man.c revision 1.36 1 /* $NetBSD: man.c,v 1.36 2007/10/05 07:38:52 lukem 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33
34 #ifndef lint
35 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994, 1995\n\
36 The Regents of the University of California. All rights reserved.\n");
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)man.c 8.17 (Berkeley) 1/31/95";
42 #else
43 __RCSID("$NetBSD: man.c,v 1.36 2007/10/05 07:38:52 lukem Exp $");
44 #endif
45 #endif /* not lint */
46
47 #include <sys/param.h>
48 #include <sys/queue.h>
49 #include <sys/utsname.h>
50
51 #include <ctype.h>
52 #include <err.h>
53 #include <errno.h>
54 #include <fcntl.h>
55 #include <fnmatch.h>
56 #include <glob.h>
57 #include <signal.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62 #include <util.h>
63
64 #include "manconf.h"
65 #include "pathnames.h"
66
67 #ifndef MAN_DEBUG
68 #define MAN_DEBUG 0 /* debug path output */
69 #endif
70
71 /*
72 * manstate: structure collecting the current global state so we can
73 * easily identify it and pass it to helper functions in one arg.
74 */
75 struct manstate {
76 /* command line flags */
77 int all; /* -a: show all matches rather than first */
78 int cat; /* -c: do not use a pager */
79 char *conffile; /* -C: use alternate config file */
80 int how; /* -h: show SYNOPSIS only */
81 char *manpath; /* -M: alternate MANPATH */
82 char *addpath; /* -m: add these dirs to front of manpath */
83 char *pathsearch; /* -S: path of man must contain this string */
84 char *sectionname; /* -s: limit search to a given man section */
85 int where; /* -w: just show paths of all matching files */
86
87 /* important tags from the config file */
88 TAG *defaultpath; /* _default: default MANPATH */
89 TAG *subdirs; /* _subdir: default subdir search list */
90 TAG *suffixlist; /* _suffix: for files that can be cat()'d */
91 TAG *buildlist; /* _build: for files that must be built */
92
93 /* tags for internal use */
94 TAG *intmp; /* _intmp: tmp files we must cleanup */
95 TAG *missinglist; /* _missing: pages we couldn't find */
96 TAG *mymanpath; /* _new_path: final version of MANPATH */
97 TAG *section; /* <sec>: tag for m.sectionname */
98
99 /* other misc stuff */
100 const char *pager; /* pager to use */
101 size_t pagerlen; /* length of the above */
102 };
103
104 /*
105 * prototypes
106 */
107 int main(int, char **);
108 static void build_page(char *, char **, struct manstate *);
109 static void cat(char *);
110 static const char *check_pager(const char *);
111 static int cleanup(void);
112 static void how(char *);
113 static void jump(char **, char *, char *);
114 static int manual(char *, struct manstate *, glob_t *);
115 static void onsig(int);
116 static void usage(void);
117
118 /*
119 * main function
120 */
121 int
122 main(int argc, char **argv)
123 {
124 static struct manstate m = { 0 }; /* init to zero */
125 int ch, abs_section, found;
126 const char *machine;
127 ENTRY *esubd, *epath;
128 char *p, **ap, *cmd, buf[MAXPATHLEN * 2];
129 size_t len;
130 glob_t pg;
131
132 /*
133 * parse command line...
134 */
135 while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:s:S:w")) != -1)
136 switch (ch) {
137 case 'a':
138 m.all = 1;
139 break;
140 case 'C':
141 m.conffile = optarg;
142 break;
143 case 'c':
144 case '-': /* XXX: '-' is a deprecated version of '-c' */
145 m.cat = 1;
146 break;
147 case 'h':
148 m.how = 1;
149 break;
150 case 'm':
151 m.addpath = optarg;
152 break;
153 case 'M':
154 case 'P': /* -P for backward compatibility */
155 m.manpath = strdup(optarg);
156 break;
157 /*
158 * The -f and -k options are backward compatible,
159 * undocumented ways of calling whatis(1) and apropos(1).
160 */
161 case 'f':
162 jump(argv, "-f", "whatis");
163 /* NOTREACHED */
164 case 'k':
165 jump(argv, "-k", "apropos");
166 /* NOTREACHED */
167 case 's':
168 if (m.sectionname != NULL)
169 usage();
170 m.sectionname = optarg;
171 break;
172 case 'S':
173 m.pathsearch = optarg;
174 break;
175 case 'w':
176 m.all = m.where = 1;
177 break;
178 case '?':
179 default:
180 usage();
181 }
182 argc -= optind;
183 argv += optind;
184
185 if (!argc)
186 usage();
187
188 /*
189 * read the configuration file and collect any other information
190 * we will need (machine type, pager, section [if specified
191 * without '-s'], and MANPATH through the environment).
192 */
193 config(m.conffile); /* exits on error ... */
194
195 if ((machine = getenv("MACHINE")) == NULL) {
196 struct utsname utsname;
197
198 if (uname(&utsname) == -1) {
199 perror("uname");
200 exit(1);
201 }
202 machine = utsname.machine;
203 }
204
205 if (!m.cat && !m.how && !m.where) { /* if we need a pager ... */
206 if (!isatty(STDOUT_FILENO)) {
207 m.cat = 1;
208 } else {
209 if ((m.pager = getenv("PAGER")) != NULL &&
210 m.pager[0] != '\0')
211 m.pager = check_pager(m.pager);
212 else
213 m.pager = _PATH_PAGER;
214 m.pagerlen = strlen(m.pager);
215 }
216 }
217
218 /* do we need to set m.section to a non-null value? */
219 if (m.sectionname) {
220
221 m.section = gettag(m.sectionname, 0); /* -s must be a section */
222 if (m.section == NULL)
223 errx(1, "unknown section: %s", m.sectionname);
224
225 } else if (argc > 1) {
226
227 m.section = gettag(*argv, 0); /* might be a section? */
228 if (m.section) {
229 argv++;
230 argc--;
231 }
232
233 }
234
235 if (m.manpath == NULL)
236 m.manpath = getenv("MANPATH"); /* note: -M overrides getenv */
237
238
239 /*
240 * get default values from config file, plus create the tags we
241 * use for keeping internal state. make sure all our mallocs
242 * go through.
243 */
244 /* from cfg file */
245 m.defaultpath = gettag("_default", 1);
246 m.subdirs = gettag("_subdir", 1);
247 m.suffixlist = gettag("_suffix", 1);
248 m.buildlist = gettag("_build", 1);
249 /* internal use */
250 m.mymanpath = gettag("_new_path", 1);
251 m.missinglist = gettag("_missing", 1);
252 m.intmp = gettag("_intmp", 1);
253 if (!m.defaultpath || !m.subdirs || !m.suffixlist || !m.buildlist ||
254 !m.mymanpath || !m.missinglist || !m.intmp)
255 errx(1, "malloc failed");
256
257 /*
258 * are we using a section whose elements are all absolute paths?
259 * (we only need to look at the first entry on the section list,
260 * as config() will ensure that any additional entries will match
261 * the first one.)
262 */
263 abs_section = (m.section != NULL &&
264 !TAILQ_EMPTY(&m.section->entrylist) &&
265 *(TAILQ_FIRST(&m.section->entrylist)->s) == '/');
266
267 /*
268 * now that we have all the data we need, we must determine the
269 * manpath we are going to use to find the requested entries using
270 * the following steps...
271 *
272 * [1] if the user specified a section and that section's elements
273 * from the config file are all absolute paths, then we override
274 * defaultpath and -M/MANPATH with the section's absolute paths.
275 */
276 if (abs_section) {
277 m.manpath = NULL; /* ignore -M/MANPATH */
278 m.defaultpath = m.section; /* overwrite _default path */
279 m.section = NULL; /* promoted to defaultpath */
280 }
281
282 /*
283 * [2] section can now only be non-null if the user asked for
284 * a section and that section's elements did not have
285 * absolute paths. in this case we use the section's
286 * elements to override _subdir from the config file.
287 *
288 * after this step, we are done processing "m.section"...
289 */
290 if (m.section)
291 m.subdirs = m.section;
292
293 /*
294 * [3] we need to setup the path we want to use (m.mymanpath).
295 * if the user gave us a path (m.manpath) use it, otherwise
296 * go with the default. in either case we need to append
297 * the subdir and machine spec to each element of the path.
298 *
299 * for absolute section paths that come from the config file,
300 * we only append the subdir spec if the path ends in
301 * a '/' --- elements that do not end in '/' are assumed to
302 * not have subdirectories. this is mainly for backward compat,
303 * but it allows non-subdir configs like:
304 * sect3 /usr/share/man/{old/,}cat3
305 * doc /usr/{pkg,share}/doc/{sendmail/op,sendmail/intro}
306 *
307 * note that we try and be careful to not put double slashes
308 * in the path (e.g. we want /usr/share/man/man1, not
309 * /usr/share/man//man1) because "more" will put the filename
310 * we generate in its prompt and the double slashes look ugly.
311 */
312 if (m.manpath) {
313
314 /* note: strtok is going to destroy m.manpath */
315 for (p = strtok(m.manpath, ":") ; p ; p = strtok(NULL, ":")) {
316 len = strlen(p);
317 if (len < 1)
318 continue;
319 TAILQ_FOREACH(esubd, &m.subdirs->entrylist, q) {
320 snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
321 p, (p[len-1] == '/') ? "" : "/",
322 esubd->s, machine);
323 if (addentry(m.mymanpath, buf, 0) < 0)
324 errx(1, "malloc failed");
325 }
326 }
327
328 } else {
329
330 TAILQ_FOREACH(epath, &m.defaultpath->entrylist, q) {
331 /* handle trailing "/" magic here ... */
332 if (abs_section &&
333 epath->s[epath->len - 1] != '/') {
334
335 (void)snprintf(buf, sizeof(buf),
336 "%s{/%s,}", epath->s, machine);
337 if (addentry(m.mymanpath, buf, 0) < 0)
338 errx(1, "malloc failed");
339 continue;
340 }
341
342 TAILQ_FOREACH(esubd, &m.subdirs->entrylist, q) {
343 snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
344 epath->s,
345 (epath->s[epath->len-1] == '/') ? ""
346 : "/",
347 esubd->s, machine);
348 if (addentry(m.mymanpath, buf, 0) < 0)
349 errx(1, "malloc failed");
350 }
351 }
352
353 }
354
355 /*
356 * [4] finally, prepend the "-m" m.addpath to mymanpath if it
357 * was specified. subdirs and machine are always applied to
358 * m.addpath.
359 */
360 if (m.addpath) {
361
362 /* note: strtok is going to destroy m.addpath */
363 for (p = strtok(m.addpath, ":") ; p ; p = strtok(NULL, ":")) {
364 len = strlen(p);
365 if (len < 1)
366 continue;
367 TAILQ_FOREACH(esubd, &m.subdirs->entrylist, q) {
368 snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
369 p, (p[len-1] == '/') ? "" : "/",
370 esubd->s, machine);
371 /* add at front */
372 if (addentry(m.mymanpath, buf, 1) < 0)
373 errx(1, "malloc failed");
374 }
375 }
376
377 }
378
379 /*
380 * now m.mymanpath is complete!
381 */
382 #if MAN_DEBUG
383 printf("mymanpath:\n");
384 TAILQ_FOREACH(epath, &m.mymanpath->entrylist, q) {
385 printf("\t%s\n", epath->s);
386 }
387 #endif
388
389 /*
390 * start searching for matching files and format them if necessary.
391 * setup an interrupt handler so that we can ensure that temporary
392 * files go away.
393 */
394 (void)signal(SIGINT, onsig);
395 (void)signal(SIGHUP, onsig);
396 (void)signal(SIGPIPE, onsig);
397
398 memset(&pg, 0, sizeof(pg));
399 for (found = 0; *argv; ++argv)
400 if (manual(*argv, &m, &pg)) {
401 found = 1;
402 }
403
404 /* if nothing found, we're done. */
405 if (!found) {
406 (void)cleanup();
407 exit (1);
408 }
409
410 /*
411 * handle the simple display cases first (m.cat, m.how, m.where)
412 */
413 if (m.cat) {
414 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
415 if (**ap == '\0')
416 continue;
417 cat(*ap);
418 }
419 exit (cleanup());
420 }
421 if (m.how) {
422 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
423 if (**ap == '\0')
424 continue;
425 how(*ap);
426 }
427 exit(cleanup());
428 }
429 if (m.where) {
430 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
431 if (**ap == '\0')
432 continue;
433 (void)printf("%s\n", *ap);
434 }
435 exit(cleanup());
436 }
437
438 /*
439 * normal case - we display things in a single command, so
440 * build a list of things to display. first compute total
441 * length of buffer we will need so we can malloc it.
442 */
443 for (ap = pg.gl_pathv, len = m.pagerlen + 1; *ap != NULL; ++ap) {
444 if (**ap == '\0')
445 continue;
446 len += strlen(*ap) + 1;
447 }
448 if ((cmd = malloc(len)) == NULL) {
449 warn("malloc");
450 (void)cleanup();
451 exit(1);
452 }
453
454 /* now build the command string... */
455 p = cmd;
456 len = m.pagerlen;
457 memcpy(p, m.pager, len);
458 p += len;
459 *p++ = ' ';
460 for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
461 if (**ap == '\0')
462 continue;
463 len = strlen(*ap);
464 memcpy(p, *ap, len);
465 p += len;
466 *p++ = ' ';
467 }
468 *--p = '\0';
469
470 /* Use system(3) in case someone's pager is "pager arg1 arg2". */
471 (void)system(cmd);
472
473 exit(cleanup());
474 }
475
476 /*
477 * manual --
478 * Search the manuals for the pages.
479 */
480 static int
481 manual(char *page, struct manstate *mp, glob_t *pg)
482 {
483 ENTRY *suffix, *mdir;
484 int anyfound, error, found;
485 size_t cnt;
486 char *p, buf[MAXPATHLEN], *escpage, *eptr;
487 static const char escglob[] = "\\~?*{}[]";
488
489 anyfound = 0;
490
491 /*
492 * Fixup page which may contain glob(3) special characters, e.g.
493 * the famous "No man page for [" FAQ.
494 */
495 if ((escpage = malloc((2 * strlen(page)) + 1)) == NULL) {
496 warn("malloc");
497 (void)cleanup();
498 exit(1);
499 }
500
501 p = page;
502 eptr = escpage;
503
504 while (*p) {
505 if (strchr(escglob, *p) != NULL) {
506 *eptr++ = '\\';
507 *eptr++ = *p++;
508 } else
509 *eptr++ = *p++;
510 }
511
512 *eptr = '\0';
513
514 /* For each man directory in mymanpath ... */
515 TAILQ_FOREACH(mdir, &mp->mymanpath->entrylist, q) {
516
517 /*
518 * use glob(3) to look in the filesystem for matching files.
519 * match any suffix here, as we will check that later.
520 */
521 (void)snprintf(buf, sizeof(buf), "%s/%s.*", mdir->s, escpage);
522 if ((error = glob(buf,
523 GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT, NULL, pg)) != 0) {
524 if (error == GLOB_NOMATCH)
525 continue;
526 else {
527 warn("globbing");
528 (void)cleanup();
529 exit(1);
530 }
531 }
532 if (pg->gl_matchc == 0)
533 continue;
534
535 /*
536 * start going through the matches glob(3) just found and
537 * use m.pathsearch (if present) to filter out pages we
538 * don't want. then verify the suffix is valid, and build
539 * the page if we have a _build suffix.
540 */
541 for (cnt = pg->gl_pathc - pg->gl_matchc;
542 cnt < pg->gl_pathc; ++cnt) {
543
544 /* filter on directory path name */
545 if (mp->pathsearch) {
546 p = strstr(pg->gl_pathv[cnt], mp->pathsearch);
547 if (!p || strchr(p, '/') == NULL) {
548 pg->gl_pathv[cnt] = ""; /* zap! */
549 continue;
550 }
551 }
552
553 /*
554 * Try the _suffix key words first.
555 *
556 * XXX
557 * Older versions of man.conf didn't have the suffix
558 * key words, it was assumed that everything was a .0.
559 * We just test for .0 first, it's fast and probably
560 * going to hit.
561 */
562 (void)snprintf(buf, sizeof(buf), "*/%s.0", escpage);
563 if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
564 goto next;
565
566 found = 0;
567 TAILQ_FOREACH(suffix, &mp->suffixlist->entrylist, q) {
568 (void)snprintf(buf,
569 sizeof(buf), "*/%s%s", escpage,
570 suffix->s);
571 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
572 found = 1;
573 break;
574 }
575 }
576 if (found)
577 goto next;
578
579 /* Try the _build key words next. */
580 found = 0;
581 TAILQ_FOREACH(suffix, &mp->buildlist->entrylist, q) {
582 for (p = suffix->s;
583 *p != '\0' && !isspace((unsigned char)*p);
584 ++p)
585 continue;
586 if (*p == '\0')
587 continue;
588 *p = '\0';
589 (void)snprintf(buf,
590 sizeof(buf), "*/%s%s", escpage,
591 suffix->s);
592 if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
593 if (!mp->where)
594 build_page(p + 1,
595 &pg->gl_pathv[cnt], mp);
596 *p = ' ';
597 found = 1;
598 break;
599 }
600 *p = ' ';
601 }
602 if (found) {
603 next: anyfound = 1;
604 if (!mp->all) {
605 /* Delete any other matches. */
606 while (++cnt< pg->gl_pathc)
607 pg->gl_pathv[cnt] = "";
608 break;
609 }
610 continue;
611 }
612
613 /* It's not a man page, forget about it. */
614 pg->gl_pathv[cnt] = "";
615 }
616
617 if (anyfound && !mp->all)
618 break;
619 }
620
621 /* If not found, enter onto the missing list. */
622 if (!anyfound) {
623 if (addentry(mp->missinglist, page, 0) < 0) {
624 warn("malloc");
625 (void)cleanup();
626 exit(1);
627 }
628 }
629
630 free(escpage);
631 return (anyfound);
632 }
633
634 /*
635 * build_page --
636 * Build a man page for display.
637 */
638 static void
639 build_page(char *fmt, char **pathp, struct manstate *mp)
640 {
641 static int warned;
642 int olddir, fd, n, tmpdirlen;
643 char *p, *b;
644 char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[MAXPATHLEN];
645 const char *tmpdir;
646
647 /* Let the user know this may take awhile. */
648 if (!warned) {
649 warned = 1;
650 warnx("Formatting manual page...");
651 }
652
653 /*
654 * Historically man chdir'd to the root of the man tree.
655 * This was used in man pages that contained relative ".so"
656 * directives (including other man pages for command aliases etc.)
657 * It even went one step farther, by examining the first line
658 * of the man page and parsing the .so filename so it would
659 * make hard(?) links to the cat'ted man pages for space savings.
660 * (We don't do that here, but we could).
661 */
662
663 /* copy and find the end */
664 for (b = buf, p = *pathp; (*b++ = *p++) != '\0';)
665 continue;
666
667 /*
668 * skip the last two path components, page name and man[n] ...
669 * (e.g. buf will be "/usr/share/man" and p will be "man1/man.1")
670 * we also save a pointer to our current directory so that we
671 * can fchdir() back to it. this allows relative MANDIR paths
672 * to work with multiple man pages... e.g. consider:
673 * cd /usr/share && man -M ./man cat ls
674 * when no "cat1" subdir files are present.
675 */
676 olddir = -1;
677 for (--b, --p, n = 2; b != buf; b--, p--)
678 if (*b == '/')
679 if (--n == 0) {
680 *b = '\0';
681 olddir = open(".", O_RDONLY);
682 (void) chdir(buf);
683 p++;
684 break;
685 }
686
687
688 /* advance fmt pass the suffix spec to the printf format string */
689 for (; *fmt && isspace((unsigned char)*fmt); ++fmt)
690 continue;
691
692 /*
693 * Get a temporary file and build a version of the file
694 * to display. Replace the old file name with the new one.
695 */
696 if ((tmpdir = getenv("TMPDIR")) == NULL)
697 tmpdir = _PATH_TMP;
698 tmpdirlen = strlen(tmpdir);
699 (void)snprintf(tpath, sizeof (tpath), "%s%s%s", tmpdir,
700 (tmpdirlen && tmpdir[tmpdirlen-1] == '/') ? "" : "/", TMPFILE);
701 if ((fd = mkstemp(tpath)) == -1) {
702 warn("%s", tpath);
703 (void)cleanup();
704 exit(1);
705 }
706 (void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
707 (void)snprintf(cmd, sizeof(cmd), buf, p);
708 (void)system(cmd);
709 (void)close(fd);
710 if ((*pathp = strdup(tpath)) == NULL) {
711 warn("malloc");
712 (void)cleanup();
713 exit(1);
714 }
715
716 /* Link the built file into the remove-when-done list. */
717 if (addentry(mp->intmp, *pathp, 0) < 0) {
718 warn("malloc");
719 (void)cleanup();
720 exit(1);
721 }
722
723 /* restore old directory so relative manpaths still work */
724 if (olddir != -1) {
725 fchdir(olddir);
726 close(olddir);
727 }
728 }
729
730 /*
731 * how --
732 * display how information
733 */
734 static void
735 how(char *fname)
736 {
737 FILE *fp;
738
739 int lcnt, print;
740 char *p, buf[256];
741
742 if (!(fp = fopen(fname, "r"))) {
743 warn("%s", fname);
744 (void)cleanup();
745 exit (1);
746 }
747 #define S1 "SYNOPSIS"
748 #define S2 "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
749 #define D1 "DESCRIPTION"
750 #define D2 "D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
751 for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
752 if (!strncmp(buf, S1, sizeof(S1) - 1) ||
753 !strncmp(buf, S2, sizeof(S2) - 1)) {
754 print = 1;
755 continue;
756 } else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
757 !strncmp(buf, D2, sizeof(D2) - 1)) {
758 if (fp)
759 (void)fclose(fp);
760 return;
761 }
762 if (!print)
763 continue;
764 if (*buf == '\n')
765 ++lcnt;
766 else {
767 for(; lcnt; --lcnt)
768 (void)putchar('\n');
769 for (p = buf; isspace((unsigned char)*p); ++p)
770 continue;
771 (void)fputs(p, stdout);
772 }
773 }
774 (void)fclose(fp);
775 }
776
777 /*
778 * cat --
779 * cat out the file
780 */
781 static void
782 cat(char *fname)
783 {
784 int fd, n;
785 char buf[2048];
786
787 if ((fd = open(fname, O_RDONLY, 0)) < 0) {
788 warn("%s", fname);
789 (void)cleanup();
790 exit(1);
791 }
792 while ((n = read(fd, buf, sizeof(buf))) > 0)
793 if (write(STDOUT_FILENO, buf, n) != n) {
794 warn("write");
795 (void)cleanup();
796 exit (1);
797 }
798 if (n == -1) {
799 warn("read");
800 (void)cleanup();
801 exit(1);
802 }
803 (void)close(fd);
804 }
805
806 /*
807 * check_pager --
808 * check the user supplied page information
809 */
810 static const char *
811 check_pager(const char *name)
812 {
813 const char *p;
814
815 /*
816 * if the user uses "more", we make it "more -s"; watch out for
817 * PAGER = "mypager /usr/ucb/more"
818 */
819 for (p = name; *p && !isspace((unsigned char)*p); ++p)
820 continue;
821 for (; p > name && *p != '/'; --p);
822 if (p != name)
823 ++p;
824
825 /* make sure it's "more", not "morex" */
826 if (!strncmp(p, "more", 4) && (!p[4] || isspace((unsigned char)p[4]))){
827 char *newname;
828 (void)asprintf(&newname, "%s %s", p, "-s");
829 name = newname;
830 }
831
832 return (name);
833 }
834
835 /*
836 * jump --
837 * strip out flag argument and jump
838 */
839 static void
840 jump(char **argv, char *flag, char *name)
841 {
842 char **arg;
843
844 argv[0] = name;
845 for (arg = argv + 1; *arg; ++arg)
846 if (!strcmp(*arg, flag))
847 break;
848 for (; *arg; ++arg)
849 arg[0] = arg[1];
850 execvp(name, argv);
851 (void)fprintf(stderr, "%s: Command not found.\n", name);
852 exit(1);
853 }
854
855 /*
856 * onsig --
857 * If signaled, delete the temporary files.
858 */
859 static void
860 onsig(int signo)
861 {
862
863 (void)cleanup();
864
865 (void)raise_default_signal(signo);
866
867 /* NOTREACHED */
868 exit (1);
869 }
870
871 /*
872 * cleanup --
873 * Clean up temporary files, show any error messages.
874 */
875 static int
876 cleanup()
877 {
878 TAG *intmpp, *missp;
879 ENTRY *ep;
880 int rval;
881
882 rval = 0;
883 /*
884 * note that _missing and _intmp were created by main(), so
885 * gettag() cannot return NULL here.
886 */
887 missp = gettag("_missing", 0); /* missing man pages */
888 intmpp = gettag("_intmp", 0); /* tmp files we need to unlink */
889
890 TAILQ_FOREACH(ep, &missp->entrylist, q) {
891 warnx("no entry for %s in the manual.", ep->s);
892 rval = 1;
893 }
894
895 TAILQ_FOREACH(ep, &intmpp->entrylist, q)
896 (void)unlink(ep->s);
897
898 return (rval);
899 }
900
901 /*
902 * usage --
903 * print usage message and die
904 */
905 static void
906 usage()
907 {
908 (void)fprintf(stderr, "usage: %s [-acw|-h] [-C cfg] [-M path] "
909 "[-m path] [-S srch] [[-s] sect] name ...\n", getprogname());
910 (void)fprintf(stderr,
911 "usage: %s -k [-C cfg] [-M path] [-m path] keyword ...\n",
912 getprogname());
913 exit(1);
914 }
915