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303 lines
12 KiB
303 lines
12 KiB
/************************************************* |
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* Perl-Compatible Regular Expressions * |
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*************************************************/ |
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#define PCRE_VERSION "1.09 28-Apr-1998" |
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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) 1998 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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----------------------------------------------------------------------------- |
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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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/* To cope with SunOS4 and other systems that lack memmove() but have bcopy(), |
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define a macro for memmove() if USE_BCOPY is defined. */ |
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#ifdef USE_BCOPY |
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#undef memmove /* some systems may have a macro */ |
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#define memmove(a, b, c) bcopy(b, a, c) |
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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 <setjmp.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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/* Private options flags start at the most significant end of the two bytes. |
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The public options defined in pcre.h start at the least significant end. Make |
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sure they don't overlap! */ |
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#define PCRE_FIRSTSET 0x8000 /* first_char is set */ |
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#define PCRE_STARTLINE 0x4000 /* start after \n for multiline */ |
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#define PCRE_COMPILED_CASELESS 0x2000 /* like it says */ |
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/* Options for the "extra" block produced by pcre_study(). */ |
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#define PCRE_STUDY_CASELESS 0x01 /* study was caseless */ |
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#define PCRE_STUDY_MAPPED 0x02 /* a map of starting chars exists */ |
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/* Masks for identifying the public options: all permitted at compile time, |
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only some permitted at run or study time. */ |
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#ifdef FOR_PYTHON |
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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| \ |
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PCRE_LOCALE) |
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#else |
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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) |
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#endif |
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#define PUBLIC_EXEC_OPTIONS \ |
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(PCRE_CASELESS|PCRE_ANCHORED|PCRE_MULTILINE|PCRE_NOTBOL|PCRE_NOTEOL| \ |
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PCRE_DOTALL|PCRE_DOLLAR_ENDONLY) |
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#define PUBLIC_STUDY_OPTIONS (PCRE_CASELESS) |
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/* Magic number to provide a small check against being handed junk. */ |
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#define MAGIC_NUMBER 0x50435245 /* '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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/* These are not Perl escapes, so can't appear in the */ |
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ESC_X, /* simple table-lookup because they must be conditional */ |
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/* on PCRE_EXTRA. */ |
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ESC_Z, |
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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_CUT, /* The analogue of Prolog's "cut" operation (extension) */ |
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OP_EOD, /* End of data: \Z. */ |
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OP_NOT_WORD_BOUNDARY_L, /* localized \B */ |
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OP_WORD_BOUNDARY_L, /* localized \b */ |
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OP_NOT_WORDCHAR_L, /* localized \W */ |
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OP_WORDCHAR_L, /* localized \w */ |
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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_NEGCLASS, /* Match a character class, specified negatively */ |
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OP_CLASS_L, /* Match a character class */ |
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OP_REF, /* Match a back reference */ |
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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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OP_ASSERT, |
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OP_ASSERT_NOT, |
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OP_ONCE, /* Once matched, don't back up into the subpattern */ |
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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 brackets" |
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#define ERR23 "internal error: code overflow" |
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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 int magic_number; |
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unsigned short int options; |
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unsigned char top_bracket; |
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unsigned char top_backref; |
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unsigned char first_char; |
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unsigned char 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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unsigned char options; |
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unsigned char start_bits[32]; |
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} real_pcre_extra; |
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/* Global tables from chartables.c */ |
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extern uschar pcre_lcc[]; |
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extern uschar pcre_fcc[]; |
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extern uschar pcre_cbits[]; |
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extern uschar pcre_ctypes[]; |
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/* Bit definitions for entries in pcre_ctypes[]. */ |
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#define ctype_space 0x01 |
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#define ctype_letter 0x02 |
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#define ctype_digit 0x04 |
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#define ctype_xdigit 0x08 |
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#define ctype_word 0x10 /* alphameric or '_' */ |
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#define ctype_odigit 0x20 /* octal digit */ |
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#define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */ |
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/* Offsets for the bitmap tables */ |
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#define cbit_digit 0 |
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#define cbit_letter 32 |
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#define cbit_word 64 |
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#define cbit_space 96 |
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#define cbit_length 128 /* Length of the cbits table */ |
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/* End of internal.h */
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