Mercurial > hg > octave-shane > gnulib-hg
annotate lib/regex.h @ 1283:1630d40799c0
update from libc/copies
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Mon, 23 Mar 1998 07:24:54 +0000 |
| parents | ba13cef00d11 |
| children | 6edda82f9fd9 |
| rev | line source |
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| 14 | 1 /* Definitions for data structures and routines for the regular |
| 389 | 2 expression library, version 0.12. |
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3 Copyright (C) 1985,89,90,91,92,93,95,96,97 Free Software Foundation, Inc. |
| 14 | 4 |
| 1283 | 5 |
| 6 NOTE: The canonical source of this file is maintained with the GNU C Library. | |
| 7 Bugs can be reported to bug-glibc@prep.ai.mit.edu. | |
| 14 | 8 |
| 1283 | 9 This program is free software; you can redistribute it and/or modify it |
| 10 under the terms of the GNU General Public License as published by the | |
| 11 Free Software Foundation; either version 2, or (at your option) any | |
| 12 later version. | |
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13 |
| 1283 | 14 This program is distributed in the hope that it will be useful, |
| 15 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 17 GNU General Public License for more details. | |
| 14 | 18 |
| 1283 | 19 You should have received a copy of the GNU General Public License |
| 20 along with this program; if not, write to the Free Software | |
| 21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
| 22 USA. */ | |
| 14 | 23 |
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24 #ifndef _REGEX_H |
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25 #define _REGEX_H 1 |
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26 |
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27 /* Allow the use in C++ code. */ |
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28 #ifdef __cplusplus |
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29 extern "C" { |
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30 #endif |
| 14 | 31 |
| 389 | 32 /* POSIX says that <sys/types.h> must be included (by the caller) before |
| 33 <regex.h>. */ | |
| 34 | |
| 1283 | 35 #if !defined _POSIX_C_SOURCE && !defined _POSIX_SOURCE && defined VMS |
| 389 | 36 /* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it |
| 37 should be there. */ | |
| 1283 | 38 # include <stddef.h> |
| 389 | 39 #endif |
| 40 | |
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41 /* The following two types have to be signed and unsigned integer type |
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42 wide enough to hold a value of a pointer. For most ANSI compilers |
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43 ptrdiff_t and size_t should be likely OK. Still size of these two |
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44 types is 2 for Microsoft C. Ugh... */ |
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45 typedef long int s_reg_t; |
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46 typedef unsigned long int active_reg_t; |
| 14 | 47 |
| 48 /* The following bits are used to determine the regexp syntax we | |
| 49 recognize. The set/not-set meanings are chosen so that Emacs syntax | |
| 50 remains the value 0. The bits are given in alphabetical order, and | |
| 51 the definitions shifted by one from the previous bit; thus, when we | |
| 52 add or remove a bit, only one other definition need change. */ | |
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53 typedef unsigned long int reg_syntax_t; |
| 14 | 54 |
| 55 /* If this bit is not set, then \ inside a bracket expression is literal. | |
| 56 If set, then such a \ quotes the following character. */ | |
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57 #define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1) |
| 14 | 58 |
| 59 /* If this bit is not set, then + and ? are operators, and \+ and \? are | |
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60 literals. |
| 14 | 61 If set, then \+ and \? are operators and + and ? are literals. */ |
| 62 #define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1) | |
| 63 | |
| 64 /* If this bit is set, then character classes are supported. They are: | |
| 65 [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:], | |
| 66 [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:]. | |
| 67 If not set, then character classes are not supported. */ | |
| 68 #define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1) | |
| 69 | |
| 70 /* If this bit is set, then ^ and $ are always anchors (outside bracket | |
| 71 expressions, of course). | |
| 72 If this bit is not set, then it depends: | |
| 73 ^ is an anchor if it is at the beginning of a regular | |
| 74 expression or after an open-group or an alternation operator; | |
| 75 $ is an anchor if it is at the end of a regular expression, or | |
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76 before a close-group or an alternation operator. |
| 14 | 77 |
| 78 This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because | |
| 79 POSIX draft 11.2 says that * etc. in leading positions is undefined. | |
| 80 We already implemented a previous draft which made those constructs | |
| 81 invalid, though, so we haven't changed the code back. */ | |
| 82 #define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1) | |
| 83 | |
| 84 /* If this bit is set, then special characters are always special | |
| 85 regardless of where they are in the pattern. | |
| 86 If this bit is not set, then special characters are special only in | |
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87 some contexts; otherwise they are ordinary. Specifically, |
| 14 | 88 * + ? and intervals are only special when not after the beginning, |
| 89 open-group, or alternation operator. */ | |
| 90 #define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1) | |
| 91 | |
| 92 /* If this bit is set, then *, +, ?, and { cannot be first in an re or | |
| 93 immediately after an alternation or begin-group operator. */ | |
| 94 #define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1) | |
| 95 | |
| 96 /* If this bit is set, then . matches newline. | |
| 97 If not set, then it doesn't. */ | |
| 98 #define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1) | |
| 99 | |
| 100 /* If this bit is set, then . doesn't match NUL. | |
| 101 If not set, then it does. */ | |
| 102 #define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1) | |
| 103 | |
| 104 /* If this bit is set, nonmatching lists [^...] do not match newline. | |
| 105 If not set, they do. */ | |
| 106 #define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1) | |
| 107 | |
| 108 /* If this bit is set, either \{...\} or {...} defines an | |
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109 interval, depending on RE_NO_BK_BRACES. |
| 14 | 110 If not set, \{, \}, {, and } are literals. */ |
| 111 #define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1) | |
| 112 | |
| 113 /* If this bit is set, +, ? and | aren't recognized as operators. | |
| 114 If not set, they are. */ | |
| 115 #define RE_LIMITED_OPS (RE_INTERVALS << 1) | |
| 116 | |
| 117 /* If this bit is set, newline is an alternation operator. | |
| 118 If not set, newline is literal. */ | |
| 119 #define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1) | |
| 120 | |
| 121 /* If this bit is set, then `{...}' defines an interval, and \{ and \} | |
| 122 are literals. | |
| 123 If not set, then `\{...\}' defines an interval. */ | |
| 124 #define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1) | |
| 125 | |
| 126 /* If this bit is set, (...) defines a group, and \( and \) are literals. | |
| 127 If not set, \(...\) defines a group, and ( and ) are literals. */ | |
| 128 #define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1) | |
| 129 | |
| 130 /* If this bit is set, then \<digit> matches <digit>. | |
| 131 If not set, then \<digit> is a back-reference. */ | |
| 132 #define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1) | |
| 133 | |
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134 /* If this bit is set, then | is an alternation operator, and \| is literal. |
| 14 | 135 If not set, then \| is an alternation operator, and | is literal. */ |
| 136 #define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1) | |
| 137 | |
| 138 /* If this bit is set, then an ending range point collating higher | |
| 139 than the starting range point, as in [z-a], is invalid. | |
| 140 If not set, then when ending range point collates higher than the | |
| 141 starting range point, the range is ignored. */ | |
| 142 #define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1) | |
| 143 | |
| 144 /* If this bit is set, then an unmatched ) is ordinary. | |
| 145 If not set, then an unmatched ) is invalid. */ | |
| 146 #define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1) | |
| 147 | |
| 389 | 148 /* If this bit is set, succeed as soon as we match the whole pattern, |
| 149 without further backtracking. */ | |
| 150 #define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1) | |
| 151 | |
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152 /* If this bit is set, do not process the GNU regex operators. |
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153 If not set, then the GNU regex operators are recognized. */ |
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154 #define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1) |
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155 |
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156 /* If this bit is set, turn on internal regex debugging. |
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157 If not set, and debugging was on, turn it off. |
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158 This only works if regex.c is compiled -DDEBUG. |
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159 We define this bit always, so that all that's needed to turn on |
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160 debugging is to recompile regex.c; the calling code can always have |
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161 this bit set, and it won't affect anything in the normal case. */ |
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162 #define RE_DEBUG (RE_NO_GNU_OPS << 1) |
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163 |
| 14 | 164 /* This global variable defines the particular regexp syntax to use (for |
| 165 some interfaces). When a regexp is compiled, the syntax used is | |
| 166 stored in the pattern buffer, so changing this does not affect | |
| 167 already-compiled regexps. */ | |
| 168 extern reg_syntax_t re_syntax_options; | |
| 169 | |
| 170 /* Define combinations of the above bits for the standard possibilities. | |
| 171 (The [[[ comments delimit what gets put into the Texinfo file, so | |
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172 don't delete them!) */ |
| 14 | 173 /* [[[begin syntaxes]]] */ |
| 174 #define RE_SYNTAX_EMACS 0 | |
| 175 | |
| 176 #define RE_SYNTAX_AWK \ | |
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177 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \ |
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178 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ |
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179 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \ |
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180 | RE_DOT_NEWLINE | RE_CONTEXT_INDEP_ANCHORS \ |
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181 | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS) |
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182 |
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183 #define RE_SYNTAX_GNU_AWK \ |
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184 ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DEBUG) \ |
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185 & ~(RE_DOT_NOT_NULL | RE_INTERVALS | RE_CONTEXT_INDEP_OPS)) |
| 14 | 186 |
| 187 #define RE_SYNTAX_POSIX_AWK \ | |
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188 (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS \ |
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189 | RE_INTERVALS | RE_NO_GNU_OPS) |
| 14 | 190 |
| 191 #define RE_SYNTAX_GREP \ | |
| 192 (RE_BK_PLUS_QM | RE_CHAR_CLASSES \ | |
| 193 | RE_HAT_LISTS_NOT_NEWLINE | RE_INTERVALS \ | |
| 194 | RE_NEWLINE_ALT) | |
| 195 | |
| 196 #define RE_SYNTAX_EGREP \ | |
| 197 (RE_CHAR_CLASSES | RE_CONTEXT_INDEP_ANCHORS \ | |
| 198 | RE_CONTEXT_INDEP_OPS | RE_HAT_LISTS_NOT_NEWLINE \ | |
| 199 | RE_NEWLINE_ALT | RE_NO_BK_PARENS \ | |
| 200 | RE_NO_BK_VBAR) | |
| 201 | |
| 202 #define RE_SYNTAX_POSIX_EGREP \ | |
| 203 (RE_SYNTAX_EGREP | RE_INTERVALS | RE_NO_BK_BRACES) | |
| 204 | |
| 389 | 205 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */ |
| 206 #define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC | |
| 207 | |
| 14 | 208 #define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC |
| 209 | |
| 210 /* Syntax bits common to both basic and extended POSIX regex syntax. */ | |
| 211 #define _RE_SYNTAX_POSIX_COMMON \ | |
| 212 (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \ | |
| 213 | RE_INTERVALS | RE_NO_EMPTY_RANGES) | |
| 214 | |
| 215 #define RE_SYNTAX_POSIX_BASIC \ | |
| 216 (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM) | |
| 217 | |
| 218 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes | |
| 219 RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this | |
| 220 isn't minimal, since other operators, such as \`, aren't disabled. */ | |
| 221 #define RE_SYNTAX_POSIX_MINIMAL_BASIC \ | |
| 222 (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS) | |
| 223 | |
| 224 #define RE_SYNTAX_POSIX_EXTENDED \ | |
| 225 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ | |
| 226 | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \ | |
| 227 | RE_NO_BK_PARENS | RE_NO_BK_VBAR \ | |
| 228 | RE_UNMATCHED_RIGHT_PAREN_ORD) | |
| 229 | |
| 230 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INVALID_OPS | |
| 231 replaces RE_CONTEXT_INDEP_OPS and RE_NO_BK_REFS is added. */ | |
| 232 #define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \ | |
| 233 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ | |
| 234 | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \ | |
| 235 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ | |
| 236 | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD) | |
| 237 /* [[[end syntaxes]]] */ | |
| 238 | |
| 239 /* Maximum number of duplicates an interval can allow. Some systems | |
| 240 (erroneously) define this in other header files, but we want our | |
| 241 value, so remove any previous define. */ | |
| 242 #ifdef RE_DUP_MAX | |
| 1283 | 243 # undef RE_DUP_MAX |
| 14 | 244 #endif |
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245 /* If sizeof(int) == 2, then ((1 << 15) - 1) overflows. */ |
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246 #define RE_DUP_MAX (0x7fff) |
| 14 | 247 |
| 248 | |
| 249 /* POSIX `cflags' bits (i.e., information for `regcomp'). */ | |
| 250 | |
| 251 /* If this bit is set, then use extended regular expression syntax. | |
| 252 If not set, then use basic regular expression syntax. */ | |
| 253 #define REG_EXTENDED 1 | |
| 254 | |
| 255 /* If this bit is set, then ignore case when matching. | |
| 256 If not set, then case is significant. */ | |
| 257 #define REG_ICASE (REG_EXTENDED << 1) | |
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258 |
| 14 | 259 /* If this bit is set, then anchors do not match at newline |
| 260 characters in the string. | |
| 261 If not set, then anchors do match at newlines. */ | |
| 262 #define REG_NEWLINE (REG_ICASE << 1) | |
| 263 | |
| 264 /* If this bit is set, then report only success or fail in regexec. | |
| 265 If not set, then returns differ between not matching and errors. */ | |
| 266 #define REG_NOSUB (REG_NEWLINE << 1) | |
| 267 | |
| 268 | |
| 269 /* POSIX `eflags' bits (i.e., information for regexec). */ | |
| 270 | |
| 271 /* If this bit is set, then the beginning-of-line operator doesn't match | |
| 272 the beginning of the string (presumably because it's not the | |
| 273 beginning of a line). | |
| 274 If not set, then the beginning-of-line operator does match the | |
| 275 beginning of the string. */ | |
| 276 #define REG_NOTBOL 1 | |
| 277 | |
| 278 /* Like REG_NOTBOL, except for the end-of-line. */ | |
| 279 #define REG_NOTEOL (1 << 1) | |
| 280 | |
| 281 | |
| 282 /* If any error codes are removed, changed, or added, update the | |
| 283 `re_error_msg' table in regex.c. */ | |
| 284 typedef enum | |
| 285 { | |
| 1283 | 286 #if (_XOPEN_SOURCE - 0) == 500 |
| 287 REG_NOSYS = -1, /* This will never happen for this implementation. */ | |
| 288 #endif | |
| 289 | |
| 14 | 290 REG_NOERROR = 0, /* Success. */ |
| 291 REG_NOMATCH, /* Didn't find a match (for regexec). */ | |
| 292 | |
| 293 /* POSIX regcomp return error codes. (In the order listed in the | |
| 294 standard.) */ | |
| 295 REG_BADPAT, /* Invalid pattern. */ | |
| 296 REG_ECOLLATE, /* Not implemented. */ | |
| 297 REG_ECTYPE, /* Invalid character class name. */ | |
| 298 REG_EESCAPE, /* Trailing backslash. */ | |
| 299 REG_ESUBREG, /* Invalid back reference. */ | |
| 300 REG_EBRACK, /* Unmatched left bracket. */ | |
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301 REG_EPAREN, /* Parenthesis imbalance. */ |
| 14 | 302 REG_EBRACE, /* Unmatched \{. */ |
| 303 REG_BADBR, /* Invalid contents of \{\}. */ | |
| 304 REG_ERANGE, /* Invalid range end. */ | |
| 305 REG_ESPACE, /* Ran out of memory. */ | |
| 306 REG_BADRPT, /* No preceding re for repetition op. */ | |
| 307 | |
| 308 /* Error codes we've added. */ | |
| 309 REG_EEND, /* Premature end. */ | |
| 310 REG_ESIZE, /* Compiled pattern bigger than 2^16 bytes. */ | |
| 311 REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */ | |
| 312 } reg_errcode_t; | |
| 313 | |
| 314 /* This data structure represents a compiled pattern. Before calling | |
| 315 the pattern compiler, the fields `buffer', `allocated', `fastmap', | |
| 316 `translate', and `no_sub' can be set. After the pattern has been | |
| 317 compiled, the `re_nsub' field is available. All other fields are | |
| 318 private to the regex routines. */ | |
| 319 | |
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320 #ifndef RE_TRANSLATE_TYPE |
| 1283 | 321 # define RE_TRANSLATE_TYPE char * |
| 502 | 322 #endif |
| 323 | |
| 14 | 324 struct re_pattern_buffer |
| 325 { | |
| 326 /* [[[begin pattern_buffer]]] */ | |
| 327 /* Space that holds the compiled pattern. It is declared as | |
| 328 `unsigned char *' because its elements are | |
| 329 sometimes used as array indexes. */ | |
| 330 unsigned char *buffer; | |
| 331 | |
| 332 /* Number of bytes to which `buffer' points. */ | |
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333 unsigned long int allocated; |
| 14 | 334 |
| 335 /* Number of bytes actually used in `buffer'. */ | |
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336 unsigned long int used; |
| 14 | 337 |
| 338 /* Syntax setting with which the pattern was compiled. */ | |
| 339 reg_syntax_t syntax; | |
| 340 | |
| 341 /* Pointer to a fastmap, if any, otherwise zero. re_search uses | |
| 342 the fastmap, if there is one, to skip over impossible | |
| 343 starting points for matches. */ | |
| 344 char *fastmap; | |
| 345 | |
| 346 /* Either a translate table to apply to all characters before | |
| 347 comparing them, or zero for no translation. The translation | |
| 348 is applied to a pattern when it is compiled and to a string | |
| 349 when it is matched. */ | |
| 502 | 350 RE_TRANSLATE_TYPE translate; |
| 14 | 351 |
| 352 /* Number of subexpressions found by the compiler. */ | |
| 353 size_t re_nsub; | |
| 354 | |
| 355 /* Zero if this pattern cannot match the empty string, one else. | |
| 356 Well, in truth it's used only in `re_search_2', to see | |
| 357 whether or not we should use the fastmap, so we don't set | |
| 358 this absolutely perfectly; see `re_compile_fastmap' (the | |
| 359 `duplicate' case). */ | |
| 360 unsigned can_be_null : 1; | |
| 361 | |
| 362 /* If REGS_UNALLOCATED, allocate space in the `regs' structure | |
| 363 for `max (RE_NREGS, re_nsub + 1)' groups. | |
| 364 If REGS_REALLOCATE, reallocate space if necessary. | |
| 365 If REGS_FIXED, use what's there. */ | |
| 366 #define REGS_UNALLOCATED 0 | |
| 367 #define REGS_REALLOCATE 1 | |
| 368 #define REGS_FIXED 2 | |
| 369 unsigned regs_allocated : 2; | |
| 370 | |
| 389 | 371 /* Set to zero when `regex_compile' compiles a pattern; set to one |
| 372 by `re_compile_fastmap' if it updates the fastmap. */ | |
| 14 | 373 unsigned fastmap_accurate : 1; |
| 374 | |
| 389 | 375 /* If set, `re_match_2' does not return information about |
| 376 subexpressions. */ | |
| 14 | 377 unsigned no_sub : 1; |
| 378 | |
| 379 /* If set, a beginning-of-line anchor doesn't match at the | |
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380 beginning of the string. */ |
| 14 | 381 unsigned not_bol : 1; |
| 382 | |
| 383 /* Similarly for an end-of-line anchor. */ | |
| 384 unsigned not_eol : 1; | |
| 385 | |
| 386 /* If true, an anchor at a newline matches. */ | |
| 387 unsigned newline_anchor : 1; | |
| 388 | |
| 389 /* [[[end pattern_buffer]]] */ | |
| 390 }; | |
| 391 | |
| 392 typedef struct re_pattern_buffer regex_t; | |
| 393 | |
| 394 /* Type for byte offsets within the string. POSIX mandates this. */ | |
| 395 typedef int regoff_t; | |
| 396 | |
| 397 | |
| 398 /* This is the structure we store register match data in. See | |
| 399 regex.texinfo for a full description of what registers match. */ | |
| 400 struct re_registers | |
| 401 { | |
| 402 unsigned num_regs; | |
| 403 regoff_t *start; | |
| 404 regoff_t *end; | |
| 405 }; | |
| 406 | |
| 407 | |
| 408 /* If `regs_allocated' is REGS_UNALLOCATED in the pattern buffer, | |
| 409 `re_match_2' returns information about at least this many registers | |
| 410 the first time a `regs' structure is passed. */ | |
| 411 #ifndef RE_NREGS | |
| 1283 | 412 # define RE_NREGS 30 |
| 14 | 413 #endif |
| 414 | |
| 415 | |
| 416 /* POSIX specification for registers. Aside from the different names than | |
| 417 `re_registers', POSIX uses an array of structures, instead of a | |
| 418 structure of arrays. */ | |
| 419 typedef struct | |
| 420 { | |
| 421 regoff_t rm_so; /* Byte offset from string's start to substring's start. */ | |
| 422 regoff_t rm_eo; /* Byte offset from string's start to substring's end. */ | |
| 423 } regmatch_t; | |
| 424 | |
| 425 /* Declarations for routines. */ | |
| 426 | |
| 427 /* To avoid duplicating every routine declaration -- once with a | |
| 428 prototype (if we are ANSI), and once without (if we aren't) -- we | |
| 429 use the following macro to declare argument types. This | |
| 430 unfortunately clutters up the declarations a bit, but I think it's | |
| 389 | 431 worth it. */ |
| 14 | 432 |
| 433 #if __STDC__ | |
| 389 | 434 |
| 1283 | 435 # define _RE_ARGS(args) args |
| 389 | 436 |
| 437 #else /* not __STDC__ */ | |
| 438 | |
| 1283 | 439 # define _RE_ARGS(args) () |
| 389 | 440 |
| 441 #endif /* not __STDC__ */ | |
| 14 | 442 |
| 443 /* Sets the current default syntax to SYNTAX, and return the old syntax. | |
| 444 You can also simply assign to the `re_syntax_options' variable. */ | |
| 445 extern reg_syntax_t re_set_syntax _RE_ARGS ((reg_syntax_t syntax)); | |
| 446 | |
| 447 /* Compile the regular expression PATTERN, with length LENGTH | |
| 448 and syntax given by the global `re_syntax_options', into the buffer | |
| 449 BUFFER. Return NULL if successful, and an error string if not. */ | |
| 450 extern const char *re_compile_pattern | |
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451 _RE_ARGS ((const char *pattern, size_t length, |
| 14 | 452 struct re_pattern_buffer *buffer)); |
| 453 | |
| 454 | |
| 455 /* Compile a fastmap for the compiled pattern in BUFFER; used to | |
| 456 accelerate searches. Return 0 if successful and -2 if was an | |
| 457 internal error. */ | |
| 458 extern int re_compile_fastmap _RE_ARGS ((struct re_pattern_buffer *buffer)); | |
| 459 | |
| 460 | |
| 461 /* Search in the string STRING (with length LENGTH) for the pattern | |
| 462 compiled into BUFFER. Start searching at position START, for RANGE | |
| 463 characters. Return the starting position of the match, -1 for no | |
| 464 match, or -2 for an internal error. Also return register | |
| 465 information in REGS (if REGS and BUFFER->no_sub are nonzero). */ | |
| 466 extern int re_search | |
| 467 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string, | |
| 468 int length, int start, int range, struct re_registers *regs)); | |
| 469 | |
| 470 | |
| 471 /* Like `re_search', but search in the concatenation of STRING1 and | |
| 472 STRING2. Also, stop searching at index START + STOP. */ | |
| 473 extern int re_search_2 | |
| 474 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1, | |
| 475 int length1, const char *string2, int length2, | |
| 476 int start, int range, struct re_registers *regs, int stop)); | |
| 477 | |
| 478 | |
| 479 /* Like `re_search', but return how many characters in STRING the regexp | |
| 480 in BUFFER matched, starting at position START. */ | |
| 481 extern int re_match | |
| 482 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string, | |
| 483 int length, int start, struct re_registers *regs)); | |
| 484 | |
| 485 | |
| 486 /* Relates to `re_match' as `re_search_2' relates to `re_search'. */ | |
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487 extern int re_match_2 |
| 14 | 488 _RE_ARGS ((struct re_pattern_buffer *buffer, const char *string1, |
| 489 int length1, const char *string2, int length2, | |
| 490 int start, struct re_registers *regs, int stop)); | |
| 491 | |
| 492 | |
| 493 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and | |
| 494 ENDS. Subsequent matches using BUFFER and REGS will use this memory | |
| 495 for recording register information. STARTS and ENDS must be | |
| 496 allocated with malloc, and must each be at least `NUM_REGS * sizeof | |
| 497 (regoff_t)' bytes long. | |
| 498 | |
| 499 If NUM_REGS == 0, then subsequent matches should allocate their own | |
| 500 register data. | |
| 501 | |
| 502 Unless this function is called, the first search or match using | |
| 503 PATTERN_BUFFER will allocate its own register data, without | |
| 504 freeing the old data. */ | |
| 505 extern void re_set_registers | |
| 506 _RE_ARGS ((struct re_pattern_buffer *buffer, struct re_registers *regs, | |
| 507 unsigned num_regs, regoff_t *starts, regoff_t *ends)); | |
| 508 | |
| 389 | 509 #ifdef _REGEX_RE_COMP |
| 1283 | 510 # ifndef _CRAY |
| 14 | 511 /* 4.2 bsd compatibility. */ |
| 512 extern char *re_comp _RE_ARGS ((const char *)); | |
| 513 extern int re_exec _RE_ARGS ((const char *)); | |
| 1283 | 514 # endif |
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515 #endif |
| 14 | 516 |
| 517 /* POSIX compatibility. */ | |
| 518 extern int regcomp _RE_ARGS ((regex_t *preg, const char *pattern, int cflags)); | |
| 519 extern int regexec | |
| 520 _RE_ARGS ((const regex_t *preg, const char *string, size_t nmatch, | |
| 521 regmatch_t pmatch[], int eflags)); | |
| 522 extern size_t regerror | |
| 523 _RE_ARGS ((int errcode, const regex_t *preg, char *errbuf, | |
| 524 size_t errbuf_size)); | |
| 525 extern void regfree _RE_ARGS ((regex_t *preg)); | |
| 526 | |
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527 |
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528 #ifdef __cplusplus |
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529 } |
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530 #endif /* C++ */ |
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531 |
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532 #endif /* regex.h */ |
| 14 | 533 |
| 534 /* | |
| 535 Local variables: | |
| 536 make-backup-files: t | |
| 537 version-control: t | |
| 538 trim-versions-without-asking: nil | |
| 539 End: | |
| 540 */ |