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1.17 ! espie 1: /* $OpenBSD: gnum4.c,v 1.16 2002/02/16 21:27:48 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:
28: /*
29: * functions needed to support gnu-m4 extensions, including a fake freezing
30: */
31:
32: #include <sys/param.h>
1.5 espie 33: #include <sys/types.h>
1.8 espie 34: #include <sys/wait.h>
1.5 espie 35: #include <ctype.h>
1.8 espie 36: #include <paths.h>
1.5 espie 37: #include <regex.h>
1.1 espie 38: #include <stddef.h>
39: #include <stdlib.h>
40: #include <stdio.h>
41: #include <string.h>
42: #include <err.h>
1.8 espie 43: #include <errno.h>
44: #include <unistd.h>
1.1 espie 45: #include "mdef.h"
46: #include "stdd.h"
47: #include "extern.h"
48:
1.5 espie 49:
50: int mimic_gnu = 0;
51:
1.1 espie 52: /*
53: * Support for include path search
54: * First search in the the current directory.
55: * If not found, and the path is not absolute, include path kicks in.
56: * First, -I options, in the order found on the command line.
57: * Then M4PATH env variable
58: */
59:
60: struct path_entry {
61: char *name;
62: struct path_entry *next;
63: } *first, *last;
64:
1.16 millert 65: static struct path_entry *new_path_entry(const char *);
66: static void ensure_m4path(void);
67: static struct input_file *dopath(struct input_file *, const char *);
1.3 espie 68:
1.1 espie 69: static struct path_entry *
70: new_path_entry(dirname)
1.3 espie 71: const char *dirname;
1.1 espie 72: {
73: struct path_entry *n;
74:
75: n = malloc(sizeof(struct path_entry));
76: if (!n)
77: errx(1, "out of memory");
78: n->name = strdup(dirname);
79: if (!n->name)
80: errx(1, "out of memory");
81: n->next = 0;
82: return n;
83: }
84:
85: void
86: addtoincludepath(dirname)
87: const char *dirname;
88: {
89: struct path_entry *n;
90:
91: n = new_path_entry(dirname);
92:
93: if (last) {
94: last->next = n;
95: last = n;
96: }
97: else
98: last = first = n;
99: }
100:
101: static void
102: ensure_m4path()
103: {
104: static int envpathdone = 0;
105: char *envpath;
106: char *sweep;
107: char *path;
108:
109: if (envpathdone)
110: return;
111: envpathdone = TRUE;
112: envpath = getenv("M4PATH");
113: if (!envpath)
114: return;
115: /* for portability: getenv result is read-only */
116: envpath = strdup(envpath);
117: if (!envpath)
118: errx(1, "out of memory");
119: for (sweep = envpath;
120: (path = strsep(&sweep, ":")) != NULL;)
121: addtoincludepath(path);
122: free(envpath);
123: }
124:
125: static
1.4 espie 126: struct input_file *
127: dopath(i, filename)
128: struct input_file *i;
1.3 espie 129: const char *filename;
1.1 espie 130: {
131: char path[MAXPATHLEN];
132: struct path_entry *pe;
1.4 espie 133: FILE *f;
1.1 espie 134:
135: for (pe = first; pe; pe = pe->next) {
136: snprintf(path, sizeof(path), "%s/%s", pe->name, filename);
1.4 espie 137: if ((f = fopen(path, "r")) != 0) {
138: set_input(i, f, path);
139: return i;
140: }
1.1 espie 141: }
142: return NULL;
143: }
144:
1.4 espie 145: struct input_file *
146: fopen_trypath(i, filename)
147: struct input_file *i;
1.1 espie 148: const char *filename;
149: {
150: FILE *f;
151:
152: f = fopen(filename, "r");
1.4 espie 153: if (f != NULL) {
154: set_input(i, f, filename);
155: return i;
156: }
1.1 espie 157: if (filename[0] == '/')
158: return NULL;
159:
160: ensure_m4path();
161:
1.4 espie 162: return dopath(i, filename);
1.1 espie 163: }
164:
1.5 espie 165: void
166: doindir(argv, argc)
167: const char *argv[];
168: int argc;
169: {
170: ndptr p;
171:
172: p = lookup(argv[2]);
173: if (p == NULL)
174: errx(1, "undefined macro %s", argv[2]);
175: argv[1] = p->defn;
1.12 espie 176: eval(argv+1, argc-1, p->type);
1.5 espie 177: }
178:
179: void
180: dobuiltin(argv, argc)
181: const char *argv[];
182: int argc;
183: {
184: int n;
185: argv[1] = NULL;
186: n = builtin_type(argv[2]);
187: if (n != -1)
1.6 espie 188: eval(argv+1, argc-1, n);
1.5 espie 189: else
190: errx(1, "unknown builtin %s", argv[2]);
191: }
192:
193:
194: /* We need some temporary buffer space, as pb pushes BACK and substitution
195: * proceeds forward... */
196: static char *buffer;
197: static size_t bufsize = 0;
198: static size_t current = 0;
199:
1.16 millert 200: static void addchars(const char *, size_t);
1.17 ! espie 201: static void addchar(int);
1.16 millert 202: static char *twiddle(const char *);
203: static char *getstring(void);
204: static void exit_regerror(int, regex_t *);
205: static void do_subst(const char *, regex_t *, const char *, regmatch_t *);
206: static void do_regexpindex(const char *, regex_t *, regmatch_t *);
207: static void do_regexp(const char *, regex_t *, const char *, regmatch_t *);
208: static void add_sub(int, const char *, regex_t *, regmatch_t *);
209: static void add_replace(const char *, regex_t *, const char *, regmatch_t *);
1.14 espie 210: #define addconstantstring(s) addchars((s), sizeof(s)-1)
1.5 espie 211:
212: static void
213: addchars(c, n)
214: const char *c;
215: size_t n;
216: {
217: if (n == 0)
218: return;
1.15 espie 219: while (current + n > bufsize) {
1.5 espie 220: if (bufsize == 0)
221: bufsize = 1024;
222: else
223: bufsize *= 2;
224: buffer = realloc(buffer, bufsize);
225: if (buffer == NULL)
226: errx(1, "out of memory");
227: }
228: memcpy(buffer+current, c, n);
229: current += n;
230: }
231:
232: static void
233: addchar(c)
1.17 ! espie 234: int c;
1.5 espie 235: {
236: if (current +1 > bufsize) {
237: if (bufsize == 0)
238: bufsize = 1024;
239: else
240: bufsize *= 2;
241: buffer = realloc(buffer, bufsize);
242: if (buffer == NULL)
243: errx(1, "out of memory");
244: }
245: buffer[current++] = c;
246: }
247:
248: static char *
249: getstring()
250: {
251: addchar('\0');
252: current = 0;
253: return buffer;
254: }
255:
256:
257: static void
258: exit_regerror(er, re)
259: int er;
260: regex_t *re;
261: {
262: size_t errlen;
263: char *errbuf;
264:
265: errlen = regerror(er, re, NULL, 0);
266: errbuf = xalloc(errlen);
267: regerror(er, re, errbuf, errlen);
268: errx(1, "regular expression error: %s", errbuf);
269: }
270:
271: static void
272: add_sub(n, string, re, pm)
273: int n;
274: const char *string;
275: regex_t *re;
276: regmatch_t *pm;
277: {
278: if (n > re->re_nsub)
279: warnx("No subexpression %d", n);
280: /* Subexpressions that did not match are
281: * not an error. */
282: else if (pm[n].rm_so != -1 &&
283: pm[n].rm_eo != -1) {
284: addchars(string + pm[n].rm_so,
285: pm[n].rm_eo - pm[n].rm_so);
286: }
287: }
288:
289: /* Add replacement string to the output buffer, recognizing special
290: * constructs and replacing them with substrings of the original string.
291: */
292: static void
293: add_replace(string, re, replace, pm)
294: const char *string;
295: regex_t *re;
296: const char *replace;
297: regmatch_t *pm;
298: {
299: const char *p;
300:
301: for (p = replace; *p != '\0'; p++) {
302: if (*p == '&' && !mimic_gnu) {
303: add_sub(0, string, re, pm);
304: continue;
305: }
306: if (*p == '\\') {
307: if (p[1] == '\\') {
308: addchar(p[1]);
1.10 espie 309: p++;
1.5 espie 310: continue;
311: }
312: if (p[1] == '&') {
313: if (mimic_gnu)
314: add_sub(0, string, re, pm);
315: else
316: addchar(p[1]);
317: p++;
318: continue;
319: }
320: if (isdigit(p[1])) {
321: add_sub(*(++p) - '0', string, re, pm);
322: continue;
323: }
324: }
325: addchar(*p);
326: }
327: }
328:
329: static void
330: do_subst(string, re, replace, pm)
331: const char *string;
332: regex_t *re;
333: const char *replace;
334: regmatch_t *pm;
335: {
336: int error;
1.11 espie 337: int flags = 0;
338: const char *last_match = NULL;
1.5 espie 339:
1.11 espie 340: while ((error = regexec(re, string, re->re_nsub+1, pm, flags)) == 0) {
1.13 espie 341: if (pm[0].rm_eo != 0) {
342: if (string[pm[0].rm_eo-1] == '\n')
343: flags = 0;
344: else
345: flags = REG_NOTBOL;
346: }
1.5 espie 347:
348: /* NULL length matches are special... We use the `vi-mode'
349: * rule: don't allow a NULL-match at the last match
350: * position.
351: */
1.11 espie 352: if (pm[0].rm_so == pm[0].rm_eo &&
353: string + pm[0].rm_so == last_match) {
1.5 espie 354: if (*string == '\0')
355: return;
356: addchar(*string);
1.13 espie 357: if (*string++ == '\n')
358: flags = 0;
359: else
360: flags = REG_NOTBOL;
1.5 espie 361: continue;
362: }
1.11 espie 363: last_match = string + pm[0].rm_so;
364: addchars(string, pm[0].rm_so);
1.5 espie 365: add_replace(string, re, replace, pm);
366: string += pm[0].rm_eo;
367: }
368: if (error != REG_NOMATCH)
369: exit_regerror(error, re);
370: pbstr(string);
371: }
372:
373: static void
374: do_regexp(string, re, replace, pm)
375: const char *string;
376: regex_t *re;
377: const char *replace;
378: regmatch_t *pm;
379: {
380: int error;
381:
382: switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
383: case 0:
384: add_replace(string, re, replace, pm);
385: pbstr(getstring());
386: break;
387: case REG_NOMATCH:
388: break;
389: default:
390: exit_regerror(error, re);
391: }
392: }
393:
394: static void
395: do_regexpindex(string, re, pm)
396: const char *string;
397: regex_t *re;
398: regmatch_t *pm;
399: {
400: int error;
401:
402: switch(error = regexec(re, string, re->re_nsub+1, pm, 0)) {
403: case 0:
404: pbunsigned(pm[0].rm_so);
405: break;
406: case REG_NOMATCH:
407: pbnum(-1);
408: break;
409: default:
410: exit_regerror(error, re);
411: }
412: }
413:
414: /* In Gnu m4 mode, parentheses for backmatch don't work like POSIX 1003.2
415: * says. So we twiddle with the regexp before passing it to regcomp.
416: */
417: static char *
418: twiddle(p)
419: const char *p;
420: {
421: /* This could use strcspn for speed... */
422: while (*p != '\0') {
1.14 espie 423: if (*p == '\\') {
424: switch(p[1]) {
425: case '(':
426: case ')':
427: case '|':
428: addchar(p[1]);
429: break;
430: case 'w':
431: addconstantstring("[_a-zA-Z0-9]");
432: break;
433: case 'W':
434: addconstantstring("[^_a-zA-Z0-9]");
435: break;
436: case '<':
437: addconstantstring("[[:<:]]");
438: break;
439: case '>':
440: addconstantstring("[[:>:]]");
441: break;
442: default:
443: addchars(p, 2);
444: break;
445: }
1.5 espie 446: p+=2;
447: continue;
448: }
1.14 espie 449: if (*p == '(' || *p == ')' || *p == '|')
1.5 espie 450: addchar('\\');
451:
452: addchar(*p);
453: p++;
454: }
455: return getstring();
456: }
457:
458: /* patsubst(string, regexp, opt replacement) */
459: /* argv[2]: string
460: * argv[3]: regexp
461: * argv[4]: opt rep
462: */
463: void
464: dopatsubst(argv, argc)
465: const char *argv[];
466: int argc;
467: {
468: int error;
469: regex_t re;
470: regmatch_t *pmatch;
471:
472: if (argc <= 3) {
473: warnx("Too few arguments to patsubst");
474: return;
475: }
476: error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
1.11 espie 477: REG_NEWLINE | REG_EXTENDED);
1.5 espie 478: if (error != 0)
479: exit_regerror(error, &re);
480:
481: pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub+1));
1.7 espie 482: do_subst(argv[2], &re,
483: argc != 4 && argv[4] != NULL ? argv[4] : "", pmatch);
1.5 espie 484: pbstr(getstring());
485: free(pmatch);
486: regfree(&re);
487: }
488:
489: void
490: doregexp(argv, argc)
491: const char *argv[];
492: int argc;
493: {
494: int error;
495: regex_t re;
496: regmatch_t *pmatch;
497:
498: if (argc <= 3) {
1.7 espie 499: warnx("Too few arguments to regexp");
1.5 espie 500: return;
501: }
502: error = regcomp(&re, mimic_gnu ? twiddle(argv[3]) : argv[3],
503: REG_EXTENDED);
504: if (error != 0)
505: exit_regerror(error, &re);
506:
507: pmatch = xalloc(sizeof(regmatch_t) * (re.re_nsub+1));
1.7 espie 508: if (argv[4] == NULL || argc == 4)
1.5 espie 509: do_regexpindex(argv[2], &re, pmatch);
510: else
511: do_regexp(argv[2], &re, argv[4], pmatch);
512: free(pmatch);
513: regfree(&re);
1.8 espie 514: }
515:
516: void
517: doesyscmd(cmd)
518: const char *cmd;
519: {
520: int p[2];
521: pid_t pid, cpid;
522: char *argv[4];
523: int cc;
524: int status;
525:
526: /* Follow gnu m4 documentation: first flush buffers. */
527: fflush(NULL);
528:
529: argv[0] = "sh";
530: argv[1] = "-c";
531: argv[2] = (char *)cmd;
532: argv[3] = NULL;
533:
534: /* Just set up standard output, share stderr and stdin with m4 */
535: if (pipe(p) == -1)
536: err(1, "bad pipe");
537: switch(cpid = fork()) {
538: case -1:
539: err(1, "bad fork");
540: /* NOTREACHED */
541: case 0:
542: (void) close(p[0]);
543: (void) dup2(p[1], 1);
544: (void) close(p[1]);
545: execv(_PATH_BSHELL, argv);
546: exit(1);
547: default:
548: /* Read result in two stages, since m4's buffer is
549: * pushback-only. */
550: (void) close(p[1]);
551: do {
552: char result[BUFSIZE];
553: cc = read(p[0], result, sizeof result);
554: if (cc > 0)
555: addchars(result, cc);
556: } while (cc > 0 || (cc == -1 && errno == EINTR));
557:
558: (void) close(p[0]);
559: while ((pid = wait(&status)) != cpid && pid >= 0)
560: continue;
561: pbstr(getstring());
562: }
1.5 espie 563: }