| | 1 | /* |
| | 2 | * lexical analyzer |
| | 3 | * This file is #included by regcomp.c. |
| | 4 | * |
| | 5 | * Copyright (c) 1998, 1999 Henry Spencer. All rights reserved. |
| | 6 | * |
| | 7 | * Development of this software was funded, in part, by Cray Research Inc., |
| | 8 | * UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics |
| | 9 | * Corporation, none of whom are responsible for the results. The author |
| | 10 | * thanks all of them. |
| | 11 | * |
| | 12 | * Redistribution and use in source and binary forms -- with or without |
| | 13 | * modification -- are permitted for any purpose, provided that |
| | 14 | * redistributions in source form retain this entire copyright notice and |
| | 15 | * indicate the origin and nature of any modifications. |
| | 16 | * |
| | 17 | * I'd appreciate being given credit for this package in the documentation |
| | 18 | * of software which uses it, but that is not a requirement. |
| | 19 | * |
| | 20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| | 21 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
| | 22 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
| | 23 | * HENRY SPENCER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| | 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| | 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| | 26 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| | 27 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| | 28 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| | 29 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| | 30 | * |
| | 31 | * $Header$ |
| | 32 | * |
| | 33 | */ |
| | 34 | |
| | 35 | /* scanning macros (know about v) */ |
| | 36 | #define ATEOS() (v->now >= v->stop) |
| | 37 | #define HAVE(n) (v->stop - v->now >= (n)) |
| | 38 | #define NEXT1(c) (!ATEOS() && *v->now == CHR(c)) |
| | 39 | #define NEXT2(a,b) (HAVE(2) && *v->now == CHR(a) && *(v->now+1) == CHR(b)) |
| | 40 | #define NEXT3(a,b,c) (HAVE(3) && *v->now == CHR(a) && \ |
| | 41 | *(v->now+1) == CHR(b) && \ |
| | 42 | *(v->now+2) == CHR(c)) |
| | 43 | #define SET(c) (v->nexttype = (c)) |
| | 44 | #define SETV(c, n) (v->nexttype = (c), v->nextvalue = (n)) |
| | 45 | #define RET(c) return (SET(c), 1) |
| | 46 | #define RETV(c, n) return (SETV(c, n), 1) |
| | 47 | #define FAILW(e) return (ERR(e), 0) /* ERR does SET(EOS) */ |
| | 48 | #define LASTTYPE(t) (v->lasttype == (t)) |
| | 49 | |
| | 50 | /* lexical contexts */ |
| | 51 | #define L_ERE 1 /* mainline ERE/ARE */ |
| | 52 | #define L_BRE 2 /* mainline BRE */ |
| | 53 | #define L_Q 3 /* REG_QUOTE */ |
| | 54 | #define L_EBND 4 /* ERE/ARE bound */ |
| | 55 | #define L_BBND 5 /* BRE bound */ |
| | 56 | #define L_BRACK 6 /* brackets */ |
| | 57 | #define L_CEL 7 /* collating element */ |
| | 58 | #define L_ECL 8 /* equivalence class */ |
| | 59 | #define L_CCL 9 /* character class */ |
| | 60 | #define INTOCON(c) (v->lexcon = (c)) |
| | 61 | #define INCON(con) (v->lexcon == (con)) |
| | 62 | |
| | 63 | /* construct pointer past end of chr array */ |
| | 64 | #define ENDOF(array) ((array) + sizeof(array)/sizeof(chr)) |
| | 65 | |
| | 66 | /* |
| | 67 | * lexstart - set up lexical stuff, scan leading options |
| | 68 | */ |
| | 69 | static void |
| | 70 | lexstart(struct vars * v) |
| | 71 | { |
| | 72 | prefixes(v); /* may turn on new type bits etc. */ |
| | 73 | NOERR(); |
| | 74 | |
| | 75 | if (v->cflags & REG_QUOTE) |
| | 76 | { |
| | 77 | assert(!(v->cflags & (REG_ADVANCED | REG_EXPANDED | REG_NEWLINE))); |
| | 78 | INTOCON(L_Q); |
| | 79 | } |
| | 80 | else if (v->cflags & REG_EXTENDED) |
| | 81 | { |
| | 82 | assert(!(v->cflags & REG_QUOTE)); |
| | 83 | INTOCON(L_ERE); |
| | 84 | } |
| | 85 | else |
| | 86 | { |
| | 87 | assert(!(v->cflags & (REG_QUOTE | REG_ADVF))); |
| | 88 | INTOCON(L_BRE); |
| | 89 | } |
| | 90 | |
| | 91 | v->nexttype = EMPTY; /* remember we were at the start */ |
| | 92 | next(v); /* set up the first token */ |
| | 93 | } |
| | 94 | |
| | 95 | /* |
| | 96 | * prefixes - implement various special prefixes |
| | 97 | */ |
| | 98 | static void |
| | 99 | prefixes(struct vars * v) |
| | 100 | { |
| | 101 | /* literal string doesn't get any of this stuff */ |
| | 102 | if (v->cflags & REG_QUOTE) |
| | 103 | return; |
| | 104 | |
| | 105 | /* initial "***" gets special things */ |
| | 106 | if (HAVE(4) && NEXT3('*', '*', '*')) |
| | 107 | switch (*(v->now + 3)) |
| | 108 | { |
| | 109 | case CHR('?'): /* "***?" error, msg shows version */ |
| | 110 | ERR(REG_BADPAT); |
| | 111 | return; /* proceed no further */ |
| | 112 | break; |
| | 113 | case CHR('='): /* "***=" shifts to literal string */ |
| | 114 | NOTE(REG_UNONPOSIX); |
| | 115 | v->cflags |= REG_QUOTE; |
| | 116 | v->cflags &= ~(REG_ADVANCED | REG_EXPANDED | REG_NEWLINE); |
| | 117 | v->now += 4; |
| | 118 | return; /* and there can be no more prefixes */ |
| | 119 | break; |
| | 120 | case CHR(':'): /* "***:" shifts to AREs */ |
| | 121 | NOTE(REG_UNONPOSIX); |
| | 122 | v->cflags |= REG_ADVANCED; |
| | 123 | v->now += 4; |
| | 124 | break; |
| | 125 | default: /* otherwise *** is just an error */ |
| | 126 | ERR(REG_BADRPT); |
| | 127 | return; |
| | 128 | break; |
| | 129 | } |
| | 130 | |
| | 131 | /* BREs and EREs don't get embedded options */ |
| | 132 | if ((v->cflags & REG_ADVANCED) != REG_ADVANCED) |
| | 133 | return; |
| | 134 | |
| | 135 | /* embedded options (AREs only) */ |
| | 136 | if (HAVE(3) && NEXT2('(', '?') && iscalpha(*(v->now + 2))) |
| | 137 | { |
| | 138 | NOTE(REG_UNONPOSIX); |
| | 139 | v->now += 2; |
| | 140 | for (; !ATEOS() && iscalpha(*v->now); v->now++) |
| | 141 | switch (*v->now) |
| | 142 | { |
| | 143 | case CHR('b'): /* BREs (but why???) */ |
| | 144 | v->cflags &= ~(REG_ADVANCED | REG_QUOTE); |
| | 145 | break; |
| | 146 | case CHR('c'): /* case sensitive */ |
| | 147 | v->cflags &= ~REG_ICASE; |
| | 148 | break; |
| | 149 | case CHR('e'): /* plain EREs */ |
| | 150 | v->cflags |= REG_EXTENDED; |
| | 151 | v->cflags &= ~(REG_ADVF | REG_QUOTE); |
| | 152 | break; |
| | 153 | case CHR('i'): /* case insensitive */ |
| | 154 | v->cflags |= REG_ICASE; |
| | 155 | break; |
| | 156 | case CHR('m'): /* Perloid synonym for n */ |
| | 157 | case CHR('n'): /* \n affects ^ $ . [^ */ |
| | 158 | v->cflags |= REG_NEWLINE; |
| | 159 | break; |
| | 160 | case CHR('p'): /* ~Perl, \n affects . [^ */ |
| | 161 | v->cflags |= REG_NLSTOP; |
| | 162 | v->cflags &= ~REG_NLANCH; |
| | 163 | break; |
| | 164 | case CHR('q'): /* literal string */ |
| | 165 | v->cflags |= REG_QUOTE; |
| | 166 | v->cflags &= ~REG_ADVANCED; |
| | 167 | break; |
| | 168 | case CHR('s'): /* single line, \n ordinary */ |
| | 169 | v->cflags &= ~REG_NEWLINE; |
| | 170 | break; |
| | 171 | case CHR('t'): /* tight syntax */ |
| | 172 | v->cflags &= ~REG_EXPANDED; |
| | 173 | break; |
| | 174 | case CHR('w'): /* weird, \n affects ^ $ only */ |
| | 175 | v->cflags &= ~REG_NLSTOP; |
| | 176 | v->cflags |= REG_NLANCH; |
| | 177 | break; |
| | 178 | case CHR('x'): /* expanded syntax */ |
| | 179 | v->cflags |= REG_EXPANDED; |
| | 180 | break; |
| | 181 | default: |
| | 182 | ERR(REG_BADOPT); |
| | 183 | return; |
| | 184 | } |
| | 185 | if (!NEXT1(')')) |
| | 186 | { |
| | 187 | ERR(REG_BADOPT); |
| | 188 | return; |
| | 189 | } |
| | 190 | v->now++; |
| | 191 | if (v->cflags & REG_QUOTE) |
| | 192 | v->cflags &= ~(REG_EXPANDED | REG_NEWLINE); |
| | 193 | } |
| | 194 | } |
| | 195 | |
| | 196 | /* |
| | 197 | * lexnest - "call a subroutine", interpolating string at the lexical level |
| | 198 | * |
| | 199 | * Note, this is not a very general facility. There are a number of |
| | 200 | * implicit assumptions about what sorts of strings can be subroutines. |
| | 201 | */ |
| | 202 | static void |
| | 203 | lexnest(struct vars * v, |
| | 204 | chr *beginp, /* start of interpolation */ |
| | 205 | chr *endp) /* one past end of interpolation */ |
| | 206 | { |
| | 207 | assert(v->savenow == NULL); /* only one level of nesting */ |
| | 208 | v->savenow = v->now; |
| | 209 | v->savestop = v->stop; |
| | 210 | v->now = beginp; |
| | 211 | v->stop = endp; |
| | 212 | } |
| | 213 | |
| | 214 | /* |
| | 215 | * string constants to interpolate as expansions of things like \d |
| | 216 | */ |
| | 217 | static chr backd[] = { /* \d */ |
| | 218 | CHR('['), CHR('['), CHR(':'), |
| | 219 | CHR('d'), CHR('i'), CHR('g'), CHR('i'), CHR('t'), |
| | 220 | CHR(':'), CHR(']'), CHR(']') |
| | 221 | }; |
| | 222 | static chr backD[] = { /* \D */ |
| | 223 | CHR('['), CHR('^'), CHR('['), CHR(':'), |
| | 224 | CHR('d'), CHR('i'), CHR('g'), CHR('i'), CHR('t'), |
| | 225 | CHR(':'), CHR(']'), CHR(']') |
| | 226 | }; |
| | 227 | static chr brbackd[] = { /* \d within brackets */ |
| | 228 | CHR('['), CHR(':'), |
| | 229 | CHR('d'), CHR('i'), CHR('g'), CHR('i'), CHR('t'), |
| | 230 | CHR(':'), CHR(']') |
| | 231 | }; |
| | 232 | static chr backs[] = { /* \s */ |
| | 233 | CHR('['), CHR('['), CHR(':'), |
| | 234 | CHR('s'), CHR('p'), CHR('a'), CHR('c'), CHR('e'), |
| | 235 | CHR(':'), CHR(']'), CHR(']') |
| | 236 | }; |
| | 237 | static chr backS[] = { /* \S */ |
| | 238 | CHR('['), CHR('^'), CHR('['), CHR(':'), |
| | 239 | CHR('s'), CHR('p'), CHR('a'), CHR('c'), CHR('e'), |
| | 240 | CHR(':'), CHR(']'), CHR(']') |
| | 241 | }; |
| | 242 | static chr brbacks[] = { /* \s within brackets */ |
| | 243 | CHR('['), CHR(':'), |
| | 244 | CHR('s'), CHR('p'), CHR('a'), CHR('c'), CHR('e'), |
| | 245 | CHR(':'), CHR(']') |
| | 246 | }; |
| | 247 | static chr backw[] = { /* \w */ |
| | 248 | CHR('['), CHR('['), CHR(':'), |
| | 249 | CHR('a'), CHR('l'), CHR('n'), CHR('u'), CHR('m'), |
| | 250 | CHR(':'), CHR(']'), CHR('_'), CHR(']') |
| | 251 | }; |
| | 252 | static chr backW[] = { /* \W */ |
| | 253 | CHR('['), CHR('^'), CHR('['), CHR(':'), |
| | 254 | CHR('a'), CHR('l'), CHR('n'), CHR('u'), CHR('m'), |
| | 255 | CHR(':'), CHR(']'), CHR('_'), CHR(']') |
| | 256 | }; |
| | 257 | static chr brbackw[] = { /* \w within brackets */ |
| | 258 | CHR('['), CHR(':'), |
| | 259 | CHR('a'), CHR('l'), CHR('n'), CHR('u'), CHR('m'), |
| | 260 | CHR(':'), CHR(']'), CHR('_') |
| | 261 | }; |
| | 262 | |
| | 263 | /* |
| | 264 | * lexword - interpolate a bracket expression for word characters |
| | 265 | * Possibly ought to inquire whether there is a "word" character class. |
| | 266 | */ |
| | 267 | static void |
| | 268 | lexword(struct vars * v) |
| | 269 | { |
| | 270 | lexnest(v, backw, ENDOF(backw)); |
| | 271 | } |
| | 272 | |
| | 273 | /* |
| | 274 | * next - get next token |
| | 275 | */ |
| | 276 | static int /* 1 normal, 0 failure */ |
| | 277 | next(struct vars * v) |
| | 278 | { |
| | 279 | chr c; |
| | 280 | |
| | 281 | /* errors yield an infinite sequence of failures */ |
| | 282 | if (ISERR()) |
| | 283 | return 0; /* the error has set nexttype to EOS */ |
| | 284 | |
| | 285 | /* remember flavor of last token */ |
| | 286 | v->lasttype = v->nexttype; |
| | 287 | |
| | 288 | /* REG_BOSONLY */ |
| | 289 | if (v->nexttype == EMPTY && (v->cflags & REG_BOSONLY)) |
| | 290 | { |
| | 291 | /* at start of a REG_BOSONLY RE */ |
| | 292 | RETV(SBEGIN, 0); /* same as \A */ |
| | 293 | } |
| | 294 | |
| | 295 | /* if we're nested and we've hit end, return to outer level */ |
| | 296 | if (v->savenow != NULL && ATEOS()) |
| | 297 | { |
| | 298 | v->now = v->savenow; |
| | 299 | v->stop = v->savestop; |
| | 300 | v->savenow = v->savestop = NULL; |
| | 301 | } |
| | 302 | |
| | 303 | /* skip white space etc. if appropriate (not in literal or []) */ |
| | 304 | if (v->cflags & REG_EXPANDED) |
| | 305 | switch (v->lexcon) |
| | 306 | { |
| | 307 | case L_ERE: |
| | 308 | case L_BRE: |
| | 309 | case L_EBND: |
| | 310 | case L_BBND: |
| | 311 | skip(v); |
| | 312 | break; |
| | 313 | } |
| | 314 | |
| | 315 | /* handle EOS, depending on context */ |
| | 316 | if (ATEOS()) |
| | 317 | { |
| | 318 | switch (v->lexcon) |
| | 319 | { |
| | 320 | case L_ERE: |
| | 321 | case L_BRE: |
| | 322 | case L_Q: |
| | 323 | RET(EOS); |
| | 324 | break; |
| | 325 | case L_EBND: |
| | 326 | case L_BBND: |
| | 327 | FAILW(REG_EBRACE); |
| | 328 | break; |
| | 329 | case L_BRACK: |
| | 330 | case L_CEL: |
| | 331 | case L_ECL: |
| | 332 | case L_CCL: |
| | 333 | FAILW(REG_EBRACK); |
| | 334 | break; |
| | 335 | } |
| | 336 | assert(NOTREACHED); |
| | 337 | } |
| | 338 | |
| | 339 | /* okay, time to actually get a character */ |
| | 340 | c = *v->now++; |
| | 341 | |
| | 342 | /* deal with the easy contexts, punt EREs to code below */ |
| | 343 | switch (v->lexcon) |
| | 344 | { |
| | 345 | case L_BRE: /* punt BREs to separate function */ |
| | 346 | return brenext(v, c); |
| | 347 | break; |
| | 348 | case L_ERE: /* see below */ |
| | 349 | break; |
| | 350 | case L_Q: /* literal strings are easy */ |
| | 351 | RETV(PLAIN, c); |
| | 352 | break; |
| | 353 | case L_BBND: /* bounds are fairly simple */ |
| | 354 | case L_EBND: |
| | 355 | switch (c) |
| | 356 | { |
| | 357 | case CHR('0'): |
| | 358 | case CHR('1'): |
| | 359 | case CHR('2'): |
| | 360 | case CHR('3'): |
| | 361 | case CHR('4'): |
| | 362 | case CHR('5'): |
| | 363 | case CHR('6'): |
| | 364 | case CHR('7'): |
| | 365 | case CHR('8'): |
| | 366 | case CHR('9'): |
| | 367 | RETV(DIGIT, (chr) DIGITVAL(c)); |
| | 368 | break; |
| | 369 | case CHR(','): |
| | 370 | RET(','); |
| | 371 | break; |
| | 372 | case CHR('}'): /* ERE bound ends with } */ |
| | 373 | if (INCON(L_EBND)) |
| | 374 | { |
| | 375 | INTOCON(L_ERE); |
| | 376 | if ((v->cflags & REG_ADVF) && NEXT1('?')) |
| | 377 | { |
| | 378 | v->now++; |
| | 379 | NOTE(REG_UNONPOSIX); |
| | 380 | RETV('}', 0); |
| | 381 | } |
| | 382 | RETV('}', 1); |
| | 383 | } |
| | 384 | else |
| | 385 | FAILW(REG_BADBR); |
| | 386 | break; |
| | 387 | case CHR('\\'): /* BRE bound ends with \} */ |
| | 388 | if (INCON(L_BBND) && NEXT1('}')) |
| | 389 | { |
| | 390 | v->now++; |
| | 391 | INTOCON(L_BRE); |
| | 392 | RET('}'); |
| | 393 | } |
| | 394 | else |
| | 395 | FAILW(REG_BADBR); |
| | 396 | break; |
| | 397 | default: |
| | 398 | FAILW(REG_BADBR); |
| | 399 | break; |
| | 400 | } |
| | 401 | assert(NOTREACHED); |
| | 402 | break; |
| | 403 | case L_BRACK: /* brackets are not too hard */ |
| | 404 | switch (c) |
| | 405 | { |
| | 406 | case CHR(']'): |
| | 407 | if (LASTTYPE('[')) |
| | 408 | RETV(PLAIN, c); |
| | 409 | else |
| | 410 | { |
| | 411 | INTOCON((v->cflags & REG_EXTENDED) ? |
| | 412 | L_ERE : L_BRE); |
| | 413 | RET(']'); |
| | 414 | } |
| | 415 | break; |
| | 416 | case CHR('\\'): |
| | 417 | NOTE(REG_UBBS); |
| | 418 | if (!(v->cflags & REG_ADVF)) |
| | 419 | RETV(PLAIN, c); |
| | 420 | NOTE(REG_UNONPOSIX); |
| | 421 | if (ATEOS()) |
| | 422 | FAILW(REG_EESCAPE); |
| | 423 | (DISCARD) lexescape(v); |
| | 424 | switch (v->nexttype) |
| | 425 | { /* not all escapes okay here */ |
| | 426 | case PLAIN: |
| | 427 | return 1; |
| | 428 | break; |
| | 429 | case CCLASS: |
| | 430 | switch (v->nextvalue) |
| | 431 | { |
| | 432 | case 'd': |
| | 433 | lexnest(v, brbackd, ENDOF(brbackd)); |
| | 434 | break; |
| | 435 | case 's': |
| | 436 | lexnest(v, brbacks, ENDOF(brbacks)); |
| | 437 | break; |
| | 438 | case 'w': |
| | 439 | lexnest(v, brbackw, ENDOF(brbackw)); |
| | 440 | break; |
| | 441 | default: |
| | 442 | FAILW(REG_EESCAPE); |
| | 443 | break; |
| | 444 | } |
| | 445 | /* lexnest done, back up and try again */ |
| | 446 | v->nexttype = v->lasttype; |
| | 447 | return next(v); |
| | 448 | break; |
| | 449 | } |
| | 450 | /* not one of the acceptable escapes */ |
| | 451 | FAILW(REG_EESCAPE); |
| | 452 | break; |
| | 453 | case CHR('-'): |
| | 454 | if (LASTTYPE('[') || NEXT1(']')) |
| | 455 | RETV(PLAIN, c); |
| | 456 | else |
| | 457 | RETV(RANGE, c); |
| | 458 | break; |
| | 459 | case CHR('['): |
| | 460 | if (ATEOS()) |
| | 461 | FAILW(REG_EBRACK); |
| | 462 | switch (*v->now++) |
| | 463 | { |
| | 464 | case CHR('.'): |
| | 465 | INTOCON(L_CEL); |
| | 466 | /* might or might not be locale-specific */ |
| | 467 | RET(COLLEL); |
| | 468 | break; |
| | 469 | case CHR('='): |
| | 470 | INTOCON(L_ECL); |
| | 471 | NOTE(REG_ULOCALE); |
| | 472 | RET(ECLASS); |
| | 473 | break; |
| | 474 | case CHR(':'): |
| | 475 | INTOCON(L_CCL); |
| | 476 | NOTE(REG_ULOCALE); |
| | 477 | RET(CCLASS); |
| | 478 | break; |
| | 479 | default: /* oops */ |
| | 480 | v->now--; |
| | 481 | RETV(PLAIN, c); |
| | 482 | break; |
| | 483 | } |
| | 484 | assert(NOTREACHED); |
| | 485 | break; |
| | 486 | default: |
| | 487 | RETV(PLAIN, c); |
| | 488 | break; |
| | 489 | } |
| | 490 | assert(NOTREACHED); |
| | 491 | break; |
| | 492 | case L_CEL: /* collating elements are easy */ |
| | 493 | if (c == CHR('.') && NEXT1(']')) |
| | 494 | { |
| | 495 | v->now++; |
| | 496 | INTOCON(L_BRACK); |
| | 497 | RETV(END, '.'); |
| | 498 | } |
| | 499 | else |
| | 500 | RETV(PLAIN, c); |
| | 501 | break; |
| | 502 | case L_ECL: /* ditto equivalence classes */ |
| | 503 | if (c == CHR('=') && NEXT1(']')) |
| | 504 | { |
| | 505 | v->now++; |
| | 506 | INTOCON(L_BRACK); |
| | 507 | RETV(END, '='); |
| | 508 | } |
| | 509 | else |
| | 510 | RETV(PLAIN, c); |
| | 511 | break; |
| | 512 | case L_CCL: /* ditto character classes */ |
| | 513 | if (c == CHR(':') && NEXT1(']')) |
| | 514 | { |
| | 515 | v->now++; |
| | 516 | INTOCON(L_BRACK); |
| | 517 | RETV(END, ':'); |
| | 518 | } |
| | 519 | else |
| | 520 | RETV(PLAIN, c); |
| | 521 | break; |
| | 522 | default: |
| | 523 | assert(NOTREACHED); |
| | 524 | break; |
| | 525 | } |
| | 526 | |
| | 527 | /* that got rid of everything except EREs and AREs */ |
| | 528 | assert(INCON(L_ERE)); |
| | 529 | |
| | 530 | /* deal with EREs and AREs, except for backslashes */ |
| | 531 | switch (c) |
| | 532 | { |
| | 533 | case CHR('|'): |
| | 534 | RET('|'); |
| | 535 | break; |
| | 536 | case CHR('*'): |
| | 537 | if ((v->cflags & REG_ADVF) && NEXT1('?')) |
| | 538 | { |
| | 539 | v->now++; |
| | 540 | NOTE(REG_UNONPOSIX); |
| | 541 | RETV('*', 0); |
| | 542 | } |
| | 543 | RETV('*', 1); |
| | 544 | break; |
| | 545 | case CHR('+'): |
| | 546 | if ((v->cflags & REG_ADVF) && NEXT1('?')) |
| | 547 | { |
| | 548 | v->now++; |
| | 549 | NOTE(REG_UNONPOSIX); |
| | 550 | RETV('+', 0); |
| | 551 | } |
| | 552 | RETV('+', 1); |
| | 553 | break; |
| | 554 | case CHR('?'): |
| | 555 | if ((v->cflags & REG_ADVF) && NEXT1('?')) |
| | 556 | { |
| | 557 | v->now++; |
| | 558 | NOTE(REG_UNONPOSIX); |
| | 559 | RETV('?', 0); |
| | 560 | } |
| | 561 | RETV('?', 1); |
| | 562 | break; |
| | 563 | case CHR('{'): /* bounds start or plain character */ |
| | 564 | if (v->cflags & REG_EXPANDED) |
| | 565 | skip(v); |
| | 566 | if (ATEOS() || !iscdigit(*v->now)) |
| | 567 | { |
| | 568 | NOTE(REG_UBRACES); |
| | 569 | NOTE(REG_UUNSPEC); |
| | 570 | RETV(PLAIN, c); |
| | 571 | } |
| | 572 | else |
| | 573 | { |
| | 574 | NOTE(REG_UBOUNDS); |
| | 575 | INTOCON(L_EBND); |
| | 576 | RET('{'); |
| | 577 | } |
| | 578 | assert(NOTREACHED); |
| | 579 | break; |
| | 580 | case CHR('('): /* parenthesis, or advanced extension */ |
| | 581 | if ((v->cflags & REG_ADVF) && NEXT1('?')) |
| | 582 | { |
| | 583 | NOTE(REG_UNONPOSIX); |
| | 584 | v->now++; |
| | 585 | switch (*v->now++) |
| | 586 | { |
| | 587 | case CHR(':'): /* non-capturing paren */ |
| | 588 | RETV('(', 0); |
| | 589 | break; |
| | 590 | case CHR('#'): /* comment */ |
| | 591 | while (!ATEOS() && *v->now != CHR(')')) |
| | 592 | v->now++; |
| | 593 | if (!ATEOS()) |
| | 594 | v->now++; |
| | 595 | assert(v->nexttype == v->lasttype); |
| | 596 | return next(v); |
| | 597 | break; |
| | 598 | case CHR('='): /* positive lookahead */ |
| | 599 | NOTE(REG_ULOOKAHEAD); |
| | 600 | RETV(LACON, 1); |
| | 601 | break; |
| | 602 | case CHR('!'): /* negative lookahead */ |
| | 603 | NOTE(REG_ULOOKAHEAD); |
| | 604 | RETV(LACON, 0); |
| | 605 | break; |
| | 606 | default: |
| | 607 | FAILW(REG_BADRPT); |
| | 608 | break; |
| | 609 | } |
| | 610 | assert(NOTREACHED); |
| | 611 | } |
| | 612 | if (v->cflags & REG_NOSUB) |
| | 613 | RETV('(', 0); /* all parens non-capturing */ |
| | 614 | else |
| | 615 | RETV('(', 1); |
| | 616 | break; |
| | 617 | case CHR(')'): |
| | 618 | if (LASTTYPE('(')) |
| | 619 | NOTE(REG_UUNSPEC); |
| | 620 | RETV(')', c); |
| | 621 | break; |
| | 622 | case CHR('['): /* easy except for [[:<:]] and [[:>:]] */ |
| | 623 | if (HAVE(6) && *(v->now + 0) == CHR('[') && |
| | 624 | *(v->now + 1) == CHR(':') && |
| | 625 | (*(v->now + 2) == CHR('<') || |
| | 626 | *(v->now + 2) == CHR('>')) && |
| | 627 | *(v->now + 3) == CHR(':') && |
| | 628 | *(v->now + 4) == CHR(']') && |
| | 629 | *(v->now + 5) == CHR(']')) |
| | 630 | { |
| | 631 | c = *(v->now + 2); |
| | 632 | v->now += 6; |
| | 633 | NOTE(REG_UNONPOSIX); |
| | 634 | RET((c == CHR('<')) ? '<' : '>'); |
| | 635 | } |
| | 636 | INTOCON(L_BRACK); |
| | 637 | if (NEXT1('^')) |
| | 638 | { |
| | 639 | v->now++; |
| | 640 | RETV('[', 0); |
| | 641 | } |
| | 642 | RETV('[', 1); |
| | 643 | break; |
| | 644 | case CHR('.'): |
| | 645 | RET('.'); |
| | 646 | break; |
| | 647 | case CHR('^'): |
| | 648 | RET('^'); |
| | 649 | break; |
| | 650 | case CHR('$'): |
| | 651 | RET('$'); |
| | 652 | break; |
| | 653 | case CHR('\\'): /* mostly punt backslashes to code below */ |
| | 654 | if (ATEOS()) |
| | 655 | FAILW(REG_EESCAPE); |
| | 656 | break; |
| | 657 | default: /* ordinary character */ |
| | 658 | RETV(PLAIN, c); |
| | 659 | break; |
| | 660 | } |
| | 661 | |
| | 662 | /* ERE/ARE backslash handling; backslash already eaten */ |
| | 663 | assert(!ATEOS()); |
| | 664 | if (!(v->cflags & REG_ADVF)) |
| | 665 | { /* only AREs have non-trivial escapes */ |
| | 666 | if (iscalnum(*v->now)) |
| | 667 | { |
| | 668 | NOTE(REG_UBSALNUM); |
| | 669 | NOTE(REG_UUNSPEC); |
| | 670 | } |
| | 671 | RETV(PLAIN, *v->now++); |
| | 672 | } |
| | 673 | (DISCARD) lexescape(v); |
| | 674 | if (ISERR()) |
| | 675 | FAILW(REG_EESCAPE); |
| | 676 | if (v->nexttype == CCLASS) |
| | 677 | { /* fudge at lexical level */ |
| | 678 | switch (v->nextvalue) |
| | 679 | { |
| | 680 | case 'd': |
| | 681 | lexnest(v, backd, ENDOF(backd)); |
| | 682 | break; |
| | 683 | case 'D': |
| | 684 | lexnest(v, backD, ENDOF(backD)); |
| | 685 | break; |
| | 686 | case 's': |
| | 687 | lexnest(v, backs, ENDOF(backs)); |
| | 688 | break; |
| | 689 | case 'S': |
| | 690 | lexnest(v, backS, ENDOF(backS)); |
| | 691 | break; |
| | 692 | case 'w': |
| | 693 | lexnest(v, backw, ENDOF(backw)); |
| | 694 | break; |
| | 695 | case 'W': |
| | 696 | lexnest(v, backW, ENDOF(backW)); |
| | 697 | break; |
| | 698 | default: |
| | 699 | assert(NOTREACHED); |
| | 700 | FAILW(REG_ASSERT); |
| | 701 | break; |
| | 702 | } |
| | 703 | /* lexnest done, back up and try again */ |
| | 704 | v->nexttype = v->lasttype; |
| | 705 | return next(v); |
| | 706 | } |
| | 707 | /* otherwise, lexescape has already done the work */ |
| | 708 | return !ISERR(); |
| | 709 | } |
| | 710 | |
| | 711 | /* |
| | 712 | * lexescape - parse an ARE backslash escape (backslash already eaten) |
| | 713 | * Note slightly nonstandard use of the CCLASS type code. |
| | 714 | */ |
| | 715 | static int /* not actually used, but convenient for |
| | 716 | * RETV */ |
| | 717 | lexescape(struct vars * v) |
| | 718 | { |
| | 719 | chr c; |
| | 720 | static chr alert[] = { |
| | 721 | CHR('a'), CHR('l'), CHR('e'), CHR('r'), CHR('t') |
| | 722 | }; |
| | 723 | static chr esc[] = { |
| | 724 | CHR('E'), CHR('S'), CHR('C') |
| | 725 | }; |
| | 726 | chr *save; |
| | 727 | |
| | 728 | assert(v->cflags & REG_ADVF); |
| | 729 | |
| | 730 | assert(!ATEOS()); |
| | 731 | c = *v->now++; |
| | 732 | if (!iscalnum(c)) |
| | 733 | RETV(PLAIN, c); |
| | 734 | |
| | 735 | NOTE(REG_UNONPOSIX); |
| | 736 | switch (c) |
| | 737 | { |
| | 738 | case CHR('a'): |
| | 739 | RETV(PLAIN, chrnamed(v, alert, ENDOF(alert), CHR('\007'))); |
| | 740 | break; |
| | 741 | case CHR('A'): |
| | 742 | RETV(SBEGIN, 0); |
| | 743 | break; |
| | 744 | case CHR('b'): |
| | 745 | RETV(PLAIN, CHR('\b')); |
| | 746 | break; |
| | 747 | case CHR('B'): |
| | 748 | RETV(PLAIN, CHR('\\')); |
| | 749 | break; |
| | 750 | case CHR('c'): |
| | 751 | NOTE(REG_UUNPORT); |
| | 752 | if (ATEOS()) |
| | 753 | FAILW(REG_EESCAPE); |
| | 754 | RETV(PLAIN, (chr) (*v->now++ & 037)); |
| | 755 | break; |
| | 756 | case CHR('d'): |
| | 757 | NOTE(REG_ULOCALE); |
| | 758 | RETV(CCLASS, 'd'); |
| | 759 | break; |
| | 760 | case CHR('D'): |
| | 761 | NOTE(REG_ULOCALE); |
| | 762 | RETV(CCLASS, 'D'); |
| | 763 | break; |
| | 764 | case CHR('e'): |
| | 765 | NOTE(REG_UUNPORT); |
| | 766 | RETV(PLAIN, chrnamed(v, esc, ENDOF(esc), CHR('\033'))); |
| | 767 | break; |
| | 768 | case CHR('f'): |
| | 769 | RETV(PLAIN, CHR('\f')); |
| | 770 | break; |
| | 771 | case CHR('m'): |
| | 772 | RET('<'); |
| | 773 | break; |
| | 774 | case CHR('M'): |
| | 775 | RET('>'); |
| | 776 | break; |
| | 777 | case CHR('n'): |
| | 778 | RETV(PLAIN, CHR('\n')); |
| | 779 | break; |
| | 780 | case CHR('r'): |
| | 781 | RETV(PLAIN, CHR('\r')); |
| | 782 | break; |
| | 783 | case CHR('s'): |
| | 784 | NOTE(REG_ULOCALE); |
| | 785 | RETV(CCLASS, 's'); |
| | 786 | break; |
| | 787 | case CHR('S'): |
| | 788 | NOTE(REG_ULOCALE); |
| | 789 | RETV(CCLASS, 'S'); |
| | 790 | break; |
| | 791 | case CHR('t'): |
| | 792 | RETV(PLAIN, CHR('\t')); |
| | 793 | break; |
| | 794 | case CHR('u'): |
| | 795 | c = lexdigits(v, 16, 4, 4); |
| | 796 | if (ISERR()) |
| | 797 | FAILW(REG_EESCAPE); |
| | 798 | RETV(PLAIN, c); |
| | 799 | break; |
| | 800 | case CHR('U'): |
| | 801 | c = lexdigits(v, 16, 8, 8); |
| | 802 | if (ISERR()) |
| | 803 | FAILW(REG_EESCAPE); |
| | 804 | RETV(PLAIN, c); |
| | 805 | break; |
| | 806 | case CHR('v'): |
| | 807 | RETV(PLAIN, CHR('\v')); |
| | 808 | break; |
| | 809 | case CHR('w'): |
| | 810 | NOTE(REG_ULOCALE); |
| | 811 | RETV(CCLASS, 'w'); |
| | 812 | break; |
| | 813 | case CHR('W'): |
| | 814 | NOTE(REG_ULOCALE); |
| | 815 | RETV(CCLASS, 'W'); |
| | 816 | break; |
| | 817 | case CHR('x'): |
| | 818 | NOTE(REG_UUNPORT); |
| | 819 | c = lexdigits(v, 16, 1, 255); /* REs >255 long outside |
| | 820 | * spec */ |
| | 821 | if (ISERR()) |
| | 822 | FAILW(REG_EESCAPE); |
| | 823 | RETV(PLAIN, c); |
| | 824 | break; |
| | 825 | case CHR('y'): |
| | 826 | NOTE(REG_ULOCALE); |
| | 827 | RETV(WBDRY, 0); |
| | 828 | break; |
| | 829 | case CHR('Y'): |
| | 830 | NOTE(REG_ULOCALE); |
| | 831 | RETV(NWBDRY, 0); |
| | 832 | break; |
| | 833 | case CHR('Z'): |
| | 834 | RETV(SEND, 0); |
| | 835 | break; |
| | 836 | case CHR('1'): |
| | 837 | case CHR('2'): |
| | 838 | case CHR('3'): |
| | 839 | case CHR('4'): |
| | 840 | case CHR('5'): |
| | 841 | case CHR('6'): |
| | 842 | case CHR('7'): |
| | 843 | case CHR('8'): |
| | 844 | case CHR('9'): |
| | 845 | save = v->now; |
| | 846 | v->now--; /* put first digit back */ |
| | 847 | c = lexdigits(v, 10, 1, 255); /* REs >255 long outside |
| | 848 | * spec */ |
| | 849 | if (ISERR()) |
| | 850 | FAILW(REG_EESCAPE); |
| | 851 | /* ugly heuristic (first test is "exactly 1 digit?") */ |
| | 852 | if (v->now - save == 0 || (int) c <= v->nsubexp) |
| | 853 | { |
| | 854 | NOTE(REG_UBACKREF); |
| | 855 | RETV(BACKREF, (chr) c); |
| | 856 | } |
| | 857 | /* oops, doesn't look like it's a backref after all... */ |
| | 858 | v->now = save; |
| | 859 | /* and fall through into octal number */ |
| | 860 | case CHR('0'): |
| | 861 | NOTE(REG_UUNPORT); |
| | 862 | v->now--; /* put first digit back */ |
| | 863 | c = lexdigits(v, 8, 1, 3); |
| | 864 | if (ISERR()) |
| | 865 | FAILW(REG_EESCAPE); |
| | 866 | RETV(PLAIN, c); |
| | 867 | break; |
| | 868 | default: |
| | 869 | assert(iscalpha(c)); |
| | 870 | FAILW(REG_EESCAPE); /* unknown alphabetic escape */ |
| | 871 | break; |
| | 872 | } |
| | 873 | assert(NOTREACHED); |
| | 874 | } |
| | 875 | |
| | 876 | /* |
| | 877 | * lexdigits - slurp up digits and return chr value |
| | 878 | */ |
| | 879 | static chr /* chr value; errors signalled via ERR */ |
| | 880 | lexdigits(struct vars * v, |
| | 881 | int base, |
| | 882 | int minlen, |
| | 883 | int maxlen) |
| | 884 | { |
| | 885 | uchr n; /* unsigned to avoid overflow misbehavior */ |
| | 886 | int len; |
| | 887 | chr c; |
| | 888 | int d; |
| | 889 | const uchr ub = (uchr) base; |
| | 890 | |
| | 891 | n = 0; |
| | 892 | for (len = 0; len < maxlen && !ATEOS(); len++) |
| | 893 | { |
| | 894 | c = *v->now++; |
| | 895 | switch (c) |
| | 896 | { |
| | 897 | case CHR('0'): |
| | 898 | case CHR('1'): |
| | 899 | case CHR('2'): |
| | 900 | case CHR('3'): |
| | 901 | case CHR('4'): |
| | 902 | case CHR('5'): |
| | 903 | case CHR('6'): |
| | 904 | case CHR('7'): |
| | 905 | case CHR('8'): |
| | 906 | case CHR('9'): |
| | 907 | d = DIGITVAL(c); |
| | 908 | break; |
| | 909 | case CHR('a'): |
| | 910 | case CHR('A'): |
| | 911 | d = 10; |
| | 912 | break; |
| | 913 | case CHR('b'): |
| | 914 | case CHR('B'): |
| | 915 | d = 11; |
| | 916 | break; |
| | 917 | case CHR('c'): |
| | 918 | case CHR('C'): |
| | 919 | d = 12; |
| | 920 | break; |
| | 921 | case CHR('d'): |
| | 922 | case CHR('D'): |
| | 923 | d = 13; |
| | 924 | break; |
| | 925 | case CHR('e'): |
| | 926 | case CHR('E'): |
| | 927 | d = 14; |
| | 928 | break; |
| | 929 | case CHR('f'): |
| | 930 | case CHR('F'): |
| | 931 | d = 15; |
| | 932 | break; |
| | 933 | default: |
| | 934 | v->now--; /* oops, not a digit at all */ |
| | 935 | d = -1; |
| | 936 | break; |
| | 937 | } |
| | 938 | |
| | 939 | if (d >= base) |
| | 940 | { /* not a plausible digit */ |
| | 941 | v->now--; |
| | 942 | d = -1; |
| | 943 | } |
| | 944 | if (d < 0) |
| | 945 | break; /* NOTE BREAK OUT */ |
| | 946 | n = n * ub + (uchr) d; |
| | 947 | } |
| | 948 | if (len < minlen) |
| | 949 | ERR(REG_EESCAPE); |
| | 950 | |
| | 951 | return (chr) n; |
| | 952 | } |
| | 953 | |
| | 954 | /* |
| | 955 | * brenext - get next BRE token |
| | 956 | * |
| | 957 | * This is much like EREs except for all the stupid backslashes and the |
| | 958 | * context-dependency of some things. |
| | 959 | */ |
| | 960 | static int /* 1 normal, 0 failure */ |
| | 961 | brenext(struct vars * v, |
| | 962 | chr pc) |
| | 963 | { |
| | 964 | chr c = (chr) pc; |
| | 965 | |
| | 966 | switch (c) |
| | 967 | { |
| | 968 | case CHR('*'): |
| | 969 | if (LASTTYPE(EMPTY) || LASTTYPE('(') || LASTTYPE('^')) |
| | 970 | RETV(PLAIN, c); |
| | 971 | RET('*'); |
| | 972 | break; |
| | 973 | case CHR('['): |
| | 974 | if (HAVE(6) && *(v->now + 0) == CHR('[') && |
| | 975 | *(v->now + 1) == CHR(':') && |
| | 976 | (*(v->now + 2) == CHR('<') || |
| | 977 | *(v->now + 2) == CHR('>')) && |
| | 978 | *(v->now + 3) == CHR(':') && |
| | 979 | *(v->now + 4) == CHR(']') && |
| | 980 | *(v->now + 5) == CHR(']')) |
| | 981 | { |
| | 982 | c = *(v->now + 2); |
| | 983 | v->now += 6; |
| | 984 | NOTE(REG_UNONPOSIX); |
| | 985 | RET((c == CHR('<')) ? '<' : '>'); |
| | 986 | } |
| | 987 | INTOCON(L_BRACK); |
| | 988 | if (NEXT1('^')) |
| | 989 | { |
| | 990 | v->now++; |
| | 991 | RETV('[', 0); |
| | 992 | } |
| | 993 | RETV('[', 1); |
| | 994 | break; |
| | 995 | case CHR('.'): |
| | 996 | RET('.'); |
| | 997 | break; |
| | 998 | case CHR('^'): |
| | 999 | if (LASTTYPE(EMPTY)) |
| | 1000 | RET('^'); |
| | 1001 | if (LASTTYPE('(')) |
| | 1002 | { |
| | 1003 | NOTE(REG_UUNSPEC); |
| | 1004 | RET('^'); |
| | 1005 | } |
| | 1006 | RETV(PLAIN, c); |
| | 1007 | break; |
| | 1008 | case CHR('$'): |
| | 1009 | if (v->cflags & REG_EXPANDED) |
| | 1010 | skip(v); |
| | 1011 | if (ATEOS()) |
| | 1012 | RET('$'); |
| | 1013 | if (NEXT2('\\', ')')) |
| | 1014 | { |
| | 1015 | NOTE(REG_UUNSPEC); |
| | 1016 | RET('$'); |
| | 1017 | } |
| | 1018 | RETV(PLAIN, c); |
| | 1019 | break; |
| | 1020 | case CHR('\\'): |
| | 1021 | break; /* see below */ |
| | 1022 | default: |
| | 1023 | RETV(PLAIN, c); |
| | 1024 | break; |
| | 1025 | } |
| | 1026 | |
| | 1027 | assert(c == CHR('\\')); |
| | 1028 | |
| | 1029 | if (ATEOS()) |
| | 1030 | FAILW(REG_EESCAPE); |
| | 1031 | |
| | 1032 | c = *v->now++; |
| | 1033 | switch (c) |
| | 1034 | { |
| | 1035 | case CHR('{'): |
| | 1036 | INTOCON(L_BBND); |
| | 1037 | NOTE(REG_UBOUNDS); |
| | 1038 | RET('{'); |
| | 1039 | break; |
| | 1040 | case CHR('('): |
| | 1041 | RETV('(', 1); |
| | 1042 | break; |
| | 1043 | case CHR(')'): |
| | 1044 | RETV(')', c); |
| | 1045 | break; |
| | 1046 | case CHR('<'): |
| | 1047 | NOTE(REG_UNONPOSIX); |
| | 1048 | RET('<'); |
| | 1049 | break; |
| | 1050 | case CHR('>'): |
| | 1051 | NOTE(REG_UNONPOSIX); |
| | 1052 | RET('>'); |
| | 1053 | break; |
| | 1054 | case CHR('1'): |
| | 1055 | case CHR('2'): |
| | 1056 | case CHR('3'): |
| | 1057 | case CHR('4'): |
| | 1058 | case CHR('5'): |
| | 1059 | case CHR('6'): |
| | 1060 | case CHR('7'): |
| | 1061 | case CHR('8'): |
| | 1062 | case CHR('9'): |
| | 1063 | NOTE(REG_UBACKREF); |
| | 1064 | RETV(BACKREF, (chr) DIGITVAL(c)); |
| | 1065 | break; |
| | 1066 | default: |
| | 1067 | if (iscalnum(c)) |
| | 1068 | { |
| | 1069 | NOTE(REG_UBSALNUM); |
| | 1070 | NOTE(REG_UUNSPEC); |
| | 1071 | } |
| | 1072 | RETV(PLAIN, c); |
| | 1073 | break; |
| | 1074 | } |
| | 1075 | |
| | 1076 | assert(NOTREACHED); |
| | 1077 | } |
| | 1078 | |
| | 1079 | /* |
| | 1080 | * skip - skip white space and comments in expanded form |
| | 1081 | */ |
| | 1082 | static void |
| | 1083 | skip(struct vars * v) |
| | 1084 | { |
| | 1085 | chr *start = v->now; |
| | 1086 | |
| | 1087 | assert(v->cflags & REG_EXPANDED); |
| | 1088 | |
| | 1089 | for (;;) |
| | 1090 | { |
| | 1091 | while (!ATEOS() && iscspace(*v->now)) |
| | 1092 | v->now++; |
| | 1093 | if (ATEOS() || *v->now != CHR('#')) |
| | 1094 | break; /* NOTE BREAK OUT */ |
| | 1095 | assert(NEXT1('#')); |
| | 1096 | while (!ATEOS() && *v->now != CHR('\n')) |
| | 1097 | v->now++; |
| | 1098 | /* leave the newline to be picked up by the iscspace loop */ |
| | 1099 | } |
| | 1100 | |
| | 1101 | if (v->now != start) |
| | 1102 | NOTE(REG_UNONPOSIX); |
| | 1103 | } |
| | 1104 | |
| | 1105 | /* |
| | 1106 | * newline - return the chr for a newline |
| | 1107 | * |
| | 1108 | * This helps confine use of CHR to this source file. |
| | 1109 | */ |
| | 1110 | static chr |
| | 1111 | newline(void) |
| | 1112 | { |
| | 1113 | return CHR('\n'); |
| | 1114 | } |
| | 1115 | |
| | 1116 | /* |
| | 1117 | * chrnamed - return the chr known by a given (chr string) name |
| | 1118 | * |
| | 1119 | * The code is a bit clumsy, but this routine gets only such specialized |
| | 1120 | * use that it hardly matters. |
| | 1121 | */ |
| | 1122 | static chr |
| | 1123 | chrnamed(struct vars * v, |
| | 1124 | chr *startp, /* start of name */ |
| | 1125 | chr *endp, /* just past end of name */ |
| | 1126 | chr lastresort) /* what to return if name lookup fails */ |
| | 1127 | { |
| | 1128 | celt c; |
| | 1129 | int errsave; |
| | 1130 | int e; |
| | 1131 | struct cvec *cv; |
| | 1132 | |
| | 1133 | errsave = v->err; |
| | 1134 | v->err = 0; |
| | 1135 | c = element(v, startp, endp); |
| | 1136 | e = v->err; |
| | 1137 | v->err = errsave; |
| | 1138 | |
| | 1139 | if (e != 0) |
| | 1140 | return (chr) lastresort; |
| | 1141 | |
| | 1142 | cv = range(v, c, c, 0); |
| | 1143 | if (cv->nchrs == 0) |
| | 1144 | return (chr) lastresort; |
| | 1145 | return cv->chrs[0]; |
| | 1146 | } |
projects / wxWidgets.git / blame_incremental