/[pcre]/code/tags/pcre-4.5/internal.h
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revision 29 by nigel, Sat Feb 24 21:38:53 2007 UTC revision 53 by nigel, Sat Feb 24 21:39:42 2007 UTC
# Line 3  Line 3 
3  *************************************************/  *************************************************/
4    
5    
 #define PCRE_VERSION       "2.03 12-Feb-1999"  
   
   
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) 1997-1999 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 38  restrictions: Line 35  restrictions:
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 */
# Line 67  Standard C system should have one. */ Line 84  Standard C system should have one. */
84    
85  #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)  #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
86    
87  /* Private options flags start at the most significant end of the two bytes.  /* Private options flags start at the most significant end of the four bytes,
88  The public options defined in pcre.h start at the least significant end. Make  but skip the top bit so we can use ints for convenience without getting tangled
89  sure they don't overlap! */  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  #define PCRE_FIRSTSET           0x8000  /* first_char is set */  to four bytes there is plenty of space. */
92  #define PCRE_STARTLINE          0x4000  /* start after \n for multiline */  
93  #define PCRE_INGROUP            0x2000  /* compiling inside a group */  #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    
# Line 84  time, run time or study time, respective Line 105  time, run time or study time, respective
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_UNGREEDY)     PCRE_DOTALL|PCRE_DOLLAR_ENDONLY|PCRE_EXTRA|PCRE_UNGREEDY|PCRE_UTF8)
109    
110  #define PUBLIC_EXEC_OPTIONS (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL)  #define PUBLIC_EXEC_OPTIONS \
111      (PCRE_ANCHORED|PCRE_NOTBOL|PCRE_NOTEOL|PCRE_NOTEMPTY)
112    
113  #define PUBLIC_STUDY_OPTIONS 0   /* None defined */  #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 101  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    
# Line 182  enum { Line 228  enum {
228    
229    OP_CLASS,          /* Match a character class */    OP_CLASS,          /* Match a character class */
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 */
# Line 201  enum { Line 248  enum {
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 */    OP_COND,           /* Conditional group */
251    OP_CREF,           /* Used to hold an extraction string number */    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 232  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 parentheses"  #define ERR22 "unmatched parentheses"
# Line 248  just to accommodate the POSIX wrapper. * Line 302  just to accommodate the POSIX wrapper. *
302  #define ERR26 "malformed number after (?("  #define ERR26 "malformed number after (?("
303  #define ERR27 "conditional group contains more than two branches"  #define ERR27 "conditional group contains more than two branches"
304  #define ERR28 "assertion expected after (?("  #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 262  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      size_t size;
328    const unsigned char *tables;    const unsigned char *tables;
329    unsigned short int options;    unsigned long int options;
330    unsigned char top_bracket;    unsigned short int top_bracket;
331    unsigned char top_backref;    unsigned short int top_backref;
332    unsigned char first_char;    uschar first_char;
333    unsigned char code[1];    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    
344    
# Line 284  doing the compiling, so that they are th Line 347  doing the compiling, so that they are th
347    
348  typedef struct compile_data {  typedef struct compile_data {
349    const uschar *lcc;            /* Points to lower casing table */    const uschar *lcc;            /* Points to lower casing table */
350    const uschar *fcc;            /* Points to case-flippint table */    const uschar *fcc;            /* Points to case-flipping table */
351    const uschar *cbits;          /* Points to character type table */    const uschar *cbits;          /* Points to character type table */
352    const uschar *ctypes;         /* Points to table of type maps */    const uschar *ctypes;         /* Points to table of type maps */
353  } compile_data;  } compile_data;
# Line 302  typedef struct match_data { Line 365  typedef struct match_data {
365    BOOL   offset_overflow;       /* Set if too many extractions */    BOOL   offset_overflow;       /* Set if too many extractions */
366    BOOL   notbol;                /* NOTBOL flag */    BOOL   notbol;                /* NOTBOL flag */
367    BOOL   noteol;                /* NOTEOL flag */    BOOL   noteol;                /* NOTEOL flag */
368      BOOL   utf8;                  /* UTF8 flag */
369    BOOL   endonly;               /* Dollar not before final \n */    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 */    const uschar *start_subject;  /* Start of the subject string */
373    const uschar *end_subject;    /* End of the subject string */    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 */    const uschar *end_match_ptr;  /* Subject position at end match */
376    int     end_offset_top;       /* Highwater mark at end of match */    int    end_offset_top;        /* Highwater mark at end of match */
377  } match_data;  } match_data;
378    
379  /* Bit definitions for entries in the pcre_ctypes table. */  /* Bit definitions for entries in the pcre_ctypes table. */
# Line 319  typedef struct match_data { Line 386  typedef struct match_data {
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 in pcre_cbits. Each table contains a set  /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
389  of bits for a class map. */  of bits for a class map. Some classes are built by combining these tables. */
390    
391  #define cbit_digit    0      /* for \d */  #define cbit_space     0      /* [:space:] or \s */
392  #define cbit_word    32      /* for \w */  #define cbit_xdigit   32      /* [:xdigit:] */
393  #define cbit_space   64      /* for \s */  #define cbit_digit    64      /* [:digit:] or \d */
394  #define cbit_length  96      /* Length of the cbits table */  #define cbit_upper    96      /* [:upper:] */
395    #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  /* Offsets of the various tables from the base tables pointer, and
404  total length. */  total length. */
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