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revision 3 by nigel, Sat Feb 24 21:38:01 2007 UTC revision 47 by nigel, Sat Feb 24 21:39:29 2007 UTC
# Line 3  Line 3 
3  *************************************************/  *************************************************/
4    
5    
 #define PCRE_VERSION       "1.00 18-Nov-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) 1997-2000 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  /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),  /* Get the definitions provided by running "configure" */
39  define a macro for memmove() if USE_BCOPY is defined. */  
40    #include "config.h"
41    
42  #ifdef USE_BCOPY  /* To cope with SunOS4 and other systems that lack memmove() but have bcopy(),
43    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    #if ! HAVE_MEMMOVE
50    #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>
73  #include <string.h>  #include <string.h>
74  #include "pcre.h"  #include "pcre.h"
75    
76  /* Private options flags start at the most significant end of the two bytes.  /* In case there is no definition of offsetof() provided - though any proper
77  The public options defined in pcre.h start at the least significant end. Make  Standard C system should have one. */
78  sure they don't overlap! */  
79    #ifndef offsetof
80  #define PCRE_FIRSTSET           0x8000  /* first_char is set */  #define offsetof(p_type,field) ((size_t)&(((p_type *)0)->field))
81  #define PCRE_STARTLINE          0x4000  /* start after \n for multiline */  #endif
82  #define PCRE_COMPILED_CASELESS  0x2000  /* like it says */  
83    /* These are the public options that can change during matching. */
84    
85    #define PCRE_IMS (PCRE_CASELESS|PCRE_MULTILINE|PCRE_DOTALL)
86    
87    /* Private options flags start at the most significant end of the four bytes,
88    but skip the top bit so we can use ints for convenience without getting tangled
89    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)
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 92  typedef int BOOL; Line 126  typedef int BOOL;
126  /* 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
127  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
128  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
129  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
130  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
131  greater than ESC_b and less than ESC_X to detect the types that may be  greater than ESC_b and less than ESC_X to detect the types that may be
132  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,
133  that code will have to change. */  that code will have to change. */
134    
135  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,
136           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 };  
137    
138  /* 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
139  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
140  OP_EOL must correspond in order to the list of escapes immediately above. */  OP_EOD must correspond in order to the list of escapes immediately above. */
141    
142  enum {  enum {
143    OP_END,            /* End of pattern */    OP_END,            /* End of pattern */
# Line 124  enum { Line 153  enum {
153    OP_WHITESPACE,         /* \s */    OP_WHITESPACE,         /* \s */
154    OP_NOT_WORDCHAR,       /* \W */    OP_NOT_WORDCHAR,       /* \W */
155    OP_WORDCHAR,           /* \w */    OP_WORDCHAR,           /* \w */
156    OP_CUT,            /* The analogue of Prolog's "cut" operation (extension) */    OP_EODN,           /* End of data or \n at end of data: \Z. */
157    OP_EOD,            /* End of data: or \Z. This must always be the last    OP_EOD,            /* End of data: \z */
                         of the backslashed meta values. */  
158    
159      OP_OPT,            /* Set runtime options */
160    OP_CIRC,           /* Start of line - varies with multiline switch */    OP_CIRC,           /* Start of line - varies with multiline switch */
161    OP_DOLL,           /* End of line - varies with multiline switch */    OP_DOLL,           /* End of line - varies with multiline switch */
162    OP_ANY,            /* Match any character */    OP_ANY,            /* Match any character */
# Line 175  enum { Line 204  enum {
204    
205    OP_CLASS,          /* Match a character class */    OP_CLASS,          /* Match a character class */
206    OP_REF,            /* Match a back reference */    OP_REF,            /* Match a back reference */
207      OP_RECURSE,        /* Match this pattern recursively */
208    
209    OP_ALT,            /* Start of alternation */    OP_ALT,            /* Start of alternation */
210    OP_KET,            /* End of group that doesn't have an unbounded repeat */    OP_KET,            /* End of group that doesn't have an unbounded repeat */
211    OP_KETRMAX,        /* These two must remain together and in this */    OP_KETRMAX,        /* These two must remain together and in this */
212    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */    OP_KETRMIN,        /* order. They are for groups the repeat for ever. */
213    
214    OP_ASSERT,    /* The assertions must come before ONCE and COND */
215    OP_ASSERT_NOT,  
216      OP_ASSERT,         /* Positive lookahead */
217      OP_ASSERT_NOT,     /* Negative lookahead */
218      OP_ASSERTBACK,     /* Positive lookbehind */
219      OP_ASSERTBACK_NOT, /* Negative lookbehind */
220      OP_REVERSE,        /* Move pointer back - used in lookbehind assertions */
221    
222      /* ONCE and COND must come after the assertions, with ONCE first, as there's
223      a test for >= ONCE for a subpattern that isn't an assertion. */
224    
225    OP_ONCE,           /* Once matched, don't back up into the subpattern */    OP_ONCE,           /* Once matched, don't back up into the subpattern */
226      OP_COND,           /* Conditional group */
227      OP_CREF,           /* Used to hold an extraction string number */
228    
229    OP_BRAZERO,        /* These two must remain together and in this */    OP_BRAZERO,        /* These two must remain together and in this */
230    OP_BRAMINZERO,     /* order. */    OP_BRAMINZERO,     /* order. */
# Line 223  just to accommodate the POSIX wrapper. * Line 264  just to accommodate the POSIX wrapper. *
264  #define ERR19 "too many sets of parentheses"  #define ERR19 "too many sets of parentheses"
265  #define ERR20 "regular expression too large"  #define ERR20 "regular expression too large"
266  #define ERR21 "failed to get memory"  #define ERR21 "failed to get memory"
267  #define ERR22 "unmatched brackets"  #define ERR22 "unmatched parentheses"
268  #define ERR23 "internal error: code overflow"  #define ERR23 "internal error: code overflow"
269    #define ERR24 "unrecognized character after (?<"
270    #define ERR25 "lookbehind assertion is not fixed length"
271    #define ERR26 "malformed number after (?("
272    #define ERR27 "conditional group contains more than two branches"
273    #define ERR28 "assertion expected after (?("
274    #define ERR29 "(?p must be followed by )"
275    #define ERR30 "unknown POSIX class name"
276    #define ERR31 "POSIX collating elements are not supported"
277    
278  /* All character handling must be done as unsigned characters. Otherwise there  /* All character handling must be done as unsigned characters. Otherwise there
279  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 239  typedef unsigned char uschar; Line 288  typedef unsigned char uschar;
288  runs on as long as necessary after the end. */  runs on as long as necessary after the end. */
289    
290  typedef struct real_pcre {  typedef struct real_pcre {
291    unsigned int  magic_number;    unsigned long int magic_number;
292    unsigned short int options;    size_t size;
293    unsigned char top_bracket;    const unsigned char *tables;
294    unsigned char top_backref;    unsigned long int options;
295    unsigned char first_char;    uschar top_bracket;
296    unsigned char code[1];    uschar top_backref;
297      uschar first_char;
298      uschar req_char;
299      uschar code[1];
300  } real_pcre;  } real_pcre;
301    
302  /* The real format of the extra block returned by pcre_study(). */  /* The real format of the extra block returned by pcre_study(). */
303    
304  typedef struct real_pcre_extra {  typedef struct real_pcre_extra {
305    unsigned char options;    uschar options;
306    unsigned char start_bits[32];    uschar start_bits[32];
307  } real_pcre_extra;  } real_pcre_extra;
308    
 /* Global tables from chartables.c */  
309    
310  extern uschar pcre_lcc[];  /* Structure for passing "static" information around between the functions
311  extern uschar pcre_fcc[];  doing the compiling, so that they are thread-safe. */
312  extern uschar pcre_cbits[];  
313  extern uschar pcre_ctypes[];  typedef struct compile_data {
314      const uschar *lcc;            /* Points to lower casing table */
315      const uschar *fcc;            /* Points to case-flipping table */
316      const uschar *cbits;          /* Points to character type table */
317      const uschar *ctypes;         /* Points to table of type maps */
318    } compile_data;
319    
320    /* Structure for passing "static" information around between the functions
321    doing the matching, so that they are thread-safe. */
322    
323    typedef struct match_data {
324      int    errorcode;             /* As it says */
325      int   *offset_vector;         /* Offset vector */
326      int    offset_end;            /* One past the end */
327      int    offset_max;            /* The maximum usable for return data */
328      const uschar *lcc;            /* Points to lower casing table */
329      const uschar *ctypes;         /* Points to table of type maps */
330      BOOL   offset_overflow;       /* Set if too many extractions */
331      BOOL   notbol;                /* NOTBOL flag */
332      BOOL   noteol;                /* NOTEOL flag */
333      BOOL   endonly;               /* Dollar not before final \n */
334      BOOL   notempty;              /* Empty string match not wanted */
335      const uschar *start_pattern;  /* For use when recursing */
336      const uschar *start_subject;  /* Start of the subject string */
337      const uschar *end_subject;    /* End of the subject string */
338      const uschar *start_match;    /* Start of this match attempt */
339      const uschar *end_match_ptr;  /* Subject position at end match */
340      int    end_offset_top;        /* Highwater mark at end of match */
341    } match_data;
342    
343  /* Bit definitions for entries in pcre_ctypes[]. */  /* Bit definitions for entries in the pcre_ctypes table. */
344    
345  #define ctype_space   0x01  #define ctype_space   0x01
346  #define ctype_letter  0x02  #define ctype_letter  0x02
# Line 270  extern uschar pcre_ctypes[]; Line 349  extern uschar pcre_ctypes[];
349  #define ctype_word    0x10   /* alphameric or '_' */  #define ctype_word    0x10   /* alphameric or '_' */
350  #define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */  #define ctype_meta    0x80   /* regexp meta char or zero (end pattern) */
351    
352  /* Offsets for the bitmap tables */  /* Offsets for the bitmap tables in pcre_cbits. Each table contains a set
353    of bits for a class map. Some classes are built by combining these tables. */
354    
355  #define cbit_digit    0  #define cbit_space     0      /* [:space:] or \s */
356  #define cbit_letter  32  #define cbit_xdigit   32      /* [:xdigit:] */
357  #define cbit_word    64  #define cbit_digit    64      /* [:digit:] or \d */
358  #define cbit_space   96  #define cbit_upper    96      /* [:upper:] */
359  #define cbit_length 128      /* Length of the cbits table */  #define cbit_lower   128      /* [:lower:] */
360    #define cbit_word    160      /* [:word:] or \w */
361    #define cbit_graph   192      /* [:graph:] */
362    #define cbit_print   224      /* [:print:] */
363    #define cbit_punct   256      /* [:punct:] */
364    #define cbit_cntrl   288      /* [:cntrl:] */
365    #define cbit_length  320      /* Length of the cbits table */
366    
367    /* Offsets of the various tables from the base tables pointer, and
368    total length. */
369    
370    #define lcc_offset      0
371    #define fcc_offset    256
372    #define cbits_offset  512
373    #define ctypes_offset (cbits_offset + cbit_length)
374    #define tables_length (ctypes_offset + 256)
375    
376  /* End of internal.h */  /* End of internal.h */

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