/[pcre]/code/tags/pcre-3.9/internal.h
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revision 13 by nigel, Sat Feb 24 21:38:21 2007 UTC revision 53 by nigel, Sat Feb 24 21:39:42 2007 UTC
# Line 3  Line 3 
3  *************************************************/  *************************************************/
4    
5    
 #define PCRE_VERSION       "1.05 23-Dec-1997"  
   
   
6  /* This is a library of functions to support regular expressions whose syntax  /* This is a library of functions to support regular expressions whose syntax
7  and semantics are as close as possible to those of the Perl 5 language. See  and semantics are as close as possible to those of the Perl 5 language. See
8  the file Tech.Notes for some information on the internals.  the file Tech.Notes for some information on the internals.
9    
10  Written by: Philip Hazel <ph10@cam.ac.uk>  Written by: Philip Hazel <ph10@cam.ac.uk>
11    
12             Copyright (c) 1997 University of Cambridge             Copyright (c) 1997-2001 University of Cambridge
13    
14  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
15  Permission is granted to anyone to use this software for any purpose on any  Permission is granted to anyone to use this software for any purpose on any
# Line 28  restrictions: Line 25  restrictions:
25    
26  3. Altered versions must be plainly marked as such, and must not be  3. Altered versions must be plainly marked as such, and must not be
27     misrepresented as being the original software.     misrepresented as being the original software.
28    
29    4. If PCRE is embedded in any software that is released under the GNU
30       General Purpose Licence (GPL), then the terms of that licence shall
31       supersede any condition above with which it is incompatible.
32  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
33  */  */
34    
35  /* This header contains definitions that are shared between the different  /* This header contains definitions that are shared between the different
36  modules, but which are not relevant to the outside. */  modules, but which are not relevant to the outside. */
37    
38    /* Get the definitions provided by running "configure" */
39    
40    #include "config.h"
41    
42  /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),  /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
43  define a macro for memmove() if USE_BCOPY is defined. */  define a macro for memmove() if HAVE_MEMMOVE is false, provided that HAVE_BCOPY
44    is set. Otherwise, include an emulating function for those systems that have
45    neither (there some non-Unix environments where this is the case). This assumes
46    that all calls to memmove are moving strings upwards in store, which is the
47    case in PCRE. */
48    
49  #ifdef USE_BCOPY  #if ! HAVE_MEMMOVE
50  #undef  memmove        /* some systems may have a macro */  #undef  memmove        /* some systems may have a macro */
51    #if HAVE_BCOPY
52  #define memmove(a, b, c) bcopy(b, a, c)  #define memmove(a, b, c) bcopy(b, a, c)
53    #else
54    void *
55    pcre_memmove(unsigned char *dest, const unsigned char *src, size_t n)
56    {
57    int i;
58    dest += n;
59    src += n;
60    for (i = 0; i < n; ++i) *(--dest) =  *(--src);
61    }
62    #define memmove(a, b, c) pcre_memmove(a, b, c)
63    #endif
64  #endif  #endif
65    
66  /* Standard C headers plus the external interface definition */  /* Standard C headers plus the external interface definition */
67    
68  #include <ctype.h>  #include <ctype.h>
69  #include <limits.h>  #include <limits.h>
 #include <setjmp.h>  
70  #include <stddef.h>  #include <stddef.h>
71  #include <stdio.h>  #include <stdio.h>
72  #include <stdlib.h>  #include <stdlib.h>
# Line 60  Standard C system should have one. */ Line 80  Standard C system should have one. */
80  #define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))  #define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))
81  #endif  #endif
82    
83  /* Private options flags start at the most significant end of the two bytes.  /* These are the public options that can change during matching. */
84  The public options defined in pcre.h start at the least significant end. Make  
85  sure they don't overlap! */  #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
86    
87  #define PCRE_FIRSTSET           0x8000  /* first_char is set */  /* Private options flags start at the most significant end of the four bytes,
88  #define PCRE_STARTLINE          0x4000  /* start after \n for multiline */  but skip the top bit so we can use ints for convenience without getting tangled
89  #define PCRE_COMPILED_CASELESS  0x2000  /* like it says */  with negative values. The public options defined in pcre.h start at the least
90    significant end. Make sure they don't overlap, though now that we have expanded
91    to four bytes there is plenty of space. */
92    
93    #define PCRE_FIRSTSET      0x40000000  /* first_char is set */
94    #define PCRE_REQCHSET      0x20000000  /* req_char is set */
95    #define PCRE_STARTLINE     0x10000000  /* start after \n for multiline */
96    #define PCRE_INGROUP       0x08000000  /* compiling inside a group */
97    #define PCRE_ICHANGED      0x04000000  /* i option changes within regex */
98    
99  /* Options for the "extra" block produced by pcre_study(). */  /* Options for the "extra" block produced by pcre_study(). */
100    
101  #define PCRE_STUDY_CASELESS 0x01     /* study was caseless */  #define PCRE_STUDY_MAPPED   0x01     /* a map of starting chars exists */
 #define PCRE_STUDY_MAPPED   0x02     /* a map of starting chars exists */  
102    
103  /* Masks for identifying the public options: all permitted at compile time,  /* Masks for identifying the public options which are permitted at compile
104  only some permitted at run or study time. */  time, run time or study time, respectively. */
105    
106  #define PUBLIC_OPTIONS \  #define PUBLIC_OPTIONS \
107    (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \    (PCRE_CASELESS|PCRE_EXTENDED|PCRE_ANCHORED|PCRE_MULTILINE| \
108     PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA)     PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY|PCRE_UTF8)
109    
110  #define PUBLIC_EXEC_OPTIONS \  #define PUBLIC_EXEC_OPTIONS \
111    (PCRE_CASELESS|PCRE_ANCHORED|PCRE_MULTILINE|PCRE_NOTBOL|PCRE_NOTEOL| \    (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY)
    PCRE_DOTALL|PCRE_DOLLAR_ENDONLY)  
112    
113  #define PUBLIC_STUDY_OPTIONS (PCRE_CASELESS)  #define PUBLIC_STUDY_OPTIONS 0   /* None defined */
114    
115  /* Magic number to provide a small check against being handed junk. */  /* Magic number to provide a small check against being handed junk. */
116    
117  #define MAGIC_NUMBER  0x50435245   /* 'PCRE' */  #define MAGIC_NUMBER  0x50435245UL   /* 'PCRE' */
118    
119  /* Miscellaneous definitions */  /* Miscellaneous definitions */
120    
# Line 97  typedef int BOOL; Line 123  typedef int BOOL;
123  #define FALSE   0  #define FALSE   0
124  #define TRUE    1  #define TRUE    1
125    
126    /* Escape items that are just an encoding of a particular data value. Note that
127    ESC_N is defined as yet another macro, which is set in config.h to either \n
128    (the default) or \r (which some people want). */
129    
130    #ifndef ESC_E
131    #define ESC_E 27
132    #endif
133    
134    #ifndef ESC_F
135    #define ESC_F '\f'
136    #endif
137    
138    #ifndef ESC_N
139    #define ESC_N NEWLINE
140    #endif
141    
142    #ifndef ESC_R
143    #define ESC_R '\r'
144    #endif
145    
146    #ifndef ESC_T
147    #define ESC_T '\t'
148    #endif
149    
150  /* These are escaped items that aren't just an encoding of a particular data  /* These are escaped items that aren't just an encoding of a particular data
151  value such as \n. They must have non-zero values, as check_escape() returns  value such as \n. They must have non-zero values, as check_escape() returns
152  their negation. Also, they must appear in the same order as in the opcode  their negation. Also, they must appear in the same order as in the opcode
153  definitions below, up to ESC_Z. The final one must be ESC_REF as subsequent  definitions below, up to ESC_z. The final one must be ESC_REF as subsequent
154  values are used for \1, \2, \3, etc. There is a test in the code for an escape  values are used for \1, \2, \3, etc. There is a test in the code for an escape
155  greater than ESC_b and less than ESC_X to detect the types that may be  greater than ESC_b and less than ESC_Z to detect the types that may be
156  repeated. If any new escapes are put in-between that don't consume a character,  repeated. If any new escapes are put in-between that don't consume a character,
157  that code will have to change. */  that code will have to change. */
158    
159  enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,  enum { ESC_A = 1, ESC_B, ESC_b, ESC_D, ESC_d, ESC_S, ESC_s, ESC_W, ESC_w,
160           ESC_Z, ESC_z, ESC_REF };
                     /* These are not Perl escapes, so can't appear in the */  
        ESC_X,       /* simple table-lookup because they must be conditional */  
                     /* on PCRE_EXTRA. */  
        ESC_Z,  
        ESC_REF };  
161    
162  /* Opcode table: OP_BRA must be last, as all values >= it are used for brackets  /* Opcode table: OP_BRA must be last, as all values >= it are used for brackets
163  that extract substrings. Starting from 1 (i.e. after OP_END), the values up to  that extract substrings. Starting from 1 (i.e. after OP_END), the values up to
# Line 132  enum { Line 177  enum {
177    OP_WHITESPACE,         /* \s */    OP_WHITESPACE,         /* \s */
178    OP_NOT_WORDCHAR,       /* \W */    OP_NOT_WORDCHAR,       /* \W */
179    OP_WORDCHAR,           /* \w */    OP_WORDCHAR,           /* \w */
180    OP_CUT,            /* The analogue of Prolog's "cut" operation (extension) */    OP_EODN,           /* End of data or \n at end of data: \Z. */
181    OP_EOD,            /* End of data: \Z. */    OP_EOD,            /* End of data: \z */
182    
183      OP_OPT,            /* Set runtime options */
184    OP_CIRC,           /* Start of line - varies with multiline switch */    OP_CIRC,           /* Start of line - varies with multiline switch */
185    OP_DOLL,           /* End of line - varies with multiline switch */    OP_DOLL,           /* End of line - varies with multiline switch */
186    OP_ANY,            /* Match any character */    OP_ANY,            /* Match any character */
# Line 181  enum { Line 227  enum {
227    OP_CRMINRANGE,    OP_CRMINRANGE,
228    
229    OP_CLASS,          /* Match a character class */    OP_CLASS,          /* Match a character class */
   OP_NEGCLASS,       /* Match a character class, specified negatively */  
230    OP_REF,            /* Match a back reference */    OP_REF,            /* Match a back reference */
231      OP_RECURSE,        /* Match this pattern recursively */
232    
233    OP_ALT,            /* Start of alternation */    OP_ALT,            /* Start of alternation */
234    OP_KET,            /* End of group that doesn't have an unbounded repeat */    OP_KET,            /* End of group that doesn't have an unbounded repeat */
235    OP_KETRMAX,        /* These two must remain together and in this */    OP_KETRMAX,        /* These two must remain together and in this */
236    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */
237    
238    OP_ASSERT,    /* The assertions must come before ONCE and COND */
239    OP_ASSERT_NOT,  
240      OP_ASSERT,         /* Positive lookahead */
241      OP_ASSERT_NOT,     /* Negative lookahead */
242      OP_ASSERTBACK,     /* Positive lookbehind */
243      OP_ASSERTBACK_NOT, /* Negative lookbehind */
244      OP_REVERSE,        /* Move pointer back - used in lookbehind assertions */
245    
246      /* ONCE and COND must come after the assertions, with ONCE first, as there's
247      a test for >= ONCE for a subpattern that isn't an assertion. */
248    
249    OP_ONCE,           /* Once matched, don't back up into the subpattern */    OP_ONCE,           /* Once matched, don't back up into the subpattern */
250      OP_COND,           /* Conditional group */
251      OP_CREF,           /* Used to hold an extraction string number (cond ref) */
252    
253    OP_BRAZERO,        /* These two must remain together and in this */    OP_BRAZERO,        /* These two must remain together and in this */
254    OP_BRAMINZERO,     /* order. */    OP_BRAMINZERO,     /* order. */
255    
256      OP_BRANUMBER,      /* Used for extracting brackets whose number is greater
257                            than can fit into an opcode. */
258    
259    OP_BRA             /* This and greater values are used for brackets that    OP_BRA             /* This and greater values are used for brackets that
260                          extract substrings. */                          extract substrings up to a basic limit. After that,
261                            use is made of OP_BRANUMBER. */
262  };  };
263    
264  /* The highest extraction number. This is limited by the number of opcodes  /* The highest extraction number before we have to start using additional
265  left after OP_BRA, i.e. 255 - OP_BRA. We actually set it somewhat lower. */  bytes. (Originally PCRE didn't have support for extraction counts highter than
266    this number.) The value is limited by the number of opcodes left after OP_BRA,
267    i.e. 255 - OP_BRA. We actually set it a bit lower to leave room for additional
268    opcodes. */
269    
270  #define EXTRACT_MAX  99  #define EXTRACT_BASIC_MAX  150
271    
272  /* The texts of compile-time error messages are defined as macros here so that  /* The texts of compile-time error messages are defined as macros here so that
273  they can be accessed by the POSIX wrapper and converted into error codes.  Yes,  they can be accessed by the POSIX wrapper and converted into error codes.  Yes,
# Line 222  just to accommodate the POSIX wrapper. * Line 286  just to accommodate the POSIX wrapper. *
286  #define ERR10 "operand of unlimited repeat could match the empty string"  #define ERR10 "operand of unlimited repeat could match the empty string"
287  #define ERR11 "internal error: unexpected repeat"  #define ERR11 "internal error: unexpected repeat"
288  #define ERR12 "unrecognized character after (?"  #define ERR12 "unrecognized character after (?"
289  #define ERR13 "too many capturing parenthesized sub-patterns"  #define ERR13 "unused error"
290  #define ERR14 "missing )"  #define ERR14 "missing )"
291  #define ERR15 "back reference to non-existent subpattern"  #define ERR15 "back reference to non-existent subpattern"
292  #define ERR16 "erroffset passed as NULL"  #define ERR16 "erroffset passed as NULL"
293  #define ERR17 "unknown option bit(s) set"  #define ERR17 "unknown option bit(s) set"
294  #define ERR18 "missing ) after comment"  #define ERR18 "missing ) after comment"
295  #define ERR19 "too many sets of parentheses"  #define ERR19 "parentheses nested too deeply"
296  #define ERR20 "regular expression too large"  #define ERR20 "regular expression too large"
297  #define ERR21 "failed to get memory"  #define ERR21 "failed to get memory"
298  #define ERR22 "unmatched brackets"  #define ERR22 "unmatched parentheses"
299  #define ERR23 "internal error: code overflow"  #define ERR23 "internal error: code overflow"
300    #define ERR24 "unrecognized character after (?<"
301    #define ERR25 "lookbehind assertion is not fixed length"
302    #define ERR26 "malformed number after (?("
303    #define ERR27 "conditional group contains more than two branches"
304    #define ERR28 "assertion expected after (?("
305    #define ERR29 "(?p must be followed by )"
306    #define ERR30 "unknown POSIX class name"
307    #define ERR31 "POSIX collating elements are not supported"
308    #define ERR32 "this version of PCRE is not compiled with PCRE_UTF8 support"
309    #define ERR33 "characters with values > 255 are not yet supported in classes"
310    #define ERR34 "character value in \\x{...} sequence is too large"
311    #define ERR35 "invalid condition (?(0)"
312    
313  /* All character handling must be done as unsigned characters. Otherwise there  /* All character handling must be done as unsigned characters. Otherwise there
314  are problems with top-bit-set characters and functions such as isspace().  are problems with top-bit-set characters and functions such as isspace().
# Line 247  typedef unsigned char uschar; Line 323  typedef unsigned char uschar;
323  runs on as long as necessary after the end. */  runs on as long as necessary after the end. */
324    
325  typedef struct real_pcre {  typedef struct real_pcre {
326    unsigned int  magic_number;    unsigned long int magic_number;
327    unsigned short int options;    size_t size;
328    unsigned char top_bracket;    const unsigned char *tables;
329    unsigned char top_backref;    unsigned long int options;
330    unsigned char first_char;    unsigned short int top_bracket;
331    unsigned char code[1];    unsigned short int top_backref;
332      uschar first_char;
333      uschar req_char;
334      uschar code[1];
335  } real_pcre;  } real_pcre;
336    
337  /* The real format of the extra block returned by pcre_study(). */  /* The real format of the extra block returned by pcre_study(). */
338    
339  typedef struct real_pcre_extra {  typedef struct real_pcre_extra {
340    unsigned char options;    uschar options;
341    unsigned char start_bits[32];    uschar start_bits[32];
342  } real_pcre_extra;  } real_pcre_extra;
343    
 /* Global tables from chartables.c */  
344    
345  extern uschar pcre_lcc[];  /* Structure for passing "static" information around between the functions
346  extern uschar pcre_fcc[];  doing the compiling, so that they are thread-safe. */
347  extern uschar pcre_cbits[];  
348  extern uschar pcre_ctypes[];  typedef struct compile_data {
349      const uschar *lcc;            /* Points to lower casing table */
350      const uschar *fcc;            /* Points to case-flipping table */
351      const uschar *cbits;          /* Points to character type table */
352      const uschar *ctypes;         /* Points to table of type maps */
353    } compile_data;
354    
355    /* Structure for passing "static" information around between the functions
356    doing the matching, so that they are thread-safe. */
357    
358    typedef struct match_data {
359      int    errorcode;             /* As it says */
360      int   *offset_vector;         /* Offset vector */
361      int    offset_end;            /* One past the end */
362      int    offset_max;            /* The maximum usable for return data */
363      const uschar *lcc;            /* Points to lower casing table */
364      const uschar *ctypes;         /* Points to table of type maps */
365      BOOL   offset_overflow;       /* Set if too many extractions */
366      BOOL   notbol;                /* NOTBOL flag */
367      BOOL   noteol;                /* NOTEOL flag */
368      BOOL   utf8;                  /* UTF8 flag */
369      BOOL   endonly;               /* Dollar not before final \n */
370      BOOL   notempty;              /* Empty string match not wanted */
371      const uschar *start_pattern;  /* For use when recursing */
372      const uschar *start_subject;  /* Start of the subject string */
373      const uschar *end_subject;    /* End of the subject string */
374      const uschar *start_match;    /* Start of this match attempt */
375      const uschar *end_match_ptr;  /* Subject position at end match */
376      int    end_offset_top;        /* Highwater mark at end of match */
377    } match_data;
378    
379  /* Bit definitions for entries in pcre_ctypes[]. */  /* Bit definitions for entries in the pcre_ctypes table. */
380    
381  #define ctype_space   0x01  #define ctype_space   0x01
382  #define ctype_letter  0x02  #define ctype_letter  0x02
# Line 278  extern uschar pcre_ctypes[]; Line 385  extern uschar pcre_ctypes[];
385  #define ctype_word    0x10   /* alphameric or '_' */  #define ctype_word    0x10   /* alphameric or '_' */
386  #define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */  #define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */
387    
388  /* Offsets for the bitmap tables */  /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
389    of bits for a class map. Some classes are built by combining these tables. */
390    
391  #define cbit_digit    0  #define cbit_space     0      /* [:space:] or \s */
392  #define cbit_letter  32  #define cbit_xdigit   32      /* [:xdigit:] */
393  #define cbit_word    64  #define cbit_digit    64      /* [:digit:] or \d */
394  #define cbit_space   96  #define cbit_upper    96      /* [:upper:] */
395  #define cbit_length 128      /* Length of the cbits table */  #define cbit_lower   128      /* [:lower:] */
396    #define cbit_word    160      /* [:word:] or \w */
397    #define cbit_graph   192      /* [:graph:] */
398    #define cbit_print   224      /* [:print:] */
399    #define cbit_punct   256      /* [:punct:] */
400    #define cbit_cntrl   288      /* [:cntrl:] */
401    #define cbit_length  320      /* Length of the cbits table */
402    
403    /* Offsets of the various tables from the base tables pointer, and
404    total length. */
405    
406    #define lcc_offset      0
407    #define fcc_offset    256
408    #define cbits_offset  512
409    #define ctypes_offset (cbits_offset + cbit_length)
410    #define tables_length (ctypes_offset + 256)
411    
412  /* End of internal.h */  /* End of internal.h */

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