Annotation of src/usr.bin/unifdef/unifdef.c, Revision 1.28
1.1 deraadt 1: /*
1.16 sthen 2: * Copyright (c) 2002 - 2014 Tony Finch <dot@dotat.at>
1.1 deraadt 3: *
4: * Redistribution and use in source and binary forms, with or without
5: * modification, are permitted provided that the following conditions
6: * are met:
7: * 1. Redistributions of source code must retain the above copyright
8: * notice, this list of conditions and the following disclaimer.
9: * 2. Redistributions in binary form must reproduce the above copyright
10: * notice, this list of conditions and the following disclaimer in the
11: * documentation and/or other materials provided with the distribution.
12: *
1.16 sthen 13: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1.1 deraadt 14: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.16 sthen 16: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
1.1 deraadt 17: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23: * SUCH DAMAGE.
24: */
25:
26: /*
27: * unifdef - remove ifdef'ed lines
28: *
1.16 sthen 29: * This code was derived from software contributed to Berkeley by Dave Yost.
30: * It was rewritten to support ANSI C by Tony Finch. The original version
31: * of unifdef carried the 4-clause BSD copyright licence. None of its code
32: * remains in this version (though some of the names remain) so it now
33: * carries a more liberal licence.
34: *
1.1 deraadt 35: * Wishlist:
36: * provide an option which will append the name of the
37: * appropriate symbol after #else's and #endif's
38: * provide an option which will check symbols after
39: * #else's and #endif's to see that they match their
40: * corresponding #ifdef or #ifndef
1.9 deraadt 41: *
1.16 sthen 42: * These require better buffer handling, which would also make
43: * it possible to handle all "dodgy" directives correctly.
1.1 deraadt 44: */
45:
1.22 deraadt 46: #include <sys/stat.h>
47:
48: #include <ctype.h>
49: #include <err.h>
50: #include <stdarg.h>
51: #include <stdbool.h>
52: #include <stdio.h>
53: #include <stdlib.h>
54: #include <string.h>
55: #include <unistd.h>
1.16 sthen 56:
57: static const char copyright[] =
58: #include "version.h"
1.26 mmcc 59: "@(#) $Author: mmcc $\n"
1.16 sthen 60: "@(#) $URL: http://dotat.at/prog/unifdef $\n"
61: ;
1.1 deraadt 62:
1.7 deraadt 63: /* types of input lines: */
64: typedef enum {
1.8 deraadt 65: LT_TRUEI, /* a true #if with ignore flag */
66: LT_FALSEI, /* a false #if with ignore flag */
67: LT_IF, /* an unknown #if */
1.7 deraadt 68: LT_TRUE, /* a true #if */
69: LT_FALSE, /* a false #if */
1.8 deraadt 70: LT_ELIF, /* an unknown #elif */
1.7 deraadt 71: LT_ELTRUE, /* a true #elif */
72: LT_ELFALSE, /* a false #elif */
73: LT_ELSE, /* #else */
74: LT_ENDIF, /* #endif */
1.9 deraadt 75: LT_DODGY, /* flag: directive is not on one line */
76: LT_DODGY_LAST = LT_DODGY + LT_ENDIF,
77: LT_PLAIN, /* ordinary line */
1.8 deraadt 78: LT_EOF, /* end of file */
1.16 sthen 79: LT_ERROR, /* unevaluable #if */
1.8 deraadt 80: LT_COUNT
1.7 deraadt 81: } Linetype;
82:
1.8 deraadt 83: static char const * const linetype_name[] = {
1.9 deraadt 84: "TRUEI", "FALSEI", "IF", "TRUE", "FALSE",
85: "ELIF", "ELTRUE", "ELFALSE", "ELSE", "ENDIF",
86: "DODGY TRUEI", "DODGY FALSEI",
87: "DODGY IF", "DODGY TRUE", "DODGY FALSE",
88: "DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE",
89: "DODGY ELSE", "DODGY ENDIF",
1.16 sthen 90: "PLAIN", "EOF", "ERROR"
1.8 deraadt 91: };
1.7 deraadt 92:
1.16 sthen 93: #define linetype_if2elif(lt) ((Linetype)(lt - LT_IF + LT_ELIF))
94: #define linetype_2dodgy(lt) ((Linetype)(lt + LT_DODGY))
95:
1.8 deraadt 96: /* state of #if processing */
1.7 deraadt 97: typedef enum {
1.8 deraadt 98: IS_OUTSIDE,
99: IS_FALSE_PREFIX, /* false #if followed by false #elifs */
100: IS_TRUE_PREFIX, /* first non-false #(el)if is true */
101: IS_PASS_MIDDLE, /* first non-false #(el)if is unknown */
102: IS_FALSE_MIDDLE, /* a false #elif after a pass state */
103: IS_TRUE_MIDDLE, /* a true #elif after a pass state */
104: IS_PASS_ELSE, /* an else after a pass state */
105: IS_FALSE_ELSE, /* an else after a true state */
106: IS_TRUE_ELSE, /* an else after only false states */
107: IS_FALSE_TRAILER, /* #elifs after a true are false */
108: IS_COUNT
109: } Ifstate;
110:
111: static char const * const ifstate_name[] = {
112: "OUTSIDE", "FALSE_PREFIX", "TRUE_PREFIX",
113: "PASS_MIDDLE", "FALSE_MIDDLE", "TRUE_MIDDLE",
114: "PASS_ELSE", "FALSE_ELSE", "TRUE_ELSE",
115: "FALSE_TRAILER"
116: };
117:
118: /* state of comment parser */
119: typedef enum {
120: NO_COMMENT = false, /* outside a comment */
121: C_COMMENT, /* in a comment like this one */
122: CXX_COMMENT, /* between // and end of line */
123: STARTING_COMMENT, /* just after slash-backslash-newline */
1.16 sthen 124: FINISHING_COMMENT, /* star-backslash-newline in a C comment */
125: CHAR_LITERAL, /* inside '' */
126: STRING_LITERAL /* inside "" */
1.7 deraadt 127: } Comment_state;
128:
1.8 deraadt 129: static char const * const comment_name[] = {
1.16 sthen 130: "NO", "C", "CXX", "STARTING", "FINISHING", "CHAR", "STRING"
1.1 deraadt 131: };
1.7 deraadt 132:
1.8 deraadt 133: /* state of preprocessor line parser */
134: typedef enum {
135: LS_START, /* only space and comments on this line */
136: LS_HASH, /* only space, comments, and a hash */
137: LS_DIRTY /* this line can't be a preprocessor line */
138: } Line_state;
1.7 deraadt 139:
1.8 deraadt 140: static char const * const linestate_name[] = {
141: "START", "HASH", "DIRTY"
142: };
1.7 deraadt 143:
144: /*
1.8 deraadt 145: * Minimum translation limits from ISO/IEC 9899:1999 5.2.4.1
1.7 deraadt 146: */
1.8 deraadt 147: #define MAXDEPTH 64 /* maximum #if nesting */
148: #define MAXLINE 4096 /* maximum length of line */
1.16 sthen 149: #define MAXSYMS 16384 /* maximum number of symbols */
1.7 deraadt 150:
151: /*
1.9 deraadt 152: * Sometimes when editing a keyword the replacement text is longer, so
153: * we leave some space at the end of the tline buffer to accommodate this.
154: */
155: #define EDITSLOP 10
156:
157: /*
1.8 deraadt 158: * Globals.
1.7 deraadt 159: */
160:
1.16 sthen 161: static bool compblank; /* -B: compress blank lines */
162: static bool lnblank; /* -b: blank deleted lines */
1.8 deraadt 163: static bool complement; /* -c: do the complement */
164: static bool debugging; /* -d: debugging reports */
1.16 sthen 165: static bool inplace; /* -m: modify in place */
1.9 deraadt 166: static bool iocccok; /* -e: fewer IOCCC errors */
1.16 sthen 167: static bool strictlogic; /* -K: keep ambiguous #ifs */
1.8 deraadt 168: static bool killconsts; /* -k: eval constant #ifs */
1.16 sthen 169: static bool lnnum; /* -n: add #line directives */
1.8 deraadt 170: static bool symlist; /* -s: output symbol list */
1.16 sthen 171: static bool symdepth; /* -S: output symbol depth */
1.8 deraadt 172: static bool text; /* -t: this is a text file */
173:
174: static const char *symname[MAXSYMS]; /* symbol name */
175: static const char *value[MAXSYMS]; /* -Dsym=value */
176: static bool ignore[MAXSYMS]; /* -iDsym or -iUsym */
177: static int nsyms; /* number of symbols */
178:
179: static FILE *input; /* input file pointer */
180: static const char *filename; /* input file name */
181: static int linenum; /* current line number */
1.16 sthen 182: static const char *linefile; /* file name for #line */
183: static FILE *output; /* output file pointer */
184: static const char *ofilename; /* output file name */
185: static const char *backext; /* backup extension */
186: static char *tempname; /* avoid splatting input */
1.8 deraadt 187:
1.9 deraadt 188: static char tline[MAXLINE+EDITSLOP];/* input buffer plus space */
1.8 deraadt 189: static char *keyword; /* used for editing #elif's */
190:
1.16 sthen 191: /*
192: * When processing a file, the output's newline style will match the
193: * input's, and unifdef correctly handles CRLF or LF endings whatever
194: * the platform's native style. The stdio streams are opened in binary
195: * mode to accommodate platforms whose native newline style is CRLF.
196: * When the output isn't a processed input file (when it is error /
197: * debug / diagnostic messages) then unifdef uses native line endings.
198: */
199:
200: static const char *newline; /* input file format */
201: static const char newline_unix[] = "\n";
202: static const char newline_crlf[] = "\r\n";
203:
1.8 deraadt 204: static Comment_state incomment; /* comment parser state */
205: static Line_state linestate; /* #if line parser state */
206: static Ifstate ifstate[MAXDEPTH]; /* #if processor state */
207: static bool ignoring[MAXDEPTH]; /* ignore comments state */
208: static int stifline[MAXDEPTH]; /* start of current #if */
209: static int depth; /* current #if nesting */
1.16 sthen 210: static int delcount; /* count of deleted lines */
211: static unsigned blankcount; /* count of blank lines */
212: static unsigned blankmax; /* maximum recent blankcount */
213: static bool constexpr; /* constant #if expression */
214: static bool zerosyms; /* to format symdepth output */
215: static bool firstsym; /* ditto */
1.8 deraadt 216:
1.16 sthen 217: static int exitmode; /* exit status mode */
1.8 deraadt 218: static int exitstat; /* program exit status */
219:
1.16 sthen 220: static void addsym1(bool, bool, char *);
221: static void addsym2(bool, const char *, const char *);
222: static char *astrcat(const char *, const char *);
223: static void cleantemp(void);
224: static void closeio(void);
1.8 deraadt 225: static void debug(const char *, ...);
1.16 sthen 226: static void debugsym(const char *, int);
227: static bool defundef(void);
228: static void defundefile(const char *);
229: static void done(void);
1.8 deraadt 230: static void error(const char *);
1.16 sthen 231: static int findsym(const char **);
1.8 deraadt 232: static void flushline(bool);
1.16 sthen 233: static void hashline(void);
234: static void help(void);
1.8 deraadt 235: static Linetype ifeval(const char **);
1.9 deraadt 236: static void ignoreoff(void);
237: static void ignoreon(void);
1.16 sthen 238: static void indirectsym(void);
1.9 deraadt 239: static void keywordedit(const char *);
1.16 sthen 240: static const char *matchsym(const char *, const char *);
1.8 deraadt 241: static void nest(void);
1.16 sthen 242: static Linetype parseline(void);
1.8 deraadt 243: static void process(void);
1.16 sthen 244: static void processinout(const char *, const char *);
245: static const char *skipargs(const char *);
1.8 deraadt 246: static const char *skipcomment(const char *);
1.16 sthen 247: static const char *skiphash(void);
248: static const char *skipline(const char *);
1.8 deraadt 249: static const char *skipsym(const char *);
250: static void state(Ifstate);
1.16 sthen 251: static void unnest(void);
1.8 deraadt 252: static void usage(void);
1.16 sthen 253: static void version(void);
254: static const char *xstrdup(const char *, const char *);
1.22 deraadt 255: static FILE * mktempmode(char *tmp, int mode);
1.7 deraadt 256:
1.16 sthen 257: #define endsym(c) (!isalnum((unsigned char)c) && c != '_')
1.7 deraadt 258:
1.8 deraadt 259: /*
260: * The main program.
261: */
1.7 deraadt 262: int
263: main(int argc, char *argv[])
264: {
1.19 deraadt 265: const char *errstr;
1.7 deraadt 266: int opt;
1.23 deraadt 267:
1.24 deraadt 268: if (pledge("stdio rpath wpath cpath fattr", NULL) == -1)
269: err(1, "pledge");
1.7 deraadt 270:
1.16 sthen 271: while ((opt = getopt(argc, argv, "i:D:U:f:I:M:o:x:bBcdehKklmnsStV")) != -1)
1.7 deraadt 272: switch (opt) {
273: case 'i': /* treat stuff controlled by these symbols as text */
274: /*
275: * For strict backwards-compatibility the U or D
276: * should be immediately after the -i but it doesn't
277: * matter much if we relax that requirement.
278: */
279: opt = *optarg++;
280: if (opt == 'D')
1.16 sthen 281: addsym1(true, true, optarg);
1.7 deraadt 282: else if (opt == 'U')
1.16 sthen 283: addsym1(true, false, optarg);
1.7 deraadt 284: else
285: usage();
286: break;
287: case 'D': /* define a symbol */
1.16 sthen 288: addsym1(false, true, optarg);
1.7 deraadt 289: break;
290: case 'U': /* undef a symbol */
1.16 sthen 291: addsym1(false, false, optarg);
292: break;
293: case 'I': /* no-op for compatibility with cpp */
294: break;
295: case 'b': /* blank deleted lines instead of omitting them */
296: case 'l': /* backwards compatibility */
297: lnblank = true;
1.7 deraadt 298: break;
1.16 sthen 299: case 'B': /* compress blank lines around removed section */
300: compblank = true;
1.11 avsm 301: break;
1.7 deraadt 302: case 'c': /* treat -D as -U and vice versa */
303: complement = true;
304: break;
1.8 deraadt 305: case 'd':
306: debugging = true;
307: break;
1.9 deraadt 308: case 'e': /* fewer errors from dodgy lines */
309: iocccok = true;
310: break;
1.16 sthen 311: case 'f': /* definitions file */
312: defundefile(optarg);
313: break;
314: case 'h':
315: help();
316: break;
317: case 'K': /* keep ambiguous #ifs */
318: strictlogic = true;
319: break;
1.7 deraadt 320: case 'k': /* process constant #ifs */
321: killconsts = true;
322: break;
1.16 sthen 323: case 'm': /* modify in place */
324: inplace = true;
325: break;
326: case 'M': /* modify in place and keep backup */
327: inplace = true;
328: backext = optarg;
329: break;
330: case 'n': /* add #line directive after deleted lines */
331: lnnum = true;
332: break;
333: case 'o': /* output to a file */
334: ofilename = optarg;
1.7 deraadt 335: break;
336: case 's': /* only output list of symbols that control #ifs */
337: symlist = true;
338: break;
1.16 sthen 339: case 'S': /* list symbols with their nesting depth */
340: symlist = symdepth = true;
341: break;
1.8 deraadt 342: case 't': /* don't parse C comments */
1.7 deraadt 343: text = true;
344: break;
1.16 sthen 345: case 'V':
346: version();
347: break;
348: case 'x':
1.19 deraadt 349: exitmode = strtonum(optarg, 0, 2, &errstr);
350: if (errstr)
351: errx(1, "-x %s: %s", optarg, errstr);
1.16 sthen 352: break;
1.7 deraadt 353: default:
354: usage();
355: }
356: argc -= optind;
357: argv += optind;
1.16 sthen 358: if (compblank && lnblank)
359: errx(2, "-B and -b are mutually exclusive");
360: if (symlist && (ofilename != NULL || inplace || argc > 1))
361: errx(2, "-s only works with one input file");
362: if (argc > 1 && ofilename != NULL)
363: errx(2, "-o cannot be used with multiple input files");
364: if (argc > 1 && !inplace)
365: errx(2, "multiple input files require -m or -M");
1.21 tedu 366: if (argc == 0 && inplace)
367: errx(2, "can't edit stdin in place");
1.16 sthen 368: if (argc == 0)
369: argc = 1;
370: if (argc == 1 && !inplace && ofilename == NULL)
371: ofilename = "-";
372: indirectsym();
373:
374: atexit(cleantemp);
375: if (ofilename != NULL)
376: processinout(*argv, ofilename);
377: else while (argc-- > 0) {
378: processinout(*argv, *argv);
379: argv++;
380: }
381: switch(exitmode) {
382: case(0): exit(exitstat);
383: case(1): exit(!exitstat);
384: case(2): exit(0);
385: default: abort(); /* bug */
1.7 deraadt 386: }
1.16 sthen 387: }
388:
389: /*
390: * File logistics.
391: */
392: static void
393: processinout(const char *ifn, const char *ofn)
394: {
395: struct stat st;
396:
397: if (ifn == NULL || strcmp(ifn, "-") == 0) {
398: filename = "[stdin]";
399: linefile = NULL;
1.22 deraadt 400: input = stdin;
1.7 deraadt 401: } else {
1.16 sthen 402: filename = ifn;
403: linefile = ifn;
404: input = fopen(ifn, "rb");
405: if (input == NULL)
406: err(2, "can't open %s", ifn);
407: }
408: if (strcmp(ofn, "-") == 0) {
1.22 deraadt 409: output = stdout;
1.16 sthen 410: process();
411: return;
412: }
413: if (stat(ofn, &st) < 0) {
414: output = fopen(ofn, "wb");
415: if (output == NULL)
416: err(2, "can't create %s", ofn);
1.8 deraadt 417: process();
1.16 sthen 418: return;
419: }
420:
421: tempname = astrcat(ofn, ".XXXXXX");
422: output = mktempmode(tempname, st.st_mode);
423: if (output == NULL)
424: err(2, "can't create %s", tempname);
425:
426: process();
427:
1.25 mmcc 428: if (backext != NULL && *backext != '\0') {
1.16 sthen 429: char *backname = astrcat(ofn, backext);
430: if (rename(ofn, backname) < 0)
431: err(2, "can't rename \"%s\" to \"%s\"", ofn, backname);
432: free(backname);
433: }
1.22 deraadt 434: if (rename(tempname, ofn) < 0)
1.16 sthen 435: err(2, "can't rename \"%s\" to \"%s\"", tempname, ofn);
436: free(tempname);
437: tempname = NULL;
438: }
439:
440: /*
441: * For cleaning up if there is an error.
442: */
443: static void
444: cleantemp(void)
445: {
446: if (tempname != NULL)
447: remove(tempname);
448: }
449:
450: /*
451: * Self-identification functions.
452: */
453:
454: static void
455: version(void)
456: {
457: const char *c = copyright;
458: for (;;) {
459: while (*++c != '$')
460: if (*c == '\0')
461: exit(0);
462: while (*++c != '$')
463: putc(*c, stderr);
464: putc('\n', stderr);
1.7 deraadt 465: }
1.16 sthen 466: }
1.7 deraadt 467:
1.16 sthen 468: static void
469: synopsis(FILE *fp)
470: {
471: fprintf(fp,
1.17 jmc 472: "usage: unifdef [-BbcdehKkmnSstV] [-[i]Dsym[=val]] [-[i]Usym] [-f defile]\n"
473: " [-M backext] [-o outfile] [-x 0 | 1 | 2] file ...\n");
1.7 deraadt 474: }
1.1 deraadt 475:
1.8 deraadt 476: static void
1.7 deraadt 477: usage(void)
1.1 deraadt 478: {
1.16 sthen 479: synopsis(stderr);
1.8 deraadt 480: exit(2);
481: }
482:
1.16 sthen 483: static void
484: help(void)
485: {
486: synopsis(stdout);
487: printf(
488: " -Dsym=val define preprocessor symbol with given value\n"
489: " -Dsym define preprocessor symbol with value 1\n"
490: " -Usym preprocessor symbol is undefined\n"
491: " -iDsym=val \\ ignore C strings and comments\n"
492: " -iDsym ) in sections controlled by these\n"
493: " -iUsym / preprocessor symbols\n"
494: " -fpath file containing #define and #undef directives\n"
495: " -b blank lines instead of deleting them\n"
496: " -B compress blank lines around deleted section\n"
497: " -c complement (invert) keep vs. delete\n"
498: " -d debugging mode\n"
499: " -e ignore multiline preprocessor directives\n"
500: " -h print help\n"
501: " -Ipath extra include file path (ignored)\n"
502: " -K disable && and || short-circuiting\n"
503: " -k process constant #if expressions\n"
504: " -Mext modify in place and keep backups\n"
505: " -m modify input files in place\n"
506: " -n add #line directives to output\n"
507: " -opath output file name\n"
508: " -S list #if control symbols with nesting\n"
509: " -s list #if control symbols\n"
510: " -t ignore C strings and comments\n"
511: " -V print version\n"
512: " -x{012} exit status mode\n"
513: );
514: exit(0);
515: }
516:
1.8 deraadt 517: /*
518: * A state transition function alters the global #if processing state
519: * in a particular way. The table below is indexed by the current
1.16 sthen 520: * processing state and the type of the current line.
1.8 deraadt 521: *
522: * Nesting is handled by keeping a stack of states; some transition
1.9 deraadt 523: * functions increase or decrease the depth. They also maintain the
1.8 deraadt 524: * ignore state on a stack. In some complicated cases they have to
525: * alter the preprocessor directive, as follows.
526: *
527: * When we have processed a group that starts off with a known-false
528: * #if/#elif sequence (which has therefore been deleted) followed by a
1.9 deraadt 529: * #elif that we don't understand and therefore must keep, we edit the
1.16 sthen 530: * latter into a #if to keep the nesting correct. We use memcpy() to
531: * overwrite the 4 byte token "elif" with "if " without a '\0' byte.
1.8 deraadt 532: *
533: * When we find a true #elif in a group, the following block will
534: * always be kept and the rest of the sequence after the next #elif or
1.9 deraadt 535: * #else will be discarded. We edit the #elif into a #else and the
1.8 deraadt 536: * following directive to #endif since this has the desired behaviour.
1.9 deraadt 537: *
538: * "Dodgy" directives are split across multiple lines, the most common
539: * example being a multi-line comment hanging off the right of the
540: * directive. We can handle them correctly only if there is no change
541: * from printing to dropping (or vice versa) caused by that directive.
542: * If the directive is the first of a group we have a choice between
543: * failing with an error, or passing it through unchanged instead of
544: * evaluating it. The latter is not the default to avoid questions from
545: * users about unifdef unexpectedly leaving behind preprocessor directives.
1.8 deraadt 546: */
547: typedef void state_fn(void);
548:
549: /* report an error */
1.16 sthen 550: static void Eelif (void) { error("Inappropriate #elif"); }
551: static void Eelse (void) { error("Inappropriate #else"); }
552: static void Eendif(void) { error("Inappropriate #endif"); }
553: static void Eeof (void) { error("Premature EOF"); }
554: static void Eioccc(void) { error("Obfuscated preprocessor control line"); }
1.8 deraadt 555: /* plain line handling */
1.16 sthen 556: static void print (void) { flushline(true); }
557: static void drop (void) { flushline(false); }
1.8 deraadt 558: /* output lacks group's start line */
1.16 sthen 559: static void Strue (void) { drop(); ignoreoff(); state(IS_TRUE_PREFIX); }
560: static void Sfalse(void) { drop(); ignoreoff(); state(IS_FALSE_PREFIX); }
561: static void Selse (void) { drop(); state(IS_TRUE_ELSE); }
1.8 deraadt 562: /* print/pass this block */
1.16 sthen 563: static void Pelif (void) { print(); ignoreoff(); state(IS_PASS_MIDDLE); }
564: static void Pelse (void) { print(); state(IS_PASS_ELSE); }
565: static void Pendif(void) { print(); unnest(); }
1.8 deraadt 566: /* discard this block */
1.16 sthen 567: static void Dfalse(void) { drop(); ignoreoff(); state(IS_FALSE_TRAILER); }
568: static void Delif (void) { drop(); ignoreoff(); state(IS_FALSE_MIDDLE); }
569: static void Delse (void) { drop(); state(IS_FALSE_ELSE); }
570: static void Dendif(void) { drop(); unnest(); }
1.8 deraadt 571: /* first line of group */
1.16 sthen 572: static void Fdrop (void) { nest(); Dfalse(); }
573: static void Fpass (void) { nest(); Pelif(); }
574: static void Ftrue (void) { nest(); Strue(); }
575: static void Ffalse(void) { nest(); Sfalse(); }
1.9 deraadt 576: /* variable pedantry for obfuscated lines */
1.16 sthen 577: static void Oiffy (void) { if (!iocccok) Eioccc(); Fpass(); ignoreon(); }
578: static void Oif (void) { if (!iocccok) Eioccc(); Fpass(); }
579: static void Oelif (void) { if (!iocccok) Eioccc(); Pelif(); }
1.8 deraadt 580: /* ignore comments in this block */
1.16 sthen 581: static void Idrop (void) { Fdrop(); ignoreon(); }
582: static void Itrue (void) { Ftrue(); ignoreon(); }
583: static void Ifalse(void) { Ffalse(); ignoreon(); }
584: /* modify this line */
585: static void Mpass (void) { memcpy(keyword, "if ", 4); Pelif(); }
586: static void Mtrue (void) { keywordedit("else"); state(IS_TRUE_MIDDLE); }
587: static void Melif (void) { keywordedit("endif"); state(IS_FALSE_TRAILER); }
588: static void Melse (void) { keywordedit("endif"); state(IS_FALSE_ELSE); }
1.8 deraadt 589:
590: static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
591: /* IS_OUTSIDE */
1.9 deraadt 592: { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif,
593: Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif,
1.16 sthen 594: print, done, abort },
1.8 deraadt 595: /* IS_FALSE_PREFIX */
1.9 deraadt 596: { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif,
597: Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc,
1.16 sthen 598: drop, Eeof, abort },
1.8 deraadt 599: /* IS_TRUE_PREFIX */
1.9 deraadt 600: { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif,
601: Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
1.16 sthen 602: print, Eeof, abort },
1.8 deraadt 603: /* IS_PASS_MIDDLE */
1.9 deraadt 604: { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif,
605: Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif,
1.16 sthen 606: print, Eeof, abort },
1.8 deraadt 607: /* IS_FALSE_MIDDLE */
1.9 deraadt 608: { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif,
609: Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
1.16 sthen 610: drop, Eeof, abort },
1.8 deraadt 611: /* IS_TRUE_MIDDLE */
1.9 deraadt 612: { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif,
613: Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif,
1.16 sthen 614: print, Eeof, abort },
1.8 deraadt 615: /* IS_PASS_ELSE */
1.9 deraadt 616: { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif,
617: Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif,
1.16 sthen 618: print, Eeof, abort },
1.8 deraadt 619: /* IS_FALSE_ELSE */
1.9 deraadt 620: { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif,
621: Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc,
1.16 sthen 622: drop, Eeof, abort },
1.8 deraadt 623: /* IS_TRUE_ELSE */
1.9 deraadt 624: { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif,
625: Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc,
1.16 sthen 626: print, Eeof, abort },
1.8 deraadt 627: /* IS_FALSE_TRAILER */
1.9 deraadt 628: { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif,
629: Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc,
1.16 sthen 630: drop, Eeof, abort }
1.9 deraadt 631: /*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF
632: TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY)
1.16 sthen 633: PLAIN EOF ERROR */
1.8 deraadt 634: };
635:
636: /*
637: * State machine utility functions
638: */
639: static void
1.9 deraadt 640: ignoreoff(void)
641: {
1.16 sthen 642: if (depth == 0)
643: abort(); /* bug */
1.9 deraadt 644: ignoring[depth] = ignoring[depth-1];
645: }
646: static void
647: ignoreon(void)
648: {
649: ignoring[depth] = true;
650: }
651: static void
652: keywordedit(const char *replacement)
653: {
1.16 sthen 654: snprintf(keyword, tline + sizeof(tline) - keyword,
655: "%s%s", replacement, newline);
1.9 deraadt 656: print();
657: }
658: static void
1.8 deraadt 659: nest(void)
660: {
1.16 sthen 661: if (depth > MAXDEPTH-1)
662: abort(); /* bug */
663: if (depth == MAXDEPTH-1)
664: error("Too many levels of nesting");
1.8 deraadt 665: depth += 1;
666: stifline[depth] = linenum;
667: }
1.16 sthen 668: static void
669: unnest(void)
670: {
671: if (depth == 0)
672: abort(); /* bug */
673: depth -= 1;
674: }
1.8 deraadt 675: static void
676: state(Ifstate is)
677: {
678: ifstate[depth] = is;
679: }
680:
1.7 deraadt 681: /*
1.16 sthen 682: * The last state transition function. When this is called,
683: * lineval == LT_EOF, so the process() loop will terminate.
684: */
685: static void
686: done(void)
687: {
688: if (incomment)
689: error("EOF in comment");
690: closeio();
691: }
692:
693: /*
1.8 deraadt 694: * Write a line to the output or not, according to command line options.
1.16 sthen 695: * If writing fails, closeio() will print the error and exit.
1.8 deraadt 696: */
697: static void
698: flushline(bool keep)
699: {
700: if (symlist)
701: return;
1.16 sthen 702: if (keep ^ complement) {
703: bool blankline = tline[strspn(tline, " \t\r\n")] == '\0';
704: if (blankline && compblank && blankcount != blankmax) {
705: delcount += 1;
706: blankcount += 1;
707: } else {
708: if (lnnum && delcount > 0)
709: hashline();
710: if (fputs(tline, output) == EOF)
711: closeio();
712: delcount = 0;
713: blankmax = blankcount = blankline ? blankcount + 1 : 0;
714: }
715: } else {
716: if (lnblank && fputs(newline, output) == EOF)
717: closeio();
1.8 deraadt 718: exitstat = 1;
1.16 sthen 719: delcount += 1;
720: blankcount = 0;
1.7 deraadt 721: }
1.16 sthen 722: if (debugging && fflush(output) == EOF)
723: closeio();
724: }
725:
726: /*
727: * Format of #line directives depends on whether we know the input filename.
728: */
729: static void
730: hashline(void)
731: {
732: int e;
733:
734: if (linefile == NULL)
735: e = fprintf(output, "#line %d%s", linenum, newline);
736: else
737: e = fprintf(output, "#line %d \"%s\"%s",
738: linenum, linefile, newline);
739: if (e < 0)
740: closeio();
741: }
742:
743: /*
744: * Flush the output and handle errors.
745: */
746: static void
747: closeio(void)
748: {
749: /* Tidy up after findsym(). */
750: if (symdepth && !zerosyms)
751: printf("\n");
752: if (output != NULL && (ferror(output) || fclose(output) == EOF))
753: err(2, "%s: can't write to output", filename);
754: fclose(input);
1.7 deraadt 755: }
1.3 deraadt 756:
1.7 deraadt 757: /*
1.8 deraadt 758: * The driver for the state machine.
1.7 deraadt 759: */
1.8 deraadt 760: static void
761: process(void)
1.7 deraadt 762: {
1.16 sthen 763: Linetype lineval = LT_PLAIN;
764: /* When compressing blank lines, act as if the file
765: is preceded by a large number of blank lines. */
766: blankmax = blankcount = 1000;
767: zerosyms = true;
768: newline = NULL;
769: linenum = 0;
770: while (lineval != LT_EOF) {
771: lineval = parseline();
772: trans_table[ifstate[depth]][lineval]();
773: debug("process line %d %s -> %s depth %d",
774: linenum, linetype_name[lineval],
1.8 deraadt 775: ifstate_name[ifstate[depth]], depth);
1.1 deraadt 776: }
777: }
778:
1.7 deraadt 779: /*
1.8 deraadt 780: * Parse a line and determine its type. We keep the preprocessor line
1.16 sthen 781: * parser state between calls in the global variable linestate, with
782: * help from skipcomment().
1.7 deraadt 783: */
1.8 deraadt 784: static Linetype
1.16 sthen 785: parseline(void)
1.3 deraadt 786: {
1.7 deraadt 787: const char *cp;
1.8 deraadt 788: int cursym;
1.3 deraadt 789: Linetype retval;
1.8 deraadt 790: Comment_state wascomment;
1.3 deraadt 791:
1.16 sthen 792: wascomment = incomment;
793: cp = skiphash();
794: if (cp == NULL)
1.8 deraadt 795: return (LT_EOF);
1.16 sthen 796: if (newline == NULL) {
797: if (strrchr(tline, '\n') == strrchr(tline, '\r') + 1)
798: newline = newline_crlf;
799: else
800: newline = newline_unix;
801: }
802: if (*cp == '\0') {
803: retval = LT_PLAIN;
804: goto done;
1.8 deraadt 805: }
1.16 sthen 806: keyword = tline + (cp - tline);
807: if ((cp = matchsym("ifdef", keyword)) != NULL ||
808: (cp = matchsym("ifndef", keyword)) != NULL) {
809: cp = skipcomment(cp);
810: if ((cursym = findsym(&cp)) < 0)
811: retval = LT_IF;
812: else {
813: retval = (keyword[2] == 'n')
814: ? LT_FALSE : LT_TRUE;
815: if (value[cursym] == NULL)
816: retval = (retval == LT_TRUE)
817: ? LT_FALSE : LT_TRUE;
818: if (ignore[cursym])
819: retval = (retval == LT_TRUE)
820: ? LT_TRUEI : LT_FALSEI;
821: }
822: } else if ((cp = matchsym("if", keyword)) != NULL)
823: retval = ifeval(&cp);
824: else if ((cp = matchsym("elif", keyword)) != NULL)
825: retval = linetype_if2elif(ifeval(&cp));
826: else if ((cp = matchsym("else", keyword)) != NULL)
827: retval = LT_ELSE;
828: else if ((cp = matchsym("endif", keyword)) != NULL)
829: retval = LT_ENDIF;
830: else {
831: cp = skipsym(keyword);
1.9 deraadt 832: /* no way can we deal with a continuation inside a keyword */
1.16 sthen 833: if (strncmp(cp, "\\\r\n", 3) == 0 ||
834: strncmp(cp, "\\\n", 2) == 0)
1.8 deraadt 835: Eioccc();
1.16 sthen 836: cp = skipline(cp);
837: retval = LT_PLAIN;
838: goto done;
839: }
840: cp = skipcomment(cp);
841: if (*cp != '\0') {
842: cp = skipline(cp);
843: if (retval == LT_TRUE || retval == LT_FALSE ||
844: retval == LT_TRUEI || retval == LT_FALSEI)
845: retval = LT_IF;
846: if (retval == LT_ELTRUE || retval == LT_ELFALSE)
847: retval = LT_ELIF;
848: }
849: /* the following can happen if the last line of the file lacks a
850: newline or if there is too much whitespace in a directive */
851: if (linestate == LS_HASH) {
852: long len = cp - tline;
853: if (fgets(tline + len, MAXLINE - len, input) == NULL) {
854: if (ferror(input))
855: err(2, "can't read %s", filename);
856: /* append the missing newline at eof */
1.18 miod 857: strlcpy(tline + len, newline, sizeof(tline) - len);
1.16 sthen 858: cp += strlen(newline);
859: linestate = LS_START;
860: } else {
1.8 deraadt 861: linestate = LS_DIRTY;
1.7 deraadt 862: }
863: }
1.16 sthen 864: if (retval != LT_PLAIN && (wascomment || linestate != LS_START)) {
865: retval = linetype_2dodgy(retval);
866: linestate = LS_DIRTY;
1.8 deraadt 867: }
1.16 sthen 868: done:
869: debug("parser line %d state %s comment %s line", linenum,
1.8 deraadt 870: comment_name[incomment], linestate_name[linestate]);
1.7 deraadt 871: return (retval);
872: }
873:
874: /*
1.16 sthen 875: * These are the binary operators that are supported by the expression
876: * evaluator.
1.7 deraadt 877: */
1.16 sthen 878: static Linetype op_strict(long *p, long v, Linetype at, Linetype bt) {
879: if(at == LT_IF || bt == LT_IF) return (LT_IF);
880: return (*p = v, v ? LT_TRUE : LT_FALSE);
881: }
882: static Linetype op_lt(long *p, Linetype at, long a, Linetype bt, long b) {
883: return op_strict(p, a < b, at, bt);
1.8 deraadt 884: }
1.16 sthen 885: static Linetype op_gt(long *p, Linetype at, long a, Linetype bt, long b) {
886: return op_strict(p, a > b, at, bt);
1.8 deraadt 887: }
1.16 sthen 888: static Linetype op_le(long *p, Linetype at, long a, Linetype bt, long b) {
889: return op_strict(p, a <= b, at, bt);
1.8 deraadt 890: }
1.16 sthen 891: static Linetype op_ge(long *p, Linetype at, long a, Linetype bt, long b) {
892: return op_strict(p, a >= b, at, bt);
1.8 deraadt 893: }
1.16 sthen 894: static Linetype op_eq(long *p, Linetype at, long a, Linetype bt, long b) {
895: return op_strict(p, a == b, at, bt);
1.8 deraadt 896: }
1.16 sthen 897: static Linetype op_ne(long *p, Linetype at, long a, Linetype bt, long b) {
898: return op_strict(p, a != b, at, bt);
1.8 deraadt 899: }
1.16 sthen 900: static Linetype op_or(long *p, Linetype at, long a, Linetype bt, long b) {
901: if (!strictlogic && (at == LT_TRUE || bt == LT_TRUE))
902: return (*p = 1, LT_TRUE);
903: return op_strict(p, a || b, at, bt);
1.8 deraadt 904: }
1.16 sthen 905: static Linetype op_and(long *p, Linetype at, long a, Linetype bt, long b) {
906: if (!strictlogic && (at == LT_FALSE || bt == LT_FALSE))
907: return (*p = 0, LT_FALSE);
908: return op_strict(p, a && b, at, bt);
1.7 deraadt 909: }
910:
911: /*
1.8 deraadt 912: * An evaluation function takes three arguments, as follows: (1) a pointer to
913: * an element of the precedence table which lists the operators at the current
914: * level of precedence; (2) a pointer to an integer which will receive the
915: * value of the expression; and (3) a pointer to a char* that points to the
916: * expression to be evaluated and that is updated to the end of the expression
917: * when evaluation is complete. The function returns LT_FALSE if the value of
1.16 sthen 918: * the expression is zero, LT_TRUE if it is non-zero, LT_IF if the expression
919: * depends on an unknown symbol, or LT_ERROR if there is a parse failure.
1.7 deraadt 920: */
1.8 deraadt 921: struct ops;
922:
1.16 sthen 923: typedef Linetype eval_fn(const struct ops *, long *, const char **);
1.8 deraadt 924:
925: static eval_fn eval_table, eval_unary;
926:
927: /*
928: * The precedence table. Expressions involving binary operators are evaluated
929: * in a table-driven way by eval_table. When it evaluates a subexpression it
930: * calls the inner function with its first argument pointing to the next
931: * element of the table. Innermost expressions have special non-table-driven
932: * handling.
933: */
1.16 sthen 934: struct op {
935: const char *str;
936: Linetype (*fn)(long *, Linetype, long, Linetype, long);
937: };
938: struct ops {
1.8 deraadt 939: eval_fn *inner;
1.16 sthen 940: struct op op[5];
941: };
942: static const struct ops eval_ops[] = {
1.8 deraadt 943: { eval_table, { { "||", op_or } } },
944: { eval_table, { { "&&", op_and } } },
945: { eval_table, { { "==", op_eq },
946: { "!=", op_ne } } },
947: { eval_unary, { { "<=", op_le },
948: { ">=", op_ge },
949: { "<", op_lt },
950: { ">", op_gt } } }
951: };
1.7 deraadt 952:
1.16 sthen 953: /* Current operator precedence level */
954: static long prec(const struct ops *ops)
955: {
956: return (ops - eval_ops);
957: }
958:
1.7 deraadt 959: /*
960: * Function for evaluating the innermost parts of expressions,
1.16 sthen 961: * viz. !expr (expr) number defined(symbol) symbol
962: * We reset the constexpr flag in the last two cases.
1.7 deraadt 963: */
1.8 deraadt 964: static Linetype
1.16 sthen 965: eval_unary(const struct ops *ops, long *valp, const char **cpp)
1.7 deraadt 966: {
967: const char *cp;
968: char *ep;
969: int sym;
1.16 sthen 970: bool defparen;
971: Linetype lt;
1.7 deraadt 972:
973: cp = skipcomment(*cpp);
1.8 deraadt 974: if (*cp == '!') {
1.16 sthen 975: debug("eval%d !", prec(ops));
1.7 deraadt 976: cp++;
1.16 sthen 977: lt = eval_unary(ops, valp, &cp);
978: if (lt == LT_ERROR)
979: return (LT_ERROR);
980: if (lt != LT_IF) {
981: *valp = !*valp;
982: lt = *valp ? LT_TRUE : LT_FALSE;
983: }
1.7 deraadt 984: } else if (*cp == '(') {
985: cp++;
1.16 sthen 986: debug("eval%d (", prec(ops));
987: lt = eval_table(eval_ops, valp, &cp);
988: if (lt == LT_ERROR)
989: return (LT_ERROR);
1.7 deraadt 990: cp = skipcomment(cp);
991: if (*cp++ != ')')
1.16 sthen 992: return (LT_ERROR);
1.7 deraadt 993: } else if (isdigit((unsigned char)*cp)) {
1.16 sthen 994: debug("eval%d number", prec(ops));
1.7 deraadt 995: *valp = strtol(cp, &ep, 0);
1.16 sthen 996: if (ep == cp)
997: return (LT_ERROR);
998: lt = *valp ? LT_TRUE : LT_FALSE;
999: cp = ep;
1000: } else if (matchsym("defined", cp) != NULL) {
1.7 deraadt 1001: cp = skipcomment(cp+7);
1.16 sthen 1002: if (*cp == '(') {
1003: cp = skipcomment(cp+1);
1004: defparen = true;
1005: } else {
1006: defparen = false;
1007: }
1008: sym = findsym(&cp);
1.7 deraadt 1009: cp = skipcomment(cp);
1.16 sthen 1010: if (defparen && *cp++ != ')') {
1011: debug("eval%d defined missing ')'", prec(ops));
1012: return (LT_ERROR);
1013: }
1014: if (sym < 0) {
1015: debug("eval%d defined unknown", prec(ops));
1016: lt = LT_IF;
1017: } else {
1018: debug("eval%d defined %s", prec(ops), symname[sym]);
1019: *valp = (value[sym] != NULL);
1020: lt = *valp ? LT_TRUE : LT_FALSE;
1021: }
1022: constexpr = false;
1.7 deraadt 1023: } else if (!endsym(*cp)) {
1.16 sthen 1024: debug("eval%d symbol", prec(ops));
1025: sym = findsym(&cp);
1026: if (sym < 0) {
1027: lt = LT_IF;
1028: cp = skipargs(cp);
1029: } else if (value[sym] == NULL) {
1.7 deraadt 1030: *valp = 0;
1.16 sthen 1031: lt = LT_FALSE;
1032: } else {
1.7 deraadt 1033: *valp = strtol(value[sym], &ep, 0);
1034: if (*ep != '\0' || ep == value[sym])
1.16 sthen 1035: return (LT_ERROR);
1036: lt = *valp ? LT_TRUE : LT_FALSE;
1037: cp = skipargs(cp);
1.7 deraadt 1038: }
1.16 sthen 1039: constexpr = false;
1040: } else {
1041: debug("eval%d bad expr", prec(ops));
1042: return (LT_ERROR);
1043: }
1.7 deraadt 1044:
1045: *cpp = cp;
1.16 sthen 1046: debug("eval%d = %d", prec(ops), *valp);
1047: return (lt);
1.7 deraadt 1048: }
1049:
1050: /*
1051: * Table-driven evaluation of binary operators.
1052: */
1.8 deraadt 1053: static Linetype
1.16 sthen 1054: eval_table(const struct ops *ops, long *valp, const char **cpp)
1.7 deraadt 1055: {
1.8 deraadt 1056: const struct op *op;
1.7 deraadt 1057: const char *cp;
1.16 sthen 1058: long val;
1059: Linetype lt, rt;
1.7 deraadt 1060:
1.16 sthen 1061: debug("eval%d", prec(ops));
1.7 deraadt 1062: cp = *cpp;
1.16 sthen 1063: lt = ops->inner(ops+1, valp, &cp);
1064: if (lt == LT_ERROR)
1065: return (LT_ERROR);
1.7 deraadt 1066: for (;;) {
1067: cp = skipcomment(cp);
1068: for (op = ops->op; op->str != NULL; op++)
1069: if (strncmp(cp, op->str, strlen(op->str)) == 0)
1070: break;
1071: if (op->str == NULL)
1072: break;
1073: cp += strlen(op->str);
1.16 sthen 1074: debug("eval%d %s", prec(ops), op->str);
1075: rt = ops->inner(ops+1, &val, &cp);
1076: if (rt == LT_ERROR)
1077: return (LT_ERROR);
1078: lt = op->fn(valp, lt, *valp, rt, val);
1.7 deraadt 1079: }
1080:
1081: *cpp = cp;
1.16 sthen 1082: debug("eval%d = %d", prec(ops), *valp);
1083: debug("eval%d lt = %s", prec(ops), linetype_name[lt]);
1084: return (lt);
1.1 deraadt 1085: }
1.7 deraadt 1086:
1.1 deraadt 1087: /*
1.7 deraadt 1088: * Evaluate the expression on a #if or #elif line. If we can work out
1089: * the result we return LT_TRUE or LT_FALSE accordingly, otherwise we
1.8 deraadt 1090: * return just a generic LT_IF.
1.1 deraadt 1091: */
1.8 deraadt 1092: static Linetype
1.7 deraadt 1093: ifeval(const char **cpp)
1094: {
1.16 sthen 1095: Linetype ret;
1096: long val = 0;
1.7 deraadt 1097:
1098: debug("eval %s", *cpp);
1.16 sthen 1099: constexpr = killconsts ? false : true;
1.8 deraadt 1100: ret = eval_table(eval_ops, &val, cpp);
1.16 sthen 1101: debug("eval = %d", val);
1102: return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
1103: }
1104:
1105: /*
1106: * Read a line and examine its initial part to determine if it is a
1107: * preprocessor directive. Returns NULL on EOF, or a pointer to a
1108: * preprocessor directive name, or a pointer to the zero byte at the
1109: * end of the line.
1110: */
1111: static const char *
1112: skiphash(void)
1113: {
1114: const char *cp;
1115:
1116: linenum++;
1117: if (fgets(tline, MAXLINE, input) == NULL) {
1118: if (ferror(input))
1119: err(2, "can't read %s", filename);
1120: else
1121: return (NULL);
1122: }
1123: cp = skipcomment(tline);
1124: if (linestate == LS_START && *cp == '#') {
1125: linestate = LS_HASH;
1126: return (skipcomment(cp + 1));
1127: } else if (*cp == '\0') {
1128: return (cp);
1129: } else {
1130: return (skipline(cp));
1131: }
1132: }
1133:
1134: /*
1135: * Mark a line dirty and consume the rest of it, keeping track of the
1136: * lexical state.
1137: */
1138: static const char *
1139: skipline(const char *cp)
1140: {
1.27 mmcc 1141: const char *pcp;
1.16 sthen 1142: if (*cp != '\0')
1143: linestate = LS_DIRTY;
1.27 mmcc 1144: while (*cp != '\0') {
1145: cp = skipcomment(pcp = cp);
1146: if (pcp == cp)
1147: cp++;
1148: }
1.16 sthen 1149: return (cp);
1.7 deraadt 1150: }
1151:
1152: /*
1.16 sthen 1153: * Skip over comments, strings, and character literals and stop at the
1154: * next character position that is not whitespace. Between calls we keep
1155: * the comment state in the global variable incomment, and we also adjust
1156: * the global variable linestate when we see a newline.
1.8 deraadt 1157: * XXX: doesn't cope with the buffer splitting inside a state transition.
1.7 deraadt 1158: */
1.8 deraadt 1159: static const char *
1.7 deraadt 1160: skipcomment(const char *cp)
1.3 deraadt 1161: {
1.8 deraadt 1162: if (text || ignoring[depth]) {
1.11 avsm 1163: for (; isspace((unsigned char)*cp); cp++)
1164: if (*cp == '\n')
1165: linestate = LS_START;
1.8 deraadt 1166: return (cp);
1167: }
1168: while (*cp != '\0')
1.16 sthen 1169: /* don't reset to LS_START after a line continuation */
1170: if (strncmp(cp, "\\\r\n", 3) == 0)
1171: cp += 3;
1172: else if (strncmp(cp, "\\\n", 2) == 0)
1.8 deraadt 1173: cp += 2;
1174: else switch (incomment) {
1175: case NO_COMMENT:
1.16 sthen 1176: if (strncmp(cp, "/\\\r\n", 4) == 0) {
1177: incomment = STARTING_COMMENT;
1178: cp += 4;
1179: } else if (strncmp(cp, "/\\\n", 3) == 0) {
1.8 deraadt 1180: incomment = STARTING_COMMENT;
1181: cp += 3;
1182: } else if (strncmp(cp, "/*", 2) == 0) {
1.3 deraadt 1183: incomment = C_COMMENT;
1.8 deraadt 1184: cp += 2;
1185: } else if (strncmp(cp, "//", 2) == 0) {
1186: incomment = CXX_COMMENT;
1187: cp += 2;
1.16 sthen 1188: } else if (strncmp(cp, "\'", 1) == 0) {
1189: incomment = CHAR_LITERAL;
1190: linestate = LS_DIRTY;
1191: cp += 1;
1192: } else if (strncmp(cp, "\"", 1) == 0) {
1193: incomment = STRING_LITERAL;
1194: linestate = LS_DIRTY;
1195: cp += 1;
1.8 deraadt 1196: } else if (strncmp(cp, "\n", 1) == 0) {
1197: linestate = LS_START;
1198: cp += 1;
1.16 sthen 1199: } else if (strchr(" \r\t", *cp) != NULL) {
1.8 deraadt 1200: cp += 1;
1201: } else
1202: return (cp);
1203: continue;
1204: case CXX_COMMENT:
1205: if (strncmp(cp, "\n", 1) == 0) {
1206: incomment = NO_COMMENT;
1207: linestate = LS_START;
1.3 deraadt 1208: }
1.8 deraadt 1209: cp += 1;
1210: continue;
1.16 sthen 1211: case CHAR_LITERAL:
1212: case STRING_LITERAL:
1213: if ((incomment == CHAR_LITERAL && cp[0] == '\'') ||
1214: (incomment == STRING_LITERAL && cp[0] == '\"')) {
1215: incomment = NO_COMMENT;
1216: cp += 1;
1217: } else if (cp[0] == '\\') {
1218: if (cp[1] == '\0')
1219: cp += 1;
1220: else
1221: cp += 2;
1222: } else if (strncmp(cp, "\n", 1) == 0) {
1223: if (incomment == CHAR_LITERAL)
1.26 mmcc 1224: error("Unterminated char literal");
1.16 sthen 1225: else
1.26 mmcc 1226: error("Unterminated string literal");
1.16 sthen 1227: } else
1228: cp += 1;
1229: continue;
1.8 deraadt 1230: case C_COMMENT:
1.16 sthen 1231: if (strncmp(cp, "*\\\r\n", 4) == 0) {
1232: incomment = FINISHING_COMMENT;
1233: cp += 4;
1234: } else if (strncmp(cp, "*\\\n", 3) == 0) {
1.8 deraadt 1235: incomment = FINISHING_COMMENT;
1236: cp += 3;
1237: } else if (strncmp(cp, "*/", 2) == 0) {
1238: incomment = NO_COMMENT;
1239: cp += 2;
1240: } else
1241: cp += 1;
1242: continue;
1243: case STARTING_COMMENT:
1244: if (*cp == '*') {
1245: incomment = C_COMMENT;
1246: cp += 1;
1247: } else if (*cp == '/') {
1.3 deraadt 1248: incomment = CXX_COMMENT;
1.8 deraadt 1249: cp += 1;
1250: } else {
1251: incomment = NO_COMMENT;
1252: linestate = LS_DIRTY;
1.3 deraadt 1253: }
1.8 deraadt 1254: continue;
1255: case FINISHING_COMMENT:
1256: if (*cp == '/') {
1257: incomment = NO_COMMENT;
1258: cp += 1;
1259: } else
1260: incomment = C_COMMENT;
1261: continue;
1262: default:
1.16 sthen 1263: abort(); /* bug */
1.3 deraadt 1264: }
1.8 deraadt 1265: return (cp);
1.1 deraadt 1266: }
1.7 deraadt 1267:
1268: /*
1.16 sthen 1269: * Skip macro arguments.
1270: */
1271: static const char *
1272: skipargs(const char *cp)
1273: {
1274: const char *ocp = cp;
1275: int level = 0;
1276: cp = skipcomment(cp);
1277: if (*cp != '(')
1278: return (cp);
1279: do {
1280: if (*cp == '(')
1281: level++;
1282: if (*cp == ')')
1283: level--;
1284: cp = skipcomment(cp+1);
1285: } while (level != 0 && *cp != '\0');
1286: if (level == 0)
1287: return (cp);
1288: else
1289: /* Rewind and re-detect the syntax error later. */
1290: return (ocp);
1291: }
1292:
1293: /*
1.7 deraadt 1294: * Skip over an identifier.
1295: */
1.8 deraadt 1296: static const char *
1.7 deraadt 1297: skipsym(const char *cp)
1298: {
1299: while (!endsym(*cp))
1300: ++cp;
1301: return (cp);
1302: }
1303:
1.1 deraadt 1304: /*
1.16 sthen 1305: * Skip whitespace and take a copy of any following identifier.
1306: */
1307: static const char *
1308: getsym(const char **cpp)
1309: {
1310: const char *cp = *cpp, *sym;
1311:
1312: cp = skipcomment(cp);
1313: cp = skipsym(sym = cp);
1314: if (cp == sym)
1315: return NULL;
1316: *cpp = cp;
1317: return (xstrdup(sym, cp));
1318: }
1319:
1320: /*
1321: * Check that s (a symbol) matches the start of t, and that the
1322: * following character in t is not a symbol character. Returns a
1323: * pointer to the following character in t if there is a match,
1324: * otherwise NULL.
1325: */
1326: static const char *
1327: matchsym(const char *s, const char *t)
1328: {
1329: while (*s != '\0' && *t != '\0')
1330: if (*s != *t)
1331: return (NULL);
1332: else
1333: ++s, ++t;
1334: if (*s == '\0' && endsym(*t))
1335: return(t);
1336: else
1337: return(NULL);
1338: }
1339:
1340: /*
1.13 jmc 1341: * Look for the symbol in the symbol table. If it is found, we return
1.8 deraadt 1342: * the symbol table index, else we return -1.
1.1 deraadt 1343: */
1.8 deraadt 1344: static int
1.16 sthen 1345: findsym(const char **strp)
1.1 deraadt 1346: {
1.16 sthen 1347: const char *str;
1.3 deraadt 1348: int symind;
1349:
1.16 sthen 1350: str = *strp;
1351: *strp = skipsym(str);
1352: if (symlist) {
1353: if (*strp == str)
1354: return (-1);
1355: if (symdepth && firstsym)
1356: printf("%s%3d", zerosyms ? "" : "\n", depth);
1357: firstsym = zerosyms = false;
1358: printf("%s%.*s%s",
1359: symdepth ? " " : "",
1360: (int)(*strp-str), str,
1361: symdepth ? "" : "\n");
1362: /* we don't care about the value of the symbol */
1363: return (0);
1364: }
1.8 deraadt 1365: for (symind = 0; symind < nsyms; ++symind) {
1.16 sthen 1366: if (matchsym(symname[symind], str) != NULL) {
1367: debugsym("findsym", symind);
1.7 deraadt 1368: return (symind);
1.3 deraadt 1369: }
1.1 deraadt 1370: }
1.8 deraadt 1371: return (-1);
1.1 deraadt 1372: }
1.7 deraadt 1373:
1.1 deraadt 1374: /*
1.16 sthen 1375: * Resolve indirect symbol values to their final definitions.
1376: */
1377: static void
1378: indirectsym(void)
1379: {
1380: const char *cp;
1381: int changed, sym, ind;
1382:
1383: do {
1384: changed = 0;
1385: for (sym = 0; sym < nsyms; ++sym) {
1386: if (value[sym] == NULL)
1387: continue;
1388: cp = value[sym];
1389: ind = findsym(&cp);
1390: if (ind == -1 || ind == sym ||
1391: *cp != '\0' ||
1392: value[ind] == NULL ||
1393: value[ind] == value[sym])
1394: continue;
1395: debugsym("indir...", sym);
1396: value[sym] = value[ind];
1397: debugsym("...ectsym", sym);
1398: changed++;
1399: }
1400: } while (changed);
1401: }
1402:
1403: /*
1404: * Add a symbol to the symbol table, specified with the format sym=val
1405: */
1406: static void
1407: addsym1(bool ignorethis, bool definethis, char *symval)
1408: {
1409: const char *sym, *val;
1410:
1411: sym = symval;
1412: val = skipsym(sym);
1413: if (definethis && *val == '=') {
1414: symval[val - sym] = '\0';
1415: val = val + 1;
1416: } else if (*val == '\0') {
1417: val = definethis ? "1" : NULL;
1418: } else {
1419: usage();
1420: }
1421: addsym2(ignorethis, sym, val);
1422: }
1423:
1424: /*
1.7 deraadt 1425: * Add a symbol to the symbol table.
1426: */
1.8 deraadt 1427: static void
1.16 sthen 1428: addsym2(bool ignorethis, const char *sym, const char *val)
1.7 deraadt 1429: {
1.16 sthen 1430: const char *cp = sym;
1.7 deraadt 1431: int symind;
1432:
1.16 sthen 1433: symind = findsym(&cp);
1.8 deraadt 1434: if (symind < 0) {
1.7 deraadt 1435: if (nsyms >= MAXSYMS)
1436: errx(2, "too many symbols");
1437: symind = nsyms++;
1438: }
1.16 sthen 1439: ignore[symind] = ignorethis;
1.7 deraadt 1440: symname[symind] = sym;
1.16 sthen 1441: value[symind] = val;
1442: debugsym("addsym", symind);
1443: }
1444:
1445: static void
1446: debugsym(const char *why, int symind)
1447: {
1448: debug("%s %s%c%s", why, symname[symind],
1449: value[symind] ? '=' : ' ',
1450: value[symind] ? value[symind] : "undef");
1451: }
1452:
1453: /*
1454: * Add symbols to the symbol table from a file containing
1455: * #define and #undef preprocessor directives.
1456: */
1457: static void
1458: defundefile(const char *fn)
1459: {
1460: filename = fn;
1461: input = fopen(fn, "rb");
1462: if (input == NULL)
1463: err(2, "can't open %s", fn);
1464: linenum = 0;
1465: while (defundef())
1466: ;
1467: if (ferror(input))
1468: err(2, "can't read %s", filename);
1469: else
1470: fclose(input);
1471: if (incomment)
1472: error("EOF in comment");
1473: }
1474:
1475: /*
1476: * Read and process one #define or #undef directive
1477: */
1478: static bool
1479: defundef(void)
1480: {
1481: const char *cp, *kw, *sym, *val, *end;
1482:
1483: cp = skiphash();
1484: if (cp == NULL)
1485: return (false);
1486: if (*cp == '\0')
1487: goto done;
1488: /* strip trailing whitespace, and do a fairly rough check to
1489: avoid unsupported multi-line preprocessor directives */
1490: end = cp + strlen(cp);
1491: while (end > tline && strchr(" \t\n\r", end[-1]) != NULL)
1492: --end;
1493: if (end > tline && end[-1] == '\\')
1494: Eioccc();
1495:
1496: kw = cp;
1497: if ((cp = matchsym("define", kw)) != NULL) {
1498: sym = getsym(&cp);
1499: if (sym == NULL)
1.26 mmcc 1500: error("Missing macro name in #define");
1.16 sthen 1501: if (*cp == '(') {
1502: val = "1";
1503: } else {
1504: cp = skipcomment(cp);
1505: val = (cp < end) ? xstrdup(cp, end) : "";
1506: }
1507: debug("#define");
1508: addsym2(false, sym, val);
1509: } else if ((cp = matchsym("undef", kw)) != NULL) {
1510: sym = getsym(&cp);
1511: if (sym == NULL)
1.26 mmcc 1512: error("Missing macro name in #undef");
1.16 sthen 1513: cp = skipcomment(cp);
1514: debug("#undef");
1515: addsym2(false, sym, NULL);
1.7 deraadt 1516: } else {
1.26 mmcc 1517: error("Unrecognized preprocessor directive");
1.7 deraadt 1518: }
1.16 sthen 1519: skipline(cp);
1520: done:
1521: debug("parser line %d state %s comment %s line", linenum,
1522: comment_name[incomment], linestate_name[linestate]);
1523: return (true);
1524: }
1525:
1526: /*
1527: * Concatenate two strings into new memory, checking for failure.
1528: */
1529: static char *
1530: astrcat(const char *s1, const char *s2)
1531: {
1532: char *s;
1533: int len;
1534: size_t size;
1535:
1536: len = snprintf(NULL, 0, "%s%s", s1, s2);
1537: if (len < 0)
1538: err(2, "snprintf");
1539: size = (size_t)len + 1;
1.28 ! mmcc 1540: s = (char *)malloc(size);
1.16 sthen 1541: if (s == NULL)
1542: err(2, "malloc");
1543: snprintf(s, size, "%s%s", s1, s2);
1544: return (s);
1.7 deraadt 1545: }
1546:
1547: /*
1.16 sthen 1548: * Duplicate a segment of a string, checking for failure.
1.1 deraadt 1549: */
1.16 sthen 1550: static const char *
1551: xstrdup(const char *start, const char *end)
1.3 deraadt 1552: {
1.16 sthen 1553: size_t n;
1554: char *s;
1555:
1556: if (end < start) abort(); /* bug */
1557: n = (size_t)(end - start) + 1;
1.28 ! mmcc 1558: s = (char *)malloc(n);
1.16 sthen 1559: if (s == NULL)
1560: err(2, "malloc");
1561: snprintf(s, n, "%s", start);
1562: return (s);
1.1 deraadt 1563: }
1564:
1.7 deraadt 1565: /*
1.8 deraadt 1566: * Diagnostics.
1.7 deraadt 1567: */
1.8 deraadt 1568: static void
1.7 deraadt 1569: debug(const char *msg, ...)
1.1 deraadt 1570: {
1.7 deraadt 1571: va_list ap;
1572:
1573: if (debugging) {
1574: va_start(ap, msg);
1575: vwarnx(msg, ap);
1576: va_end(ap);
1577: }
1.1 deraadt 1578: }
1579:
1.8 deraadt 1580: static void
1581: error(const char *msg)
1.7 deraadt 1582: {
1.8 deraadt 1583: if (depth == 0)
1.9 deraadt 1584: warnx("%s: %d: %s", filename, linenum, msg);
1.7 deraadt 1585: else
1.9 deraadt 1586: warnx("%s: %d: %s (#if line %d depth %d)",
1.8 deraadt 1587: filename, linenum, msg, stifline[depth], depth);
1.16 sthen 1588: closeio();
1.26 mmcc 1589: errx(2, "Output may be truncated");
1.22 deraadt 1590: }
1591:
1592: static FILE *
1593: mktempmode(char *tmp, int mode)
1594: {
1595: int fd = mkstemp(tmp);
1596: if (fd < 0)
1597: return (NULL);
1598: fchmod(fd, mode & (S_IRWXU|S_IRWXG|S_IRWXO));
1599: return (fdopen(fd, "wb"));
1.1 deraadt 1600: }
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