forked from fanf2/unifdef
-
Notifications
You must be signed in to change notification settings - Fork 0
/
unifdef.c
1663 lines (1569 loc) · 45.7 KB
/
unifdef.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) 2002 - 2017 Tony Finch <[email protected]>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* unifdef - remove ifdef'ed lines
*
* This code was derived from software contributed to Berkeley by Dave Yost.
* It was rewritten to support ANSI C by Tony Finch. The original version
* of unifdef carried the 4-clause BSD copyright licence. None of its code
* remains in this version (though some of the names remain) so it now
* carries a more liberal licence.
*
* Wishlist:
* provide an option which will append the name of the
* appropriate symbol after #else's and #endif's
* provide an option which will check symbols after
* #else's and #endif's to see that they match their
* corresponding #ifdef or #ifndef
*
* These require better buffer handling, which would also make
* it possible to handle all "dodgy" directives correctly.
*/
#include "unifdef.h"
static const char copyright[] =
#include "version.h"
"@(#) $Author: Tony Finch ([email protected]) $\n"
"@(#) $URL: http://dotat.at/prog/unifdef $\n"
;
/* types of input lines: */
typedef enum {
LT_TRUEI, /* a true #if with ignore flag */
LT_FALSEI, /* a false #if with ignore flag */
LT_IF, /* an unknown #if */
LT_TRUE, /* a true #if */
LT_FALSE, /* a false #if */
LT_ELIF, /* an unknown #elif */
LT_ELTRUE, /* a true #elif */
LT_ELFALSE, /* a false #elif */
LT_ELSE, /* #else */
LT_ENDIF, /* #endif */
LT_DODGY, /* flag: directive is not on one line */
LT_DODGY_LAST = LT_DODGY + LT_ENDIF,
LT_PLAIN, /* ordinary line */
LT_EOF, /* end of file */
LT_ERROR, /* unevaluable #if */
LT_COUNT
} Linetype;
static char const * const linetype_name[] = {
"TRUEI", "FALSEI", "IF", "TRUE", "FALSE",
"ELIF", "ELTRUE", "ELFALSE", "ELSE", "ENDIF",
"DODGY TRUEI", "DODGY FALSEI",
"DODGY IF", "DODGY TRUE", "DODGY FALSE",
"DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE",
"DODGY ELSE", "DODGY ENDIF",
"PLAIN", "EOF", "ERROR"
};
#define linetype_if2elif(lt) ((Linetype)(lt - LT_IF + LT_ELIF))
#define linetype_2dodgy(lt) ((Linetype)(lt + LT_DODGY))
/* state of #if processing */
typedef enum {
IS_OUTSIDE,
IS_FALSE_PREFIX, /* false #if followed by false #elifs */
IS_TRUE_PREFIX, /* first non-false #(el)if is true */
IS_PASS_MIDDLE, /* first non-false #(el)if is unknown */
IS_FALSE_MIDDLE, /* a false #elif after a pass state */
IS_TRUE_MIDDLE, /* a true #elif after a pass state */
IS_PASS_ELSE, /* an else after a pass state */
IS_FALSE_ELSE, /* an else after a true state */
IS_TRUE_ELSE, /* an else after only false states */
IS_FALSE_TRAILER, /* #elifs after a true are false */
IS_COUNT
} Ifstate;
static char const * const ifstate_name[] = {
"OUTSIDE", "FALSE_PREFIX", "TRUE_PREFIX",
"PASS_MIDDLE", "FALSE_MIDDLE", "TRUE_MIDDLE",
"PASS_ELSE", "FALSE_ELSE", "TRUE_ELSE",
"FALSE_TRAILER"
};
/* state of comment parser */
typedef enum {
NO_COMMENT = false, /* outside a comment */
C_COMMENT, /* in a comment like this one */
CXX_COMMENT, /* between // and end of line */
STARTING_COMMENT, /* just after slash-backslash-newline */
FINISHING_COMMENT, /* star-backslash-newline in a C comment */
CHAR_LITERAL, /* inside '' */
STRING_LITERAL /* inside "" */
} Comment_state;
static char const * const comment_name[] = {
"NO", "C", "CXX", "STARTING", "FINISHING", "CHAR", "STRING"
};
/* state of preprocessor line parser */
typedef enum {
LS_START, /* only space and comments on this line */
LS_HASH, /* only space, comments, and a hash */
LS_DIRTY /* this line can't be a preprocessor line */
} Line_state;
static char const * const linestate_name[] = {
"START", "HASH", "DIRTY"
};
/*
* Minimum translation limits from ISO/IEC 9899:1999 5.2.4.1
*/
#define MAXDEPTH 64 /* maximum #if nesting */
#define MAXLINE 4096 /* maximum length of line */
#define MAXSYMS 16384 /* maximum number of symbols */
/*
* Sometimes when editing a keyword the replacement text is longer, so
* we leave some space at the end of the tline buffer to accommodate this.
*/
#define EDITSLOP 10
/*
* Globals.
*/
static bool compblank; /* -B: compress blank lines */
static bool lnblank; /* -b: blank deleted lines */
static bool complement; /* -c: do the complement */
static bool debugging; /* -d: debugging reports */
static bool inplace; /* -m: modify in place */
static bool iocccok; /* -e: fewer IOCCC errors */
static bool strictlogic; /* -K: keep ambiguous #ifs */
static bool killconsts; /* -k: eval constant #ifs */
static bool lnnum; /* -n: add #line directives */
static bool symlist; /* -s: output symbol list */
static bool symdepth; /* -S: output symbol depth */
static bool text; /* -t: this is a text file */
static const char *symname[MAXSYMS]; /* symbol name */
static const char *value[MAXSYMS]; /* -Dsym=value */
static bool ignore[MAXSYMS]; /* -iDsym or -iUsym */
static int nsyms; /* number of symbols */
static FILE *input; /* input file pointer */
static const char *filename; /* input file name */
static int linenum; /* current line number */
static const char *linefile; /* file name for #line */
static FILE *output; /* output file pointer */
static const char *ofilename; /* output file name */
static const char *backext; /* backup extension */
static char *tempname; /* avoid splatting input */
static char tline[MAXLINE+EDITSLOP];/* input buffer plus space */
static char *keyword; /* used for editing #elif's */
/*
* When processing a file, the output's newline style will match the
* input's, and unifdef correctly handles CRLF or LF endings whatever
* the platform's native style. The stdio streams are opened in binary
* mode to accommodate platforms whose native newline style is CRLF.
* When the output isn't a processed input file (when it is error /
* debug / diagnostic messages) then unifdef uses native line endings.
*/
static const char *newline; /* input file format */
static const char newline_unix[] = "\n";
static const char newline_crlf[] = "\r\n";
static Comment_state incomment; /* comment parser state */
static Line_state linestate; /* #if line parser state */
static Ifstate ifstate[MAXDEPTH]; /* #if processor state */
static bool ignoring[MAXDEPTH]; /* ignore comments state */
static int stifline[MAXDEPTH]; /* start of current #if */
static int depth; /* current #if nesting */
static int delcount; /* count of deleted lines */
static unsigned blankcount; /* count of blank lines */
static unsigned blankmax; /* maximum recent blankcount */
static bool constexpr; /* constant #if expression */
static bool zerosyms; /* to format symdepth output */
static bool firstsym; /* ditto */
static int exitmode; /* exit status mode */
static int exitstat; /* program exit status */
static bool altered; /* was this file modified? */
static void addsym1(bool, bool, char *);
static void addsym2(bool, const char *, const char *);
static char *astrcat(const char *, const char *);
static void cleantemp(void);
static void closeio(void);
static void debug(const char *, ...);
static void debugsym(const char *, int);
static bool defundef(void);
static void defundefile(const char *);
static void done(void);
static void error(const char *);
static int findsym(const char **);
static void flushline(bool);
static void hashline(void);
static void help(void);
static Linetype ifeval(const char **);
static void ignoreoff(void);
static void ignoreon(void);
static void indirectsym(void);
static void keywordedit(const char *);
static const char *matchsym(const char *, const char *);
static void nest(void);
static Linetype parseline(void);
static void process(void);
static void processinout(const char *, const char *);
static const char *skipargs(const char *);
static const char *skipcomment(const char *);
static const char *skiphash(void);
static const char *skipline(const char *);
static const char *skipsym(const char *);
static void state(Ifstate);
static void unnest(void);
static void usage(void);
static void version(void);
static const char *xstrdup(const char *, const char *);
#define endsym(c) (!isalnum((unsigned char)c) && c != '_')
/*
* The main program.
*/
int
main(int argc, char *argv[])
{
int opt;
while ((opt = getopt(argc, argv, "i:D:U:f:I:M:o:x:bBcdehKklmnsStV")) != -1)
switch (opt) {
case 'i': /* treat stuff controlled by these symbols as text */
/*
* For strict backwards-compatibility the U or D
* should be immediately after the -i but it doesn't
* matter much if we relax that requirement.
*/
opt = *optarg++;
if (opt == 'D')
addsym1(true, true, optarg);
else if (opt == 'U')
addsym1(true, false, optarg);
else
usage();
break;
case 'D': /* define a symbol */
addsym1(false, true, optarg);
break;
case 'U': /* undef a symbol */
addsym1(false, false, optarg);
break;
case 'I': /* no-op for compatibility with cpp */
break;
case 'b': /* blank deleted lines instead of omitting them */
case 'l': /* backwards compatibility */
lnblank = true;
break;
case 'B': /* compress blank lines around removed section */
compblank = true;
break;
case 'c': /* treat -D as -U and vice versa */
complement = true;
break;
case 'd':
debugging = true;
break;
case 'e': /* fewer errors from dodgy lines */
iocccok = true;
break;
case 'f': /* definitions file */
defundefile(optarg);
break;
case 'h':
help();
break;
case 'K': /* keep ambiguous #ifs */
strictlogic = true;
break;
case 'k': /* process constant #ifs */
killconsts = true;
break;
case 'm': /* modify in place */
inplace = true;
break;
case 'M': /* modify in place and keep backup */
inplace = true;
if (strlen(optarg) > 0)
backext = optarg;
break;
case 'n': /* add #line directive after deleted lines */
lnnum = true;
break;
case 'o': /* output to a file */
ofilename = optarg;
break;
case 's': /* only output list of symbols that control #ifs */
symlist = true;
break;
case 'S': /* list symbols with their nesting depth */
symlist = symdepth = true;
break;
case 't': /* don't parse C comments */
text = true;
break;
case 'V':
version();
break;
case 'x':
exitmode = atoi(optarg);
if(exitmode < 0 || exitmode > 2)
usage();
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (compblank && lnblank)
errx(2, "-B and -b are mutually exclusive");
if (symlist && (ofilename != NULL || inplace || argc > 1))
errx(2, "-s only works with one input file");
if (argc > 1 && ofilename != NULL)
errx(2, "-o cannot be used with multiple input files");
if (argc > 1 && !inplace)
errx(2, "multiple input files require -m or -M");
if (argc == 0 && inplace)
errx(2, "-m requires an input file");
if (argc == 0)
argc = 1;
if (argc == 1 && !inplace && ofilename == NULL)
ofilename = "-";
indirectsym();
atexit(cleantemp);
if (ofilename != NULL)
processinout(*argv, ofilename);
else while (argc-- > 0) {
processinout(*argv, *argv);
argv++;
}
switch(exitmode) {
case(0): exit(exitstat);
case(1): exit(!exitstat);
case(2): exit(0);
default: abort(); /* bug */
}
}
/*
* File logistics.
*/
static void
processinout(const char *ifn, const char *ofn)
{
struct stat st;
if (ifn == NULL || strcmp(ifn, "-") == 0) {
filename = "[stdin]";
linefile = NULL;
input = fbinmode(stdin);
} else {
filename = ifn;
linefile = ifn;
input = fopen(ifn, "rb");
if (input == NULL)
err(2, "can't open %s", ifn);
}
if (strcmp(ofn, "-") == 0) {
output = fbinmode(stdout);
process();
return;
}
if (stat(ofn, &st) < 0) {
output = fopen(ofn, "wb");
if (output == NULL)
err(2, "can't create %s", ofn);
process();
return;
}
tempname = astrcat(ofn, ".XXXXXX");
output = mktempmode(tempname, st.st_mode);
if (output == NULL)
err(2, "can't create %s", tempname);
process();
if (backext != NULL) {
char *backname = astrcat(ofn, backext);
if (rename(ofn, backname) < 0)
err(2, "can't rename \"%s\" to \"%s\"", ofn, backname);
free(backname);
}
/* leave file unmodified if unifdef made no changes */
if (!altered && backext == NULL) {
if (remove(tempname) < 0)
warn("can't remove \"%s\"", tempname);
} else if (replace(tempname, ofn) < 0)
err(2, "can't rename \"%s\" to \"%s\"", tempname, ofn);
free(tempname);
tempname = NULL;
}
/*
* For cleaning up if there is an error.
*/
static void
cleantemp(void)
{
if (tempname != NULL)
remove(tempname);
}
/*
* Self-identification functions.
*/
static void
version(void)
{
const char *c = copyright;
for (;;) {
while (*++c != '$')
if (*c == '\0')
exit(0);
while (*++c != '$')
putc(*c, stderr);
putc('\n', stderr);
}
}
static void
synopsis(FILE *fp)
{
fprintf(fp,
"usage: unifdef [-bBcdehKkmnsStV] [-x{012}] [-Mext] [-opath] \\\n"
" [-[i]Dsym[=val]] [-[i]Usym] [-fpath] ... [file] ...\n");
}
static void
usage(void)
{
synopsis(stderr);
exit(2);
}
static void
help(void)
{
synopsis(stdout);
printf(
" -Dsym=val define preprocessor symbol with given value\n"
" -Dsym define preprocessor symbol with value 1\n"
" -Usym preprocessor symbol is undefined\n"
" -iDsym=val \\ ignore C strings and comments\n"
" -iDsym ) in sections controlled by these\n"
" -iUsym / preprocessor symbols\n"
" -fpath file containing #define and #undef directives\n"
" -b blank lines instead of deleting them\n"
" -B compress blank lines around deleted section\n"
" -c complement (invert) keep vs. delete\n"
" -d debugging mode\n"
" -e ignore multiline preprocessor directives\n"
" -h print help\n"
" -Ipath extra include file path (ignored)\n"
" -K disable && and || short-circuiting\n"
" -k process constant #if expressions\n"
" -Mext modify in place and keep backups\n"
" -m modify input files in place\n"
" -n add #line directives to output\n"
" -opath output file name\n"
" -S list #if control symbols with nesting\n"
" -s list #if control symbols\n"
" -t ignore C strings and comments\n"
" -V print version\n"
" -x{012} exit status mode\n"
);
exit(0);
}
/*
* A state transition function alters the global #if processing state
* in a particular way. The table below is indexed by the current
* processing state and the type of the current line.
*
* Nesting is handled by keeping a stack of states; some transition
* functions increase or decrease the depth. They also maintain the
* ignore state on a stack. In some complicated cases they have to
* alter the preprocessor directive, as follows.
*
* When we have processed a group that starts off with a known-false
* #if/#elif sequence (which has therefore been deleted) followed by a
* #elif that we don't understand and therefore must keep, we edit the
* latter into a #if to keep the nesting correct. We use memcpy() to
* overwrite the 4 byte token "elif" with "if " without a '\0' byte.
*
* When we find a true #elif in a group, the following block will
* always be kept and the rest of the sequence after the next #elif or
* #else will be discarded. We edit the #elif into a #else and the
* following directive to #endif since this has the desired behaviour.
*
* "Dodgy" directives are split across multiple lines, the most common
* example being a multi-line comment hanging off the right of the
* directive. We can handle them correctly only if there is no change
* from printing to dropping (or vice versa) caused by that directive.
* If the directive is the first of a group we have a choice between
* failing with an error, or passing it through unchanged instead of
* evaluating it. The latter is not the default to avoid questions from
* users about unifdef unexpectedly leaving behind preprocessor directives.
*/
typedef void state_fn(void);
/* report an error */
static void Eelif (void) { error("Inappropriate #elif"); }
static void Eelse (void) { error("Inappropriate #else"); }
static void Eendif(void) { error("Inappropriate #endif"); }
static void Eeof (void) { error("Premature EOF"); }
static void Eioccc(void) { error("Obfuscated preprocessor control line"); }
/* plain line handling */
static void print (void) { flushline(true); }
static void drop (void) { flushline(false); }
/* output lacks group's start line */
static void Strue (void) { drop(); ignoreoff(); state(IS_TRUE_PREFIX); }
static void Sfalse(void) { drop(); ignoreoff(); state(IS_FALSE_PREFIX); }
static void Selse (void) { drop(); state(IS_TRUE_ELSE); }
/* print/pass this block */
static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); }
static void Pelse (void) { print(); state(IS_PASS_ELSE); }
static void Pendif(void) { print(); unnest(); }
/* discard this block */
static void Dfalse(void) { drop(); ignoreoff(); state(IS_FALSE_TRAILER); }
static void Delif (void) { drop(); ignoreoff(); state(IS_FALSE_MIDDLE); }
static void Delse (void) { drop(); state(IS_FALSE_ELSE); }
static void Dendif(void) { drop(); unnest(); }
/* first line of group */
static void Fdrop (void) { nest(); Dfalse(); }
static void Fpass (void) { nest(); Pelif(); }
static void Ftrue (void) { nest(); Strue(); }
static void Ffalse(void) { nest(); Sfalse(); }
/* variable pedantry for obfuscated lines */
static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); }
static void Oif (void) { if (!iocccok) Eioccc(); Fpass(); }
static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }
/* ignore comments in this block */
static void Idrop (void) { Fdrop(); ignoreon(); }
static void Itrue (void) { Ftrue(); ignoreon(); }
static void Ifalse(void) { Ffalse(); ignoreon(); }
/* modify this line */
static void Mpass (void) { memcpy(keyword, "if ", 4); Pelif(); }
static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); }
static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }
static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
/* IS_OUTSIDE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif,
print, done, abort },
/* IS_FALSE_PREFIX */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc,
drop, Eeof, abort },
/* IS_TRUE_PREFIX */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
print, Eeof, abort },
/* IS_PASS_MIDDLE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif,
print, Eeof, abort },
/* IS_FALSE_MIDDLE */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
drop, Eeof, abort },
/* IS_TRUE_MIDDLE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif,
print, Eeof, abort },
/* IS_PASS_ELSE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif,
print, Eeof, abort },
/* IS_FALSE_ELSE */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc,
drop, Eeof, abort },
/* IS_TRUE_ELSE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc,
print, Eeof, abort },
/* IS_FALSE_TRAILER */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc,
drop, Eeof, abort }
/*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF
TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY)
PLAIN EOF ERROR */
};
/*
* State machine utility functions
*/
static void
ignoreoff(void)
{
if (depth == 0)
abort(); /* bug */
ignoring[depth] = ignoring[depth-1];
}
static void
ignoreon(void)
{
ignoring[depth] = true;
}
static void
keywordedit(const char *replacement)
{
snprintf(keyword, tline + sizeof(tline) - keyword,
"%s%s", replacement, newline);
altered = true;
print();
}
static void
nest(void)
{
if (depth > MAXDEPTH-1)
abort(); /* bug */
if (depth == MAXDEPTH-1)
error("Too many levels of nesting");
depth += 1;
stifline[depth] = linenum;
}
static void
unnest(void)
{
if (depth == 0)
abort(); /* bug */
depth -= 1;
}
static void
state(Ifstate is)
{
ifstate[depth] = is;
}
/*
* The last state transition function. When this is called,
* lineval == LT_EOF, so the process() loop will terminate.
*/
static void
done(void)
{
if (incomment)
error("EOF in comment");
closeio();
}
/*
* Write a line to the output or not, according to command line options.
* If writing fails, closeio() will print the error and exit.
*/
static void
flushline(bool keep)
{
if (symlist)
return;
if (keep ^ complement) {
bool blankline = tline[strspn(tline, " \t\r\n")] == '\0';
if (blankline && compblank && blankcount != blankmax) {
delcount += 1;
blankcount += 1;
} else {
if (lnnum && delcount > 0)
hashline();
if (fputs(tline, output) == EOF)
closeio();
delcount = 0;
blankmax = blankcount = blankline ? blankcount + 1 : 0;
}
} else {
if (lnblank && fputs(newline, output) == EOF)
closeio();
altered = true;
delcount += 1;
blankcount = 0;
}
if (debugging && fflush(output) == EOF)
closeio();
}
/*
* Format of #line directives depends on whether we know the input filename.
*/
static void
hashline(void)
{
int e;
if (linefile == NULL)
e = fprintf(output, "#line %d%s", linenum, newline);
else
e = fprintf(output, "#line %d \"%s\"%s",
linenum, linefile, newline);
if (e < 0)
closeio();
}
/*
* Flush the output and handle errors.
*/
static void
closeio(void)
{
/* Tidy up after findsym(). */
if (symdepth && !zerosyms)
printf("\n");
if (output != NULL && (ferror(output) || fclose(output) == EOF))
err(2, "%s: can't write to output", filename);
fclose(input);
}
/*
* The driver for the state machine.
*/
static void
process(void)
{
Linetype lineval = LT_PLAIN;
/* When compressing blank lines, act as if the file
is preceded by a large number of blank lines. */
blankmax = blankcount = 1000;
zerosyms = true;
newline = NULL;
linenum = 0;
altered = false;
while (lineval != LT_EOF) {
lineval = parseline();
trans_table[ifstate[depth]][lineval]();
debug("process line %d %s -> %s depth %d",
linenum, linetype_name[lineval],
ifstate_name[ifstate[depth]], depth);
}
exitstat |= altered;
}
/*
* Parse a line and determine its type. We keep the preprocessor line
* parser state between calls in the global variable linestate, with
* help from skipcomment().
*/
static Linetype
parseline(void)
{
const char *cp;
int cursym;
Linetype retval;
Comment_state wascomment;
wascomment = incomment;
cp = skiphash();
if (cp == NULL)
return (LT_EOF);
if (newline == NULL) {
if (strrchr(tline, '\n') == strrchr(tline, '\r') + 1)
newline = newline_crlf;
else
newline = newline_unix;
}
if (*cp == '\0') {
retval = LT_PLAIN;
goto done;
}
keyword = tline + (cp - tline);
if ((cp = matchsym("ifdef", keyword)) != NULL ||
(cp = matchsym("ifndef", keyword)) != NULL) {
cp = skipcomment(cp);
if ((cursym = findsym(&cp)) < 0)
retval = LT_IF;
else {
retval = (keyword[2] == 'n')
? LT_FALSE : LT_TRUE;
if (value[cursym] == NULL)
retval = (retval == LT_TRUE)
? LT_FALSE : LT_TRUE;
if (ignore[cursym])
retval = (retval == LT_TRUE)
? LT_TRUEI : LT_FALSEI;
}
} else if ((cp = matchsym("if", keyword)) != NULL)
retval = ifeval(&cp);
else if ((cp = matchsym("elif", keyword)) != NULL)
retval = linetype_if2elif(ifeval(&cp));
else if ((cp = matchsym("else", keyword)) != NULL)
retval = LT_ELSE;
else if ((cp = matchsym("endif", keyword)) != NULL)
retval = LT_ENDIF;
else {
cp = skipsym(keyword);
/* no way can we deal with a continuation inside a keyword */
if (strncmp(cp, "\\\r\n", 3) == 0 ||
strncmp(cp, "\\\n", 2) == 0)
Eioccc();
cp = skipline(cp);
retval = LT_PLAIN;
goto done;
}
cp = skipcomment(cp);
if (*cp != '\0') {
cp = skipline(cp);
if (retval == LT_TRUE || retval == LT_FALSE ||
retval == LT_TRUEI || retval == LT_FALSEI)
retval = LT_IF;
if (retval == LT_ELTRUE || retval == LT_ELFALSE)
retval = LT_ELIF;
}
/* the following can happen if the last line of the file lacks a
newline or if there is too much whitespace in a directive */
if (linestate == LS_HASH) {
long len = cp - tline;
if (fgets(tline + len, MAXLINE - len, input) == NULL) {
if (ferror(input))
err(2, "can't read %s", filename);
debug("parser insert newline at EOF", linenum);
strcpy(tline + len, newline);
cp += strlen(newline);
linestate = LS_START;
} else {
debug("parser concatenate dangling whitespace");
++linenum;
cp = skipcomment(cp);
}
}
if (retval != LT_PLAIN && (wascomment || linestate != LS_START)) {
retval = linetype_2dodgy(retval);
linestate = LS_DIRTY;
}
done:
debug("parser line %d state %s comment %s line", linenum,
comment_name[incomment], linestate_name[linestate]);
return (retval);
}
/*
* These are the binary operators that are supported by the expression
* evaluator.
*/
static Linetype op_strict(long *p, long v, Linetype at, Linetype bt) {
if(at == LT_IF || bt == LT_IF) return (LT_IF);
return (*p = v, v ? LT_TRUE : LT_FALSE);
}
static Linetype op_lt(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a < b, at, bt);
}
static Linetype op_gt(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a > b, at, bt);
}
static Linetype op_le(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a <= b, at, bt);
}
static Linetype op_ge(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a >= b, at, bt);
}
static Linetype op_eq(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a == b, at, bt);
}
static Linetype op_ne(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a != b, at, bt);
}
static Linetype op_or(long *p, Linetype at, long a, Linetype bt, long b) {
if (!strictlogic && (at == LT_TRUE || bt == LT_TRUE))
return (*p = 1, LT_TRUE);
return op_strict(p, a || b, at, bt);
}
static Linetype op_and(long *p, Linetype at, long a, Linetype bt, long b) {
if (!strictlogic && (at == LT_FALSE || bt == LT_FALSE))
return (*p = 0, LT_FALSE);
return op_strict(p, a && b, at, bt);
}
static Linetype op_blsh(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a << b, at, bt);
}
static Linetype op_brsh(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a >> b, at, bt);
}
static Linetype op_add(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a + b, at, bt);
}
static Linetype op_sub(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a - b, at, bt);
}
static Linetype op_mul(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a * b, at, bt);
}
static Linetype op_div(long *p, Linetype at, long a, Linetype bt, long b) {
if (bt != LT_TRUE) {
debug("eval division by zero");
return (LT_ERROR);
}
return op_strict(p, a / b, at, bt);
}
static Linetype op_mod(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a % b, at, bt);
}
static Linetype op_bor(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a | b, at, bt);
}
static Linetype op_bxor(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a ^ b, at, bt);
}
static Linetype op_band(long *p, Linetype at, long a, Linetype bt, long b) {
return op_strict(p, a & b, at, bt);
}
/*
* An evaluation function takes three arguments, as follows: (1) a pointer to
* an element of the precedence table which lists the operators at the current
* level of precedence; (2) a pointer to an integer which will receive the
* value of the expression; and (3) a pointer to a char* that points to the
* expression to be evaluated and that is updated to the end of the expression
* when evaluation is complete. The function returns LT_FALSE if the value of
* the expression is zero, LT_TRUE if it is non-zero, LT_IF if the expression
* depends on an unknown symbol, or LT_ERROR if there is a parse failure.
*/
struct ops;
typedef Linetype eval_fn(const struct ops *, long *, const char **);
static eval_fn eval_table, eval_unary;
/*
* The precedence table. Expressions involving binary operators are evaluated
* in a table-driven way by eval_table. When it evaluates a subexpression it
* calls the inner function with its first argument pointing to the next
* element of the table. Innermost expressions have special non-table-driven
* handling.
*
* The stop characters help with lexical analysis: an operator is not
* recognized if it is followed by one of the stop characters because
* that would make it a different operator.
*/
struct op {
const char *str;
Linetype (*fn)(long *, Linetype, long, Linetype, long);
const char *stop;
};
struct ops {
eval_fn *inner;
struct op op[5];
};
static const struct ops eval_ops[] = {
{ eval_table, { { "||", op_or, NULL } } },
{ eval_table, { { "&&", op_and, NULL } } },
{ eval_table, { { "|", op_bor, "|" } } },
{ eval_table, { { "^", op_bxor, NULL } } },
{ eval_table, { { "&", op_band, "&" } } },
{ eval_table, { { "==", op_eq, NULL },
{ "!=", op_ne, NULL } } },
{ eval_table, { { "<=", op_le, NULL },
{ ">=", op_ge, NULL },
{ "<", op_lt, "<=" },
{ ">", op_gt, ">=" } } },
{ eval_table, { { "<<", op_blsh, NULL },
{ ">>", op_brsh, NULL } } },
{ eval_table, { { "+", op_add, NULL },
{ "-", op_sub, NULL } } },
{ eval_unary, { { "*", op_mul, NULL },
{ "/", op_div, NULL },
{ "%", op_mod, NULL } } },
};
/* Current operator precedence level */
static long prec(const struct ops *ops)