Commit | Line | Data |
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a687059c LW |
1 | /* NOTE: this is derived from Henry Spencer's regexp code, and should not |
2 | * confused with the original package (see point 3 below). Thanks, Henry! | |
3 | */ | |
4 | ||
5 | /* Additional note: this code is very heavily munged from Henry's version | |
6 | * in places. In some spots I've traded clarity for efficiency, so don't | |
7 | * blame Henry for some of the lack of readability. | |
8 | */ | |
9 | ||
35c8bce7 | 10 | /* $RCSfile: regcomp.c,v $$Revision: 4.0.1.1 $$Date: 91/04/12 09:04:45 $ |
a687059c LW |
11 | * |
12 | * $Log: regcomp.c,v $ | |
35c8bce7 LW |
13 | * Revision 4.0.1.1 91/04/12 09:04:45 lwall |
14 | * patch1: random cleanup in cpp namespace | |
15 | * | |
fe14fcc3 LW |
16 | * Revision 4.0 91/03/20 01:39:01 lwall |
17 | * 4.0 baseline. | |
a687059c LW |
18 | * |
19 | */ | |
20 | ||
21 | /* | |
22 | * regcomp and regexec -- regsub and regerror are not used in perl | |
23 | * | |
24 | * Copyright (c) 1986 by University of Toronto. | |
25 | * Written by Henry Spencer. Not derived from licensed software. | |
26 | * | |
27 | * Permission is granted to anyone to use this software for any | |
28 | * purpose on any computer system, and to redistribute it freely, | |
29 | * subject to the following restrictions: | |
30 | * | |
31 | * 1. The author is not responsible for the consequences of use of | |
32 | * this software, no matter how awful, even if they arise | |
33 | * from defects in it. | |
34 | * | |
35 | * 2. The origin of this software must not be misrepresented, either | |
36 | * by explicit claim or by omission. | |
37 | * | |
38 | * 3. Altered versions must be plainly marked as such, and must not | |
39 | * be misrepresented as being the original software. | |
40 | * | |
41 | * | |
42 | **** Alterations to Henry's code are... | |
43 | **** | |
44 | **** Copyright (c) 1989, Larry Wall | |
45 | **** | |
46 | **** You may distribute under the terms of the GNU General Public License | |
47 | **** as specified in the README file that comes with the perl 3.0 kit. | |
48 | * | |
49 | * Beware that some of this code is subtly aware of the way operator | |
50 | * precedence is structured in regular expressions. Serious changes in | |
51 | * regular-expression syntax might require a total rethink. | |
52 | */ | |
53 | #include "EXTERN.h" | |
54 | #include "perl.h" | |
55 | #include "INTERN.h" | |
56 | #include "regcomp.h" | |
57 | ||
fe14fcc3 LW |
58 | #ifdef MSDOS |
59 | # if defined(BUGGY_MSC6) | |
60 | /* MSC 6.00A breaks on op/regexp.t test 85 unless we turn this off */ | |
61 | # pragma optimize("a",off) | |
62 | /* But MSC 6.00A is happy with 'w', for aliases only across function calls*/ | |
63 | # pragma optimize("w",on ) | |
64 | # endif /* BUGGY_MSC6 */ | |
65 | #endif /* MSDOS */ | |
66 | ||
a687059c LW |
67 | #ifndef STATIC |
68 | #define STATIC static | |
69 | #endif | |
70 | ||
71 | #define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?') | |
72 | #define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \ | |
73 | ((*s) == '{' && regcurly(s))) | |
74 | #define META "^$.[()|?+*\\" | |
75 | ||
35c8bce7 LW |
76 | #ifdef SPSTART |
77 | #undef SPSTART /* dratted cpp namespace... */ | |
78 | #endif | |
a687059c LW |
79 | /* |
80 | * Flags to be passed up and down. | |
81 | */ | |
82 | #define HASWIDTH 01 /* Known never to match null string. */ | |
83 | #define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */ | |
84 | #define SPSTART 04 /* Starts with * or +. */ | |
85 | #define WORST 0 /* Worst case. */ | |
86 | ||
87 | /* | |
88 | * Global work variables for regcomp(). | |
89 | */ | |
90 | static char *regprecomp; /* uncompiled string. */ | |
91 | static char *regparse; /* Input-scan pointer. */ | |
92 | static char *regxend; /* End of input for compile */ | |
93 | static int regnpar; /* () count. */ | |
94 | static char *regcode; /* Code-emit pointer; ®dummy = don't. */ | |
95 | static long regsize; /* Code size. */ | |
96 | static int regfold; | |
97 | static int regsawbracket; /* Did we do {d,d} trick? */ | |
98 | ||
99 | /* | |
100 | * Forward declarations for regcomp()'s friends. | |
101 | */ | |
102 | STATIC int regcurly(); | |
103 | STATIC char *reg(); | |
104 | STATIC char *regbranch(); | |
105 | STATIC char *regpiece(); | |
106 | STATIC char *regatom(); | |
107 | STATIC char *regclass(); | |
108 | STATIC char *regnode(); | |
fe14fcc3 | 109 | STATIC char *reganode(); |
a687059c LW |
110 | STATIC void regc(); |
111 | STATIC void reginsert(); | |
112 | STATIC void regtail(); | |
113 | STATIC void regoptail(); | |
114 | ||
115 | /* | |
116 | - regcomp - compile a regular expression into internal code | |
117 | * | |
118 | * We can't allocate space until we know how big the compiled form will be, | |
119 | * but we can't compile it (and thus know how big it is) until we've got a | |
120 | * place to put the code. So we cheat: we compile it twice, once with code | |
121 | * generation turned off and size counting turned on, and once "for real". | |
122 | * This also means that we don't allocate space until we are sure that the | |
123 | * thing really will compile successfully, and we never have to move the | |
124 | * code and thus invalidate pointers into it. (Note that it has to be in | |
125 | * one piece because free() must be able to free it all.) [NB: not true in perl] | |
126 | * | |
127 | * Beware that the optimization-preparation code in here knows about some | |
128 | * of the structure of the compiled regexp. [I'll say.] | |
129 | */ | |
130 | regexp * | |
00bf170e | 131 | regcomp(exp,xend,fold) |
a687059c LW |
132 | char *exp; |
133 | char *xend; | |
134 | int fold; | |
a687059c LW |
135 | { |
136 | register regexp *r; | |
137 | register char *scan; | |
0a12ae7d LW |
138 | register STR *longish; |
139 | STR *longest; | |
a687059c LW |
140 | register int len; |
141 | register char *first; | |
142 | int flags; | |
34de22dd LW |
143 | int backish; |
144 | int backest; | |
a687059c LW |
145 | int curback; |
146 | extern char *safemalloc(); | |
147 | extern char *savestr(); | |
00bf170e | 148 | int sawplus = 0; |
a687059c LW |
149 | |
150 | if (exp == NULL) | |
151 | fatal("NULL regexp argument"); | |
152 | ||
153 | /* First pass: determine size, legality. */ | |
154 | regfold = fold; | |
155 | regparse = exp; | |
156 | regxend = xend; | |
157 | regprecomp = nsavestr(exp,xend-exp); | |
158 | regsawbracket = 0; | |
159 | regnpar = 1; | |
160 | regsize = 0L; | |
161 | regcode = ®dummy; | |
162 | regc(MAGIC); | |
163 | if (reg(0, &flags) == NULL) { | |
164 | Safefree(regprecomp); | |
fe14fcc3 | 165 | regprecomp = Nullch; |
a687059c LW |
166 | return(NULL); |
167 | } | |
168 | ||
169 | /* Small enough for pointer-storage convention? */ | |
170 | if (regsize >= 32767L) /* Probably could be 65535L. */ | |
171 | FAIL("regexp too big"); | |
172 | ||
173 | /* Allocate space. */ | |
174 | Newc(1001, r, sizeof(regexp) + (unsigned)regsize, char, regexp); | |
175 | if (r == NULL) | |
176 | FAIL("regexp out of space"); | |
177 | ||
178 | /* Second pass: emit code. */ | |
179 | if (regsawbracket) | |
180 | bcopy(regprecomp,exp,xend-exp); | |
181 | r->precomp = regprecomp; | |
182 | r->subbase = NULL; | |
183 | regparse = exp; | |
184 | regnpar = 1; | |
185 | regcode = r->program; | |
186 | regc(MAGIC); | |
187 | if (reg(0, &flags) == NULL) | |
188 | return(NULL); | |
189 | ||
190 | /* Dig out information for optimizations. */ | |
191 | r->regstart = Nullstr; /* Worst-case defaults. */ | |
192 | r->reganch = 0; | |
193 | r->regmust = Nullstr; | |
194 | r->regback = -1; | |
195 | r->regstclass = Nullch; | |
196 | scan = r->program+1; /* First BRANCH. */ | |
197 | if (OP(regnext(scan)) == END) {/* Only one top-level choice. */ | |
198 | scan = NEXTOPER(scan); | |
199 | ||
200 | first = scan; | |
fe14fcc3 | 201 | while (OP(first) == OPEN || |
a687059c | 202 | (OP(first) == BRANCH && OP(regnext(first)) != BRANCH) || |
00bf170e LW |
203 | (OP(first) == PLUS) || |
204 | (OP(first) == CURLY && ARG1(first) > 0) ) { | |
fe14fcc3 | 205 | if (OP(first) == PLUS) |
00bf170e | 206 | sawplus = 2; |
fe14fcc3 LW |
207 | else |
208 | first += regarglen[OP(first)]; | |
a687059c | 209 | first = NEXTOPER(first); |
00bf170e | 210 | } |
a687059c LW |
211 | |
212 | /* Starting-point info. */ | |
213 | if (OP(first) == EXACTLY) { | |
214 | r->regstart = | |
215 | str_make(OPERAND(first)+1,*OPERAND(first)); | |
216 | if (r->regstart->str_cur > !(sawstudy|fold)) | |
217 | fbmcompile(r->regstart,fold); | |
218 | } | |
219 | else if ((exp = index(simple,OP(first))) && exp > simple) | |
220 | r->regstclass = first; | |
221 | else if (OP(first) == BOUND || OP(first) == NBOUND) | |
222 | r->regstclass = first; | |
00bf170e LW |
223 | else if (OP(first) == BOL || |
224 | (OP(first) == STAR && OP(NEXTOPER(first)) == ANY) ) | |
225 | r->reganch = 1; /* kinda turn .* into ^.* */ | |
226 | r->reganch |= sawplus; | |
a687059c LW |
227 | |
228 | #ifdef DEBUGGING | |
229 | if (debug & 512) | |
230 | fprintf(stderr,"first %d next %d offset %d\n", | |
231 | OP(first), OP(NEXTOPER(first)), first - scan); | |
232 | #endif | |
233 | /* | |
234 | * If there's something expensive in the r.e., find the | |
235 | * longest literal string that must appear and make it the | |
236 | * regmust. Resolve ties in favor of later strings, since | |
237 | * the regstart check works with the beginning of the r.e. | |
238 | * and avoiding duplication strengthens checking. Not a | |
239 | * strong reason, but sufficient in the absence of others. | |
240 | * [Now we resolve ties in favor of the earlier string if | |
241 | * it happens that curback has been invalidated, since the | |
242 | * earlier string may buy us something the later one won't.] | |
243 | */ | |
0a12ae7d | 244 | longish = str_make("",0); |
a687059c LW |
245 | longest = str_make("",0); |
246 | len = 0; | |
247 | curback = 0; | |
34de22dd LW |
248 | backish = 0; |
249 | backest = 0; | |
e5d73d77 | 250 | while (OP(scan) != END) { |
a687059c LW |
251 | if (OP(scan) == BRANCH) { |
252 | if (OP(regnext(scan)) == BRANCH) { | |
253 | curback = -30000; | |
254 | while (OP(scan) == BRANCH) | |
255 | scan = regnext(scan); | |
256 | } | |
257 | else /* single branch is ok */ | |
258 | scan = NEXTOPER(scan); | |
259 | } | |
260 | if (OP(scan) == EXACTLY) { | |
fe14fcc3 LW |
261 | char *t; |
262 | ||
a687059c | 263 | first = scan; |
fe14fcc3 LW |
264 | while (OP(t = regnext(scan)) == CLOSE) |
265 | scan = t; | |
34de22dd | 266 | if (curback - backish == len) { |
0a12ae7d | 267 | str_ncat(longish, OPERAND(first)+1, |
a687059c LW |
268 | *OPERAND(first)); |
269 | len += *OPERAND(first); | |
270 | curback += *OPERAND(first); | |
271 | first = regnext(scan); | |
272 | } | |
273 | else if (*OPERAND(first) >= len + (curback >= 0)) { | |
274 | len = *OPERAND(first); | |
0a12ae7d | 275 | str_nset(longish, OPERAND(first)+1,len); |
34de22dd | 276 | backish = curback; |
a687059c LW |
277 | curback += len; |
278 | first = regnext(scan); | |
279 | } | |
280 | else | |
281 | curback += *OPERAND(first); | |
282 | } | |
0a12ae7d LW |
283 | else if (index(varies,OP(scan))) { |
284 | curback = -30000; | |
285 | len = 0; | |
34de22dd | 286 | if (longish->str_cur > longest->str_cur) { |
0a12ae7d | 287 | str_sset(longest,longish); |
34de22dd LW |
288 | backest = backish; |
289 | } | |
0a12ae7d LW |
290 | str_nset(longish,"",0); |
291 | } | |
e5d73d77 | 292 | else if (index(simple,OP(scan))) { |
0a12ae7d | 293 | curback++; |
e5d73d77 | 294 | len = 0; |
34de22dd | 295 | if (longish->str_cur > longest->str_cur) { |
e5d73d77 | 296 | str_sset(longest,longish); |
34de22dd LW |
297 | backest = backish; |
298 | } | |
e5d73d77 LW |
299 | str_nset(longish,"",0); |
300 | } | |
a687059c LW |
301 | scan = regnext(scan); |
302 | } | |
e5d73d77 LW |
303 | |
304 | /* Prefer earlier on tie, unless we can tail match latter */ | |
305 | ||
34de22dd | 306 | if (longish->str_cur + (OP(first) == EOL) > longest->str_cur) { |
0a12ae7d | 307 | str_sset(longest,longish); |
34de22dd LW |
308 | backest = backish; |
309 | } | |
e5d73d77 LW |
310 | else |
311 | str_nset(longish,"",0); | |
34de22dd LW |
312 | if (longest->str_cur |
313 | && | |
314 | (!r->regstart | |
315 | || | |
316 | !fbminstr(r->regstart->str_ptr, | |
317 | r->regstart->str_ptr + r->regstart->str_cur, | |
318 | longest) | |
319 | ) | |
320 | ) | |
321 | { | |
a687059c | 322 | r->regmust = longest; |
34de22dd LW |
323 | if (backest < 0) |
324 | backest = -1; | |
325 | r->regback = backest; | |
0a12ae7d LW |
326 | if (longest->str_cur |
327 | > !(sawstudy || fold || OP(first) == EOL) ) | |
a687059c LW |
328 | fbmcompile(r->regmust,fold); |
329 | r->regmust->str_u.str_useful = 100; | |
e5d73d77 | 330 | if (OP(first) == EOL && longish->str_cur) |
a687059c LW |
331 | r->regmust->str_pok |= SP_TAIL; |
332 | } | |
fe14fcc3 | 333 | else { |
a687059c | 334 | str_free(longest); |
fe14fcc3 LW |
335 | longest = Nullstr; |
336 | } | |
e5d73d77 | 337 | str_free(longish); |
a687059c LW |
338 | } |
339 | ||
340 | r->do_folding = fold; | |
341 | r->nparens = regnpar - 1; | |
fe14fcc3 LW |
342 | New(1002, r->startp, regnpar, char*); |
343 | New(1002, r->endp, regnpar, char*); | |
a687059c LW |
344 | #ifdef DEBUGGING |
345 | if (debug & 512) | |
346 | regdump(r); | |
347 | #endif | |
348 | return(r); | |
349 | } | |
350 | ||
351 | /* | |
352 | - reg - regular expression, i.e. main body or parenthesized thing | |
353 | * | |
354 | * Caller must absorb opening parenthesis. | |
355 | * | |
356 | * Combining parenthesis handling with the base level of regular expression | |
357 | * is a trifle forced, but the need to tie the tails of the branches to what | |
358 | * follows makes it hard to avoid. | |
359 | */ | |
360 | static char * | |
361 | reg(paren, flagp) | |
362 | int paren; /* Parenthesized? */ | |
363 | int *flagp; | |
364 | { | |
365 | register char *ret; | |
366 | register char *br; | |
367 | register char *ender; | |
368 | register int parno; | |
369 | int flags; | |
370 | ||
371 | *flagp = HASWIDTH; /* Tentatively. */ | |
372 | ||
373 | /* Make an OPEN node, if parenthesized. */ | |
374 | if (paren) { | |
a687059c LW |
375 | parno = regnpar; |
376 | regnpar++; | |
fe14fcc3 | 377 | ret = reganode(OPEN, parno); |
a687059c LW |
378 | } else |
379 | ret = NULL; | |
380 | ||
381 | /* Pick up the branches, linking them together. */ | |
382 | br = regbranch(&flags); | |
383 | if (br == NULL) | |
384 | return(NULL); | |
385 | if (ret != NULL) | |
386 | regtail(ret, br); /* OPEN -> first. */ | |
387 | else | |
388 | ret = br; | |
389 | if (!(flags&HASWIDTH)) | |
390 | *flagp &= ~HASWIDTH; | |
391 | *flagp |= flags&SPSTART; | |
392 | while (*regparse == '|') { | |
393 | regparse++; | |
394 | br = regbranch(&flags); | |
395 | if (br == NULL) | |
396 | return(NULL); | |
397 | regtail(ret, br); /* BRANCH -> BRANCH. */ | |
398 | if (!(flags&HASWIDTH)) | |
399 | *flagp &= ~HASWIDTH; | |
400 | *flagp |= flags&SPSTART; | |
401 | } | |
402 | ||
403 | /* Make a closing node, and hook it on the end. */ | |
fe14fcc3 LW |
404 | if (paren) |
405 | ender = reganode(CLOSE, parno); | |
406 | else | |
407 | ender = regnode(END); | |
a687059c LW |
408 | regtail(ret, ender); |
409 | ||
410 | /* Hook the tails of the branches to the closing node. */ | |
411 | for (br = ret; br != NULL; br = regnext(br)) | |
412 | regoptail(br, ender); | |
413 | ||
414 | /* Check for proper termination. */ | |
415 | if (paren && *regparse++ != ')') { | |
416 | FAIL("unmatched () in regexp"); | |
417 | } else if (!paren && regparse < regxend) { | |
418 | if (*regparse == ')') { | |
419 | FAIL("unmatched () in regexp"); | |
420 | } else | |
421 | FAIL("junk on end of regexp"); /* "Can't happen". */ | |
422 | /* NOTREACHED */ | |
423 | } | |
424 | ||
425 | return(ret); | |
426 | } | |
427 | ||
428 | /* | |
429 | - regbranch - one alternative of an | operator | |
430 | * | |
431 | * Implements the concatenation operator. | |
432 | */ | |
433 | static char * | |
434 | regbranch(flagp) | |
435 | int *flagp; | |
436 | { | |
437 | register char *ret; | |
438 | register char *chain; | |
439 | register char *latest; | |
440 | int flags; | |
441 | ||
442 | *flagp = WORST; /* Tentatively. */ | |
443 | ||
444 | ret = regnode(BRANCH); | |
445 | chain = NULL; | |
446 | while (regparse < regxend && *regparse != '|' && *regparse != ')') { | |
447 | latest = regpiece(&flags); | |
448 | if (latest == NULL) | |
449 | return(NULL); | |
450 | *flagp |= flags&HASWIDTH; | |
451 | if (chain == NULL) /* First piece. */ | |
452 | *flagp |= flags&SPSTART; | |
453 | else | |
454 | regtail(chain, latest); | |
455 | chain = latest; | |
456 | } | |
457 | if (chain == NULL) /* Loop ran zero times. */ | |
458 | (void) regnode(NOTHING); | |
459 | ||
460 | return(ret); | |
461 | } | |
462 | ||
463 | /* | |
464 | - regpiece - something followed by possible [*+?] | |
465 | * | |
466 | * Note that the branching code sequences used for ? and the general cases | |
467 | * of * and + are somewhat optimized: they use the same NOTHING node as | |
468 | * both the endmarker for their branch list and the body of the last branch. | |
469 | * It might seem that this node could be dispensed with entirely, but the | |
470 | * endmarker role is not redundant. | |
471 | */ | |
472 | static char * | |
473 | regpiece(flagp) | |
474 | int *flagp; | |
475 | { | |
476 | register char *ret; | |
477 | register char op; | |
478 | register char *next; | |
479 | int flags; | |
480 | char *origparse = regparse; | |
481 | int orignpar = regnpar; | |
482 | char *max; | |
483 | int iter; | |
484 | char ch; | |
485 | ||
486 | ret = regatom(&flags); | |
487 | if (ret == NULL) | |
488 | return(NULL); | |
489 | ||
490 | op = *regparse; | |
491 | ||
492 | /* Here's a total kludge: if after the atom there's a {\d+,?\d*} | |
493 | * then we decrement the first number by one and reset our | |
494 | * parsing back to the beginning of the same atom. If the first number | |
495 | * is down to 0, decrement the second number instead and fake up | |
496 | * a ? after it. Given the way this compiler doesn't keep track | |
497 | * of offsets on the first pass, this is the only way to replicate | |
498 | * a piece of code. Sigh. | |
499 | */ | |
500 | if (op == '{' && regcurly(regparse)) { | |
501 | next = regparse + 1; | |
502 | max = Nullch; | |
503 | while (isdigit(*next) || *next == ',') { | |
504 | if (*next == ',') { | |
505 | if (max) | |
506 | break; | |
507 | else | |
508 | max = next; | |
509 | } | |
510 | next++; | |
511 | } | |
512 | if (*next == '}') { /* got one */ | |
a687059c LW |
513 | if (!max) |
514 | max = next; | |
515 | regparse++; | |
516 | iter = atoi(regparse); | |
00bf170e LW |
517 | if (flags&SIMPLE) { /* we can do it right after all */ |
518 | int tmp; | |
519 | ||
520 | reginsert(CURLY, ret); | |
fe14fcc3 LW |
521 | if (iter > 0) |
522 | *flagp = (WORST|HASWIDTH); | |
00bf170e LW |
523 | if (*max == ',') |
524 | max++; | |
6eb13c3b LW |
525 | else |
526 | max = regparse; | |
00bf170e LW |
527 | tmp = atoi(max); |
528 | if (tmp && tmp < iter) | |
529 | fatal("Can't do {n,m} with n > m"); | |
530 | if (regcode != ®dummy) { | |
531 | #ifdef REGALIGN | |
532 | *(unsigned short *)(ret+3) = iter; | |
533 | *(unsigned short *)(ret+5) = tmp; | |
534 | #else | |
535 | ret[3] = iter >> 8; ret[4] = iter & 0377; | |
536 | ret[5] = tmp >> 8; ret[6] = tmp & 0377; | |
537 | #endif | |
538 | } | |
539 | regparse = next; | |
540 | goto nest_check; | |
541 | } | |
542 | regsawbracket++; /* remember we clobbered exp */ | |
a687059c LW |
543 | if (iter > 0) { |
544 | ch = *max; | |
545 | sprintf(regparse,"%.*d", max-regparse, iter - 1); | |
546 | *max = ch; | |
00bf170e LW |
547 | if (*max == ',' && max[1] != '}') { |
548 | if (atoi(max+1) <= 0) | |
549 | fatal("Can't do {n,m} with n > m"); | |
a687059c LW |
550 | ch = *next; |
551 | sprintf(max+1,"%.*d", next-(max+1), atoi(max+1) - 1); | |
552 | *next = ch; | |
553 | } | |
00bf170e | 554 | if (iter != 1 || *max == ',') { |
a687059c LW |
555 | regparse = origparse; /* back up input pointer */ |
556 | regnpar = orignpar; /* don't make more parens */ | |
557 | } | |
558 | else { | |
559 | regparse = next; | |
560 | goto nest_check; | |
561 | } | |
562 | *flagp = flags; | |
563 | return ret; | |
564 | } | |
565 | if (*max == ',') { | |
566 | max++; | |
567 | iter = atoi(max); | |
568 | if (max == next) { /* any number more? */ | |
569 | regparse = next; | |
570 | op = '*'; /* fake up one with a star */ | |
571 | } | |
572 | else if (iter > 0) { | |
573 | op = '?'; /* fake up optional atom */ | |
574 | ch = *next; | |
575 | sprintf(max,"%.*d", next-max, iter - 1); | |
576 | *next = ch; | |
577 | if (iter == 1) | |
578 | regparse = next; | |
579 | else { | |
580 | regparse = origparse - 1; /* offset ++ below */ | |
581 | regnpar = orignpar; | |
582 | } | |
583 | } | |
584 | else | |
585 | fatal("Can't do {n,0}"); | |
586 | } | |
587 | else | |
588 | fatal("Can't do {0}"); | |
589 | } | |
590 | } | |
591 | ||
592 | if (!ISMULT1(op)) { | |
593 | *flagp = flags; | |
594 | return(ret); | |
595 | } | |
596 | ||
597 | if (!(flags&HASWIDTH) && op != '?') | |
598 | FAIL("regexp *+ operand could be empty"); | |
599 | *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH); | |
600 | ||
601 | if (op == '*' && (flags&SIMPLE)) | |
602 | reginsert(STAR, ret); | |
603 | else if (op == '*') { | |
604 | /* Emit x* as (x&|), where & means "self". */ | |
605 | reginsert(BRANCH, ret); /* Either x */ | |
606 | regoptail(ret, regnode(BACK)); /* and loop */ | |
607 | regoptail(ret, ret); /* back */ | |
608 | regtail(ret, regnode(BRANCH)); /* or */ | |
609 | regtail(ret, regnode(NOTHING)); /* null. */ | |
610 | } else if (op == '+' && (flags&SIMPLE)) | |
611 | reginsert(PLUS, ret); | |
612 | else if (op == '+') { | |
613 | /* Emit x+ as x(&|), where & means "self". */ | |
614 | next = regnode(BRANCH); /* Either */ | |
615 | regtail(ret, next); | |
616 | regtail(regnode(BACK), ret); /* loop back */ | |
617 | regtail(next, regnode(BRANCH)); /* or */ | |
618 | regtail(ret, regnode(NOTHING)); /* null. */ | |
619 | } else if (op == '?') { | |
620 | /* Emit x? as (x|) */ | |
621 | reginsert(BRANCH, ret); /* Either x */ | |
622 | regtail(ret, regnode(BRANCH)); /* or */ | |
623 | next = regnode(NOTHING); /* null. */ | |
624 | regtail(ret, next); | |
625 | regoptail(ret, next); | |
626 | } | |
627 | nest_check: | |
628 | regparse++; | |
629 | if (ISMULT2(regparse)) | |
630 | FAIL("nested *?+ in regexp"); | |
631 | ||
632 | return(ret); | |
633 | } | |
634 | ||
635 | /* | |
636 | - regatom - the lowest level | |
637 | * | |
638 | * Optimization: gobbles an entire sequence of ordinary characters so that | |
639 | * it can turn them into a single node, which is smaller to store and | |
640 | * faster to run. Backslashed characters are exceptions, each becoming a | |
641 | * separate node; the code is simpler that way and it's not worth fixing. | |
642 | * | |
643 | * [Yes, it is worth fixing, some scripts can run twice the speed.] | |
644 | */ | |
645 | static char * | |
646 | regatom(flagp) | |
647 | int *flagp; | |
648 | { | |
649 | register char *ret; | |
650 | int flags; | |
651 | ||
652 | *flagp = WORST; /* Tentatively. */ | |
653 | ||
654 | switch (*regparse++) { | |
655 | case '^': | |
656 | ret = regnode(BOL); | |
657 | break; | |
658 | case '$': | |
659 | ret = regnode(EOL); | |
660 | break; | |
661 | case '.': | |
662 | ret = regnode(ANY); | |
663 | *flagp |= HASWIDTH|SIMPLE; | |
664 | break; | |
665 | case '[': | |
666 | ret = regclass(); | |
667 | *flagp |= HASWIDTH|SIMPLE; | |
668 | break; | |
669 | case '(': | |
670 | ret = reg(1, &flags); | |
671 | if (ret == NULL) | |
672 | return(NULL); | |
673 | *flagp |= flags&(HASWIDTH|SPSTART); | |
674 | break; | |
675 | case '|': | |
676 | case ')': | |
677 | FAIL("internal urp in regexp"); /* Supposed to be caught earlier. */ | |
678 | break; | |
679 | case '?': | |
680 | case '+': | |
681 | case '*': | |
682 | FAIL("?+* follows nothing in regexp"); | |
683 | break; | |
684 | case '\\': | |
685 | switch (*regparse) { | |
686 | case 'w': | |
687 | ret = regnode(ALNUM); | |
688 | *flagp |= HASWIDTH|SIMPLE; | |
689 | regparse++; | |
690 | break; | |
691 | case 'W': | |
692 | ret = regnode(NALNUM); | |
693 | *flagp |= HASWIDTH|SIMPLE; | |
694 | regparse++; | |
695 | break; | |
696 | case 'b': | |
697 | ret = regnode(BOUND); | |
698 | *flagp |= SIMPLE; | |
699 | regparse++; | |
700 | break; | |
701 | case 'B': | |
702 | ret = regnode(NBOUND); | |
703 | *flagp |= SIMPLE; | |
704 | regparse++; | |
705 | break; | |
706 | case 's': | |
707 | ret = regnode(SPACE); | |
708 | *flagp |= HASWIDTH|SIMPLE; | |
709 | regparse++; | |
710 | break; | |
711 | case 'S': | |
712 | ret = regnode(NSPACE); | |
713 | *flagp |= HASWIDTH|SIMPLE; | |
714 | regparse++; | |
715 | break; | |
716 | case 'd': | |
717 | ret = regnode(DIGIT); | |
718 | *flagp |= HASWIDTH|SIMPLE; | |
719 | regparse++; | |
720 | break; | |
721 | case 'D': | |
722 | ret = regnode(NDIGIT); | |
723 | *flagp |= HASWIDTH|SIMPLE; | |
724 | regparse++; | |
725 | break; | |
726 | case 'n': | |
727 | case 'r': | |
728 | case 't': | |
729 | case 'f': | |
fe14fcc3 LW |
730 | case 'e': |
731 | case 'a': | |
732 | case 'x': | |
733 | case 'c': | |
734 | case '0': | |
a687059c | 735 | goto defchar; |
fe14fcc3 | 736 | case '1': case '2': case '3': case '4': |
a687059c | 737 | case '5': case '6': case '7': case '8': case '9': |
fe14fcc3 LW |
738 | { |
739 | int num = atoi(regparse); | |
740 | ||
741 | if (num > 9 && num >= regnpar) | |
a687059c | 742 | goto defchar; |
fe14fcc3 LW |
743 | else { |
744 | ret = reganode(REF, num); | |
745 | while (isascii(*regparse) && isdigit(*regparse)) | |
746 | regparse++; | |
a687059c | 747 | *flagp |= SIMPLE; |
fe14fcc3 | 748 | } |
a687059c LW |
749 | } |
750 | break; | |
751 | case '\0': | |
752 | if (regparse >= regxend) | |
753 | FAIL("trailing \\ in regexp"); | |
754 | /* FALL THROUGH */ | |
755 | default: | |
756 | goto defchar; | |
757 | } | |
758 | break; | |
759 | default: { | |
760 | register int len; | |
761 | register char ender; | |
762 | register char *p; | |
763 | char *oldp; | |
fe14fcc3 | 764 | int numlen; |
a687059c LW |
765 | |
766 | defchar: | |
767 | ret = regnode(EXACTLY); | |
768 | regc(0); /* save spot for len */ | |
769 | for (len=0, p=regparse-1; | |
770 | len < 127 && p < regxend; | |
771 | len++) | |
772 | { | |
773 | oldp = p; | |
774 | switch (*p) { | |
775 | case '^': | |
776 | case '$': | |
777 | case '.': | |
778 | case '[': | |
779 | case '(': | |
780 | case ')': | |
781 | case '|': | |
782 | goto loopdone; | |
783 | case '\\': | |
784 | switch (*++p) { | |
785 | case 'w': | |
786 | case 'W': | |
787 | case 'b': | |
788 | case 'B': | |
789 | case 's': | |
790 | case 'S': | |
791 | case 'd': | |
792 | case 'D': | |
793 | --p; | |
794 | goto loopdone; | |
795 | case 'n': | |
796 | ender = '\n'; | |
797 | p++; | |
798 | break; | |
799 | case 'r': | |
800 | ender = '\r'; | |
801 | p++; | |
802 | break; | |
803 | case 't': | |
804 | ender = '\t'; | |
805 | p++; | |
806 | break; | |
807 | case 'f': | |
808 | ender = '\f'; | |
809 | p++; | |
810 | break; | |
fe14fcc3 LW |
811 | case 'e': |
812 | ender = '\033'; | |
813 | p++; | |
814 | break; | |
815 | case 'a': | |
816 | ender = '\007'; | |
817 | p++; | |
818 | break; | |
819 | case 'x': | |
820 | ender = scanhex(++p, 2, &numlen); | |
821 | p += numlen; | |
822 | break; | |
823 | case 'c': | |
824 | p++; | |
825 | ender = *p++; | |
826 | if (islower(ender)) | |
827 | ender = toupper(ender); | |
828 | ender ^= 64; | |
829 | break; | |
a687059c LW |
830 | case '0': case '1': case '2': case '3':case '4': |
831 | case '5': case '6': case '7': case '8':case '9': | |
fe14fcc3 LW |
832 | if (*p == '0' || |
833 | (isdigit(p[1]) && atoi(p) >= regnpar) ) { | |
834 | ender = scanoct(p, 3, &numlen); | |
835 | p += numlen; | |
a687059c LW |
836 | } |
837 | else { | |
838 | --p; | |
839 | goto loopdone; | |
840 | } | |
841 | break; | |
842 | case '\0': | |
843 | if (p >= regxend) | |
844 | FAIL("trailing \\ in regexp"); | |
845 | /* FALL THROUGH */ | |
846 | default: | |
847 | ender = *p++; | |
848 | break; | |
849 | } | |
850 | break; | |
851 | default: | |
852 | ender = *p++; | |
853 | break; | |
854 | } | |
855 | if (regfold && isupper(ender)) | |
856 | ender = tolower(ender); | |
857 | if (ISMULT2(p)) { /* Back off on ?+*. */ | |
858 | if (len) | |
859 | p = oldp; | |
860 | else { | |
861 | len++; | |
862 | regc(ender); | |
863 | } | |
864 | break; | |
865 | } | |
866 | regc(ender); | |
867 | } | |
868 | loopdone: | |
869 | regparse = p; | |
870 | if (len <= 0) | |
871 | FAIL("internal disaster in regexp"); | |
872 | *flagp |= HASWIDTH; | |
873 | if (len == 1) | |
874 | *flagp |= SIMPLE; | |
875 | if (regcode != ®dummy) | |
876 | *OPERAND(ret) = len; | |
877 | regc('\0'); | |
878 | } | |
879 | break; | |
880 | } | |
881 | ||
882 | return(ret); | |
883 | } | |
884 | ||
885 | static void | |
886 | regset(bits,def,c) | |
887 | char *bits; | |
888 | int def; | |
889 | register int c; | |
890 | { | |
891 | if (regcode == ®dummy) | |
892 | return; | |
ac58e20f | 893 | c &= 255; |
a687059c LW |
894 | if (def) |
895 | bits[c >> 3] &= ~(1 << (c & 7)); | |
896 | else | |
897 | bits[c >> 3] |= (1 << (c & 7)); | |
898 | } | |
899 | ||
900 | static char * | |
901 | regclass() | |
902 | { | |
903 | register char *bits; | |
904 | register int class; | |
905 | register int lastclass; | |
906 | register int range = 0; | |
907 | register char *ret; | |
908 | register int def; | |
fe14fcc3 | 909 | int numlen; |
a687059c | 910 | |
00bf170e | 911 | ret = regnode(ANYOF); |
a687059c | 912 | if (*regparse == '^') { /* Complement of range. */ |
a687059c LW |
913 | regparse++; |
914 | def = 0; | |
915 | } else { | |
a687059c LW |
916 | def = 255; |
917 | } | |
918 | bits = regcode; | |
919 | for (class = 0; class < 32; class++) | |
920 | regc(def); | |
921 | if (*regparse == ']' || *regparse == '-') | |
00bf170e | 922 | goto skipcond; /* allow 1st char to be ] or - */ |
a687059c | 923 | while (regparse < regxend && *regparse != ']') { |
00bf170e | 924 | skipcond: |
a687059c LW |
925 | class = UCHARAT(regparse++); |
926 | if (class == '\\') { | |
927 | class = UCHARAT(regparse++); | |
928 | switch (class) { | |
929 | case 'w': | |
930 | for (class = 'a'; class <= 'z'; class++) | |
931 | regset(bits,def,class); | |
932 | for (class = 'A'; class <= 'Z'; class++) | |
933 | regset(bits,def,class); | |
934 | for (class = '0'; class <= '9'; class++) | |
935 | regset(bits,def,class); | |
936 | regset(bits,def,'_'); | |
937 | lastclass = 1234; | |
938 | continue; | |
939 | case 's': | |
940 | regset(bits,def,' '); | |
941 | regset(bits,def,'\t'); | |
942 | regset(bits,def,'\r'); | |
943 | regset(bits,def,'\f'); | |
944 | regset(bits,def,'\n'); | |
945 | lastclass = 1234; | |
946 | continue; | |
947 | case 'd': | |
948 | for (class = '0'; class <= '9'; class++) | |
949 | regset(bits,def,class); | |
950 | lastclass = 1234; | |
951 | continue; | |
952 | case 'n': | |
953 | class = '\n'; | |
954 | break; | |
955 | case 'r': | |
956 | class = '\r'; | |
957 | break; | |
958 | case 't': | |
959 | class = '\t'; | |
960 | break; | |
961 | case 'f': | |
962 | class = '\f'; | |
963 | break; | |
964 | case 'b': | |
965 | class = '\b'; | |
966 | break; | |
fe14fcc3 LW |
967 | case 'e': |
968 | class = '\033'; | |
969 | break; | |
970 | case 'a': | |
971 | class = '\007'; | |
972 | break; | |
973 | case 'x': | |
974 | class = scanhex(regparse, 2, &numlen); | |
975 | regparse += numlen; | |
976 | break; | |
977 | case 'c': | |
978 | class = *regparse++; | |
979 | if (islower(class)) | |
980 | class = toupper(class); | |
981 | class ^= 64; | |
982 | break; | |
a687059c LW |
983 | case '0': case '1': case '2': case '3': case '4': |
984 | case '5': case '6': case '7': case '8': case '9': | |
fe14fcc3 LW |
985 | class = scanoct(--regparse, 3, &numlen); |
986 | regparse += numlen; | |
a687059c LW |
987 | break; |
988 | } | |
989 | } | |
a687059c LW |
990 | if (range) { |
991 | if (lastclass > class) | |
992 | FAIL("invalid [] range in regexp"); | |
00bf170e | 993 | range = 0; |
a687059c | 994 | } |
00bf170e LW |
995 | else { |
996 | lastclass = class; | |
997 | if (*regparse == '-' && regparse+1 < regxend && | |
998 | regparse[1] != ']') { | |
999 | regparse++; | |
1000 | range = 1; | |
1001 | continue; /* do it next time */ | |
1002 | } | |
1003 | } | |
1004 | for ( ; lastclass <= class; lastclass++) { | |
a687059c LW |
1005 | regset(bits,def,lastclass); |
1006 | if (regfold && isupper(lastclass)) | |
1007 | regset(bits,def,tolower(lastclass)); | |
1008 | } | |
1009 | lastclass = class; | |
1010 | } | |
1011 | if (*regparse != ']') | |
1012 | FAIL("unmatched [] in regexp"); | |
a687059c LW |
1013 | regparse++; |
1014 | return ret; | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | - regnode - emit a node | |
1019 | */ | |
1020 | static char * /* Location. */ | |
1021 | regnode(op) | |
1022 | char op; | |
1023 | { | |
1024 | register char *ret; | |
1025 | register char *ptr; | |
1026 | ||
1027 | ret = regcode; | |
1028 | if (ret == ®dummy) { | |
1029 | #ifdef REGALIGN | |
1030 | if (!(regsize & 1)) | |
1031 | regsize++; | |
1032 | #endif | |
1033 | regsize += 3; | |
1034 | return(ret); | |
1035 | } | |
1036 | ||
1037 | #ifdef REGALIGN | |
1038 | #ifndef lint | |
1039 | if (!((long)ret & 1)) | |
1040 | *ret++ = 127; | |
1041 | #endif | |
1042 | #endif | |
1043 | ptr = ret; | |
1044 | *ptr++ = op; | |
1045 | *ptr++ = '\0'; /* Null "next" pointer. */ | |
1046 | *ptr++ = '\0'; | |
1047 | regcode = ptr; | |
1048 | ||
1049 | return(ret); | |
1050 | } | |
1051 | ||
1052 | /* | |
fe14fcc3 LW |
1053 | - reganode - emit a node with an argument |
1054 | */ | |
1055 | static char * /* Location. */ | |
1056 | reganode(op, arg) | |
1057 | char op; | |
1058 | unsigned short arg; | |
1059 | { | |
1060 | register char *ret; | |
1061 | register char *ptr; | |
1062 | ||
1063 | ret = regcode; | |
1064 | if (ret == ®dummy) { | |
1065 | #ifdef REGALIGN | |
1066 | if (!(regsize & 1)) | |
1067 | regsize++; | |
1068 | #endif | |
1069 | regsize += 5; | |
1070 | return(ret); | |
1071 | } | |
1072 | ||
1073 | #ifdef REGALIGN | |
1074 | #ifndef lint | |
1075 | if (!((long)ret & 1)) | |
1076 | *ret++ = 127; | |
1077 | #endif | |
1078 | #endif | |
1079 | ptr = ret; | |
1080 | *ptr++ = op; | |
1081 | *ptr++ = '\0'; /* Null "next" pointer. */ | |
1082 | *ptr++ = '\0'; | |
1083 | #ifdef REGALIGN | |
1084 | *(unsigned short *)(ret+3) = arg; | |
1085 | #else | |
1086 | ret[3] = arg >> 8; ret[4] = arg & 0377; | |
1087 | #endif | |
1088 | ptr += 2; | |
1089 | regcode = ptr; | |
1090 | ||
1091 | return(ret); | |
1092 | } | |
1093 | ||
1094 | /* | |
a687059c LW |
1095 | - regc - emit (if appropriate) a byte of code |
1096 | */ | |
1097 | static void | |
1098 | regc(b) | |
1099 | char b; | |
1100 | { | |
1101 | if (regcode != ®dummy) | |
1102 | *regcode++ = b; | |
1103 | else | |
1104 | regsize++; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | - reginsert - insert an operator in front of already-emitted operand | |
1109 | * | |
1110 | * Means relocating the operand. | |
1111 | */ | |
1112 | static void | |
1113 | reginsert(op, opnd) | |
1114 | char op; | |
1115 | char *opnd; | |
1116 | { | |
1117 | register char *src; | |
1118 | register char *dst; | |
1119 | register char *place; | |
00bf170e | 1120 | register offset = (op == CURLY ? 4 : 0); |
a687059c LW |
1121 | |
1122 | if (regcode == ®dummy) { | |
1123 | #ifdef REGALIGN | |
00bf170e | 1124 | regsize += 4 + offset; |
a687059c | 1125 | #else |
00bf170e | 1126 | regsize += 3 + offset; |
a687059c LW |
1127 | #endif |
1128 | return; | |
1129 | } | |
1130 | ||
1131 | src = regcode; | |
1132 | #ifdef REGALIGN | |
00bf170e | 1133 | regcode += 4 + offset; |
a687059c | 1134 | #else |
00bf170e | 1135 | regcode += 3 + offset; |
a687059c LW |
1136 | #endif |
1137 | dst = regcode; | |
1138 | while (src > opnd) | |
1139 | *--dst = *--src; | |
1140 | ||
1141 | place = opnd; /* Op node, where operand used to be. */ | |
1142 | *place++ = op; | |
1143 | *place++ = '\0'; | |
1144 | *place++ = '\0'; | |
00bf170e LW |
1145 | while (offset-- > 0) |
1146 | *place++ = '\0'; | |
a687059c LW |
1147 | } |
1148 | ||
1149 | /* | |
1150 | - regtail - set the next-pointer at the end of a node chain | |
1151 | */ | |
1152 | static void | |
1153 | regtail(p, val) | |
1154 | char *p; | |
1155 | char *val; | |
1156 | { | |
1157 | register char *scan; | |
1158 | register char *temp; | |
1159 | register int offset; | |
1160 | ||
1161 | if (p == ®dummy) | |
1162 | return; | |
1163 | ||
1164 | /* Find last node. */ | |
1165 | scan = p; | |
1166 | for (;;) { | |
1167 | temp = regnext(scan); | |
1168 | if (temp == NULL) | |
1169 | break; | |
1170 | scan = temp; | |
1171 | } | |
1172 | ||
1173 | #ifdef REGALIGN | |
1174 | offset = val - scan; | |
1175 | #ifndef lint | |
1176 | *(short*)(scan+1) = offset; | |
1177 | #else | |
1178 | offset = offset; | |
1179 | #endif | |
1180 | #else | |
1181 | if (OP(scan) == BACK) | |
1182 | offset = scan - val; | |
1183 | else | |
1184 | offset = val - scan; | |
1185 | *(scan+1) = (offset>>8)&0377; | |
1186 | *(scan+2) = offset&0377; | |
1187 | #endif | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | - regoptail - regtail on operand of first argument; nop if operandless | |
1192 | */ | |
1193 | static void | |
1194 | regoptail(p, val) | |
1195 | char *p; | |
1196 | char *val; | |
1197 | { | |
1198 | /* "Operandless" and "op != BRANCH" are synonymous in practice. */ | |
1199 | if (p == NULL || p == ®dummy || OP(p) != BRANCH) | |
1200 | return; | |
1201 | regtail(NEXTOPER(p), val); | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | - regcurly - a little FSA that accepts {\d+,?\d*} | |
1206 | */ | |
1207 | STATIC int | |
1208 | regcurly(s) | |
1209 | register char *s; | |
1210 | { | |
1211 | if (*s++ != '{') | |
1212 | return FALSE; | |
1213 | if (!isdigit(*s)) | |
1214 | return FALSE; | |
1215 | while (isdigit(*s)) | |
1216 | s++; | |
1217 | if (*s == ',') | |
1218 | s++; | |
1219 | while (isdigit(*s)) | |
1220 | s++; | |
1221 | if (*s != '}') | |
1222 | return FALSE; | |
1223 | return TRUE; | |
1224 | } | |
1225 | ||
1226 | #ifdef DEBUGGING | |
1227 | ||
1228 | /* | |
1229 | - regdump - dump a regexp onto stderr in vaguely comprehensible form | |
1230 | */ | |
1231 | void | |
1232 | regdump(r) | |
1233 | regexp *r; | |
1234 | { | |
1235 | register char *s; | |
1236 | register char op = EXACTLY; /* Arbitrary non-END op. */ | |
1237 | register char *next; | |
a687059c LW |
1238 | |
1239 | ||
1240 | s = r->program + 1; | |
1241 | while (op != END) { /* While that wasn't END last time... */ | |
1242 | #ifdef REGALIGN | |
1243 | if (!((long)s & 1)) | |
1244 | s++; | |
1245 | #endif | |
1246 | op = OP(s); | |
1247 | fprintf(stderr,"%2d%s", s-r->program, regprop(s)); /* Where, what. */ | |
1248 | next = regnext(s); | |
fe14fcc3 | 1249 | s += regarglen[op]; |
a687059c LW |
1250 | if (next == NULL) /* Next ptr. */ |
1251 | fprintf(stderr,"(0)"); | |
1252 | else | |
1253 | fprintf(stderr,"(%d)", (s-r->program)+(next-s)); | |
1254 | s += 3; | |
00bf170e | 1255 | if (op == ANYOF) { |
a687059c LW |
1256 | s += 32; |
1257 | } | |
1258 | if (op == EXACTLY) { | |
1259 | /* Literal string, where present. */ | |
1260 | s++; | |
1261 | while (*s != '\0') { | |
1262 | (void)putchar(*s); | |
1263 | s++; | |
1264 | } | |
1265 | s++; | |
1266 | } | |
1267 | (void)putchar('\n'); | |
1268 | } | |
1269 | ||
1270 | /* Header fields of interest. */ | |
1271 | if (r->regstart) | |
1272 | fprintf(stderr,"start `%s' ", r->regstart->str_ptr); | |
1273 | if (r->regstclass) | |
1274 | fprintf(stderr,"stclass `%s' ", regprop(r->regstclass)); | |
00bf170e | 1275 | if (r->reganch & 1) |
a687059c | 1276 | fprintf(stderr,"anchored "); |
00bf170e LW |
1277 | if (r->reganch & 2) |
1278 | fprintf(stderr,"plus "); | |
a687059c LW |
1279 | if (r->regmust != NULL) |
1280 | fprintf(stderr,"must have \"%s\" back %d ", r->regmust->str_ptr, | |
1281 | r->regback); | |
1282 | fprintf(stderr,"\n"); | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | - regprop - printable representation of opcode | |
1287 | */ | |
1288 | char * | |
1289 | regprop(op) | |
1290 | char *op; | |
1291 | { | |
1292 | register char *p; | |
1293 | ||
1294 | (void) strcpy(buf, ":"); | |
1295 | ||
1296 | switch (OP(op)) { | |
1297 | case BOL: | |
1298 | p = "BOL"; | |
1299 | break; | |
1300 | case EOL: | |
1301 | p = "EOL"; | |
1302 | break; | |
1303 | case ANY: | |
1304 | p = "ANY"; | |
1305 | break; | |
1306 | case ANYOF: | |
1307 | p = "ANYOF"; | |
1308 | break; | |
a687059c LW |
1309 | case BRANCH: |
1310 | p = "BRANCH"; | |
1311 | break; | |
1312 | case EXACTLY: | |
1313 | p = "EXACTLY"; | |
1314 | break; | |
1315 | case NOTHING: | |
1316 | p = "NOTHING"; | |
1317 | break; | |
1318 | case BACK: | |
1319 | p = "BACK"; | |
1320 | break; | |
1321 | case END: | |
1322 | p = "END"; | |
1323 | break; | |
1324 | case ALNUM: | |
1325 | p = "ALNUM"; | |
1326 | break; | |
1327 | case NALNUM: | |
1328 | p = "NALNUM"; | |
1329 | break; | |
1330 | case BOUND: | |
1331 | p = "BOUND"; | |
1332 | break; | |
1333 | case NBOUND: | |
1334 | p = "NBOUND"; | |
1335 | break; | |
1336 | case SPACE: | |
1337 | p = "SPACE"; | |
1338 | break; | |
1339 | case NSPACE: | |
1340 | p = "NSPACE"; | |
1341 | break; | |
1342 | case DIGIT: | |
1343 | p = "DIGIT"; | |
1344 | break; | |
1345 | case NDIGIT: | |
1346 | p = "NDIGIT"; | |
1347 | break; | |
00bf170e LW |
1348 | case CURLY: |
1349 | (void)sprintf(buf+strlen(buf), "CURLY {%d,%d}", | |
1350 | ARG1(op),ARG2(op)); | |
1351 | p = NULL; | |
1352 | break; | |
a687059c | 1353 | case REF: |
fe14fcc3 | 1354 | (void)sprintf(buf+strlen(buf), "REF%d", ARG1(op)); |
a687059c LW |
1355 | p = NULL; |
1356 | break; | |
fe14fcc3 LW |
1357 | case OPEN: |
1358 | (void)sprintf(buf+strlen(buf), "OPEN%d", ARG1(op)); | |
a687059c LW |
1359 | p = NULL; |
1360 | break; | |
fe14fcc3 LW |
1361 | case CLOSE: |
1362 | (void)sprintf(buf+strlen(buf), "CLOSE%d", ARG1(op)); | |
a687059c LW |
1363 | p = NULL; |
1364 | break; | |
1365 | case STAR: | |
1366 | p = "STAR"; | |
1367 | break; | |
1368 | case PLUS: | |
1369 | p = "PLUS"; | |
1370 | break; | |
1371 | default: | |
1372 | FAIL("corrupted regexp opcode"); | |
1373 | } | |
1374 | if (p != NULL) | |
1375 | (void) strcat(buf, p); | |
1376 | return(buf); | |
1377 | } | |
1378 | #endif /* DEBUGGING */ | |
1379 | ||
1380 | regfree(r) | |
1381 | struct regexp *r; | |
1382 | { | |
fe14fcc3 | 1383 | if (r->precomp) { |
a687059c | 1384 | Safefree(r->precomp); |
fe14fcc3 LW |
1385 | r->precomp = Nullch; |
1386 | } | |
1387 | if (r->subbase) { | |
a687059c | 1388 | Safefree(r->subbase); |
fe14fcc3 LW |
1389 | r->subbase = Nullch; |
1390 | } | |
1391 | if (r->regmust) { | |
a687059c | 1392 | str_free(r->regmust); |
fe14fcc3 LW |
1393 | r->regmust = Nullstr; |
1394 | } | |
1395 | if (r->regstart) { | |
a687059c | 1396 | str_free(r->regstart); |
fe14fcc3 LW |
1397 | r->regstart = Nullstr; |
1398 | } | |
1399 | Safefree(r->startp); | |
1400 | Safefree(r->endp); | |
a687059c LW |
1401 | Safefree(r); |
1402 | } |