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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /erts/emulator/pcre/pcre_compile.c
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The R13B03 release.OTP_R13B03
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+/*************************************************
+* Perl-Compatible Regular Expressions *
+*************************************************/
+
+/* PCRE 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
+ Copyright (c) 1997-2008 University of Cambridge
+
+-----------------------------------------------------------------------------
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+ * Neither the name of the University of Cambridge nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+-----------------------------------------------------------------------------
+*/
+
+
+/* This module contains the external function erts_pcre_compile(), along with
+supporting internal functions that are not used by other modules. */
+
+/* %ExternalCopyright% */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define NLBLOCK cd /* Block containing newline information */
+#define PSSTART start_pattern /* Field containing processed string start */
+#define PSEND end_pattern /* Field containing processed string end */
+
+#include "pcre_internal.h"
+
+
+/* When DEBUG is defined, we need the pcre_printint() function, which is also
+used by pcretest. DEBUG is not defined when building a production library. */
+
+#ifdef DEBUG
+#include "pcre_printint.src"
+#endif
+
+
+/* Macro for setting individual bits in class bitmaps. */
+
+#define SETBIT(a,b) a[b/8] |= (1 << (b%8))
+
+/* Maximum length value to check against when making sure that the integer that
+holds the compiled pattern length does not overflow. We make it a bit less than
+INT_MAX to allow for adding in group terminating bytes, so that we don't have
+to check them every time. */
+
+#define OFLOW_MAX (INT_MAX - 20)
+
+
+/*************************************************
+* Code parameters and static tables *
+*************************************************/
+
+/* This value specifies the size of stack workspace that is used during the
+first pre-compile phase that determines how much memory is required. The regex
+is partly compiled into this space, but the compiled parts are discarded as
+soon as they can be, so that hopefully there will never be an overrun. The code
+does, however, check for an overrun. The largest amount I've seen used is 218,
+so this number is very generous.
+
+The same workspace is used during the second, actual compile phase for
+remembering forward references to groups so that they can be filled in at the
+end. Each entry in this list occupies LINK_SIZE bytes, so even when LINK_SIZE
+is 4 there is plenty of room. */
+
+#define COMPILE_WORK_SIZE (4096)
+
+
+/* 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. */
+
+#ifndef EBCDIC /* This is the "normal" table for ASCII systems */
+static const short int escapes[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 0 - 7 */
+ 0, 0, ':', ';', '<', '=', '>', '?', /* 8 - ? */
+ '@', -ESC_A, -ESC_B, -ESC_C, -ESC_D, -ESC_E, 0, -ESC_G, /* @ - G */
+-ESC_H, 0, 0, -ESC_K, 0, 0, 0, 0, /* H - O */
+-ESC_P, -ESC_Q, -ESC_R, -ESC_S, 0, 0, -ESC_V, -ESC_W, /* P - W */
+-ESC_X, 0, -ESC_Z, '[', '\\', ']', '^', '_', /* X - _ */
+ '`', 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0, /* ` - g */
+-ESC_h, 0, 0, -ESC_k, 0, 0, ESC_n, 0, /* h - o */
+-ESC_p, 0, ESC_r, -ESC_s, ESC_tee, 0, -ESC_v, -ESC_w, /* p - w */
+ 0, 0, -ESC_z /* x - z */
+};
+
+#else /* This is the "abnormal" table for EBCDIC systems */
+static const short int escapes[] = {
+/* 48 */ 0, 0, 0, '.', '<', '(', '+', '|',
+/* 50 */ '&', 0, 0, 0, 0, 0, 0, 0,
+/* 58 */ 0, 0, '!', '$', '*', ')', ';', '~',
+/* 60 */ '-', '/', 0, 0, 0, 0, 0, 0,
+/* 68 */ 0, 0, '|', ',', '%', '_', '>', '?',
+/* 70 */ 0, 0, 0, 0, 0, 0, 0, 0,
+/* 78 */ 0, '`', ':', '#', '@', '\'', '=', '"',
+/* 80 */ 0, 7, -ESC_b, 0, -ESC_d, ESC_e, ESC_f, 0,
+/* 88 */-ESC_h, 0, 0, '{', 0, 0, 0, 0,
+/* 90 */ 0, 0, -ESC_k, 'l', 0, ESC_n, 0, -ESC_p,
+/* 98 */ 0, ESC_r, 0, '}', 0, 0, 0, 0,
+/* A0 */ 0, '~', -ESC_s, ESC_tee, 0,-ESC_v, -ESC_w, 0,
+/* A8 */ 0,-ESC_z, 0, 0, 0, '[', 0, 0,
+/* B0 */ 0, 0, 0, 0, 0, 0, 0, 0,
+/* B8 */ 0, 0, 0, 0, 0, ']', '=', '-',
+/* C0 */ '{',-ESC_A, -ESC_B, -ESC_C, -ESC_D,-ESC_E, 0, -ESC_G,
+/* C8 */-ESC_H, 0, 0, 0, 0, 0, 0, 0,
+/* D0 */ '}', 0, -ESC_K, 0, 0, 0, 0, -ESC_P,
+/* D8 */-ESC_Q,-ESC_R, 0, 0, 0, 0, 0, 0,
+/* E0 */ '\\', 0, -ESC_S, 0, 0,-ESC_V, -ESC_W, -ESC_X,
+/* E8 */ 0,-ESC_Z, 0, 0, 0, 0, 0, 0,
+/* F0 */ 0, 0, 0, 0, 0, 0, 0, 0,
+/* F8 */ 0, 0, 0, 0, 0, 0, 0, 0
+};
+#endif
+
+
+/* Table of special "verbs" like (*PRUNE). This is a short table, so it is
+searched linearly. Put all the names into a single string, in order to reduce
+the number of relocations when a shared library is dynamically linked. */
+
+typedef struct verbitem {
+ int len;
+ int op;
+} verbitem;
+
+static const char verbnames[] =
+ "ACCEPT\0"
+ "COMMIT\0"
+ "F\0"
+ "FAIL\0"
+ "PRUNE\0"
+ "SKIP\0"
+ "THEN";
+
+static verbitem verbs[] = {
+ { 6, OP_ACCEPT },
+ { 6, OP_COMMIT },
+ { 1, OP_FAIL },
+ { 4, OP_FAIL },
+ { 5, OP_PRUNE },
+ { 4, OP_SKIP },
+ { 4, OP_THEN }
+};
+
+static int verbcount = sizeof(verbs)/sizeof(verbitem);
+
+
+/* Tables of names of POSIX character classes and their lengths. The names are
+now all in a single string, to reduce the number of relocations when a shared
+library is dynamically loaded. The list of lengths is terminated by a zero
+length entry. The first three must be alpha, lower, upper, as this is assumed
+for handling case independence. */
+
+static const char posix_names[] =
+ "alpha\0" "lower\0" "upper\0" "alnum\0" "ascii\0" "blank\0"
+ "cntrl\0" "digit\0" "graph\0" "print\0" "punct\0" "space\0"
+ "word\0" "xdigit";
+
+static const uschar posix_name_lengths[] = {
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 6, 0 };
+
+/* Table of class bit maps for each POSIX class. Each class is formed from a
+base map, with an optional addition or removal of another map. Then, for some
+classes, there is some additional tweaking: for [:blank:] the vertical space
+characters are removed, and for [:alpha:] and [:alnum:] the underscore
+character is removed. The triples in the table consist of the base map offset,
+second map offset or -1 if no second map, and a non-negative value for map
+addition or a negative value for map subtraction (if there are two maps). The
+absolute value of the third field has these meanings: 0 => no tweaking, 1 =>
+remove vertical space characters, 2 => remove underscore. */
+
+static const int posix_class_maps[] = {
+ cbit_word, cbit_digit, -2, /* alpha */
+ cbit_lower, -1, 0, /* lower */
+ cbit_upper, -1, 0, /* upper */
+ cbit_word, -1, 2, /* alnum - word without underscore */
+ cbit_print, cbit_cntrl, 0, /* ascii */
+ cbit_space, -1, 1, /* blank - a GNU extension */
+ cbit_cntrl, -1, 0, /* cntrl */
+ cbit_digit, -1, 0, /* digit */
+ cbit_graph, -1, 0, /* graph */
+ cbit_print, -1, 0, /* print */
+ cbit_punct, -1, 0, /* punct */
+ cbit_space, -1, 0, /* space */
+ cbit_word, -1, 0, /* word - a Perl extension */
+ cbit_xdigit,-1, 0 /* xdigit */
+};
+
+
+#define STRING(a) # a
+#define XSTRING(s) STRING(s)
+
+/* The texts of compile-time error messages. These are "char *" because they
+are passed to the outside world. Do not ever re-use any error number, because
+they are documented. Always add a new error instead. Messages marked DEAD below
+are no longer used. This used to be a table of strings, but in order to reduce
+the number of relocations needed when a shared library is loaded dynamically,
+it is now one long string. We cannot use a table of offsets, because the
+lengths of inserts such as XSTRING(MAX_NAME_SIZE) are not known. Instead, we
+simply count through to the one we want - this isn't a performance issue
+because these strings are used only when there is a compilation error. */
+
+static const char error_texts[] =
+ "no error\0"
+ "\\ at end of pattern\0"
+ "\\c at end of pattern\0"
+ "unrecognized character follows \\\0"
+ "numbers out of order in {} quantifier\0"
+ /* 5 */
+ "number too big in {} quantifier\0"
+ "missing terminating ] for character class\0"
+ "invalid escape sequence in character class\0"
+ "range out of order in character class\0"
+ "nothing to repeat\0"
+ /* 10 */
+ "operand of unlimited repeat could match the empty string\0" /** DEAD **/
+ "internal error: unexpected repeat\0"
+ "unrecognized character after (? or (?-\0"
+ "POSIX named classes are supported only within a class\0"
+ "missing )\0"
+ /* 15 */
+ "reference to non-existent subpattern\0"
+ "erroffset passed as NULL\0"
+ "unknown option bit(s) set\0"
+ "missing ) after comment\0"
+ "parentheses nested too deeply\0" /** DEAD **/
+ /* 20 */
+ "regular expression is too large\0"
+ "failed to get memory\0"
+ "unmatched parentheses\0"
+ "internal error: code overflow\0"
+ "unrecognized character after (?<\0"
+ /* 25 */
+ "lookbehind assertion is not fixed length\0"
+ "malformed number or name after (?(\0"
+ "conditional group contains more than two branches\0"
+ "assertion expected after (?(\0"
+ "(?R or (?[+-]digits must be followed by )\0"
+ /* 30 */
+ "unknown POSIX class name\0"
+ "POSIX collating elements are not supported\0"
+ "this version of PCRE is not compiled with PCRE_UTF8 support\0"
+ "spare error\0" /** DEAD **/
+ "character value in \\x{...} sequence is too large\0"
+ /* 35 */
+ "invalid condition (?(0)\0"
+ "\\C not allowed in lookbehind assertion\0"
+ "PCRE does not support \\L, \\l, \\N, \\U, or \\u\0"
+ "number after (?C is > 255\0"
+ "closing ) for (?C expected\0"
+ /* 40 */
+ "recursive call could loop indefinitely\0"
+ "unrecognized character after (?P\0"
+ "syntax error in subpattern name (missing terminator)\0"
+ "two named subpatterns have the same name\0"
+ "invalid UTF-8 string\0"
+ /* 45 */
+ "support for \\P, \\p, and \\X has not been compiled\0"
+ "malformed \\P or \\p sequence\0"
+ "unknown property name after \\P or \\p\0"
+ "subpattern name is too long (maximum " XSTRING(MAX_NAME_SIZE) " characters)\0"
+ "too many named subpatterns (maximum " XSTRING(MAX_NAME_COUNT) ")\0"
+ /* 50 */
+ "repeated subpattern is too long\0" /** DEAD **/
+ "octal value is greater than \\377 (not in UTF-8 mode)\0"
+ "internal error: overran compiling workspace\0"
+ "internal error: previously-checked referenced subpattern not found\0"
+ "DEFINE group contains more than one branch\0"
+ /* 55 */
+ "repeating a DEFINE group is not allowed\0"
+ "inconsistent NEWLINE options\0"
+ "\\g is not followed by a braced name or an optionally braced non-zero number\0"
+ "(?+ or (?- or (?(+ or (?(- must be followed by a non-zero number\0"
+ "(*VERB) with an argument is not supported\0"
+ /* 60 */
+ "(*VERB) not recognized\0"
+ "number is too big\0"
+ "subpattern name expected\0"
+ "digit expected after (?+";
+
+
+/* Table to identify digits and hex digits. This is used when compiling
+patterns. Note that the tables in chartables are dependent on the locale, and
+may mark arbitrary characters as digits - but the PCRE compiling code expects
+to handle only 0-9, a-z, and A-Z as digits when compiling. That is why we have
+a private table here. It costs 256 bytes, but it is a lot faster than doing
+character value tests (at least in some simple cases I timed), and in some
+applications one wants PCRE to compile efficiently as well as match
+efficiently.
+
+For convenience, we use the same bit definitions as in chartables:
+
+ 0x04 decimal digit
+ 0x08 hexadecimal digit
+
+Then we can use ctype_digit and ctype_xdigit in the code. */
+
+#ifndef EBCDIC /* This is the "normal" case, for ASCII systems */
+static const unsigned char digitab[] =
+ {
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - ' */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ( - / */
+ 0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 */
+ 0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00, /* 8 - ? */
+ 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* @ - G */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H - O */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* P - W */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* X - _ */
+ 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* ` - g */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h - o */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* p - w */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 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 */
+
+#else /* This is the "abnormal" case, for EBCDIC systems */
+static const unsigned char digitab[] =
+ {
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 0- 7 0 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 8- 15 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 16- 23 10 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 32- 39 20 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 30 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 40 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 72- | */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 50 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 88- 95 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 60 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 104- ? */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 70 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
+ 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* 128- g 80 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 144- p 90 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 160- x A0 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 B0 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
+ 0x00,0x08,0x08,0x08,0x08,0x08,0x08,0x00, /* { - G C0 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* } - P D0 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* \ - X E0 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
+ 0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c,0x0c, /* 0 - 7 F0 */
+ 0x0c,0x0c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
+
+static const unsigned char ebcdic_chartab[] = { /* chartable partial dup */
+ 0x80,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 0- 7 */
+ 0x00,0x00,0x00,0x00,0x01,0x01,0x00,0x00, /* 8- 15 */
+ 0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 16- 23 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 24- 31 */
+ 0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00, /* 32- 39 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 40- 47 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 48- 55 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 56- 63 */
+ 0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - 71 */
+ 0x00,0x00,0x00,0x80,0x00,0x80,0x80,0x80, /* 72- | */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* & - 87 */
+ 0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00, /* 88- 95 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* - -103 */
+ 0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x80, /* 104- ? */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 112-119 */
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* 120- " */
+ 0x00,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* 128- g */
+ 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* h -143 */
+ 0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* 144- p */
+ 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* q -159 */
+ 0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* 160- x */
+ 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* y -175 */
+ 0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00, /* ^ -183 */
+ 0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00, /* 184-191 */
+ 0x80,0x1a,0x1a,0x1a,0x1a,0x1a,0x1a,0x12, /* { - G */
+ 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* H -207 */
+ 0x00,0x12,0x12,0x12,0x12,0x12,0x12,0x12, /* } - P */
+ 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Q -223 */
+ 0x00,0x00,0x12,0x12,0x12,0x12,0x12,0x12, /* \ - X */
+ 0x12,0x12,0x00,0x00,0x00,0x00,0x00,0x00, /* Y -239 */
+ 0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c,0x1c, /* 0 - 7 */
+ 0x1c,0x1c,0x00,0x00,0x00,0x00,0x00,0x00};/* 8 -255 */
+#endif
+
+
+/* Definition to allow mutual recursion */
+
+static BOOL
+ compile_regex(int, int, uschar **, const uschar **, int *, BOOL, BOOL, int,
+ int *, int *, branch_chain *, compile_data *, int *);
+
+
+
+/*************************************************
+* Find an error text *
+*************************************************/
+
+/* The error texts are now all in one long string, to save on relocations. As
+some of the text is of unknown length, we can't use a table of offsets.
+Instead, just count through the strings. This is not a performance issue
+because it happens only when there has been a compilation error.
+
+Argument: the error number
+Returns: pointer to the error string
+*/
+
+static const char *
+find_error_text(int n)
+{
+const char *s = error_texts;
+for (; n > 0; n--) while (*s++ != 0);
+return s;
+}
+
+
+/*************************************************
+* 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. A backreference to group
+n is returned as -(ESC_REF + n); ESC_REF is the highest ESC_xxx macro. When
+UTF-8 is enabled, a positive value greater than 255 may be returned. 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
+ errorcodeptr points to the errorcode variable
+ bracount number of previous extracting brackets
+ options the options bits
+ isclass TRUE if inside a character class
+
+Returns: zero or positive => a data character
+ negative => a special escape sequence
+ on error, errorcodeptr is set
+*/
+
+static int
+check_escape(const uschar **ptrptr, int *errorcodeptr, int bracount,
+ int options, BOOL isclass)
+{
+BOOL utf8 = (options & PCRE_UTF8) != 0;
+const uschar *ptr = *ptrptr + 1;
+int c, i;
+
+GETCHARINCTEST(c, ptr); /* Get character value, increment pointer */
+ptr--; /* Set pointer back to the last byte */
+
+/* If backslash is at the end of the pattern, it's an error. */
+if (c == 0) *errorcodeptr = ERR1;
+
+/* Non-alphanumerics are literals. For digits or letters, do an initial lookup
+in a table. A non-zero result is something that can be returned immediately.
+Otherwise further processing may be required. */
+
+#ifndef EBCDIC /* ASCII coding */
+else if (c < '0' || c > 'z') {} /* Not alphanumeric */
+else if ((i = escapes[c - '0']) != 0) c = i;
+
+#else /* EBCDIC coding */
+else if (c < 'a' || (ebcdic_chartab[c] & 0x0E) == 0) {} /* Not alphanumeric */
+else if ((i = escapes[c - 0x48]) != 0) c = i;
+#endif
+
+/* Escapes that need further processing, or are illegal. */
+
+else
+ {
+ const uschar *oldptr;
+ BOOL braced, negated;
+
+ switch (c)
+ {
+ /* A number of Perl escapes are not handled by PCRE. We give an explicit
+ error. */
+
+ case 'l':
+ case 'L':
+ case 'N':
+ case 'u':
+ case 'U':
+ *errorcodeptr = ERR37;
+ break;
+
+ /* \g must be followed by a number, either plain or braced. If positive, it
+ is an absolute backreference. If negative, it is a relative backreference.
+ This is a Perl 5.10 feature. Perl 5.10 also supports \g{name} as a
+ reference to a named group. This is part of Perl's movement towards a
+ unified syntax for back references. As this is synonymous with \k{name}, we
+ fudge it up by pretending it really was \k. */
+
+ case 'g':
+ if (ptr[1] == '{')
+ {
+ const uschar *p;
+ for (p = ptr+2; *p != 0 && *p != '}'; p++)
+ if (*p != '-' && (digitab[*p] & ctype_digit) == 0) break;
+ if (*p != 0 && *p != '}')
+ {
+ c = -ESC_k;
+ break;
+ }
+ braced = TRUE;
+ ptr++;
+ }
+ else braced = FALSE;
+
+ if (ptr[1] == '-')
+ {
+ negated = TRUE;
+ ptr++;
+ }
+ else negated = FALSE;
+
+ c = 0;
+ while ((digitab[ptr[1]] & ctype_digit) != 0)
+ c = c * 10 + *(++ptr) - '0';
+
+ if (c < 0)
+ {
+ *errorcodeptr = ERR61;
+ break;
+ }
+
+ if (c == 0 || (braced && *(++ptr) != '}'))
+ {
+ *errorcodeptr = ERR57;
+ break;
+ }
+
+ if (negated)
+ {
+ if (c > bracount)
+ {
+ *errorcodeptr = ERR15;
+ break;
+ }
+ c = bracount - (c - 1);
+ }
+
+ c = -(ESC_REF + c);
+ break;
+
+ /* The handling of escape sequences consisting of a string of digits
+ starting with one that is not zero is not straightforward. By experiment,
+ the way Perl works seems to be as follows:
+
+ Outside a character class, the digits are read as a decimal number. If the
+ number is less than 10, or if there are that many previous extracting
+ left brackets, then it is a back reference. Otherwise, up to three octal
+ digits are read to form an escaped byte. Thus \123 is likely to be octal
+ 123 (cf \0123, which is octal 012 followed by the literal 3). If the octal
+ value is greater than 377, the least significant 8 bits are taken. Inside a
+ character class, \ followed by a digit is always an octal number. */
+
+ case '1': case '2': case '3': case '4': case '5':
+ case '6': case '7': case '8': case '9':
+
+ if (!isclass)
+ {
+ oldptr = ptr;
+ c -= '0';
+ while ((digitab[ptr[1]] & ctype_digit) != 0)
+ c = c * 10 + *(++ptr) - '0';
+ if (c < 0)
+ {
+ *errorcodeptr = ERR61;
+ break;
+ }
+ if (c < 10 || c <= bracount)
+ {
+ c = -(ESC_REF + c);
+ break;
+ }
+ ptr = oldptr; /* Put the pointer back and fall through */
+ }
+
+ /* Handle an octal number following \. If the first digit is 8 or 9, Perl
+ generates a binary zero byte and treats the digit as a following literal.
+ Thus we have to pull back the pointer by one. */
+
+ if ((c = *ptr) >= '8')
+ {
+ ptr--;
+ c = 0;
+ break;
+ }
+
+ /* \0 always starts an octal number, but we may drop through to here with a
+ larger first octal digit. The original code used just to take the least
+ significant 8 bits of octal numbers (I think this is what early Perls used
+ to do). Nowadays we allow for larger numbers in UTF-8 mode, but no more
+ than 3 octal digits. */
+
+ case '0':
+ c -= '0';
+ while(i++ < 2 && ptr[1] >= '0' && ptr[1] <= '7')
+ c = c * 8 + *(++ptr) - '0';
+ if (!utf8 && c > 255) *errorcodeptr = ERR51;
+ break;
+
+ /* \x is complicated. \x{ddd} is a character number which can be greater
+ than 0xff in utf8 mode, but only if the ddd are hex digits. If not, { is
+ treated as a data character. */
+
+ case 'x':
+ if (ptr[1] == '{')
+ {
+ const uschar *pt = ptr + 2;
+ int count = 0;
+
+ c = 0;
+ while ((digitab[*pt] & ctype_xdigit) != 0)
+ {
+ register int cc = *pt++;
+ if (c == 0 && cc == '0') continue; /* Leading zeroes */
+ count++;
+
+#ifndef EBCDIC /* ASCII coding */
+ if (cc >= 'a') cc -= 32; /* Convert to upper case */
+ c = (c << 4) + cc - ((cc < 'A')? '0' : ('A' - 10));
+#else /* EBCDIC coding */
+ if (cc >= 'a' && cc <= 'z') cc += 64; /* Convert to upper case */
+ c = (c << 4) + cc - ((cc >= '0')? '0' : ('A' - 10));
+#endif
+ }
+
+ if (*pt == '}')
+ {
+ if (c < 0 || count > (utf8? 8 : 2)) *errorcodeptr = ERR34;
+ ptr = pt;
+ break;
+ }
+
+ /* If the sequence of hex digits does not end with '}', then we don't
+ recognize this construct; fall through to the normal \x handling. */
+ }
+
+ /* Read just a single-byte hex-defined char */
+
+ c = 0;
+ while (i++ < 2 && (digitab[ptr[1]] & ctype_xdigit) != 0)
+ {
+ int cc; /* Some compilers don't like ++ */
+ cc = *(++ptr); /* in initializers */
+#ifndef EBCDIC /* ASCII coding */
+ if (cc >= 'a') cc -= 32; /* Convert to upper case */
+ c = c * 16 + cc - ((cc < 'A')? '0' : ('A' - 10));
+#else /* EBCDIC coding */
+ if (cc <= 'z') cc += 64; /* Convert to upper case */
+ c = c * 16 + cc - ((cc >= '0')? '0' : ('A' - 10));
+#endif
+ }
+ break;
+
+ /* For \c, a following letter is upper-cased; then the 0x40 bit is flipped.
+ This coding is ASCII-specific, but then the whole concept of \cx is
+ ASCII-specific. (However, an EBCDIC equivalent has now been added.) */
+
+ case 'c':
+ c = *(++ptr);
+ if (c == 0)
+ {
+ *errorcodeptr = ERR2;
+ break;
+ }
+
+#ifndef EBCDIC /* ASCII coding */
+ if (c >= 'a' && c <= 'z') c -= 32;
+ c ^= 0x40;
+#else /* EBCDIC coding */
+ if (c >= 'a' && c <= 'z') c += 64;
+ c ^= 0xC0;
+#endif
+ break;
+
+ /* PCRE_EXTRA enables extensions to Perl in the matter of escapes. Any
+ other alphanumeric following \ is an error if PCRE_EXTRA was set;
+ otherwise, for Perl compatibility, it is a literal. This code looks a bit
+ odd, but there used to be some cases other than the default, and there may
+ be again in future, so I haven't "optimized" it. */
+
+ default:
+ if ((options & PCRE_EXTRA) != 0) switch(c)
+ {
+ default:
+ *errorcodeptr = ERR3;
+ break;
+ }
+ break;
+ }
+ }
+
+*ptrptr = ptr;
+return c;
+}
+
+
+
+#ifdef SUPPORT_UCP
+/*************************************************
+* Handle \P and \p *
+*************************************************/
+
+/* This function is called after \P or \p has been encountered, provided that
+PCRE is compiled with support for Unicode properties. On entry, ptrptr is
+pointing at the P or p. On exit, it is pointing at the final character of the
+escape sequence.
+
+Argument:
+ ptrptr points to the pattern position pointer
+ negptr points to a boolean that is set TRUE for negation else FALSE
+ dptr points to an int that is set to the detailed property value
+ errorcodeptr points to the error code variable
+
+Returns: type value from ucp_type_table, or -1 for an invalid type
+*/
+
+static int
+get_ucp(const uschar **ptrptr, BOOL *negptr, int *dptr, int *errorcodeptr)
+{
+int c, i, bot, top;
+const uschar *ptr = *ptrptr;
+char name[32];
+
+c = *(++ptr);
+if (c == 0) goto ERROR_RETURN;
+
+*negptr = FALSE;
+
+/* \P or \p can be followed by a name in {}, optionally preceded by ^ for
+negation. */
+
+if (c == '{')
+ {
+ if (ptr[1] == '^')
+ {
+ *negptr = TRUE;
+ ptr++;
+ }
+ for (i = 0; i < (int)sizeof(name) - 1; i++)
+ {
+ c = *(++ptr);
+ if (c == 0) goto ERROR_RETURN;
+ if (c == '}') break;
+ name[i] = c;
+ }
+ if (c !='}') goto ERROR_RETURN;
+ name[i] = 0;
+ }
+
+/* Otherwise there is just one following character */
+
+else
+ {
+ name[0] = c;
+ name[1] = 0;
+ }
+
+*ptrptr = ptr;
+
+/* Search for a recognized property name using binary chop */
+
+bot = 0;
+top = _erts_pcre_utt_size;
+
+while (bot < top)
+ {
+ i = (bot + top) >> 1;
+ c = strcmp(name, _erts_pcre_utt_names + _erts_pcre_utt[i].name_offset);
+ if (c == 0)
+ {
+ *dptr = _erts_pcre_utt[i].value;
+ return _erts_pcre_utt[i].type;
+ }
+ if (c > 0) bot = i + 1; else top = i;
+ }
+
+*errorcodeptr = ERR47;
+*ptrptr = ptr;
+return -1;
+
+ERROR_RETURN:
+*errorcodeptr = ERR46;
+*ptrptr = ptr;
+return -1;
+}
+#endif
+
+
+
+
+/*************************************************
+* Check for counted repeat *
+*************************************************/
+
+/* This function is called when a '{' is encountered in a place where it might
+start a quantifier. It looks ahead to see if it really is a quantifier or not.
+It is only a quantifier if it is one of the forms {ddd} {ddd,} or {ddd,ddd}
+where the ddds are digits.
+
+Arguments:
+ p pointer to the first char after '{'
+
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+is_counted_repeat(const uschar *p)
+{
+if ((digitab[*p++] & ctype_digit) == 0) return FALSE;
+while ((digitab[*p] & ctype_digit) != 0) p++;
+if (*p == '}') return TRUE;
+
+if (*p++ != ',') return FALSE;
+if (*p == '}') return TRUE;
+
+if ((digitab[*p++] & ctype_digit) == 0) return FALSE;
+while ((digitab[*p] & ctype_digit) != 0) p++;
+
+return (*p == '}');
+}
+
+
+
+/*************************************************
+* Read repeat counts *
+*************************************************/
+
+/* Read an item of the form {n,m} and return the values. This is called only
+after is_counted_repeat() has confirmed that a repeat-count quantifier exists,
+so the syntax is guaranteed to be correct, but we need to check 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
+ errorcodeptr points to error code variable
+
+Returns: pointer to '}' on success;
+ current ptr on error, with errorcodeptr set non-zero
+*/
+
+static const uschar *
+read_repeat_counts(const uschar *p, int *minp, int *maxp, int *errorcodeptr)
+{
+int min = 0;
+int max = -1;
+
+/* Read the minimum value and do a paranoid check: a negative value indicates
+an integer overflow. */
+
+while ((digitab[*p] & ctype_digit) != 0) min = min * 10 + *p++ - '0';
+if (min < 0 || min > 65535)
+ {
+ *errorcodeptr = ERR5;
+ return p;
+ }
+
+/* Read the maximum value if there is one, and again do a paranoid on its size.
+Also, max must not be less than min. */
+
+if (*p == '}') max = min; else
+ {
+ if (*(++p) != '}')
+ {
+ max = 0;
+ while((digitab[*p] & ctype_digit) != 0) max = max * 10 + *p++ - '0';
+ if (max < 0 || max > 65535)
+ {
+ *errorcodeptr = ERR5;
+ return p;
+ }
+ if (max < min)
+ {
+ *errorcodeptr = ERR4;
+ return p;
+ }
+ }
+ }
+
+/* Fill in the required variables, and pass back the pointer to the terminating
+'}'. */
+
+*minp = min;
+*maxp = max;
+return p;
+}
+
+
+
+/*************************************************
+* Find forward referenced subpattern *
+*************************************************/
+
+/* This function scans along a pattern's text looking for capturing
+subpatterns, and counting them. If it finds a named pattern that matches the
+name it is given, it returns its number. Alternatively, if the name is NULL, it
+returns when it reaches a given numbered subpattern. This is used for forward
+references to subpatterns. We know that if (?P< is encountered, the name will
+be terminated by '>' because that is checked in the first pass.
+
+Arguments:
+ ptr current position in the pattern
+ count current count of capturing parens so far encountered
+ name name to seek, or NULL if seeking a numbered subpattern
+ lorn name length, or subpattern number if name is NULL
+ xmode TRUE if we are in /x mode
+
+Returns: the number of the named subpattern, or -1 if not found
+*/
+
+static int
+find_parens(const uschar *ptr, int count, const uschar *name, int lorn,
+ BOOL xmode)
+{
+const uschar *thisname;
+
+for (; *ptr != 0; ptr++)
+ {
+ int term;
+
+ /* Skip over backslashed characters and also entire \Q...\E */
+
+ if (*ptr == '\\')
+ {
+ if (*(++ptr) == 0) return -1;
+ if (*ptr == 'Q') for (;;)
+ {
+ while (*(++ptr) != 0 && *ptr != '\\');
+ if (*ptr == 0) return -1;
+ if (*(++ptr) == 'E') break;
+ }
+ continue;
+ }
+
+ /* Skip over character classes */
+
+ if (*ptr == '[')
+ {
+ while (*(++ptr) != ']')
+ {
+ if (*ptr == 0) return -1;
+ if (*ptr == '\\')
+ {
+ if (*(++ptr) == 0) return -1;
+ if (*ptr == 'Q') for (;;)
+ {
+ while (*(++ptr) != 0 && *ptr != '\\');
+ if (*ptr == 0) return -1;
+ if (*(++ptr) == 'E') break;
+ }
+ continue;
+ }
+ }
+ continue;
+ }
+
+ /* Skip comments in /x mode */
+
+ if (xmode && *ptr == '#')
+ {
+ while (*(++ptr) != 0 && *ptr != '\n');
+ if (*ptr == 0) return -1;
+ continue;
+ }
+
+ /* An opening parens must now be a real metacharacter */
+
+ if (*ptr != '(') continue;
+ if (ptr[1] != '?' && ptr[1] != '*')
+ {
+ count++;
+ if (name == NULL && count == lorn) return count;
+ continue;
+ }
+
+ ptr += 2;
+ if (*ptr == 'P') ptr++; /* Allow optional P */
+
+ /* We have to disambiguate (?<! and (?<= from (?<name> */
+
+ if ((*ptr != '<' || ptr[1] == '!' || ptr[1] == '=') &&
+ *ptr != '\'')
+ continue;
+
+ count++;
+
+ if (name == NULL && count == lorn) return count;
+ term = *ptr++;
+ if (term == '<') term = '>';
+ thisname = ptr;
+ while (*ptr != term) ptr++;
+ if (name != NULL && lorn == ptr - thisname &&
+ strncmp((const char *)name, (const char *)thisname, lorn) == 0)
+ return count;
+ }
+
+return -1;
+}
+
+
+
+/*************************************************
+* Find first significant op code *
+*************************************************/
+
+/* This is called by several functions that scan a compiled expression looking
+for a fixed first character, or an anchoring op code etc. It skips over things
+that do not influence this. For some calls, a change of option is important.
+For some calls, it makes sense to skip negative forward and all backward
+assertions, and also the \b assertion; for others it does not.
+
+Arguments:
+ code pointer to the start of the group
+ options pointer to external options
+ optbit the option bit whose changing is significant, or
+ zero if none are
+ skipassert TRUE if certain assertions are to be skipped
+
+Returns: pointer to the first significant opcode
+*/
+
+static const uschar*
+first_significant_code(const uschar *code, int *options, int optbit,
+ BOOL skipassert)
+{
+for (;;)
+ {
+ switch ((int)*code)
+ {
+ case OP_OPT:
+ if (optbit > 0 && ((int)code[1] & optbit) != (*options & optbit))
+ *options = (int)code[1];
+ code += 2;
+ break;
+
+ case OP_ASSERT_NOT:
+ case OP_ASSERTBACK:
+ case OP_ASSERTBACK_NOT:
+ if (!skipassert) return code;
+ do code += GET(code, 1); while (*code == OP_ALT);
+ code += _erts_pcre_OP_lengths[*code];
+ break;
+
+ case OP_WORD_BOUNDARY:
+ case OP_NOT_WORD_BOUNDARY:
+ if (!skipassert) return code;
+ /* Fall through */
+
+ case OP_CALLOUT:
+ case OP_CREF:
+ case OP_RREF:
+ case OP_DEF:
+ code += _erts_pcre_OP_lengths[*code];
+ break;
+
+ default:
+ return code;
+ }
+ }
+/* Control never reaches here */
+}
+
+
+
+
+/*************************************************
+* Find the fixed length of a pattern *
+*************************************************/
+
+/* Scan a pattern and compute the fixed length of subject that will match it,
+if the length is fixed. This is needed for dealing with backward assertions.
+In UTF8 mode, the result is in characters rather than bytes.
+
+Arguments:
+ code points to the start of the pattern (the bracket)
+ options the compiling options
+
+Returns: the fixed length, or -1 if there is no fixed length,
+ or -2 if \C was encountered
+*/
+
+static int
+find_fixedlength(uschar *code, int options)
+{
+int length = -1;
+
+register int branchlength = 0;
+register uschar *cc = code + 1 + LINK_SIZE;
+
+/* Scan along the opcodes for this branch. If we get to the end of the
+branch, check the length against that of the other branches. */
+
+for (;;)
+ {
+ int d;
+ register int op = *cc;
+ switch (op)
+ {
+ case OP_CBRA:
+ case OP_BRA:
+ case OP_ONCE:
+ case OP_COND:
+ d = find_fixedlength(cc + ((op == OP_CBRA)? 2:0), options);
+ if (d < 0) return d;
+ branchlength += d;
+ do cc += GET(cc, 1); while (*cc == OP_ALT);
+ cc += 1 + LINK_SIZE;
+ break;
+
+ /* Reached end of a branch; if it's a ket it is the end of a nested
+ call. If it's ALT it is an alternation in a nested call. If it is
+ END it's the end of the outer call. All can be handled by the same code. */
+
+ case OP_ALT:
+ case OP_KET:
+ case OP_KETRMAX:
+ case OP_KETRMIN:
+ case OP_END:
+ if (length < 0) length = branchlength;
+ else if (length != branchlength) return -1;
+ if (*cc != OP_ALT) return length;
+ cc += 1 + LINK_SIZE;
+ branchlength = 0;
+ break;
+
+ /* Skip over assertive subpatterns */
+
+ case OP_ASSERT:
+ case OP_ASSERT_NOT:
+ case OP_ASSERTBACK:
+ case OP_ASSERTBACK_NOT:
+ do cc += GET(cc, 1); while (*cc == OP_ALT);
+ /* Fall through */
+
+ /* Skip over things that don't match chars */
+
+ case OP_REVERSE:
+ case OP_CREF:
+ case OP_RREF:
+ case OP_DEF:
+ case OP_OPT:
+ case OP_CALLOUT:
+ case OP_SOD:
+ case OP_SOM:
+ case OP_EOD:
+ case OP_EODN:
+ case OP_CIRC:
+ case OP_DOLL:
+ case OP_NOT_WORD_BOUNDARY:
+ case OP_WORD_BOUNDARY:
+ cc += _erts_pcre_OP_lengths[*cc];
+ break;
+
+ /* Handle literal characters */
+
+ case OP_CHAR:
+ case OP_CHARNC:
+ case OP_NOT:
+ branchlength++;
+ cc += 2;
+#ifdef SUPPORT_UTF8
+ if ((options & PCRE_UTF8) != 0)
+ {
+ while ((*cc & 0xc0) == 0x80) cc++;
+ }
+#endif
+ break;
+
+ /* Handle exact repetitions. The count is already in characters, but we
+ need to skip over a multibyte character in UTF8 mode. */
+
+ case OP_EXACT:
+ branchlength += GET2(cc,1);
+ cc += 4;
+#ifdef SUPPORT_UTF8
+ if ((options & PCRE_UTF8) != 0)
+ {
+ while((*cc & 0x80) == 0x80) cc++;
+ }
+#endif
+ break;
+
+ case OP_TYPEEXACT:
+ branchlength += GET2(cc,1);
+ if (cc[3] == OP_PROP || cc[3] == OP_NOTPROP) cc += 2;
+ cc += 4;
+ break;
+
+ /* Handle single-char matchers */
+
+ case OP_PROP:
+ case OP_NOTPROP:
+ cc += 2;
+ /* Fall through */
+
+ case OP_NOT_DIGIT:
+ case OP_DIGIT:
+ case OP_NOT_WHITESPACE:
+ case OP_WHITESPACE:
+ case OP_NOT_WORDCHAR:
+ case OP_WORDCHAR:
+ case OP_ANY:
+ branchlength++;
+ cc++;
+ break;
+
+ /* The single-byte matcher isn't allowed */
+
+ case OP_ANYBYTE:
+ return -2;
+
+ /* Check a class for variable quantification */
+
+#ifdef SUPPORT_UTF8
+ case OP_XCLASS:
+ cc += GET(cc, 1) - 33;
+ /* Fall through */
+#endif
+
+ case OP_CLASS:
+ case OP_NCLASS:
+ cc += 33;
+
+ switch (*cc)
+ {
+ case OP_CRSTAR:
+ case OP_CRMINSTAR:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ return -1;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ if (GET2(cc,1) != GET2(cc,3)) return -1;
+ branchlength += GET2(cc,1);
+ cc += 5;
+ break;
+
+ default:
+ branchlength++;
+ }
+ break;
+
+ /* Anything else is variable length */
+
+ default:
+ return -1;
+ }
+ }
+/* Control never gets here */
+}
+
+
+
+
+/*************************************************
+* Scan compiled regex for numbered bracket *
+*************************************************/
+
+/* This little function scans through a compiled pattern until it finds a
+capturing bracket with the given number.
+
+Arguments:
+ code points to start of expression
+ utf8 TRUE in UTF-8 mode
+ number the required bracket number
+
+Returns: pointer to the opcode for the bracket, or NULL if not found
+*/
+
+static const uschar *
+find_bracket(const uschar *code, BOOL utf8, int number)
+{
+for (;;)
+ {
+ register int c = *code;
+ if (c == OP_END) return NULL;
+
+ /* XCLASS is used for classes that cannot be represented just by a bit
+ map. This includes negated single high-valued characters. The length in
+ the table is zero; the actual length is stored in the compiled code. */
+
+ if (c == OP_XCLASS) code += GET(code, 1);
+
+ /* Handle capturing bracket */
+
+ else if (c == OP_CBRA)
+ {
+ int n = GET2(code, 1+LINK_SIZE);
+ if (n == number) return (uschar *)code;
+ code += _erts_pcre_OP_lengths[c];
+ }
+
+ /* Otherwise, we can get the item's length from the table, except that for
+ repeated character types, we have to test for \p and \P, which have an extra
+ two bytes of parameters. */
+
+ else
+ {
+ switch(c)
+ {
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEPLUS:
+ case OP_TYPEMINPLUS:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ case OP_TYPEPOSSTAR:
+ case OP_TYPEPOSPLUS:
+ case OP_TYPEPOSQUERY:
+ if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
+ break;
+
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ case OP_TYPEEXACT:
+ case OP_TYPEPOSUPTO:
+ if (code[3] == OP_PROP || code[3] == OP_NOTPROP) code += 2;
+ break;
+ }
+
+ /* Add in the fixed length from the table */
+
+ code += _erts_pcre_OP_lengths[c];
+
+ /* In UTF-8 mode, opcodes that are followed by a character may be followed by
+ a multi-byte character. The length in the table is a minimum, so we have to
+ arrange to skip the extra bytes. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8) switch(c)
+ {
+ case OP_CHAR:
+ case OP_CHARNC:
+ case OP_EXACT:
+ case OP_UPTO:
+ case OP_MINUPTO:
+ case OP_POSUPTO:
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_POSSTAR:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_POSPLUS:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ case OP_POSQUERY:
+ if (code[-1] >= 0xc0) code += _erts_pcre_utf8_table4[code[-1] & 0x3f];
+ break;
+ }
+#endif
+ }
+ }
+}
+
+
+
+/*************************************************
+* Scan compiled regex for recursion reference *
+*************************************************/
+
+/* This little function scans through a compiled pattern until it finds an
+instance of OP_RECURSE.
+
+Arguments:
+ code points to start of expression
+ utf8 TRUE in UTF-8 mode
+
+Returns: pointer to the opcode for OP_RECURSE, or NULL if not found
+*/
+
+static const uschar *
+find_recurse(const uschar *code, BOOL utf8)
+{
+for (;;)
+ {
+ register int c = *code;
+ if (c == OP_END) return NULL;
+ if (c == OP_RECURSE) return code;
+
+ /* XCLASS is used for classes that cannot be represented just by a bit
+ map. This includes negated single high-valued characters. The length in
+ the table is zero; the actual length is stored in the compiled code. */
+
+ if (c == OP_XCLASS) code += GET(code, 1);
+
+ /* Otherwise, we can get the item's length from the table, except that for
+ repeated character types, we have to test for \p and \P, which have an extra
+ two bytes of parameters. */
+
+ else
+ {
+ switch(c)
+ {
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEPLUS:
+ case OP_TYPEMINPLUS:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ case OP_TYPEPOSSTAR:
+ case OP_TYPEPOSPLUS:
+ case OP_TYPEPOSQUERY:
+ if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
+ break;
+
+ case OP_TYPEPOSUPTO:
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ case OP_TYPEEXACT:
+ if (code[3] == OP_PROP || code[3] == OP_NOTPROP) code += 2;
+ break;
+ }
+
+ /* Add in the fixed length from the table */
+
+ code += _erts_pcre_OP_lengths[c];
+
+ /* In UTF-8 mode, opcodes that are followed by a character may be followed
+ by a multi-byte character. The length in the table is a minimum, so we have
+ to arrange to skip the extra bytes. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8) switch(c)
+ {
+ case OP_CHAR:
+ case OP_CHARNC:
+ case OP_EXACT:
+ case OP_UPTO:
+ case OP_MINUPTO:
+ case OP_POSUPTO:
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_POSSTAR:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_POSPLUS:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ case OP_POSQUERY:
+ if (code[-1] >= 0xc0) code += _erts_pcre_utf8_table4[code[-1] & 0x3f];
+ break;
+ }
+#endif
+ }
+ }
+}
+
+
+
+/*************************************************
+* Scan compiled branch for non-emptiness *
+*************************************************/
+
+/* This function scans through a branch of a compiled pattern to see whether it
+can match the empty string or not. It is called from could_be_empty()
+below and from compile_branch() when checking for an unlimited repeat of a
+group that can match nothing. Note that first_significant_code() skips over
+backward and negative forward assertions when its final argument is TRUE. If we
+hit an unclosed bracket, we return "empty" - this means we've struck an inner
+bracket whose current branch will already have been scanned.
+
+Arguments:
+ code points to start of search
+ endcode points to where to stop
+ utf8 TRUE if in UTF8 mode
+
+Returns: TRUE if what is matched could be empty
+*/
+
+static BOOL
+could_be_empty_branch(const uschar *code, const uschar *endcode, BOOL utf8)
+{
+register int c;
+for (code = first_significant_code(code + _erts_pcre_OP_lengths[*code], NULL, 0, TRUE);
+ code < endcode;
+ code = first_significant_code(code + _erts_pcre_OP_lengths[c], NULL, 0, TRUE))
+ {
+ const uschar *ccode;
+
+ c = *code;
+
+ /* Skip over forward assertions; the other assertions are skipped by
+ first_significant_code() with a TRUE final argument. */
+
+ if (c == OP_ASSERT)
+ {
+ do code += GET(code, 1); while (*code == OP_ALT);
+ c = *code;
+ continue;
+ }
+
+ /* Groups with zero repeats can of course be empty; skip them. */
+
+ if (c == OP_BRAZERO || c == OP_BRAMINZERO)
+ {
+ code += _erts_pcre_OP_lengths[c];
+ do code += GET(code, 1); while (*code == OP_ALT);
+ c = *code;
+ continue;
+ }
+
+ /* For other groups, scan the branches. */
+
+ if (c == OP_BRA || c == OP_CBRA || c == OP_ONCE || c == OP_COND)
+ {
+ BOOL empty_branch;
+ if (GET(code, 1) == 0) return TRUE; /* Hit unclosed bracket */
+
+ /* Scan a closed bracket */
+
+ empty_branch = FALSE;
+ do
+ {
+ if (!empty_branch && could_be_empty_branch(code, endcode, utf8))
+ empty_branch = TRUE;
+ code += GET(code, 1);
+ }
+ while (*code == OP_ALT);
+ if (!empty_branch) return FALSE; /* All branches are non-empty */
+ c = *code;
+ continue;
+ }
+
+ /* Handle the other opcodes */
+
+ switch (c)
+ {
+ /* Check for quantifiers after a class. XCLASS is used for classes that
+ cannot be represented just by a bit map. This includes negated single
+ high-valued characters. The length in _erts_pcre_OP_lengths[] is zero; the
+ actual length is stored in the compiled code, so we must update "code"
+ here. */
+
+#ifdef SUPPORT_UTF8
+ case OP_XCLASS:
+ ccode = code += GET(code, 1);
+ goto CHECK_CLASS_REPEAT;
+#endif
+
+ case OP_CLASS:
+ case OP_NCLASS:
+ ccode = code + 33;
+
+#ifdef SUPPORT_UTF8
+ CHECK_CLASS_REPEAT:
+#endif
+
+ switch (*ccode)
+ {
+ case OP_CRSTAR: /* These could be empty; continue */
+ case OP_CRMINSTAR:
+ case OP_CRQUERY:
+ case OP_CRMINQUERY:
+ break;
+
+ default: /* Non-repeat => class must match */
+ case OP_CRPLUS: /* These repeats aren't empty */
+ case OP_CRMINPLUS:
+ return FALSE;
+
+ case OP_CRRANGE:
+ case OP_CRMINRANGE:
+ if (GET2(ccode, 1) > 0) return FALSE; /* Minimum > 0 */
+ break;
+ }
+ break;
+
+ /* Opcodes that must match a character */
+
+ case OP_PROP:
+ case OP_NOTPROP:
+ case OP_EXTUNI:
+ case OP_NOT_DIGIT:
+ case OP_DIGIT:
+ case OP_NOT_WHITESPACE:
+ case OP_WHITESPACE:
+ case OP_NOT_WORDCHAR:
+ case OP_WORDCHAR:
+ case OP_ANY:
+ case OP_ANYBYTE:
+ case OP_CHAR:
+ case OP_CHARNC:
+ case OP_NOT:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_POSPLUS:
+ case OP_EXACT:
+ case OP_NOTPLUS:
+ case OP_NOTMINPLUS:
+ case OP_NOTPOSPLUS:
+ case OP_NOTEXACT:
+ case OP_TYPEPLUS:
+ case OP_TYPEMINPLUS:
+ case OP_TYPEPOSPLUS:
+ case OP_TYPEEXACT:
+ return FALSE;
+
+ /* These are going to continue, as they may be empty, but we have to
+ fudge the length for the \p and \P cases. */
+
+ case OP_TYPESTAR:
+ case OP_TYPEMINSTAR:
+ case OP_TYPEPOSSTAR:
+ case OP_TYPEQUERY:
+ case OP_TYPEMINQUERY:
+ case OP_TYPEPOSQUERY:
+ if (code[1] == OP_PROP || code[1] == OP_NOTPROP) code += 2;
+ break;
+
+ /* Same for these */
+
+ case OP_TYPEUPTO:
+ case OP_TYPEMINUPTO:
+ case OP_TYPEPOSUPTO:
+ if (code[3] == OP_PROP || code[3] == OP_NOTPROP) code += 2;
+ break;
+
+ /* End of branch */
+
+ case OP_KET:
+ case OP_KETRMAX:
+ case OP_KETRMIN:
+ case OP_ALT:
+ return TRUE;
+
+ /* In UTF-8 mode, STAR, MINSTAR, POSSTAR, QUERY, MINQUERY, POSQUERY, UPTO,
+ MINUPTO, and POSUPTO may be followed by a multibyte character */
+
+#ifdef SUPPORT_UTF8
+ case OP_STAR:
+ case OP_MINSTAR:
+ case OP_POSSTAR:
+ case OP_QUERY:
+ case OP_MINQUERY:
+ case OP_POSQUERY:
+ case OP_UPTO:
+ case OP_MINUPTO:
+ case OP_POSUPTO:
+ if (utf8) while ((code[2] & 0xc0) == 0x80) code++;
+ break;
+#endif
+ }
+ }
+
+return TRUE;
+}
+
+
+
+/*************************************************
+* Scan compiled regex for non-emptiness *
+*************************************************/
+
+/* This function is called to check for left recursive calls. We want to check
+the current branch of the current pattern to see if it could match the empty
+string. If it could, we must look outwards for branches at other levels,
+stopping when we pass beyond the bracket which is the subject of the recursion.
+
+Arguments:
+ code points to start of the recursion
+ endcode points to where to stop (current RECURSE item)
+ bcptr points to the chain of current (unclosed) branch starts
+ utf8 TRUE if in UTF-8 mode
+
+Returns: TRUE if what is matched could be empty
+*/
+
+static BOOL
+could_be_empty(const uschar *code, const uschar *endcode, branch_chain *bcptr,
+ BOOL utf8)
+{
+while (bcptr != NULL && bcptr->current >= code)
+ {
+ if (!could_be_empty_branch(bcptr->current, endcode, utf8)) return FALSE;
+ bcptr = bcptr->outer;
+ }
+return TRUE;
+}
+
+
+
+/*************************************************
+* Check for POSIX class syntax *
+*************************************************/
+
+/* This function is called when the sequence "[:" or "[." or "[=" is
+encountered in a character class. It checks whether this is followed by a
+sequence of characters terminated by a matching ":]" or ".]" or "=]". If we
+reach an unescaped ']' without the special preceding character, return FALSE.
+
+Originally, this function only recognized a sequence of letters between the
+terminators, but it seems that Perl recognizes any sequence of characters,
+though of course unknown POSIX names are subsequently rejected. Perl gives an
+"Unknown POSIX class" error for [:f\oo:] for example, where previously PCRE
+didn't consider this to be a POSIX class. Likewise for [:1234:].
+
+The problem in trying to be exactly like Perl is in the handling of escapes. We
+have to be sure that [abc[:x\]pqr] is *not* treated as containing a POSIX
+class, but [abc[:x\]pqr:]] is (so that an error can be generated). The code
+below handles the special case of \], but does not try to do any other escape
+processing. This makes it different from Perl for cases such as [:l\ower:]
+where Perl recognizes it as the POSIX class "lower" but PCRE does not recognize
+"l\ower". This is a lesser evil that not diagnosing bad classes when Perl does,
+I think.
+
+Arguments:
+ ptr pointer to the initial [
+ endptr where to return the end pointer
+
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+check_posix_syntax(const uschar *ptr, const uschar **endptr)
+{
+int terminator; /* Don't combine these lines; the Solaris cc */
+terminator = *(++ptr); /* compiler warns about "non-constant" initializer. */
+for (++ptr; *ptr != 0; ptr++)
+ {
+ if (*ptr == '\\' && ptr[1] == ']') ptr++; else
+ {
+ if (*ptr == ']') return FALSE;
+ if (*ptr == terminator && ptr[1] == ']')
+ {
+ *endptr = ptr;
+ return TRUE;
+ }
+ }
+ }
+return FALSE;
+}
+
+
+
+
+/*************************************************
+* Check POSIX class name *
+*************************************************/
+
+/* This function is called to check the name given in a POSIX-style class entry
+such as [:alnum:].
+
+Arguments:
+ ptr points to the first letter
+ len the length of the name
+
+Returns: a value representing the name, or -1 if unknown
+*/
+
+static int
+check_posix_name(const uschar *ptr, int len)
+{
+const char *pn = posix_names;
+register int yield = 0;
+while (posix_name_lengths[yield] != 0)
+ {
+ if (len == posix_name_lengths[yield] &&
+ strncmp((const char *)ptr, pn, len) == 0) return yield;
+ pn += posix_name_lengths[yield] + 1;
+ yield++;
+ }
+return -1;
+}
+
+
+/*************************************************
+* Adjust OP_RECURSE items in repeated group *
+*************************************************/
+
+/* OP_RECURSE items contain an offset from the start of the regex to the group
+that is referenced. This means that groups can be replicated for fixed
+repetition simply by copying (because the recursion is allowed to refer to
+earlier groups that are outside the current group). However, when a group is
+optional (i.e. the minimum quantifier is zero), OP_BRAZERO is inserted before
+it, after it has been compiled. This means that any OP_RECURSE items within it
+that refer to the group itself or any contained groups have to have their
+offsets adjusted. That one of the jobs of this function. Before it is called,
+the partially compiled regex must be temporarily terminated with OP_END.
+
+This function has been extended with the possibility of forward references for
+recursions and subroutine calls. It must also check the list of such references
+for the group we are dealing with. If it finds that one of the recursions in
+the current group is on this list, it adjusts the offset in the list, not the
+value in the reference (which is a group number).
+
+Arguments:
+ group points to the start of the group
+ adjust the amount by which the group is to be moved
+ utf8 TRUE in UTF-8 mode
+ cd contains pointers to tables etc.
+ save_hwm the hwm forward reference pointer at the start of the group
+
+Returns: nothing
+*/
+
+static void
+adjust_recurse(uschar *group, int adjust, BOOL utf8, compile_data *cd,
+ uschar *save_hwm)
+{
+uschar *ptr = group;
+
+while ((ptr = (uschar *)find_recurse(ptr, utf8)) != NULL)
+ {
+ int offset;
+ uschar *hc;
+
+ /* See if this recursion is on the forward reference list. If so, adjust the
+ reference. */
+
+ for (hc = save_hwm; hc < cd->hwm; hc += LINK_SIZE)
+ {
+ offset = GET(hc, 0);
+ if (cd->start_code + offset == ptr + 1)
+ {
+ PUT(hc, 0, offset + adjust);
+ break;
+ }
+ }
+
+ /* Otherwise, adjust the recursion offset if it's after the start of this
+ group. */
+
+ if (hc >= cd->hwm)
+ {
+ offset = GET(ptr, 1);
+ if (cd->start_code + offset >= group) PUT(ptr, 1, offset + adjust);
+ }
+
+ ptr += 1 + LINK_SIZE;
+ }
+}
+
+
+
+/*************************************************
+* Insert an automatic callout point *
+*************************************************/
+
+/* This function is called when the PCRE_AUTO_CALLOUT option is set, to insert
+callout points before each pattern item.
+
+Arguments:
+ code current code pointer
+ ptr current pattern pointer
+ cd pointers to tables etc
+
+Returns: new code pointer
+*/
+
+static uschar *
+auto_callout(uschar *code, const uschar *ptr, compile_data *cd)
+{
+*code++ = OP_CALLOUT;
+*code++ = 255;
+PUT(code, 0, ptr - cd->start_pattern); /* Pattern offset */
+PUT(code, LINK_SIZE, 0); /* Default length */
+return code + 2*LINK_SIZE;
+}
+
+
+
+/*************************************************
+* Complete a callout item *
+*************************************************/
+
+/* A callout item contains the length of the next item in the pattern, which
+we can't fill in till after we have reached the relevant point. This is used
+for both automatic and manual callouts.
+
+Arguments:
+ previous_callout points to previous callout item
+ ptr current pattern pointer
+ cd pointers to tables etc
+
+Returns: nothing
+*/
+
+static void
+complete_callout(uschar *previous_callout, const uschar *ptr, compile_data *cd)
+{
+int length = ptr - cd->start_pattern - GET(previous_callout, 2);
+PUT(previous_callout, 2 + LINK_SIZE, length);
+}
+
+
+
+#ifdef SUPPORT_UCP
+/*************************************************
+* Get othercase range *
+*************************************************/
+
+/* This function is passed the start and end of a class range, in UTF-8 mode
+with UCP support. It searches up the characters, looking for internal ranges of
+characters in the "other" case. Each call returns the next one, updating the
+start address.
+
+Arguments:
+ cptr points to starting character value; updated
+ d end value
+ ocptr where to put start of othercase range
+ odptr where to put end of othercase range
+
+Yield: TRUE when range returned; FALSE when no more
+*/
+
+static BOOL
+get_othercase_range(unsigned int *cptr, unsigned int d, unsigned int *ocptr,
+ unsigned int *odptr)
+{
+unsigned int c, othercase, next;
+
+for (c = *cptr; c <= d; c++)
+ { if ((othercase = _erts_pcre_ucp_othercase(c)) != NOTACHAR) break; }
+
+if (c > d) return FALSE;
+
+*ocptr = othercase;
+next = othercase + 1;
+
+for (++c; c <= d; c++)
+ {
+ if (_erts_pcre_ucp_othercase(c) != next) break;
+ next++;
+ }
+
+*odptr = next - 1;
+*cptr = c;
+
+return TRUE;
+}
+#endif /* SUPPORT_UCP */
+
+
+
+/*************************************************
+* Check if auto-possessifying is possible *
+*************************************************/
+
+/* This function is called for unlimited repeats of certain items, to see
+whether the next thing could possibly match the repeated item. If not, it makes
+sense to automatically possessify the repeated item.
+
+Arguments:
+ op_code the repeated op code
+ this data for this item, depends on the opcode
+ utf8 TRUE in UTF-8 mode
+ utf8_char used for utf8 character bytes, NULL if not relevant
+ ptr next character in pattern
+ options options bits
+ cd contains pointers to tables etc.
+
+Returns: TRUE if possessifying is wanted
+*/
+
+static BOOL
+check_auto_possessive(int op_code, int item, BOOL utf8, uschar *utf8_char,
+ const uschar *ptr, int options, compile_data *cd)
+{
+int next;
+
+/* Skip whitespace and comments in extended mode */
+
+if ((options & PCRE_EXTENDED) != 0)
+ {
+ for (;;)
+ {
+ while ((cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
+ if (*ptr == '#')
+ {
+ while (*(++ptr) != 0)
+ if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
+ }
+ else break;
+ }
+ }
+
+/* If the next item is one that we can handle, get its value. A non-negative
+value is a character, a negative value is an escape value. */
+
+if (*ptr == '\\')
+ {
+ int temperrorcode = 0;
+ next = check_escape(&ptr, &temperrorcode, cd->bracount, options, FALSE);
+ if (temperrorcode != 0) return FALSE;
+ ptr++; /* Point after the escape sequence */
+ }
+
+else if ((cd->ctypes[*ptr] & ctype_meta) == 0)
+ {
+#ifdef SUPPORT_UTF8
+ if (utf8) { GETCHARINC(next, ptr); } else
+#endif
+ next = *ptr++;
+ }
+
+else return FALSE;
+
+/* Skip whitespace and comments in extended mode */
+
+if ((options & PCRE_EXTENDED) != 0)
+ {
+ for (;;)
+ {
+ while ((cd->ctypes[*ptr] & ctype_space) != 0) ptr++;
+ if (*ptr == '#')
+ {
+ while (*(++ptr) != 0)
+ if (IS_NEWLINE(ptr)) { ptr += cd->nllen; break; }
+ }
+ else break;
+ }
+ }
+
+/* If the next thing is itself optional, we have to give up. */
+
+if (*ptr == '*' || *ptr == '?' || strncmp((char *)ptr, "{0,", 3) == 0)
+ return FALSE;
+
+/* Now compare the next item with the previous opcode. If the previous is a
+positive single character match, "item" either contains the character or, if
+"item" is greater than 127 in utf8 mode, the character's bytes are in
+utf8_char. */
+
+
+/* Handle cases when the next item is a character. */
+
+if (next >= 0) switch(op_code)
+ {
+ case OP_CHAR:
+#ifdef SUPPORT_UTF8
+ if (utf8 && item > 127) { GETCHAR(item, utf8_char); }
+#endif
+ return item != next;
+
+ /* For CHARNC (caseless character) we must check the other case. If we have
+ Unicode property support, we can use it to test the other case of
+ high-valued characters. */
+
+ case OP_CHARNC:
+#ifdef SUPPORT_UTF8
+ if (utf8 && item > 127) { GETCHAR(item, utf8_char); }
+#endif
+ if (item == next) return FALSE;
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ {
+ unsigned int othercase;
+ if (next < 128) othercase = cd->fcc[next]; else
+#ifdef SUPPORT_UCP
+ othercase = _erts_pcre_ucp_othercase((unsigned int)next);
+#else
+ othercase = NOTACHAR;
+#endif
+ return (unsigned int)item != othercase;
+ }
+ else
+#endif /* SUPPORT_UTF8 */
+ return (item != cd->fcc[next]); /* Non-UTF-8 mode */
+
+ /* For OP_NOT, "item" must be a single-byte character. */
+
+ case OP_NOT:
+ if (next < 0) return FALSE; /* Not a character */
+ if (item == next) return TRUE;
+ if ((options & PCRE_CASELESS) == 0) return FALSE;
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ {
+ unsigned int othercase;
+ if (next < 128) othercase = cd->fcc[next]; else
+#ifdef SUPPORT_UCP
+ othercase = _erts_pcre_ucp_othercase(next);
+#else
+ othercase = NOTACHAR;
+#endif
+ return (unsigned int)item == othercase;
+ }
+ else
+#endif /* SUPPORT_UTF8 */
+ return (item == cd->fcc[next]); /* Non-UTF-8 mode */
+
+ case OP_DIGIT:
+ return next > 127 || (cd->ctypes[next] & ctype_digit) == 0;
+
+ case OP_NOT_DIGIT:
+ return next <= 127 && (cd->ctypes[next] & ctype_digit) != 0;
+
+ case OP_WHITESPACE:
+ return next > 127 || (cd->ctypes[next] & ctype_space) == 0;
+
+ case OP_NOT_WHITESPACE:
+ return next <= 127 && (cd->ctypes[next] & ctype_space) != 0;
+
+ case OP_WORDCHAR:
+ return next > 127 || (cd->ctypes[next] & ctype_word) == 0;
+
+ case OP_NOT_WORDCHAR:
+ return next <= 127 && (cd->ctypes[next] & ctype_word) != 0;
+
+ case OP_HSPACE:
+ case OP_NOT_HSPACE:
+ switch(next)
+ {
+ case 0x09:
+ case 0x20:
+ case 0xa0:
+ case 0x1680:
+ case 0x180e:
+ case 0x2000:
+ case 0x2001:
+ case 0x2002:
+ case 0x2003:
+ case 0x2004:
+ case 0x2005:
+ case 0x2006:
+ case 0x2007:
+ case 0x2008:
+ case 0x2009:
+ case 0x200A:
+ case 0x202f:
+ case 0x205f:
+ case 0x3000:
+ return op_code != OP_HSPACE;
+ default:
+ return op_code == OP_HSPACE;
+ }
+
+ case OP_VSPACE:
+ case OP_NOT_VSPACE:
+ switch(next)
+ {
+ case 0x0a:
+ case 0x0b:
+ case 0x0c:
+ case 0x0d:
+ case 0x85:
+ case 0x2028:
+ case 0x2029:
+ return op_code != OP_VSPACE;
+ default:
+ return op_code == OP_VSPACE;
+ }
+
+ default:
+ return FALSE;
+ }
+
+
+/* Handle the case when the next item is \d, \s, etc. */
+
+switch(op_code)
+ {
+ case OP_CHAR:
+ case OP_CHARNC:
+#ifdef SUPPORT_UTF8
+ if (utf8 && item > 127) { GETCHAR(item, utf8_char); }
+#endif
+ switch(-next)
+ {
+ case ESC_d:
+ return item > 127 || (cd->ctypes[item] & ctype_digit) == 0;
+
+ case ESC_D:
+ return item <= 127 && (cd->ctypes[item] & ctype_digit) != 0;
+
+ case ESC_s:
+ return item > 127 || (cd->ctypes[item] & ctype_space) == 0;
+
+ case ESC_S:
+ return item <= 127 && (cd->ctypes[item] & ctype_space) != 0;
+
+ case ESC_w:
+ return item > 127 || (cd->ctypes[item] & ctype_word) == 0;
+
+ case ESC_W:
+ return item <= 127 && (cd->ctypes[item] & ctype_word) != 0;
+
+ case ESC_h:
+ case ESC_H:
+ switch(item)
+ {
+ case 0x09:
+ case 0x20:
+ case 0xa0:
+ case 0x1680:
+ case 0x180e:
+ case 0x2000:
+ case 0x2001:
+ case 0x2002:
+ case 0x2003:
+ case 0x2004:
+ case 0x2005:
+ case 0x2006:
+ case 0x2007:
+ case 0x2008:
+ case 0x2009:
+ case 0x200A:
+ case 0x202f:
+ case 0x205f:
+ case 0x3000:
+ return -next != ESC_h;
+ default:
+ return -next == ESC_h;
+ }
+
+ case ESC_v:
+ case ESC_V:
+ switch(item)
+ {
+ case 0x0a:
+ case 0x0b:
+ case 0x0c:
+ case 0x0d:
+ case 0x85:
+ case 0x2028:
+ case 0x2029:
+ return -next != ESC_v;
+ default:
+ return -next == ESC_v;
+ }
+
+ default:
+ return FALSE;
+ }
+
+ case OP_DIGIT:
+ return next == -ESC_D || next == -ESC_s || next == -ESC_W ||
+ next == -ESC_h || next == -ESC_v;
+
+ case OP_NOT_DIGIT:
+ return next == -ESC_d;
+
+ case OP_WHITESPACE:
+ return next == -ESC_S || next == -ESC_d || next == -ESC_w;
+
+ case OP_NOT_WHITESPACE:
+ return next == -ESC_s || next == -ESC_h || next == -ESC_v;
+
+ case OP_HSPACE:
+ return next == -ESC_S || next == -ESC_H || next == -ESC_d || next == -ESC_w;
+
+ case OP_NOT_HSPACE:
+ return next == -ESC_h;
+
+ /* Can't have \S in here because VT matches \S (Perl anomaly) */
+ case OP_VSPACE:
+ return next == -ESC_V || next == -ESC_d || next == -ESC_w;
+
+ case OP_NOT_VSPACE:
+ return next == -ESC_v;
+
+ case OP_WORDCHAR:
+ return next == -ESC_W || next == -ESC_s || next == -ESC_h || next == -ESC_v;
+
+ case OP_NOT_WORDCHAR:
+ return next == -ESC_w || next == -ESC_d;
+
+ default:
+ return FALSE;
+ }
+
+/* Control does not reach here */
+}
+
+
+
+/*************************************************
+* Compile one branch *
+*************************************************/
+
+/* Scan the pattern, compiling it into the a vector. If the options are
+changed during the branch, the pointer is used to change the external options
+bits. This function is used during the pre-compile phase when we are trying
+to find out the amount of memory needed, as well as during the real compile
+phase. The value of lengthptr distinguishes the two phases.
+
+Arguments:
+ optionsptr pointer to the option bits
+ codeptr points to the pointer to the current code point
+ ptrptr points to the current pattern pointer
+ errorcodeptr points to error code variable
+ firstbyteptr set to initial literal character, or < 0 (REQ_UNSET, REQ_NONE)
+ reqbyteptr set to the last literal character required, else < 0
+ bcptr points to current branch chain
+ cd contains pointers to tables etc.
+ lengthptr NULL during the real compile phase
+ points to length accumulator during pre-compile phase
+
+Returns: TRUE on success
+ FALSE, with *errorcodeptr set non-zero on error
+*/
+
+static BOOL
+compile_branch(int *optionsptr, uschar **codeptr, const uschar **ptrptr,
+ int *errorcodeptr, int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr,
+ compile_data *cd, int *lengthptr)
+{
+int repeat_type, op_type;
+int repeat_min = 0, repeat_max = 0; /* To please picky compilers */
+int bravalue = 0;
+int greedy_default, greedy_non_default;
+int firstbyte, reqbyte;
+int zeroreqbyte, zerofirstbyte;
+int req_caseopt, reqvary, tempreqvary;
+int options = *optionsptr;
+int after_manual_callout = 0;
+int length_prevgroup = 0;
+register int c;
+register uschar *code = *codeptr;
+uschar *last_code = code;
+uschar *orig_code = code;
+uschar *tempcode;
+BOOL inescq = FALSE;
+BOOL groupsetfirstbyte = FALSE;
+const uschar *ptr = *ptrptr;
+const uschar *tempptr;
+uschar *previous = NULL;
+uschar *previous_callout = NULL;
+uschar *save_hwm = NULL;
+uschar classbits[32];
+
+#ifdef SUPPORT_UTF8
+BOOL class_utf8;
+BOOL utf8 = (options & PCRE_UTF8) != 0;
+uschar *class_utf8data;
+uschar *class_utf8data_base;
+uschar utf8_char[6];
+#else
+BOOL utf8 = FALSE;
+uschar *utf8_char = NULL;
+#endif
+
+#ifdef DEBUG
+if (lengthptr != NULL) DPRINTF((">> start branch\n"));
+#endif
+
+/* Set up the default and non-default settings for greediness */
+
+greedy_default = ((options & PCRE_UNGREEDY) != 0);
+greedy_non_default = greedy_default ^ 1;
+
+/* Initialize no first byte, no required byte. REQ_UNSET means "no char
+matching encountered yet". It gets changed to REQ_NONE if we hit something that
+matches a non-fixed char first char; reqbyte just remains unset if we never
+find one.
+
+When we hit a repeat whose minimum is zero, we may have to adjust these values
+to take the zero repeat into account. This is implemented by setting them to
+zerofirstbyte and zeroreqbyte when such a repeat is encountered. The individual
+item types that can be repeated set these backoff variables appropriately. */
+
+firstbyte = reqbyte = zerofirstbyte = zeroreqbyte = REQ_UNSET;
+
+/* The variable req_caseopt contains either the REQ_CASELESS value or zero,
+according to the current setting of the caseless flag. REQ_CASELESS is a bit
+value > 255. It is added into the firstbyte or reqbyte variables to record the
+case status of the value. This is used only for ASCII characters. */
+
+req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0;
+
+/* Switch on next character until the end of the branch */
+
+for (;; ptr++)
+ {
+ BOOL negate_class;
+ BOOL should_flip_negation;
+ BOOL possessive_quantifier;
+ BOOL is_quantifier;
+ BOOL is_recurse;
+ BOOL reset_bracount;
+ int class_charcount;
+ int class_lastchar;
+ int newoptions;
+ int recno;
+ int refsign;
+ int skipbytes;
+ int subreqbyte;
+ int subfirstbyte;
+ int terminator;
+ int mclength;
+ uschar mcbuffer[8];
+
+ /* Get next byte in the pattern */
+
+ c = *ptr;
+
+ /* If we are in the pre-compile phase, accumulate the length used for the
+ previous cycle of this loop. */
+
+ if (lengthptr != NULL)
+ {
+#ifdef DEBUG
+ if (code > cd->hwm) cd->hwm = code; /* High water info */
+#endif
+ if (code > cd->start_workspace + COMPILE_WORK_SIZE) /* Check for overrun */
+ {
+ *errorcodeptr = ERR52;
+ goto FAILED;
+ }
+
+ /* There is at least one situation where code goes backwards: this is the
+ case of a zero quantifier after a class (e.g. [ab]{0}). At compile time,
+ the class is simply eliminated. However, it is created first, so we have to
+ allow memory for it. Therefore, don't ever reduce the length at this point.
+ */
+
+ if (code < last_code) code = last_code;
+
+ /* Paranoid check for integer overflow */
+
+ if (OFLOW_MAX - *lengthptr < code - last_code)
+ {
+ *errorcodeptr = ERR20;
+ goto FAILED;
+ }
+
+ *lengthptr += code - last_code;
+ DPRINTF(("length=%d added %d c=%c\n", *lengthptr, code - last_code, c));
+
+ /* If "previous" is set and it is not at the start of the work space, move
+ it back to there, in order to avoid filling up the work space. Otherwise,
+ if "previous" is NULL, reset the current code pointer to the start. */
+
+ if (previous != NULL)
+ {
+ if (previous > orig_code)
+ {
+ memmove(orig_code, previous, code - previous);
+ code -= previous - orig_code;
+ previous = orig_code;
+ }
+ }
+ else code = orig_code;
+
+ /* Remember where this code item starts so we can pick up the length
+ next time round. */
+
+ last_code = code;
+ }
+
+ /* In the real compile phase, just check the workspace used by the forward
+ reference list. */
+
+ else if (cd->hwm > cd->start_workspace + COMPILE_WORK_SIZE)
+ {
+ *errorcodeptr = ERR52;
+ goto FAILED;
+ }
+
+ /* If in \Q...\E, check for the end; if not, we have a literal */
+
+ if (inescq && c != 0)
+ {
+ if (c == '\\' && ptr[1] == 'E')
+ {
+ inescq = FALSE;
+ ptr++;
+ continue;
+ }
+ else
+ {
+ if (previous_callout != NULL)
+ {
+ if (lengthptr == NULL) /* Don't attempt in pre-compile phase */
+ complete_callout(previous_callout, ptr, cd);
+ previous_callout = NULL;
+ }
+ if ((options & PCRE_AUTO_CALLOUT) != 0)
+ {
+ previous_callout = code;
+ code = auto_callout(code, ptr, cd);
+ }
+ goto NORMAL_CHAR;
+ }
+ }
+
+ /* Fill in length of a previous callout, except when the next thing is
+ a quantifier. */
+
+ is_quantifier = c == '*' || c == '+' || c == '?' ||
+ (c == '{' && is_counted_repeat(ptr+1));
+
+ if (!is_quantifier && previous_callout != NULL &&
+ after_manual_callout-- <= 0)
+ {
+ if (lengthptr == NULL) /* Don't attempt in pre-compile phase */
+ complete_callout(previous_callout, ptr, cd);
+ previous_callout = NULL;
+ }
+
+ /* In extended mode, skip white space and comments */
+
+ if ((options & PCRE_EXTENDED) != 0)
+ {
+ if ((cd->ctypes[c] & ctype_space) != 0) continue;
+ if (c == '#')
+ {
+ while (*(++ptr) != 0)
+ {
+ if (IS_NEWLINE(ptr)) { ptr += cd->nllen - 1; break; }
+ }
+ if (*ptr != 0) continue;
+
+ /* Else fall through to handle end of string */
+ c = 0;
+ }
+ }
+
+ /* No auto callout for quantifiers. */
+
+ if ((options & PCRE_AUTO_CALLOUT) != 0 && !is_quantifier)
+ {
+ previous_callout = code;
+ code = auto_callout(code, ptr, cd);
+ }
+
+ switch(c)
+ {
+ /* ===================================================================*/
+ case 0: /* The branch terminates at string end */
+ case '|': /* or | or ) */
+ case ')':
+ *firstbyteptr = firstbyte;
+ *reqbyteptr = reqbyte;
+ *codeptr = code;
+ *ptrptr = ptr;
+ if (lengthptr != NULL)
+ {
+ if (OFLOW_MAX - *lengthptr < code - last_code)
+ {
+ *errorcodeptr = ERR20;
+ goto FAILED;
+ }
+ *lengthptr += code - last_code; /* To include callout length */
+ DPRINTF((">> end branch\n"));
+ }
+ return TRUE;
+
+
+ /* ===================================================================*/
+ /* Handle single-character metacharacters. In multiline mode, ^ disables
+ the setting of any following char as a first character. */
+
+ case '^':
+ if ((options & PCRE_MULTILINE) != 0)
+ {
+ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
+ }
+ previous = NULL;
+ *code++ = OP_CIRC;
+ break;
+
+ case '$':
+ previous = NULL;
+ *code++ = OP_DOLL;
+ break;
+
+ /* There can never be a first char if '.' is first, whatever happens about
+ repeats. The value of reqbyte doesn't change either. */
+
+ case '.':
+ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
+ zerofirstbyte = firstbyte;
+ zeroreqbyte = reqbyte;
+ previous = code;
+ *code++ = OP_ANY;
+ break;
+
+
+ /* ===================================================================*/
+ /* Character classes. If the included characters are all < 256, we build a
+ 32-byte bitmap of the permitted characters, except in the special case
+ where there is only one such character. For negated classes, we build the
+ map as usual, then invert it at the end. However, we use a different opcode
+ so that data characters > 255 can be handled correctly.
+
+ If the class contains characters outside the 0-255 range, a different
+ opcode is compiled. It may optionally have a bit map for characters < 256,
+ but those above are are explicitly listed afterwards. A flag byte tells
+ whether the bitmap is present, and whether this is a negated class or not.
+ */
+
+ case '[':
+ previous = code;
+
+ /* PCRE supports POSIX class stuff inside a class. Perl gives an error if
+ they are encountered at the top level, so we'll do that too. */
+
+ if ((ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') &&
+ check_posix_syntax(ptr, &tempptr))
+ {
+ *errorcodeptr = (ptr[1] == ':')? ERR13 : ERR31;
+ goto FAILED;
+ }
+
+ /* If the first character is '^', set the negation flag and skip it. Also,
+ if the first few characters (either before or after ^) are \Q\E or \E we
+ skip them too. This makes for compatibility with Perl. */
+
+ negate_class = FALSE;
+ for (;;)
+ {
+ c = *(++ptr);
+ if (c == '\\')
+ {
+ if (ptr[1] == 'E') ptr++;
+ else if (strncmp((const char *)ptr+1, "Q\\E", 3) == 0) ptr += 3;
+ else break;
+ }
+ else if (!negate_class && c == '^')
+ negate_class = TRUE;
+ else break;
+ }
+
+ /* If a class contains a negative special such as \S, we need to flip the
+ negation flag at the end, so that support for characters > 255 works
+ correctly (they are all included in the class). */
+
+ should_flip_negation = FALSE;
+
+ /* Keep a count of chars with values < 256 so that we can optimize the case
+ of just a single character (as long as it's < 256). However, For higher
+ valued UTF-8 characters, we don't yet do any optimization. */
+
+ class_charcount = 0;
+ class_lastchar = -1;
+
+ /* Initialize the 32-char bit map to all zeros. We build the map in a
+ temporary bit of memory, in case the class contains only 1 character (less
+ than 256), because in that case the compiled code doesn't use the bit map.
+ */
+
+ memset(classbits, 0, 32 * sizeof(uschar));
+
+#ifdef SUPPORT_UTF8
+ class_utf8 = FALSE; /* No chars >= 256 */
+ class_utf8data = code + LINK_SIZE + 2; /* For UTF-8 items */
+ class_utf8data_base = class_utf8data; /* For resetting in pass 1 */
+#endif
+
+ /* Process characters until ] is reached. By writing this as a "do" it
+ means that an initial ] is taken as a data character. At the start of the
+ loop, c contains the first byte of the character. */
+
+ if (c != 0) do
+ {
+ const uschar *oldptr;
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && c > 127)
+ { /* Braces are required because the */
+ GETCHARLEN(c, ptr, ptr); /* macro generates multiple statements */
+ }
+
+ /* In the pre-compile phase, accumulate the length of any UTF-8 extra
+ data and reset the pointer. This is so that very large classes that
+ contain a zillion UTF-8 characters no longer overwrite the work space
+ (which is on the stack). */
+
+ if (lengthptr != NULL)
+ {
+ *lengthptr += class_utf8data - class_utf8data_base;
+ class_utf8data = class_utf8data_base;
+ }
+
+#endif
+
+ /* Inside \Q...\E everything is literal except \E */
+
+ if (inescq)
+ {
+ if (c == '\\' && ptr[1] == 'E') /* If we are at \E */
+ {
+ inescq = FALSE; /* Reset literal state */
+ ptr++; /* Skip the 'E' */
+ continue; /* Carry on with next */
+ }
+ goto CHECK_RANGE; /* Could be range if \E follows */
+ }
+
+ /* Handle POSIX class names. Perl allows a negation extension of the
+ form [:^name:]. A square bracket that doesn't match the syntax is
+ treated as a literal. We also recognize the POSIX constructions
+ [.ch.] and [=ch=] ("collating elements") and fault them, as Perl
+ 5.6 and 5.8 do. */
+
+ if (c == '[' &&
+ (ptr[1] == ':' || ptr[1] == '.' || ptr[1] == '=') &&
+ check_posix_syntax(ptr, &tempptr))
+ {
+ BOOL local_negate = FALSE;
+ int posix_class, taboffset, tabopt;
+ register const uschar *cbits = cd->cbits;
+ uschar pbits[32];
+
+ if (ptr[1] != ':')
+ {
+ *errorcodeptr = ERR31;
+ goto FAILED;
+ }
+
+ ptr += 2;
+ if (*ptr == '^')
+ {
+ local_negate = TRUE;
+ should_flip_negation = TRUE; /* Note negative special */
+ ptr++;
+ }
+
+ posix_class = check_posix_name(ptr, tempptr - ptr);
+ if (posix_class < 0)
+ {
+ *errorcodeptr = ERR30;
+ goto FAILED;
+ }
+
+ /* If matching is caseless, upper and lower are converted to
+ alpha. This relies on the fact that the class table starts with
+ alpha, lower, upper as the first 3 entries. */
+
+ if ((options & PCRE_CASELESS) != 0 && posix_class <= 2)
+ posix_class = 0;
+
+ /* We build the bit map for the POSIX class in a chunk of local store
+ because we may be adding and subtracting from it, and we don't want to
+ subtract bits that may be in the main map already. At the end we or the
+ result into the bit map that is being built. */
+
+ posix_class *= 3;
+
+ /* Copy in the first table (always present) */
+
+ memcpy(pbits, cbits + posix_class_maps[posix_class],
+ 32 * sizeof(uschar));
+
+ /* If there is a second table, add or remove it as required. */
+
+ taboffset = posix_class_maps[posix_class + 1];
+ tabopt = posix_class_maps[posix_class + 2];
+
+ if (taboffset >= 0)
+ {
+ if (tabopt >= 0)
+ for (c = 0; c < 32; c++) pbits[c] |= cbits[c + taboffset];
+ else
+ for (c = 0; c < 32; c++) pbits[c] &= ~cbits[c + taboffset];
+ }
+
+ /* Not see if we need to remove any special characters. An option
+ value of 1 removes vertical space and 2 removes underscore. */
+
+ if (tabopt < 0) tabopt = -tabopt;
+ if (tabopt == 1) pbits[1] &= ~0x3c;
+ else if (tabopt == 2) pbits[11] &= 0x7f;
+
+ /* Add the POSIX table or its complement into the main table that is
+ being built and we are done. */
+
+ if (local_negate)
+ for (c = 0; c < 32; c++) classbits[c] |= ~pbits[c];
+ else
+ for (c = 0; c < 32; c++) classbits[c] |= pbits[c];
+
+ ptr = tempptr + 1;
+ class_charcount = 10; /* Set > 1; assumes more than 1 per class */
+ continue; /* End of POSIX syntax handling */
+ }
+
+ /* Backslash may introduce a single character, or it may introduce one
+ of the specials, which just set a flag. The sequence \b is a special
+ case. Inside a class (and only there) it is treated as backspace.
+ Elsewhere it marks a word boundary. Other escapes have preset maps ready
+ to 'or' into the one we are building. We assume they have more than one
+ character in them, so set class_charcount bigger than one. */
+
+ if (c == '\\')
+ {
+ c = check_escape(&ptr, errorcodeptr, cd->bracount, options, TRUE);
+ if (*errorcodeptr != 0) goto FAILED;
+
+ if (-c == ESC_b) c = '\b'; /* \b is backspace in a class */
+ else if (-c == ESC_X) c = 'X'; /* \X is literal X in a class */
+ else if (-c == ESC_R) c = 'R'; /* \R is literal R in a class */
+ else if (-c == ESC_Q) /* Handle start of quoted string */
+ {
+ if (ptr[1] == '\\' && ptr[2] == 'E')
+ {
+ ptr += 2; /* avoid empty string */
+ }
+ else inescq = TRUE;
+ continue;
+ }
+ else if (-c == ESC_E) continue; /* Ignore orphan \E */
+
+ if (c < 0)
+ {
+ register const uschar *cbits = cd->cbits;
+ class_charcount += 2; /* Greater than 1 is what matters */
+
+ /* Save time by not doing this in the pre-compile phase. */
+
+ if (lengthptr == NULL) switch (-c)
+ {
+ case ESC_d:
+ for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_digit];
+ continue;
+
+ case ESC_D:
+ should_flip_negation = TRUE;
+ for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_digit];
+ continue;
+
+ case ESC_w:
+ for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_word];
+ continue;
+
+ case ESC_W:
+ should_flip_negation = TRUE;
+ for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_word];
+ continue;
+
+ case ESC_s:
+ for (c = 0; c < 32; c++) classbits[c] |= cbits[c+cbit_space];
+ classbits[1] &= ~0x08; /* Perl 5.004 onwards omits VT from \s */
+ continue;
+
+ case ESC_S:
+ should_flip_negation = TRUE;
+ for (c = 0; c < 32; c++) classbits[c] |= ~cbits[c+cbit_space];
+ classbits[1] |= 0x08; /* Perl 5.004 onwards omits VT from \s */
+ continue;
+
+ default: /* Not recognized; fall through */
+ break; /* Need "default" setting to stop compiler warning. */
+ }
+
+ /* In the pre-compile phase, just do the recognition. */
+
+ else if (c == -ESC_d || c == -ESC_D || c == -ESC_w ||
+ c == -ESC_W || c == -ESC_s || c == -ESC_S) continue;
+
+ /* We need to deal with \H, \h, \V, and \v in both phases because
+ they use extra memory. */
+
+ if (-c == ESC_h)
+ {
+ SETBIT(classbits, 0x09); /* VT */
+ SETBIT(classbits, 0x20); /* SPACE */
+ SETBIT(classbits, 0xa0); /* NSBP */
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ {
+ class_utf8 = TRUE;
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(0x1680, class_utf8data);
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(0x180e, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x2000, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x200A, class_utf8data);
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(0x202f, class_utf8data);
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(0x205f, class_utf8data);
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(0x3000, class_utf8data);
+ }
+#endif
+ continue;
+ }
+
+ if (-c == ESC_H)
+ {
+ for (c = 0; c < 32; c++)
+ {
+ int x = 0xff;
+ switch (c)
+ {
+ case 0x09/8: x ^= 1 << (0x09%8); break;
+ case 0x20/8: x ^= 1 << (0x20%8); break;
+ case 0xa0/8: x ^= 1 << (0xa0%8); break;
+ default: break;
+ }
+ classbits[c] |= x;
+ }
+
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ {
+ class_utf8 = TRUE;
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x0100, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x167f, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x1681, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x180d, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x180f, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x1fff, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x200B, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x202e, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x2030, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x205e, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x2060, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x2fff, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x3001, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x7fffffff, class_utf8data);
+ }
+#endif
+ continue;
+ }
+
+ if (-c == ESC_v)
+ {
+ SETBIT(classbits, 0x0a); /* LF */
+ SETBIT(classbits, 0x0b); /* VT */
+ SETBIT(classbits, 0x0c); /* FF */
+ SETBIT(classbits, 0x0d); /* CR */
+ SETBIT(classbits, 0x85); /* NEL */
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ {
+ class_utf8 = TRUE;
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x2028, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x2029, class_utf8data);
+ }
+#endif
+ continue;
+ }
+
+ if (-c == ESC_V)
+ {
+ for (c = 0; c < 32; c++)
+ {
+ int x = 0xff;
+ switch (c)
+ {
+ case 0x0a/8: x ^= 1 << (0x0a%8);
+ x ^= 1 << (0x0b%8);
+ x ^= 1 << (0x0c%8);
+ x ^= 1 << (0x0d%8);
+ break;
+ case 0x85/8: x ^= 1 << (0x85%8); break;
+ default: break;
+ }
+ classbits[c] |= x;
+ }
+
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ {
+ class_utf8 = TRUE;
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x0100, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x2027, class_utf8data);
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(0x2029, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(0x7fffffff, class_utf8data);
+ }
+#endif
+ continue;
+ }
+
+ /* We need to deal with \P and \p in both phases. */
+
+#ifdef SUPPORT_UCP
+ if (-c == ESC_p || -c == ESC_P)
+ {
+ BOOL negated;
+ int pdata;
+ int ptype = get_ucp(&ptr, &negated, &pdata, errorcodeptr);
+ if (ptype < 0) goto FAILED;
+ class_utf8 = TRUE;
+ *class_utf8data++ = ((-c == ESC_p) != negated)?
+ XCL_PROP : XCL_NOTPROP;
+ *class_utf8data++ = ptype;
+ *class_utf8data++ = pdata;
+ class_charcount -= 2; /* Not a < 256 character */
+ continue;
+ }
+#endif
+ /* Unrecognized escapes are faulted if PCRE is running in its
+ strict mode. By default, for compatibility with Perl, they are
+ treated as literals. */
+
+ if ((options & PCRE_EXTRA) != 0)
+ {
+ *errorcodeptr = ERR7;
+ goto FAILED;
+ }
+
+ class_charcount -= 2; /* Undo the default count from above */
+ c = *ptr; /* Get the final character and fall through */
+ }
+
+ /* Fall through if we have a single character (c >= 0). This may be
+ greater than 256 in UTF-8 mode. */
+
+ } /* End of backslash handling */
+
+ /* 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
+ at the end is treated as a literal. Perl ignores orphaned \E sequences
+ entirely. The code for handling \Q and \E is messy. */
+
+ CHECK_RANGE:
+ while (ptr[1] == '\\' && ptr[2] == 'E')
+ {
+ inescq = FALSE;
+ ptr += 2;
+ }
+
+ oldptr = ptr;
+
+ /* Remember \r or \n */
+
+ if (c == '\r' || c == '\n') cd->external_flags |= PCRE_HASCRORLF;
+
+ /* Check for range */
+
+ if (!inescq && ptr[1] == '-')
+ {
+ int d;
+ ptr += 2;
+ while (*ptr == '\\' && ptr[1] == 'E') ptr += 2;
+
+ /* If we hit \Q (not followed by \E) at this point, go into escaped
+ mode. */
+
+ while (*ptr == '\\' && ptr[1] == 'Q')
+ {
+ ptr += 2;
+ if (*ptr == '\\' && ptr[1] == 'E') { ptr += 2; continue; }
+ inescq = TRUE;
+ break;
+ }
+
+ if (*ptr == 0 || (!inescq && *ptr == ']'))
+ {
+ ptr = oldptr;
+ goto LONE_SINGLE_CHARACTER;
+ }
+
+#ifdef SUPPORT_UTF8
+ if (utf8)
+ { /* Braces are required because the */
+ GETCHARLEN(d, ptr, ptr); /* macro generates multiple statements */
+ }
+ else
+#endif
+ d = *ptr; /* Not UTF-8 mode */
+
+ /* The second part of a range can be a single-character escape, but
+ not any of the other escapes. Perl 5.6 treats a hyphen as a literal
+ in such circumstances. */
+
+ if (!inescq && d == '\\')
+ {
+ d = check_escape(&ptr, errorcodeptr, cd->bracount, options, TRUE);
+ if (*errorcodeptr != 0) goto FAILED;
+
+ /* \b is backspace; \X is literal X; \R is literal R; any other
+ special means the '-' was literal */
+
+ if (d < 0)
+ {
+ if (d == -ESC_b) d = '\b';
+ else if (d == -ESC_X) d = 'X';
+ else if (d == -ESC_R) d = 'R'; else
+ {
+ ptr = oldptr;
+ goto LONE_SINGLE_CHARACTER; /* A few lines below */
+ }
+ }
+ }
+
+ /* Check that the two values are in the correct order. Optimize
+ one-character ranges */
+
+ if (d < c)
+ {
+ *errorcodeptr = ERR8;
+ goto FAILED;
+ }
+
+ if (d == c) goto LONE_SINGLE_CHARACTER; /* A few lines below */
+
+ /* Remember \r or \n */
+
+ if (d == '\r' || d == '\n') cd->external_flags |= PCRE_HASCRORLF;
+
+ /* In UTF-8 mode, if the upper limit is > 255, or > 127 for caseless
+ matching, we have to use an XCLASS with extra data items. Caseless
+ matching for characters > 127 is available only if UCP support is
+ available. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && (d > 255 || ((options & PCRE_CASELESS) != 0 && d > 127)))
+ {
+ class_utf8 = TRUE;
+
+ /* With UCP support, we can find the other case equivalents of
+ the relevant characters. There may be several ranges. Optimize how
+ they fit with the basic range. */
+
+#ifdef SUPPORT_UCP
+ if ((options & PCRE_CASELESS) != 0)
+ {
+ unsigned int occ, ocd;
+ unsigned int cc = c;
+ unsigned int origd = d;
+ while (get_othercase_range(&cc, origd, &occ, &ocd))
+ {
+ if (occ >= (unsigned int)c &&
+ ocd <= (unsigned int)d)
+ continue; /* Skip embedded ranges */
+
+ if (occ < (unsigned int)c &&
+ ocd >= (unsigned int)c - 1) /* Extend the basic range */
+ { /* if there is overlap, */
+ c = occ; /* noting that if occ < c */
+ continue; /* we can't have ocd > d */
+ } /* because a subrange is */
+ if (ocd > (unsigned int)d &&
+ occ <= (unsigned int)d + 1) /* always shorter than */
+ { /* the basic range. */
+ d = ocd;
+ continue;
+ }
+
+ if (occ == ocd)
+ {
+ *class_utf8data++ = XCL_SINGLE;
+ }
+ else
+ {
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(occ, class_utf8data);
+ }
+ class_utf8data += _erts_pcre_ord2utf8(ocd, class_utf8data);
+ }
+ }
+#endif /* SUPPORT_UCP */
+
+ /* Now record the original range, possibly modified for UCP caseless
+ overlapping ranges. */
+
+ *class_utf8data++ = XCL_RANGE;
+ class_utf8data += _erts_pcre_ord2utf8(c, class_utf8data);
+ class_utf8data += _erts_pcre_ord2utf8(d, class_utf8data);
+
+ /* With UCP support, we are done. Without UCP support, there is no
+ caseless matching for UTF-8 characters > 127; we can use the bit map
+ for the smaller ones. */
+
+#ifdef SUPPORT_UCP
+ continue; /* With next character in the class */
+#else
+ if ((options & PCRE_CASELESS) == 0 || c > 127) continue;
+
+ /* Adjust upper limit and fall through to set up the map */
+
+ d = 127;
+
+#endif /* SUPPORT_UCP */
+ }
+#endif /* SUPPORT_UTF8 */
+
+ /* We use the bit map for all cases when not in UTF-8 mode; else
+ ranges that lie entirely within 0-127 when there is UCP support; else
+ for partial ranges without UCP support. */
+
+ class_charcount += d - c + 1;
+ class_lastchar = d;
+
+ /* We can save a bit of time by skipping this in the pre-compile. */
+
+ if (lengthptr == NULL) for (; c <= d; c++)
+ {
+ classbits[c/8] |= (1 << (c&7));
+ if ((options & PCRE_CASELESS) != 0)
+ {
+ int uc = cd->fcc[c]; /* flip case */
+ classbits[uc/8] |= (1 << (uc&7));
+ }
+ }
+
+ continue; /* Go get the next char in the class */
+ }
+
+ /* Handle a lone single character - we can get here for a normal
+ non-escape char, or after \ that introduces a single character or for an
+ apparent range that isn't. */
+
+ LONE_SINGLE_CHARACTER:
+
+ /* Handle a character that cannot go in the bit map */
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && (c > 255 || ((options & PCRE_CASELESS) != 0 && c > 127)))
+ {
+ class_utf8 = TRUE;
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(c, class_utf8data);
+
+#ifdef SUPPORT_UCP
+ if ((options & PCRE_CASELESS) != 0)
+ {
+ unsigned int othercase;
+ if ((othercase = _erts_pcre_ucp_othercase(c)) != NOTACHAR)
+ {
+ *class_utf8data++ = XCL_SINGLE;
+ class_utf8data += _erts_pcre_ord2utf8(othercase, class_utf8data);
+ }
+ }
+#endif /* SUPPORT_UCP */
+
+ }
+ else
+#endif /* SUPPORT_UTF8 */
+
+ /* Handle a single-byte character */
+ {
+ classbits[c/8] |= (1 << (c&7));
+ if ((options & PCRE_CASELESS) != 0)
+ {
+ c = cd->fcc[c]; /* flip case */
+ classbits[c/8] |= (1 << (c&7));
+ }
+ class_charcount++;
+ class_lastchar = c;
+ }
+ }
+
+ /* Loop until ']' reached. This "while" is the end of the "do" above. */
+
+ while ((c = *(++ptr)) != 0 && (c != ']' || inescq));
+
+ if (c == 0) /* Missing terminating ']' */
+ {
+ *errorcodeptr = ERR6;
+ goto FAILED;
+ }
+
+
+/* This code has been disabled because it would mean that \s counts as
+an explicit \r or \n reference, and that's not really what is wanted. Now
+we set the flag only if there is a literal "\r" or "\n" in the class. */
+
+#if 0
+ /* Remember whether \r or \n are in this class */
+
+ if (negate_class)
+ {
+ if ((classbits[1] & 0x24) != 0x24) cd->external_flags |= PCRE_HASCRORLF;
+ }
+ else
+ {
+ if ((classbits[1] & 0x24) != 0) cd->external_flags |= PCRE_HASCRORLF;
+ }
+#endif
+
+
+ /* If class_charcount is 1, we saw precisely one character whose value is
+ less than 256. As long as there were no characters >= 128 and there was no
+ use of \p or \P, in other words, no use of any XCLASS features, we can
+ optimize.
+
+ In UTF-8 mode, we can optimize the negative case only if there were no
+ characters >= 128 because OP_NOT and the related opcodes like OP_NOTSTAR
+ operate on single-bytes only. This is an historical hangover. Maybe one day
+ we can tidy these opcodes to handle multi-byte characters.
+
+ The optimization throws away the bit map. We turn the item into a
+ 1-character OP_CHAR[NC] if it's positive, or OP_NOT if it's negative. Note
+ that OP_NOT does not support multibyte characters. In the positive case, it
+ can cause firstbyte to be set. Otherwise, there can be no first char if
+ this item is first, whatever repeat count may follow. In the case of
+ reqbyte, save the previous value for reinstating. */
+
+#ifdef SUPPORT_UTF8
+ if (class_charcount == 1 && !class_utf8 &&
+ (!utf8 || !negate_class || class_lastchar < 128))
+#else
+ if (class_charcount == 1)
+#endif
+ {
+ zeroreqbyte = reqbyte;
+
+ /* The OP_NOT opcode works on one-byte characters only. */
+
+ if (negate_class)
+ {
+ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
+ zerofirstbyte = firstbyte;
+ *code++ = OP_NOT;
+ *code++ = class_lastchar;
+ break;
+ }
+
+ /* For a single, positive character, get the value into mcbuffer, and
+ then we can handle this with the normal one-character code. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && class_lastchar > 127)
+ mclength = _erts_pcre_ord2utf8(class_lastchar, mcbuffer);
+ else
+#endif
+ {
+ mcbuffer[0] = class_lastchar;
+ mclength = 1;
+ }
+ goto ONE_CHAR;
+ } /* End of 1-char optimization */
+
+ /* The general case - not the one-char optimization. If this is the first
+ thing in the branch, there can be no first char setting, whatever the
+ repeat count. Any reqbyte setting must remain unchanged after any kind of
+ repeat. */
+
+ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
+ zerofirstbyte = firstbyte;
+ zeroreqbyte = reqbyte;
+
+ /* If there are characters with values > 255, we have to compile an
+ extended class, with its own opcode, unless there was a negated special
+ such as \S in the class, because in that case all characters > 255 are in
+ the class, so any that were explicitly given as well can be ignored. If
+ (when there are explicit characters > 255 that must be listed) there are no
+ characters < 256, we can omit the bitmap in the actual compiled code. */
+
+#ifdef SUPPORT_UTF8
+ if (class_utf8 && !should_flip_negation)
+ {
+ *class_utf8data++ = XCL_END; /* Marks the end of extra data */
+ *code++ = OP_XCLASS;
+ code += LINK_SIZE;
+ *code = negate_class? XCL_NOT : 0;
+
+ /* If the map is required, move up the extra data to make room for it;
+ otherwise just move the code pointer to the end of the extra data. */
+
+ if (class_charcount > 0)
+ {
+ *code++ |= XCL_MAP;
+ memmove(code + 32, code, class_utf8data - code);
+ memcpy(code, classbits, 32);
+ code = class_utf8data + 32;
+ }
+ else code = class_utf8data;
+
+ /* Now fill in the complete length of the item */
+
+ PUT(previous, 1, code - previous);
+ break; /* End of class handling */
+ }
+#endif
+
+ /* If there are no characters > 255, set the opcode to OP_CLASS or
+ OP_NCLASS, depending on whether the whole class was negated and whether
+ there were negative specials such as \S in the class. Then copy the 32-byte
+ map into the code vector, negating it if necessary. */
+
+ *code++ = (negate_class == should_flip_negation) ? OP_CLASS : OP_NCLASS;
+ if (negate_class)
+ {
+ if (lengthptr == NULL) /* Save time in the pre-compile phase */
+ for (c = 0; c < 32; c++) code[c] = ~classbits[c];
+ }
+ else
+ {
+ memcpy(code, classbits, 32);
+ }
+ code += 32;
+ break;
+
+
+ /* ===================================================================*/
+ /* Various kinds of repeat; '{' is not necessarily a quantifier, but this
+ has been tested above. */
+
+ case '{':
+ if (!is_quantifier) goto NORMAL_CHAR;
+ ptr = read_repeat_counts(ptr+1, &repeat_min, &repeat_max, errorcodeptr);
+ if (*errorcodeptr != 0) 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)
+ {
+ *errorcodeptr = ERR9;
+ goto FAILED;
+ }
+
+ if (repeat_min == 0)
+ {
+ firstbyte = zerofirstbyte; /* Adjust for zero repeat */
+ reqbyte = zeroreqbyte; /* Ditto */
+ }
+
+ /* Remember whether this is a variable length repeat */
+
+ reqvary = (repeat_min == repeat_max)? 0 : REQ_VARY;
+
+ op_type = 0; /* Default single-char op codes */
+ possessive_quantifier = FALSE; /* Default not possessive quantifier */
+
+ /* Save start of previous item, in case we have to move it up to make space
+ for an inserted OP_ONCE for the additional '+' extension. */
+
+ tempcode = previous;
+
+ /* If the next character is '+', we have a possessive quantifier. This
+ implies greediness, whatever the setting of the PCRE_UNGREEDY option.
+ If the next character is '?' this is a minimizing repeat, by default,
+ but if PCRE_UNGREEDY is set, it works the other way round. We change the
+ repeat type to the non-default. */
+
+ if (ptr[1] == '+')
+ {
+ repeat_type = 0; /* Force greedy */
+ possessive_quantifier = TRUE;
+ ptr++;
+ }
+ else if (ptr[1] == '?')
+ {
+ repeat_type = greedy_non_default;
+ ptr++;
+ }
+ else repeat_type = greedy_default;
+
+ /* If previous was a character match, abolish the item and generate a
+ repeat item instead. If a char item has a minumum of more than one, ensure
+ that it is set in reqbyte - it might not be if a sequence such as x{3} is
+ the first thing in a branch because the x will have gone into firstbyte
+ instead. */
+
+ if (*previous == OP_CHAR || *previous == OP_CHARNC)
+ {
+ /* Deal with UTF-8 characters that take up more than one byte. It's
+ easier to write this out separately than try to macrify it. Use c to
+ hold the length of the character in bytes, plus 0x80 to flag that it's a
+ length rather than a small character. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && (code[-1] & 0x80) != 0)
+ {
+ uschar *lastchar = code - 1;
+ while((*lastchar & 0xc0) == 0x80) lastchar--;
+ c = code - lastchar; /* Length of UTF-8 character */
+ memcpy(utf8_char, lastchar, c); /* Save the char */
+ c |= 0x80; /* Flag c as a length */
+ }
+ else
+#endif
+
+ /* Handle the case of a single byte - either with no UTF8 support, or
+ with UTF-8 disabled, or for a UTF-8 character < 128. */
+
+ {
+ c = code[-1];
+ if (repeat_min > 1) reqbyte = c | req_caseopt | cd->req_varyopt;
+ }
+
+ /* If the repetition is unlimited, it pays to see if the next thing on
+ the line is something that cannot possibly match this character. If so,
+ automatically possessifying this item gains some performance in the case
+ where the match fails. */
+
+ if (!possessive_quantifier &&
+ repeat_max < 0 &&
+ check_auto_possessive(*previous, c, utf8, utf8_char, ptr + 1,
+ options, cd))
+ {
+ repeat_type = 0; /* Force greedy */
+ possessive_quantifier = TRUE;
+ }
+
+ goto OUTPUT_SINGLE_REPEAT; /* Code shared with single character types */
+ }
+
+ /* If previous was a single negated character ([^a] or similar), we use
+ one of the special opcodes, replacing it. The code is shared with single-
+ character repeats by setting opt_type to add a suitable offset into
+ repeat_type. We can also test for auto-possessification. OP_NOT is
+ currently used only for single-byte chars. */
+
+ else if (*previous == OP_NOT)
+ {
+ op_type = OP_NOTSTAR - OP_STAR; /* Use "not" opcodes */
+ c = previous[1];
+ if (!possessive_quantifier &&
+ repeat_max < 0 &&
+ check_auto_possessive(OP_NOT, c, utf8, NULL, ptr + 1, options, cd))
+ {
+ repeat_type = 0; /* Force greedy */
+ possessive_quantifier = TRUE;
+ }
+ goto OUTPUT_SINGLE_REPEAT;
+ }
+
+ /* 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 setting op_type to add a suitable offset into repeat_type. Note
+ the the Unicode property types will be present only when SUPPORT_UCP is
+ defined, but we don't wrap the little bits of code here because it just
+ makes it horribly messy. */
+
+ else if (*previous < OP_EODN)
+ {
+ uschar *oldcode;
+ int prop_type, prop_value;
+ op_type = OP_TYPESTAR - OP_STAR; /* Use type opcodes */
+ c = *previous;
+
+ if (!possessive_quantifier &&
+ repeat_max < 0 &&
+ check_auto_possessive(c, 0, utf8, NULL, ptr + 1, options, cd))
+ {
+ repeat_type = 0; /* Force greedy */
+ possessive_quantifier = TRUE;
+ }
+
+ OUTPUT_SINGLE_REPEAT:
+ if (*previous == OP_PROP || *previous == OP_NOTPROP)
+ {
+ prop_type = previous[1];
+ prop_value = previous[2];
+ }
+ else prop_type = prop_value = -1;
+
+ oldcode = code;
+ code = previous; /* Usually overwrite previous item */
+
+ /* If the maximum is zero then the minimum must also be zero; Perl allows
+ this case, so we do too - by simply omitting the item altogether. */
+
+ if (repeat_max == 0) goto END_REPEAT;
+
+ /* All real repeats make it impossible to handle partial matching (maybe
+ one day we will be able to remove this restriction). */
+
+ if (repeat_max != 1) cd->external_flags |= PCRE_NOPARTIAL;
+
+ /* Combine the op_type with the repeat_type */
+
+ repeat_type += op_type;
+
+ /* 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;
+ PUT2INC(code, 0, repeat_max);
+ }
+ }
+
+ /* A repeat minimum of 1 is optimized into some special cases. If the
+ maximum is unlimited, we use OP_PLUS. Otherwise, the original item is
+ left in place and, if the maximum is greater than 1, we use OP_UPTO with
+ one less than the maximum. */
+
+ else if (repeat_min == 1)
+ {
+ if (repeat_max == -1)
+ *code++ = OP_PLUS + repeat_type;
+ else
+ {
+ code = oldcode; /* leave previous item in place */
+ if (repeat_max == 1) goto END_REPEAT;
+ *code++ = OP_UPTO + repeat_type;
+ PUT2INC(code, 0, repeat_max - 1);
+ }
+ }
+
+ /* The case {n,n} is just an EXACT, while the general case {n,m} is
+ handled as an EXACT followed by an UPTO. */
+
+ else
+ {
+ *code++ = OP_EXACT + op_type; /* NB EXACT doesn't have repeat_type */
+ PUT2INC(code, 0, repeat_min);
+
+ /* If the maximum is unlimited, insert an OP_STAR. Before doing so,
+ we have to insert the character for the previous code. For a repeated
+ Unicode property match, there are two extra bytes that define the
+ required property. In UTF-8 mode, long characters have their length in
+ c, with the 0x80 bit as a flag. */
+
+ if (repeat_max < 0)
+ {
+#ifdef SUPPORT_UTF8
+ if (utf8 && c >= 128)
+ {
+ memcpy(code, utf8_char, c & 7);
+ code += c & 7;
+ }
+ else
+#endif
+ {
+ *code++ = c;
+ if (prop_type >= 0)
+ {
+ *code++ = prop_type;
+ *code++ = prop_value;
+ }
+ }
+ *code++ = OP_STAR + repeat_type;
+ }
+
+ /* Else insert an UPTO if the max is greater than the min, again
+ preceded by the character, for the previously inserted code. If the
+ UPTO is just for 1 instance, we can use QUERY instead. */
+
+ else if (repeat_max != repeat_min)
+ {
+#ifdef SUPPORT_UTF8
+ if (utf8 && c >= 128)
+ {
+ memcpy(code, utf8_char, c & 7);
+ code += c & 7;
+ }
+ else
+#endif
+ *code++ = c;
+ if (prop_type >= 0)
+ {
+ *code++ = prop_type;
+ *code++ = prop_value;
+ }
+ repeat_max -= repeat_min;
+
+ if (repeat_max == 1)
+ {
+ *code++ = OP_QUERY + repeat_type;
+ }
+ else
+ {
+ *code++ = OP_UPTO + repeat_type;
+ PUT2INC(code, 0, repeat_max);
+ }
+ }
+ }
+
+ /* The character or character type itself comes last in all cases. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && c >= 128)
+ {
+ memcpy(code, utf8_char, c & 7);
+ code += c & 7;
+ }
+ else
+#endif
+ *code++ = c;
+
+ /* For a repeated Unicode property match, there are two extra bytes that
+ define the required property. */
+
+#ifdef SUPPORT_UCP
+ if (prop_type >= 0)
+ {
+ *code++ = prop_type;
+ *code++ = prop_value;
+ }
+#endif
+ }
+
+ /* If previous was a character class or a back reference, we put the repeat
+ stuff after it, but just skip the item if the repeat was {0,0}. */
+
+ else if (*previous == OP_CLASS ||
+ *previous == OP_NCLASS ||
+#ifdef SUPPORT_UTF8
+ *previous == OP_XCLASS ||
+#endif
+ *previous == OP_REF)
+ {
+ if (repeat_max == 0)
+ {
+ code = previous;
+ goto END_REPEAT;
+ }
+
+ /* All real repeats make it impossible to handle partial matching (maybe
+ one day we will be able to remove this restriction). */
+
+ if (repeat_max != 1) cd->external_flags |= PCRE_NOPARTIAL;
+
+ 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;
+ PUT2INC(code, 0, repeat_min);
+ if (repeat_max == -1) repeat_max = 0; /* 2-byte encoding for max */
+ PUT2INC(code, 0, repeat_max);
+ }
+ }
+
+ /* If previous was a bracket group, we may have to replicate it in certain
+ cases. */
+
+ else if (*previous == OP_BRA || *previous == OP_CBRA ||
+ *previous == OP_ONCE || *previous == OP_COND)
+ {
+ register int i;
+ int ketoffset = 0;
+ int len = code - previous;
+ uschar *bralink = NULL;
+
+ /* Repeating a DEFINE group is pointless */
+
+ if (*previous == OP_COND && previous[LINK_SIZE+1] == OP_DEF)
+ {
+ *errorcodeptr = ERR55;
+ goto FAILED;
+ }
+
+ /* If the maximum repeat count is unlimited, find the end of the bracket
+ by scanning through from the start, and compute the offset back to it
+ from the current code pointer. There may be an OP_OPT setting following
+ the final KET, so we can't find the end just by going back from the code
+ pointer. */
+
+ if (repeat_max == -1)
+ {
+ register uschar *ket = previous;
+ do ket += GET(ket, 1); while (*ket != OP_KET);
+ ketoffset = code - ket;
+ }
+
+ /* The case of a zero minimum is special because of the need to stick
+ OP_BRAZERO in front of it, and because the group appears once in the
+ data, whereas in other cases it appears the minimum number of times. For
+ this reason, it is simplest to treat this case separately, as otherwise
+ the code gets far too messy. There are several special subcases when the
+ minimum is zero. */
+
+ if (repeat_min == 0)
+ {
+ /* If the maximum is also zero, we just omit the group from the output
+ altogether. */
+
+ if (repeat_max == 0)
+ {
+ code = previous;
+ goto END_REPEAT;
+ }
+
+ /* If the maximum is 1 or unlimited, we just have to stick in the
+ BRAZERO and do no more at this point. However, we do need to adjust
+ any OP_RECURSE calls inside the group that refer to the group itself or
+ any internal or forward referenced group, because the offset is from
+ the start of the whole regex. Temporarily terminate the pattern while
+ doing this. */
+
+ if (repeat_max <= 1)
+ {
+ *code = OP_END;
+ adjust_recurse(previous, 1, utf8, cd, save_hwm);
+ memmove(previous+1, previous, len);
+ code++;
+ *previous++ = OP_BRAZERO + repeat_type;
+ }
+
+ /* If the maximum is greater than 1 and limited, we have to replicate
+ in a nested fashion, sticking OP_BRAZERO before each set of brackets.
+ The first one has to be handled carefully because it's the original
+ copy, which has to be moved up. The remainder can be handled by code
+ that is common with the non-zero minimum case below. We have to
+ adjust the value or repeat_max, since one less copy is required. Once
+ again, we may have to adjust any OP_RECURSE calls inside the group. */
+
+ else
+ {
+ int offset;
+ *code = OP_END;
+ adjust_recurse(previous, 2 + LINK_SIZE, utf8, cd, save_hwm);
+ memmove(previous + 2 + LINK_SIZE, previous, len);
+ code += 2 + LINK_SIZE;
+ *previous++ = OP_BRAZERO + repeat_type;
+ *previous++ = OP_BRA;
+
+ /* We chain together the bracket offset fields that have to be
+ filled in later when the ends of the brackets are reached. */
+
+ offset = (bralink == NULL)? 0 : previous - bralink;
+ bralink = previous;
+ PUTINC(previous, 0, offset);
+ }
+
+ repeat_max--;
+ }
+
+ /* If the minimum is greater than zero, replicate the group as many
+ times as necessary, and adjust the maximum to the number of subsequent
+ copies that we need. If we set a first char from the group, and didn't
+ set a required char, copy the latter from the former. If there are any
+ forward reference subroutine calls in the group, there will be entries on
+ the workspace list; replicate these with an appropriate increment. */
+
+ else
+ {
+ if (repeat_min > 1)
+ {
+ /* In the pre-compile phase, we don't actually do the replication. We
+ just adjust the length as if we had. Do some paranoid checks for
+ potential integer overflow. */
+
+ if (lengthptr != NULL)
+ {
+ int delta = (repeat_min - 1)*length_prevgroup;
+ if ((double)(repeat_min - 1)*(double)length_prevgroup >
+ (double)INT_MAX ||
+ OFLOW_MAX - *lengthptr < delta)
+ {
+ *errorcodeptr = ERR20;
+ goto FAILED;
+ }
+ *lengthptr += delta;
+ }
+
+ /* This is compiling for real */
+
+ else
+ {
+ if (groupsetfirstbyte && reqbyte < 0) reqbyte = firstbyte;
+ for (i = 1; i < repeat_min; i++)
+ {
+ uschar *hc;
+ uschar *this_hwm = cd->hwm;
+ memcpy(code, previous, len);
+ for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE)
+ {
+ PUT(cd->hwm, 0, GET(hc, 0) + len);
+ cd->hwm += LINK_SIZE;
+ }
+ save_hwm = this_hwm;
+ code += len;
+ }
+ }
+ }
+
+ if (repeat_max > 0) repeat_max -= repeat_min;
+ }
+
+ /* This code is common to both the zero and non-zero minimum cases. If
+ the maximum is limited, it replicates the group in a nested fashion,
+ remembering the bracket starts on a stack. In the case of a zero minimum,
+ the first one was set up above. In all cases the repeat_max now specifies
+ the number of additional copies needed. Again, we must remember to
+ replicate entries on the forward reference list. */
+
+ if (repeat_max >= 0)
+ {
+ /* In the pre-compile phase, we don't actually do the replication. We
+ just adjust the length as if we had. For each repetition we must add 1
+ to the length for BRAZERO and for all but the last repetition we must
+ add 2 + 2*LINKSIZE to allow for the nesting that occurs. Do some
+ paranoid checks to avoid integer overflow. */
+
+ if (lengthptr != NULL && repeat_max > 0)
+ {
+ int delta = repeat_max * (length_prevgroup + 1 + 2 + 2*LINK_SIZE) -
+ 2 - 2*LINK_SIZE; /* Last one doesn't nest */
+ if ((double)repeat_max *
+ (double)(length_prevgroup + 1 + 2 + 2*LINK_SIZE)
+ > (double)INT_MAX ||
+ OFLOW_MAX - *lengthptr < delta)
+ {
+ *errorcodeptr = ERR20;
+ goto FAILED;
+ }
+ *lengthptr += delta;
+ }
+
+ /* This is compiling for real */
+
+ else for (i = repeat_max - 1; i >= 0; i--)
+ {
+ uschar *hc;
+ uschar *this_hwm = cd->hwm;
+
+ *code++ = OP_BRAZERO + repeat_type;
+
+ /* All but the final copy start a new nesting, maintaining the
+ chain of brackets outstanding. */
+
+ if (i != 0)
+ {
+ int offset;
+ *code++ = OP_BRA;
+ offset = (bralink == NULL)? 0 : code - bralink;
+ bralink = code;
+ PUTINC(code, 0, offset);
+ }
+
+ memcpy(code, previous, len);
+ for (hc = save_hwm; hc < this_hwm; hc += LINK_SIZE)
+ {
+ PUT(cd->hwm, 0, GET(hc, 0) + len + ((i != 0)? 2+LINK_SIZE : 1));
+ cd->hwm += LINK_SIZE;
+ }
+ save_hwm = this_hwm;
+ code += len;
+ }
+
+ /* Now chain through the pending brackets, and fill in their length
+ fields (which are holding the chain links pro tem). */
+
+ while (bralink != NULL)
+ {
+ int oldlinkoffset;
+ int offset = code - bralink + 1;
+ uschar *bra = code - offset;
+ oldlinkoffset = GET(bra, 1);
+ bralink = (oldlinkoffset == 0)? NULL : bralink - oldlinkoffset;
+ *code++ = OP_KET;
+ PUTINC(code, 0, offset);
+ PUT(bra, 1, offset);
+ }
+ }
+
+ /* If the maximum is unlimited, set a repeater in the final copy. We
+ can't just offset backwards from the current code point, because we
+ don't know if there's been an options resetting after the ket. The
+ correct offset was computed above.
+
+ Then, when we are doing the actual compile phase, check to see whether
+ this group is a non-atomic one that could match an empty string. If so,
+ convert the initial operator to the S form (e.g. OP_BRA -> OP_SBRA) so
+ that runtime checking can be done. [This check is also applied to
+ atomic groups at runtime, but in a different way.] */
+
+ else
+ {
+ uschar *ketcode = code - ketoffset;
+ uschar *bracode = ketcode - GET(ketcode, 1);
+ *ketcode = OP_KETRMAX + repeat_type;
+ if (lengthptr == NULL && *bracode != OP_ONCE)
+ {
+ uschar *scode = bracode;
+ do
+ {
+ if (could_be_empty_branch(scode, ketcode, utf8))
+ {
+ *bracode += OP_SBRA - OP_BRA;
+ break;
+ }
+ scode += GET(scode, 1);
+ }
+ while (*scode == OP_ALT);
+ }
+ }
+ }
+
+ /* Else there's some kind of shambles */
+
+ else
+ {
+ *errorcodeptr = ERR11;
+ goto FAILED;
+ }
+
+ /* If the character following a repeat is '+', or if certain optimization
+ tests above succeeded, possessive_quantifier is TRUE. For some of the
+ simpler opcodes, there is an special alternative opcode for this. For
+ anything else, we wrap the entire repeated item inside OP_ONCE brackets.
+ The '+' notation is just syntactic sugar, taken from Sun's Java package,
+ but the special opcodes can optimize it a bit. The repeated item starts at
+ tempcode, not at previous, which might be the first part of a string whose
+ (former) last char we repeated.
+
+ Possessifying an 'exact' quantifier has no effect, so we can ignore it. But
+ an 'upto' may follow. We skip over an 'exact' item, and then test the
+ length of what remains before proceeding. */
+
+ if (possessive_quantifier)
+ {
+ int len;
+ if (*tempcode == OP_EXACT || *tempcode == OP_TYPEEXACT ||
+ *tempcode == OP_NOTEXACT)
+ tempcode += _erts_pcre_OP_lengths[*tempcode] +
+ ((*tempcode == OP_TYPEEXACT &&
+ (tempcode[3] == OP_PROP || tempcode[3] == OP_NOTPROP))? 2:0);
+ len = code - tempcode;
+ if (len > 0) switch (*tempcode)
+ {
+ case OP_STAR: *tempcode = OP_POSSTAR; break;
+ case OP_PLUS: *tempcode = OP_POSPLUS; break;
+ case OP_QUERY: *tempcode = OP_POSQUERY; break;
+ case OP_UPTO: *tempcode = OP_POSUPTO; break;
+
+ case OP_TYPESTAR: *tempcode = OP_TYPEPOSSTAR; break;
+ case OP_TYPEPLUS: *tempcode = OP_TYPEPOSPLUS; break;
+ case OP_TYPEQUERY: *tempcode = OP_TYPEPOSQUERY; break;
+ case OP_TYPEUPTO: *tempcode = OP_TYPEPOSUPTO; break;
+
+ case OP_NOTSTAR: *tempcode = OP_NOTPOSSTAR; break;
+ case OP_NOTPLUS: *tempcode = OP_NOTPOSPLUS; break;
+ case OP_NOTQUERY: *tempcode = OP_NOTPOSQUERY; break;
+ case OP_NOTUPTO: *tempcode = OP_NOTPOSUPTO; break;
+
+ default:
+ memmove(tempcode + 1+LINK_SIZE, tempcode, len);
+ code += 1 + LINK_SIZE;
+ len += 1 + LINK_SIZE;
+ tempcode[0] = OP_ONCE;
+ *code++ = OP_KET;
+ PUTINC(code, 0, len);
+ PUT(tempcode, 1, len);
+ break;
+ }
+ }
+
+ /* In all case we no longer have a previous item. We also set the
+ "follows varying string" flag for subsequently encountered reqbytes if
+ it isn't already set and we have just passed a varying length item. */
+
+ END_REPEAT:
+ previous = NULL;
+ cd->req_varyopt |= reqvary;
+ break;
+
+
+ /* ===================================================================*/
+ /* Start of nested parenthesized sub-expression, or comment or lookahead or
+ lookbehind or option setting or condition or all the other extended
+ parenthesis forms. */
+
+ case '(':
+ newoptions = options;
+ skipbytes = 0;
+ bravalue = OP_CBRA;
+ save_hwm = cd->hwm;
+ reset_bracount = FALSE;
+
+ /* First deal with various "verbs" that can be introduced by '*'. */
+
+ if (*(++ptr) == '*' && (cd->ctypes[ptr[1]] & ctype_letter) != 0)
+ {
+ int i, namelen;
+ const char *vn = verbnames;
+ const uschar *name = ++ptr;
+ previous = NULL;
+ while ((cd->ctypes[*++ptr] & ctype_letter) != 0);
+ if (*ptr == ':')
+ {
+ *errorcodeptr = ERR59; /* Not supported */
+ goto FAILED;
+ }
+ if (*ptr != ')')
+ {
+ *errorcodeptr = ERR60;
+ goto FAILED;
+ }
+ namelen = ptr - name;
+ for (i = 0; i < verbcount; i++)
+ {
+ if (namelen == verbs[i].len &&
+ strncmp((char *)name, vn, namelen) == 0)
+ {
+ *code = verbs[i].op;
+ if (*code++ == OP_ACCEPT) cd->had_accept = TRUE;
+ break;
+ }
+ vn += verbs[i].len + 1;
+ }
+ if (i < verbcount) continue;
+ *errorcodeptr = ERR60;
+ goto FAILED;
+ }
+
+ /* Deal with the extended parentheses; all are introduced by '?', and the
+ appearance of any of them means that this is not a capturing group. */
+
+ else if (*ptr == '?')
+ {
+ int i, set, unset, namelen;
+ int *optset;
+ const uschar *name;
+ uschar *slot;
+
+ switch (*(++ptr))
+ {
+ case '#': /* Comment; skip to ket */
+ ptr++;
+ while (*ptr != 0 && *ptr != ')') ptr++;
+ if (*ptr == 0)
+ {
+ *errorcodeptr = ERR18;
+ goto FAILED;
+ }
+ continue;
+
+
+ /* ------------------------------------------------------------ */
+ case '|': /* Reset capture count for each branch */
+ reset_bracount = TRUE;
+ /* Fall through */
+
+ /* ------------------------------------------------------------ */
+ case ':': /* Non-capturing bracket */
+ bravalue = OP_BRA;
+ ptr++;
+ break;
+
+
+ /* ------------------------------------------------------------ */
+ case '(':
+ bravalue = OP_COND; /* Conditional group */
+
+ /* A condition can be an assertion, a number (referring to a numbered
+ group), a name (referring to a named group), or 'R', referring to
+ recursion. R<digits> and R&name are also permitted for recursion tests.
+
+ There are several syntaxes for testing a named group: (?(name)) is used
+ by Python; Perl 5.10 onwards uses (?(<name>) or (?('name')).
+
+ There are two unfortunate ambiguities, caused by history. (a) 'R' can
+ be the recursive thing or the name 'R' (and similarly for 'R' followed
+ by digits), and (b) a number could be a name that consists of digits.
+ In both cases, we look for a name first; if not found, we try the other
+ cases. */
+
+ /* For conditions that are assertions, check the syntax, and then exit
+ the switch. This will take control down to where bracketed groups,
+ including assertions, are processed. */
+
+ if (ptr[1] == '?' && (ptr[2] == '=' || ptr[2] == '!' || ptr[2] == '<'))
+ break;
+
+ /* Most other conditions use OP_CREF (a couple change to OP_RREF
+ below), and all need to skip 3 bytes at the start of the group. */
+
+ code[1+LINK_SIZE] = OP_CREF;
+ skipbytes = 3;
+ refsign = -1;
+
+ /* Check for a test for recursion in a named group. */
+
+ if (ptr[1] == 'R' && ptr[2] == '&')
+ {
+ terminator = -1;
+ ptr += 2;
+ code[1+LINK_SIZE] = OP_RREF; /* Change the type of test */
+ }
+
+ /* Check for a test for a named group's having been set, using the Perl
+ syntax (?(<name>) or (?('name') */
+
+ else if (ptr[1] == '<')
+ {
+ terminator = '>';
+ ptr++;
+ }
+ else if (ptr[1] == '\'')
+ {
+ terminator = '\'';
+ ptr++;
+ }
+ else
+ {
+ terminator = 0;
+ if (ptr[1] == '-' || ptr[1] == '+') refsign = *(++ptr);
+ }
+
+ /* We now expect to read a name; any thing else is an error */
+
+ if ((cd->ctypes[ptr[1]] & ctype_word) == 0)
+ {
+ ptr += 1; /* To get the right offset */
+ *errorcodeptr = ERR28;
+ goto FAILED;
+ }
+
+ /* Read the name, but also get it as a number if it's all digits */
+
+ recno = 0;
+ name = ++ptr;
+ while ((cd->ctypes[*ptr] & ctype_word) != 0)
+ {
+ if (recno >= 0)
+ recno = ((digitab[*ptr] & ctype_digit) != 0)?
+ recno * 10 + *ptr - '0' : -1;
+ ptr++;
+ }
+ namelen = ptr - name;
+
+ if ((terminator > 0 && *ptr++ != terminator) || *ptr++ != ')')
+ {
+ ptr--; /* Error offset */
+ *errorcodeptr = ERR26;
+ goto FAILED;
+ }
+
+ /* Do no further checking in the pre-compile phase. */
+
+ if (lengthptr != NULL) break;
+
+ /* In the real compile we do the work of looking for the actual
+ reference. If the string started with "+" or "-" we require the rest to
+ be digits, in which case recno will be set. */
+
+ if (refsign > 0)
+ {
+ if (recno <= 0)
+ {
+ *errorcodeptr = ERR58;
+ goto FAILED;
+ }
+ recno = (refsign == '-')?
+ cd->bracount - recno + 1 : recno +cd->bracount;
+ if (recno <= 0 || recno > cd->final_bracount)
+ {
+ *errorcodeptr = ERR15;
+ goto FAILED;
+ }
+ PUT2(code, 2+LINK_SIZE, recno);
+ break;
+ }
+
+ /* Otherwise (did not start with "+" or "-"), start by looking for the
+ name. */
+
+ slot = cd->name_table;
+ for (i = 0; i < cd->names_found; i++)
+ {
+ if (strncmp((char *)name, (char *)slot+2, namelen) == 0) break;
+ slot += cd->name_entry_size;
+ }
+
+ /* Found a previous named subpattern */
+
+ if (i < cd->names_found)
+ {
+ recno = GET2(slot, 0);
+ PUT2(code, 2+LINK_SIZE, recno);
+ }
+
+ /* Search the pattern for a forward reference */
+
+ else if ((i = find_parens(ptr, cd->bracount, name, namelen,
+ (options & PCRE_EXTENDED) != 0)) > 0)
+ {
+ PUT2(code, 2+LINK_SIZE, i);
+ }
+
+ /* If terminator == 0 it means that the name followed directly after
+ the opening parenthesis [e.g. (?(abc)...] and in this case there are
+ some further alternatives to try. For the cases where terminator != 0
+ [things like (?(<name>... or (?('name')... or (?(R&name)... ] we have
+ now checked all the possibilities, so give an error. */
+
+ else if (terminator != 0)
+ {
+ *errorcodeptr = ERR15;
+ goto FAILED;
+ }
+
+ /* Check for (?(R) for recursion. Allow digits after R to specify a
+ specific group number. */
+
+ else if (*name == 'R')
+ {
+ recno = 0;
+ for (i = 1; i < namelen; i++)
+ {
+ if ((digitab[name[i]] & ctype_digit) == 0)
+ {
+ *errorcodeptr = ERR15;
+ goto FAILED;
+ }
+ recno = recno * 10 + name[i] - '0';
+ }
+ if (recno == 0) recno = RREF_ANY;
+ code[1+LINK_SIZE] = OP_RREF; /* Change test type */
+ PUT2(code, 2+LINK_SIZE, recno);
+ }
+
+ /* Similarly, check for the (?(DEFINE) "condition", which is always
+ false. */
+
+ else if (namelen == 6 && strncmp((char *)name, "DEFINE", 6) == 0)
+ {
+ code[1+LINK_SIZE] = OP_DEF;
+ skipbytes = 1;
+ }
+
+ /* Check for the "name" actually being a subpattern number. We are
+ in the second pass here, so final_bracount is set. */
+
+ else if (recno > 0 && recno <= cd->final_bracount)
+ {
+ PUT2(code, 2+LINK_SIZE, recno);
+ }
+
+ /* Either an unidentified subpattern, or a reference to (?(0) */
+
+ else
+ {
+ *errorcodeptr = (recno == 0)? ERR35: ERR15;
+ goto FAILED;
+ }
+ break;
+
+
+ /* ------------------------------------------------------------ */
+ case '=': /* Positive lookahead */
+ bravalue = OP_ASSERT;
+ ptr++;
+ break;
+
+
+ /* ------------------------------------------------------------ */
+ case '!': /* Negative lookahead */
+ ptr++;
+ if (*ptr == ')') /* Optimize (?!) */
+ {
+ *code++ = OP_FAIL;
+ previous = NULL;
+ continue;
+ }
+ bravalue = OP_ASSERT_NOT;
+ break;
+
+
+ /* ------------------------------------------------------------ */
+ case '<': /* Lookbehind or named define */
+ switch (ptr[1])
+ {
+ case '=': /* Positive lookbehind */
+ bravalue = OP_ASSERTBACK;
+ ptr += 2;
+ break;
+
+ case '!': /* Negative lookbehind */
+ bravalue = OP_ASSERTBACK_NOT;
+ ptr += 2;
+ break;
+
+ default: /* Could be name define, else bad */
+ if ((cd->ctypes[ptr[1]] & ctype_word) != 0) goto DEFINE_NAME;
+ ptr++; /* Correct offset for error */
+ *errorcodeptr = ERR24;
+ goto FAILED;
+ }
+ break;
+
+
+ /* ------------------------------------------------------------ */
+ case '>': /* One-time brackets */
+ bravalue = OP_ONCE;
+ ptr++;
+ break;
+
+
+ /* ------------------------------------------------------------ */
+ case 'C': /* Callout - may be followed by digits; */
+ previous_callout = code; /* Save for later completion */
+ after_manual_callout = 1; /* Skip one item before completing */
+ *code++ = OP_CALLOUT;
+ {
+ int n = 0;
+ while ((digitab[*(++ptr)] & ctype_digit) != 0)
+ n = n * 10 + *ptr - '0';
+ if (*ptr != ')')
+ {
+ *errorcodeptr = ERR39;
+ goto FAILED;
+ }
+ if (n > 255)
+ {
+ *errorcodeptr = ERR38;
+ goto FAILED;
+ }
+ *code++ = n;
+ PUT(code, 0, ptr - cd->start_pattern + 1); /* Pattern offset */
+ PUT(code, LINK_SIZE, 0); /* Default length */
+ code += 2 * LINK_SIZE;
+ }
+ previous = NULL;
+ continue;
+
+
+ /* ------------------------------------------------------------ */
+ case 'P': /* Python-style named subpattern handling */
+ if (*(++ptr) == '=' || *ptr == '>') /* Reference or recursion */
+ {
+ is_recurse = *ptr == '>';
+ terminator = ')';
+ goto NAMED_REF_OR_RECURSE;
+ }
+ else if (*ptr != '<') /* Test for Python-style definition */
+ {
+ *errorcodeptr = ERR41;
+ goto FAILED;
+ }
+ /* Fall through to handle (?P< as (?< is handled */
+
+
+ /* ------------------------------------------------------------ */
+ DEFINE_NAME: /* Come here from (?< handling */
+ case '\'':
+ {
+ terminator = (*ptr == '<')? '>' : '\'';
+ name = ++ptr;
+
+ while ((cd->ctypes[*ptr] & ctype_word) != 0) ptr++;
+ namelen = ptr - name;
+
+ /* In the pre-compile phase, just do a syntax check. */
+
+ if (lengthptr != NULL)
+ {
+ if (*ptr != terminator)
+ {
+ *errorcodeptr = ERR42;
+ goto FAILED;
+ }
+ if (cd->names_found >= MAX_NAME_COUNT)
+ {
+ *errorcodeptr = ERR49;
+ goto FAILED;
+ }
+ if (namelen + 3 > cd->name_entry_size)
+ {
+ cd->name_entry_size = namelen + 3;
+ if (namelen > MAX_NAME_SIZE)
+ {
+ *errorcodeptr = ERR48;
+ goto FAILED;
+ }
+ }
+ }
+
+ /* In the real compile, create the entry in the table */
+
+ else
+ {
+ slot = cd->name_table;
+ for (i = 0; i < cd->names_found; i++)
+ {
+ int crc = memcmp(name, slot+2, namelen);
+ if (crc == 0)
+ {
+ if (slot[2+namelen] == 0)
+ {
+ if ((options & PCRE_DUPNAMES) == 0)
+ {
+ *errorcodeptr = ERR43;
+ goto FAILED;
+ }
+ }
+ else crc = -1; /* Current name is substring */
+ }
+ if (crc < 0)
+ {
+ memmove(slot + cd->name_entry_size, slot,
+ (cd->names_found - i) * cd->name_entry_size);
+ break;
+ }
+ slot += cd->name_entry_size;
+ }
+
+ PUT2(slot, 0, cd->bracount + 1);
+ memcpy(slot + 2, name, namelen);
+ slot[2+namelen] = 0;
+ }
+ }
+
+ /* In both cases, count the number of names we've encountered. */
+
+ ptr++; /* Move past > or ' */
+ cd->names_found++;
+ goto NUMBERED_GROUP;
+
+
+ /* ------------------------------------------------------------ */
+ case '&': /* Perl recursion/subroutine syntax */
+ terminator = ')';
+ is_recurse = TRUE;
+ /* Fall through */
+
+ /* We come here from the Python syntax above that handles both
+ references (?P=name) and recursion (?P>name), as well as falling
+ through from the Perl recursion syntax (?&name). We also come here from
+ the Perl \k<name> or \k'name' back reference syntax and the \k{name}
+ .NET syntax. */
+
+ NAMED_REF_OR_RECURSE:
+ name = ++ptr;
+ while ((cd->ctypes[*ptr] & ctype_word) != 0) ptr++;
+ namelen = ptr - name;
+
+ /* In the pre-compile phase, do a syntax check and set a dummy
+ reference number. */
+
+ if (lengthptr != NULL)
+ {
+ if (namelen == 0)
+ {
+ *errorcodeptr = ERR62;
+ goto FAILED;
+ }
+ if (*ptr != terminator)
+ {
+ *errorcodeptr = ERR42;
+ goto FAILED;
+ }
+ if (namelen > MAX_NAME_SIZE)
+ {
+ *errorcodeptr = ERR48;
+ goto FAILED;
+ }
+ recno = 0;
+ }
+
+ /* In the real compile, seek the name in the table. We check the name
+ first, and then check that we have reached the end of the name in the
+ table. That way, if the name that is longer than any in the table,
+ the comparison will fail without reading beyond the table entry. */
+
+ else
+ {
+ slot = cd->name_table;
+ for (i = 0; i < cd->names_found; i++)
+ {
+ if (strncmp((char *)name, (char *)slot+2, namelen) == 0 &&
+ slot[2+namelen] == 0)
+ break;
+ slot += cd->name_entry_size;
+ }
+
+ if (i < cd->names_found) /* Back reference */
+ {
+ recno = GET2(slot, 0);
+ }
+ else if ((recno = /* Forward back reference */
+ find_parens(ptr, cd->bracount, name, namelen,
+ (options & PCRE_EXTENDED) != 0)) <= 0)
+ {
+ *errorcodeptr = ERR15;
+ goto FAILED;
+ }
+ }
+
+ /* In both phases, we can now go to the code than handles numerical
+ recursion or backreferences. */
+
+ if (is_recurse) goto HANDLE_RECURSION;
+ else goto HANDLE_REFERENCE;
+
+
+ /* ------------------------------------------------------------ */
+ case 'R': /* Recursion */
+ ptr++; /* Same as (?0) */
+ /* Fall through */
+
+
+ /* ------------------------------------------------------------ */
+ case '-': case '+':
+ case '0': case '1': case '2': case '3': case '4': /* Recursion or */
+ case '5': case '6': case '7': case '8': case '9': /* subroutine */
+ {
+ const uschar *called;
+
+ if ((refsign = *ptr) == '+')
+ {
+ ptr++;
+ if ((digitab[*ptr] & ctype_digit) == 0)
+ {
+ *errorcodeptr = ERR63;
+ goto FAILED;
+ }
+ }
+ else if (refsign == '-')
+ {
+ if ((digitab[ptr[1]] & ctype_digit) == 0)
+ goto OTHER_CHAR_AFTER_QUERY;
+ ptr++;
+ }
+
+ recno = 0;
+ while((digitab[*ptr] & ctype_digit) != 0)
+ recno = recno * 10 + *ptr++ - '0';
+
+ if (*ptr != ')')
+ {
+ *errorcodeptr = ERR29;
+ goto FAILED;
+ }
+
+ if (refsign == '-')
+ {
+ if (recno == 0)
+ {
+ *errorcodeptr = ERR58;
+ goto FAILED;
+ }
+ recno = cd->bracount - recno + 1;
+ if (recno <= 0)
+ {
+ *errorcodeptr = ERR15;
+ goto FAILED;
+ }
+ }
+ else if (refsign == '+')
+ {
+ if (recno == 0)
+ {
+ *errorcodeptr = ERR58;
+ goto FAILED;
+ }
+ recno += cd->bracount;
+ }
+
+ /* Come here from code above that handles a named recursion */
+
+ HANDLE_RECURSION:
+
+ previous = code;
+ called = cd->start_code;
+
+ /* When we are actually compiling, find the bracket that is being
+ referenced. Temporarily end the regex in case it doesn't exist before
+ this point. If we end up with a forward reference, first check that
+ the bracket does occur later so we can give the error (and position)
+ now. Then remember this forward reference in the workspace so it can
+ be filled in at the end. */
+
+ if (lengthptr == NULL)
+ {
+ *code = OP_END;
+ if (recno != 0) called = find_bracket(cd->start_code, utf8, recno);
+
+ /* Forward reference */
+
+ if (called == NULL)
+ {
+ if (find_parens(ptr, cd->bracount, NULL, recno,
+ (options & PCRE_EXTENDED) != 0) < 0)
+ {
+ *errorcodeptr = ERR15;
+ goto FAILED;
+ }
+ called = cd->start_code + recno;
+ PUTINC(cd->hwm, 0, code + 2 + LINK_SIZE - cd->start_code);
+ }
+
+ /* If not a forward reference, and the subpattern is still open,
+ this is a recursive call. We check to see if this is a left
+ recursion that could loop for ever, and diagnose that case. */
+
+ else if (GET(called, 1) == 0 &&
+ could_be_empty(called, code, bcptr, utf8))
+ {
+ *errorcodeptr = ERR40;
+ goto FAILED;
+ }
+ }
+
+ /* Insert the recursion/subroutine item, automatically wrapped inside
+ "once" brackets. Set up a "previous group" length so that a
+ subsequent quantifier will work. */
+
+ *code = OP_ONCE;
+ PUT(code, 1, 2 + 2*LINK_SIZE);
+ code += 1 + LINK_SIZE;
+
+ *code = OP_RECURSE;
+ PUT(code, 1, called - cd->start_code);
+ code += 1 + LINK_SIZE;
+
+ *code = OP_KET;
+ PUT(code, 1, 2 + 2*LINK_SIZE);
+ code += 1 + LINK_SIZE;
+
+ length_prevgroup = 3 + 3*LINK_SIZE;
+ }
+
+ /* Can't determine a first byte now */
+
+ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
+ continue;
+
+
+ /* ------------------------------------------------------------ */
+ default: /* Other characters: check option setting */
+ OTHER_CHAR_AFTER_QUERY:
+ set = unset = 0;
+ optset = &set;
+
+ while (*ptr != ')' && *ptr != ':')
+ {
+ switch (*ptr++)
+ {
+ case '-': optset = &unset; break;
+
+ case 'J': /* Record that it changed in the external options */
+ *optset |= PCRE_DUPNAMES;
+ cd->external_flags |= PCRE_JCHANGED;
+ break;
+
+ case 'i': *optset |= PCRE_CASELESS; break;
+ case 'm': *optset |= PCRE_MULTILINE; break;
+ case 's': *optset |= PCRE_DOTALL; break;
+ case 'x': *optset |= PCRE_EXTENDED; break;
+ case 'U': *optset |= PCRE_UNGREEDY; break;
+ case 'X': *optset |= PCRE_EXTRA; break;
+
+ default: *errorcodeptr = ERR12;
+ ptr--; /* Correct the offset */
+ goto FAILED;
+ }
+ }
+
+ /* Set up the changed option bits, but don't change anything yet. */
+
+ newoptions = (options | set) & (~unset);
+
+ /* If the options ended with ')' this is not the start of a nested
+ group with option changes, so the options change at this level. If this
+ item is right at the start of the pattern, the options can be
+ abstracted and made external in the pre-compile phase, and ignored in
+ the compile phase. This can be helpful when matching -- for instance in
+ caseless checking of required bytes.
+
+ If the code pointer is not (cd->start_code + 1 + LINK_SIZE), we are
+ definitely *not* at the start of the pattern because something has been
+ compiled. In the pre-compile phase, however, the code pointer can have
+ that value after the start, because it gets reset as code is discarded
+ during the pre-compile. However, this can happen only at top level - if
+ we are within parentheses, the starting BRA will still be present. At
+ any parenthesis level, the length value can be used to test if anything
+ has been compiled at that level. Thus, a test for both these conditions
+ is necessary to ensure we correctly detect the start of the pattern in
+ both phases.
+
+ If we are not at the pattern start, compile code to change the ims
+ options if this setting actually changes any of them. We also pass the
+ new setting back so that it can be put at the start of any following
+ branches, and when this group ends (if we are in a group), a resetting
+ item can be compiled. */
+
+ if (*ptr == ')')
+ {
+ if (code == cd->start_code + 1 + LINK_SIZE &&
+ (lengthptr == NULL || *lengthptr == 2 + 2*LINK_SIZE))
+ {
+ cd->external_options = newoptions;
+ options = newoptions;
+ }
+ else
+ {
+ if ((options & PCRE_IMS) != (newoptions & PCRE_IMS))
+ {
+ *code++ = OP_OPT;
+ *code++ = newoptions & PCRE_IMS;
+ }
+
+ /* Change options at this level, and pass them back for use
+ in subsequent branches. Reset the greedy defaults and the case
+ value for firstbyte and reqbyte. */
+
+ *optionsptr = options = newoptions;
+ greedy_default = ((newoptions & PCRE_UNGREEDY) != 0);
+ greedy_non_default = greedy_default ^ 1;
+ req_caseopt = ((options & PCRE_CASELESS) != 0)? REQ_CASELESS : 0;
+ }
+
+ previous = NULL; /* This item can't be repeated */
+ continue; /* It is complete */
+ }
+
+ /* If the options ended with ':' we are heading into a nested group
+ with possible change of options. Such groups are non-capturing and are
+ not assertions of any kind. All we need to do is skip over the ':';
+ the newoptions value is handled below. */
+
+ bravalue = OP_BRA;
+ ptr++;
+ } /* End of switch for character following (? */
+ } /* End of (? handling */
+
+ /* Opening parenthesis not followed by '?'. If PCRE_NO_AUTO_CAPTURE is set,
+ all unadorned brackets become non-capturing and behave like (?:...)
+ brackets. */
+
+ else if ((options & PCRE_NO_AUTO_CAPTURE) != 0)
+ {
+ bravalue = OP_BRA;
+ }
+
+ /* Else we have a capturing group. */
+
+ else
+ {
+ NUMBERED_GROUP:
+ cd->bracount += 1;
+ PUT2(code, 1+LINK_SIZE, cd->bracount);
+ skipbytes = 2;
+ }
+
+ /* Process nested bracketed regex. Assertions may not be repeated, but
+ other kinds can be. All their opcodes are >= OP_ONCE. We copy code into a
+ non-register variable in order to be able to pass its address because some
+ compilers complain otherwise. Pass in a new setting for the ims options if
+ they have changed. */
+
+ previous = (bravalue >= OP_ONCE)? code : NULL;
+ *code = bravalue;
+ tempcode = code;
+ tempreqvary = cd->req_varyopt; /* Save value before bracket */
+ length_prevgroup = 0; /* Initialize for pre-compile phase */
+
+ if (!compile_regex(
+ newoptions, /* The complete new option state */
+ options & PCRE_IMS, /* The previous ims option state */
+ &tempcode, /* Where to put code (updated) */
+ &ptr, /* Input pointer (updated) */
+ errorcodeptr, /* Where to put an error message */
+ (bravalue == OP_ASSERTBACK ||
+ bravalue == OP_ASSERTBACK_NOT), /* TRUE if back assert */
+ reset_bracount, /* True if (?| group */
+ skipbytes, /* Skip over bracket number */
+ &subfirstbyte, /* For possible first char */
+ &subreqbyte, /* For possible last char */
+ bcptr, /* Current branch chain */
+ cd, /* Tables block */
+ (lengthptr == NULL)? NULL : /* Actual compile phase */
+ &length_prevgroup /* Pre-compile phase */
+ ))
+ goto FAILED;
+
+ /* At the end of compiling, code is still pointing to the start of the
+ group, while tempcode has been updated to point past the end of the group
+ and any option resetting that may follow it. The pattern pointer (ptr)
+ is on the bracket. */
+
+ /* If this is a conditional bracket, check that there are no more than
+ two branches in the group, or just one if it's a DEFINE group. We do this
+ in the real compile phase, not in the pre-pass, where the whole group may
+ not be available. */
+
+ if (bravalue == OP_COND && lengthptr == NULL)
+ {
+ uschar *tc = code;
+ int condcount = 0;
+
+ do {
+ condcount++;
+ tc += GET(tc,1);
+ }
+ while (*tc != OP_KET);
+
+ /* A DEFINE group is never obeyed inline (the "condition" is always
+ false). It must have only one branch. */
+
+ if (code[LINK_SIZE+1] == OP_DEF)
+ {
+ if (condcount > 1)
+ {
+ *errorcodeptr = ERR54;
+ goto FAILED;
+ }
+ bravalue = OP_DEF; /* Just a flag to suppress char handling below */
+ }
+
+ /* A "normal" conditional group. If there is just one branch, we must not
+ make use of its firstbyte or reqbyte, because this is equivalent to an
+ empty second branch. */
+
+ else
+ {
+ if (condcount > 2)
+ {
+ *errorcodeptr = ERR27;
+ goto FAILED;
+ }
+ if (condcount == 1) subfirstbyte = subreqbyte = REQ_NONE;
+ }
+ }
+
+ /* Error if hit end of pattern */
+
+ if (*ptr != ')')
+ {
+ *errorcodeptr = ERR14;
+ goto FAILED;
+ }
+
+ /* In the pre-compile phase, update the length by the length of the group,
+ less the brackets at either end. Then reduce the compiled code to just a
+ set of non-capturing brackets so that it doesn't use much memory if it is
+ duplicated by a quantifier.*/
+
+ if (lengthptr != NULL)
+ {
+ if (OFLOW_MAX - *lengthptr < length_prevgroup - 2 - 2*LINK_SIZE)
+ {
+ *errorcodeptr = ERR20;
+ goto FAILED;
+ }
+ *lengthptr += length_prevgroup - 2 - 2*LINK_SIZE;
+ *code++ = OP_BRA;
+ PUTINC(code, 0, 1 + LINK_SIZE);
+ *code++ = OP_KET;
+ PUTINC(code, 0, 1 + LINK_SIZE);
+ break; /* No need to waste time with special character handling */
+ }
+
+ /* Otherwise update the main code pointer to the end of the group. */
+
+ code = tempcode;
+
+ /* For a DEFINE group, required and first character settings are not
+ relevant. */
+
+ if (bravalue == OP_DEF) break;
+
+ /* Handle updating of the required and first characters for other types of
+ group. Update for normal brackets of all kinds, and conditions with two
+ branches (see code above). If the bracket is followed by a quantifier with
+ zero repeat, we have to back off. Hence the definition of zeroreqbyte and
+ zerofirstbyte outside the main loop so that they can be accessed for the
+ back off. */
+
+ zeroreqbyte = reqbyte;
+ zerofirstbyte = firstbyte;
+ groupsetfirstbyte = FALSE;
+
+ if (bravalue >= OP_ONCE)
+ {
+ /* If we have not yet set a firstbyte in this branch, take it from the
+ subpattern, remembering that it was set here so that a repeat of more
+ than one can replicate it as reqbyte if necessary. If the subpattern has
+ no firstbyte, set "none" for the whole branch. In both cases, a zero
+ repeat forces firstbyte to "none". */
+
+ if (firstbyte == REQ_UNSET)
+ {
+ if (subfirstbyte >= 0)
+ {
+ firstbyte = subfirstbyte;
+ groupsetfirstbyte = TRUE;
+ }
+ else firstbyte = REQ_NONE;
+ zerofirstbyte = REQ_NONE;
+ }
+
+ /* If firstbyte was previously set, convert the subpattern's firstbyte
+ into reqbyte if there wasn't one, using the vary flag that was in
+ existence beforehand. */
+
+ else if (subfirstbyte >= 0 && subreqbyte < 0)
+ subreqbyte = subfirstbyte | tempreqvary;
+
+ /* If the subpattern set a required byte (or set a first byte that isn't
+ really the first byte - see above), set it. */
+
+ if (subreqbyte >= 0) reqbyte = subreqbyte;
+ }
+
+ /* For a forward assertion, we take the reqbyte, if set. This can be
+ helpful if the pattern that follows the assertion doesn't set a different
+ char. For example, it's useful for /(?=abcde).+/. We can't set firstbyte
+ for an assertion, however because it leads to incorrect effect for patterns
+ such as /(?=a)a.+/ when the "real" "a" would then become a reqbyte instead
+ of a firstbyte. This is overcome by a scan at the end if there's no
+ firstbyte, looking for an asserted first char. */
+
+ else if (bravalue == OP_ASSERT && subreqbyte >= 0) reqbyte = subreqbyte;
+ break; /* End of processing '(' */
+
+
+ /* ===================================================================*/
+ /* Handle metasequences 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. */
+
+ case '\\':
+ tempptr = ptr;
+ c = check_escape(&ptr, errorcodeptr, cd->bracount, options, FALSE);
+ if (*errorcodeptr != 0) goto FAILED;
+
+ if (c < 0)
+ {
+ if (-c == ESC_Q) /* Handle start of quoted string */
+ {
+ if (ptr[1] == '\\' && ptr[2] == 'E') ptr += 2; /* avoid empty string */
+ else inescq = TRUE;
+ continue;
+ }
+
+ if (-c == ESC_E) continue; /* Perl ignores an orphan \E */
+
+ /* For metasequences that actually match a character, we disable the
+ setting of a first character if it hasn't already been set. */
+
+ if (firstbyte == REQ_UNSET && -c > ESC_b && -c < ESC_Z)
+ firstbyte = REQ_NONE;
+
+ /* Set values to reset to if this is followed by a zero repeat. */
+
+ zerofirstbyte = firstbyte;
+ zeroreqbyte = reqbyte;
+
+ /* \k<name> or \k'name' is a back reference by name (Perl syntax).
+ We also support \k{name} (.NET syntax) */
+
+ if (-c == ESC_k && (ptr[1] == '<' || ptr[1] == '\'' || ptr[1] == '{'))
+ {
+ is_recurse = FALSE;
+ terminator = (*(++ptr) == '<')? '>' : (*ptr == '\'')? '\'' : '}';
+ goto NAMED_REF_OR_RECURSE;
+ }
+
+ /* Back references are handled specially; must disable firstbyte if
+ not set to cope with cases like (?=(\w+))\1: which would otherwise set
+ ':' later. */
+
+ if (-c >= ESC_REF)
+ {
+ recno = -c - ESC_REF;
+
+ HANDLE_REFERENCE: /* Come here from named backref handling */
+ if (firstbyte == REQ_UNSET) firstbyte = REQ_NONE;
+ previous = code;
+ *code++ = OP_REF;
+ PUT2INC(code, 0, recno);
+ cd->backref_map |= (recno < 32)? (1 << recno) : 1;
+ if (recno > cd->top_backref) cd->top_backref = recno;
+ }
+
+ /* So are Unicode property matches, if supported. */
+
+#ifdef SUPPORT_UCP
+ else if (-c == ESC_P || -c == ESC_p)
+ {
+ BOOL negated;
+ int pdata;
+ int ptype = get_ucp(&ptr, &negated, &pdata, errorcodeptr);
+ if (ptype < 0) goto FAILED;
+ previous = code;
+ *code++ = ((-c == ESC_p) != negated)? OP_PROP : OP_NOTPROP;
+ *code++ = ptype;
+ *code++ = pdata;
+ }
+#else
+
+ /* If Unicode properties are not supported, \X, \P, and \p are not
+ allowed. */
+
+ else if (-c == ESC_X || -c == ESC_P || -c == ESC_p)
+ {
+ *errorcodeptr = ERR45;
+ goto FAILED;
+ }
+#endif
+
+ /* For the rest (including \X when Unicode properties are supported), we
+ can obtain the OP value by negating the escape value. */
+
+ else
+ {
+ previous = (-c > ESC_b && -c < ESC_Z)? code : NULL;
+ *code++ = -c;
+ }
+ continue;
+ }
+
+ /* We have a data character whose value is in c. In UTF-8 mode it may have
+ a value > 127. We set its representation in the length/buffer, and then
+ handle it as a data character. */
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && c > 127)
+ mclength = _erts_pcre_ord2utf8(c, mcbuffer);
+ else
+#endif
+
+ {
+ mcbuffer[0] = c;
+ mclength = 1;
+ }
+ goto ONE_CHAR;
+
+
+ /* ===================================================================*/
+ /* Handle a literal character. It is guaranteed not to be whitespace or #
+ when the extended flag is set. If we are in UTF-8 mode, it may be a
+ multi-byte literal character. */
+
+ default:
+ NORMAL_CHAR:
+ mclength = 1;
+ mcbuffer[0] = c;
+
+#ifdef SUPPORT_UTF8
+ if (utf8 && c >= 0xc0)
+ {
+ while ((ptr[1] & 0xc0) == 0x80)
+ mcbuffer[mclength++] = *(++ptr);
+ }
+#endif
+
+ /* At this point we have the character's bytes in mcbuffer, and the length
+ in mclength. When not in UTF-8 mode, the length is always 1. */
+
+ ONE_CHAR:
+ previous = code;
+ *code++ = ((options & PCRE_CASELESS) != 0)? OP_CHARNC : OP_CHAR;
+ for (c = 0; c < mclength; c++) *code++ = mcbuffer[c];
+
+ /* Remember if \r or \n were seen */
+
+ if (mcbuffer[0] == '\r' || mcbuffer[0] == '\n')
+ cd->external_flags |= PCRE_HASCRORLF;
+
+ /* Set the first and required bytes appropriately. If no previous first
+ byte, set it from this character, but revert to none on a zero repeat.
+ Otherwise, leave the firstbyte value alone, and don't change it on a zero
+ repeat. */
+
+ if (firstbyte == REQ_UNSET)
+ {
+ zerofirstbyte = REQ_NONE;
+ zeroreqbyte = reqbyte;
+
+ /* If the character is more than one byte long, we can set firstbyte
+ only if it is not to be matched caselessly. */
+
+ if (mclength == 1 || req_caseopt == 0)
+ {
+ firstbyte = mcbuffer[0] | req_caseopt;
+ if (mclength != 1) reqbyte = code[-1] | cd->req_varyopt;
+ }
+ else firstbyte = reqbyte = REQ_NONE;
+ }
+
+ /* firstbyte was previously set; we can set reqbyte only the length is
+ 1 or the matching is caseful. */
+
+ else
+ {
+ zerofirstbyte = firstbyte;
+ zeroreqbyte = reqbyte;
+ if (mclength == 1 || req_caseopt == 0)
+ reqbyte = code[-1] | req_caseopt | cd->req_varyopt;
+ }
+
+ break; /* End of literal character handling */
+ }
+ } /* 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.
+If the ims options are changed at the start (for a (?ims: group) or during any
+branch, we need to insert an OP_OPT item at the start of every following branch
+to ensure they get set correctly at run time, and also pass the new options
+into every subsequent branch compile.
+
+This function is used during the pre-compile phase when we are trying to find
+out the amount of memory needed, as well as during the real compile phase. The
+value of lengthptr distinguishes the two phases.
+
+Arguments:
+ options option bits, including any changes for this subpattern
+ oldims previous settings of ims option bits
+ codeptr -> the address of the current code pointer
+ ptrptr -> the address of the current pattern pointer
+ errorcodeptr -> pointer to error code variable
+ lookbehind TRUE if this is a lookbehind assertion
+ reset_bracount TRUE to reset the count for each branch
+ skipbytes skip this many bytes at start (for brackets and OP_COND)
+ firstbyteptr place to put the first required character, or a negative number
+ reqbyteptr place to put the last required character, or a negative number
+ bcptr pointer to the chain of currently open branches
+ cd points to the data block with tables pointers etc.
+ lengthptr NULL during the real compile phase
+ points to length accumulator during pre-compile phase
+
+Returns: TRUE on success
+*/
+
+static BOOL
+compile_regex(int options, int oldims, uschar **codeptr, const uschar **ptrptr,
+ int *errorcodeptr, BOOL lookbehind, BOOL reset_bracount, int skipbytes,
+ int *firstbyteptr, int *reqbyteptr, branch_chain *bcptr, compile_data *cd,
+ int *lengthptr)
+{
+const uschar *ptr = *ptrptr;
+uschar *code = *codeptr;
+uschar *last_branch = code;
+uschar *start_bracket = code;
+uschar *reverse_count = NULL;
+int firstbyte, reqbyte;
+int branchfirstbyte, branchreqbyte;
+int length;
+int orig_bracount;
+int max_bracount;
+branch_chain bc;
+
+bc.outer = bcptr;
+bc.current = code;
+
+firstbyte = reqbyte = REQ_UNSET;
+
+/* Accumulate the length for use in the pre-compile phase. Start with the
+length of the BRA and KET and any extra bytes that are required at the
+beginning. We accumulate in a local variable to save frequent testing of
+lenthptr for NULL. We cannot do this by looking at the value of code at the
+start and end of each alternative, because compiled items are discarded during
+the pre-compile phase so that the work space is not exceeded. */
+
+length = 2 + 2*LINK_SIZE + skipbytes;
+
+/* WARNING: If the above line is changed for any reason, you must also change
+the code that abstracts option settings at the start of the pattern and makes
+them global. It tests the value of length for (2 + 2*LINK_SIZE) in the
+pre-compile phase to find out whether anything has yet been compiled or not. */
+
+/* Offset is set zero to mark that this bracket is still open */
+
+PUT(code, 1, 0);
+code += 1 + LINK_SIZE + skipbytes;
+
+/* Loop for each alternative branch */
+
+orig_bracount = max_bracount = cd->bracount;
+for (;;)
+ {
+ /* For a (?| group, reset the capturing bracket count so that each branch
+ uses the same numbers. */
+
+ if (reset_bracount) cd->bracount = orig_bracount;
+
+ /* Handle a change of ims options at the start of the branch */
+
+ if ((options & PCRE_IMS) != oldims)
+ {
+ *code++ = OP_OPT;
+ *code++ = options & PCRE_IMS;
+ length += 2;
+ }
+
+ /* Set up dummy OP_REVERSE if lookbehind assertion */
+
+ if (lookbehind)
+ {
+ *code++ = OP_REVERSE;
+ reverse_count = code;
+ PUTINC(code, 0, 0);
+ length += 1 + LINK_SIZE;
+ }
+
+ /* Now compile the branch; in the pre-compile phase its length gets added
+ into the length. */
+
+ if (!compile_branch(&options, &code, &ptr, errorcodeptr, &branchfirstbyte,
+ &branchreqbyte, &bc, cd, (lengthptr == NULL)? NULL : &length))
+ {
+ *ptrptr = ptr;
+ return FALSE;
+ }
+
+ /* Keep the highest bracket count in case (?| was used and some branch
+ has fewer than the rest. */
+
+ if (cd->bracount > max_bracount) max_bracount = cd->bracount;
+
+ /* In the real compile phase, there is some post-processing to be done. */
+
+ if (lengthptr == NULL)
+ {
+ /* If this is the first branch, the firstbyte and reqbyte values for the
+ branch become the values for the regex. */
+
+ if (*last_branch != OP_ALT)
+ {
+ firstbyte = branchfirstbyte;
+ reqbyte = branchreqbyte;
+ }
+
+ /* If this is not the first branch, the first char and reqbyte have to
+ match the values from all the previous branches, except that if the
+ previous value for reqbyte didn't have REQ_VARY set, it can still match,
+ and we set REQ_VARY for the regex. */
+
+ else
+ {
+ /* If we previously had a firstbyte, but it doesn't match the new branch,
+ we have to abandon the firstbyte for the regex, but if there was
+ previously no reqbyte, it takes on the value of the old firstbyte. */
+
+ if (firstbyte >= 0 && firstbyte != branchfirstbyte)
+ {
+ if (reqbyte < 0) reqbyte = firstbyte;
+ firstbyte = REQ_NONE;
+ }
+
+ /* If we (now or from before) have no firstbyte, a firstbyte from the
+ branch becomes a reqbyte if there isn't a branch reqbyte. */
+
+ if (firstbyte < 0 && branchfirstbyte >= 0 && branchreqbyte < 0)
+ branchreqbyte = branchfirstbyte;
+
+ /* Now ensure that the reqbytes match */
+
+ if ((reqbyte & ~REQ_VARY) != (branchreqbyte & ~REQ_VARY))
+ reqbyte = REQ_NONE;
+ else reqbyte |= branchreqbyte; /* To "or" REQ_VARY */
+ }
+
+ /* If lookbehind, check that this branch matches a fixed-length string, and
+ put the length into the OP_REVERSE item. Temporarily mark the end of the
+ branch with OP_END. */
+
+ if (lookbehind)
+ {
+ int fixed_length;
+ *code = OP_END;
+ fixed_length = find_fixedlength(last_branch, options);
+ DPRINTF(("fixed length = %d\n", fixed_length));
+ if (fixed_length < 0)
+ {
+ *errorcodeptr = (fixed_length == -2)? ERR36 : ERR25;
+ *ptrptr = ptr;
+ return FALSE;
+ }
+ PUT(reverse_count, 0, fixed_length);
+ }
+ }
+
+ /* Reached end of expression, either ')' or end of pattern. In the real
+ compile phase, go back through the alternative branches and reverse the chain
+ of offsets, with the field in the BRA item now becoming an offset to the
+ first alternative. If there are no alternatives, it points to the end of the
+ group. The length in the terminating ket is always the length of the whole
+ bracketed item. If any of the ims options were changed inside the group,
+ compile a resetting op-code following, except at the very end of the pattern.
+ Return leaving the pointer at the terminating char. */
+
+ if (*ptr != '|')
+ {
+ if (lengthptr == NULL)
+ {
+ int branch_length = code - last_branch;
+ do
+ {
+ int prev_length = GET(last_branch, 1);
+ PUT(last_branch, 1, branch_length);
+ branch_length = prev_length;
+ last_branch -= branch_length;
+ }
+ while (branch_length > 0);
+ }
+
+ /* Fill in the ket */
+
+ *code = OP_KET;
+ PUT(code, 1, code - start_bracket);
+ code += 1 + LINK_SIZE;
+
+ /* Resetting option if needed */
+
+ if ((options & PCRE_IMS) != oldims && *ptr == ')')
+ {
+ *code++ = OP_OPT;
+ *code++ = oldims;
+ length += 2;
+ }
+
+ /* Retain the highest bracket number, in case resetting was used. */
+
+ cd->bracount = max_bracount;
+
+ /* Set values to pass back */
+
+ *codeptr = code;
+ *ptrptr = ptr;
+ *firstbyteptr = firstbyte;
+ *reqbyteptr = reqbyte;
+ if (lengthptr != NULL)
+ {
+ if (OFLOW_MAX - *lengthptr < length)
+ {
+ *errorcodeptr = ERR20;
+ return FALSE;
+ }
+ *lengthptr += length;
+ }
+ return TRUE;
+ }
+
+ /* Another branch follows. In the pre-compile phase, we can move the code
+ pointer back to where it was for the start of the first branch. (That is,
+ pretend that each branch is the only one.)
+
+ In the real compile phase, insert an ALT node. Its length field points back
+ to the previous branch while the bracket remains open. At the end the chain
+ is reversed. It's done like this so that the start of the bracket has a
+ zero offset until it is closed, making it possible to detect recursion. */
+
+ if (lengthptr != NULL)
+ {
+ code = *codeptr + 1 + LINK_SIZE + skipbytes;
+ length += 1 + LINK_SIZE;
+ }
+ else
+ {
+ *code = OP_ALT;
+ PUT(code, 1, code - last_branch);
+ bc.current = last_branch = code;
+ code += 1 + LINK_SIZE;
+ }
+
+ 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.
+
+We can also consider a regex to be anchored if OP_SOM starts all its branches.
+This is the code for \G, which means "match at start of match position, taking
+into account the match offset".
+
+A branch is also implicitly anchored if it starts with .* and DOTALL is set,
+because that will try the rest of the pattern at all possible matching points,
+so there is no point trying again.... er ....
+
+.... except when the .* appears inside capturing parentheses, and there is a
+subsequent back reference to those parentheses. We haven't enough information
+to catch that case precisely.
+
+At first, the best we could do was to detect when .* was in capturing brackets
+and the highest back reference was greater than or equal to that level.
+However, by keeping a bitmap of the first 31 back references, we can catch some
+of the more common cases more precisely.
+
+Arguments:
+ code points to start of expression (the bracket)
+ options points to the options setting
+ bracket_map a bitmap of which brackets we are inside while testing; this
+ handles up to substring 31; after that we just have to take
+ the less precise approach
+ backref_map the back reference bitmap
+
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+is_anchored(register const uschar *code, int *options, unsigned int bracket_map,
+ unsigned int backref_map)
+{
+do {
+ const uschar *scode = first_significant_code(code + _erts_pcre_OP_lengths[*code],
+ options, PCRE_MULTILINE, FALSE);
+ register int op = *scode;
+
+ /* Non-capturing brackets */
+
+ if (op == OP_BRA)
+ {
+ if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE;
+ }
+
+ /* Capturing brackets */
+
+ else if (op == OP_CBRA)
+ {
+ int n = GET2(scode, 1+LINK_SIZE);
+ int new_map = bracket_map | ((n < 32)? (1 << n) : 1);
+ if (!is_anchored(scode, options, new_map, backref_map)) return FALSE;
+ }
+
+ /* Other brackets */
+
+ else if (op == OP_ASSERT || op == OP_ONCE || op == OP_COND)
+ {
+ if (!is_anchored(scode, options, bracket_map, backref_map)) return FALSE;
+ }
+
+ /* .* is not anchored unless DOTALL is set and it isn't in brackets that
+ are or may be referenced. */
+
+ else if ((op == OP_TYPESTAR || op == OP_TYPEMINSTAR ||
+ op == OP_TYPEPOSSTAR) &&
+ (*options & PCRE_DOTALL) != 0)
+ {
+ if (scode[1] != OP_ANY || (bracket_map & backref_map) != 0) return FALSE;
+ }
+
+ /* Check for explicit anchoring */
+
+ else if (op != OP_SOD && op != OP_SOM &&
+ ((*options & PCRE_MULTILINE) != 0 || op != OP_CIRC))
+ return FALSE;
+ code += GET(code, 1);
+ }
+while (*code == OP_ALT); /* Loop for each alternative */
+return TRUE;
+}
+
+
+
+/*************************************************
+* Check for starting with ^ or .* *
+*************************************************/
+
+/* This is called to find out if every branch starts with ^ or .* so that
+"first char" processing can be done to speed things up in multiline
+matching and for non-DOTALL patterns that start with .* (which must start at
+the beginning or after \n). As in the case of is_anchored() (see above), we
+have to take account of back references to capturing brackets that contain .*
+because in that case we can't make the assumption.
+
+Arguments:
+ code points to start of expression (the bracket)
+ bracket_map a bitmap of which brackets we are inside while testing; this
+ handles up to substring 31; after that we just have to take
+ the less precise approach
+ backref_map the back reference bitmap
+
+Returns: TRUE or FALSE
+*/
+
+static BOOL
+is_startline(const uschar *code, unsigned int bracket_map,
+ unsigned int backref_map)
+{
+do {
+ const uschar *scode = first_significant_code(code + _erts_pcre_OP_lengths[*code],
+ NULL, 0, FALSE);
+ register int op = *scode;
+
+ /* Non-capturing brackets */
+
+ if (op == OP_BRA)
+ {
+ if (!is_startline(scode, bracket_map, backref_map)) return FALSE;
+ }
+
+ /* Capturing brackets */
+
+ else if (op == OP_CBRA)
+ {
+ int n = GET2(scode, 1+LINK_SIZE);
+ int new_map = bracket_map | ((n < 32)? (1 << n) : 1);
+ if (!is_startline(scode, new_map, backref_map)) return FALSE;
+ }
+
+ /* Other brackets */
+
+ else if (op == OP_ASSERT || op == OP_ONCE || op == OP_COND)
+ { if (!is_startline(scode, bracket_map, backref_map)) return FALSE; }
+
+ /* .* means "start at start or after \n" if it isn't in brackets that
+ may be referenced. */
+
+ else if (op == OP_TYPESTAR || op == OP_TYPEMINSTAR || op == OP_TYPEPOSSTAR)
+ {
+ if (scode[1] != OP_ANY || (bracket_map & backref_map) != 0) return FALSE;
+ }
+
+ /* Check for explicit circumflex */
+
+ else if (op != OP_CIRC) return FALSE;
+
+ /* Move on to the next alternative */
+
+ code += GET(code, 1);
+ }
+while (*code == OP_ALT); /* Loop for each alternative */
+return TRUE;
+}
+
+
+
+/*************************************************
+* Check for asserted fixed first char *
+*************************************************/
+
+/* During compilation, the "first char" settings from forward assertions are
+discarded, because they can cause conflicts with actual literals that follow.
+However, if we end up without a first char setting for an unanchored pattern,
+it is worth scanning the regex to see if there is an initial asserted first
+char. If all branches start with the same asserted char, or with a bracket all
+of whose alternatives start with the same asserted char (recurse ad lib), then
+we return that char, otherwise -1.
+
+Arguments:
+ code points to start of expression (the bracket)
+ options pointer to the options (used to check casing changes)
+ inassert TRUE if in an assertion
+
+Returns: -1 or the fixed first char
+*/
+
+static int
+find_firstassertedchar(const uschar *code, int *options, BOOL inassert)
+{
+register int c = -1;
+do {
+ int d;
+ const uschar *scode =
+ first_significant_code(code + 1+LINK_SIZE, options, PCRE_CASELESS, TRUE);
+ register int op = *scode;
+
+ switch(op)
+ {
+ default:
+ return -1;
+
+ case OP_BRA:
+ case OP_CBRA:
+ case OP_ASSERT:
+ case OP_ONCE:
+ case OP_COND:
+ if ((d = find_firstassertedchar(scode, options, op == OP_ASSERT)) < 0)
+ return -1;
+ if (c < 0) c = d; else if (c != d) return -1;
+ break;
+
+ case OP_EXACT: /* Fall through */
+ scode += 2;
+
+ case OP_CHAR:
+ case OP_CHARNC:
+ case OP_PLUS:
+ case OP_MINPLUS:
+ case OP_POSPLUS:
+ if (!inassert) return -1;
+ if (c < 0)
+ {
+ c = scode[1];
+ if ((*options & PCRE_CASELESS) != 0) c |= REQ_CASELESS;
+ }
+ else if (c != scode[1]) return -1;
+ break;
+ }
+
+ code += GET(code, 1);
+ }
+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. The original API for this
+function had no error code return variable; it is retained for backwards
+compatibility. The new function is given a new name.
+
+Arguments:
+ pattern the regular expression
+ options various option bits
+ errorcodeptr pointer to error code variable (erts_pcre_compile2() only)
+ can be NULL if you don't want a code value
+ errorptr pointer to pointer to error text
+ erroroffset ptr offset in pattern where error was detected
+ tables pointer to character tables or NULL
+
+Returns: pointer to compiled data block, or NULL on error,
+ with errorptr and erroroffset set
+*/
+
+PCRE_EXP_DEFN pcre *
+erts_pcre_compile(const char *pattern, int options, const char **errorptr,
+ int *erroroffset, const unsigned char *tables)
+{
+return erts_pcre_compile2(pattern, options, NULL, errorptr, erroroffset, tables);
+}
+
+
+PCRE_EXP_DEFN pcre *
+erts_pcre_compile2(const char *pattern, int options, int *errorcodeptr,
+ const char **errorptr, int *erroroffset, const unsigned char *tables)
+{
+real_pcre *re;
+int length = 1; /* For final END opcode */
+int firstbyte, reqbyte, newline;
+int errorcode = 0;
+int skipatstart = 0;
+#ifdef SUPPORT_UTF8
+BOOL utf8;
+#endif
+size_t size;
+uschar *code;
+const uschar *codestart;
+const uschar *ptr;
+compile_data compile_block;
+compile_data *cd = &compile_block;
+
+/* This space is used for "compiling" into during the first phase, when we are
+computing the amount of memory that is needed. Compiled items are thrown away
+as soon as possible, so that a fairly large buffer should be sufficient for
+this purpose. The same space is used in the second phase for remembering where
+to fill in forward references to subpatterns. */
+
+uschar cworkspace[COMPILE_WORK_SIZE];
+
+/* Set this early so that early errors get offset 0. */
+
+ptr = (const uschar *)pattern;
+
+/* We can't pass back an error message if errorptr is NULL; I guess the best we
+can do is just return NULL, but we can set a code value if there is a code
+pointer. */
+
+if (errorptr == NULL)
+ {
+ if (errorcodeptr != NULL) *errorcodeptr = 99;
+ return NULL;
+ }
+
+*errorptr = NULL;
+if (errorcodeptr != NULL) *errorcodeptr = ERR0;
+
+/* However, we can give a message for this error */
+
+if (erroroffset == NULL)
+ {
+ errorcode = ERR16;
+ goto PCRE_EARLY_ERROR_RETURN2;
+ }
+
+*erroroffset = 0;
+
+/* Can't support UTF8 unless PCRE has been compiled to include the code. */
+
+#ifdef SUPPORT_UTF8
+utf8 = (options & PCRE_UTF8) != 0;
+if (utf8 && (options & PCRE_NO_UTF8_CHECK) == 0 &&
+ (*erroroffset = _erts_pcre_valid_utf8((uschar *)pattern, -1)) >= 0)
+ {
+ errorcode = ERR44;
+ goto PCRE_EARLY_ERROR_RETURN2;
+ }
+#else
+if ((options & PCRE_UTF8) != 0)
+ {
+ errorcode = ERR32;
+ goto PCRE_EARLY_ERROR_RETURN;
+ }
+#endif
+
+if ((options & ~PUBLIC_OPTIONS) != 0)
+ {
+ errorcode = ERR17;
+ goto PCRE_EARLY_ERROR_RETURN;
+ }
+
+/* Set up pointers to the individual character tables */
+
+if (tables == NULL) tables = _erts_pcre_default_tables;
+cd->lcc = tables + lcc_offset;
+cd->fcc = tables + fcc_offset;
+cd->cbits = tables + cbits_offset;
+cd->ctypes = tables + ctypes_offset;
+
+/* Check for global one-time settings at the start of the pattern, and remember
+the offset for later. */
+
+while (ptr[skipatstart] == '(' && ptr[skipatstart+1] == '*')
+ {
+ int newnl = 0;
+ int newbsr = 0;
+
+ if (strncmp((char *)(ptr+skipatstart+2), "CR)", 3) == 0)
+ { skipatstart += 5; newnl = PCRE_NEWLINE_CR; }
+ else if (strncmp((char *)(ptr+skipatstart+2), "LF)", 3) == 0)
+ { skipatstart += 5; newnl = PCRE_NEWLINE_LF; }
+ else if (strncmp((char *)(ptr+skipatstart+2), "CRLF)", 5) == 0)
+ { skipatstart += 7; newnl = PCRE_NEWLINE_CR + PCRE_NEWLINE_LF; }
+ else if (strncmp((char *)(ptr+skipatstart+2), "ANY)", 4) == 0)
+ { skipatstart += 6; newnl = PCRE_NEWLINE_ANY; }
+ else if (strncmp((char *)(ptr+skipatstart+2), "ANYCRLF)", 8) == 0)
+ { skipatstart += 10; newnl = PCRE_NEWLINE_ANYCRLF; }
+
+ else if (strncmp((char *)(ptr+skipatstart+2), "BSR_ANYCRLF)", 12) == 0)
+ { skipatstart += 14; newbsr = PCRE_BSR_ANYCRLF; }
+ else if (strncmp((char *)(ptr+skipatstart+2), "BSR_UNICODE)", 12) == 0)
+ { skipatstart += 14; newbsr = PCRE_BSR_UNICODE; }
+
+ if (newnl != 0)
+ options = (options & ~PCRE_NEWLINE_BITS) | newnl;
+ else if (newbsr != 0)
+ options = (options & ~(PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE)) | newbsr;
+ else break;
+ }
+
+/* Check validity of \R options. */
+
+switch (options & (PCRE_BSR_ANYCRLF|PCRE_BSR_UNICODE))
+ {
+ case 0:
+ case PCRE_BSR_ANYCRLF:
+ case PCRE_BSR_UNICODE:
+ break;
+ default: errorcode = ERR56; goto PCRE_EARLY_ERROR_RETURN;
+ }
+
+/* Handle different types of newline. The three bits give seven cases. The
+current code allows for fixed one- or two-byte sequences, plus "any" and
+"anycrlf". */
+
+switch (options & PCRE_NEWLINE_BITS)
+ {
+ case 0: newline = NEWLINE; break; /* Build-time default */
+ case PCRE_NEWLINE_CR: newline = '\r'; break;
+ case PCRE_NEWLINE_LF: newline = '\n'; break;
+ case PCRE_NEWLINE_CR+
+ PCRE_NEWLINE_LF: newline = ('\r' << 8) | '\n'; break;
+ case PCRE_NEWLINE_ANY: newline = -1; break;
+ case PCRE_NEWLINE_ANYCRLF: newline = -2; break;
+ default: errorcode = ERR56; goto PCRE_EARLY_ERROR_RETURN;
+ }
+
+if (newline == -2)
+ {
+ cd->nltype = NLTYPE_ANYCRLF;
+ }
+else if (newline < 0)
+ {
+ cd->nltype = NLTYPE_ANY;
+ }
+else
+ {
+ cd->nltype = NLTYPE_FIXED;
+ if (newline > 255)
+ {
+ cd->nllen = 2;
+ cd->nl[0] = (newline >> 8) & 255;
+ cd->nl[1] = newline & 255;
+ }
+ else
+ {
+ cd->nllen = 1;
+ cd->nl[0] = newline;
+ }
+ }
+
+/* Maximum back reference and backref bitmap. The bitmap records up to 31 back
+references to help in deciding whether (.*) can be treated as anchored or not.
+*/
+
+cd->top_backref = 0;
+cd->backref_map = 0;
+
+/* Reflect pattern for debugging output */
+
+DPRINTF(("------------------------------------------------------------------\n"));
+DPRINTF(("%s\n", pattern));
+
+/* Pretend to compile the pattern while actually just accumulating the length
+of memory required. This behaviour is triggered by passing a non-NULL final
+argument to compile_regex(). We pass a block of workspace (cworkspace) for it
+to compile parts of the pattern into; the compiled code is discarded when it is
+no longer needed, so hopefully this workspace will never overflow, though there
+is a test for its doing so. */
+
+cd->bracount = cd->final_bracount = 0;
+cd->names_found = 0;
+cd->name_entry_size = 0;
+cd->name_table = NULL;
+cd->start_workspace = cworkspace;
+cd->start_code = cworkspace;
+cd->hwm = cworkspace;
+cd->start_pattern = (const uschar *)pattern;
+cd->end_pattern = (const uschar *)(pattern + strlen(pattern));
+cd->req_varyopt = 0;
+cd->external_options = options;
+cd->external_flags = 0;
+
+/* Now do the pre-compile. On error, errorcode will be set non-zero, so we
+don't need to look at the result of the function here. The initial options have
+been put into the cd block so that they can be changed if an option setting is
+found within the regex right at the beginning. Bringing initial option settings
+outside can help speed up starting point checks. */
+
+ptr += skipatstart;
+code = cworkspace;
+*code = OP_BRA;
+(void)compile_regex(cd->external_options, cd->external_options & PCRE_IMS,
+ &code, &ptr, &errorcode, FALSE, FALSE, 0, &firstbyte, &reqbyte, NULL, cd,
+ &length);
+if (errorcode != 0) goto PCRE_EARLY_ERROR_RETURN;
+
+DPRINTF(("end pre-compile: length=%d workspace=%d\n", length,
+ cd->hwm - cworkspace));
+
+if (length > MAX_PATTERN_SIZE)
+ {
+ errorcode = ERR20;
+ goto PCRE_EARLY_ERROR_RETURN;
+ }
+
+/* Compute the size of data block needed and get it, either from malloc or
+externally provided function. Integer overflow should no longer be possible
+because nowadays we limit the maximum value of cd->names_found and
+cd->name_entry_size. */
+
+size = length + sizeof(real_pcre) + cd->names_found * (cd->name_entry_size + 3);
+re = (real_pcre *)(erts_pcre_malloc)(size);
+
+if (re == NULL)
+ {
+ errorcode = ERR21;
+ goto PCRE_EARLY_ERROR_RETURN;
+ }
+
+/* Put in the magic number, and save the sizes, initial options, internal
+flags, and character table pointer. NULL is used for the default character
+tables. The nullpad field is at the end; it's there to help in the case when a
+regex compiled on a system with 4-byte pointers is run on another with 8-byte
+pointers. */
+
+re->magic_number = MAGIC_NUMBER;
+re->size = size;
+re->options = cd->external_options;
+re->flags = cd->external_flags;
+re->dummy1 = 0;
+re->first_byte = 0;
+re->req_byte = 0;
+re->name_table_offset = sizeof(real_pcre);
+re->name_entry_size = cd->name_entry_size;
+re->name_count = cd->names_found;
+re->ref_count = 0;
+re->tables = (tables == _erts_pcre_default_tables)? NULL : tables;
+re->nullpad = NULL;
+
+/* The starting points of the name/number translation table and of the code are
+passed around in the compile data block. The start/end pattern and initial
+options are already set from the pre-compile phase, as is the name_entry_size
+field. Reset the bracket count and the names_found field. Also reset the hwm
+field; this time it's used for remembering forward references to subpatterns.
+*/
+
+cd->final_bracount = cd->bracount; /* Save for checking forward references */
+cd->bracount = 0;
+cd->names_found = 0;
+cd->name_table = (uschar *)re + re->name_table_offset;
+codestart = cd->name_table + re->name_entry_size * re->name_count;
+cd->start_code = codestart;
+cd->hwm = cworkspace;
+cd->req_varyopt = 0;
+cd->had_accept = FALSE;
+
+/* Set up a starting, non-extracting bracket, then compile the expression. On
+error, errorcode will be set non-zero, so we don't need to look at the result
+of the function here. */
+
+ptr = (const uschar *)pattern + skipatstart;
+code = (uschar *)codestart;
+*code = OP_BRA;
+(void)compile_regex(re->options, re->options & PCRE_IMS, &code, &ptr,
+ &errorcode, FALSE, FALSE, 0, &firstbyte, &reqbyte, NULL, cd, NULL);
+re->top_bracket = cd->bracount;
+re->top_backref = cd->top_backref;
+re->flags = cd->external_flags;
+
+if (cd->had_accept) reqbyte = -1; /* Must disable after (*ACCEPT) */
+
+/* If not reached end of pattern on success, there's an excess bracket. */
+
+if (errorcode == 0 && *ptr != 0) errorcode = ERR22;
+
+/* 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 - codestart > length) errorcode = ERR23;
+#endif
+
+/* Fill in any forward references that are required. */
+
+while (errorcode == 0 && cd->hwm > cworkspace)
+ {
+ int offset, recno;
+ const uschar *groupptr;
+ cd->hwm -= LINK_SIZE;
+ offset = GET(cd->hwm, 0);
+ recno = GET(codestart, offset);
+ groupptr = find_bracket(codestart, (re->options & PCRE_UTF8) != 0, recno);
+ if (groupptr == NULL) errorcode = ERR53;
+ else PUT(((uschar *)codestart), offset, groupptr - codestart);
+ }
+
+/* Give an error if there's back reference to a non-existent capturing
+subpattern. */
+
+if (errorcode == 0 && re->top_backref > re->top_bracket) errorcode = ERR15;
+
+/* Failed to compile, or error while post-processing */
+
+if (errorcode != 0)
+ {
+ (erts_pcre_free)(re);
+ PCRE_EARLY_ERROR_RETURN:
+ *erroroffset = ptr - (const uschar *)pattern;
+ PCRE_EARLY_ERROR_RETURN2:
+ *errorptr = find_error_text(errorcode);
+ if (errorcodeptr != NULL) *errorcodeptr = errorcode;
+ return NULL;
+ }
+
+/* If the anchored option was not passed, set the flag if we can determine that
+the pattern is anchored by virtue of ^ characters or \A or anything else (such
+as starting with .* when DOTALL is set).
+
+Otherwise, if we know what the first byte has to be, save it, because that
+speeds up unanchored matches no end. If not, see if we can set the
+PCRE_STARTLINE flag. This is helpful for multiline matches when all branches
+start with ^. and also when all branches start with .* for non-DOTALL matches.
+*/
+
+if ((re->options & PCRE_ANCHORED) == 0)
+ {
+ int temp_options = re->options; /* May get changed during these scans */
+ if (is_anchored(codestart, &temp_options, 0, cd->backref_map))
+ re->options |= PCRE_ANCHORED;
+ else
+ {
+ if (firstbyte < 0)
+ firstbyte = find_firstassertedchar(codestart, &temp_options, FALSE);
+ if (firstbyte >= 0) /* Remove caseless flag for non-caseable chars */
+ {
+ int ch = firstbyte & 255;
+ re->first_byte = ((firstbyte & REQ_CASELESS) != 0 &&
+ cd->fcc[ch] == ch)? ch : firstbyte;
+ re->flags |= PCRE_FIRSTSET;
+ }
+ else if (is_startline(codestart, 0, cd->backref_map))
+ re->flags |= PCRE_STARTLINE;
+ }
+ }
+
+/* For an anchored pattern, we use the "required byte" only if it follows a
+variable length item in the regex. Remove the caseless flag for non-caseable
+bytes. */
+
+if (reqbyte >= 0 &&
+ ((re->options & PCRE_ANCHORED) == 0 || (reqbyte & REQ_VARY) != 0))
+ {
+ int ch = reqbyte & 255;
+ re->req_byte = ((reqbyte & REQ_CASELESS) != 0 &&
+ cd->fcc[ch] == ch)? (reqbyte & ~REQ_CASELESS) : reqbyte;
+ re->flags |= PCRE_REQCHSET;
+ }
+
+/* Print out the compiled data if debugging is enabled. This is never the
+case when building a production library. */
+
+#ifdef DEBUG
+
+printf("Length = %d top_bracket = %d top_backref = %d\n",
+ length, re->top_bracket, re->top_backref);
+
+printf("Options=%08x\n", re->options);
+
+if ((re->flags & PCRE_FIRSTSET) != 0)
+ {
+ int ch = re->first_byte & 255;
+ const char *caseless = ((re->first_byte & REQ_CASELESS) == 0)?
+ "" : " (caseless)";
+ if (isprint(ch)) printf("First char = %c%s\n", ch, caseless);
+ else printf("First char = \\x%02x%s\n", ch, caseless);
+ }
+
+if ((re->flags & PCRE_REQCHSET) != 0)
+ {
+ int ch = re->req_byte & 255;
+ const char *caseless = ((re->req_byte & REQ_CASELESS) == 0)?
+ "" : " (caseless)";
+ if (isprint(ch)) printf("Req char = %c%s\n", ch, caseless);
+ else printf("Req char = \\x%02x%s\n", ch, caseless);
+ }
+
+pcre_printint(re, stdout, TRUE);
+
+/* This check is done here in the debugging case so that the code that
+was compiled can be seen. */
+
+if (code - codestart > length)
+ {
+ (erts_pcre_free)(re);
+ *errorptr = find_error_text(ERR23);
+ *erroroffset = ptr - (uschar *)pattern;
+ if (errorcodeptr != NULL) *errorcodeptr = ERR23;
+ return NULL;
+ }
+#endif /* DEBUG */
+
+return (pcre *)re;
+}
+
+/* End of pcre_compile.c */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 05:42:41 +0000