1: /* Definitions for data structures and routines for the regular
2: expression library, version 0.12.
3: Copyright (C) 1985,89,90,91,92,93,95,96,97,98 Free Software Foundation, Inc.
4:
5: This file is part of the GNU C Library. Its master source is NOT part of
6: the C library, however. The master source lives in /gd/gnu/lib.
7:
8: The GNU C Library is free software; you can redistribute it and/or
9: modify it under the terms of the GNU Library General Public License as
10: published by the Free Software Foundation; either version 2 of the
11: License, or (at your option) any later version.
12:
13: The GNU C Library is distributed in the hope that it will be useful,
14: but WITHOUT ANY WARRANTY; without even the implied warranty of
15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16: Library General Public License for more details.
17:
18: You should have received a copy of the GNU Library General Public
19: License along with the GNU C Library; see the file COPYING.LIB. If not,
20: write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21: Boston, MA 02111-1307, USA. */
22:
23: #ifndef _REGEX_H
24: #define _REGEX_H 1
25:
26: /* Allow the use in C++ code. */
27: #ifdef __cplusplus
28: extern "C" {
29: #endif
30:
31: /* POSIX says that <sys/types.h> must be included (by the caller) before
32: <regex.h>. */
33:
34: #if !defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE && defined VMS
35: /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it
36: should be there. */
37: # include <stddef.h>
38: #endif
39:
40: /* The following two types have to be signed and unsigned integer type
41: wide enough to hold a value of a pointer. For most ANSI compilers
42: ptrdiff_t and size_t should be likely OK. Still size of these two
43: types is 2 for Microsoft C. Ugh... */
44: typedef long int s_reg_t;
45: typedef unsigned long int active_reg_t;
46:
47: /* The following bits are used to determine the regexp syntax we
48: recognize. The set/not-set meanings are chosen so that Emacs syntax
49: remains the value 0. The bits are given in alphabetical order, and
50: the definitions shifted by one from the previous bit; thus, when we
51: add or remove a bit, only one other definition need change. */
52: typedef unsigned long int reg_syntax_t;
53:
54: /* If this bit is not set, then \ inside a bracket expression is literal.
55: If set, then such a \ quotes the following character. */
56: #define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1)
57:
58: /* If this bit is not set, then + and ? are operators, and \+ and \? are
59: literals.
60: If set, then \+ and \? are operators and + and ? are literals. */
61: #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
62:
63: /* If this bit is set, then character classes are supported. They are:
64: [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:],
65: [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].
66: If not set, then character classes are not supported. */
67: #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)
68:
69: /* If this bit is set, then ^ and $ are always anchors (outside bracket
70: expressions, of course).
71: If this bit is not set, then it depends:
72: ^ is an anchor if it is at the beginning of a regular
73: expression or after an open-group or an alternation operator;
74: $ is an anchor if it is at the end of a regular expression, or
75: before a close-group or an alternation operator.
76:
77: This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because
78: POSIX draft 11.2 says that * etc. in leading positions is undefined.
79: We already implemented a previous draft which made those constructs
80: invalid, though, so we haven't changed the code back. */
81: #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1)
82:
83: /* If this bit is set, then special characters are always special
84: regardless of where they are in the pattern.
85: If this bit is not set, then special characters are special only in
86: some contexts; otherwise they are ordinary. Specifically,
87: * + ? and intervals are only special when not after the beginning,
88: open-group, or alternation operator. */
89: #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1)
90:
91: /* If this bit is set, then *, +, ?, and { cannot be first in an re or
92: immediately after an alternation or begin-group operator. */
93: #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1)
94:
95: /* If this bit is set, then . matches newline.
96: If not set, then it doesn't. */
97: #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1)
98:
99: /* If this bit is set, then . doesn't match NUL.
100: If not set, then it does. */
101: #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1)
102:
103: /* If this bit is set, nonmatching lists [^...] do not match newline.
104: If not set, they do. */
105: #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1)
106:
107: /* If this bit is set, either \{...\} or {...} defines an
108: interval, depending on RE_NO_BK_BRACES.
109: If not set, \{, \}, {, and } are literals. */
110: #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1)
111:
112: /* If this bit is set, +, ? and | aren't recognized as operators.
113: If not set, they are. */
114: #define RE_LIMITED_OPS (RE_INTERVALS << 1)
115:
116: /* If this bit is set, newline is an alternation operator.
117: If not set, newline is literal. */
118: #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1)
119:
120: /* If this bit is set, then `{...}' defines an interval, and \{ and \}
121: are literals.
122: If not set, then `\{...\}' defines an interval. */
123: #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1)
124:
125: /* If this bit is set, (...) defines a group, and \( and \) are literals.
126: If not set, \(...\) defines a group, and ( and ) are literals. */
127: #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1)
128:
129: /* If this bit is set, then \<digit> matches <digit>.
130: If not set, then \<digit> is a back-reference. */
131: #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1)
132:
133: /* If this bit is set, then | is an alternation operator, and \| is literal.
134: If not set, then \| is an alternation operator, and | is literal. */
135: #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1)
136:
137: /* If this bit is set, then an ending range point collating higher
138: than the starting range point, as in [z-a], is invalid.
139: If not set, then when ending range point collates higher than the
140: starting range point, the range is ignored. */
141: #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1)
142:
143: /* If this bit is set, then an unmatched ) is ordinary.
144: If not set, then an unmatched ) is invalid. */
145: #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1)
146:
147: /* If this bit is set, succeed as soon as we match the whole pattern,
148: without further backtracking. */
149: #define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1)
150:
151: /* If this bit is set, do not process the GNU regex operators.
152: If not set, then the GNU regex operators are recognized. */
153: #define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1)
154:
155: /* If this bit is set, turn on internal regex debugging.
156: If not set, and debugging was on, turn it off.
157: This only works if regex.c is compiled -DDEBUG.
158: We define this bit always, so that all that's needed to turn on
159: debugging is to recompile regex.c; the calling code can always have
160: this bit set, and it won't affect anything in the normal case. */
161: #define RE_DEBUG (RE_NO_GNU_OPS << 1)
162:
163: /* This global variable defines the particular regexp syntax to use (for
164: some interfaces). When a regexp is compiled, the syntax used is
165: stored in the pattern buffer, so changing this does not affect
166: already-compiled regexps. */
167: extern reg_syntax_t re_syntax_options;
168:
169: /* Define combinations of the above bits for the standard possibilities.
170: (The [[[ comments delimit what gets put into the Texinfo file, so
171: don't delete them!) */
172: /* [[[begin syntaxes]]] */
173: #define RE_SYNTAX_EMACS 0
174:
175: #define RE_SYNTAX_AWK \
176: (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \
177: | RE_NO_BK_PARENS | RE_NO_BK_REFS \
178: | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \
179: | RE_DOT_NEWLINE | RE_CONTEXT_INDEP_ANCHORS \
180: | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS)
181:
182: #define RE_SYNTAX_GNU_AWK \
183: ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG) \
184: & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS))
185:
186: #define RE_SYNTAX_POSIX_AWK \
187: (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS \
188: | RE_INTERVALS | RE_NO_GNU_OPS)
189:
190: #define RE_SYNTAX_GREP \
191: (RE_BK_PLUS_QM | RE_CHAR_CLASSES \
192: | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \
193: | RE_NEWLINE_ALT)
194:
195: #define RE_SYNTAX_EGREP \
196: (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \
197: | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \
198: | RE_NEWLINE_ALT | RE_NO_BK_PARENS \
199: | RE_NO_BK_VBAR)
200:
201: #define RE_SYNTAX_POSIX_EGREP \
202: (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES)
203:
204: /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */
205: #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC
206:
207: #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC
208:
209: /* Syntax bits common to both basic and extended POSIX regex syntax. */
210: #define _RE_SYNTAX_POSIX_COMMON \
211: (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \
212: | RE_INTERVALS | RE_NO_EMPTY_RANGES)
213:
214: #define RE_SYNTAX_POSIX_BASIC \
215: (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM)
216:
217: /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes
218: RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this
219: isn't minimal, since other operators, such as \`, aren't disabled. */
220: #define RE_SYNTAX_POSIX_MINIMAL_BASIC \
221: (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS)
222:
223: #define RE_SYNTAX_POSIX_EXTENDED \
224: (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
225: | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \
226: | RE_NO_BK_PARENS | RE_NO_BK_VBAR \
227: | RE_UNMATCHED_RIGHT_PAREN_ORD)
228:
229: /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS
230: replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */
231: #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \
232: (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \
233: | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \
234: | RE_NO_BK_PARENS | RE_NO_BK_REFS \
235: | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD)
236: /* [[[end syntaxes]]] */
237:
238: /* Maximum number of duplicates an interval can allow. Some systems
239: (erroneously) define this in other header files, but we want our
240: value, so remove any previous define. */
241: #ifdef RE_DUP_MAX
242: # undef RE_DUP_MAX
243: #endif
244: /* If sizeof(int) == 2, then ((1 << 15) - 1) overflows. */
245: #define RE_DUP_MAX (0x7fff)
246:
247:
248: /* POSIX `cflags' bits (i.e., information for `regcomp'). */
249:
250: /* If this bit is set, then use extended regular expression syntax.
251: If not set, then use basic regular expression syntax. */
252: #define REG_EXTENDED 1
253:
254: /* If this bit is set, then ignore case when matching.
255: If not set, then case is significant. */
256: #define REG_ICASE (REG_EXTENDED << 1)
257:
258: /* If this bit is set, then anchors do not match at newline
259: characters in the string.
260: If not set, then anchors do match at newlines. */
261: #define REG_NEWLINE (REG_ICASE << 1)
262:
263: /* If this bit is set, then report only success or fail in regexec.
264: If not set, then returns differ between not matching and errors. */
265: #define REG_NOSUB (REG_NEWLINE << 1)
266:
267:
268: /* POSIX `eflags' bits (i.e., information for regexec). */
269:
270: /* If this bit is set, then the beginning-of-line operator doesn't match
271: the beginning of the string (presumably because it's not the
272: beginning of a line).
273: If not set, then the beginning-of-line operator does match the
274: beginning of the string. */
275: #define REG_NOTBOL 1
276:
277: /* Like REG_NOTBOL, except for the end-of-line. */
278: #define REG_NOTEOL (1 << 1)
279:
280:
281: /* If any error codes are removed, changed, or added, update the
282: `re_error_msg' table in regex.c. */
283: typedef enum
284: {
285: #ifdef _XOPEN_SOURCE
286: REG_ENOSYS = -1, /* This will never happen for this implementation. */
287: #endif
288:
289: REG_NOERROR = 0, /* Success. */
290: REG_NOMATCH, /* Didn't find a match (for regexec). */
291:
292: /* POSIX regcomp return error codes. (In the order listed in the
293: standard.) */
294: REG_BADPAT, /* Invalid pattern. */
295: REG_ECOLLATE, /* Not implemented. */
296: REG_ECTYPE, /* Invalid character class name. */
297: REG_EESCAPE, /* Trailing backslash. */
298: REG_ESUBREG, /* Invalid back reference. */
299: REG_EBRACK, /* Unmatched left bracket. */
300: REG_EPAREN, /* Parenthesis imbalance. */
301: REG_EBRACE, /* Unmatched \{. */
302: REG_BADBR, /* Invalid contents of \{\}. */
303: REG_ERANGE, /* Invalid range end. */
304: REG_ESPACE, /* Ran out of memory. */
305: REG_BADRPT, /* No preceding re for repetition op. */
306:
307: /* Error codes we've added. */
308: REG_EEND, /* Premature end. */
309: REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */
310: REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */
311: } reg_errcode_t;
312:
313: /* This data structure represents a compiled pattern. Before calling
314: the pattern compiler, the fields `buffer', `allocated', `fastmap',
315: `translate', and `no_sub' can be set. After the pattern has been
316: compiled, the `re_nsub' field is available. All other fields are
317: private to the regex routines. */
318:
319: #ifndef RE_TRANSLATE_TYPE
320: # define RE_TRANSLATE_TYPE char *
321: #endif
322:
323: struct re_pattern_buffer
324: {
325: /* [[[begin pattern_buffer]]] */
326: /* Space that holds the compiled pattern. It is declared as
327: `unsigned char *' because its elements are
328: sometimes used as array indexes. */
329: unsigned char *buffer;
330:
331: /* Number of bytes to which `buffer' points. */
332: unsigned long int allocated;
333:
334: /* Number of bytes actually used in `buffer'. */
335: unsigned long int used;
336:
337: /* Syntax setting with which the pattern was compiled. */
338: reg_syntax_t syntax;
339:
340: /* Pointer to a fastmap, if any, otherwise zero. re_search uses
341: the fastmap, if there is one, to skip over impossible
342: starting points for matches. */
343: char *fastmap;
344:
345: /* Either a translate table to apply to all characters before
346: comparing them, or zero for no translation. The translation
347: is applied to a pattern when it is compiled and to a string
348: when it is matched. */
349: RE_TRANSLATE_TYPE translate;
350:
351: /* Number of subexpressions found by the compiler. */
352: size_t re_nsub;
353:
354: /* Zero if this pattern cannot match the empty string, one else.
355: Well, in truth it's used only in `re_search_2', to see
356: whether or not we should use the fastmap, so we don't set
357: this absolutely perfectly; see `re_compile_fastmap' (the
358: `duplicate' case). */
359: unsigned can_be_null : 1;
360:
361: /* If REGS_UNALLOCATED, allocate space in the `regs' structure
362: for `max (RE_NREGS, re_nsub + 1)' groups.
363: If REGS_REALLOCATE, reallocate space if necessary.
364: If REGS_FIXED, use what's there. */
365: #define REGS_UNALLOCATED 0
366: #define REGS_REALLOCATE 1
367: #define REGS_FIXED 2
368: unsigned regs_allocated : 2;
369:
370: /* Set to zero when `regex_compile' compiles a pattern; set to one
371: by `re_compile_fastmap' if it updates the fastmap. */
372: unsigned fastmap_accurate : 1;
373:
374: /* If set, `re_match_2' does not return information about
375: subexpressions. */
376: unsigned no_sub : 1;
377:
378: /* If set, a beginning-of-line anchor doesn't match at the
379: beginning of the string. */
380: unsigned not_bol : 1;
381:
382: /* Similarly for an end-of-line anchor. */
383: unsigned not_eol : 1;
384:
385: /* If true, an anchor at a newline matches. */
386: unsigned newline_anchor : 1;
387:
388: /* [[[end pattern_buffer]]] */
389: };
390:
391: typedef struct re_pattern_buffer regex_t;
392:
393: /* Type for byte offsets within the string. POSIX mandates this. */
394: typedef int regoff_t;
395:
396:
397: /* This is the structure we store register match data in. See
398: regex.texinfo for a full description of what registers match. */
399: struct re_registers
400: {
401: unsigned num_regs;
402: regoff_t *start;
403: regoff_t *end;
404: };
405:
406:
407: /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer,
408: `re_match_2' returns information about at least this many registers
409: the first time a `regs' structure is passed. */
410: #ifndef RE_NREGS
411: # define RE_NREGS 30
412: #endif
413:
414:
415: /* POSIX specification for registers. Aside from the different names than
416: `re_registers', POSIX uses an array of structures, instead of a
417: structure of arrays. */
418: typedef struct
419: {
420: regoff_t rm_so; /* Byte offset from string's start to substring's start. */
421: regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
422: } regmatch_t;
423:
424: /* Declarations for routines. */
425:
426: /* To avoid duplicating every routine declaration -- once with a
427: prototype (if we are ANSI), and once without (if we aren't) -- we
428: use the following macro to declare argument types. This
429: unfortunately clutters up the declarations a bit, but I think it's
430: worth it. */
431:
432: #if __STDC__
433:
434: # define _RE_ARGS(args) args
435:
436: #else /* not __STDC__ */
437:
438: # define _RE_ARGS(args) ()
439:
440: #endif /* not __STDC__ */
441:
442: /* Sets the current default syntax to SYNTAX, and return the old syntax.
443: You can also simply assign to the `re_syntax_options' variable. */
444: extern reg_syntax_t re_set_syntax _RE_ARGS ((reg_syntax_t syntax));
445:
446: /* Compile the regular expression PATTERN, with length LENGTH
447: and syntax given by the global `re_syntax_options', into the buffer
448: BUFFER. Return NULL if successful, and an error string if not. */
449: extern const char *re_compile_pattern
450: _RE_ARGS ((const char *pattern, size_t length,
451: struct re_pattern_buffer *buffer));
452:
453:
454: /* Compile a fastmap for the compiled pattern in BUFFER; used to
455: accelerate searches. Return 0 if successful and -2 if was an
456: internal error. */
457: extern int re_compile_fastmap _RE_ARGS ((struct re_pattern_buffer *buffer));
458:
459:
460: /* Search in the string STRING (with length LENGTH) for the pattern
461: compiled into BUFFER. Start searching at position START, for RANGE
462: characters. Return the starting position of the match, -1 for no
463: match, or -2 for an internal error. Also return register
464: information in REGS (if REGS and BUFFER->no_sub are nonzero). */
465: extern int re_search
466: _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string,
467: int length, int start, int range, struct re_registers *regs));
468:
469:
470: /* Like `re_search', but search in the concatenation of STRING1 and
471: STRING2. Also, stop searching at index START + STOP. */
472: extern int re_search_2
473: _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1,
474: int length1, const char *string2, int length2,
475: int start, int range, struct re_registers *regs, int stop));
476:
477:
478: /* Like `re_search', but return how many characters in STRING the regexp
479: in BUFFER matched, starting at position START. */
480: extern int re_match
481: _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string,
482: int length, int start, struct re_registers *regs));
483:
484:
485: /* Relates to `re_match' as `re_search_2' relates to `re_search'. */
486: extern int re_match_2
487: _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1,
488: int length1, const char *string2, int length2,
489: int start, struct re_registers *regs, int stop));
490:
491:
492: /* Set REGS to hold NUM_REGS registers, storing them in STARTS and
493: ENDS. Subsequent matches using BUFFER and REGS will use this memory
494: for recording register information. STARTS and ENDS must be
495: allocated with malloc, and must each be at least `NUM_REGS * sizeof
496: (regoff_t)' bytes long.
497:
498: If NUM_REGS == 0, then subsequent matches should allocate their own
499: register data.
500:
501: Unless this function is called, the first search or match using
502: PATTERN_BUFFER will allocate its own register data, without
503: freeing the old data. */
504: extern void re_set_registers
505: _RE_ARGS ((struct re_pattern_buffer *buffer, struct re_registers *regs,
506: unsigned num_regs, regoff_t *starts, regoff_t *ends));
507:
508: #if defined _REGEX_RE_COMP || defined _LIBC
509: # ifndef _CRAY
510: /* 4.2 bsd compatibility. */
511: extern char *re_comp _RE_ARGS ((const char *));
512: extern int re_exec _RE_ARGS ((const char *));
513: # endif
514: #endif
515:
516: /* POSIX compatibility. */
517: extern int regcomp _RE_ARGS ((regex_t *__preg, const char *__pattern,
518: int __cflags));
519:
520: extern int regexec _RE_ARGS ((const regex_t *__preg,
521: const char *__string, size_t __nmatch,
522: regmatch_t __pmatch[], int __eflags));
523:
524: extern size_t regerror _RE_ARGS ((int __errcode, const regex_t *__preg,
525: char *__errbuf, size_t __errbuf_size));
526:
527: extern void regfree _RE_ARGS ((regex_t *__preg));
528:
529:
530: #ifdef __cplusplus
531: }
532: #endif /* C++ */
533:
534: #endif /* regex.h */
535:
536: /*
537: Local variables:
538: make-backup-files: t
539: version-control: t
540: trim-versions-without-asking: nil
541: End:
542: */
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