man.c revision 1.11 1 /* $NetBSD: man.c,v 1.11 1998/06/19 23:02:44 kleink Exp $ */
2
3 /*
4 * Copyright (c) 1987, 1993, 1994, 1995
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
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 #include <sys/cdefs.h>
37
38 #ifndef lint
39 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994, 1995\n\
40 The Regents of the University of California. All rights reserved.\n");
41 #endif /* not lint */
42
43 #ifndef lint
44 #if 0
45 static char sccsid[] = "@(#)man.c 8.17 (Berkeley) 1/31/95";
46 #else
47 __RCSID("$NetBSD: man.c,v 1.11 1998/06/19 23:02:44 kleink Exp $");
48 #endif
49 #endif /* not lint */
50
51 #include <sys/param.h>
52 #include <sys/queue.h>
53
54 #include <ctype.h>
55 #include <err.h>
56 #include <errno.h>
57 #include <fcntl.h>
58 #include <fnmatch.h>
59 #include <glob.h>
60 #include <signal.h>
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <unistd.h>
65
66 #include "config.h"
67 #include "pathnames.h"
68
69 int f_all, f_where;
70
71 int main __P((int, char **));
72 static void build_page __P((char *, char **));
73 static void cat __P((char *));
74 static char *check_pager __P((char *));
75 static int cleanup __P((void));
76 static void how __P((char *));
77 static void jump __P((char **, char *, char *));
78 static int manual __P((char *, TAG *, glob_t *));
79 static void onsig __P((int));
80 static void usage __P((void));
81
82 int
83 main(argc, argv)
84 int argc;
85 char *argv[];
86 {
87 TAG *defp, *defnewp, *section, *sectnewp, *subp;
88 ENTRY *e_defp, *e_sectp, *e_subp, *ep;
89 glob_t pg;
90 size_t len;
91 int ch, f_cat, f_how, found;
92 char **ap, *cmd, *machine, *p, *p_add, *p_path, *pager, *slashp;
93 char *conffile, buf[MAXPATHLEN * 2];
94
95 #ifdef __GNUC__
96 pager = NULL; /* XXX gcc -Wuninitialized */
97 #endif
98
99 f_cat = f_how = 0;
100 conffile = p_add = p_path = NULL;
101 while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:w")) != -1)
102 switch (ch) {
103 case 'a':
104 f_all = 1;
105 break;
106 case 'C':
107 conffile = optarg;
108 break;
109 case 'c':
110 case '-': /* Deprecated. */
111 f_cat = 1;
112 break;
113 case 'h':
114 f_how = 1;
115 break;
116 case 'm':
117 p_add = optarg;
118 break;
119 case 'M':
120 case 'P': /* Backward compatibility. */
121 p_path = optarg;
122 break;
123 /*
124 * The -f and -k options are backward compatible,
125 * undocumented ways of calling whatis(1) and apropos(1).
126 */
127 case 'f':
128 jump(argv, "-f", "whatis");
129 /* NOTREACHED */
130 case 'k':
131 jump(argv, "-k", "apropos");
132 /* NOTREACHED */
133 case 'w':
134 f_all = f_where = 1;
135 break;
136 case '?':
137 default:
138 usage();
139 }
140 argc -= optind;
141 argv += optind;
142
143 if (!*argv)
144 usage();
145
146 if (!f_cat && !f_how && !f_where)
147 if (!isatty(1))
148 f_cat = 1;
149 else if ((pager = getenv("PAGER")) != NULL)
150 pager = check_pager(pager);
151 else
152 pager = _PATH_PAGER;
153
154 /* Read the configuration file. */
155 config(conffile);
156
157 /* Get the machine type. */
158 if ((machine = getenv("MACHINE")) == NULL)
159 machine = MACHINE;
160
161 /* If there's no _default list, create an empty one. */
162 if ((defp = getlist("_default")) == NULL)
163 defp = addlist("_default");
164
165 /*
166 * 1: If the user specified a MANPATH variable, or set the -M
167 * option, we replace the _default list with the user's list,
168 * appending the entries in the _subdir list and the machine.
169 */
170 if (p_path == NULL)
171 p_path = getenv("MANPATH");
172 if (p_path != NULL) {
173 while ((e_defp = defp->list.tqh_first) != NULL) {
174 free(e_defp->s);
175 TAILQ_REMOVE(&defp->list, e_defp, q);
176 }
177 for (p = strtok(p_path, ":");
178 p != NULL; p = strtok(NULL, ":")) {
179 slashp = p[strlen(p) - 1] == '/' ? "" : "/";
180 e_subp = (subp = getlist("_subdir")) == NULL ?
181 NULL : subp->list.tqh_first;
182 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
183 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
184 p, slashp, e_subp->s, machine);
185 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
186 (ep->s = strdup(buf)) == NULL)
187 err(1, "malloc");
188 TAILQ_INSERT_TAIL(&defp->list, ep, q);
189 }
190 }
191 }
192
193 /*
194 * 2: If the user did not specify MANPATH, -M or a section, rewrite
195 * the _default list to include the _subdir list and the machine.
196 */
197 if (argv[1] == NULL)
198 section = NULL;
199 else if ((section = getlist(*argv)) != NULL)
200 ++argv;
201 if (p_path == NULL && section == NULL) {
202 defnewp = addlist("_default_new");
203 e_defp =
204 defp->list.tqh_first == NULL ? NULL : defp->list.tqh_first;
205 for (; e_defp != NULL; e_defp = e_defp->q.tqe_next) {
206 slashp =
207 e_defp->s[strlen(e_defp->s) - 1] == '/' ? "" : "/";
208 e_subp = (subp = getlist("_subdir")) == NULL ?
209 NULL : subp->list.tqh_first;
210 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
211 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
212 e_defp->s, slashp, e_subp->s, machine);
213 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
214 (ep->s = strdup(buf)) == NULL)
215 err(1, "malloc");
216 TAILQ_INSERT_TAIL(&defnewp->list, ep, q);
217 }
218 }
219 defp = getlist("_default");
220 while ((e_defp = defp->list.tqh_first) != NULL) {
221 free(e_defp->s);
222 TAILQ_REMOVE(&defp->list, e_defp, q);
223 }
224 free(defp->s);
225 TAILQ_REMOVE(&head, defp, q);
226 defnewp = getlist("_default_new");
227 free(defnewp->s);
228 defnewp->s = "_default";
229 defp = defnewp;
230 }
231
232 /*
233 * 3: If the user set the -m option, insert the user's list before
234 * whatever list we have, again appending the _subdir list and
235 * the machine.
236 */
237 if (p_add != NULL)
238 for (p = strtok(p_add, ":"); p != NULL; p = strtok(NULL, ":")) {
239 slashp = p[strlen(p) - 1] == '/' ? "" : "/";
240 e_subp = (subp = getlist("_subdir")) == NULL ?
241 NULL : subp->list.tqh_first;
242 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
243 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
244 p, slashp, e_subp->s, machine);
245 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
246 (ep->s = strdup(buf)) == NULL)
247 err(1, "malloc");
248 TAILQ_INSERT_HEAD(&defp->list, ep, q);
249 }
250 }
251
252 /*
253 * 4: If no -m was specified, and a section was, rewrite the section's
254 * paths (if they have a trailing slash) to append the _subdir list
255 * and the machine. This then becomes the _default list.
256 */
257 if (p_add == NULL && section != NULL) {
258 sectnewp = addlist("_section_new");
259 for (e_sectp = section->list.tqh_first;
260 e_sectp != NULL; e_sectp = e_sectp->q.tqe_next) {
261 if (e_sectp->s[strlen(e_sectp->s) - 1] != '/') {
262 (void)snprintf(buf, sizeof(buf),
263 "%s{/%s,}", e_sectp->s, machine);
264 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
265 (ep->s = strdup(buf)) == NULL)
266 err(1, "malloc");
267 TAILQ_INSERT_TAIL(§newp->list, ep, q);
268 continue;
269 }
270 e_subp = (subp = getlist("_subdir")) == NULL ?
271 NULL : subp->list.tqh_first;
272 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
273 (void)snprintf(buf, sizeof(buf), "%s%s{/%s,}",
274 e_sectp->s, e_subp->s, machine);
275 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
276 (ep->s = strdup(buf)) == NULL)
277 err(1, "malloc");
278 TAILQ_INSERT_TAIL(§newp->list, ep, q);
279 }
280 }
281 sectnewp->s = section->s;
282 defp = sectnewp;
283 TAILQ_REMOVE(&head, section, q);
284 }
285
286 /*
287 * 5: Search for the files. Set up an interrupt handler, so the
288 * temporary files go away.
289 */
290 (void)signal(SIGINT, onsig);
291 (void)signal(SIGHUP, onsig);
292
293 memset(&pg, 0, sizeof(pg));
294 for (found = 0; *argv; ++argv)
295 if (manual(*argv, defp, &pg))
296 found = 1;
297
298 /* 6: If nothing found, we're done. */
299 if (!found) {
300 (void)cleanup();
301 exit (1);
302 }
303
304 /* 7: If it's simple, display it fast. */
305 if (f_cat) {
306 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
307 if (**ap == '\0')
308 continue;
309 cat(*ap);
310 }
311 exit (cleanup());
312 }
313 if (f_how) {
314 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
315 if (**ap == '\0')
316 continue;
317 how(*ap);
318 }
319 exit(cleanup());
320 }
321 if (f_where) {
322 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
323 if (**ap == '\0')
324 continue;
325 (void)printf("%s\n", *ap);
326 }
327 exit(cleanup());
328 }
329
330 /*
331 * 8: We display things in a single command; build a list of things
332 * to display.
333 */
334 for (ap = pg.gl_pathv, len = strlen(pager) + 1; *ap != NULL; ++ap) {
335 if (**ap == '\0')
336 continue;
337 len += strlen(*ap) + 1;
338 }
339 if ((cmd = malloc(len)) == NULL) {
340 warn("malloc");
341 (void)cleanup();
342 exit(1);
343 }
344 p = cmd;
345 len = strlen(pager);
346 memmove(p, pager, len);
347 p += len;
348 *p++ = ' ';
349 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
350 if (**ap == '\0')
351 continue;
352 len = strlen(*ap);
353 memmove(p, *ap, len);
354 p += len;
355 *p++ = ' ';
356 }
357 *p = '\0';
358
359 /* Use system(3) in case someone's pager is "pager arg1 arg2". */
360 (void)system(cmd);
361
362 exit(cleanup());
363 }
364
365 /*
366 * manual --
367 * Search the manuals for the pages.
368 */
369 static int
370 manual(page, tag, pg)
371 char *page;
372 TAG *tag;
373 glob_t *pg;
374 {
375 ENTRY *ep, *e_sufp, *e_tag;
376 TAG *missp, *sufp;
377 int anyfound, cnt, found;
378 char *p, buf[MAXPATHLEN];
379
380 anyfound = 0;
381 buf[0] = '*';
382
383 /* For each element in the list... */
384 e_tag = tag == NULL ? NULL : tag->list.tqh_first;
385 for (; e_tag != NULL; e_tag = e_tag->q.tqe_next) {
386 (void)snprintf(buf, sizeof(buf), "%s/%s.*", e_tag->s, page);
387 if (glob(buf,
388 GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT, NULL, pg)) {
389 warn("globbing");
390 (void)cleanup();
391 exit(1);
392 }
393 if (pg->gl_matchc == 0)
394 continue;
395
396 /* Find out if it's really a man page. */
397 for (cnt = pg->gl_pathc - pg->gl_matchc;
398 cnt < pg->gl_pathc; ++cnt) {
399
400 /*
401 * Try the _suffix key words first.
402 *
403 * XXX
404 * Older versions of man.conf didn't have the suffix
405 * key words, it was assumed that everything was a .0.
406 * We just test for .0 first, it's fast and probably
407 * going to hit.
408 */
409 (void)snprintf(buf, sizeof(buf), "*/%s.0", page);
410 if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
411 goto next;
412
413 e_sufp = (sufp = getlist("_suffix")) == NULL ?
414 NULL : sufp->list.tqh_first;
415 for (found = 0;
416 e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
417 (void)snprintf(buf,
418 sizeof(buf), "*/%s%s", page, e_sufp->s);
419 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
420 found = 1;
421 break;
422 }
423 }
424 if (found)
425 goto next;
426
427 /* Try the _build key words next. */
428 e_sufp = (sufp = getlist("_build")) == NULL ?
429 NULL : sufp->list.tqh_first;
430 for (found = 0;
431 e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
432 for (p = e_sufp->s;
433 *p != '\0' && !isspace(*p); ++p);
434 if (*p == '\0')
435 continue;
436 *p = '\0';
437 (void)snprintf(buf,
438 sizeof(buf), "*/%s%s", page, e_sufp->s);
439 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
440 if (!f_where)
441 build_page(p + 1,
442 &pg->gl_pathv[cnt]);
443 *p = ' ';
444 found = 1;
445 break;
446 }
447 *p = ' ';
448 }
449 if (found) {
450 next: anyfound = 1;
451 if (!f_all) {
452 /* Delete any other matches. */
453 while (++cnt< pg->gl_pathc)
454 pg->gl_pathv[cnt] = "";
455 break;
456 }
457 continue;
458 }
459
460 /* It's not a man page, forget about it. */
461 pg->gl_pathv[cnt] = "";
462 }
463
464 if (anyfound && !f_all)
465 break;
466 }
467
468 /* If not found, enter onto the missing list. */
469 if (!anyfound) {
470 if ((missp = getlist("_missing")) == NULL)
471 missp = addlist("_missing");
472 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
473 (ep->s = strdup(page)) == NULL) {
474 warn("malloc");
475 (void)cleanup();
476 exit(1);
477 }
478 TAILQ_INSERT_TAIL(&missp->list, ep, q);
479 }
480 return (anyfound);
481 }
482
483 /*
484 * build_page --
485 * Build a man page for display.
486 */
487 static void
488 build_page(fmt, pathp)
489 char *fmt, **pathp;
490 {
491 static int warned;
492 ENTRY *ep;
493 TAG *intmpp;
494 int fd, n;
495 char *p, *b;
496 char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[sizeof(_PATH_TMP)];
497
498 /* Let the user know this may take awhile. */
499 if (!warned) {
500 warned = 1;
501 warnx("Formatting manual page...");
502 }
503
504 /*
505 * Historically man chdir'd to the root of the man tree.
506 * This was used in man pages that contained relative ".so"
507 * directives (including other man pages for command aliases etc.)
508 * It even went one step farther, by examining the first line
509 * of the man page and parsing the .so filename so it would
510 * make hard(?) links to the cat'ted man pages for space savings.
511 * (We don't do that here, but we could).
512 */
513
514 /* copy and find the end */
515 for (b = buf, p = *pathp; (*b++ = *p++) != '\0';)
516 continue;
517
518 /* skip the last two path components, page name and man[n] */
519 for (--b, --p, n = 2; b != buf; b--, p--)
520 if (*b == '/')
521 if (--n == 0) {
522 *b = '\0';
523 (void) chdir(buf);
524 p++;
525 break;
526 }
527
528
529 /* Add a remove-when-done list. */
530 if ((intmpp = getlist("_intmp")) == NULL)
531 intmpp = addlist("_intmp");
532
533 /* Move to the printf(3) format string. */
534 for (; *fmt && isspace(*fmt); ++fmt);
535
536 /*
537 * Get a temporary file and build a version of the file
538 * to display. Replace the old file name with the new one.
539 */
540 (void)strcpy(tpath, _PATH_TMP);
541 if ((fd = mkstemp(tpath)) == -1) {
542 warn("%s", tpath);
543 (void)cleanup();
544 exit(1);
545 }
546 (void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
547 (void)snprintf(cmd, sizeof(cmd), buf, p);
548 (void)system(cmd);
549 (void)close(fd);
550 if ((*pathp = strdup(tpath)) == NULL) {
551 warn("malloc");
552 (void)cleanup();
553 exit(1);
554 }
555
556 /* Link the built file into the remove-when-done list. */
557 if ((ep = malloc(sizeof(ENTRY))) == NULL) {
558 warn("malloc");
559 (void)cleanup();
560 exit(1);
561 }
562 ep->s = *pathp;
563 TAILQ_INSERT_TAIL(&intmpp->list, ep, q);
564 }
565
566 /*
567 * how --
568 * display how information
569 */
570 static void
571 how(fname)
572 char *fname;
573 {
574 FILE *fp;
575
576 int lcnt, print;
577 char *p, buf[256];
578
579 if (!(fp = fopen(fname, "r"))) {
580 warn("%s", fname);
581 (void)cleanup();
582 exit (1);
583 }
584 #define S1 "SYNOPSIS"
585 #define S2 "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
586 #define D1 "DESCRIPTION"
587 #define D2 "D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
588 for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
589 if (!strncmp(buf, S1, sizeof(S1) - 1) ||
590 !strncmp(buf, S2, sizeof(S2) - 1)) {
591 print = 1;
592 continue;
593 } else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
594 !strncmp(buf, D2, sizeof(D2) - 1))
595 return;
596 if (!print)
597 continue;
598 if (*buf == '\n')
599 ++lcnt;
600 else {
601 for(; lcnt; --lcnt)
602 (void)putchar('\n');
603 for (p = buf; isspace(*p); ++p);
604 (void)fputs(p, stdout);
605 }
606 }
607 (void)fclose(fp);
608 }
609
610 /*
611 * cat --
612 * cat out the file
613 */
614 static void
615 cat(fname)
616 char *fname;
617 {
618 int fd, n;
619 char buf[2048];
620
621 if ((fd = open(fname, O_RDONLY, 0)) < 0) {
622 warn("%s", fname);
623 (void)cleanup();
624 exit(1);
625 }
626 while ((n = read(fd, buf, sizeof(buf))) > 0)
627 if (write(STDOUT_FILENO, buf, n) != n) {
628 warn("write");
629 (void)cleanup();
630 exit (1);
631 }
632 if (n == -1) {
633 warn("read");
634 (void)cleanup();
635 exit(1);
636 }
637 (void)close(fd);
638 }
639
640 /*
641 * check_pager --
642 * check the user supplied page information
643 */
644 static char *
645 check_pager(name)
646 char *name;
647 {
648 char *p, *save;
649
650 /*
651 * if the user uses "more", we make it "more -s"; watch out for
652 * PAGER = "mypager /usr/ucb/more"
653 */
654 for (p = name; *p && !isspace(*p); ++p);
655 for (; p > name && *p != '/'; --p);
656 if (p != name)
657 ++p;
658
659 /* make sure it's "more", not "morex" */
660 if (!strncmp(p, "more", 4) && (!p[4] || isspace(p[4]))){
661 save = name;
662 /* allocate space to add the "-s" */
663 if (!(name =
664 malloc((u_int)(strlen(save) + sizeof("-s") + 1))))
665 err(1, "malloc");
666 (void)sprintf(name, "%s %s", save, "-s");
667 }
668 return(name);
669 }
670
671 /*
672 * jump --
673 * strip out flag argument and jump
674 */
675 static void
676 jump(argv, flag, name)
677 char **argv, *flag, *name;
678 {
679 char **arg;
680
681 argv[0] = name;
682 for (arg = argv + 1; *arg; ++arg)
683 if (!strcmp(*arg, flag))
684 break;
685 for (; *arg; ++arg)
686 arg[0] = arg[1];
687 execvp(name, argv);
688 (void)fprintf(stderr, "%s: Command not found.\n", name);
689 exit(1);
690 }
691
692 /*
693 * onsig --
694 * If signaled, delete the temporary files.
695 */
696 static void
697 onsig(signo)
698 int signo;
699 {
700 (void)cleanup();
701
702 (void)signal(signo, SIG_DFL);
703 (void)kill(getpid(), signo);
704
705 /* NOTREACHED */
706 exit (1);
707 }
708
709 /*
710 * cleanup --
711 * Clean up temporary files, show any error messages.
712 */
713 static int
714 cleanup()
715 {
716 TAG *intmpp, *missp;
717 ENTRY *ep;
718 int rval;
719
720 rval = 0;
721 ep = (missp = getlist("_missing")) == NULL ?
722 NULL : missp->list.tqh_first;
723 if (ep != NULL)
724 for (; ep != NULL; ep = ep->q.tqe_next) {
725 warnx("no entry for %s in the manual.", ep->s);
726 rval = 1;
727 }
728
729 ep = (intmpp = getlist("_intmp")) == NULL ?
730 NULL : intmpp->list.tqh_first;
731 for (; ep != NULL; ep = ep->q.tqe_next)
732 (void)unlink(ep->s);
733 return (rval);
734 }
735
736 /*
737 * usage --
738 * print usage message and die
739 */
740 static void
741 usage()
742 {
743 (void)fprintf(stderr,
744 "usage: man [-achw] [-C file] [-M path] [-m path] [section] title ...\n");
745 exit(1);
746 }
747