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