forked from onetrueawk/awk
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathb.c
1562 lines (1420 loc) · 37.1 KB
/
b.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/****************************************************************
Copyright (C) Lucent Technologies 1997
All Rights Reserved
Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name Lucent Technologies or any of
its entities not be used in advertising or publicity pertaining
to distribution of the software without specific, written prior
permission.
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
****************************************************************/
/* lasciate ogne speranza, voi ch'intrate. */
#define DEBUG
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "awk.h"
#include "awkgram.tab.h"
#define MAXLIN 22
#define type(v) (v)->nobj /* badly overloaded here */
#define info(v) (v)->ntype /* badly overloaded here */
#define left(v) (v)->narg[0]
#define right(v) (v)->narg[1]
#define parent(v) (v)->nnext
#define LEAF case CCL: case NCCL: case CHAR: case DOT: case FINAL: case ALL:
#define ELEAF case EMPTYRE: /* empty string in regexp */
#define UNARY case STAR: case PLUS: case QUEST:
/* encoding in tree Nodes:
leaf (CCL, NCCL, CHAR, DOT, FINAL, ALL, EMPTYRE):
left is index, right contains value or pointer to value
unary (STAR, PLUS, QUEST): left is child, right is null
binary (CAT, OR): left and right are children
parent contains pointer to parent
*/
int *setvec;
int *tmpset;
int maxsetvec = 0;
int rtok; /* next token in current re */
int rlxval;
static const uschar *rlxstr;
static const uschar *prestr; /* current position in current re */
static const uschar *lastre; /* origin of last re */
static const uschar *lastatom; /* origin of last Atom */
static const uschar *starttok;
static const uschar *basestr; /* starts with original, replaced during
repetition processing */
static const uschar *firstbasestr;
static int setcnt;
static int poscnt;
const char *patbeg;
int patlen;
#define NFA 128 /* cache this many dynamic fa's */
fa *fatab[NFA];
int nfatab = 0; /* entries in fatab */
extern int u8_nextlen(const char *s);
/* utf-8 mechanism:
For most of Awk, utf-8 strings just "work", since they look like
null-terminated sequences of 8-bit bytes.
Functions like length(), index(), and substr() have to operate
in units of utf-8 characters. The u8_* functions in run.c
handle this.
Regular expressions are more complicated, since the basic
mechanism of the goto table used 8-bit byte indices into the
gototab entries to compute the next state. Unicode is a lot
bigger, so the gototab entries are now structs with a character
and a next state. These are sorted by code point and binary
searched.
Throughout the RE mechanism in b.c, utf-8 characters are
converted to their utf-32 value. This mostly shows up in
cclenter, which expands character class ranges like a-z and now
alpha-omega. The size of a gototab array is still about 256.
This should be dynamic, but for now things work ok for a single
code page of Unicode, which is the most likely case.
The code changes are localized in run.c and b.c. I have added a
handful of functions to somewhat better hide the implementation,
but a lot more could be done.
*/
static int entry_cmp(const void *l, const void *r);
static int get_gototab(fa*, int, int);
static int set_gototab(fa*, int, int, int);
static void clear_gototab(fa*, int);
extern int u8_rune(int *, const char *);
static int *
intalloc(size_t n, const char *f)
{
int *p = (int *) calloc(n, sizeof(int));
if (p == NULL)
overflo(f);
return p;
}
static void
resizesetvec(const char *f)
{
if (maxsetvec == 0)
maxsetvec = MAXLIN;
else
maxsetvec *= 4;
setvec = (int *) realloc(setvec, maxsetvec * sizeof(*setvec));
tmpset = (int *) realloc(tmpset, maxsetvec * sizeof(*tmpset));
if (setvec == NULL || tmpset == NULL)
overflo(f);
}
static void
resize_state(fa *f, int state)
{
gtt *p;
uschar *p2;
int **p3;
int i, new_count;
if (++state < f->state_count)
return;
new_count = state + 10; /* needs to be tuned */
p = (gtt *) realloc(f->gototab, new_count * sizeof(gtt));
if (p == NULL)
goto out;
f->gototab = p;
p2 = (uschar *) realloc(f->out, new_count * sizeof(f->out[0]));
if (p2 == NULL)
goto out;
f->out = p2;
p3 = (int **) realloc(f->posns, new_count * sizeof(f->posns[0]));
if (p3 == NULL)
goto out;
f->posns = p3;
for (i = f->state_count; i < new_count; ++i) {
f->gototab[i].entries = (gtte *) calloc(NCHARS, sizeof(gtte));
if (f->gototab[i].entries == NULL)
goto out;
f->gototab[i].allocated = NCHARS;
f->gototab[i].inuse = 0;
f->out[i] = 0;
f->posns[i] = NULL;
}
f->state_count = new_count;
return;
out:
overflo(__func__);
}
fa *makedfa(const char *s, bool anchor) /* returns dfa for reg expr s */
{
int i, use, nuse;
fa *pfa;
static int now = 1;
if (setvec == NULL) { /* first time through any RE */
resizesetvec(__func__);
}
if (compile_time != RUNNING) /* a constant for sure */
return mkdfa(s, anchor);
for (i = 0; i < nfatab; i++) /* is it there already? */
if (fatab[i]->anchor == anchor
&& strcmp((const char *) fatab[i]->restr, s) == 0) {
fatab[i]->use = now++;
return fatab[i];
}
pfa = mkdfa(s, anchor);
if (nfatab < NFA) { /* room for another */
fatab[nfatab] = pfa;
fatab[nfatab]->use = now++;
nfatab++;
return pfa;
}
use = fatab[0]->use; /* replace least-recently used */
nuse = 0;
for (i = 1; i < nfatab; i++)
if (fatab[i]->use < use) {
use = fatab[i]->use;
nuse = i;
}
freefa(fatab[nuse]);
fatab[nuse] = pfa;
pfa->use = now++;
return pfa;
}
fa *mkdfa(const char *s, bool anchor) /* does the real work of making a dfa */
/* anchor = true for anchored matches, else false */
{
Node *p, *p1;
fa *f;
firstbasestr = (const uschar *) s;
basestr = firstbasestr;
p = reparse(s);
p1 = op2(CAT, op2(STAR, op2(ALL, NIL, NIL), NIL), p);
/* put ALL STAR in front of reg. exp. */
p1 = op2(CAT, p1, op2(FINAL, NIL, NIL));
/* put FINAL after reg. exp. */
poscnt = 0;
penter(p1); /* enter parent pointers and leaf indices */
if ((f = (fa *) calloc(1, sizeof(fa) + poscnt * sizeof(rrow))) == NULL)
overflo(__func__);
f->accept = poscnt-1; /* penter has computed number of positions in re */
cfoll(f, p1); /* set up follow sets */
freetr(p1);
resize_state(f, 1);
f->posns[0] = intalloc(*(f->re[0].lfollow), __func__);
f->posns[1] = intalloc(1, __func__);
*f->posns[1] = 0;
f->initstat = makeinit(f, anchor);
f->anchor = anchor;
f->restr = (uschar *) tostring(s);
if (firstbasestr != basestr) {
if (basestr)
xfree(basestr);
}
return f;
}
int makeinit(fa *f, bool anchor)
{
int i, k;
f->curstat = 2;
f->out[2] = 0;
k = *(f->re[0].lfollow);
xfree(f->posns[2]);
f->posns[2] = intalloc(k + 1, __func__);
for (i = 0; i <= k; i++) {
(f->posns[2])[i] = (f->re[0].lfollow)[i];
}
if ((f->posns[2])[1] == f->accept)
f->out[2] = 1;
clear_gototab(f, 2);
f->curstat = cgoto(f, 2, HAT);
if (anchor) {
*f->posns[2] = k-1; /* leave out position 0 */
for (i = 0; i < k; i++) {
(f->posns[0])[i] = (f->posns[2])[i];
}
f->out[0] = f->out[2];
if (f->curstat != 2)
--(*f->posns[f->curstat]);
}
return f->curstat;
}
void penter(Node *p) /* set up parent pointers and leaf indices */
{
switch (type(p)) {
ELEAF
LEAF
info(p) = poscnt;
poscnt++;
break;
UNARY
penter(left(p));
parent(left(p)) = p;
break;
case CAT:
case OR:
penter(left(p));
penter(right(p));
parent(left(p)) = p;
parent(right(p)) = p;
break;
case ZERO:
break;
default: /* can't happen */
FATAL("can't happen: unknown type %d in penter", type(p));
break;
}
}
void freetr(Node *p) /* free parse tree */
{
switch (type(p)) {
ELEAF
LEAF
xfree(p);
break;
UNARY
case ZERO:
freetr(left(p));
xfree(p);
break;
case CAT:
case OR:
freetr(left(p));
freetr(right(p));
xfree(p);
break;
default: /* can't happen */
FATAL("can't happen: unknown type %d in freetr", type(p));
break;
}
}
/* in the parsing of regular expressions, metacharacters like . have */
/* to be seen literally; \056 is not a metacharacter. */
int hexstr(const uschar **pp, int max) /* find and eval hex string at pp, return new p */
{ /* only pick up one 8-bit byte (2 chars) */
const uschar *p;
int n = 0;
int i;
for (i = 0, p = *pp; i < max && isxdigit(*p); i++, p++) {
if (isdigit((int) *p))
n = 16 * n + *p - '0';
else if (*p >= 'a' && *p <= 'f')
n = 16 * n + *p - 'a' + 10;
else if (*p >= 'A' && *p <= 'F')
n = 16 * n + *p - 'A' + 10;
}
*pp = p;
return n;
}
#define isoctdigit(c) ((c) >= '0' && (c) <= '7') /* multiple use of arg */
int quoted(const uschar **pp) /* pick up next thing after a \\ */
/* and increment *pp */
{
const uschar *p = *pp;
int c;
/* BUG: should advance by utf-8 char even if makes no sense */
if ((c = *p++) == 't') {
c = '\t';
} else if (c == 'n') {
c = '\n';
} else if (c == 'f') {
c = '\f';
} else if (c == 'r') {
c = '\r';
} else if (c == 'b') {
c = '\b';
} else if (c == 'v') {
c = '\v';
} else if (c == 'a') {
c = '\a';
} else if (c == '\\') {
c = '\\';
} else if (c == 'x') { /* 2 hex digits follow */
c = hexstr(&p, 2); /* this adds a null if number is invalid */
} else if (c == 'u') { /* unicode char number up to 8 hex digits */
c = hexstr(&p, 8);
} else if (isoctdigit(c)) { /* \d \dd \ddd */
int n = c - '0';
if (isoctdigit(*p)) {
n = 8 * n + *p++ - '0';
if (isoctdigit(*p))
n = 8 * n + *p++ - '0';
}
c = n;
} /* else */
/* c = c; */
*pp = p;
return c;
}
int *cclenter(const char *argp) /* add a character class */
{
int i, c, c2;
int n;
const uschar *p = (const uschar *) argp;
int *bp, *retp;
static int *buf = NULL;
static int bufsz = 100;
if (buf == NULL && (buf = (int *) calloc(bufsz, sizeof(int))) == NULL)
FATAL("out of space for character class [%.10s...] 1", p);
bp = buf;
for (i = 0; *p != 0; ) {
n = u8_rune(&c, (const char *) p);
p += n;
if (c == '\\') {
c = quoted(&p);
} else if (c == '-' && i > 0 && bp[-1] != 0) {
if (*p != 0) {
c = bp[-1];
/* c2 = *p++; */
n = u8_rune(&c2, (const char *) p);
p += n;
if (c2 == '\\')
c2 = quoted(&p); /* BUG: sets p, has to be u8 size */
if (c > c2) { /* empty; ignore */
bp--;
i--;
continue;
}
while (c < c2) {
if (i >= bufsz) {
bufsz *= 2;
buf = (int *) realloc(buf, bufsz * sizeof(int));
if (buf == NULL)
FATAL("out of space for character class [%.10s...] 2", p);
bp = buf + i;
}
*bp++ = ++c;
i++;
}
continue;
}
}
if (i >= bufsz) {
bufsz *= 2;
buf = (int *) realloc(buf, bufsz * sizeof(int));
if (buf == NULL)
FATAL("out of space for character class [%.10s...] 2", p);
bp = buf + i;
}
*bp++ = c;
i++;
}
*bp = 0;
/* DPRINTF("cclenter: in = |%s|, out = |%s|\n", op, buf); BUG: can't print array of int */
/* xfree(op); BUG: what are we freeing here? */
retp = (int *) calloc(bp-buf+1, sizeof(int));
for (i = 0; i < bp-buf+1; i++)
retp[i] = buf[i];
return retp;
}
void overflo(const char *s)
{
FATAL("regular expression too big: out of space in %.30s...", s);
}
void cfoll(fa *f, Node *v) /* enter follow set of each leaf of vertex v into lfollow[leaf] */
{
int i;
int *p;
switch (type(v)) {
ELEAF
LEAF
f->re[info(v)].ltype = type(v);
f->re[info(v)].lval.np = right(v);
while (f->accept >= maxsetvec) { /* guessing here! */
resizesetvec(__func__);
}
for (i = 0; i <= f->accept; i++)
setvec[i] = 0;
setcnt = 0;
follow(v); /* computes setvec and setcnt */
p = intalloc(setcnt + 1, __func__);
f->re[info(v)].lfollow = p;
*p = setcnt;
for (i = f->accept; i >= 0; i--)
if (setvec[i] == 1)
*++p = i;
break;
UNARY
cfoll(f,left(v));
break;
case CAT:
case OR:
cfoll(f,left(v));
cfoll(f,right(v));
break;
case ZERO:
break;
default: /* can't happen */
FATAL("can't happen: unknown type %d in cfoll", type(v));
}
}
int first(Node *p) /* collects initially active leaves of p into setvec */
/* returns 0 if p matches empty string */
{
int b, lp;
switch (type(p)) {
ELEAF
LEAF
lp = info(p); /* look for high-water mark of subscripts */
while (setcnt >= maxsetvec || lp >= maxsetvec) { /* guessing here! */
resizesetvec(__func__);
}
if (type(p) == EMPTYRE) {
setvec[lp] = 0;
return(0);
}
if (setvec[lp] != 1) {
setvec[lp] = 1;
setcnt++;
}
if (type(p) == CCL && (*(int *) right(p)) == 0)
return(0); /* empty CCL */
return(1);
case PLUS:
if (first(left(p)) == 0)
return(0);
return(1);
case STAR:
case QUEST:
first(left(p));
return(0);
case CAT:
if (first(left(p)) == 0 && first(right(p)) == 0) return(0);
return(1);
case OR:
b = first(right(p));
if (first(left(p)) == 0 || b == 0) return(0);
return(1);
case ZERO:
return 0;
}
FATAL("can't happen: unknown type %d in first", type(p)); /* can't happen */
return(-1);
}
void follow(Node *v) /* collects leaves that can follow v into setvec */
{
Node *p;
if (type(v) == FINAL)
return;
p = parent(v);
switch (type(p)) {
case STAR:
case PLUS:
first(v);
follow(p);
return;
case OR:
case QUEST:
follow(p);
return;
case CAT:
if (v == left(p)) { /* v is left child of p */
if (first(right(p)) == 0) {
follow(p);
return;
}
} else /* v is right child */
follow(p);
return;
}
}
int member(int c, int *sarg) /* is c in s? */
{
int *s = (int *) sarg;
while (*s)
if (c == *s++)
return(1);
return(0);
}
static void resize_gototab(fa *f, int state)
{
size_t new_size = f->gototab[state].allocated * 2;
gtte *p = (gtte *) realloc(f->gototab[state].entries, new_size * sizeof(gtte));
if (p == NULL)
overflo(__func__);
// need to initialized the new memory to zero
size_t orig_size = f->gototab[state].allocated; // 2nd half of new mem is this size
memset(p + orig_size, 0, orig_size * sizeof(gtte)); // clean it out
f->gototab[state].allocated = new_size; // update gototab info
f->gototab[state].entries = p;
}
static int get_gototab(fa *f, int state, int ch) /* hide gototab implementation */
{
gtte key;
gtte *item;
key.ch = ch;
key.state = 0; /* irrelevant */
item = (gtte *) bsearch(& key, f->gototab[state].entries,
f->gototab[state].inuse, sizeof(gtte),
entry_cmp);
if (item == NULL)
return 0;
else
return item->state;
}
static int entry_cmp(const void *l, const void *r)
{
const gtte *left, *right;
left = (const gtte *) l;
right = (const gtte *) r;
return left->ch - right->ch;
}
static int set_gototab(fa *f, int state, int ch, int val) /* hide gototab implementation */
{
if (f->gototab[state].inuse == 0) {
f->gototab[state].entries[0].ch = ch;
f->gototab[state].entries[0].state = val;
f->gototab[state].inuse++;
return val;
} else if (ch > f->gototab[state].entries[f->gototab[state].inuse-1].ch) {
// not seen yet, insert and return
gtt *tab = & f->gototab[state];
if (tab->inuse + 1 >= tab->allocated)
resize_gototab(f, state);
f->gototab[state].entries[f->gototab[state].inuse-1].ch = ch;
f->gototab[state].entries[f->gototab[state].inuse-1].state = val;
f->gototab[state].inuse++;
return val;
} else {
// maybe we have it, maybe we don't
gtte key;
gtte *item;
key.ch = ch;
key.state = 0; /* irrelevant */
item = (gtte *) bsearch(& key, f->gototab[state].entries,
f->gototab[state].inuse, sizeof(gtte),
entry_cmp);
if (item != NULL) {
// we have it, update state and return
item->state = val;
return item->state;
}
// otherwise, fall through to insert and reallocate.
}
gtt *tab = & f->gototab[state];
if (tab->inuse + 1 >= tab->allocated)
resize_gototab(f, state);
++tab->inuse;
f->gototab[state].entries[tab->inuse].ch = ch;
f->gototab[state].entries[tab->inuse].state = val;
qsort(f->gototab[state].entries,
f->gototab[state].inuse, sizeof(gtte), entry_cmp);
return val; /* not used anywhere at the moment */
}
static void clear_gototab(fa *f, int state)
{
memset(f->gototab[state].entries, 0,
f->gototab[state].allocated * sizeof(gtte));
f->gototab[state].inuse = 0;
}
int match(fa *f, const char *p0) /* shortest match ? */
{
int s, ns;
int n;
int rune;
const uschar *p = (const uschar *) p0;
/* return pmatch(f, p0); does it matter whether longest or shortest? */
s = f->initstat;
assert (s < f->state_count);
if (f->out[s])
return(1);
do {
/* assert(*p < NCHARS); */
n = u8_rune(&rune, (const char *) p);
if ((ns = get_gototab(f, s, rune)) != 0)
s = ns;
else
s = cgoto(f, s, rune);
if (f->out[s])
return(1);
if (*p == 0)
break;
p += n;
} while (1); /* was *p++ != 0 */
return(0);
}
int pmatch(fa *f, const char *p0) /* longest match, for sub */
{
int s, ns;
int n;
int rune;
const uschar *p = (const uschar *) p0;
const uschar *q;
s = f->initstat;
assert(s < f->state_count);
patbeg = (const char *)p;
patlen = -1;
do {
q = p;
do {
if (f->out[s]) /* final state */
patlen = q-p;
/* assert(*q < NCHARS); */
n = u8_rune(&rune, (const char *) q);
if ((ns = get_gototab(f, s, rune)) != 0)
s = ns;
else
s = cgoto(f, s, rune);
assert(s < f->state_count);
if (s == 1) { /* no transition */
if (patlen >= 0) {
patbeg = (const char *) p;
return(1);
}
else
goto nextin; /* no match */
}
if (*q == 0)
break;
q += n;
} while (1);
q++; /* was *q++ */
if (f->out[s])
patlen = q-p-1; /* don't count $ */
if (patlen >= 0) {
patbeg = (const char *) p;
return(1);
}
nextin:
s = 2;
if (*p == 0)
break;
n = u8_rune(&rune, (const char *) p);
p += n;
} while (1); /* was *p++ */
return (0);
}
int nematch(fa *f, const char *p0) /* non-empty match, for sub */
{
int s, ns;
int n;
int rune;
const uschar *p = (const uschar *) p0;
const uschar *q;
s = f->initstat;
assert(s < f->state_count);
patbeg = (const char *)p;
patlen = -1;
while (*p) {
q = p;
do {
if (f->out[s]) /* final state */
patlen = q-p;
/* assert(*q < NCHARS); */
n = u8_rune(&rune, (const char *) q);
if ((ns = get_gototab(f, s, rune)) != 0)
s = ns;
else
s = cgoto(f, s, rune);
if (s == 1) { /* no transition */
if (patlen > 0) {
patbeg = (const char *) p;
return(1);
} else
goto nnextin; /* no nonempty match */
}
if (*q == 0)
break;
q += n;
} while (1);
q++;
if (f->out[s])
patlen = q-p-1; /* don't count $ */
if (patlen > 0 ) {
patbeg = (const char *) p;
return(1);
}
nnextin:
s = 2;
p++;
}
return (0);
}
#define MAX_UTF_BYTES 4 // UTF-8 is up to 4 bytes long
/*
* NAME
* fnematch
*
* DESCRIPTION
* A stream-fed version of nematch which transfers characters to a
* null-terminated buffer. All characters up to and including the last
* character of the matching text or EOF are placed in the buffer. If
* a match is found, patbeg and patlen are set appropriately.
*
* RETURN VALUES
* false No match found.
* true Match found.
*/
bool fnematch(fa *pfa, FILE *f, char **pbuf, int *pbufsize, int quantum)
{
char *i, *j, *k, *buf = *pbuf;
int bufsize = *pbufsize;
int c, n, ns, s;
s = pfa->initstat;
patlen = 0;
/*
* buf <= i <= j <= k <= buf+bufsize
*
* i: origin of active substring
* j: current character
* k: destination of the next getc
*/
i = j = k = buf;
do {
/*
* Call u8_rune with at least MAX_UTF_BYTES ahead in
* the buffer until EOF interferes.
*/
if (k - j < MAX_UTF_BYTES) {
if (k + MAX_UTF_BYTES > buf + bufsize) {
adjbuf((char **) &buf, &bufsize,
bufsize + MAX_UTF_BYTES,
quantum, 0, "fnematch");
}
for (n = MAX_UTF_BYTES ; n > 0; n--) {
*k++ = (c = getc(f)) != EOF ? c : 0;
if (c == EOF) {
if (ferror(f))
FATAL("fnematch: getc error");
break;
}
}
}
j += u8_rune(&c, j);
if ((ns = get_gototab(pfa, s, c)) != 0)
s = ns;
else
s = cgoto(pfa, s, c);
if (pfa->out[s]) { /* final state */
patbeg = i;
patlen = j - i;
if (c == 0) /* don't count $ */
patlen--;
}
if (c && s != 1)
continue; /* origin i still viable, next j */
if (patlen)
break; /* best match found */
/* no match at origin i, next i and start over */
i += u8_rune(&c, i);
if (c == 0)
break; /* no match */
j = i;
s = 2;
} while (1);
/* adjbuf() may have relocated a resized buffer. Inform the world. */
*pbuf = buf;
*pbufsize = bufsize;
if (patlen) {
/*
* Under no circumstances is the last character fed to
* the automaton part of the match. It is EOF's nullbyte,
* or it sent the automaton into a state with no further
* transitions available (s==1), or both. Room for a
* terminating nullbyte is guaranteed.
*
* ungetc any chars after the end of matching text
* (except for EOF's nullbyte, if present) and null
* terminate the buffer.
*/
do
if (*--k && ungetc(*k, f) == EOF)
FATAL("unable to ungetc '%c'", *k);
while (k > patbeg + patlen);
*k = '\0';
return true;
}
else
return false;
}
Node *reparse(const char *p) /* parses regular expression pointed to by p */
{ /* uses relex() to scan regular expression */
Node *np;
DPRINTF("reparse <%s>\n", p);
lastre = prestr = (const uschar *) p; /* prestr points to string to be parsed */
rtok = relex();
/* GNU compatibility: an empty regexp matches anything */
if (rtok == '\0') {
/* FATAL("empty regular expression"); previous */
return(op2(EMPTYRE, NIL, NIL));
}
np = regexp();
if (rtok != '\0')
FATAL("syntax error in regular expression %s at %s", lastre, prestr);
return(np);
}
Node *regexp(void) /* top-level parse of reg expr */
{
return (alt(concat(primary())));
}
Node *primary(void)
{
Node *np;
int savelastatom;
switch (rtok) {
case CHAR:
lastatom = starttok;
np = op2(CHAR, NIL, itonp(rlxval));
rtok = relex();
return (unary(np));
case ALL:
rtok = relex();
return (unary(op2(ALL, NIL, NIL)));
case EMPTYRE:
rtok = relex();
return (unary(op2(EMPTYRE, NIL, NIL)));
case DOT:
lastatom = starttok;
rtok = relex();
return (unary(op2(DOT, NIL, NIL)));
case CCL:
np = op2(CCL, NIL, (Node*) cclenter((const char *) rlxstr));
lastatom = starttok;
rtok = relex();
return (unary(np));
case NCCL:
np = op2(NCCL, NIL, (Node *) cclenter((const char *) rlxstr));
lastatom = starttok;
rtok = relex();
return (unary(np));
case '^':
rtok = relex();
return (unary(op2(CHAR, NIL, itonp(HAT))));