code/trunk/internal.h

/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/


#define PCRE_VERSION       "2.01 21-Oct-1998"


/* This is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language. See
the file Tech.Notes for some information on the internals.

Written by: Philip Hazel <ph10@cam.ac.uk>

           Copyright (c) 1998 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.
-----------------------------------------------------------------------------
*/

/* This header contains definitions that are shared between the different
modules, but which are not relevant to the outside. */

/* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
define a macro for memmove() if USE_BCOPY is defined. */

#ifdef USE_BCOPY
#undef  memmove        /* some systems may have a macro */
#define memmove(a, b, c) bcopy(b, a, c)
#endif

/* Standard C headers plus the external interface definition */

#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#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 two bytes.
The public options defined in pcre.h start at the least significant end. Make
sure they don't overlap! */

#define PCRE_FIRSTSET           0x8000  /* first_char is set */
#define PCRE_STARTLINE          0x4000  /* start after \n for multiline */
#define PCRE_INGROUP            0x2000  /* compiling inside a group */

/* 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)

#define PUBLIC_EXEC_OPTIONS (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL)

#define PUBLIC_STUDY_OPTIONS 0   /* None defined */

/* Magic number to provide a small check against being handed junk. */

#define MAGIC_NUMBER  0x50435245   /* '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_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 (?("

/* 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 int  magic_number;
  const unsigned char *tables;
  unsigned short int options;
  unsigned char top_bracket;
  unsigned char top_backref;
  unsigned char first_char;
  unsigned char code[1];
} real_pcre;

/* The real format of the extra block returned by pcre_study(). */

typedef struct real_pcre_extra {
  unsigned char options;
  unsigned char 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-flippint 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   endonly;               /* Dollar not before final \n */
  const uschar *start_subject;  /* Start of the subject string */
  const uschar *end_subject;    /* End of the subject string */
  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. */

#define cbit_digit    0      /* for \d */
#define cbit_word    32      /* for \w */
#define cbit_space   64      /* for \s */
#define cbit_length  96      /* 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 */
1	nigel	3	/*************************************************
2			* Perl-Compatible Regular Expressions *
3			*************************************************/
4
5
6	nigel	25	#define PCRE_VERSION "2.01 21-Oct-1998"
7	nigel	3
8
9			/* This is a library of functions to support regular expressions whose syntax
10			and semantics are as close as possible to those of the Perl 5 language. See
11			the file Tech.Notes for some information on the internals.
12
13			Written by: Philip Hazel <ph10@cam.ac.uk>
14
15	nigel	15	Copyright (c) 1998 University of Cambridge
16	nigel	3
17			-----------------------------------------------------------------------------
18			Permission is granted to anyone to use this software for any purpose on any
19			computer system, and to redistribute it freely, subject to the following
20			restrictions:
21
22			1. This software is distributed in the hope that it will be useful,
23			but WITHOUT ANY WARRANTY; without even the implied warranty of
24			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
25
26			2. The origin of this software must not be misrepresented, either by
27			explicit claim or by omission.
28
29			3. Altered versions must be plainly marked as such, and must not be
30			misrepresented as being the original software.
31			-----------------------------------------------------------------------------
32			*/
33
34			/* This header contains definitions that are shared between the different
35			modules, but which are not relevant to the outside. */
36
37			/* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
38			define a macro for memmove() if USE_BCOPY is defined. */
39
40			#ifdef USE_BCOPY
41	nigel	9	#undef memmove /* some systems may have a macro */
42	nigel	3	#define memmove(a, b, c) bcopy(b, a, c)
43			#endif
44
45			/* Standard C headers plus the external interface definition */
46
47			#include <ctype.h>
48			#include <limits.h>
49			#include <stddef.h>
50			#include <stdio.h>
51			#include <stdlib.h>
52			#include <string.h>
53			#include "pcre.h"
54
55	nigel	9	/* In case there is no definition of offsetof() provided - though any proper
56			Standard C system should have one. */
57
58			#ifndef offsetof
59	nigel	11	#define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))
60	nigel	9	#endif
61
62	nigel	23	/* These are the public options that can change during matching. */
63
64			#define PCRE_IMS (PCRE_CASELESS\|PCRE_MULTILINE\|PCRE_DOTALL)
65
66	nigel	3	/* Private options flags start at the most significant end of the two bytes.
67			The public options defined in pcre.h start at the least significant end. Make
68			sure they don't overlap! */
69
70			#define PCRE_FIRSTSET 0x8000 /* first_char is set */
71			#define PCRE_STARTLINE 0x4000 /* start after \n for multiline */
72	nigel	23	#define PCRE_INGROUP 0x2000 /* compiling inside a group */
73	nigel	3
74			/* Options for the "extra" block produced by pcre_study(). */
75
76	nigel	23	#define PCRE_STUDY_MAPPED 0x01 /* a map of starting chars exists */
77	nigel	3
78	nigel	23	/* Masks for identifying the public options which are permitted at compile
79			time, run time or study time, respectively. */
80	nigel	3
81			#define PUBLIC_OPTIONS \
82			(PCRE_CASELESS\|PCRE_EXTENDED\|PCRE_ANCHORED\|PCRE_MULTILINE\| \
83	nigel	19	PCRE_DOTALL\|PCRE_DOLLAR_ENDONLY\|PCRE_EXTRA\|PCRE_UNGREEDY)
84	nigel	3
85	nigel	23	#define PUBLIC_EXEC_OPTIONS (PCRE_ANCHORED\|PCRE_NOTBOL\|PCRE_NOTEOL)
86	nigel	3
87	nigel	23	#define PUBLIC_STUDY_OPTIONS 0 /* None defined */
88	nigel	3
89			/* Magic number to provide a small check against being handed junk. */
90
91			#define MAGIC_NUMBER 0x50435245 /* 'PCRE' */
92
93			/* Miscellaneous definitions */
94
95			typedef int BOOL;
96
97			#define FALSE 0
98			#define TRUE 1
99
100			/* These are escaped items that aren't just an encoding of a particular data
101			value such as \n. They must have non-zero values, as check_escape() returns
102			their negation. Also, they must appear in the same order as in the opcode
103	nigel	23	definitions below, up to ESC_z. The final one must be ESC_REF as subsequent
104	nigel	3	values are used for \1, \2, \3, etc. There is a test in the code for an escape
105			greater than ESC_b and less than ESC_X to detect the types that may be
106			repeated. If any new escapes are put in-between that don't consume a character,
107			that code will have to change. */
108
109			enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,
110	nigel	23	ESC_Z, ESC_z, ESC_REF };
111	nigel	3
112			/* Opcode table: OP_BRA must be last, as all values >= it are used for brackets
113			that extract substrings. Starting from 1 (i.e. after OP_END), the values up to
114	nigel	7	OP_EOD must correspond in order to the list of escapes immediately above. */
115	nigel	3
116			enum {
117			OP_END, /* End of pattern */
118
119			/* Values corresponding to backslashed metacharacters */
120
121			OP_SOD, /* Start of data: \A */
122			OP_NOT_WORD_BOUNDARY, /* \B */
123			OP_WORD_BOUNDARY, /* \b */
124			OP_NOT_DIGIT, /* \D */
125			OP_DIGIT, /* \d */
126			OP_NOT_WHITESPACE, /* \S */
127			OP_WHITESPACE, /* \s */
128			OP_NOT_WORDCHAR, /* \W */
129			OP_WORDCHAR, /* \w */
130	nigel	23	OP_EODN, /* End of data or \n at end of data: \Z. */
131			OP_EOD, /* End of data: \z */
132	nigel	3
133	nigel	23	OP_OPT, /* Set runtime options */
134	nigel	3	OP_CIRC, /* Start of line - varies with multiline switch */
135			OP_DOLL, /* End of line - varies with multiline switch */
136			OP_ANY, /* Match any character */
137			OP_CHARS, /* Match string of characters */
138			OP_NOT, /* Match anything but the following char */
139
140			OP_STAR, /* The maximizing and minimizing versions of */
141			OP_MINSTAR, /* all these opcodes must come in pairs, with */
142			OP_PLUS, /* the minimizing one second. */
143			OP_MINPLUS, /* This first set applies to single characters */
144			OP_QUERY,
145			OP_MINQUERY,
146			OP_UPTO, /* From 0 to n matches */
147			OP_MINUPTO,
148			OP_EXACT, /* Exactly n matches */
149
150			OP_NOTSTAR, /* The maximizing and minimizing versions of */
151			OP_NOTMINSTAR, /* all these opcodes must come in pairs, with */
152			OP_NOTPLUS, /* the minimizing one second. */
153			OP_NOTMINPLUS, /* This first set applies to "not" single characters */
154			OP_NOTQUERY,
155			OP_NOTMINQUERY,
156			OP_NOTUPTO, /* From 0 to n matches */
157			OP_NOTMINUPTO,
158			OP_NOTEXACT, /* Exactly n matches */
159
160			OP_TYPESTAR, /* The maximizing and minimizing versions of */
161			OP_TYPEMINSTAR, /* all these opcodes must come in pairs, with */
162			OP_TYPEPLUS, /* the minimizing one second. These codes must */
163			OP_TYPEMINPLUS, /* be in exactly the same order as those above. */
164			OP_TYPEQUERY, /* This set applies to character types such as \d */
165			OP_TYPEMINQUERY,
166			OP_TYPEUPTO, /* From 0 to n matches */
167			OP_TYPEMINUPTO,
168			OP_TYPEEXACT, /* Exactly n matches */
169
170			OP_CRSTAR, /* The maximizing and minimizing versions of */
171			OP_CRMINSTAR, /* all these opcodes must come in pairs, with */
172			OP_CRPLUS, /* the minimizing one second. These codes must */
173			OP_CRMINPLUS, /* be in exactly the same order as those above. */
174			OP_CRQUERY, /* These are for character classes and back refs */
175			OP_CRMINQUERY,
176			OP_CRRANGE, /* These are different to the three seta above. */
177			OP_CRMINRANGE,
178
179			OP_CLASS, /* Match a character class */
180			OP_REF, /* Match a back reference */
181
182			OP_ALT, /* Start of alternation */
183			OP_KET, /* End of group that doesn't have an unbounded repeat */
184			OP_KETRMAX, /* These two must remain together and in this */
185			OP_KETRMIN, /* order. They are for groups the repeat for ever. */
186
187	nigel	23	/* The assertions must come before ONCE and COND */
188
189			OP_ASSERT, /* Positive lookahead */
190			OP_ASSERT_NOT, /* Negative lookahead */
191			OP_ASSERTBACK, /* Positive lookbehind */
192			OP_ASSERTBACK_NOT, /* Negative lookbehind */
193			OP_REVERSE, /* Move pointer back - used in lookbehind assertions */
194
195			/* ONCE and COND must come after the assertions, with ONCE first, as there's
196			a test for >= ONCE for a subpattern that isn't an assertion. */
197
198	nigel	3	OP_ONCE, /* Once matched, don't back up into the subpattern */
199	nigel	23	OP_COND, /* Conditional group */
200			OP_CREF, /* Used to hold an extraction string number */
201	nigel	3
202			OP_BRAZERO, /* These two must remain together and in this */
203			OP_BRAMINZERO, /* order. */
204
205			OP_BRA /* This and greater values are used for brackets that
206			extract substrings. */
207			};
208
209			/* The highest extraction number. This is limited by the number of opcodes
210			left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */
211
212			#define EXTRACT_MAX 99
213
214			/* The texts of compile-time error messages are defined as macros here so that
215			they can be accessed by the POSIX wrapper and converted into error codes. Yes,
216			I could have used error codes in the first place, but didn't feel like changing
217			just to accommodate the POSIX wrapper. */
218
219			#define ERR1 "\\ at end of pattern"
220			#define ERR2 "\\c at end of pattern"
221			#define ERR3 "unrecognized character follows \\"
222			#define ERR4 "numbers out of order in {} quantifier"
223			#define ERR5 "number too big in {} quantifier"
224			#define ERR6 "missing terminating ] for character class"
225			#define ERR7 "invalid escape sequence in character class"
226			#define ERR8 "range out of order in character class"
227			#define ERR9 "nothing to repeat"
228			#define ERR10 "operand of unlimited repeat could match the empty string"
229			#define ERR11 "internal error: unexpected repeat"
230			#define ERR12 "unrecognized character after (?"
231			#define ERR13 "too many capturing parenthesized sub-patterns"
232			#define ERR14 "missing )"
233			#define ERR15 "back reference to non-existent subpattern"
234			#define ERR16 "erroffset passed as NULL"
235			#define ERR17 "unknown option bit(s) set"
236			#define ERR18 "missing ) after comment"
237			#define ERR19 "too many sets of parentheses"
238			#define ERR20 "regular expression too large"
239			#define ERR21 "failed to get memory"
240	nigel	23	#define ERR22 "unmatched parentheses"
241	nigel	3	#define ERR23 "internal error: code overflow"
242	nigel	23	#define ERR24 "unrecognized character after (?<"
243			#define ERR25 "lookbehind assertion is not fixed length"
244			#define ERR26 "malformed number after (?("
245			#define ERR27 "conditional group contains more than two branches"
246			#define ERR28 "assertion expected after (?("
247	nigel	3
248			/* All character handling must be done as unsigned characters. Otherwise there
249			are problems with top-bit-set characters and functions such as isspace().
250			However, we leave the interface to the outside world as char *, because that
251			should make things easier for callers. We define a short type for unsigned char
252			to save lots of typing. I tried "uchar", but it causes problems on Digital
253			Unix, where it is defined in sys/types, so use "uschar" instead. */
254
255			typedef unsigned char uschar;
256
257			/* The real format of the start of the pcre block; the actual code vector
258			runs on as long as necessary after the end. */
259
260			typedef struct real_pcre {
261			unsigned int magic_number;
262	nigel	25	const unsigned char *tables;
263	nigel	3	unsigned short int options;
264			unsigned char top_bracket;
265			unsigned char top_backref;
266			unsigned char first_char;
267			unsigned char code[1];
268			} real_pcre;
269
270			/* The real format of the extra block returned by pcre_study(). */
271
272			typedef struct real_pcre_extra {
273			unsigned char options;
274			unsigned char start_bits[32];
275			} real_pcre_extra;
276
277
278	nigel	25	/* Structure for passing "static" information around between the functions
279			doing the compiling, so that they are thread-safe. */
280	nigel	3
281	nigel	25	typedef struct compile_data {
282			const uschar lcc; / Points to lower casing table */
283			const uschar fcc; / Points to case-flippint table */
284			const uschar cbits; / Points to character type table */
285			const uschar ctypes; / Points to table of type maps */
286			} compile_data;
287	nigel	3
288	nigel	25	/* Structure for passing "static" information around between the functions
289			doing the matching, so that they are thread-safe. */
290
291			typedef struct match_data {
292			int errorcode; /* As it says */
293			int offset_vector; / Offset vector */
294			int offset_end; /* One past the end */
295			int offset_max; /* The maximum usable for return data */
296			const uschar lcc; / Points to lower casing table */
297			const uschar ctypes; / Points to table of type maps */
298			BOOL offset_overflow; /* Set if too many extractions */
299			BOOL notbol; /* NOTBOL flag */
300			BOOL noteol; /* NOTEOL flag */
301			BOOL endonly; /* Dollar not before final \n */
302			const uschar start_subject; / Start of the subject string */
303			const uschar end_subject; / End of the subject string */
304			const uschar end_match_ptr; / Subject position at end match */
305			int end_offset_top; /* Highwater mark at end of match */
306			} match_data;
307
308			/* Bit definitions for entries in the pcre_ctypes table. */
309
310	nigel	3	#define ctype_space 0x01
311			#define ctype_letter 0x02
312			#define ctype_digit 0x04
313			#define ctype_xdigit 0x08
314			#define ctype_word 0x10 /* alphameric or '_' */
315			#define ctype_meta 0x80 /* regexp meta char or zero (end pattern) */
316
317	nigel	25	/* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
318			of bits for a class map. */
319	nigel	3
320	nigel	25	#define cbit_digit 0 /* for \d */
321			#define cbit_word 32 /* for \w */
322			#define cbit_space 64 /* for \s */
323			#define cbit_length 96 /* Length of the cbits table */
324	nigel	3
325	nigel	25	/* Offsets of the various tables from the base tables pointer, and
326			total length. */
327
328			#define lcc_offset 0
329			#define fcc_offset 256
330			#define cbits_offset 512
331			#define ctypes_offset (cbits_offset + cbit_length)
332			#define tables_length (ctypes_offset + 256)
333
334	nigel	3	/* End of internal.h */