man.c revision 1.8 1 /* $NetBSD: man.c,v 1.8 1997/09/10 07:13:51 mikel 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 #ifndef lint
37 static char copyright[] =
38 "@(#) Copyright (c) 1987, 1993, 1994, 1995\n\
39 The Regents of the University of California. All rights reserved.\n";
40 #endif /* not lint */
41
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)man.c 8.17 (Berkeley) 1/31/95";
45 #else
46 static char rcsid[] = "$NetBSD: man.c,v 1.8 1997/09/10 07:13:51 mikel Exp $";
47 #endif
48 #endif /* not lint */
49
50 #include <sys/param.h>
51 #include <sys/queue.h>
52
53 #include <ctype.h>
54 #include <err.h>
55 #include <errno.h>
56 #include <fcntl.h>
57 #include <fnmatch.h>
58 #include <glob.h>
59 #include <signal.h>
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <string.h>
63 #include <unistd.h>
64
65 #include "config.h"
66 #include "pathnames.h"
67
68 int f_all, f_where;
69
70 static void build_page __P((char *, char **));
71 static void cat __P((char *));
72 static char *check_pager __P((char *));
73 static int cleanup __P((void));
74 static void how __P((char *));
75 static void jump __P((char **, char *, char *));
76 static int manual __P((char *, TAG *, glob_t *));
77 static void onsig __P((int));
78 static void usage __P((void));
79
80 int
81 main(argc, argv)
82 int argc;
83 char *argv[];
84 {
85 extern char *optarg;
86 extern int optind;
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 f_cat = f_how = 0;
96 conffile = p_add = p_path = NULL;
97 while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:w")) != EOF)
98 switch (ch) {
99 case 'a':
100 f_all = 1;
101 break;
102 case 'C':
103 conffile = optarg;
104 break;
105 case 'c':
106 case '-': /* Deprecated. */
107 f_cat = 1;
108 break;
109 case 'h':
110 f_how = 1;
111 break;
112 case 'm':
113 p_add = optarg;
114 break;
115 case 'M':
116 case 'P': /* Backward compatibility. */
117 p_path = optarg;
118 break;
119 /*
120 * The -f and -k options are backward compatible,
121 * undocumented ways of calling whatis(1) and apropos(1).
122 */
123 case 'f':
124 jump(argv, "-f", "whatis");
125 /* NOTREACHED */
126 case 'k':
127 jump(argv, "-k", "apropos");
128 /* NOTREACHED */
129 case 'w':
130 f_all = f_where = 1;
131 break;
132 case '?':
133 default:
134 usage();
135 }
136 argc -= optind;
137 argv += optind;
138
139 if (!*argv)
140 usage();
141
142 if (!f_cat && !f_how && !f_where)
143 if (!isatty(1))
144 f_cat = 1;
145 else if ((pager = getenv("PAGER")) != NULL)
146 pager = check_pager(pager);
147 else
148 pager = _PATH_PAGER;
149
150 /* Read the configuration file. */
151 config(conffile);
152
153 /* Get the machine type. */
154 if ((machine = getenv("MACHINE")) == NULL)
155 machine = MACHINE;
156
157 /* If there's no _default list, create an empty one. */
158 if ((defp = getlist("_default")) == NULL)
159 defp = addlist("_default");
160
161 /*
162 * 1: If the user specified a MANPATH variable, or set the -M
163 * option, we replace the _default list with the user's list,
164 * appending the entries in the _subdir list and the machine.
165 */
166 if (p_path == NULL)
167 p_path = getenv("MANPATH");
168 if (p_path != NULL) {
169 while ((e_defp = defp->list.tqh_first) != NULL) {
170 free(e_defp->s);
171 TAILQ_REMOVE(&defp->list, e_defp, q);
172 }
173 for (p = strtok(p_path, ":");
174 p != NULL; p = strtok(NULL, ":")) {
175 slashp = p[strlen(p) - 1] == '/' ? "" : "/";
176 e_subp = (subp = getlist("_subdir")) == NULL ?
177 NULL : subp->list.tqh_first;
178 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
179 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
180 p, slashp, e_subp->s, machine);
181 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
182 (ep->s = strdup(buf)) == NULL)
183 err(1, NULL);
184 TAILQ_INSERT_TAIL(&defp->list, ep, q);
185 }
186 }
187 }
188
189 /*
190 * 2: If the user did not specify MANPATH, -M or a section, rewrite
191 * the _default list to include the _subdir list and the machine.
192 */
193 if (argv[1] == NULL)
194 section = NULL;
195 else if ((section = getlist(*argv)) != NULL)
196 ++argv;
197 if (p_path == NULL && section == NULL) {
198 defnewp = addlist("_default_new");
199 e_defp =
200 defp->list.tqh_first == NULL ? NULL : defp->list.tqh_first;
201 for (; e_defp != NULL; e_defp = e_defp->q.tqe_next) {
202 slashp =
203 e_defp->s[strlen(e_defp->s) - 1] == '/' ? "" : "/";
204 e_subp = (subp = getlist("_subdir")) == NULL ?
205 NULL : subp->list.tqh_first;
206 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
207 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
208 e_defp->s, slashp, e_subp->s, machine);
209 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
210 (ep->s = strdup(buf)) == NULL)
211 err(1, NULL);
212 TAILQ_INSERT_TAIL(&defnewp->list, ep, q);
213 }
214 }
215 defp = getlist("_default");
216 while ((e_defp = defp->list.tqh_first) != NULL) {
217 free(e_defp->s);
218 TAILQ_REMOVE(&defp->list, e_defp, q);
219 }
220 free(defp->s);
221 TAILQ_REMOVE(&head, defp, q);
222 defnewp = getlist("_default_new");
223 free(defnewp->s);
224 defnewp->s = "_default";
225 defp = defnewp;
226 }
227
228 /*
229 * 3: If the user set the -m option, insert the user's list before
230 * whatever list we have, again appending the _subdir list and
231 * the machine.
232 */
233 if (p_add != NULL)
234 for (p = strtok(p_add, ":"); p != NULL; p = strtok(NULL, ":")) {
235 slashp = p[strlen(p) - 1] == '/' ? "" : "/";
236 e_subp = (subp = getlist("_subdir")) == NULL ?
237 NULL : subp->list.tqh_first;
238 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
239 (void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
240 p, slashp, e_subp->s, machine);
241 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
242 (ep->s = strdup(buf)) == NULL)
243 err(1, NULL);
244 TAILQ_INSERT_HEAD(&defp->list, ep, q);
245 }
246 }
247
248 /*
249 * 4: If no -m was specified, and a section was, rewrite the section's
250 * paths (if they have a trailing slash) to append the _subdir list
251 * and the machine. This then becomes the _default list.
252 */
253 if (p_add == NULL && section != NULL) {
254 sectnewp = addlist("_section_new");
255 for (e_sectp = section->list.tqh_first;
256 e_sectp != NULL; e_sectp = e_sectp->q.tqe_next) {
257 if (e_sectp->s[strlen(e_sectp->s) - 1] != '/') {
258 (void)snprintf(buf, sizeof(buf),
259 "%s{/%s,}", e_sectp->s, machine);
260 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
261 (ep->s = strdup(buf)) == NULL)
262 err(1, NULL);
263 TAILQ_INSERT_TAIL(§newp->list, ep, q);
264 continue;
265 }
266 e_subp = (subp = getlist("_subdir")) == NULL ?
267 NULL : subp->list.tqh_first;
268 for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
269 (void)snprintf(buf, sizeof(buf), "%s%s{/%s,}",
270 e_sectp->s, e_subp->s, machine);
271 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
272 (ep->s = strdup(buf)) == NULL)
273 err(1, NULL);
274 TAILQ_INSERT_TAIL(§newp->list, ep, q);
275 }
276 }
277 sectnewp->s = section->s;
278 defp = sectnewp;
279 TAILQ_REMOVE(&head, section, q);
280 }
281
282 /*
283 * 5: Search for the files. Set up an interrupt handler, so the
284 * temporary files go away.
285 */
286 (void)signal(SIGINT, onsig);
287 (void)signal(SIGHUP, onsig);
288
289 memset(&pg, 0, sizeof(pg));
290 for (found = 0; *argv; ++argv)
291 if (manual(*argv, defp, &pg))
292 found = 1;
293
294 /* 6: If nothing found, we're done. */
295 if (!found) {
296 (void)cleanup();
297 exit (1);
298 }
299
300 /* 7: If it's simple, display it fast. */
301 if (f_cat) {
302 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
303 if (**ap == '\0')
304 continue;
305 cat(*ap);
306 }
307 exit (cleanup());
308 }
309 if (f_how) {
310 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
311 if (**ap == '\0')
312 continue;
313 how(*ap);
314 }
315 exit(cleanup());
316 }
317 if (f_where) {
318 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
319 if (**ap == '\0')
320 continue;
321 (void)printf("%s\n", *ap);
322 }
323 exit(cleanup());
324 }
325
326 /*
327 * 8: We display things in a single command; build a list of things
328 * to display.
329 */
330 for (ap = pg.gl_pathv, len = strlen(pager) + 1; *ap != NULL; ++ap) {
331 if (**ap == '\0')
332 continue;
333 len += strlen(*ap) + 1;
334 }
335 if ((cmd = malloc(len)) == NULL) {
336 warn(NULL);
337 (void)cleanup();
338 exit(1);
339 }
340 p = cmd;
341 len = strlen(pager);
342 memmove(p, pager, len);
343 p += len;
344 *p++ = ' ';
345 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
346 if (**ap == '\0')
347 continue;
348 len = strlen(*ap);
349 memmove(p, *ap, len);
350 p += len;
351 *p++ = ' ';
352 }
353 *p = '\0';
354
355 /* Use system(3) in case someone's pager is "pager arg1 arg2". */
356 (void)system(cmd);
357
358 exit(cleanup());
359 }
360
361 /*
362 * manual --
363 * Search the manuals for the pages.
364 */
365 static int
366 manual(page, tag, pg)
367 char *page;
368 TAG *tag;
369 glob_t *pg;
370 {
371 ENTRY *ep, *e_sufp, *e_tag;
372 TAG *missp, *sufp;
373 int anyfound, cnt, found;
374 char *p, buf[MAXPATHLEN];
375
376 anyfound = 0;
377 buf[0] = '*';
378
379 /* For each element in the list... */
380 e_tag = tag == NULL ? NULL : tag->list.tqh_first;
381 for (; e_tag != NULL; e_tag = e_tag->q.tqe_next) {
382 (void)snprintf(buf, sizeof(buf), "%s/%s.*", e_tag->s, page);
383 if (glob(buf,
384 GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT | GLOB_QUOTE,
385 NULL, pg)) {
386 warn("globbing");
387 (void)cleanup();
388 exit(1);
389 }
390 if (pg->gl_matchc == 0)
391 continue;
392
393 /* Find out if it's really a man page. */
394 for (cnt = pg->gl_pathc - pg->gl_matchc;
395 cnt < pg->gl_pathc; ++cnt) {
396
397 /*
398 * Try the _suffix key words first.
399 *
400 * XXX
401 * Older versions of man.conf didn't have the suffix
402 * key words, it was assumed that everything was a .0.
403 * We just test for .0 first, it's fast and probably
404 * going to hit.
405 */
406 (void)snprintf(buf, sizeof(buf), "*/%s.0", page);
407 if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
408 goto next;
409
410 e_sufp = (sufp = getlist("_suffix")) == NULL ?
411 NULL : sufp->list.tqh_first;
412 for (found = 0;
413 e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
414 (void)snprintf(buf,
415 sizeof(buf), "*/%s%s", page, e_sufp->s);
416 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
417 found = 1;
418 break;
419 }
420 }
421 if (found)
422 goto next;
423
424 /* Try the _build key words next. */
425 e_sufp = (sufp = getlist("_build")) == NULL ?
426 NULL : sufp->list.tqh_first;
427 for (found = 0;
428 e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
429 for (p = e_sufp->s;
430 *p != '\0' && !isspace(*p); ++p);
431 if (*p == '\0')
432 continue;
433 *p = '\0';
434 (void)snprintf(buf,
435 sizeof(buf), "*/%s%s", page, e_sufp->s);
436 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
437 if (!f_where)
438 build_page(p + 1,
439 &pg->gl_pathv[cnt]);
440 *p = ' ';
441 found = 1;
442 break;
443 }
444 *p = ' ';
445 }
446 if (found) {
447 next: anyfound = 1;
448 if (!f_all) {
449 /* Delete any other matches. */
450 while (++cnt< pg->gl_pathc)
451 pg->gl_pathv[cnt] = "";
452 break;
453 }
454 continue;
455 }
456
457 /* It's not a man page, forget about it. */
458 pg->gl_pathv[cnt] = "";
459 }
460
461 if (anyfound && !f_all)
462 break;
463 }
464
465 /* If not found, enter onto the missing list. */
466 if (!anyfound) {
467 if ((missp = getlist("_missing")) == NULL)
468 missp = addlist("_missing");
469 if ((ep = malloc(sizeof(ENTRY))) == NULL ||
470 (ep->s = strdup(page)) == NULL) {
471 warn(NULL);
472 (void)cleanup();
473 exit(1);
474 }
475 TAILQ_INSERT_TAIL(&missp->list, ep, q);
476 }
477 return (anyfound);
478 }
479
480 /*
481 * build_page --
482 * Build a man page for display.
483 */
484 static void
485 build_page(fmt, pathp)
486 char *fmt, **pathp;
487 {
488 static int warned;
489 ENTRY *ep;
490 TAG *intmpp;
491 int fd, n;
492 char *p, *b;
493 char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[sizeof(_PATH_TMP)];
494
495 /* Let the user know this may take awhile. */
496 if (!warned) {
497 warned = 1;
498 warnx("Formatting manual page...");
499 }
500
501 /*
502 * Historically man chdir'd to the root of the man tree.
503 * This was used in man pages that contained relative ".so"
504 * directives (including other man pages for command aliases etc.)
505 * It even went one step farther, by examining the first line
506 * of the man page and parsing the .so filename so it would
507 * make hard(?) links to the cat'ted man pages for space savings.
508 * (We don't do that here, but we could).
509 */
510
511 /* copy and find the end */
512 for (b = buf, p = *pathp; (*b++ = *p++) != '\0';)
513 continue;
514
515 /* skip the last two path components, page name and man[n] */
516 for (--b, n = 2; b != buf; b--)
517 if (*b == '/')
518 if (--n == 0) {
519 *b = '\0';
520 (void) chdir(buf);
521 }
522
523
524 /* Add a remove-when-done list. */
525 if ((intmpp = getlist("_intmp")) == NULL)
526 intmpp = addlist("_intmp");
527
528 /* Move to the printf(3) format string. */
529 for (; *fmt && isspace(*fmt); ++fmt);
530
531 /*
532 * Get a temporary file and build a version of the file
533 * to display. Replace the old file name with the new one.
534 */
535 (void)strcpy(tpath, _PATH_TMP);
536 if ((fd = mkstemp(tpath)) == -1) {
537 warn("%s", tpath);
538 (void)cleanup();
539 exit(1);
540 }
541 (void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
542 (void)snprintf(cmd, sizeof(cmd), buf, *pathp);
543 (void)system(cmd);
544 (void)close(fd);
545 if ((*pathp = strdup(tpath)) == NULL) {
546 warn(NULL);
547 (void)cleanup();
548 exit(1);
549 }
550
551 /* Link the built file into the remove-when-done list. */
552 if ((ep = malloc(sizeof(ENTRY))) == NULL) {
553 warn(NULL);
554 (void)cleanup();
555 exit(1);
556 }
557 ep->s = *pathp;
558 TAILQ_INSERT_TAIL(&intmpp->list, ep, q);
559 }
560
561 /*
562 * how --
563 * display how information
564 */
565 static void
566 how(fname)
567 char *fname;
568 {
569 FILE *fp;
570
571 int lcnt, print;
572 char *p, buf[256];
573
574 if (!(fp = fopen(fname, "r"))) {
575 warn("%s", fname);
576 (void)cleanup();
577 exit (1);
578 }
579 #define S1 "SYNOPSIS"
580 #define S2 "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
581 #define D1 "DESCRIPTION"
582 #define D2 "D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
583 for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
584 if (!strncmp(buf, S1, sizeof(S1) - 1) ||
585 !strncmp(buf, S2, sizeof(S2) - 1)) {
586 print = 1;
587 continue;
588 } else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
589 !strncmp(buf, D2, sizeof(D2) - 1))
590 return;
591 if (!print)
592 continue;
593 if (*buf == '\n')
594 ++lcnt;
595 else {
596 for(; lcnt; --lcnt)
597 (void)putchar('\n');
598 for (p = buf; isspace(*p); ++p);
599 (void)fputs(p, stdout);
600 }
601 }
602 (void)fclose(fp);
603 }
604
605 /*
606 * cat --
607 * cat out the file
608 */
609 static void
610 cat(fname)
611 char *fname;
612 {
613 int fd, n;
614 char buf[2048];
615
616 if ((fd = open(fname, O_RDONLY, 0)) < 0) {
617 warn("%s", fname);
618 (void)cleanup();
619 exit(1);
620 }
621 while ((n = read(fd, buf, sizeof(buf))) > 0)
622 if (write(STDOUT_FILENO, buf, n) != n) {
623 warn("write");
624 (void)cleanup();
625 exit (1);
626 }
627 if (n == -1) {
628 warn("read");
629 (void)cleanup();
630 exit(1);
631 }
632 (void)close(fd);
633 }
634
635 /*
636 * check_pager --
637 * check the user supplied page information
638 */
639 static char *
640 check_pager(name)
641 char *name;
642 {
643 char *p, *save;
644
645 /*
646 * if the user uses "more", we make it "more -s"; watch out for
647 * PAGER = "mypager /usr/ucb/more"
648 */
649 for (p = name; *p && !isspace(*p); ++p);
650 for (; p > name && *p != '/'; --p);
651 if (p != name)
652 ++p;
653
654 /* make sure it's "more", not "morex" */
655 if (!strncmp(p, "more", 4) && (!p[4] || isspace(p[4]))){
656 save = name;
657 /* allocate space to add the "-s" */
658 if (!(name =
659 malloc((u_int)(strlen(save) + sizeof("-s") + 1))))
660 err(1, NULL);
661 (void)sprintf(name, "%s %s", save, "-s");
662 }
663 return(name);
664 }
665
666 /*
667 * jump --
668 * strip out flag argument and jump
669 */
670 static void
671 jump(argv, flag, name)
672 char **argv, *flag, *name;
673 {
674 char **arg;
675
676 argv[0] = name;
677 for (arg = argv + 1; *arg; ++arg)
678 if (!strcmp(*arg, flag))
679 break;
680 for (; *arg; ++arg)
681 arg[0] = arg[1];
682 execvp(name, argv);
683 (void)fprintf(stderr, "%s: Command not found.\n", name);
684 exit(1);
685 }
686
687 /*
688 * onsig --
689 * If signaled, delete the temporary files.
690 */
691 static void
692 onsig(signo)
693 int signo;
694 {
695 (void)cleanup();
696
697 (void)signal(signo, SIG_DFL);
698 (void)kill(getpid(), signo);
699
700 /* NOTREACHED */
701 exit (1);
702 }
703
704 /*
705 * cleanup --
706 * Clean up temporary files, show any error messages.
707 */
708 static int
709 cleanup()
710 {
711 TAG *intmpp, *missp;
712 ENTRY *ep;
713 int rval;
714
715 rval = 0;
716 ep = (missp = getlist("_missing")) == NULL ?
717 NULL : missp->list.tqh_first;
718 if (ep != NULL)
719 for (; ep != NULL; ep = ep->q.tqe_next) {
720 warnx("no entry for %s in the manual.", ep->s);
721 rval = 1;
722 }
723
724 ep = (intmpp = getlist("_intmp")) == NULL ?
725 NULL : intmpp->list.tqh_first;
726 for (; ep != NULL; ep = ep->q.tqe_next)
727 (void)unlink(ep->s);
728 return (rval);
729 }
730
731 /*
732 * usage --
733 * print usage message and die
734 */
735 static void
736 usage()
737 {
738 (void)fprintf(stderr,
739 "usage: man [-achw] [-C file] [-M path] [-m path] [section] title ...\n");
740 exit(1);
741 }
742