1 /* Definitions for data structures and routines for the regular 2 expression library. 3 Copyright (C) 1985, 1989-2022 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <https://www.gnu.org/licenses/>. */ 19 20 #ifndef _REGEX_H 21 #define _REGEX_H 1 22 23 #include <sys/types.h> 24 25 /* Allow the use in C++ code. */ 26 #ifdef __cplusplus 27 extern "C" { 28 #endif 29 30 /* Define __USE_GNU to declare GNU extensions that violate the 31 POSIX name space rules. */ 32 #ifdef _GNU_SOURCE 33 # define __USE_GNU 1 34 #endif 35 36 #ifdef _REGEX_LARGE_OFFSETS 37 38 /* Use types and values that are wide enough to represent signed and 39 unsigned byte offsets in memory. This currently works only when 40 the regex code is used outside of the GNU C library; it is not yet 41 supported within glibc itself, and glibc users should not define 42 _REGEX_LARGE_OFFSETS. */ 43 44 /* The type of object sizes. */ 45 typedef size_t __re_size_t; 46 47 /* The type of object sizes, in places where the traditional code 48 uses unsigned long int. */ 49 typedef size_t __re_long_size_t; 50 51 #else 52 53 /* The traditional GNU regex implementation mishandles strings longer 54 than INT_MAX. */ 55 typedef unsigned int __re_size_t; 56 typedef unsigned long int __re_long_size_t; 57 58 #endif 59 60 /* The following two types have to be signed and unsigned integer type 61 wide enough to hold a value of a pointer. For most ANSI compilers 62 ptrdiff_t and size_t should be likely OK. Still size of these two 63 types is 2 for Microsoft C. Ugh... */ 64 typedef long int s_reg_t; 65 typedef unsigned long int active_reg_t; 66 67 /* The following bits are used to determine the regexp syntax we 68 recognize. The set/not-set meanings are chosen so that Emacs syntax 69 remains the value 0. The bits are given in alphabetical order, and 70 the definitions shifted by one from the previous bit; thus, when we 71 add or remove a bit, only one other definition need change. */ 72 typedef unsigned long int reg_syntax_t; 73 74 #ifdef __USE_GNU 75 /* If this bit is not set, then \ inside a bracket expression is literal. 76 If set, then such a \ quotes the following character. */ 77 # define RE_BACKSLASH_ESCAPE_IN_LISTS ((unsigned long int) 1) 78 79 /* If this bit is not set, then + and ? are operators, and \+ and \? are 80 literals. 81 If set, then \+ and \? are operators and + and ? are literals. */ 82 # define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1) 83 84 /* If this bit is set, then character classes are supported. They are: 85 [:alpha:], [:upper:], [:lower:], [:digit:], [:alnum:], [:xdigit:], 86 [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:]. 87 If not set, then character classes are not supported. */ 88 # define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1) 89 90 /* If this bit is set, then ^ and $ are always anchors (outside bracket 91 expressions, of course). 92 If this bit is not set, then it depends: 93 ^ is an anchor if it is at the beginning of a regular 94 expression or after an open-group or an alternation operator; 95 $ is an anchor if it is at the end of a regular expression, or 96 before a close-group or an alternation operator. 97 98 This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because 99 POSIX draft 11.2 says that * etc. in leading positions is undefined. 100 We already implemented a previous draft which made those constructs 101 invalid, though, so we haven't changed the code back. */ 102 # define RE_CONTEXT_INDEP_ANCHORS (RE_CHAR_CLASSES << 1) 103 104 /* If this bit is set, then special characters are always special 105 regardless of where they are in the pattern. 106 If this bit is not set, then special characters are special only in 107 some contexts; otherwise they are ordinary. Specifically, 108 * + ? and intervals are only special when not after the beginning, 109 open-group, or alternation operator. */ 110 # define RE_CONTEXT_INDEP_OPS (RE_CONTEXT_INDEP_ANCHORS << 1) 111 112 /* If this bit is set, then *, +, ?, and { cannot be first in an re or 113 immediately after an alternation or begin-group operator. */ 114 # define RE_CONTEXT_INVALID_OPS (RE_CONTEXT_INDEP_OPS << 1) 115 116 /* If this bit is set, then . matches newline. 117 If not set, then it doesn't. */ 118 # define RE_DOT_NEWLINE (RE_CONTEXT_INVALID_OPS << 1) 119 120 /* If this bit is set, then . doesn't match NUL. 121 If not set, then it does. */ 122 # define RE_DOT_NOT_NULL (RE_DOT_NEWLINE << 1) 123 124 /* If this bit is set, nonmatching lists [^...] do not match newline. 125 If not set, they do. */ 126 # define RE_HAT_LISTS_NOT_NEWLINE (RE_DOT_NOT_NULL << 1) 127 128 /* If this bit is set, either \{...\} or {...} defines an 129 interval, depending on RE_NO_BK_BRACES. 130 If not set, \{, \}, {, and } are literals. */ 131 # define RE_INTERVALS (RE_HAT_LISTS_NOT_NEWLINE << 1) 132 133 /* If this bit is set, +, ? and | aren't recognized as operators. 134 If not set, they are. */ 135 # define RE_LIMITED_OPS (RE_INTERVALS << 1) 136 137 /* If this bit is set, newline is an alternation operator. 138 If not set, newline is literal. */ 139 # define RE_NEWLINE_ALT (RE_LIMITED_OPS << 1) 140 141 /* If this bit is set, then '{...}' defines an interval, and \{ and \} 142 are literals. 143 If not set, then '\{...\}' defines an interval. */ 144 # define RE_NO_BK_BRACES (RE_NEWLINE_ALT << 1) 145 146 /* If this bit is set, (...) defines a group, and \( and \) are literals. 147 If not set, \(...\) defines a group, and ( and ) are literals. */ 148 # define RE_NO_BK_PARENS (RE_NO_BK_BRACES << 1) 149 150 /* If this bit is set, then \<digit> matches <digit>. 151 If not set, then \<digit> is a back-reference. */ 152 # define RE_NO_BK_REFS (RE_NO_BK_PARENS << 1) 153 154 /* If this bit is set, then | is an alternation operator, and \| is literal. 155 If not set, then \| is an alternation operator, and | is literal. */ 156 # define RE_NO_BK_VBAR (RE_NO_BK_REFS << 1) 157 158 /* If this bit is set, then an ending range point collating higher 159 than the starting range point, as in [z-a], is invalid. 160 If not set, then when ending range point collates higher than the 161 starting range point, the range is ignored. */ 162 # define RE_NO_EMPTY_RANGES (RE_NO_BK_VBAR << 1) 163 164 /* If this bit is set, then an unmatched ) is ordinary. 165 If not set, then an unmatched ) is invalid. */ 166 # define RE_UNMATCHED_RIGHT_PAREN_ORD (RE_NO_EMPTY_RANGES << 1) 167 168 /* If this bit is set, succeed as soon as we match the whole pattern, 169 without further backtracking. */ 170 # define RE_NO_POSIX_BACKTRACKING (RE_UNMATCHED_RIGHT_PAREN_ORD << 1) 171 172 /* If this bit is set, do not process the GNU regex operators. 173 If not set, then the GNU regex operators are recognized. */ 174 # define RE_NO_GNU_OPS (RE_NO_POSIX_BACKTRACKING << 1) 175 176 /* If this bit is set, turn on internal regex debugging. 177 If not set, and debugging was on, turn it off. 178 This only works if regex.c is compiled -DDEBUG. 179 We define this bit always, so that all that's needed to turn on 180 debugging is to recompile regex.c; the calling code can always have 181 this bit set, and it won't affect anything in the normal case. */ 182 # define RE_DEBUG (RE_NO_GNU_OPS << 1) 183 184 /* If this bit is set, a syntactically invalid interval is treated as 185 a string of ordinary characters. For example, the ERE 'a{1' is 186 treated as 'a\{1'. */ 187 # define RE_INVALID_INTERVAL_ORD (RE_DEBUG << 1) 188 189 /* If this bit is set, then ignore case when matching. 190 If not set, then case is significant. */ 191 # define RE_ICASE (RE_INVALID_INTERVAL_ORD << 1) 192 193 /* This bit is used internally like RE_CONTEXT_INDEP_ANCHORS but only 194 for ^, because it is difficult to scan the regex backwards to find 195 whether ^ should be special. */ 196 # define RE_CARET_ANCHORS_HERE (RE_ICASE << 1) 197 198 /* If this bit is set, then \{ cannot be first in a regex or 199 immediately after an alternation, open-group or \} operator. */ 200 # define RE_CONTEXT_INVALID_DUP (RE_CARET_ANCHORS_HERE << 1) 201 202 /* If this bit is set, then no_sub will be set to 1 during 203 re_compile_pattern. */ 204 # define RE_NO_SUB (RE_CONTEXT_INVALID_DUP << 1) 205 #endif 206 207 /* This global variable defines the particular regexp syntax to use (for 208 some interfaces). When a regexp is compiled, the syntax used is 209 stored in the pattern buffer, so changing this does not affect 210 already-compiled regexps. */ 211 extern reg_syntax_t re_syntax_options; 212 213 #ifdef __USE_GNU 214 /* Define combinations of the above bits for the standard possibilities. 215 (The [[[ comments delimit what gets put into the Texinfo file, so 216 don't delete them!) */ 217 /* [[[begin syntaxes]]] */ 218 # define RE_SYNTAX_EMACS 0 219 220 # define RE_SYNTAX_AWK \ 221 (RE_BACKSLASH_ESCAPE_IN_LISTS | RE_DOT_NOT_NULL \ 222 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ 223 | RE_NO_BK_VBAR | RE_NO_EMPTY_RANGES \ 224 | RE_DOT_NEWLINE | RE_CONTEXT_INDEP_ANCHORS \ 225 | RE_CHAR_CLASSES \ 226 | RE_UNMATCHED_RIGHT_PAREN_ORD | RE_NO_GNU_OPS) 227 228 # define RE_SYNTAX_GNU_AWK \ 229 ((RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS \ 230 | RE_INVALID_INTERVAL_ORD) \ 231 & ~(RE_DOT_NOT_NULL | RE_CONTEXT_INDEP_OPS \ 232 | RE_CONTEXT_INVALID_OPS )) 233 234 # define RE_SYNTAX_POSIX_AWK \ 235 (RE_SYNTAX_POSIX_EXTENDED | RE_BACKSLASH_ESCAPE_IN_LISTS \ 236 | RE_INTERVALS | RE_NO_GNU_OPS \ 237 | RE_INVALID_INTERVAL_ORD) 238 239 # define RE_SYNTAX_GREP \ 240 ((RE_SYNTAX_POSIX_BASIC | RE_NEWLINE_ALT) \ 241 & ~(RE_CONTEXT_INVALID_DUP | RE_DOT_NOT_NULL)) 242 243 # define RE_SYNTAX_EGREP \ 244 ((RE_SYNTAX_POSIX_EXTENDED | RE_INVALID_INTERVAL_ORD | RE_NEWLINE_ALT) \ 245 & ~(RE_CONTEXT_INVALID_OPS | RE_DOT_NOT_NULL)) 246 247 /* POSIX grep -E behavior is no longer incompatible with GNU. */ 248 # define RE_SYNTAX_POSIX_EGREP \ 249 RE_SYNTAX_EGREP 250 251 /* P1003.2/D11.2, section 4.20.7.1, lines 5078ff. */ 252 # define RE_SYNTAX_ED RE_SYNTAX_POSIX_BASIC 253 254 # define RE_SYNTAX_SED RE_SYNTAX_POSIX_BASIC 255 256 /* Syntax bits common to both basic and extended POSIX regex syntax. */ 257 # define _RE_SYNTAX_POSIX_COMMON \ 258 (RE_CHAR_CLASSES | RE_DOT_NEWLINE | RE_DOT_NOT_NULL \ 259 | RE_INTERVALS | RE_NO_EMPTY_RANGES) 260 261 # define RE_SYNTAX_POSIX_BASIC \ 262 (_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM | RE_CONTEXT_INVALID_DUP) 263 264 /* Differs from ..._POSIX_BASIC only in that RE_BK_PLUS_QM becomes 265 RE_LIMITED_OPS, i.e., \? \+ \| are not recognized. Actually, this 266 isn't minimal, since other operators, such as \`, aren't disabled. */ 267 # define RE_SYNTAX_POSIX_MINIMAL_BASIC \ 268 (_RE_SYNTAX_POSIX_COMMON | RE_LIMITED_OPS) 269 270 # define RE_SYNTAX_POSIX_EXTENDED \ 271 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ 272 | RE_CONTEXT_INDEP_OPS | RE_NO_BK_BRACES \ 273 | RE_NO_BK_PARENS | RE_NO_BK_VBAR \ 274 | RE_CONTEXT_INVALID_OPS | RE_UNMATCHED_RIGHT_PAREN_ORD) 275 276 /* Differs from ..._POSIX_EXTENDED in that RE_CONTEXT_INDEP_OPS is 277 removed and RE_NO_BK_REFS is added. */ 278 # define RE_SYNTAX_POSIX_MINIMAL_EXTENDED \ 279 (_RE_SYNTAX_POSIX_COMMON | RE_CONTEXT_INDEP_ANCHORS \ 280 | RE_CONTEXT_INVALID_OPS | RE_NO_BK_BRACES \ 281 | RE_NO_BK_PARENS | RE_NO_BK_REFS \ 282 | RE_NO_BK_VBAR | RE_UNMATCHED_RIGHT_PAREN_ORD) 283 /* [[[end syntaxes]]] */ 284 285 /* Maximum number of duplicates an interval can allow. POSIX-conforming 286 systems might define this in <limits.h>, but we want our 287 value, so remove any previous define. */ 288 # ifdef _REGEX_INCLUDE_LIMITS_H 289 # include <limits.h> 290 # endif 291 # ifdef RE_DUP_MAX 292 # undef RE_DUP_MAX 293 # endif 294 295 /* RE_DUP_MAX is 2**15 - 1 because an earlier implementation stored 296 the counter as a 2-byte signed integer. This is no longer true, so 297 RE_DUP_MAX could be increased to (INT_MAX / 10 - 1), or to 298 ((SIZE_MAX - 9) / 10) if _REGEX_LARGE_OFFSETS is defined. 299 However, there would be a huge performance problem if someone 300 actually used a pattern like a\{214748363\}, so RE_DUP_MAX retains 301 its historical value. */ 302 # define RE_DUP_MAX (0x7fff) 303 #endif 304 305 306 /* POSIX 'cflags' bits (i.e., information for 'regcomp'). */ 307 308 /* If this bit is set, then use extended regular expression syntax. 309 If not set, then use basic regular expression syntax. */ 310 #define REG_EXTENDED 1 311 312 /* If this bit is set, then ignore case when matching. 313 If not set, then case is significant. */ 314 #define REG_ICASE (1 << 1) 315 316 /* If this bit is set, then anchors do not match at newline 317 characters in the string. 318 If not set, then anchors do match at newlines. */ 319 #define REG_NEWLINE (1 << 2) 320 321 /* If this bit is set, then report only success or fail in regexec. 322 If not set, then returns differ between not matching and errors. */ 323 #define REG_NOSUB (1 << 3) 324 325 326 /* POSIX 'eflags' bits (i.e., information for regexec). */ 327 328 /* If this bit is set, then the beginning-of-line operator doesn't match 329 the beginning of the string (presumably because it's not the 330 beginning of a line). 331 If not set, then the beginning-of-line operator does match the 332 beginning of the string. */ 333 #define REG_NOTBOL 1 334 335 /* Like REG_NOTBOL, except for the end-of-line. */ 336 #define REG_NOTEOL (1 << 1) 337 338 /* Use PMATCH[0] to delimit the start and end of the search in the 339 buffer. */ 340 #define REG_STARTEND (1 << 2) 341 342 343 /* If any error codes are removed, changed, or added, update the 344 '__re_error_msgid' table in regcomp.c. */ 345 346 typedef enum 347 { 348 _REG_ENOSYS = -1, /* This will never happen for this implementation. */ 349 _REG_NOERROR = 0, /* Success. */ 350 _REG_NOMATCH, /* Didn't find a match (for regexec). */ 351 352 /* POSIX regcomp return error codes. (In the order listed in the 353 standard.) */ 354 _REG_BADPAT, /* Invalid pattern. */ 355 _REG_ECOLLATE, /* Invalid collating element. */ 356 _REG_ECTYPE, /* Invalid character class name. */ 357 _REG_EESCAPE, /* Trailing backslash. */ 358 _REG_ESUBREG, /* Invalid back reference. */ 359 _REG_EBRACK, /* Unmatched left bracket. */ 360 _REG_EPAREN, /* Parenthesis imbalance. */ 361 _REG_EBRACE, /* Unmatched \{. */ 362 _REG_BADBR, /* Invalid contents of \{\}. */ 363 _REG_ERANGE, /* Invalid range end. */ 364 _REG_ESPACE, /* Ran out of memory. */ 365 _REG_BADRPT, /* No preceding re for repetition op. */ 366 367 /* Error codes we've added. */ 368 _REG_EEND, /* Premature end. */ 369 _REG_ESIZE, /* Too large (e.g., repeat count too large). */ 370 _REG_ERPAREN /* Unmatched ) or \); not returned from regcomp. */ 371 } reg_errcode_t; 372 373 #if defined _XOPEN_SOURCE || defined __USE_XOPEN2K 374 # define REG_ENOSYS _REG_ENOSYS 375 #endif 376 #define REG_NOERROR _REG_NOERROR 377 #define REG_NOMATCH _REG_NOMATCH 378 #define REG_BADPAT _REG_BADPAT 379 #define REG_ECOLLATE _REG_ECOLLATE 380 #define REG_ECTYPE _REG_ECTYPE 381 #define REG_EESCAPE _REG_EESCAPE 382 #define REG_ESUBREG _REG_ESUBREG 383 #define REG_EBRACK _REG_EBRACK 384 #define REG_EPAREN _REG_EPAREN 385 #define REG_EBRACE _REG_EBRACE 386 #define REG_BADBR _REG_BADBR 387 #define REG_ERANGE _REG_ERANGE 388 #define REG_ESPACE _REG_ESPACE 389 #define REG_BADRPT _REG_BADRPT 390 #define REG_EEND _REG_EEND 391 #define REG_ESIZE _REG_ESIZE 392 #define REG_ERPAREN _REG_ERPAREN 393 394 /* This data structure represents a compiled pattern. Before calling 395 the pattern compiler, the fields 'buffer', 'allocated', 'fastmap', 396 and 'translate' can be set. After the pattern has been compiled, 397 the fields 're_nsub', 'not_bol' and 'not_eol' are available. All 398 other fields are private to the regex routines. */ 399 400 #ifndef RE_TRANSLATE_TYPE 401 # define __RE_TRANSLATE_TYPE unsigned char * 402 # ifdef __USE_GNU 403 # define RE_TRANSLATE_TYPE __RE_TRANSLATE_TYPE 404 # endif 405 #endif 406 407 #ifdef __USE_GNU 408 # define __REPB_PREFIX(name) name 409 #else 410 # define __REPB_PREFIX(name) __##name 411 #endif 412 413 struct re_pattern_buffer 414 { 415 /* Space that holds the compiled pattern. The type 416 'struct re_dfa_t' is private and is not declared here. */ 417 struct re_dfa_t *__REPB_PREFIX(buffer); 418 419 /* Number of bytes to which 'buffer' points. */ 420 __re_long_size_t __REPB_PREFIX(allocated); 421 422 /* Number of bytes actually used in 'buffer'. */ 423 __re_long_size_t __REPB_PREFIX(used); 424 425 /* Syntax setting with which the pattern was compiled. */ 426 reg_syntax_t __REPB_PREFIX(syntax); 427 428 /* Pointer to a fastmap, if any, otherwise zero. re_search uses the 429 fastmap, if there is one, to skip over impossible starting points 430 for matches. */ 431 char *__REPB_PREFIX(fastmap); 432 433 /* Either a translate table to apply to all characters before 434 comparing them, or zero for no translation. The translation is 435 applied to a pattern when it is compiled and to a string when it 436 is matched. */ 437 __RE_TRANSLATE_TYPE __REPB_PREFIX(translate); 438 439 /* Number of subexpressions found by the compiler. */ 440 size_t re_nsub; 441 442 /* Zero if this pattern cannot match the empty string, one else. 443 Well, in truth it's used only in 're_search_2', to see whether or 444 not we should use the fastmap, so we don't set this absolutely 445 perfectly; see 're_compile_fastmap' (the "duplicate" case). */ 446 unsigned __REPB_PREFIX(can_be_null) : 1; 447 448 /* If REGS_UNALLOCATED, allocate space in the 'regs' structure 449 for 'max (RE_NREGS, re_nsub + 1)' groups. 450 If REGS_REALLOCATE, reallocate space if necessary. 451 If REGS_FIXED, use what's there. */ 452 #ifdef __USE_GNU 453 # define REGS_UNALLOCATED 0 454 # define REGS_REALLOCATE 1 455 # define REGS_FIXED 2 456 #endif 457 unsigned __REPB_PREFIX(regs_allocated) : 2; 458 459 /* Set to zero when 're_compile_pattern' compiles a pattern; set to 460 one by 're_compile_fastmap' if it updates the fastmap. */ 461 unsigned __REPB_PREFIX(fastmap_accurate) : 1; 462 463 /* If set, 're_match_2' does not return information about 464 subexpressions. */ 465 unsigned __REPB_PREFIX(no_sub) : 1; 466 467 /* If set, a beginning-of-line anchor doesn't match at the beginning 468 of the string. */ 469 unsigned __REPB_PREFIX(not_bol) : 1; 470 471 /* Similarly for an end-of-line anchor. */ 472 unsigned __REPB_PREFIX(not_eol) : 1; 473 474 /* If true, an anchor at a newline matches. */ 475 unsigned __REPB_PREFIX(newline_anchor) : 1; 476 }; 477 478 typedef struct re_pattern_buffer regex_t; 479 480 /* Type for byte offsets within the string. POSIX mandates this. */ 481 #ifdef _REGEX_LARGE_OFFSETS 482 /* POSIX 1003.1-2008 requires that regoff_t be at least as wide as 483 ptrdiff_t and ssize_t. We don't know of any hosts where ptrdiff_t 484 is wider than ssize_t, so ssize_t is safe. ptrdiff_t is not 485 visible here, so use ssize_t. */ 486 typedef ssize_t regoff_t; 487 #else 488 /* The traditional GNU regex implementation mishandles strings longer 489 than INT_MAX. */ 490 typedef int regoff_t; 491 #endif 492 493 494 #ifdef __USE_GNU 495 /* This is the structure we store register match data in. See 496 regex.texinfo for a full description of what registers match. */ 497 struct re_registers 498 { 499 __re_size_t num_regs; 500 regoff_t *start; 501 regoff_t *end; 502 }; 503 504 505 /* If 'regs_allocated' is REGS_UNALLOCATED in the pattern buffer, 506 're_match_2' returns information about at least this many registers 507 the first time a 'regs' structure is passed. */ 508 # ifndef RE_NREGS 509 # define RE_NREGS 30 510 # endif 511 #endif 512 513 514 /* POSIX specification for registers. Aside from the different names than 515 're_registers', POSIX uses an array of structures, instead of a 516 structure of arrays. */ 517 typedef struct 518 { 519 regoff_t rm_so; /* Byte offset from string's start to substring's start. */ 520 regoff_t rm_eo; /* Byte offset from string's start to substring's end. */ 521 } regmatch_t; 522 523 /* Declarations for routines. */ 524 525 #ifndef _REGEX_NELTS 526 # if (defined __STDC_VERSION__ && 199901L <= __STDC_VERSION__ \ 527 && !defined __STDC_NO_VLA__) 528 # define _REGEX_NELTS(n) n 529 # else 530 # define _REGEX_NELTS(n) 531 # endif 532 #endif 533 534 #if defined __GNUC__ && 4 < __GNUC__ + (6 <= __GNUC_MINOR__) 535 # pragma GCC diagnostic push 536 # pragma GCC diagnostic ignored "-Wvla" 537 #endif 538 539 #ifndef _Attr_access_ 540 # ifdef __attr_access 541 # define _Attr_access_(arg) __attr_access (arg) 542 # elif defined __GNUC__ && 10 <= __GNUC__ 543 # define _Attr_access_(x) __attribute__ ((__access__ x)) 544 # else 545 # define _Attr_access_(x) 546 # endif 547 #endif 548 549 #ifdef __USE_GNU 550 /* Sets the current default syntax to SYNTAX, and return the old syntax. 551 You can also simply assign to the 're_syntax_options' variable. */ 552 extern reg_syntax_t re_set_syntax (reg_syntax_t __syntax); 553 554 /* Compile the regular expression PATTERN, with length LENGTH 555 and syntax given by the global 're_syntax_options', into the buffer 556 BUFFER. Return NULL if successful, and an error string if not. 557 558 To free the allocated storage, you must call 'regfree' on BUFFER. 559 Note that the translate table must either have been initialized by 560 'regcomp', with a malloc'ed value, or set to NULL before calling 561 'regfree'. */ 562 extern const char *re_compile_pattern (const char *__pattern, size_t __length, 563 struct re_pattern_buffer *__buffer) 564 _Attr_access_ ((__read_only__, 1, 2)); 565 566 567 /* Compile a fastmap for the compiled pattern in BUFFER; used to 568 accelerate searches. Return 0 if successful and -2 if was an 569 internal error. */ 570 extern int re_compile_fastmap (struct re_pattern_buffer *__buffer); 571 572 573 /* Search in the string STRING (with length LENGTH) for the pattern 574 compiled into BUFFER. Start searching at position START, for RANGE 575 characters. Return the starting position of the match, -1 for no 576 match, or -2 for an internal error. Also return register 577 information in REGS (if REGS and BUFFER->no_sub are nonzero). */ 578 extern regoff_t re_search (struct re_pattern_buffer *__buffer, 579 const char *__String, regoff_t __length, 580 regoff_t __start, regoff_t __range, 581 struct re_registers *__regs) 582 _Attr_access_ ((__read_only__, 2, 3)); 583 584 585 /* Like 're_search', but search in the concatenation of STRING1 and 586 STRING2. Also, stop searching at index START + STOP. */ 587 extern regoff_t re_search_2 (struct re_pattern_buffer *__buffer, 588 const char *__string1, regoff_t __length1, 589 const char *__string2, regoff_t __length2, 590 regoff_t __start, regoff_t __range, 591 struct re_registers *__regs, 592 regoff_t __stop) 593 _Attr_access_ ((__read_only__, 2, 3)) 594 _Attr_access_ ((__read_only__, 4, 5)); 595 596 597 /* Like 're_search', but return how many characters in STRING the regexp 598 in BUFFER matched, starting at position START. */ 599 extern regoff_t re_match (struct re_pattern_buffer *__buffer, 600 const char *__String, regoff_t __length, 601 regoff_t __start, struct re_registers *__regs) 602 _Attr_access_ ((__read_only__, 2, 3)); 603 604 605 /* Relates to 're_match' as 're_search_2' relates to 're_search'. */ 606 extern regoff_t re_match_2 (struct re_pattern_buffer *__buffer, 607 const char *__string1, regoff_t __length1, 608 const char *__string2, regoff_t __length2, 609 regoff_t __start, struct re_registers *__regs, 610 regoff_t __stop) 611 _Attr_access_ ((__read_only__, 2, 3)) 612 _Attr_access_ ((__read_only__, 4, 5)); 613 614 615 /* Set REGS to hold NUM_REGS registers, storing them in STARTS and 616 ENDS. Subsequent matches using BUFFER and REGS will use this memory 617 for recording register information. STARTS and ENDS must be 618 allocated with malloc, and must each be at least 'NUM_REGS * sizeof 619 (regoff_t)' bytes long. 620 621 If NUM_REGS == 0, then subsequent matches should allocate their own 622 register data. 623 624 Unless this function is called, the first search or match using 625 BUFFER will allocate its own register data, without 626 freeing the old data. */ 627 extern void re_set_registers (struct re_pattern_buffer *__buffer, 628 struct re_registers *__regs, 629 __re_size_t __num_regs, 630 regoff_t *__starts, regoff_t *__ends); 631 #endif /* Use GNU */ 632 633 #if defined _REGEX_RE_COMP || (defined _LIBC && defined __USE_MISC) 634 /* 4.2 bsd compatibility. */ 635 extern char *re_comp (const char *); 636 extern int re_exec (const char *); 637 #endif 638 639 /* For plain 'restrict', use glibc's __restrict if defined. 640 Otherwise, GCC 2.95 and later have "__restrict"; C99 compilers have 641 "restrict", and "configure" may have defined "restrict". 642 Other compilers use __restrict, __restrict__, and _Restrict, and 643 'configure' might #define 'restrict' to those words, so pick a 644 different name. */ 645 #ifndef _Restrict_ 646 # if defined __restrict \ 647 || 2 < __GNUC__ + (95 <= __GNUC_MINOR__) \ 648 || __clang_major__ >= 3 649 # define _Restrict_ __restrict 650 # elif 199901L <= __STDC_VERSION__ || defined restrict 651 # define _Restrict_ restrict 652 # else 653 # define _Restrict_ 654 # endif 655 #endif 656 /* For the ISO C99 syntax 657 array_name[restrict] 658 use glibc's __restrict_arr if available. 659 Otherwise, GCC 3.1 and clang support this syntax (but not in C++ mode). 660 Other ISO C99 compilers support it as well. */ 661 #ifndef _Restrict_arr_ 662 # ifdef __restrict_arr 663 # define _Restrict_arr_ __restrict_arr 664 # elif ((199901L <= __STDC_VERSION__ \ 665 || 3 < __GNUC__ + (1 <= __GNUC_MINOR__) \ 666 || __clang_major__ >= 3) \ 667 && !defined __cplusplus) 668 # define _Restrict_arr_ _Restrict_ 669 # else 670 # define _Restrict_arr_ 671 # endif 672 #endif 673 674 /* POSIX compatibility. */ 675 extern int regcomp (regex_t *_Restrict_ __preg, 676 const char *_Restrict_ __pattern, 677 int __cflags); 678 679 extern int regexec (const regex_t *_Restrict_ __preg, 680 const char *_Restrict_ __String, size_t __nmatch, 681 regmatch_t __pmatch[_Restrict_arr_ 682 _REGEX_NELTS (__nmatch)], 683 int __eflags); 684 685 extern size_t regerror (int __errcode, const regex_t *_Restrict_ __preg, 686 char *_Restrict_ __errbuf, size_t __errbuf_size) 687 _Attr_access_ ((__write_only__, 3, 4)); 688 689 extern void regfree (regex_t *__preg); 690 691 #if defined __GNUC__ && 4 < __GNUC__ + (6 <= __GNUC_MINOR__) 692 # pragma GCC diagnostic pop 693 #endif 694 695 #ifdef __cplusplus 696 } 697 #endif /* C++ */ 698 699 #endif /* regex.h */ 700