2
* Copyright (c) 2002 - 2005 Tony Finch <dot@dotat.at>. All rights reserved.
4
* This code is derived from software contributed to Berkeley by Dave Yost.
5
* It was rewritten to support ANSI C by Tony Finch. The original version of
6
* unifdef carried the following copyright notice. None of its code remains
7
* in this version (though some of the names remain).
9
* Copyright (c) 1985, 1993
10
* The Regents of the University of California. All rights reserved.
12
* Redistribution and use in source and binary forms, with or without
13
* modification, are permitted provided that the following conditions
15
* 1. Redistributions of source code must retain the above copyright
16
* notice, this list of conditions and the following disclaimer.
17
* 2. Redistributions in binary form must reproduce the above copyright
18
* notice, this list of conditions and the following disclaimer in the
19
* documentation and/or other materials provided with the distribution.
21
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34
#include <sys/cdefs.h>
38
static const char copyright[] =
39
"@(#) Copyright (c) 1985, 1993\n\
40
The Regents of the University of California. All rights reserved.\n";
43
__IDSTRING(Berkeley, "@(#)unifdef.c 8.1 (Berkeley) 6/6/93");
44
__IDSTRING(NetBSD, "$NetBSD: unifdef.c,v 1.8 2000/07/03 02:51:36 matt Exp $");
45
__IDSTRING(dotat, "$dotat: things/unifdef.c,v 1.171 2005/03/08 12:38:48 fanf2 Exp $");
49
__FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/unifdef/unifdef.c,v 1.20 2005/05/21 09:55:09 ru Exp $");
53
* unifdef - remove ifdef'ed lines
56
* provide an option which will append the name of the
57
* appropriate symbol after #else's and #endif's
58
* provide an option which will check symbols after
59
* #else's and #endif's to see that they match their
60
* corresponding #ifdef or #ifndef
62
* The first two items above require better buffer handling, which would
63
* also make it possible to handle all "dodgy" directives correctly.
75
size_t strlcpy(char *dst, const char *src, size_t siz);
77
/* types of input lines: */
79
LT_TRUEI, /* a true #if with ignore flag */
80
LT_FALSEI, /* a false #if with ignore flag */
81
LT_IF, /* an unknown #if */
82
LT_TRUE, /* a true #if */
83
LT_FALSE, /* a false #if */
84
LT_ELIF, /* an unknown #elif */
85
LT_ELTRUE, /* a true #elif */
86
LT_ELFALSE, /* a false #elif */
88
LT_ENDIF, /* #endif */
89
LT_DODGY, /* flag: directive is not on one line */
90
LT_DODGY_LAST = LT_DODGY + LT_ENDIF,
91
LT_PLAIN, /* ordinary line */
92
LT_EOF, /* end of file */
96
static char const * const linetype_name[] = {
97
"TRUEI", "FALSEI", "IF", "TRUE", "FALSE",
98
"ELIF", "ELTRUE", "ELFALSE", "ELSE", "ENDIF",
99
"DODGY TRUEI", "DODGY FALSEI",
100
"DODGY IF", "DODGY TRUE", "DODGY FALSE",
101
"DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE",
102
"DODGY ELSE", "DODGY ENDIF",
106
/* state of #if processing */
109
IS_FALSE_PREFIX, /* false #if followed by false #elifs */
110
IS_TRUE_PREFIX, /* first non-false #(el)if is true */
111
IS_PASS_MIDDLE, /* first non-false #(el)if is unknown */
112
IS_FALSE_MIDDLE, /* a false #elif after a pass state */
113
IS_TRUE_MIDDLE, /* a true #elif after a pass state */
114
IS_PASS_ELSE, /* an else after a pass state */
115
IS_FALSE_ELSE, /* an else after a true state */
116
IS_TRUE_ELSE, /* an else after only false states */
117
IS_FALSE_TRAILER, /* #elifs after a true are false */
121
static char const * const ifstate_name[] = {
122
"OUTSIDE", "FALSE_PREFIX", "TRUE_PREFIX",
123
"PASS_MIDDLE", "FALSE_MIDDLE", "TRUE_MIDDLE",
124
"PASS_ELSE", "FALSE_ELSE", "TRUE_ELSE",
128
/* state of comment parser */
130
NO_COMMENT = false, /* outside a comment */
131
C_COMMENT, /* in a comment like this one */
132
CXX_COMMENT, /* between // and end of line */
133
STARTING_COMMENT, /* just after slash-backslash-newline */
134
FINISHING_COMMENT, /* star-backslash-newline in a C comment */
135
CHAR_LITERAL, /* inside '' */
136
STRING_LITERAL /* inside "" */
139
static char const * const comment_name[] = {
140
"NO", "C", "CXX", "STARTING", "FINISHING", "CHAR", "STRING"
143
/* state of preprocessor line parser */
145
LS_START, /* only space and comments on this line */
146
LS_HASH, /* only space, comments, and a hash */
147
LS_DIRTY /* this line can't be a preprocessor line */
150
static char const * const linestate_name[] = {
151
"START", "HASH", "DIRTY"
155
* Minimum translation limits from ISO/IEC 9899:1999 5.2.4.1
157
#define MAXDEPTH 64 /* maximum #if nesting */
158
#define MAXLINE 4096 /* maximum length of line */
159
#define MAXSYMS 4096 /* maximum number of symbols */
162
* Sometimes when editing a keyword the replacement text is longer, so
163
* we leave some space at the end of the tline buffer to accommodate this.
171
static bool complement; /* -c: do the complement */
172
static bool debugging; /* -d: debugging reports */
173
static bool iocccok; /* -e: fewer IOCCC errors */
174
static bool killconsts; /* -k: eval constant #ifs */
175
static bool lnblank; /* -l: blank deleted lines */
176
static bool lnnum; /* -n: add #line directives */
177
static bool symlist; /* -s: output symbol list */
178
static bool text; /* -t: this is a text file */
180
static const char *symname[MAXSYMS]; /* symbol name */
181
static const char *value[MAXSYMS]; /* -Dsym=value */
182
static bool ignore[MAXSYMS]; /* -iDsym or -iUsym */
183
static int nsyms; /* number of symbols */
185
static FILE *input; /* input file pointer */
186
static const char *filename; /* input file name */
187
static int linenum; /* current line number */
189
static char tline[MAXLINE+EDITSLOP];/* input buffer plus space */
190
static char *keyword; /* used for editing #elif's */
192
static Comment_state incomment; /* comment parser state */
193
static Line_state linestate; /* #if line parser state */
194
static Ifstate ifstate[MAXDEPTH]; /* #if processor state */
195
static bool ignoring[MAXDEPTH]; /* ignore comments state */
196
static int stifline[MAXDEPTH]; /* start of current #if */
197
static int depth; /* current #if nesting */
198
static int delcount; /* count of deleted lines */
199
static bool keepthis; /* don't delete constant #if */
201
static int exitstat; /* program exit status */
203
static void addsym(bool, bool, char *);
204
static void debug(const char *, ...);
205
static void done(void);
206
static void error(const char *);
207
static int findsym(const char *);
208
static void flushline(bool);
209
static Linetype getline(void);
210
static Linetype ifeval(const char **);
211
static void ignoreoff(void);
212
static void ignoreon(void);
213
static void keywordedit(const char *);
214
static void nest(void);
215
static void process(void);
216
static const char *skipcomment(const char *);
217
static const char *skipsym(const char *);
218
static void state(Ifstate);
219
static int strlcmp(const char *, const char *, size_t);
220
static void unnest(void);
221
static void usage(void);
223
#define endsym(c) (!isalpha((unsigned char)c) && !isdigit((unsigned char)c) && c != '_')
229
main(int argc, char *argv[])
233
while ((opt = getopt(argc, argv, "i:D:U:I:cdeklnst")) != -1)
235
case 'i': /* treat stuff controlled by these symbols as text */
237
* For strict backwards-compatibility the U or D
238
* should be immediately after the -i but it doesn't
239
* matter much if we relax that requirement.
243
addsym(true, true, optarg);
245
addsym(true, false, optarg);
249
case 'D': /* define a symbol */
250
addsym(false, true, optarg);
252
case 'U': /* undef a symbol */
253
addsym(false, false, optarg);
256
/* no-op for compatibility with cpp */
258
case 'c': /* treat -D as -U and vice versa */
264
case 'e': /* fewer errors from dodgy lines */
267
case 'k': /* process constant #ifs */
270
case 'l': /* blank deleted lines instead of omitting them */
273
case 'n': /* add #line directive after deleted lines */
276
case 's': /* only output list of symbols that control #ifs */
279
case 't': /* don't parse C comments */
288
errx(2, "can only do one file");
289
} else if (argc == 1 && strcmp(*argv, "-") != 0) {
291
input = fopen(filename, "r");
293
err(2, "can't open %s", filename);
295
filename = "[stdin]";
305
fprintf(stderr, "usage: unifdef [-cdeklnst] [-Ipath]"
306
" [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n");
311
* A state transition function alters the global #if processing state
312
* in a particular way. The table below is indexed by the current
313
* processing state and the type of the current line.
315
* Nesting is handled by keeping a stack of states; some transition
316
* functions increase or decrease the depth. They also maintain the
317
* ignore state on a stack. In some complicated cases they have to
318
* alter the preprocessor directive, as follows.
320
* When we have processed a group that starts off with a known-false
321
* #if/#elif sequence (which has therefore been deleted) followed by a
322
* #elif that we don't understand and therefore must keep, we edit the
323
* latter into a #if to keep the nesting correct.
325
* When we find a true #elif in a group, the following block will
326
* always be kept and the rest of the sequence after the next #elif or
327
* #else will be discarded. We edit the #elif into a #else and the
328
* following directive to #endif since this has the desired behaviour.
330
* "Dodgy" directives are split across multiple lines, the most common
331
* example being a multi-line comment hanging off the right of the
332
* directive. We can handle them correctly only if there is no change
333
* from printing to dropping (or vice versa) caused by that directive.
334
* If the directive is the first of a group we have a choice between
335
* failing with an error, or passing it through unchanged instead of
336
* evaluating it. The latter is not the default to avoid questions from
337
* users about unifdef unexpectedly leaving behind preprocessor directives.
339
typedef void state_fn(void);
341
/* report an error */
342
static void Eelif (void) { error("Inappropriate #elif"); }
343
static void Eelse (void) { error("Inappropriate #else"); }
344
static void Eendif(void) { error("Inappropriate #endif"); }
345
static void Eeof (void) { error("Premature EOF"); }
346
static void Eioccc(void) { error("Obfuscated preprocessor control line"); }
347
/* plain line handling */
348
static void print (void) { flushline(true); }
349
static void drop (void) { flushline(false); }
350
/* output lacks group's start line */
351
static void Strue (void) { drop(); ignoreoff(); state(IS_TRUE_PREFIX); }
352
static void Sfalse(void) { drop(); ignoreoff(); state(IS_FALSE_PREFIX); }
353
static void Selse (void) { drop(); state(IS_TRUE_ELSE); }
354
/* print/pass this block */
355
static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); }
356
static void Pelse (void) { print(); state(IS_PASS_ELSE); }
357
static void Pendif(void) { print(); unnest(); }
358
/* discard this block */
359
static void Dfalse(void) { drop(); ignoreoff(); state(IS_FALSE_TRAILER); }
360
static void Delif (void) { drop(); ignoreoff(); state(IS_FALSE_MIDDLE); }
361
static void Delse (void) { drop(); state(IS_FALSE_ELSE); }
362
static void Dendif(void) { drop(); unnest(); }
363
/* first line of group */
364
static void Fdrop (void) { nest(); Dfalse(); }
365
static void Fpass (void) { nest(); Pelif(); }
366
static void Ftrue (void) { nest(); Strue(); }
367
static void Ffalse(void) { nest(); Sfalse(); }
368
/* variable pedantry for obfuscated lines */
369
static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); }
370
static void Oif (void) { if (!iocccok) Eioccc(); Fpass(); }
371
static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }
372
/* ignore comments in this block */
373
static void Idrop (void) { Fdrop(); ignoreon(); }
374
static void Itrue (void) { Ftrue(); ignoreon(); }
375
static void Ifalse(void) { Ffalse(); ignoreon(); }
377
static void Mpass (void) { strncpy(keyword, "if ", 4); Pelif(); }
378
static void Mtrue (void) { keywordedit("else\n"); state(IS_TRUE_MIDDLE); }
379
static void Melif (void) { keywordedit("endif\n"); state(IS_FALSE_TRAILER); }
380
static void Melse (void) { keywordedit("endif\n"); state(IS_FALSE_ELSE); }
382
static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
384
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif,
385
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif,
387
/* IS_FALSE_PREFIX */
388
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif,
389
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc,
392
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif,
393
Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
396
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif,
397
Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif,
399
/* IS_FALSE_MIDDLE */
400
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif,
401
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
404
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif,
405
Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif,
408
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif,
409
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif,
412
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif,
413
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc,
416
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif,
417
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc,
419
/* IS_FALSE_TRAILER */
420
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif,
421
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc,
423
/*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF
424
TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY)
429
* State machine utility functions
435
error("EOF in comment");
443
ignoring[depth] = ignoring[depth-1];
448
ignoring[depth] = true;
451
keywordedit(const char *replacement)
453
size_t size = tline + sizeof(tline) - keyword;
455
const char *src = replacement;
457
while ((--size != 0) && (*src != '\0'))
467
if (depth >= MAXDEPTH)
468
error("Too many levels of nesting");
469
stifline[depth] = linenum;
485
* Write a line to the output or not, according to command line options.
492
if (keep ^ complement) {
493
if (lnnum && delcount > 0)
494
printf("#line %d\n", linenum);
495
fputs(tline, stdout);
506
* The driver for the state machine.
516
trans_table[ifstate[depth]][lineval]();
517
debug("process %s -> %s depth %d",
518
linetype_name[lineval],
519
ifstate_name[ifstate[depth]], depth);
524
* Parse a line and determine its type. We keep the preprocessor line
525
* parser state between calls in the global variable linestate, with
526
* help from skipcomment().
535
Comment_state wascomment;
537
if (fgets(tline, MAXLINE, input) == NULL)
540
wascomment = incomment;
541
cp = skipcomment(tline);
542
if (linestate == LS_START) {
545
cp = skipcomment(cp + 1);
546
} else if (*cp != '\0')
547
linestate = LS_DIRTY;
549
if (!incomment && linestate == LS_HASH) {
550
keyword = tline + (cp - tline);
552
kwlen = cp - keyword;
553
/* no way can we deal with a continuation inside a keyword */
554
if (strncmp(cp, "\\\n", 2) == 0)
556
if (strlcmp("ifdef", keyword, kwlen) == 0 ||
557
strlcmp("ifndef", keyword, kwlen) == 0) {
558
cp = skipcomment(cp);
559
if ((cursym = findsym(cp)) < 0)
562
retval = (keyword[2] == 'n')
563
? LT_FALSE : LT_TRUE;
564
if (value[cursym] == NULL)
565
retval = (retval == LT_TRUE)
566
? LT_FALSE : LT_TRUE;
568
retval = (retval == LT_TRUE)
569
? LT_TRUEI : LT_FALSEI;
572
} else if (strlcmp("if", keyword, kwlen) == 0)
573
retval = ifeval(&cp);
574
else if (strlcmp("elif", keyword, kwlen) == 0)
575
retval = ifeval(&cp) - LT_IF + LT_ELIF;
576
else if (strlcmp("else", keyword, kwlen) == 0)
578
else if (strlcmp("endif", keyword, kwlen) == 0)
581
linestate = LS_DIRTY;
584
cp = skipcomment(cp);
586
linestate = LS_DIRTY;
587
if (retval == LT_TRUE || retval == LT_FALSE ||
588
retval == LT_TRUEI || retval == LT_FALSEI)
590
if (retval == LT_ELTRUE || retval == LT_ELFALSE)
593
if (retval != LT_PLAIN && (wascomment || incomment)) {
596
linestate = LS_DIRTY;
598
/* skipcomment should have changed the state */
599
if (linestate == LS_HASH)
602
if (linestate == LS_DIRTY) {
604
cp = skipcomment(cp + 1);
606
debug("parser %s comment %s line",
607
comment_name[incomment], linestate_name[linestate]);
612
* These are the binary operators that are supported by the expression
613
* evaluator. Note that if support for division is added then we also
614
* need short-circuiting booleans because of divide-by-zero.
616
static int op_lt(int a, int b) { return (a < b); }
617
static int op_gt(int a, int b) { return (a > b); }
618
static int op_le(int a, int b) { return (a <= b); }
619
static int op_ge(int a, int b) { return (a >= b); }
620
static int op_eq(int a, int b) { return (a == b); }
621
static int op_ne(int a, int b) { return (a != b); }
622
static int op_or(int a, int b) { return (a || b); }
623
static int op_and(int a, int b) { return (a && b); }
626
* An evaluation function takes three arguments, as follows: (1) a pointer to
627
* an element of the precedence table which lists the operators at the current
628
* level of precedence; (2) a pointer to an integer which will receive the
629
* value of the expression; and (3) a pointer to a char* that points to the
630
* expression to be evaluated and that is updated to the end of the expression
631
* when evaluation is complete. The function returns LT_FALSE if the value of
632
* the expression is zero, LT_TRUE if it is non-zero, or LT_IF if the
633
* expression could not be evaluated.
637
typedef Linetype eval_fn(const struct ops *, int *, const char **);
639
static eval_fn eval_table, eval_unary;
642
* The precedence table. Expressions involving binary operators are evaluated
643
* in a table-driven way by eval_table. When it evaluates a subexpression it
644
* calls the inner function with its first argument pointing to the next
645
* element of the table. Innermost expressions have special non-table-driven
648
static const struct ops {
655
{ eval_table, { { "||", op_or } } },
656
{ eval_table, { { "&&", op_and } } },
657
{ eval_table, { { "==", op_eq },
659
{ eval_unary, { { "<=", op_le },
666
* Function for evaluating the innermost parts of expressions,
667
* viz. !expr (expr) defined(symbol) symbol number
668
* We reset the keepthis flag when we find a non-constant subexpression.
671
eval_unary(const struct ops *ops, int *valp, const char **cpp)
677
cp = skipcomment(*cpp);
679
debug("eval%d !", ops - eval_ops);
681
if (eval_unary(ops, valp, &cp) == LT_IF)
684
} else if (*cp == '(') {
686
debug("eval%d (", ops - eval_ops);
687
if (eval_table(eval_ops, valp, &cp) == LT_IF)
689
cp = skipcomment(cp);
692
} else if (isdigit((unsigned char)*cp)) {
693
debug("eval%d number", ops - eval_ops);
694
*valp = strtol(cp, &ep, 0);
696
} else if (strncmp(cp, "defined", 7) == 0 && endsym(cp[7])) {
697
cp = skipcomment(cp+7);
698
debug("eval%d defined", ops - eval_ops);
701
cp = skipcomment(cp);
705
*valp = (value[sym] != NULL);
707
cp = skipcomment(cp);
711
} else if (!endsym(*cp)) {
712
debug("eval%d symbol", ops - eval_ops);
716
if (value[sym] == NULL)
719
*valp = strtol(value[sym], &ep, 0);
720
if (*ep != '\0' || ep == value[sym])
726
debug("eval%d bad expr", ops - eval_ops);
731
debug("eval%d = %d", ops - eval_ops, *valp);
732
return (*valp ? LT_TRUE : LT_FALSE);
736
* Table-driven evaluation of binary operators.
739
eval_table(const struct ops *ops, int *valp, const char **cpp)
745
debug("eval%d", ops - eval_ops);
747
if (ops->inner(ops+1, valp, &cp) == LT_IF)
750
cp = skipcomment(cp);
751
for (op = ops->op; op->str != NULL; op++)
752
if (strncmp(cp, op->str, strlen(op->str)) == 0)
756
cp += strlen(op->str);
757
debug("eval%d %s", ops - eval_ops, op->str);
758
if (ops->inner(ops+1, &val, &cp) == LT_IF)
760
*valp = op->fn(*valp, val);
764
debug("eval%d = %d", ops - eval_ops, *valp);
765
return (*valp ? LT_TRUE : LT_FALSE);
769
* Evaluate the expression on a #if or #elif line. If we can work out
770
* the result we return LT_TRUE or LT_FALSE accordingly, otherwise we
771
* return just a generic LT_IF.
774
ifeval(const char **cpp)
779
debug("eval %s", *cpp);
780
keepthis = killconsts ? false : true;
781
ret = eval_table(eval_ops, &val, cpp);
782
debug("eval = %d", val);
783
return (keepthis ? LT_IF : ret);
787
* Skip over comments, strings, and character literals and stop at the
788
* next character position that is not whitespace. Between calls we keep
789
* the comment state in the global variable incomment, and we also adjust
790
* the global variable linestate when we see a newline.
791
* XXX: doesn't cope with the buffer splitting inside a state transition.
794
skipcomment(const char *cp)
796
if (text || ignoring[depth]) {
797
for (; isspace((unsigned char)*cp); cp++)
799
linestate = LS_START;
803
/* don't reset to LS_START after a line continuation */
804
if (strncmp(cp, "\\\n", 2) == 0)
806
else switch (incomment) {
808
if (strncmp(cp, "/\\\n", 3) == 0) {
809
incomment = STARTING_COMMENT;
811
} else if (strncmp(cp, "/*", 2) == 0) {
812
incomment = C_COMMENT;
814
} else if (strncmp(cp, "//", 2) == 0) {
815
incomment = CXX_COMMENT;
817
} else if (strncmp(cp, "\'", 1) == 0) {
818
incomment = CHAR_LITERAL;
819
linestate = LS_DIRTY;
821
} else if (strncmp(cp, "\"", 1) == 0) {
822
incomment = STRING_LITERAL;
823
linestate = LS_DIRTY;
825
} else if (strncmp(cp, "\n", 1) == 0) {
826
linestate = LS_START;
828
} else if (strchr(" \t", *cp) != NULL) {
834
if (strncmp(cp, "\n", 1) == 0) {
835
incomment = NO_COMMENT;
836
linestate = LS_START;
842
if ((incomment == CHAR_LITERAL && cp[0] == '\'') ||
843
(incomment == STRING_LITERAL && cp[0] == '\"')) {
844
incomment = NO_COMMENT;
846
} else if (cp[0] == '\\') {
851
} else if (strncmp(cp, "\n", 1) == 0) {
852
if (incomment == CHAR_LITERAL)
853
error("unterminated char literal");
855
error("unterminated string literal");
860
if (strncmp(cp, "*\\\n", 3) == 0) {
861
incomment = FINISHING_COMMENT;
863
} else if (strncmp(cp, "*/", 2) == 0) {
864
incomment = NO_COMMENT;
869
case STARTING_COMMENT:
871
incomment = C_COMMENT;
873
} else if (*cp == '/') {
874
incomment = CXX_COMMENT;
877
incomment = NO_COMMENT;
878
linestate = LS_DIRTY;
881
case FINISHING_COMMENT:
883
incomment = NO_COMMENT;
886
incomment = C_COMMENT;
895
* Skip over an identifier.
898
skipsym(const char *cp)
906
* Look for the symbol in the symbol table. If is is found, we return
907
* the symbol table index, else we return -1.
910
findsym(const char *str)
919
printf("%.*s\n", (int)(cp-str), str);
920
/* we don't care about the value of the symbol */
923
for (symind = 0; symind < nsyms; ++symind) {
924
if (strlcmp(symname[symind], str, cp-str) == 0) {
925
debug("findsym %s %s", symname[symind],
926
value[symind] ? value[symind] : "");
934
* Add a symbol to the symbol table.
937
addsym(bool ignorethis, bool definethis, char *sym)
942
symind = findsym(sym);
944
if (nsyms >= MAXSYMS)
945
errx(2, "too many symbols");
948
symname[symind] = sym;
949
ignore[symind] = ignorethis;
950
val = sym + (skipsym(sym) - sym);
953
value[symind] = val+1;
955
} else if (*val == '\0')
962
value[symind] = NULL;
967
* Compare s with n characters of t.
968
* The same as strncmp() except that it checks that s[n] == '\0'.
971
strlcmp(const char *s, const char *t, size_t n)
973
while (n-- && *t != '\0')
975
return ((unsigned char)*s - (unsigned char)*t);
978
return ((unsigned char)*s);
985
debug(const char *msg, ...)
997
error(const char *msg)
1000
warnx("%s: %d: %s", filename, linenum, msg);
1002
warnx("%s: %d: %s (#if line %d depth %d)",
1003
filename, linenum, msg, stifline[depth], depth);
1004
errx(2, "output may be truncated");
added
removed
scripts/unifdef.c
