382 lines
15 KiB
C
382 lines
15 KiB
C
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/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* This is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language. See
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the file Tech.Notes for some information on the internals.
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Written by: Philip Hazel <ph10@cam.ac.uk>
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Copyright (c) 1997-2000 University of Cambridge
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-----------------------------------------------------------------------------
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Permission is granted to anyone to use this software for any purpose on any
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computer system, and to redistribute it freely, subject to the following
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restrictions:
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1. This software is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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2. The origin of this software must not be misrepresented, either by
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explicit claim or by omission.
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3. Altered versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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4. If PCRE is embedded in any software that is released under the GNU
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General Purpose Licence (GPL), then the terms of that licence shall
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supersede any condition above with which it is incompatible.
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-----------------------------------------------------------------------------
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*/
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/* This header contains definitions that are shared between the different
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modules, but which are not relevant to the outside. */
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/* Get the definitions provided by running "configure" */
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#include "config.h"
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/* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
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define a macro for memmove() if HAVE_MEMMOVE is false, provided that HAVE_BCOPY
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is set. Otherwise, include an emulating function for those systems that have
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neither (there some non-Unix environments where this is the case). This assumes
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that all calls to memmove are moving strings upwards in store, which is the
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case in PCRE. */
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#if ! HAVE_MEMMOVE
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#undef memmove /* some systems may have a macro */
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#if HAVE_BCOPY
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#define memmove(a, b, c) bcopy(b, a, c)
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#else
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void *
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pcre_memmove(unsigned char *dest, const unsigned char *src, size_t n)
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{
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int i;
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dest += n;
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src += n;
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for (i = 0; i < n; ++i) *(--dest) = *(--src);
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}
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#define memmove(a, b, c) pcre_memmove(a, b, c)
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#endif
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#endif
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/* Standard C headers plus the external interface definition */
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#include <ctype.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pcre.h"
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/* In case there is no definition of offsetof() provided - though any proper
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Standard C system should have one. */
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#ifndef offsetof
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#define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))
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#endif
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/* These are the public options that can change during matching. */
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#define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
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/* Private options flags start at the most significant end of the four bytes,
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but skip the top bit so we can use ints for convenience without getting tangled
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with negative values. The public options defined in pcre.h start at the least
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significant end. Make sure they don't overlap, though now that we have expanded
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to four bytes there is plenty of space. */
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#define PCRE_FIRSTSET 0x40000000 /* first_char is set */
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#define PCRE_REQCHSET 0x20000000 /* req_char is set */
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#define PCRE_STARTLINE 0x10000000 /* start after \n for multiline */
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#define PCRE_INGROUP 0x08000000 /* compiling inside a group */
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#define PCRE_ICHANGED 0x04000000 /* i option changes within regex */
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/* Options for the "extra" block produced by pcre_study(). */
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#define PCRE_STUDY_MAPPED 0x01 /* a map of starting chars exists */
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/* Masks for identifying the public options which are permitted at compile
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time, run time or study time, respectively. */
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#define PUBLIC_OPTIONS \
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(PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \
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PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY|PCRE_UTF8)
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#define PUBLIC_EXEC_OPTIONS \
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(PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY)
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#define PUBLIC_STUDY_OPTIONS 0 /* None defined */
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/* Magic number to provide a small check against being handed junk. */
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#define MAGIC_NUMBER 0x50435245UL /* 'PCRE' */
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/* Miscellaneous definitions */
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typedef int BOOL;
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#define FALSE 0
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#define TRUE 1
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/* These are escaped items that aren't just an encoding of a particular data
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value such as \n. They must have non-zero values, as check_escape() returns
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their negation. Also, they must appear in the same order as in the opcode
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definitions below, up to ESC_z. The final one must be ESC_REF as subsequent
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values are used for \1, \2, \3, etc. There is a test in the code for an escape
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greater than ESC_b and less than ESC_X to detect the types that may be
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repeated. If any new escapes are put in-between that don't consume a character,
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that code will have to change. */
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enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,
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ESC_Z, ESC_z, ESC_REF };
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/* Opcode table: OP_BRA must be last, as all values >= it are used for brackets
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that extract substrings. Starting from 1 (i.e. after OP_END), the values up to
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OP_EOD must correspond in order to the list of escapes immediately above. */
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enum {
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OP_END, /* End of pattern */
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/* Values corresponding to backslashed metacharacters */
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OP_SOD, /* Start of data: \A */
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OP_NOT_WORD_BOUNDARY, /* \B */
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OP_WORD_BOUNDARY, /* \b */
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OP_NOT_DIGIT, /* \D */
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OP_DIGIT, /* \d */
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OP_NOT_WHITESPACE, /* \S */
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OP_WHITESPACE, /* \s */
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OP_NOT_WORDCHAR, /* \W */
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OP_WORDCHAR, /* \w */
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OP_EODN, /* End of data or \n at end of data: \Z. */
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OP_EOD, /* End of data: \z */
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OP_OPT, /* Set runtime options */
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OP_CIRC, /* Start of line - varies with multiline switch */
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OP_DOLL, /* End of line - varies with multiline switch */
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OP_ANY, /* Match any character */
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OP_CHARS, /* Match string of characters */
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OP_NOT, /* Match anything but the following char */
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OP_STAR, /* The maximizing and minimizing versions of */
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OP_MINSTAR, /* all these opcodes must come in pairs, with */
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OP_PLUS, /* the minimizing one second. */
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OP_MINPLUS, /* This first set applies to single characters */
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OP_QUERY,
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OP_MINQUERY,
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OP_UPTO, /* From 0 to n matches */
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OP_MINUPTO,
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OP_EXACT, /* Exactly n matches */
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OP_NOTSTAR, /* The maximizing and minimizing versions of */
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OP_NOTMINSTAR, /* all these opcodes must come in pairs, with */
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OP_NOTPLUS, /* the minimizing one second. */
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OP_NOTMINPLUS, /* This first set applies to "not" single characters */
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OP_NOTQUERY,
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OP_NOTMINQUERY,
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OP_NOTUPTO, /* From 0 to n matches */
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OP_NOTMINUPTO,
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OP_NOTEXACT, /* Exactly n matches */
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OP_TYPESTAR, /* The maximizing and minimizing versions of */
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OP_TYPEMINSTAR, /* all these opcodes must come in pairs, with */
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OP_TYPEPLUS, /* the minimizing one second. These codes must */
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OP_TYPEMINPLUS, /* be in exactly the same order as those above. */
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OP_TYPEQUERY, /* This set applies to character types such as \d */
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OP_TYPEMINQUERY,
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OP_TYPEUPTO, /* From 0 to n matches */
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OP_TYPEMINUPTO,
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OP_TYPEEXACT, /* Exactly n matches */
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OP_CRSTAR, /* The maximizing and minimizing versions of */
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OP_CRMINSTAR, /* all these opcodes must come in pairs, with */
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OP_CRPLUS, /* the minimizing one second. These codes must */
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OP_CRMINPLUS, /* be in exactly the same order as those above. */
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OP_CRQUERY, /* These are for character classes and back refs */
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OP_CRMINQUERY,
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OP_CRRANGE, /* These are different to the three seta above. */
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OP_CRMINRANGE,
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OP_CLASS, /* Match a character class */
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OP_REF, /* Match a back reference */
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OP_RECURSE, /* Match this pattern recursively */
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OP_ALT, /* Start of alternation */
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OP_KET, /* End of group that doesn't have an unbounded repeat */
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OP_KETRMAX, /* These two must remain together and in this */
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OP_KETRMIN, /* order. They are for groups the repeat for ever. */
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/* The assertions must come before ONCE and COND */
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OP_ASSERT, /* Positive lookahead */
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OP_ASSERT_NOT, /* Negative lookahead */
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OP_ASSERTBACK, /* Positive lookbehind */
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OP_ASSERTBACK_NOT, /* Negative lookbehind */
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OP_REVERSE, /* Move pointer back - used in lookbehind assertions */
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/* ONCE and COND must come after the assertions, with ONCE first, as there's
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a test for >= ONCE for a subpattern that isn't an assertion. */
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OP_ONCE, /* Once matched, don't back up into the subpattern */
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OP_COND, /* Conditional group */
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OP_CREF, /* Used to hold an extraction string number */
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OP_BRAZERO, /* These two must remain together and in this */
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OP_BRAMINZERO, /* order. */
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OP_BRA /* This and greater values are used for brackets that
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extract substrings. */
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};
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/* The highest extraction number. This is limited by the number of opcodes
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left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */
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#define EXTRACT_MAX 99
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/* The texts of compile-time error messages are defined as macros here so that
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they can be accessed by the POSIX wrapper and converted into error codes. Yes,
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I could have used error codes in the first place, but didn't feel like changing
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just to accommodate the POSIX wrapper. */
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#define ERR1 "\\ at end of pattern"
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#define ERR2 "\\c at end of pattern"
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#define ERR3 "unrecognized character follows \\"
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#define ERR4 "numbers out of order in {} quantifier"
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#define ERR5 "number too big in {} quantifier"
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#define ERR6 "missing terminating ] for character class"
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#define ERR7 "invalid escape sequence in character class"
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#define ERR8 "range out of order in character class"
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#define ERR9 "nothing to repeat"
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#define ERR10 "operand of unlimited repeat could match the empty string"
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#define ERR11 "internal error: unexpected repeat"
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#define ERR12 "unrecognized character after (?"
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#define ERR13 "too many capturing parenthesized sub-patterns"
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#define ERR14 "missing )"
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#define ERR15 "back reference to non-existent subpattern"
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#define ERR16 "erroffset passed as NULL"
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#define ERR17 "unknown option bit(s) set"
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#define ERR18 "missing ) after comment"
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#define ERR19 "too many sets of parentheses"
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#define ERR20 "regular expression too large"
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#define ERR21 "failed to get memory"
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#define ERR22 "unmatched parentheses"
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#define ERR23 "internal error: code overflow"
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#define ERR24 "unrecognized character after (?<"
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#define ERR25 "lookbehind assertion is not fixed length"
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#define ERR26 "malformed number after (?("
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#define ERR27 "conditional group contains more than two branches"
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#define ERR28 "assertion expected after (?("
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#define ERR29 "(?p must be followed by )"
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#define ERR30 "unknown POSIX class name"
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#define ERR31 "POSIX collating elements are not supported"
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#define ERR32 "this version of PCRE is not compiled with PCRE_UTF8 support"
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#define ERR33 "characters with values > 255 are not yet supported in classes"
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#define ERR34 "character value in \\x{...} sequence is too large"
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#define ERR35 "invalid condition (?(0)"
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/* All character handling must be done as unsigned characters. Otherwise there
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are problems with top-bit-set characters and functions such as isspace().
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However, we leave the interface to the outside world as char *, because that
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should make things easier for callers. We define a short type for unsigned char
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to save lots of typing. I tried "uchar", but it causes problems on Digital
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Unix, where it is defined in sys/types, so use "uschar" instead. */
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typedef unsigned char uschar;
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/* The real format of the start of the pcre block; the actual code vector
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runs on as long as necessary after the end. */
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typedef struct real_pcre {
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unsigned long int magic_number;
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size_t size;
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const unsigned char *tables;
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unsigned long int options;
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uschar top_bracket;
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uschar top_backref;
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uschar first_char;
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uschar req_char;
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uschar code[1];
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} real_pcre;
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/* The real format of the extra block returned by pcre_study(). */
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typedef struct real_pcre_extra {
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uschar options;
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uschar start_bits[32];
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} real_pcre_extra;
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/* Structure for passing "static" information around between the functions
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doing the compiling, so that they are thread-safe. */
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typedef struct compile_data {
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const uschar *lcc; /* Points to lower casing table */
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const uschar *fcc; /* Points to case-flipping table */
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const uschar *cbits; /* Points to character type table */
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const uschar *ctypes; /* Points to table of type maps */
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} compile_data;
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/* Structure for passing "static" information around between the functions
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doing the matching, so that they are thread-safe. */
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typedef struct match_data {
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int errorcode; /* As it says */
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int *offset_vector; /* Offset vector */
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int offset_end; /* One past the end */
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int offset_max; /* The maximum usable for return data */
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const uschar *lcc; /* Points to lower casing table */
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const uschar *ctypes; /* Points to table of type maps */
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BOOL offset_overflow; /* Set if too many extractions */
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BOOL notbol; /* NOTBOL flag */
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BOOL noteol; /* NOTEOL flag */
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BOOL utf8; /* UTF8 flag */
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BOOL endonly; /* Dollar not before final \n */
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BOOL notempty; /* Empty string match not wanted */
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const uschar *start_pattern; /* For use when recursing */
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const uschar *start_subject; /* Start of the subject string */
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const uschar *end_subject; /* End of the subject string */
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const uschar *start_match; /* Start of this match attempt */
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const uschar *end_match_ptr; /* Subject position at end match */
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int end_offset_top; /* Highwater mark at end of match */
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|
|
} match_data;
|
||
|
|
|
||
|
|
/* Bit definitions for entries in the pcre_ctypes table. */
|
||
|
|
|
||
|
|
#define ctype_space 0x01
|
||
|
|
#define ctype_letter 0x02
|
||
|
|
#define ctype_digit 0x04
|
||
|
|
#define ctype_xdigit 0x08
|
||
|
|
#define ctype_word 0x10 /* alphameric or '_' */
|
||
|
|
#define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */
|
||
|
|
|
||
|
|
/* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
|
||
|
|
of bits for a class map. Some classes are built by combining these tables. */
|
||
|
|
|
||
|
|
#define cbit_space 0 /* [:space:] or \s */
|
||
|
|
#define cbit_xdigit 32 /* [:xdigit:] */
|
||
|
|
#define cbit_digit 64 /* [:digit:] or \d */
|
||
|
|
#define cbit_upper 96 /* [:upper:] */
|
||
|
|
#define cbit_lower 128 /* [:lower:] */
|
||
|
|
#define cbit_word 160 /* [:word:] or \w */
|
||
|
|
#define cbit_graph 192 /* [:graph:] */
|
||
|
|
#define cbit_print 224 /* [:print:] */
|
||
|
|
#define cbit_punct 256 /* [:punct:] */
|
||
|
|
#define cbit_cntrl 288 /* [:cntrl:] */
|
||
|
|
#define cbit_length 320 /* Length of the cbits table */
|
||
|
|
|
||
|
|
/* Offsets of the various tables from the base tables pointer, and
|
||
|
|
total length. */
|
||
|
|
|
||
|
|
#define lcc_offset 0
|
||
|
|
#define fcc_offset 256
|
||
|
|
#define cbits_offset 512
|
||
|
|
#define ctypes_offset (cbits_offset + cbit_length)
|
||
|
|
#define tables_length (ctypes_offset + 256)
|
||
|
|
|
||
|
|
/* End of internal.h */
|