Bug Summary

File:src/lib/libc/regex/engine.c
Warning:line 369, column 5
Value stored to 'dp' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name regexec.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -fhalf-no-semantic-interposition -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libc/obj -resource-dir /usr/local/lib/clang/13.0.0 -include namespace.h -I /usr/src/lib/libc/include -I /usr/src/lib/libc/hidden -D __LIBC__ -D APIWARN -D YP -I /usr/src/lib/libc/yp -I /usr/src/lib/libc -I /usr/src/lib/libc/gdtoa -I /usr/src/lib/libc/arch/amd64/gdtoa -D INFNAN_CHECK -D MULTIPLE_THREADS -D NO_FENV_H -D USE_LOCALE -I /usr/src/lib/libc -I /usr/src/lib/libc/citrus -D RESOLVSORT -D FLOATING_POINT -D PRINTF_WIDE_CHAR -D SCANF_WIDE_CHAR -D FUTEX -D PIC -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libc/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libc/regex/regexec.c
1/* $OpenBSD: engine.c,v 1.26 2020/12/28 21:41:55 millert Exp $ */
2
3/*-
4 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
5 * Copyright (c) 1992, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Henry Spencer.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)engine.c 8.5 (Berkeley) 3/20/94
36 */
37
38/*
39 * The matching engine and friends. This file is #included by regexec.c
40 * after suitable #defines of a variety of macros used herein, so that
41 * different state representations can be used without duplicating masses
42 * of code.
43 */
44
45#ifdef SNAMES
46#define matcher smatcher
47#define fast sfast
48#define slow sslow
49#define dissect sdissect
50#define backref sbackref
51#define step sstep
52#define print sprint
53#define at sat
54#define match smat
55#define nope snope
56#endif
57#ifdef LNAMES
58#define matcher lmatcher
59#define fast lfast
60#define slow lslow
61#define dissect ldissect
62#define backref lbackref
63#define step lstep
64#define print lprint
65#define at lat
66#define match lmat
67#define nope lnope
68#endif
69
70/* another structure passed up and down to avoid zillions of parameters */
71struct match {
72 struct re_guts *g;
73 int eflags;
74 regmatch_t *pmatch; /* [nsub+1] (0 element unused) */
75 const char *offp; /* offsets work from here */
76 const char *beginp; /* start of string -- virtual NUL precedes */
77 const char *endp; /* end of string -- virtual NUL here */
78 const char *coldp; /* can be no match starting before here */
79 const char **lastpos; /* [nplus+1] */
80 STATEVARSlong vn; char *space;
81 stateschar * st; /* current states */
82 stateschar * fresh; /* states for a fresh start */
83 stateschar * tmp; /* temporary */
84 stateschar * empty; /* empty set of states */
85};
86
87static int matcher(struct re_guts *, const char *, size_t, regmatch_t[], int);
88static const char *dissect(struct match *, const char *, const char *, sopno,
89 sopno);
90static const char *backref(struct match *, const char *, const char *, sopno,
91 sopno, sopno, int);
92static const char *fast(struct match *, const char *, const char *, sopno,
93 sopno);
94static const char *slow(struct match *, const char *, const char *, sopno,
95 sopno);
96static stateschar * step(struct re_guts *, sopno, sopno, stateschar *, int, stateschar *);
97#define MAX_RECURSION100 100
98#define BOL((127 +1)+1) (OUT(127 +1)+1)
99#define EOL(((127 +1)+1)+1) (BOL((127 +1)+1)+1)
100#define BOLEOL(((127 +1)+1)+2) (BOL((127 +1)+1)+2)
101#define NOTHING(((127 +1)+1)+3) (BOL((127 +1)+1)+3)
102#define BOW(((127 +1)+1)+4) (BOL((127 +1)+1)+4)
103#define EOW(((127 +1)+1)+5) (BOL((127 +1)+1)+5)
104/* update nonchars[] array below when adding fake chars here */
105#define CODEMAX(((127 +1)+1)+5) (BOL((127 +1)+1)+5) /* highest code used */
106#define NONCHAR(c)((c) > 127) ((c) > CHAR_MAX127)
107#define NNONCHAR((((127 +1)+1)+5)-127) (CODEMAX(((127 +1)+1)+5)-CHAR_MAX127)
108#ifdef REDEBUG
109static void print(struct match *, const char *, stateschar *, int, FILE *);
110#endif
111#ifdef REDEBUG
112static void at(struct match *, const char *, const char *, const char *,
113 sopno, sopno);
114#endif
115#ifdef REDEBUG
116static const char *pchar(int);
117#endif
118
119#ifdef REDEBUG
120#define SP(t, s, c) print(m, t, s, c, stdout(&__sF[1]))
121#define AT(t, p1, p2, s1, s2) at(m, t, p1, p2, s1, s2)
122#define NOTE(str) { if (m->eflags&REG_TRACE00400) (void)printf("=%s\n", (str)); }
123static int nope = 0;
124#else
125#define SP(t, s, c) /* nothing */
126#define AT(t, p1, p2, s1, s2) /* nothing */
127#define NOTE(s) /* nothing */
128#endif
129
130/*
131 - matcher - the actual matching engine
132 */
133static int /* 0 success, REG_NOMATCH failure */
134matcher(struct re_guts *g, const char *string, size_t nmatch,
135 regmatch_t pmatch[], int eflags)
136{
137 const char *endp;
138 int i;
139 struct match mv;
140 struct match *m = &mv;
141 const char *dp;
142 const sopno gf = g->firststate+1; /* +1 for OEND */
143 const sopno gl = g->laststate;
144 const char *start;
145 const char *stop;
146
147 /* simplify the situation where possible */
148 if (g->cflags&REG_NOSUB0004)
149 nmatch = 0;
150 if (eflags&REG_STARTEND00004) {
151 start = string + pmatch[0].rm_so;
152 stop = string + pmatch[0].rm_eo;
153 } else {
154 start = string;
155 stop = start + strlen(start);
156 }
157 if (stop < start)
158 return(REG_INVARG16);
159
160 /* prescreening; this does wonders for this rather slow code */
161 if (g->must != NULL((void *)0)) {
162 for (dp = start; dp < stop; dp++)
163 if (*dp == g->must[0] && stop - dp >= g->mlen &&
164 memcmp(dp, g->must, g->mlen) == 0)
165 break;
166 if (dp == stop) /* we didn't find g->must */
167 return(REG_NOMATCH1);
168 }
169
170 /* match struct setup */
171 m->g = g;
172 m->eflags = eflags;
173 m->pmatch = NULL((void *)0);
174 m->lastpos = NULL((void *)0);
175 m->offp = string;
176 m->beginp = start;
177 m->endp = stop;
178 STATESETUP(m, 4){ (m)->space = reallocarray(((void *)0), (m)->g->nstates
, (4)); if ((m)->space == ((void *)0)) return(12); (m)->
vn = 0; };
179 SETUP(m->st)((m->st) = &m->space[m->vn++ * m->g->nstates
]);
180 SETUP(m->fresh)((m->fresh) = &m->space[m->vn++ * m->g->nstates
]);
181 SETUP(m->tmp)((m->tmp) = &m->space[m->vn++ * m->g->nstates
]);
182 SETUP(m->empty)((m->empty) = &m->space[m->vn++ * m->g->nstates
]);
183 CLEAR(m->empty)memset(m->empty, 0, m->g->nstates);
184
185 /* this loop does only one repetition except for backrefs */
186 for (;;) {
187 endp = fast(m, start, stop, gf, gl);
188 if (endp == NULL((void *)0)) { /* a miss */
189 free(m->pmatch);
190 free(m->lastpos);
191 STATETEARDOWN(m){ free((m)->space); };
192 return(REG_NOMATCH1);
193 }
194 if (nmatch == 0 && !g->backrefs)
195 break; /* no further info needed */
196
197 /* where? */
198 assert(m->coldp != NULL)((void)0);
199 for (;;) {
200 NOTE("finding start");
201 endp = slow(m, m->coldp, stop, gf, gl);
202 if (endp != NULL((void *)0))
203 break;
204 assert(m->coldp < m->endp)((void)0);
205 m->coldp++;
206 }
207 if (nmatch == 1 && !g->backrefs)
208 break; /* no further info needed */
209
210 /* oh my, he wants the subexpressions... */
211 if (m->pmatch == NULL((void *)0))
212 m->pmatch = reallocarray(NULL((void *)0), m->g->nsub + 1,
213 sizeof(regmatch_t));
214 if (m->pmatch == NULL((void *)0)) {
215 STATETEARDOWN(m){ free((m)->space); };
216 return(REG_ESPACE12);
217 }
218 for (i = 1; i <= m->g->nsub; i++)
219 m->pmatch[i].rm_so = m->pmatch[i].rm_eo = -1;
220 if (!g->backrefs && !(m->eflags&REG_BACKR02000)) {
221 NOTE("dissecting");
222 dp = dissect(m, m->coldp, endp, gf, gl);
223 } else {
224 if (g->nplus > 0 && m->lastpos == NULL((void *)0))
225 m->lastpos = reallocarray(NULL((void *)0),
226 g->nplus+1, sizeof(char *));
227 if (g->nplus > 0 && m->lastpos == NULL((void *)0)) {
228 free(m->pmatch);
229 STATETEARDOWN(m){ free((m)->space); };
230 return(REG_ESPACE12);
231 }
232 NOTE("backref dissect");
233 dp = backref(m, m->coldp, endp, gf, gl, (sopno)0, 0);
234 }
235 if (dp != NULL((void *)0))
236 break;
237
238 /* uh-oh... we couldn't find a subexpression-level match */
239 assert(g->backrefs)((void)0); /* must be back references doing it */
240 assert(g->nplus == 0 || m->lastpos != NULL)((void)0);
241 for (;;) {
242 if (dp != NULL((void *)0) || endp <= m->coldp)
243 break; /* defeat */
244 NOTE("backoff");
245 endp = slow(m, m->coldp, endp-1, gf, gl);
246 if (endp == NULL((void *)0))
247 break; /* defeat */
248 /* try it on a shorter possibility */
249#ifndef NDEBUG
250 for (i = 1; i <= m->g->nsub; i++) {
251 assert(m->pmatch[i].rm_so == -1)((void)0);
252 assert(m->pmatch[i].rm_eo == -1)((void)0);
253 }
254#endif
255 NOTE("backoff dissect");
256 dp = backref(m, m->coldp, endp, gf, gl, (sopno)0, 0);
257 }
258 assert(dp == NULL || dp == endp)((void)0);
259 if (dp != NULL((void *)0)) /* found a shorter one */
260 break;
261
262 /* despite initial appearances, there is no match here */
263 NOTE("false alarm");
264 if (m->coldp == stop)
265 break;
266 start = m->coldp + 1; /* recycle starting later */
267 }
268
269 /* fill in the details if requested */
270 if (nmatch > 0) {
271 pmatch[0].rm_so = m->coldp - m->offp;
272 pmatch[0].rm_eo = endp - m->offp;
273 }
274 if (nmatch > 1) {
275 assert(m->pmatch != NULL)((void)0);
276 for (i = 1; i < nmatch; i++)
277 if (i <= m->g->nsub)
278 pmatch[i] = m->pmatch[i];
279 else {
280 pmatch[i].rm_so = -1;
281 pmatch[i].rm_eo = -1;
282 }
283 }
284
285 free(m->pmatch);
286 free(m->lastpos);
287 STATETEARDOWN(m){ free((m)->space); };
288 return(0);
289}
290
291/*
292 - dissect - figure out what matched what, no back references
293 */
294static const char * /* == stop (success) always */
295dissect(struct match *m, const char *start, const char *stop, sopno startst,
296 sopno stopst)
297{
298 int i;
299 sopno ss; /* start sop of current subRE */
300 sopno es; /* end sop of current subRE */
301 const char *sp; /* start of string matched by it */
302 const char *stp; /* string matched by it cannot pass here */
303 const char *rest; /* start of rest of string */
304 const char *tail; /* string unmatched by rest of RE */
305 sopno ssub; /* start sop of subsubRE */
306 sopno esub; /* end sop of subsubRE */
307 const char *ssp; /* start of string matched by subsubRE */
308 const char *sep; /* end of string matched by subsubRE */
309 const char *oldssp; /* previous ssp */
310 const char *dp;
311
312 AT("diss", start, stop, startst, stopst);
313 sp = start;
314 for (ss = startst; ss < stopst; ss = es) {
315 /* identify end of subRE */
316 es = ss;
317 switch (OP(m->g->strip[es])((m->g->strip[es])&0xf8000000LU)) {
318 case OPLUS_(9LU<<((unsigned)27)):
319 case OQUEST_(11LU<<((unsigned)27)):
320 es += OPND(m->g->strip[es])((m->g->strip[es])&0x07ffffffLU);
321 break;
322 case OCH_(15LU<<((unsigned)27)):
323 while (OP(m->g->strip[es])((m->g->strip[es])&0xf8000000LU) != O_CH(18LU<<((unsigned)27)))
324 es += OPND(m->g->strip[es])((m->g->strip[es])&0x07ffffffLU);
325 break;
326 }
327 es++;
328
329 /* figure out what it matched */
330 switch (OP(m->g->strip[ss])((m->g->strip[ss])&0xf8000000LU)) {
331 case OEND(1LU<<((unsigned)27)):
332 assert(nope)((void)0);
333 break;
334 case OCHAR(2LU<<((unsigned)27)):
335 sp++;
336 break;
337 case OBOL(3LU<<((unsigned)27)):
338 case OEOL(4LU<<((unsigned)27)):
339 case OBOW(19LU<<((unsigned)27)):
340 case OEOW(20LU<<((unsigned)27)):
341 break;
342 case OANY(5LU<<((unsigned)27)):
343 case OANYOF(6LU<<((unsigned)27)):
344 sp++;
345 break;
346 case OBACK_(7LU<<((unsigned)27)):
347 case O_BACK(8LU<<((unsigned)27)):
348 assert(nope)((void)0);
349 break;
350 /* cases where length of match is hard to find */
351 case OQUEST_(11LU<<((unsigned)27)):
352 stp = stop;
353 for (;;) {
354 /* how long could this one be? */
355 rest = slow(m, sp, stp, ss, es);
356 assert(rest != NULL)((void)0); /* it did match */
357 /* could the rest match the rest? */
358 tail = slow(m, rest, stop, es, stopst);
359 if (tail == stop)
360 break; /* yes! */
361 /* no -- try a shorter match for this one */
362 stp = rest - 1;
363 assert(stp >= sp)((void)0); /* it did work */
364 }
365 ssub = ss + 1;
366 esub = es - 1;
367 /* did innards match? */
368 if (slow(m, sp, rest, ssub, esub) != NULL((void *)0)) {
369 dp = dissect(m, sp, rest, ssub, esub);
Value stored to 'dp' is never read
370 assert(dp == rest)((void)0);
371 } else /* no */
372 assert(sp == rest)((void)0);
373 sp = rest;
374 break;
375 case OPLUS_(9LU<<((unsigned)27)):
376 stp = stop;
377 for (;;) {
378 /* how long could this one be? */
379 rest = slow(m, sp, stp, ss, es);
380 assert(rest != NULL)((void)0); /* it did match */
381 /* could the rest match the rest? */
382 tail = slow(m, rest, stop, es, stopst);
383 if (tail == stop)
384 break; /* yes! */
385 /* no -- try a shorter match for this one */
386 stp = rest - 1;
387 assert(stp >= sp)((void)0); /* it did work */
388 }
389 ssub = ss + 1;
390 esub = es - 1;
391 ssp = sp;
392 oldssp = ssp;
393 for (;;) { /* find last match of innards */
394 sep = slow(m, ssp, rest, ssub, esub);
395 if (sep == NULL((void *)0) || sep == ssp)
396 break; /* failed or matched null */
397 oldssp = ssp; /* on to next try */
398 ssp = sep;
399 }
400 if (sep == NULL((void *)0)) {
401 /* last successful match */
402 sep = ssp;
403 ssp = oldssp;
404 }
405 assert(sep == rest)((void)0); /* must exhaust substring */
406 assert(slow(m, ssp, sep, ssub, esub) == rest)((void)0);
407 dp = dissect(m, ssp, sep, ssub, esub);
408 assert(dp == sep)((void)0);
409 sp = rest;
410 break;
411 case OCH_(15LU<<((unsigned)27)):
412 stp = stop;
413 for (;;) {
414 /* how long could this one be? */
415 rest = slow(m, sp, stp, ss, es);
416 assert(rest != NULL)((void)0); /* it did match */
417 /* could the rest match the rest? */
418 tail = slow(m, rest, stop, es, stopst);
419 if (tail == stop)
420 break; /* yes! */
421 /* no -- try a shorter match for this one */
422 stp = rest - 1;
423 assert(stp >= sp)((void)0); /* it did work */
424 }
425 ssub = ss + 1;
426 esub = ss + OPND(m->g->strip[ss])((m->g->strip[ss])&0x07ffffffLU) - 1;
427 assert(OP(m->g->strip[esub]) == OOR1)((void)0);
428 for (;;) { /* find first matching branch */
429 if (slow(m, sp, rest, ssub, esub) == rest)
430 break; /* it matched all of it */
431 /* that one missed, try next one */
432 assert(OP(m->g->strip[esub]) == OOR1)((void)0);
433 esub++;
434 assert(OP(m->g->strip[esub]) == OOR2)((void)0);
435 ssub = esub + 1;
436 esub += OPND(m->g->strip[esub])((m->g->strip[esub])&0x07ffffffLU);
437 if (OP(m->g->strip[esub])((m->g->strip[esub])&0xf8000000LU) == OOR2(17LU<<((unsigned)27)))
438 esub--;
439 else
440 assert(OP(m->g->strip[esub]) == O_CH)((void)0);
441 }
442 dp = dissect(m, sp, rest, ssub, esub);
443 assert(dp == rest)((void)0);
444 sp = rest;
445 break;
446 case O_PLUS(10LU<<((unsigned)27)):
447 case O_QUEST(12LU<<((unsigned)27)):
448 case OOR1(16LU<<((unsigned)27)):
449 case OOR2(17LU<<((unsigned)27)):
450 case O_CH(18LU<<((unsigned)27)):
451 assert(nope)((void)0);
452 break;
453 case OLPAREN(13LU<<((unsigned)27)):
454 i = OPND(m->g->strip[ss])((m->g->strip[ss])&0x07ffffffLU);
455 assert(0 < i && i <= m->g->nsub)((void)0);
456 m->pmatch[i].rm_so = sp - m->offp;
457 break;
458 case ORPAREN(14LU<<((unsigned)27)):
459 i = OPND(m->g->strip[ss])((m->g->strip[ss])&0x07ffffffLU);
460 assert(0 < i && i <= m->g->nsub)((void)0);
461 m->pmatch[i].rm_eo = sp - m->offp;
462 break;
463 default: /* uh oh */
464 assert(nope)((void)0);
465 break;
466 }
467 }
468
469 assert(sp == stop)((void)0);
470 return(sp);
471}
472
473/*
474 - backref - figure out what matched what, figuring in back references
475 */
476static const char * /* == stop (success) or NULL (failure) */
477backref(struct match *m, const char *start, const char *stop, sopno startst,
478 sopno stopst, sopno lev, int rec) /* PLUS nesting level */
479{
480 int i;
481 sopno ss; /* start sop of current subRE */
482 const char *sp; /* start of string matched by it */
483 sopno ssub; /* start sop of subsubRE */
484 sopno esub; /* end sop of subsubRE */
485 const char *ssp;/* start of string matched by subsubRE */
486 const char *dp;
487 size_t len;
488 int hard;
489 sop s;
490 regoff_t offsave;
491 cset *cs;
492
493 AT("back", start, stop, startst, stopst);
494 sp = start;
495
496 /* get as far as we can with easy stuff */
497 hard = 0;
498 for (ss = startst; !hard && ss < stopst; ss++)
499 switch (OP(s = m->g->strip[ss])((s = m->g->strip[ss])&0xf8000000LU)) {
500 case OCHAR(2LU<<((unsigned)27)):
501 if (sp == stop || *sp++ != (char)OPND(s)((s)&0x07ffffffLU))
502 return(NULL((void *)0));
503 break;
504 case OANY(5LU<<((unsigned)27)):
505 if (sp == stop)
506 return(NULL((void *)0));
507 sp++;
508 break;
509 case OANYOF(6LU<<((unsigned)27)):
510 cs = &m->g->sets[OPND(s)((s)&0x07ffffffLU)];
511 if (sp == stop || !CHIN(cs, *sp++))
512 return(NULL((void *)0));
513 break;
514 case OBOL(3LU<<((unsigned)27)):
515 if ((sp == m->beginp && !(m->eflags&REG_NOTBOL00001)) ||
516 (sp > m->offp && sp < m->endp &&
517 *(sp-1) == '\n' && (m->g->cflags&REG_NEWLINE0010)))
518 { /* yes */ }
519 else
520 return(NULL((void *)0));
521 break;
522 case OEOL(4LU<<((unsigned)27)):
523 if ( (sp == m->endp && !(m->eflags&REG_NOTEOL00002)) ||
524 (sp < m->endp && *sp == '\n' &&
525 (m->g->cflags&REG_NEWLINE0010)) )
526 { /* yes */ }
527 else
528 return(NULL((void *)0));
529 break;
530 case OBOW(19LU<<((unsigned)27)):
531 if (sp < m->endp && ISWORD(*sp)(isalnum(*sp) || (*sp) == '_') &&
532 ((sp == m->beginp && !(m->eflags&REG_NOTBOL00001)) ||
533 (sp > m->offp && !ISWORD(*(sp-1))(isalnum(*(sp-1)) || (*(sp-1)) == '_'))))
534 { /* yes */ }
535 else
536 return(NULL((void *)0));
537 break;
538 case OEOW(20LU<<((unsigned)27)):
539 if (( (sp == m->endp && !(m->eflags&REG_NOTEOL00002)) ||
540 (sp < m->endp && *sp == '\n' &&
541 (m->g->cflags&REG_NEWLINE0010)) ||
542 (sp < m->endp && !ISWORD(*sp)(isalnum(*sp) || (*sp) == '_')) ) &&
543 (sp > m->beginp && ISWORD(*(sp-1))(isalnum(*(sp-1)) || (*(sp-1)) == '_')) )
544 { /* yes */ }
545 else
546 return(NULL((void *)0));
547 break;
548 case O_QUEST(12LU<<((unsigned)27)):
549 break;
550 case OOR1(16LU<<((unsigned)27)): /* matches null but needs to skip */
551 ss++;
552 s = m->g->strip[ss];
553 do {
554 assert(OP(s) == OOR2)((void)0);
555 ss += OPND(s)((s)&0x07ffffffLU);
556 } while (OP(s = m->g->strip[ss])((s = m->g->strip[ss])&0xf8000000LU) != O_CH(18LU<<((unsigned)27)));
557 /* note that the ss++ gets us past the O_CH */
558 break;
559 default: /* have to make a choice */
560 hard = 1;
561 break;
562 }
563 if (!hard) { /* that was it! */
564 if (sp != stop)
565 return(NULL((void *)0));
566 return(sp);
567 }
568 ss--; /* adjust for the for's final increment */
569
570 /* the hard stuff */
571 AT("hard", sp, stop, ss, stopst);
572 s = m->g->strip[ss];
573 switch (OP(s)((s)&0xf8000000LU)) {
574 case OBACK_(7LU<<((unsigned)27)): /* the vilest depths */
575 i = OPND(s)((s)&0x07ffffffLU);
576 assert(0 < i && i <= m->g->nsub)((void)0);
577 if (m->pmatch[i].rm_eo == -1)
578 return(NULL((void *)0));
579 assert(m->pmatch[i].rm_so != -1)((void)0);
580 len = m->pmatch[i].rm_eo - m->pmatch[i].rm_so;
581 if (len == 0 && rec++ > MAX_RECURSION100)
582 return(NULL((void *)0));
583 assert(stop - m->beginp >= len)((void)0);
584 if (sp > stop - len)
585 return(NULL((void *)0)); /* not enough left to match */
586 ssp = m->offp + m->pmatch[i].rm_so;
587 if (memcmp(sp, ssp, len) != 0)
588 return(NULL((void *)0));
589 while (m->g->strip[ss] != SOP(O_BACK, i)(((8LU<<((unsigned)27)))|(i)))
590 ss++;
591 return(backref(m, sp+len, stop, ss+1, stopst, lev, rec));
592 break;
593 case OQUEST_(11LU<<((unsigned)27)): /* to null or not */
594 dp = backref(m, sp, stop, ss+1, stopst, lev, rec);
595 if (dp != NULL((void *)0))
596 return(dp); /* not */
597 return(backref(m, sp, stop, ss+OPND(s)((s)&0x07ffffffLU)+1, stopst, lev, rec));
598 break;
599 case OPLUS_(9LU<<((unsigned)27)):
600 assert(m->lastpos != NULL)((void)0);
601 assert(lev+1 <= m->g->nplus)((void)0);
602 m->lastpos[lev+1] = sp;
603 return(backref(m, sp, stop, ss+1, stopst, lev+1, rec));
604 break;
605 case O_PLUS(10LU<<((unsigned)27)):
606 if (sp == m->lastpos[lev]) /* last pass matched null */
607 return(backref(m, sp, stop, ss+1, stopst, lev-1, rec));
608 /* try another pass */
609 m->lastpos[lev] = sp;
610 dp = backref(m, sp, stop, ss-OPND(s)((s)&0x07ffffffLU)+1, stopst, lev, rec);
611 if (dp == NULL((void *)0))
612 return(backref(m, sp, stop, ss+1, stopst, lev-1, rec));
613 else
614 return(dp);
615 break;
616 case OCH_(15LU<<((unsigned)27)): /* find the right one, if any */
617 ssub = ss + 1;
618 esub = ss + OPND(s)((s)&0x07ffffffLU) - 1;
619 assert(OP(m->g->strip[esub]) == OOR1)((void)0);
620 for (;;) { /* find first matching branch */
621 dp = backref(m, sp, stop, ssub, esub, lev, rec);
622 if (dp != NULL((void *)0))
623 return(dp);
624 /* that one missed, try next one */
625 if (OP(m->g->strip[esub])((m->g->strip[esub])&0xf8000000LU) == O_CH(18LU<<((unsigned)27)))
626 return(NULL((void *)0)); /* there is none */
627 esub++;
628 assert(OP(m->g->strip[esub]) == OOR2)((void)0);
629 ssub = esub + 1;
630 esub += OPND(m->g->strip[esub])((m->g->strip[esub])&0x07ffffffLU);
631 if (OP(m->g->strip[esub])((m->g->strip[esub])&0xf8000000LU) == OOR2(17LU<<((unsigned)27)))
632 esub--;
633 else
634 assert(OP(m->g->strip[esub]) == O_CH)((void)0);
635 }
636 break;
637 case OLPAREN(13LU<<((unsigned)27)): /* must undo assignment if rest fails */
638 i = OPND(s)((s)&0x07ffffffLU);
639 assert(0 < i && i <= m->g->nsub)((void)0);
640 offsave = m->pmatch[i].rm_so;
641 m->pmatch[i].rm_so = sp - m->offp;
642 dp = backref(m, sp, stop, ss+1, stopst, lev, rec);
643 if (dp != NULL((void *)0))
644 return(dp);
645 m->pmatch[i].rm_so = offsave;
646 return(NULL((void *)0));
647 break;
648 case ORPAREN(14LU<<((unsigned)27)): /* must undo assignment if rest fails */
649 i = OPND(s)((s)&0x07ffffffLU);
650 assert(0 < i && i <= m->g->nsub)((void)0);
651 offsave = m->pmatch[i].rm_eo;
652 m->pmatch[i].rm_eo = sp - m->offp;
653 dp = backref(m, sp, stop, ss+1, stopst, lev, rec);
654 if (dp != NULL((void *)0))
655 return(dp);
656 m->pmatch[i].rm_eo = offsave;
657 return(NULL((void *)0));
658 break;
659 default: /* uh oh */
660 assert(nope)((void)0);
661 break;
662 }
663
664 /* "can't happen" */
665 assert(nope)((void)0);
666 /* NOTREACHED */
667 return NULL((void *)0);
668}
669
670/*
671 - fast - step through the string at top speed
672 */
673static const char * /* where tentative match ended, or NULL */
674fast(struct match *m, const char *start, const char *stop, sopno startst,
675 sopno stopst)
676{
677 stateschar * st = m->st;
678 stateschar * fresh = m->fresh;
679 stateschar * tmp = m->tmp;
680 const char *p = start;
681 int c;
682 int lastc; /* previous c */
683 int flagch;
684 int i;
685 const char *coldp; /* last p after which no match was underway */
686
687 if (start == m->offp || (start == m->beginp && !(m->eflags&REG_NOTBOL00001)))
688 c = OUT(127 +1);
689 else
690 c = *(start-1);
691
692 CLEAR(st)memset(st, 0, m->g->nstates);
693 SET1(st, startst)((st)[startst] = 1);
694 st = step(m->g, startst, stopst, st, NOTHING(((127 +1)+1)+3), st);
695 ASSIGN(fresh, st)memcpy(fresh, st, m->g->nstates);
696 SP("start", st, *p);
697 coldp = NULL((void *)0);
698 for (;;) {
699 /* next character */
700 lastc = c;
701 c = (p == m->endp) ? OUT(127 +1) : *p;
702 if (EQ(st, fresh)(memcmp(st, fresh, m->g->nstates) == 0))
703 coldp = p;
704
705 /* is there an EOL and/or BOL between lastc and c? */
706 flagch = '\0';
707 i = 0;
708 if ((lastc == '\n' && m->g->cflags&REG_NEWLINE0010) ||
709 (lastc == OUT(127 +1) && !(m->eflags&REG_NOTBOL00001))) {
710 flagch = BOL((127 +1)+1);
711 i = m->g->nbol;
712 }
713 if ((c == '\n' && m->g->cflags&REG_NEWLINE0010) ||
714 (c == OUT(127 +1) && !(m->eflags&REG_NOTEOL00002)) ) {
715 flagch = (flagch == BOL((127 +1)+1)) ? BOLEOL(((127 +1)+1)+2) : EOL(((127 +1)+1)+1);
716 i += m->g->neol;
717 }
718 if (i != 0) {
719 for (; i > 0; i--)
720 st = step(m->g, startst, stopst,
721 st, flagch, st);
722 SP("boleol", st, c);
723 }
724
725 /* how about a word boundary? */
726 if ((flagch == BOL((127 +1)+1) || (lastc != OUT(127 +1) && !ISWORD(lastc)(isalnum(lastc) || (lastc) == '_'))) &&
727 (c != OUT(127 +1) && ISWORD(c)(isalnum(c) || (c) == '_')))
728 flagch = BOW(((127 +1)+1)+4);
729 if ((lastc != OUT(127 +1) && ISWORD(lastc)(isalnum(lastc) || (lastc) == '_')) &&
730 (flagch == EOL(((127 +1)+1)+1) || (c != OUT(127 +1) && !ISWORD(c)(isalnum(c) || (c) == '_'))))
731 flagch = EOW(((127 +1)+1)+5);
732 if (flagch == BOW(((127 +1)+1)+4) || flagch == EOW(((127 +1)+1)+5)) {
733 st = step(m->g, startst, stopst, st, flagch, st);
734 SP("boweow", st, c);
735 }
736
737 /* are we done? */
738 if (ISSET(st, stopst)((st)[stopst]) || p == stop)
739 break; /* NOTE BREAK OUT */
740
741 /* no, we must deal with this character */
742 ASSIGN(tmp, st)memcpy(tmp, st, m->g->nstates);
743 ASSIGN(st, fresh)memcpy(st, fresh, m->g->nstates);
744 assert(c != OUT)((void)0);
745 st = step(m->g, startst, stopst, tmp, c, st);
746 SP("aft", st, c);
747 assert(EQ(step(m->g, startst, stopst, st, NOTHING, st), st))((void)0);
748 p++;
749 }
750
751 assert(coldp != NULL)((void)0);
752 m->coldp = coldp;
753 if (ISSET(st, stopst)((st)[stopst]))
754 return(p+1);
755 else
756 return(NULL((void *)0));
757}
758
759/*
760 - slow - step through the string more deliberately
761 */
762static const char * /* where it ended */
763slow(struct match *m, const char *start, const char *stop, sopno startst,
764 sopno stopst)
765{
766 stateschar * st = m->st;
767 stateschar * empty = m->empty;
768 stateschar * tmp = m->tmp;
769 const char *p = start;
770 int c;
771 int lastc; /* previous c */
772 int flagch;
773 int i;
774 const char *matchp; /* last p at which a match ended */
775
776 if (start == m->offp || (start == m->beginp && !(m->eflags&REG_NOTBOL00001)))
777 c = OUT(127 +1);
778 else
779 c = *(start-1);
780
781 AT("slow", start, stop, startst, stopst);
782 CLEAR(st)memset(st, 0, m->g->nstates);
783 SET1(st, startst)((st)[startst] = 1);
784 SP("sstart", st, *p);
785 st = step(m->g, startst, stopst, st, NOTHING(((127 +1)+1)+3), st);
786 matchp = NULL((void *)0);
787 for (;;) {
788 /* next character */
789 lastc = c;
790 c = (p == m->endp) ? OUT(127 +1) : *p;
791
792 /* is there an EOL and/or BOL between lastc and c? */
793 flagch = '\0';
794 i = 0;
795 if ((lastc == '\n' && m->g->cflags&REG_NEWLINE0010) ||
796 (lastc == OUT(127 +1) && !(m->eflags&REG_NOTBOL00001))) {
797 flagch = BOL((127 +1)+1);
798 i = m->g->nbol;
799 }
800 if ((c == '\n' && m->g->cflags&REG_NEWLINE0010) ||
801 (c == OUT(127 +1) && !(m->eflags&REG_NOTEOL00002))) {
802 flagch = (flagch == BOL((127 +1)+1)) ? BOLEOL(((127 +1)+1)+2) : EOL(((127 +1)+1)+1);
803 i += m->g->neol;
804 }
805 if (i != 0) {
806 for (; i > 0; i--)
807 st = step(m->g, startst, stopst,
808 st, flagch, st);
809 SP("sboleol", st, c);
810 }
811
812 /* how about a word boundary? */
813 if ((flagch == BOL((127 +1)+1) || (lastc != OUT(127 +1) && !ISWORD(lastc)(isalnum(lastc) || (lastc) == '_'))) &&
814 (c != OUT(127 +1) && ISWORD(c)(isalnum(c) || (c) == '_')))
815 flagch = BOW(((127 +1)+1)+4);
816 if ((lastc != OUT(127 +1) && ISWORD(lastc)(isalnum(lastc) || (lastc) == '_')) &&
817 (flagch == EOL(((127 +1)+1)+1) || (c != OUT(127 +1) && !ISWORD(c)(isalnum(c) || (c) == '_'))))
818 flagch = EOW(((127 +1)+1)+5);
819 if (flagch == BOW(((127 +1)+1)+4) || flagch == EOW(((127 +1)+1)+5)) {
820 st = step(m->g, startst, stopst, st, flagch, st);
821 SP("sboweow", st, c);
822 }
823
824 /* are we done? */
825 if (ISSET(st, stopst)((st)[stopst]))
826 matchp = p;
827 if (EQ(st, empty)(memcmp(st, empty, m->g->nstates) == 0) || p == stop)
828 break; /* NOTE BREAK OUT */
829
830 /* no, we must deal with this character */
831 ASSIGN(tmp, st)memcpy(tmp, st, m->g->nstates);
832 ASSIGN(st, empty)memcpy(st, empty, m->g->nstates);
833 assert(c != OUT)((void)0);
834 st = step(m->g, startst, stopst, tmp, c, st);
835 SP("saft", st, c);
836 assert(EQ(step(m->g, startst, stopst, st, NOTHING, st), st))((void)0);
837 p++;
838 }
839
840 return(matchp);
841}
842
843
844/*
845 - step - map set of states reachable before char to set reachable after
846 */
847static stateschar *
848step(struct re_guts *g,
849 sopno start, /* start state within strip */
850 sopno stop, /* state after stop state within strip */
851 stateschar * bef, /* states reachable before */
852 int ch, /* character or NONCHAR code */
853 stateschar * aft) /* states already known reachable after */
854{
855 cset *cs;
856 sop s;
857 sopno pc;
858 onestatelong here; /* note, macros know this name */
859 sopno look;
860 int i;
861
862 for (pc = start, INIT(here, pc)((here) = (pc)); pc != stop; pc++, INC(here)((here)++)) {
863 s = g->strip[pc];
864 switch (OP(s)((s)&0xf8000000LU)) {
865 case OEND(1LU<<((unsigned)27)):
866 assert(pc == stop-1)((void)0);
867 break;
868 case OCHAR(2LU<<((unsigned)27)):
869 /* only characters can match */
870 assert(!NONCHAR(ch) || ch != (char)OPND(s))((void)0);
871 if (ch == (char)OPND(s)((s)&0x07ffffffLU))
872 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
873 break;
874 case OBOL(3LU<<((unsigned)27)):
875 if (ch == BOL((127 +1)+1) || ch == BOLEOL(((127 +1)+1)+2))
876 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
877 break;
878 case OEOL(4LU<<((unsigned)27)):
879 if (ch == EOL(((127 +1)+1)+1) || ch == BOLEOL(((127 +1)+1)+2))
880 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
881 break;
882 case OBOW(19LU<<((unsigned)27)):
883 if (ch == BOW(((127 +1)+1)+4))
884 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
885 break;
886 case OEOW(20LU<<((unsigned)27)):
887 if (ch == EOW(((127 +1)+1)+5))
888 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
889 break;
890 case OANY(5LU<<((unsigned)27)):
891 if (!NONCHAR(ch)((ch) > 127))
892 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
893 break;
894 case OANYOF(6LU<<((unsigned)27)):
895 cs = &g->sets[OPND(s)((s)&0x07ffffffLU)];
896 if (!NONCHAR(ch)((ch) > 127) && CHIN(cs, ch))
897 FWD(aft, bef, 1)((aft)[here+(1)] |= (bef)[here]);
898 break;
899 case OBACK_(7LU<<((unsigned)27)): /* ignored here */
900 case O_BACK(8LU<<((unsigned)27)):
901 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
902 break;
903 case OPLUS_(9LU<<((unsigned)27)): /* forward, this is just an empty */
904 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
905 break;
906 case O_PLUS(10LU<<((unsigned)27)): /* both forward and back */
907 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
908 i = ISSETBACK(aft, OPND(s))((aft)[here - (((s)&0x07ffffffLU))]);
909 BACK(aft, aft, OPND(s))((aft)[here-(((s)&0x07ffffffLU))] |= (aft)[here]);
910 if (!i && ISSETBACK(aft, OPND(s))((aft)[here - (((s)&0x07ffffffLU))])) {
911 /* oho, must reconsider loop body */
912 pc -= OPND(s)((s)&0x07ffffffLU) + 1;
913 INIT(here, pc)((here) = (pc));
914 }
915 break;
916 case OQUEST_(11LU<<((unsigned)27)): /* two branches, both forward */
917 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
918 FWD(aft, aft, OPND(s))((aft)[here+(((s)&0x07ffffffLU))] |= (aft)[here]);
919 break;
920 case O_QUEST(12LU<<((unsigned)27)): /* just an empty */
921 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
922 break;
923 case OLPAREN(13LU<<((unsigned)27)): /* not significant here */
924 case ORPAREN(14LU<<((unsigned)27)):
925 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
926 break;
927 case OCH_(15LU<<((unsigned)27)): /* mark the first two branches */
928 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
929 assert(OP(g->strip[pc+OPND(s)]) == OOR2)((void)0);
930 FWD(aft, aft, OPND(s))((aft)[here+(((s)&0x07ffffffLU))] |= (aft)[here]);
931 break;
932 case OOR1(16LU<<((unsigned)27)): /* done a branch, find the O_CH */
933 if (ISSTATEIN(aft, here)((aft)[here])) {
934 for (look = 1;
935 OP(s = g->strip[pc+look])((s = g->strip[pc+look])&0xf8000000LU) != O_CH(18LU<<((unsigned)27));
936 look += OPND(s)((s)&0x07ffffffLU))
937 assert(OP(s) == OOR2)((void)0);
938 FWD(aft, aft, look + 1)((aft)[here+(look + 1)] |= (aft)[here]);
939 }
940 break;
941 case OOR2(17LU<<((unsigned)27)): /* propagate OCH_'s marking */
942 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
943 if (OP(g->strip[pc+OPND(s)])((g->strip[pc+((s)&0x07ffffffLU)])&0xf8000000LU) != O_CH(18LU<<((unsigned)27))) {
944 assert(OP(g->strip[pc+OPND(s)]) == OOR2)((void)0);
945 FWD(aft, aft, OPND(s))((aft)[here+(((s)&0x07ffffffLU))] |= (aft)[here]);
946 }
947 break;
948 case O_CH(18LU<<((unsigned)27)): /* just empty */
949 FWD(aft, aft, 1)((aft)[here+(1)] |= (aft)[here]);
950 break;
951 default: /* ooooops... */
952 assert(nope)((void)0);
953 break;
954 }
955 }
956
957 return(aft);
958}
959
960#ifdef REDEBUG
961/*
962 - print - print a set of states
963 */
964static void
965print(struct match *m, const char *caption, stateschar * st, int ch, FILE *d)
966{
967 struct re_guts *g = m->g;
968 int i;
969 int first = 1;
970
971 if (!(m->eflags&REG_TRACE00400))
972 return;
973
974 (void)fprintf(d, "%s", caption);
975 (void)fprintf(d, " %s", pchar(ch));
976 for (i = 0; i < g->nstates; i++) {
977 if (ISSET(st, i)((st)[i])) {
978 (void)fprintf(d, "%s%d", (first) ? "\t" : ", ", i);
979 first = 0;
980 }
981 }
982 (void)fprintf(d, "\n");
983}
984
985/*
986 - at - print current situation
987 */
988static void
989at(struct match *m, const char *title, const char *start, const char *stop,
990 sopno startst, sopno stopst)
991{
992 if (!(m->eflags&REG_TRACE00400))
993 return;
994
995 (void)printf("%s %s-", title, pchar(*start));
996 (void)printf("%s ", pchar(*stop));
997 (void)printf("%ld-%ld\n", (long)startst, (long)stopst);
998}
999
1000#ifndef PCHARDONE
1001#define PCHARDONE /* never again */
1002static const char *nonchars[] =
1003 { "OUT", "BOL", "EOL", "BOLEOL", "NOTHING", "BOW", "EOW" };
1004#define PNONCHAR(c) \
1005 ((c) - OUT(127 +1) < (sizeof(nonchars)/sizeof(nonchars[0])) \
1006 ? nonchars[(c) - OUT(127 +1)] : "invalid")
1007
1008/*
1009 - pchar - make a character printable
1010 *
1011 * Is this identical to regchar() over in debug.c? Well, yes. But a
1012 * duplicate here avoids having a debugging-capable regexec.o tied to
1013 * a matching debug.o, and this is convenient. It all disappears in
1014 * the non-debug compilation anyway, so it doesn't matter much.
1015 */
1016static const char * /* -> representation */
1017pchar(int ch)
1018{
1019 static char pbuf[10];
1020
1021 if (NONCHAR(ch)((ch) > 127)) {
1022 if (ch - OUT(127 +1) < (sizeof(nonchars)/sizeof(nonchars[0])))
1023 return nonchars[ch - OUT(127 +1)];
1024 return "invalid";
1025 }
1026 if (isprint((unsigned char)ch) || ch == ' ')
1027 (void)snprintf(pbuf, sizeof pbuf, "%c", ch);
1028 else
1029 (void)snprintf(pbuf, sizeof pbuf, "\\%o", ch);
1030 return(pbuf);
1031}
1032#endif
1033#endif
1034
1035#undef matcher
1036#undef fast
1037#undef slow
1038#undef dissect
1039#undef backref
1040#undef step
1041#undef print
1042#undef at
1043#undef match
1044#undef nope