Annotation of src/usr.bin/m4/eval.c, Revision 1.60
1.60 ! espie 1: /* $OpenBSD: eval.c,v 1.59 2006/01/20 23:10:19 espie Exp $ */
1.7 millert 2: /* $NetBSD: eval.c,v 1.7 1996/11/10 21:21:29 pk Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1989, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Ozan Yigit at York University.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.47 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: /*
37: * eval.c
38: * Facility: m4 macro processor
39: * by: oz
40: */
41:
42: #include <sys/types.h>
43: #include <errno.h>
1.56 espie 44: #include <limits.h>
1.1 deraadt 45: #include <unistd.h>
46: #include <stdio.h>
47: #include <stdlib.h>
1.13 espie 48: #include <stddef.h>
1.1 deraadt 49: #include <string.h>
1.6 millert 50: #include <fcntl.h>
1.1 deraadt 51: #include "mdef.h"
52: #include "stdd.h"
53: #include "extern.h"
54: #include "pathnames.h"
55:
1.43 millert 56: static void dodefn(const char *);
57: static void dopushdef(const char *, const char *);
58: static void dodump(const char *[], int);
59: static void dotrace(const char *[], int, int);
60: static void doifelse(const char *[], int);
61: static int doincl(const char *);
62: static int dopaste(const char *);
63: static void dochq(const char *[], int);
64: static void dochc(const char *[], int);
1.55 espie 65: static void dom4wrap(const char *);
1.43 millert 66: static void dodiv(int);
67: static void doundiv(const char *[], int);
68: static void dosub(const char *[], int);
69: static void map(char *, const char *, const char *, const char *);
70: static const char *handledash(char *, char *, const char *);
71: static void expand_builtin(const char *[], int, int);
72: static void expand_macro(const char *[], int);
1.49 espie 73: static void dump_one_def(const char *, struct macro_definition *);
1.30 espie 74:
1.34 espie 75: unsigned long expansion_id;
1.30 espie 76:
1.1 deraadt 77: /*
1.30 espie 78: * eval - eval all macros and builtins calls
1.39 espie 79: * argc - number of elements in argv.
80: * argv - element vector :
81: * argv[0] = definition of a user
1.49 espie 82: * macro or NULL if built-in.
1.39 espie 83: * argv[1] = name of the macro or
84: * built-in.
85: * argv[2] = parameters to user-defined
86: * . macro or built-in.
87: * .
88: *
89: * A call in the form of macro-or-builtin() will result in:
90: * argv[0] = nullstr
91: * argv[1] = macro-or-builtin
92: * argv[2] = nullstr
93: *
94: * argc is 3 for macro-or-builtin() and 2 for macro-or-builtin
1.30 espie 95: */
96: void
1.50 espie 97: eval(const char *argv[], int argc, int td, int is_traced)
1.30 espie 98: {
1.59 espie 99: size_t mark = SIZE_MAX;
1.35 espie 100:
1.34 espie 101: expansion_id++;
1.30 espie 102: if (td & RECDEF)
1.60 ! espie 103: m4errx(1, "expanding recursive definition for %s.", argv[1]);
1.50 espie 104: if (is_traced)
1.35 espie 105: mark = trace(argv, argc, infile+ilevel);
1.30 espie 106: if (td == MACRTYPE)
107: expand_macro(argv, argc);
108: else
109: expand_builtin(argv, argc, td);
1.59 espie 110: if (mark != SIZE_MAX)
1.35 espie 111: finish_trace(mark);
1.30 espie 112: }
113:
114: /*
115: * expand_builtin - evaluate built-in macros.
1.1 deraadt 116: */
117: void
1.44 espie 118: expand_builtin(const char *argv[], int argc, int td)
1.1 deraadt 119: {
1.17 espie 120: int c, n;
1.39 espie 121: int ac;
1.1 deraadt 122: static int sysval = 0;
123:
124: #ifdef DEBUG
125: printf("argc = %d\n", argc);
126: for (n = 0; n < argc; n++)
127: printf("argv[%d] = %s\n", n, argv[n]);
1.42 espie 128: fflush(stdout);
1.1 deraadt 129: #endif
1.22 espie 130:
1.1 deraadt 131: /*
132: * if argc == 3 and argv[2] is null, then we
133: * have macro-or-builtin() type call. We adjust
134: * argc to avoid further checking..
135: */
1.58 espie 136: /* we keep the initial value for those built-ins that differentiate
137: * between builtin() and builtin.
138: */
1.39 espie 139: ac = argc;
140:
1.1 deraadt 141: if (argc == 3 && !*(argv[2]))
142: argc--;
143:
1.22 espie 144: switch (td & TYPEMASK) {
1.1 deraadt 145:
146: case DEFITYPE:
147: if (argc > 2)
148: dodefine(argv[2], (argc > 3) ? argv[3] : null);
149: break;
150:
151: case PUSDTYPE:
152: if (argc > 2)
153: dopushdef(argv[2], (argc > 3) ? argv[3] : null);
154: break;
155:
156: case DUMPTYPE:
157: dodump(argv, argc);
158: break;
159:
1.37 espie 160: case TRACEONTYPE:
161: dotrace(argv, argc, 1);
162: break;
163:
164: case TRACEOFFTYPE:
165: dotrace(argv, argc, 0);
166: break;
167:
1.1 deraadt 168: case EXPRTYPE:
169: /*
170: * doexpr - evaluate arithmetic
171: * expression
172: */
1.56 espie 173: {
174: int base = 10;
175: int maxdigits = 0;
176: const char *errstr;
177:
178: if (argc > 3) {
179: base = strtonum(argv[3], 2, 36, &errstr);
180: if (errstr) {
1.60 ! espie 181: m4errx(1, "expr: base %s invalid.", argv[3]);
1.56 espie 182: }
183: }
184: if (argc > 4) {
185: maxdigits = strtonum(argv[4], 0, INT_MAX, &errstr);
186: if (errstr) {
1.60 ! espie 187: m4errx(1, "expr: maxdigits %s invalid.", argv[4]);
1.56 espie 188: }
189: }
1.1 deraadt 190: if (argc > 2)
1.56 espie 191: pbnumbase(expr(argv[2]), base, maxdigits);
1.1 deraadt 192: break;
1.56 espie 193: }
1.1 deraadt 194:
195: case IFELTYPE:
196: if (argc > 4)
197: doifelse(argv, argc);
198: break;
199:
200: case IFDFTYPE:
201: /*
202: * doifdef - select one of two
203: * alternatives based on the existence of
204: * another definition
205: */
206: if (argc > 3) {
1.49 espie 207: if (lookup_macro_definition(argv[2]) != NULL)
1.1 deraadt 208: pbstr(argv[3]);
209: else if (argc > 4)
210: pbstr(argv[4]);
211: }
212: break;
213:
214: case LENGTYPE:
215: /*
216: * dolen - find the length of the
217: * argument
218: */
1.18 espie 219: pbnum((argc > 2) ? strlen(argv[2]) : 0);
1.1 deraadt 220: break;
221:
222: case INCRTYPE:
223: /*
224: * doincr - increment the value of the
225: * argument
226: */
227: if (argc > 2)
228: pbnum(atoi(argv[2]) + 1);
229: break;
230:
231: case DECRTYPE:
232: /*
233: * dodecr - decrement the value of the
234: * argument
235: */
236: if (argc > 2)
237: pbnum(atoi(argv[2]) - 1);
238: break;
239:
240: case SYSCTYPE:
241: /*
242: * dosys - execute system command
243: */
1.54 robert 244: if (argc > 2) {
245: fflush(stdout);
1.1 deraadt 246: sysval = system(argv[2]);
1.54 robert 247: }
1.1 deraadt 248: break;
249:
250: case SYSVTYPE:
251: /*
252: * dosysval - return value of the last
253: * system call.
254: *
255: */
256: pbnum(sysval);
257: break;
258:
1.27 espie 259: case ESYSCMDTYPE:
260: if (argc > 2)
261: doesyscmd(argv[2]);
262: break;
1.1 deraadt 263: case INCLTYPE:
264: if (argc > 2)
265: if (!doincl(argv[2]))
1.24 espie 266: err(1, "%s at line %lu: include(%s)",
267: CURRENT_NAME, CURRENT_LINE, argv[2]);
1.1 deraadt 268: break;
269:
270: case SINCTYPE:
271: if (argc > 2)
272: (void) doincl(argv[2]);
273: break;
274: #ifdef EXTENDED
275: case PASTTYPE:
276: if (argc > 2)
277: if (!dopaste(argv[2]))
1.24 espie 278: err(1, "%s at line %lu: paste(%s)",
279: CURRENT_NAME, CURRENT_LINE, argv[2]);
1.1 deraadt 280: break;
281:
282: case SPASTYPE:
283: if (argc > 2)
284: (void) dopaste(argv[2]);
285: break;
286: #endif
287: case CHNQTYPE:
1.58 espie 288: dochq(argv, ac);
1.1 deraadt 289: break;
290:
291: case CHNCTYPE:
1.58 espie 292: dochc(argv, argc);
1.1 deraadt 293: break;
294:
295: case SUBSTYPE:
296: /*
297: * dosub - select substring
298: *
299: */
300: if (argc > 3)
301: dosub(argv, argc);
302: break;
303:
304: case SHIFTYPE:
305: /*
306: * doshift - push back all arguments
307: * except the first one (i.e. skip
308: * argv[2])
309: */
310: if (argc > 3) {
311: for (n = argc - 1; n > 3; n--) {
1.10 deraadt 312: pbstr(rquote);
1.1 deraadt 313: pbstr(argv[n]);
1.10 deraadt 314: pbstr(lquote);
1.58 espie 315: pushback(COMMA);
1.1 deraadt 316: }
1.10 deraadt 317: pbstr(rquote);
1.1 deraadt 318: pbstr(argv[3]);
1.10 deraadt 319: pbstr(lquote);
1.1 deraadt 320: }
321: break;
322:
323: case DIVRTYPE:
324: if (argc > 2 && (n = atoi(argv[2])) != 0)
325: dodiv(n);
326: else {
327: active = stdout;
328: oindex = 0;
329: }
330: break;
331:
332: case UNDVTYPE:
333: doundiv(argv, argc);
334: break;
335:
336: case DIVNTYPE:
337: /*
338: * dodivnum - return the number of
339: * current output diversion
340: */
341: pbnum(oindex);
342: break;
343:
344: case UNDFTYPE:
345: /*
346: * doundefine - undefine a previously
347: * defined macro(s) or m4 keyword(s).
348: */
349: if (argc > 2)
350: for (n = 2; n < argc; n++)
1.49 espie 351: macro_undefine(argv[n]);
1.1 deraadt 352: break;
353:
354: case POPDTYPE:
355: /*
356: * dopopdef - remove the topmost
357: * definitions of macro(s) or m4
358: * keyword(s).
359: */
360: if (argc > 2)
361: for (n = 2; n < argc; n++)
1.49 espie 362: macro_popdef(argv[n]);
1.1 deraadt 363: break;
364:
365: case MKTMTYPE:
366: /*
367: * dotemp - create a temporary file
368: */
1.16 espie 369: if (argc > 2) {
370: int fd;
1.20 espie 371: char *temp;
372:
373: temp = xstrdup(argv[2]);
1.16 espie 374:
1.20 espie 375: fd = mkstemp(temp);
1.16 espie 376: if (fd == -1)
1.24 espie 377: err(1,
378: "%s at line %lu: couldn't make temp file %s",
379: CURRENT_NAME, CURRENT_LINE, argv[2]);
1.16 espie 380: close(fd);
1.20 espie 381: pbstr(temp);
382: free(temp);
1.16 espie 383: }
1.1 deraadt 384: break;
385:
386: case TRNLTYPE:
387: /*
388: * dotranslit - replace all characters in
389: * the source string that appears in the
390: * "from" string with the corresponding
391: * characters in the "to" string.
392: */
393: if (argc > 3) {
1.42 espie 394: char *temp;
395:
1.51 espie 396: temp = xalloc(strlen(argv[2])+1, NULL);
1.1 deraadt 397: if (argc > 4)
398: map(temp, argv[2], argv[3], argv[4]);
399: else
400: map(temp, argv[2], argv[3], null);
401: pbstr(temp);
1.42 espie 402: free(temp);
1.8 deraadt 403: } else if (argc > 2)
1.1 deraadt 404: pbstr(argv[2]);
405: break;
406:
407: case INDXTYPE:
408: /*
409: * doindex - find the index of the second
410: * argument string in the first argument
411: * string. -1 if not present.
412: */
413: pbnum((argc > 3) ? indx(argv[2], argv[3]) : -1);
414: break;
415:
416: case ERRPTYPE:
417: /*
418: * doerrp - print the arguments to stderr
419: * file
420: */
421: if (argc > 2) {
422: for (n = 2; n < argc; n++)
423: fprintf(stderr, "%s ", argv[n]);
424: fprintf(stderr, "\n");
425: }
426: break;
427:
428: case DNLNTYPE:
429: /*
430: * dodnl - eat-up-to and including
431: * newline
432: */
433: while ((c = gpbc()) != '\n' && c != EOF)
434: ;
435: break;
436:
437: case M4WRTYPE:
438: /*
439: * dom4wrap - set up for
440: * wrap-up/wind-down activity
441: */
1.55 espie 442: if (argc > 2)
443: dom4wrap(argv[2]);
1.1 deraadt 444: break;
445:
446: case EXITTYPE:
447: /*
448: * doexit - immediate exit from m4.
449: */
450: killdiv();
451: exit((argc > 2) ? atoi(argv[2]) : 0);
452: break;
453:
454: case DEFNTYPE:
455: if (argc > 2)
456: for (n = 2; n < argc; n++)
457: dodefn(argv[n]);
458: break;
459:
1.25 espie 460: case INDIRTYPE: /* Indirect call */
461: if (argc > 2)
462: doindir(argv, argc);
463: break;
464:
465: case BUILTINTYPE: /* Builtins only */
466: if (argc > 2)
467: dobuiltin(argv, argc);
468: break;
469:
470: case PATSTYPE:
471: if (argc > 2)
472: dopatsubst(argv, argc);
473: break;
474: case REGEXPTYPE:
475: if (argc > 2)
476: doregexp(argv, argc);
477: break;
478: case LINETYPE:
479: doprintlineno(infile+ilevel);
480: break;
481: case FILENAMETYPE:
482: doprintfilename(infile+ilevel);
483: break;
1.23 espie 484: case SELFTYPE:
485: pbstr(rquote);
486: pbstr(argv[1]);
487: pbstr(lquote);
488: break;
1.1 deraadt 489: default:
1.60 ! espie 490: m4errx(1, "eval: major botch.");
1.1 deraadt 491: break;
492: }
493: }
494:
495: /*
1.30 espie 496: * expand_macro - user-defined macro expansion
1.1 deraadt 497: */
498: void
1.44 espie 499: expand_macro(const char *argv[], int argc)
1.1 deraadt 500: {
1.20 espie 501: const char *t;
502: const char *p;
1.17 espie 503: int n;
504: int argno;
1.1 deraadt 505:
506: t = argv[0]; /* defn string as a whole */
507: p = t;
508: while (*p)
509: p++;
510: p--; /* last character of defn */
511: while (p > t) {
512: if (*(p - 1) != ARGFLAG)
1.58 espie 513: PUSHBACK(*p);
1.1 deraadt 514: else {
515: switch (*p) {
516:
517: case '#':
518: pbnum(argc - 2);
519: break;
520: case '0':
521: case '1':
522: case '2':
523: case '3':
524: case '4':
525: case '5':
526: case '6':
527: case '7':
528: case '8':
529: case '9':
530: if ((argno = *p - '0') < argc - 1)
531: pbstr(argv[argno + 1]);
532: break;
533: case '*':
1.41 espie 534: if (argc > 2) {
535: for (n = argc - 1; n > 2; n--) {
536: pbstr(argv[n]);
1.58 espie 537: pushback(COMMA);
1.41 espie 538: }
539: pbstr(argv[2]);
540: }
1.1 deraadt 541: break;
1.7 millert 542: case '@':
1.41 espie 543: if (argc > 2) {
544: for (n = argc - 1; n > 2; n--) {
545: pbstr(rquote);
546: pbstr(argv[n]);
547: pbstr(lquote);
1.58 espie 548: pushback(COMMA);
1.41 espie 549: }
550: pbstr(rquote);
551: pbstr(argv[2]);
552: pbstr(lquote);
553: }
1.7 millert 554: break;
1.1 deraadt 555: default:
1.58 espie 556: PUSHBACK(*p);
557: PUSHBACK('$');
1.1 deraadt 558: break;
559: }
560: p--;
561: }
562: p--;
563: }
564: if (p == t) /* do last character */
1.58 espie 565: PUSHBACK(*p);
1.1 deraadt 566: }
567:
1.48 espie 568:
1.1 deraadt 569: /*
1.48 espie 570: * dodefine - install definition in the table
571: */
572: void
573: dodefine(const char *name, const char *defn)
574: {
575: if (!*name)
1.60 ! espie 576: m4errx(1, "null definition.");
1.49 espie 577: macro_define(name, defn);
1.1 deraadt 578: }
579:
580: /*
581: * dodefn - push back a quoted definition of
582: * the given name.
583: */
1.20 espie 584: static void
1.44 espie 585: dodefn(const char *name)
1.1 deraadt 586: {
1.49 espie 587: struct macro_definition *p;
1.1 deraadt 588:
1.49 espie 589: if ((p = lookup_macro_definition(name)) != NULL) {
1.48 espie 590: if ((p->type & TYPEMASK) == MACRTYPE) {
1.40 espie 591: pbstr(rquote);
592: pbstr(p->defn);
593: pbstr(lquote);
1.48 espie 594: } else {
595: pbstr(p->defn);
1.31 espie 596: pbstr(BUILTIN_MARKER);
597: }
1.1 deraadt 598: }
599: }
600:
601: /*
602: * dopushdef - install a definition in the hash table
603: * without removing a previous definition. Since
604: * each new entry is entered in *front* of the
605: * hash bucket, it hides a previous definition from
606: * lookup.
607: */
1.20 espie 608: static void
1.44 espie 609: dopushdef(const char *name, const char *defn)
1.1 deraadt 610: {
611: if (!*name)
1.60 ! espie 612: m4errx(1, "null definition.");
1.49 espie 613: macro_pushdef(name, defn);
1.1 deraadt 614: }
615:
616: /*
1.32 espie 617: * dump_one_def - dump the specified definition.
618: */
619: static void
1.49 espie 620: dump_one_def(const char *name, struct macro_definition *p)
1.32 espie 621: {
1.53 espie 622: if (!traceout)
623: traceout = stderr;
1.33 espie 624: if (mimic_gnu) {
625: if ((p->type & TYPEMASK) == MACRTYPE)
1.49 espie 626: fprintf(traceout, "%s:\t%s\n", name, p->defn);
1.33 espie 627: else {
1.49 espie 628: fprintf(traceout, "%s:\t<%s>\n", name, p->defn);
1.33 espie 629: }
630: } else
1.49 espie 631: fprintf(traceout, "`%s'\t`%s'\n", name, p->defn);
1.32 espie 632: }
633:
634: /*
1.1 deraadt 635: * dodumpdef - dump the specified definitions in the hash
636: * table to stderr. If nothing is specified, the entire
637: * hash table is dumped.
638: */
1.20 espie 639: static void
1.44 espie 640: dodump(const char *argv[], int argc)
1.1 deraadt 641: {
1.17 espie 642: int n;
1.49 espie 643: struct macro_definition *p;
1.1 deraadt 644:
645: if (argc > 2) {
646: for (n = 2; n < argc; n++)
1.49 espie 647: if ((p = lookup_macro_definition(argv[n])) != NULL)
648: dump_one_def(argv[n], p);
649: } else
650: macro_for_all(dump_one_def);
1.37 espie 651: }
652:
653: /*
654: * dotrace - mark some macros as traced/untraced depending upon on.
655: */
656: static void
1.44 espie 657: dotrace(const char *argv[], int argc, int on)
1.37 espie 658: {
659: int n;
660:
661: if (argc > 2) {
662: for (n = 2; n < argc; n++)
663: mark_traced(argv[n], on);
664: } else
665: mark_traced(NULL, on);
1.1 deraadt 666: }
667:
668: /*
669: * doifelse - select one of two alternatives - loop.
670: */
1.20 espie 671: static void
1.44 espie 672: doifelse(const char *argv[], int argc)
1.1 deraadt 673: {
674: cycle {
675: if (STREQ(argv[2], argv[3]))
676: pbstr(argv[4]);
677: else if (argc == 6)
678: pbstr(argv[5]);
679: else if (argc > 6) {
680: argv += 3;
681: argc -= 3;
682: continue;
683: }
684: break;
685: }
686: }
687:
688: /*
689: * doinclude - include a given file.
690: */
1.20 espie 691: static int
1.44 espie 692: doincl(const char *ifile)
1.1 deraadt 693: {
694: if (ilevel + 1 == MAXINP)
1.60 ! espie 695: m4errx(1, "too many include files.");
1.24 espie 696: if (fopen_trypath(infile+ilevel+1, ifile) != NULL) {
1.1 deraadt 697: ilevel++;
698: bbase[ilevel] = bufbase = bp;
699: return (1);
1.8 deraadt 700: } else
1.1 deraadt 701: return (0);
702: }
703:
704: #ifdef EXTENDED
705: /*
706: * dopaste - include a given file without any
707: * macro processing.
708: */
1.20 espie 709: static int
1.44 espie 710: dopaste(const char *pfile)
1.1 deraadt 711: {
712: FILE *pf;
1.17 espie 713: int c;
1.1 deraadt 714:
715: if ((pf = fopen(pfile, "r")) != NULL) {
1.45 espie 716: if (synch_lines)
717: fprintf(active, "#line 1 \"%s\"\n", pfile);
1.1 deraadt 718: while ((c = getc(pf)) != EOF)
719: putc(c, active);
720: (void) fclose(pf);
1.45 espie 721: emit_synchline();
1.1 deraadt 722: return (1);
1.8 deraadt 723: } else
1.1 deraadt 724: return (0);
725: }
726: #endif
727:
1.58 espie 728: /*
729: * dochq - change quote characters
730: */
1.39 espie 731: static void
1.58 espie 732: dochq(const char *argv[], int ac)
1.39 espie 733: {
734: if (ac == 2) {
1.58 espie 735: lquote[0] = LQUOTE; lquote[1] = EOS;
736: rquote[0] = RQUOTE; rquote[1] = EOS;
1.39 espie 737: } else {
738: strlcpy(lquote, argv[2], sizeof(lquote));
1.58 espie 739: if (ac > 3) {
1.39 espie 740: strlcpy(rquote, argv[3], sizeof(rquote));
1.58 espie 741: } else {
742: rquote[0] = ECOMMT; rquote[1] = EOS;
743: }
1.39 espie 744: }
745: }
746:
1.1 deraadt 747: /*
1.58 espie 748: * dochc - change comment characters
1.1 deraadt 749: */
1.20 espie 750: static void
1.58 espie 751: dochc(const char *argv[], int argc)
1.1 deraadt 752: {
1.58 espie 753: /* XXX Note that there is no difference between no argument and a single
754: * empty argument.
755: */
756: if (argc == 2) {
1.39 espie 757: scommt[0] = EOS;
758: ecommt[0] = EOS;
759: } else {
1.58 espie 760: strlcpy(scommt, argv[2], sizeof(scommt));
761: if (argc == 3) {
762: ecommt[0] = ECOMMT; ecommt[1] = EOS;
763: } else {
1.39 espie 764: strlcpy(ecommt, argv[3], sizeof(ecommt));
1.1 deraadt 765: }
766: }
1.55 espie 767: }
768:
769: /*
770: * dom4wrap - expand text at EOF
771: */
772: static void
773: dom4wrap(const char *text)
774: {
775: if (wrapindex >= maxwraps) {
776: if (maxwraps == 0)
777: maxwraps = 16;
778: else
779: maxwraps *= 2;
780: m4wraps = xrealloc(m4wraps, maxwraps * sizeof(*m4wraps),
781: "too many m4wraps");
782: }
783: m4wraps[wrapindex++] = xstrdup(text);
1.1 deraadt 784: }
785:
786: /*
787: * dodivert - divert the output to a temporary file
788: */
1.20 espie 789: static void
1.44 espie 790: dodiv(int n)
1.1 deraadt 791: {
1.6 millert 792: int fd;
793:
1.8 deraadt 794: oindex = n;
1.28 espie 795: if (n >= maxout) {
796: if (mimic_gnu)
797: resizedivs(n + 10);
798: else
799: n = 0; /* bitbucket */
800: }
801:
802: if (n < 0)
1.1 deraadt 803: n = 0; /* bitbucket */
804: if (outfile[n] == NULL) {
1.13 espie 805: char fname[] = _PATH_DIVNAME;
806:
807: if ((fd = mkstemp(fname)) < 0 ||
808: (outfile[n] = fdopen(fd, "w+")) == NULL)
809: err(1, "%s: cannot divert", fname);
810: if (unlink(fname) == -1)
811: err(1, "%s: cannot unlink", fname);
1.1 deraadt 812: }
813: active = outfile[n];
814: }
815:
816: /*
817: * doundivert - undivert a specified output, or all
818: * other outputs, in numerical order.
819: */
1.20 espie 820: static void
1.44 espie 821: doundiv(const char *argv[], int argc)
1.1 deraadt 822: {
1.17 espie 823: int ind;
824: int n;
1.1 deraadt 825:
826: if (argc > 2) {
827: for (ind = 2; ind < argc; ind++) {
1.56 espie 828: const char *errstr;
829: n = strtonum(argv[ind], 1, INT_MAX, &errstr);
830: if (errstr) {
831: if (errno == EINVAL && mimic_gnu)
832: getdivfile(argv[ind]);
833: } else {
834: if (n < maxout && outfile[n] != NULL)
835: getdiv(n);
836: }
1.1 deraadt 837: }
838: }
839: else
1.28 espie 840: for (n = 1; n < maxout; n++)
1.1 deraadt 841: if (outfile[n] != NULL)
842: getdiv(n);
843: }
844:
845: /*
846: * dosub - select substring
847: */
1.20 espie 848: static void
1.44 espie 849: dosub(const char *argv[], int argc)
1.1 deraadt 850: {
1.20 espie 851: const char *ap, *fc, *k;
1.17 espie 852: int nc;
1.1 deraadt 853:
1.29 espie 854: ap = argv[2]; /* target string */
1.1 deraadt 855: #ifdef EXPR
1.29 espie 856: fc = ap + expr(argv[3]); /* first char */
1.1 deraadt 857: #else
1.29 espie 858: fc = ap + atoi(argv[3]); /* first char */
1.1 deraadt 859: #endif
1.29 espie 860: nc = strlen(fc);
861: if (argc >= 5)
1.1 deraadt 862: #ifdef EXPR
1.29 espie 863: nc = min(nc, expr(argv[4]));
1.1 deraadt 864: #else
1.29 espie 865: nc = min(nc, atoi(argv[4]));
1.1 deraadt 866: #endif
867: if (fc >= ap && fc < ap + strlen(ap))
1.29 espie 868: for (k = fc + nc - 1; k >= fc; k--)
1.58 espie 869: pushback(*k);
1.1 deraadt 870: }
871:
872: /*
873: * map:
874: * map every character of s1 that is specified in from
875: * into s3 and replace in s. (source s1 remains untouched)
876: *
877: * This is a standard implementation of map(s,from,to) function of ICON
878: * language. Within mapvec, we replace every character of "from" with
879: * the corresponding character in "to". If "to" is shorter than "from",
880: * than the corresponding entries are null, which means that those
881: * characters dissapear altogether. Furthermore, imagine
882: * map(dest, "sourcestring", "srtin", "rn..*") type call. In this case,
883: * `s' maps to `r', `r' maps to `n' and `n' maps to `*'. Thus, `s'
884: * ultimately maps to `*'. In order to achieve this effect in an efficient
885: * manner (i.e. without multiple passes over the destination string), we
886: * loop over mapvec, starting with the initial source character. if the
887: * character value (dch) in this location is different than the source
888: * character (sch), sch becomes dch, once again to index into mapvec, until
889: * the character value stabilizes (i.e. sch = dch, in other words
890: * mapvec[n] == n). Even if the entry in the mapvec is null for an ordinary
891: * character, it will stabilize, since mapvec[0] == 0 at all times. At the
892: * end, we restore mapvec* back to normal where mapvec[n] == n for
893: * 0 <= n <= 127. This strategy, along with the restoration of mapvec, is
894: * about 5 times faster than any algorithm that makes multiple passes over
895: * destination string.
896: */
1.20 espie 897: static void
1.44 espie 898: map(char *dest, const char *src, const char *from, const char *to)
1.1 deraadt 899: {
1.20 espie 900: const char *tmp;
1.19 espie 901: unsigned char sch, dch;
1.26 espie 902: static char frombis[257];
903: static char tobis[257];
1.19 espie 904: static unsigned char mapvec[256] = {
905: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
906: 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
907: 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
908: 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69,
909: 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86,
910: 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102,
911: 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115,
912: 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128,
913: 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141,
914: 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154,
915: 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167,
916: 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180,
917: 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193,
918: 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206,
919: 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
920: 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232,
921: 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245,
922: 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
1.1 deraadt 923: };
924:
925: if (*src) {
1.26 espie 926: if (mimic_gnu) {
927: /*
928: * expand character ranges on the fly
929: */
930: from = handledash(frombis, frombis + 256, from);
931: to = handledash(tobis, tobis + 256, to);
932: }
1.1 deraadt 933: tmp = from;
934: /*
935: * create a mapping between "from" and
936: * "to"
937: */
938: while (*from)
1.19 espie 939: mapvec[(unsigned char)(*from++)] = (*to) ?
940: (unsigned char)(*to++) : 0;
1.1 deraadt 941:
942: while (*src) {
1.19 espie 943: sch = (unsigned char)(*src++);
1.1 deraadt 944: dch = mapvec[sch];
945: while (dch != sch) {
946: sch = dch;
947: dch = mapvec[sch];
948: }
1.19 espie 949: if ((*dest = (char)dch))
1.1 deraadt 950: dest++;
951: }
952: /*
953: * restore all the changed characters
954: */
955: while (*tmp) {
1.19 espie 956: mapvec[(unsigned char)(*tmp)] = (unsigned char)(*tmp);
1.1 deraadt 957: tmp++;
958: }
959: }
1.19 espie 960: *dest = '\0';
1.1 deraadt 961: }
1.26 espie 962:
963:
964: /*
965: * handledash:
966: * use buffer to copy the src string, expanding character ranges
967: * on the way.
968: */
969: static const char *
1.44 espie 970: handledash(char *buffer, char *end, const char *src)
1.26 espie 971: {
972: char *p;
973:
974: p = buffer;
975: while(*src) {
976: if (src[1] == '-' && src[2]) {
977: unsigned char i;
1.56 espie 978: if ((unsigned char)src[0] <= (unsigned char)src[2]) {
979: for (i = (unsigned char)src[0];
980: i <= (unsigned char)src[2]; i++) {
981: *p++ = i;
982: if (p == end) {
983: *p = '\0';
984: return buffer;
985: }
986: }
987: } else {
988: for (i = (unsigned char)src[0];
989: i >= (unsigned char)src[2]; i--) {
990: *p++ = i;
991: if (p == end) {
992: *p = '\0';
993: return buffer;
994: }
1.26 espie 995: }
996: }
997: src += 3;
998: } else
999: *p++ = *src++;
1000: if (p == end)
1001: break;
1002: }
1003: *p = '\0';
1004: return buffer;
1005: }
![[BACK]](/icons/back.gif){kind=icon}
Return to eval.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / m4