Annotation of src/usr.bin/m4/gnum4.c, Revision 1.51
1.51 ! bcallah 1: /* $OpenBSD: gnum4.c,v 1.50 2015/04/29 00:13:26 millert Exp $ */
1.1 espie 2:
3: /*
4: * Copyright (c) 1999 Marc Espie
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
16: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25: * SUCH DAMAGE.
26: */
27:
1.41 marco 28: /*
1.1 espie 29: * functions needed to support gnu-m4 extensions, including a fake freezing
30: */
31:
1.5 espie 32: #include <sys/types.h>
1.8 espie 33: #include <sys/wait.h>
1.5 espie 34: #include <ctype.h>
1.36 espie 35: #include <err.h>
1.8 espie 36: #include <paths.h>
1.5 espie 37: #include <regex.h>
1.51 ! bcallah 38: #include <stdarg.h>
1.1 espie 39: #include <stddef.h>
40: #include <stdlib.h>
1.50 millert 41: #include <stdint.h>
1.1 espie 42: #include <stdio.h>
43: #include <string.h>
1.8 espie 44: #include <errno.h>
45: #include <unistd.h>
1.47 deraadt 46: #include <limits.h>
1.1 espie 47: #include "mdef.h"
48: #include "stdd.h"
49: #include "extern.h"
50:
1.5 espie 51:
52: int mimic_gnu = 0;
53:
1.1 espie 54: /*
55: * Support for include path search
1.27 espie 56: * First search in the current directory.
1.1 espie 57: * If not found, and the path is not absolute, include path kicks in.
58: * First, -I options, in the order found on the command line.
59: * Then M4PATH env variable
60: */
61:
62: struct path_entry {
63: char *name;
64: struct path_entry *next;
65: } *first, *last;
66:
1.16 millert 67: static struct path_entry *new_path_entry(const char *);
68: static void ensure_m4path(void);
69: static struct input_file *dopath(struct input_file *, const char *);
1.3 espie 70:
1.1 espie 71: static struct path_entry *
1.18 espie 72: new_path_entry(const char *dirname)
1.1 espie 73: {
74: struct path_entry *n;
75:
76: n = malloc(sizeof(struct path_entry));
77: if (!n)
78: errx(1, "out of memory");
1.48 millert 79: n->name = xstrdup(dirname);
1.1 espie 80: n->next = 0;
81: return n;
82: }
1.41 marco 83:
84: void
1.18 espie 85: addtoincludepath(const char *dirname)
1.1 espie 86: {
87: struct path_entry *n;
88:
89: n = new_path_entry(dirname);
90:
91: if (last) {
92: last->next = n;
93: last = n;
94: }
95: else
96: last = first = n;
97: }
98:
99: static void
100: ensure_m4path()
101: {
102: static int envpathdone = 0;
103: char *envpath;
104: char *sweep;
105: char *path;
106:
107: if (envpathdone)
108: return;
109: envpathdone = TRUE;
110: envpath = getenv("M4PATH");
1.41 marco 111: if (!envpath)
1.1 espie 112: return;
113: /* for portability: getenv result is read-only */
1.48 millert 114: envpath = xstrdup(envpath);
1.41 marco 115: for (sweep = envpath;
1.1 espie 116: (path = strsep(&sweep, ":")) != NULL;)
117: addtoincludepath(path);
118: free(envpath);
119: }
120:
121: static
1.4 espie 122: struct input_file *
1.18 espie 123: dopath(struct input_file *i, const char *filename)
1.1 espie 124: {
1.47 deraadt 125: char path[PATH_MAX];
1.1 espie 126: struct path_entry *pe;
1.4 espie 127: FILE *f;
1.1 espie 128:
129: for (pe = first; pe; pe = pe->next) {
130: snprintf(path, sizeof(path), "%s/%s", pe->name, filename);
1.4 espie 131: if ((f = fopen(path, "r")) != 0) {
132: set_input(i, f, path);
133: return i;
134: }
1.1 espie 135: }
136: return NULL;
137: }
138:
1.4 espie 139: struct input_file *
1.18 espie 140: fopen_trypath(struct input_file *i, const char *filename)
1.1 espie 141: {
142: FILE *f;
143:
144: f = fopen(filename, "r");
1.4 espie 145: if (f != NULL) {
146: set_input(i, f, filename);
147: return i;
148: }
1.1 espie 149: if (filename[0] == '/')
150: return NULL;
151:
152: ensure_m4path();
153:
1.4 espie 154: return dopath(i, filename);
1.1 espie 155: }
156:
1.41 marco 157: void
1.18 espie 158: doindir(const char *argv[], int argc)
1.5 espie 159: {
1.25 espie 160: ndptr n;
1.22 espie 161: struct macro_definition *p;
1.5 espie 162:
1.25 espie 163: n = lookup(argv[2]);
164: if (n == NULL || (p = macro_getdef(n)) == NULL)
1.32 espie 165: m4errx(1, "indir: undefined macro %s.", argv[2]);
1.5 espie 166: argv[1] = p->defn;
1.41 marco 167:
1.25 espie 168: eval(argv+1, argc-1, p->type, is_traced(n));
1.5 espie 169: }
170:
1.41 marco 171: void
1.18 espie 172: dobuiltin(const char *argv[], int argc)
1.5 espie 173: {
1.24 espie 174: ndptr p;
1.25 espie 175:
1.5 espie 176: argv[1] = NULL;
1.24 espie 177: p = macro_getbuiltin(argv[2]);
178: if (p != NULL)
1.25 espie 179: eval(argv+1, argc-1, macro_builtin_type(p), is_traced(p));
1.5 espie 180: else
1.32 espie 181: m4errx(1, "unknown builtin %s.", argv[2]);
1.41 marco 182: }
1.5 espie 183:
184:
185: /* We need some temporary buffer space, as pb pushes BACK and substitution
186: * proceeds forward... */
187: static char *buffer;
188: static size_t bufsize = 0;
189: static size_t current = 0;
190:
1.16 millert 191: static void addchars(const char *, size_t);
1.17 espie 192: static void addchar(int);
1.16 millert 193: static char *twiddle(const char *);
194: static char *getstring(void);
1.46 espie 195: static void exit_regerror(int, regex_t *, const char *);
196: static void do_subst(const char *, regex_t *, const char *, const char *,
197: regmatch_t *);
198: static void do_regexpindex(const char *, regex_t *, const char *, regmatch_t *);
199: static void do_regexp(const char *, regex_t *, const char *, const char *,
200: regmatch_t *);
1.16 millert 201: static void add_sub(int, const char *, regex_t *, regmatch_t *);
202: static void add_replace(const char *, regex_t *, const char *, regmatch_t *);
1.14 espie 203: #define addconstantstring(s) addchars((s), sizeof(s)-1)
1.5 espie 204:
1.41 marco 205: static void
1.18 espie 206: addchars(const char *c, size_t n)
1.5 espie 207: {
208: if (n == 0)
209: return;
1.15 espie 210: while (current + n > bufsize) {
1.5 espie 211: if (bufsize == 0)
212: bufsize = 1024;
1.49 espie 213: else if (bufsize <= SIZE_MAX/2) {
1.5 espie 214: bufsize *= 2;
1.49 espie 215: } else {
216: errx(1, "size overflow");
217: }
1.26 espie 218: buffer = xrealloc(buffer, bufsize, NULL);
1.5 espie 219: }
220: memcpy(buffer+current, c, n);
221: current += n;
222: }
223:
1.41 marco 224: static void
1.18 espie 225: addchar(int c)
1.5 espie 226: {
227: if (current +1 > bufsize) {
228: if (bufsize == 0)
229: bufsize = 1024;
230: else
231: bufsize *= 2;
1.26 espie 232: buffer = xrealloc(buffer, bufsize, NULL);
1.5 espie 233: }
234: buffer[current++] = c;
235: }
236:
237: static char *
1.51 ! bcallah 238: getstring(void)
1.5 espie 239: {
240: addchar('\0');
241: current = 0;
242: return buffer;
243: }
244:
245:
1.41 marco 246: static void
1.46 espie 247: exit_regerror(int er, regex_t *re, const char *source)
1.5 espie 248: {
1.41 marco 249: size_t errlen;
250: char *errbuf;
1.5 espie 251:
252: errlen = regerror(er, re, NULL, 0);
1.41 marco 253: errbuf = xalloc(errlen,
1.26 espie 254: "malloc in regerror: %lu", (unsigned long)errlen);
1.5 espie 255: regerror(er, re, errbuf, errlen);
1.46 espie 256: m4errx(1, "regular expression error in %s: %s.", source, errbuf);
1.5 espie 257: }
258:
1.51 ! bcallah 259: /* warnx() plus check to see if we need to change exit code or exit.
! 260: * -E flag functionality.
! 261: */
! 262: void
! 263: m4_warnx(const char *fmt, ...)
! 264: {
! 265: va_list ap;
! 266:
! 267: va_start(ap, fmt);
! 268: vwarnx(fmt, ap);
! 269: va_end(ap);
! 270:
! 271: if (fatal_warns)
! 272: exit(1);
! 273: if (error_warns)
! 274: exit_code = 1;
! 275: }
! 276:
1.5 espie 277: static void
1.18 espie 278: add_sub(int n, const char *string, regex_t *re, regmatch_t *pm)
1.5 espie 279: {
280: if (n > re->re_nsub)
1.51 ! bcallah 281: m4_warnx("No subexpression %d", n);
1.5 espie 282: /* Subexpressions that did not match are
283: * not an error. */
284: else if (pm[n].rm_so != -1 &&
285: pm[n].rm_eo != -1) {
286: addchars(string + pm[n].rm_so,
287: pm[n].rm_eo - pm[n].rm_so);
288: }
289: }
290:
291: /* Add replacement string to the output buffer, recognizing special
292: * constructs and replacing them with substrings of the original string.
293: */
1.41 marco 294: static void
1.18 espie 295: add_replace(const char *string, regex_t *re, const char *replace, regmatch_t *pm)
1.5 espie 296: {
297: const char *p;
298:
299: for (p = replace; *p != '\0'; p++) {
300: if (*p == '&' && !mimic_gnu) {
301: add_sub(0, string, re, pm);
302: continue;
303: }
304: if (*p == '\\') {
305: if (p[1] == '\\') {
306: addchar(p[1]);
1.10 espie 307: p++;
1.5 espie 308: continue;
309: }
310: if (p[1] == '&') {
311: if (mimic_gnu)
312: add_sub(0, string, re, pm);
313: else
314: addchar(p[1]);
315: p++;
316: continue;
317: }
1.43 deraadt 318: if (isdigit((unsigned char)p[1])) {
1.5 espie 319: add_sub(*(++p) - '0', string, re, pm);
320: continue;
321: }
322: }
1.41 marco 323: addchar(*p);
1.5 espie 324: }
325: }
326:
1.41 marco 327: static void
1.46 espie 328: do_subst(const char *string, regex_t *re, const char *source,
329: const char *replace, regmatch_t *pm)
1.5 espie 330: {
331: int error;
1.11 espie 332: int flags = 0;
333: const char *last_match = NULL;
1.5 espie 334:
1.11 espie 335: while ((error = regexec(re, string, re->re_nsub+1, pm, flags)) == 0) {
1.13 espie 336: if (pm[0].rm_eo != 0) {
337: if (string[pm[0].rm_eo-1] == '\n')
338: flags = 0;
339: else
340: flags = REG_NOTBOL;
341: }
1.5 espie 342:
1.41 marco 343: /* NULL length matches are special... We use the `vi-mode'
1.5 espie 344: * rule: don't allow a NULL-match at the last match
1.41 marco 345: * position.
1.5 espie 346: */
1.41 marco 347: if (pm[0].rm_so == pm[0].rm_eo &&
1.11 espie 348: string + pm[0].rm_so == last_match) {
1.5 espie 349: if (*string == '\0')
350: return;
351: addchar(*string);
1.13 espie 352: if (*string++ == '\n')
353: flags = 0;
354: else
355: flags = REG_NOTBOL;
1.5 espie 356: continue;
357: }
1.11 espie 358: last_match = string + pm[0].rm_so;
359: addchars(string, pm[0].rm_so);
1.5 espie 360: add_replace(string, re, replace, pm);
361: string += pm[0].rm_eo;
362: }
363: if (error != REG_NOMATCH)
1.46 espie 364: exit_regerror(error, re, source);
1.5 espie 365: pbstr(string);
366: }
367:
1.41 marco 368: static void
1.46 espie 369: do_regexp(const char *string, regex_t *re, const char *source,
370: const char *replace, regmatch_t *pm)
1.5 espie 371: {
372: int error;
373:
374: switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
1.41 marco 375: case 0:
1.5 espie 376: add_replace(string, re, replace, pm);
377: pbstr(getstring());
378: break;
379: case REG_NOMATCH:
380: break;
381: default:
1.46 espie 382: exit_regerror(error, re, source);
1.5 espie 383: }
384: }
385:
1.41 marco 386: static void
1.46 espie 387: do_regexpindex(const char *string, regex_t *re, const char *source,
388: regmatch_t *pm)
1.5 espie 389: {
390: int error;
391:
392: switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
393: case 0:
394: pbunsigned(pm[0].rm_so);
395: break;
396: case REG_NOMATCH:
397: pbnum(-1);
398: break;
399: default:
1.46 espie 400: exit_regerror(error, re, source);
1.5 espie 401: }
402: }
403:
404: /* In Gnu m4 mode, parentheses for backmatch don't work like POSIX 1003.2
405: * says. So we twiddle with the regexp before passing it to regcomp.
406: */
407: static char *
1.18 espie 408: twiddle(const char *p)
1.5 espie 409: {
1.28 espie 410: /* + at start of regexp is a normal character for Gnu m4 */
411: if (*p == '^') {
412: addchar(*p);
413: p++;
414: }
415: if (*p == '+') {
416: addchar('\\');
417: }
1.5 espie 418: /* This could use strcspn for speed... */
419: while (*p != '\0') {
1.14 espie 420: if (*p == '\\') {
421: switch(p[1]) {
422: case '(':
423: case ')':
424: case '|':
425: addchar(p[1]);
426: break;
427: case 'w':
428: addconstantstring("[_a-zA-Z0-9]");
429: break;
430: case 'W':
431: addconstantstring("[^_a-zA-Z0-9]");
432: break;
433: case '<':
434: addconstantstring("[[:<:]]");
435: break;
436: case '>':
437: addconstantstring("[[:>:]]");
438: break;
439: default:
440: addchars(p, 2);
441: break;
442: }
1.5 espie 443: p+=2;
444: continue;
445: }
1.14 espie 446: if (*p == '(' || *p == ')' || *p == '|')
1.5 espie 447: addchar('\\');
448:
449: addchar(*p);
450: p++;
451: }
452: return getstring();
453: }
454:
455: /* patsubst(string, regexp, opt replacement) */
456: /* argv[2]: string
457: * argv[3]: regexp
458: * argv[4]: opt rep
459: */
460: void
1.18 espie 461: dopatsubst(const char *argv[], int argc)
1.5 espie 462: {
463: if (argc <= 3) {
1.51 ! bcallah 464: m4_warnx("Too few arguments to patsubst");
1.5 espie 465: return;
466: }
1.20 espie 467: /* special case: empty regexp */
468: if (argv[3][0] == '\0') {
469: const char *s;
1.21 espie 470: size_t len;
1.41 marco 471: if (argc > 4 && argv[4])
1.21 espie 472: len = strlen(argv[4]);
473: else
474: len = 0;
1.20 espie 475: for (s = argv[2]; *s != '\0'; s++) {
476: addchars(argv[4], len);
477: addchar(*s);
478: }
479: } else {
480: int error;
481: regex_t re;
482: regmatch_t *pmatch;
1.30 espie 483: int mode = REG_EXTENDED;
1.46 espie 484: const char *source;
1.30 espie 485: size_t l = strlen(argv[3]);
486:
487: if (!mimic_gnu ||
1.41 marco 488: (argv[3][0] == '^') ||
1.30 espie 489: (l > 0 && argv[3][l-1] == '$'))
490: mode |= REG_NEWLINE;
1.20 espie 491:
1.46 espie 492: source = mimic_gnu ? twiddle(argv[3]) : argv[3];
493: error = regcomp(&re, source, mode);
1.20 espie 494: if (error != 0)
1.46 espie 495: exit_regerror(error, &re, source);
1.41 marco 496:
1.45 espie 497: pmatch = xreallocarray(NULL, re.re_nsub+1, sizeof(regmatch_t),
498: NULL);
1.46 espie 499: do_subst(argv[2], &re, source,
1.21 espie 500: argc > 4 && argv[4] != NULL ? argv[4] : "", pmatch);
1.20 espie 501: free(pmatch);
502: regfree(&re);
503: }
1.5 espie 504: pbstr(getstring());
505: }
506:
507: void
1.18 espie 508: doregexp(const char *argv[], int argc)
1.5 espie 509: {
510: int error;
511: regex_t re;
512: regmatch_t *pmatch;
1.46 espie 513: const char *source;
1.5 espie 514:
515: if (argc <= 3) {
1.51 ! bcallah 516: m4_warnx("Too few arguments to regexp");
1.5 espie 517: return;
518: }
1.40 espie 519: /* special gnu case */
520: if (argv[3][0] == '\0' && mimic_gnu) {
521: if (argc == 4 || argv[4] == NULL)
522: return;
1.41 marco 523: else
1.40 espie 524: pbstr(argv[4]);
525: }
1.46 espie 526: source = mimic_gnu ? twiddle(argv[3]) : argv[3];
527: error = regcomp(&re, source, REG_EXTENDED|REG_NEWLINE);
1.5 espie 528: if (error != 0)
1.46 espie 529: exit_regerror(error, &re, source);
1.41 marco 530:
1.45 espie 531: pmatch = xreallocarray(NULL, re.re_nsub+1, sizeof(regmatch_t), NULL);
1.40 espie 532: if (argc == 4 || argv[4] == NULL)
1.46 espie 533: do_regexpindex(argv[2], &re, source, pmatch);
1.5 espie 534: else
1.46 espie 535: do_regexp(argv[2], &re, source, argv[4], pmatch);
1.5 espie 536: free(pmatch);
537: regfree(&re);
1.33 espie 538: }
539:
540: void
541: doformat(const char *argv[], int argc)
542: {
543: const char *format = argv[2];
544: int pos = 3;
1.39 espie 545: int left_padded;
546: long width;
547: size_t l;
548: const char *thisarg;
549: char temp[2];
550: long extra;
1.35 espie 551:
1.33 espie 552: while (*format != 0) {
553: if (*format != '%') {
554: addchar(*format++);
1.39 espie 555: continue;
556: }
557:
558: format++;
559: if (*format == '%') {
560: addchar(*format++);
561: continue;
562: }
563: if (*format == 0) {
564: addchar('%');
565: break;
566: }
567:
568: if (*format == '*') {
569: format++;
570: if (pos >= argc)
1.41 marco 571: m4errx(1,
1.39 espie 572: "Format with too many format specifiers.");
573: width = strtol(argv[pos++], NULL, 10);
574: } else {
575: width = strtol(format, (char **)&format, 10);
576: }
577: if (width < 0) {
578: left_padded = 1;
579: width = -width;
1.37 espie 580: } else {
1.39 espie 581: left_padded = 0;
582: }
583: if (*format == '.') {
1.33 espie 584: format++;
1.39 espie 585: if (*format == '*') {
586: format++;
587: if (pos >= argc)
1.41 marco 588: m4errx(1,
1.39 espie 589: "Format with too many format specifiers.");
590: extra = strtol(argv[pos++], NULL, 10);
1.33 espie 591: } else {
1.39 espie 592: extra = strtol(format, (char **)&format, 10);
1.33 espie 593: }
1.39 espie 594: } else {
595: extra = LONG_MAX;
596: }
597: if (pos >= argc)
598: m4errx(1, "Format with too many format specifiers.");
599: switch(*format) {
600: case 's':
601: thisarg = argv[pos++];
602: break;
603: case 'c':
604: temp[0] = strtoul(argv[pos++], NULL, 10);
605: temp[1] = 0;
606: thisarg = temp;
607: break;
608: default:
1.41 marco 609: m4errx(1, "Unsupported format specification: %s.",
1.39 espie 610: argv[2]);
611: }
612: format++;
613: l = strlen(thisarg);
614: if (l > extra)
615: l = extra;
616: if (!left_padded) {
617: while (l < width--)
618: addchar(' ');
619: }
620: addchars(thisarg, l);
621: if (left_padded) {
622: while (l < width--)
623: addchar(' ');
1.33 espie 624: }
625: }
626: pbstr(getstring());
1.8 espie 627: }
628:
629: void
1.18 espie 630: doesyscmd(const char *cmd)
1.8 espie 631: {
632: int p[2];
633: pid_t pid, cpid;
634: char *argv[4];
635: int cc;
636: int status;
637:
638: /* Follow gnu m4 documentation: first flush buffers. */
639: fflush(NULL);
640:
641: argv[0] = "sh";
642: argv[1] = "-c";
643: argv[2] = (char *)cmd;
644: argv[3] = NULL;
645:
646: /* Just set up standard output, share stderr and stdin with m4 */
647: if (pipe(p) == -1)
648: err(1, "bad pipe");
649: switch(cpid = fork()) {
650: case -1:
651: err(1, "bad fork");
652: /* NOTREACHED */
653: case 0:
654: (void) close(p[0]);
655: (void) dup2(p[1], 1);
656: (void) close(p[1]);
657: execv(_PATH_BSHELL, argv);
658: exit(1);
659: default:
660: /* Read result in two stages, since m4's buffer is
661: * pushback-only. */
662: (void) close(p[1]);
663: do {
664: char result[BUFSIZE];
665: cc = read(p[0], result, sizeof result);
666: if (cc > 0)
667: addchars(result, cc);
668: } while (cc > 0 || (cc == -1 && errno == EINTR));
669:
670: (void) close(p[0]);
671: while ((pid = wait(&status)) != cpid && pid >= 0)
672: continue;
673: pbstr(getstring());
674: }
1.31 espie 675: }
676:
677: void
678: getdivfile(const char *name)
679: {
680: FILE *f;
681: int c;
682:
683: f = fopen(name, "r");
684: if (!f)
685: return;
686:
687: while ((c = getc(f))!= EOF)
688: putc(c, active);
689: (void) fclose(f);
1.5 espie 690: }
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