /* There's been some horrible disaster. */
+
+ default:
+ #ifdef DEBUG
+ printf("Unknown opcode %d\n", *ecode);
+ #endif
+ md->errorcode = PCRE_ERROR_UNKNOWN_NODE;
+ FAIL;
+ }
+
+ /* Do not stick any code in here without much thought; it is assumed
+ that "continue" in the code above comes out to here to repeat the main
+ loop. */
+
+ } /* End of main loop */
+/* Control never reaches here */
+
+fail:
+ if (md->point > save_stack_position)
+ {
+ /* If there are still points remaining on the stack, pop the next one off */
+ int start, end, off_num;
+
+ md->point--;
+ offset_top = md->offset_top[md->point];
+ eptr = md->eptr[md->point];
+ ecode = md->ecode[md->point];
+ off_num = md->off_num[md->point];
+ md->offset_vector[off_num] = md->r1[md->point];
+ md->offset_vector[off_num+1] = md->r2[md->point];
+ goto match_loop;
+ }
+ /* Failure, and nothing left on the stack, so end this function call */
+
+ /* Restore the top of the stack to where it was before this function
+ call. This lets us use one stack for everything; recursive calls
+ can push and pop information, and may increase the stack. When
+ the call returns, the parent function can resume pushing and
+ popping wherever it was. */
+
+ md->point = save_stack_position;
+ return FALSE;
+
+succeed:
+ return TRUE;
+}
+
+
+/*************************************************
+* Execute a Regular Expression *
+*************************************************/
+
+/* This function applies a compiled re to a subject string and picks out
+portions of the string if it matches. Two elements in the vector are set for
+each substring: the offsets to the start and end of the substring.
+
+Arguments:
+ re points to the compiled expression
+ extra points to "hints" from pcre_study() or is NULL
+ subject points to the subject string
+ length length of subject string (may contain binary zeros)
+ options option bits
+ offsets points to a vector of ints to be filled in with offsets
+ offsetcount the number of elements in the vector
+
+Returns: > 0 => success; value is the number of elements filled in
+ = 0 => success, but offsets is not big enough
+ -1 => failed to match
+ < -1 => some kind of unexpected problem
+*/
+
+int
+pcre_exec(pcre *external_re, pcre_extra *external_extra, char *subject,
+ int length, int options, int *offsets, int offsetcount)
+{
+int resetcount;
+int first_char = -1;
+match_data match_block;
+uschar *start_bits = NULL;
+uschar *start_match = (uschar *)subject;
+uschar *end_subject;
+real_pcre *re = (real_pcre *)external_re;
+real_pcre_extra *extra = (real_pcre_extra *)external_extra;
+BOOL anchored = ((re->options | options) & PCRE_ANCHORED) != 0;
+BOOL startline = (re->options & PCRE_STARTLINE) != 0;
+
+if ((options & ~PUBLIC_EXEC_OPTIONS) != 0) return PCRE_ERROR_BADOPTION;
+
+if (re == NULL || subject == NULL ||
+ (offsets == NULL && offsetcount > 0)) return PCRE_ERROR_NULL;
+if (re->magic_number != MAGIC_NUMBER) return PCRE_ERROR_BADMAGIC;
+
+match_block.start_subject = (uschar *)subject;
+match_block.end_subject = match_block.start_subject + length;
+end_subject = match_block.end_subject;
+
+match_block.caseless = ((re->options | options) & PCRE_CASELESS) != 0;
+match_block.multiline = ((re->options |options) & PCRE_MULTILINE) != 0;
+match_block.dotall = ((re->options |options) & PCRE_DOTALL) != 0;
+
+match_block.offset_vector = offsets; /* Where offsets go */
+match_block.offset_end = (offsetcount & (-2)); /* Past max permitted (even) */
+match_block.offset_overflow = FALSE;
+
+match_block.errorcode = PCRE_ERROR_NOMATCH; /* Default error */
+
+/* Set the stack state to empty */
+ match_block.off_num = match_block.offset_top = NULL;
+ match_block.r1 = match_block.r2 = NULL;
+ match_block.eptr = match_block.ecode = NULL;
+ match_block.point = match_block.length = 0;
+
+/* Compute the minimum number of offsets that we need to reset each time. Doing
+this makes a huge difference to execution time when there aren't many brackets
+in the pattern. */
+
+resetcount = 2 + re->top_bracket * 2;
+if (resetcount > offsetcount) resetcount = offsetcount;
+
+/* If MULTILINE is set at exec time but was not set at compile time, and the
+anchored flag is set, we must re-check because a setting provoked by ^ in the
+pattern is not right in multi-line mode. Calling is_anchored() again here does
+the right check, because multiline is now set. If it now yields FALSE, the
+expression must have had ^ starting some of its branches. Check to see if
+that is true for *all* branches, and if so, set the startline flag. */
+
+if (match_block. multiline && anchored && (re->options & PCRE_MULTILINE) == 0 &&
+ !is_anchored(re->code, match_block.multiline))
+ {
+ anchored = FALSE;
+ if (is_startline(re->code)) startline = TRUE;
+ }
+
+/* Set up the first character to match, if available. The first_char value is
+never set for an anchored regular expression, but the anchoring may be forced
+at run time, so we have to test for anchoring. The first char may be unset for
+an unanchored pattern, of course. If there's no first char and the pattern was
+studied, the may be a bitmap of possible first characters. However, we can
+use this only if the caseless state of the studying was correct. */
+
+if (!anchored)
+ {
+ if ((re->options & PCRE_FIRSTSET) != 0)
+ {
+ first_char = re->first_char;
+ if (match_block.caseless) first_char = pcre_lcc[first_char];
+ }
+ else
+ if (!startline && extra != NULL &&
+ (extra->options & PCRE_STUDY_MAPPED) != 0 &&
+ ((extra->options & PCRE_STUDY_CASELESS) != 0) == match_block.caseless)
+ start_bits = extra->start_bits;
+ }
+
+/* Loop for unanchored matches; for anchored regexps the loop runs just once. */
+
+do
+ {
+ register int *iptr = offsets;
+ register int *iend = offsets + resetcount;
+
+ /* Reset the maximum number of extractions we might see. */
+
+ while (iptr < iend) *iptr++ = -1;
+
+ /* Advance to a unique first char if possible */
+
+ if (first_char >= 0)
+ {
+ if (match_block.caseless)
+ while (start_match < end_subject && pcre_lcc[*start_match] != first_char)
+ start_match++;
+ else
+ while (start_match < end_subject && *start_match != first_char)
+ start_match++;
+ }
+
+ /* Or to just after \n for a multiline match if possible */
+
+ else if (startline)
+ {
+ if (start_match > match_block.start_subject)
+ {
+ while (start_match < end_subject && start_match[-1] != '\n')
+ start_match++;
+ }
+ }
+
+ /* Or to a non-unique first char */
+
+ else if (start_bits != NULL)
+ {
+ while (start_match < end_subject)
+ {
+ register int c = *start_match;
+ if ((start_bits[c/8] & (1<<(c%8))) == 0) start_match++; else break;
+ }
+ }
+
+ #ifdef DEBUG
+ printf(">>>> Match against: ");
+ pchars(start_match, end_subject - start_match, TRUE, &match_block);
+ printf("\n");
+ #endif
+
+ /* When a match occurs, substrings will be set for all internal extractions;
+ we just need to set up the whole thing as substring 0 before returning. If
+ there were too many extractions, set the return code to zero. */
+
+ if (match(start_match, re->code, 2, &match_block))
+ {
+ int rc = match_block.offset_overflow? 0 : match_block.end_offset_top/2;
+ if (match_block.offset_end < 2) rc = 0; else
+ {
+ offsets[0] = start_match - match_block.start_subject;
+ offsets[1] = match_block.end_match_ptr - match_block.start_subject;
+ }
+ #ifdef DEBUG
+ printf(">>>> returning %d\n", rc);
+ #endif
+ free_stack(&match_block);
+ return rc;
+ }
+ }
+while (!anchored &&
+ match_block.errorcode == PCRE_ERROR_NOMATCH &&
+ start_match++ < end_subject);
+
+#ifdef DEBUG
+printf(">>>> returning %d\n", match_block.errorcode);
+#endif
+free_stack(&match_block);
+return match_block.errorcode;
+}
+
+/* End of pcre.c */