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man.c revision 1.15.2.3
      1 /*	$NetBSD: man.c,v 1.15.2.3 2000/04/30 11:27:57 he 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 1.15.2.3 2000/04/30 11:27:57 he Exp $");
     48 #endif
     49 #endif /* not lint */
     50 
     51 #include <sys/param.h>
     52 #include <sys/queue.h>
     53 #include <sys/utsname.h>
     54 
     55 #include <ctype.h>
     56 #include <err.h>
     57 #include <errno.h>
     58 #include <fcntl.h>
     59 #include <fnmatch.h>
     60 #include <glob.h>
     61 #include <signal.h>
     62 #include <stdio.h>
     63 #include <stdlib.h>
     64 #include <string.h>
     65 #include <unistd.h>
     66 
     67 #include "config.h"
     68 #include "pathnames.h"
     69 
     70 int f_all, f_where;
     71 
     72 int		 main __P((int, char **));
     73 static void	 build_page __P((char *, char **));
     74 static void	 cat __P((char *));
     75 static char	*check_pager __P((char *));
     76 static int	 cleanup __P((void));
     77 static void	 how __P((char *));
     78 static void	 jump __P((char **, char *, char *));
     79 static int	 manual __P((char *, TAG *, glob_t *));
     80 static void	 onsig __P((int));
     81 static void	 usage __P((void));
     82 
     83 int
     84 main(argc, argv)
     85 	int argc;
     86 	char *argv[];
     87 {
     88 	TAG *defp, *defnewp, *section, *sectnewp, *subp;
     89 	ENTRY *e_defp, *e_sectp, *e_subp, *ep;
     90 	glob_t pg;
     91 	size_t len;
     92 	int ch, f_cat, f_how, found;
     93 	char **ap, *cmd, *machine, *p, *p_add, *p_path, *pager, *slashp;
     94 	char *conffile, buf[MAXPATHLEN * 2];
     95 
     96 #ifdef __GNUC__
     97 	pager = NULL;		/* XXX gcc -Wuninitialized */
     98 #endif
     99 
    100 	f_cat = f_how = 0;
    101 	conffile = p_add = p_path = NULL;
    102 	while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:w")) != -1)
    103 		switch (ch) {
    104 		case 'a':
    105 			f_all = 1;
    106 			break;
    107 		case 'C':
    108 			conffile = optarg;
    109 			break;
    110 		case 'c':
    111 		case '-':		/* Deprecated. */
    112 			f_cat = 1;
    113 			break;
    114 		case 'h':
    115 			f_how = 1;
    116 			break;
    117 		case 'm':
    118 			p_add = optarg;
    119 			break;
    120 		case 'M':
    121 		case 'P':		/* Backward compatibility. */
    122 			p_path = optarg;
    123 			break;
    124 		/*
    125 		 * The -f and -k options are backward compatible,
    126 		 * undocumented ways of calling whatis(1) and apropos(1).
    127 		 */
    128 		case 'f':
    129 			jump(argv, "-f", "whatis");
    130 			/* NOTREACHED */
    131 		case 'k':
    132 			jump(argv, "-k", "apropos");
    133 			/* NOTREACHED */
    134 		case 'w':
    135 			f_all = f_where = 1;
    136 			break;
    137 		case '?':
    138 		default:
    139 			usage();
    140 		}
    141 	argc -= optind;
    142 	argv += optind;
    143 
    144 	if (!*argv)
    145 		usage();
    146 
    147 	if (!f_cat && !f_how && !f_where) {
    148 		if (!isatty(STDOUT_FILENO)) {
    149 			f_cat = 1;
    150 		} else {
    151 			if ((pager = getenv("PAGER")) != NULL &&
    152 			    pager[0] != '\0')
    153 				pager = check_pager(pager);
    154 			else
    155 				pager = _PATH_PAGER;
    156 		}
    157 	}
    158 	/* Read the configuration file. */
    159 	config(conffile);
    160 
    161 	/* Get the machine type. */
    162 	if ((machine = getenv("MACHINE")) == NULL) {
    163 		struct utsname utsname;
    164 
    165 		if (uname(&utsname) == -1) {
    166 			perror("uname");
    167 			exit(1);
    168 		}
    169 		machine = utsname.machine;
    170 	}
    171 
    172 	/* If there's no _default list, create an empty one. */
    173 	if ((defp = getlist("_default")) == NULL)
    174 		defp = addlist("_default");
    175 
    176 	/*
    177 	 * 1: If the user specified a MANPATH variable, or set the -M
    178 	 *    option, we replace the _default list with the user's list,
    179 	 *    appending the entries in the _subdir list and the machine.
    180 	 */
    181 	if (p_path == NULL)
    182 		p_path = getenv("MANPATH");
    183 	if (p_path != NULL) {
    184 		while ((e_defp = defp->list.tqh_first) != NULL) {
    185 			free(e_defp->s);
    186 			TAILQ_REMOVE(&defp->list, e_defp, q);
    187 		}
    188 		for (p = strtok(p_path, ":");
    189 		    p != NULL; p = strtok(NULL, ":")) {
    190 			slashp = p[strlen(p) - 1] == '/' ? "" : "/";
    191 			e_subp = (subp = getlist("_subdir")) == NULL ?
    192 			    NULL : subp->list.tqh_first;
    193 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    194 				(void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    195 				    p, slashp, e_subp->s, machine);
    196 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    197 				    (ep->s = strdup(buf)) == NULL)
    198 					err(1, "malloc");
    199 				TAILQ_INSERT_TAIL(&defp->list, ep, q);
    200 			}
    201 		}
    202 	}
    203 
    204 	/*
    205 	 * 2: If the user did not specify MANPATH, -M or a section, rewrite
    206 	 *    the _default list to include the _subdir list and the machine.
    207 	 */
    208 	if (argv[1] == NULL)
    209 		section = NULL;
    210 	else if ((section = getlist(*argv)) != NULL)
    211 		++argv;
    212 	if (p_path == NULL && section == NULL) {
    213 		defnewp = addlist("_default_new");
    214 		e_defp =
    215 		    defp->list.tqh_first == NULL ? NULL : defp->list.tqh_first;
    216 		for (; e_defp != NULL; e_defp = e_defp->q.tqe_next) {
    217 			slashp =
    218 			    e_defp->s[strlen(e_defp->s) - 1] == '/' ? "" : "/";
    219 			e_subp = (subp = getlist("_subdir")) == NULL ?
    220 			    NULL : subp->list.tqh_first;
    221 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    222 				(void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    223 				e_defp->s, slashp, e_subp->s, machine);
    224 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    225 				    (ep->s = strdup(buf)) == NULL)
    226 					err(1, "malloc");
    227 				TAILQ_INSERT_TAIL(&defnewp->list, ep, q);
    228 			}
    229 		}
    230 		defp = getlist("_default");
    231 		while ((e_defp = defp->list.tqh_first) != NULL) {
    232 			free(e_defp->s);
    233 			TAILQ_REMOVE(&defp->list, e_defp, q);
    234 		}
    235 		free(defp->s);
    236 		TAILQ_REMOVE(&head, defp, q);
    237 		defnewp = getlist("_default_new");
    238 		free(defnewp->s);
    239 		defnewp->s = "_default";
    240 		defp = defnewp;
    241 	}
    242 
    243 	/*
    244 	 * 3: If the user set the -m option, insert the user's list before
    245 	 *    whatever list we have, again appending the _subdir list and
    246 	 *    the machine.
    247 	 */
    248 	if (p_add != NULL)
    249 		for (p = strtok(p_add, ":"); p != NULL; p = strtok(NULL, ":")) {
    250 			slashp = p[strlen(p) - 1] == '/' ? "" : "/";
    251 			e_subp = (subp = getlist("_subdir")) == NULL ?
    252 			    NULL : subp->list.tqh_first;
    253 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    254 				(void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    255 				    p, slashp, e_subp->s, machine);
    256 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    257 				    (ep->s = strdup(buf)) == NULL)
    258 					err(1, "malloc");
    259 				TAILQ_INSERT_HEAD(&defp->list, ep, q);
    260 			}
    261 		}
    262 
    263 	/*
    264 	 * 4: If no -m was specified, and a section was, rewrite the section's
    265 	 *    paths (if they have a trailing slash) to append the _subdir list
    266 	 *    and the machine.  This then becomes the _default list.
    267 	 */
    268 	if (p_add == NULL && section != NULL) {
    269 		sectnewp = addlist("_section_new");
    270 		for (e_sectp = section->list.tqh_first;
    271 		    e_sectp != NULL; e_sectp = e_sectp->q.tqe_next) {
    272 			if (e_sectp->s[strlen(e_sectp->s) - 1] != '/') {
    273 				(void)snprintf(buf, sizeof(buf),
    274 				    "%s{/%s,}", e_sectp->s, machine);
    275 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    276 				    (ep->s = strdup(buf)) == NULL)
    277 					err(1, "malloc");
    278 				TAILQ_INSERT_TAIL(&sectnewp->list, ep, q);
    279 				continue;
    280 			}
    281 			e_subp = (subp = getlist("_subdir")) == NULL ?
    282 			    NULL : subp->list.tqh_first;
    283 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    284 				(void)snprintf(buf, sizeof(buf), "%s%s{/%s,}",
    285 				    e_sectp->s, e_subp->s, machine);
    286 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    287 				    (ep->s = strdup(buf)) == NULL)
    288 					err(1, "malloc");
    289 				TAILQ_INSERT_TAIL(&sectnewp->list, ep, q);
    290 			}
    291 		}
    292 		sectnewp->s = section->s;
    293 		defp = sectnewp;
    294 		TAILQ_REMOVE(&head, section, q);
    295 	}
    296 
    297 	/*
    298 	 * 5: Search for the files.  Set up an interrupt handler, so the
    299 	 *    temporary files go away.
    300 	 */
    301 	(void)signal(SIGINT, onsig);
    302 	(void)signal(SIGHUP, onsig);
    303 	(void)signal(SIGPIPE, onsig);
    304 
    305 	memset(&pg, 0, sizeof(pg));
    306 	for (found = 0; *argv; ++argv)
    307 		if (manual(*argv, defp, &pg))
    308 			found = 1;
    309 
    310 	/* 6: If nothing found, we're done. */
    311 	if (!found) {
    312 		(void)cleanup();
    313 		exit (1);
    314 	}
    315 
    316 	/* 7: If it's simple, display it fast. */
    317 	if (f_cat) {
    318 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    319 			if (**ap == '\0')
    320 				continue;
    321 			cat(*ap);
    322 		}
    323 		exit (cleanup());
    324 	}
    325 	if (f_how) {
    326 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    327 			if (**ap == '\0')
    328 				continue;
    329 			how(*ap);
    330 		}
    331 		exit(cleanup());
    332 	}
    333 	if (f_where) {
    334 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    335 			if (**ap == '\0')
    336 				continue;
    337 			(void)printf("%s\n", *ap);
    338 		}
    339 		exit(cleanup());
    340 	}
    341 
    342 	/*
    343 	 * 8: We display things in a single command; build a list of things
    344 	 *    to display.
    345 	 */
    346 	for (ap = pg.gl_pathv, len = strlen(pager) + 1; *ap != NULL; ++ap) {
    347 		if (**ap == '\0')
    348 			continue;
    349 		len += strlen(*ap) + 1;
    350 	}
    351 	if ((cmd = malloc(len)) == NULL) {
    352 		warn("malloc");
    353 		(void)cleanup();
    354 		exit(1);
    355 	}
    356 	p = cmd;
    357 	len = strlen(pager);
    358 	memmove(p, pager, len);
    359 	p += len;
    360 	*p++ = ' ';
    361 	for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    362 		if (**ap == '\0')
    363 			continue;
    364 		len = strlen(*ap);
    365 		memmove(p, *ap, len);
    366 		p += len;
    367 		*p++ = ' ';
    368 	}
    369 	*--p = '\0';
    370 
    371 	/* Use system(3) in case someone's pager is "pager arg1 arg2". */
    372 	(void)system(cmd);
    373 
    374 	exit(cleanup());
    375 }
    376 
    377 /*
    378  * manual --
    379  *	Search the manuals for the pages.
    380  */
    381 static int
    382 manual(page, tag, pg)
    383 	char *page;
    384 	TAG *tag;
    385 	glob_t *pg;
    386 {
    387 	ENTRY *ep, *e_sufp, *e_tag;
    388 	TAG *missp, *sufp;
    389 	int anyfound, cnt, error, found;
    390 	char *p, buf[MAXPATHLEN];
    391 
    392 	anyfound = 0;
    393 	buf[0] = '*';
    394 
    395 	/* For each element in the list... */
    396 	e_tag = tag == NULL ? NULL : tag->list.tqh_first;
    397 	for (; e_tag != NULL; e_tag = e_tag->q.tqe_next) {
    398 		(void)snprintf(buf, sizeof(buf), "%s/%s.*", e_tag->s, page);
    399 		if ((error = glob(buf,
    400 		    GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT, NULL, pg)) != 0) {
    401 			if (error == GLOB_NOMATCH)
    402 				continue;
    403 			else {
    404 				warn("globbing");
    405 				(void)cleanup();
    406 				exit(1);
    407 			}
    408 		}
    409 		if (pg->gl_matchc == 0)
    410 			continue;
    411 
    412 		/* Find out if it's really a man page. */
    413 		for (cnt = pg->gl_pathc - pg->gl_matchc;
    414 		    cnt < pg->gl_pathc; ++cnt) {
    415 
    416 			/*
    417 			 * Try the _suffix key words first.
    418 			 *
    419 			 * XXX
    420 			 * Older versions of man.conf didn't have the suffix
    421 			 * key words, it was assumed that everything was a .0.
    422 			 * We just test for .0 first, it's fast and probably
    423 			 * going to hit.
    424 			 */
    425 			(void)snprintf(buf, sizeof(buf), "*/%s.0", page);
    426 			if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
    427 				goto next;
    428 
    429 			e_sufp = (sufp = getlist("_suffix")) == NULL ?
    430 			    NULL : sufp->list.tqh_first;
    431 			for (found = 0;
    432 			    e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
    433 				(void)snprintf(buf,
    434 				     sizeof(buf), "*/%s%s", page, e_sufp->s);
    435 				if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
    436 					found = 1;
    437 					break;
    438 				}
    439 			}
    440 			if (found)
    441 				goto next;
    442 
    443 			/* Try the _build key words next. */
    444 			e_sufp = (sufp = getlist("_build")) == NULL ?
    445 			    NULL : sufp->list.tqh_first;
    446 			for (found = 0;
    447 			    e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
    448 				for (p = e_sufp->s;
    449 				    *p != '\0' && !isspace((unsigned char)*p); ++p);
    450 				if (*p == '\0')
    451 					continue;
    452 				*p = '\0';
    453 				(void)snprintf(buf,
    454 				     sizeof(buf), "*/%s%s", page, e_sufp->s);
    455 				if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
    456 					if (!f_where)
    457 						build_page(p + 1,
    458 						    &pg->gl_pathv[cnt]);
    459 					*p = ' ';
    460 					found = 1;
    461 					break;
    462 				}
    463 				*p = ' ';
    464 			}
    465 			if (found) {
    466 next:				anyfound = 1;
    467 				if (!f_all) {
    468 					/* Delete any other matches. */
    469 					while (++cnt< pg->gl_pathc)
    470 						pg->gl_pathv[cnt] = "";
    471 					break;
    472 				}
    473 				continue;
    474 			}
    475 
    476 			/* It's not a man page, forget about it. */
    477 			pg->gl_pathv[cnt] = "";
    478 		}
    479 
    480 		if (anyfound && !f_all)
    481 			break;
    482 	}
    483 
    484 	/* If not found, enter onto the missing list. */
    485 	if (!anyfound) {
    486 		if ((missp = getlist("_missing")) == NULL)
    487 			missp = addlist("_missing");
    488 		if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    489 		    (ep->s = strdup(page)) == NULL) {
    490 			warn("malloc");
    491 			(void)cleanup();
    492 			exit(1);
    493 		}
    494 		TAILQ_INSERT_TAIL(&missp->list, ep, q);
    495 	}
    496 	return (anyfound);
    497 }
    498 
    499 /*
    500  * build_page --
    501  *	Build a man page for display.
    502  */
    503 static void
    504 build_page(fmt, pathp)
    505 	char *fmt, **pathp;
    506 {
    507 	static int warned;
    508 	ENTRY *ep;
    509 	TAG *intmpp;
    510 	int fd, n;
    511 	char *p, *b;
    512 	char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[MAXPATHLEN];
    513 	const char *tmpdir;
    514 
    515 	/* Let the user know this may take awhile. */
    516 	if (!warned) {
    517 		warned = 1;
    518 		warnx("Formatting manual page...");
    519 	}
    520 
    521        /*
    522         * Historically man chdir'd to the root of the man tree.
    523         * This was used in man pages that contained relative ".so"
    524         * directives (including other man pages for command aliases etc.)
    525         * It even went one step farther, by examining the first line
    526         * of the man page and parsing the .so filename so it would
    527         * make hard(?) links to the cat'ted man pages for space savings.
    528         * (We don't do that here, but we could).
    529         */
    530 
    531        /* copy and find the end */
    532        for (b = buf, p = *pathp; (*b++ = *p++) != '\0';)
    533                continue;
    534 
    535 	/* skip the last two path components, page name and man[n] */
    536 	for (--b, --p, n = 2; b != buf; b--, p--)
    537 		if (*b == '/')
    538 			if (--n == 0) {
    539 				*b = '\0';
    540 				(void) chdir(buf);
    541 				p++;
    542 				break;
    543 			}
    544 
    545 
    546 	/* Add a remove-when-done list. */
    547 	if ((intmpp = getlist("_intmp")) == NULL)
    548 		intmpp = addlist("_intmp");
    549 
    550 	/* Move to the printf(3) format string. */
    551 	for (; *fmt && isspace((unsigned char)*fmt); ++fmt)
    552 		continue;
    553 
    554 	/*
    555 	 * Get a temporary file and build a version of the file
    556 	 * to display.  Replace the old file name with the new one.
    557 	 */
    558 	if ((tmpdir = getenv("TMPDIR")) == NULL)
    559 		tmpdir = _PATH_TMP;
    560 	(void)snprintf(tpath, sizeof (tpath), "%s/%s", tmpdir, TMPFILE);
    561 	if ((fd = mkstemp(tpath)) == -1) {
    562 		warn("%s", tpath);
    563 		(void)cleanup();
    564 		exit(1);
    565 	}
    566 	(void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
    567 	(void)snprintf(cmd, sizeof(cmd), buf, p);
    568 	(void)system(cmd);
    569 	(void)close(fd);
    570 	if ((*pathp = strdup(tpath)) == NULL) {
    571 		warn("malloc");
    572 		(void)cleanup();
    573 		exit(1);
    574 	}
    575 
    576 	/* Link the built file into the remove-when-done list. */
    577 	if ((ep = malloc(sizeof(ENTRY))) == NULL) {
    578 		warn("malloc");
    579 		(void)cleanup();
    580 		exit(1);
    581 	}
    582 	ep->s = *pathp;
    583 	TAILQ_INSERT_TAIL(&intmpp->list, ep, q);
    584 }
    585 
    586 /*
    587  * how --
    588  *	display how information
    589  */
    590 static void
    591 how(fname)
    592 	char *fname;
    593 {
    594 	FILE *fp;
    595 
    596 	int lcnt, print;
    597 	char *p, buf[256];
    598 
    599 	if (!(fp = fopen(fname, "r"))) {
    600 		warn("%s", fname);
    601 		(void)cleanup();
    602 		exit (1);
    603 	}
    604 #define	S1	"SYNOPSIS"
    605 #define	S2	"S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
    606 #define	D1	"DESCRIPTION"
    607 #define	D2	"D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
    608 	for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
    609 		if (!strncmp(buf, S1, sizeof(S1) - 1) ||
    610 		    !strncmp(buf, S2, sizeof(S2) - 1)) {
    611 			print = 1;
    612 			continue;
    613 		} else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
    614 		    !strncmp(buf, D2, sizeof(D2) - 1))
    615 			return;
    616 		if (!print)
    617 			continue;
    618 		if (*buf == '\n')
    619 			++lcnt;
    620 		else {
    621 			for(; lcnt; --lcnt)
    622 				(void)putchar('\n');
    623 			for (p = buf; isspace((unsigned char)*p); ++p)
    624 				continue;
    625 			(void)fputs(p, stdout);
    626 		}
    627 	}
    628 	(void)fclose(fp);
    629 }
    630 
    631 /*
    632  * cat --
    633  *	cat out the file
    634  */
    635 static void
    636 cat(fname)
    637 	char *fname;
    638 {
    639 	int fd, n;
    640 	char buf[2048];
    641 
    642 	if ((fd = open(fname, O_RDONLY, 0)) < 0) {
    643 		warn("%s", fname);
    644 		(void)cleanup();
    645 		exit(1);
    646 	}
    647 	while ((n = read(fd, buf, sizeof(buf))) > 0)
    648 		if (write(STDOUT_FILENO, buf, n) != n) {
    649 			warn("write");
    650 			(void)cleanup();
    651 			exit (1);
    652 		}
    653 	if (n == -1) {
    654 		warn("read");
    655 		(void)cleanup();
    656 		exit(1);
    657 	}
    658 	(void)close(fd);
    659 }
    660 
    661 /*
    662  * check_pager --
    663  *	check the user supplied page information
    664  */
    665 static char *
    666 check_pager(name)
    667 	char *name;
    668 {
    669 	char *p, *save;
    670 
    671 	/*
    672 	 * if the user uses "more", we make it "more -s"; watch out for
    673 	 * PAGER = "mypager /usr/ucb/more"
    674 	 */
    675 	for (p = name; *p && !isspace((unsigned char)*p); ++p)
    676 		continue;
    677 	for (; p > name && *p != '/'; --p);
    678 	if (p != name)
    679 		++p;
    680 
    681 	/* make sure it's "more", not "morex" */
    682 	if (!strncmp(p, "more", 4) && (!p[4] || isspace((unsigned char)p[4]))){
    683 		save = name;
    684 		/* allocate space to add the "-s" */
    685 		if (!(name =
    686 		    malloc((u_int)(strlen(save) + sizeof("-s") + 1))))
    687 			err(1, "malloc");
    688 		(void)sprintf(name, "%s %s", save, "-s");
    689 	}
    690 	return(name);
    691 }
    692 
    693 /*
    694  * jump --
    695  *	strip out flag argument and jump
    696  */
    697 static void
    698 jump(argv, flag, name)
    699 	char **argv, *flag, *name;
    700 {
    701 	char **arg;
    702 
    703 	argv[0] = name;
    704 	for (arg = argv + 1; *arg; ++arg)
    705 		if (!strcmp(*arg, flag))
    706 			break;
    707 	for (; *arg; ++arg)
    708 		arg[0] = arg[1];
    709 	execvp(name, argv);
    710 	(void)fprintf(stderr, "%s: Command not found.\n", name);
    711 	exit(1);
    712 }
    713 
    714 /*
    715  * onsig --
    716  *	If signaled, delete the temporary files.
    717  */
    718 static void
    719 onsig(signo)
    720 	int signo;
    721 {
    722 	sigset_t set;
    723 
    724 	(void)cleanup();
    725 
    726 	(void)signal(signo, SIG_DFL);
    727 
    728 	/* unblock the signal */
    729 	sigemptyset(&set);
    730 	sigaddset(&set, signo);
    731 	sigprocmask(SIG_UNBLOCK, &set, (sigset_t *) NULL);
    732 
    733 	(void)kill(getpid(), signo);
    734 
    735 	/* NOTREACHED */
    736 	exit (1);
    737 }
    738 
    739 /*
    740  * cleanup --
    741  *	Clean up temporary files, show any error messages.
    742  */
    743 static int
    744 cleanup()
    745 {
    746 	TAG *intmpp, *missp;
    747 	ENTRY *ep;
    748 	int rval;
    749 
    750 	rval = 0;
    751 	ep = (missp = getlist("_missing")) == NULL ?
    752 	    NULL : missp->list.tqh_first;
    753 	if (ep != NULL)
    754 		for (; ep != NULL; ep = ep->q.tqe_next) {
    755 			warnx("no entry for %s in the manual.", ep->s);
    756 			rval = 1;
    757 		}
    758 
    759 	ep = (intmpp = getlist("_intmp")) == NULL ?
    760 	    NULL : intmpp->list.tqh_first;
    761 	for (; ep != NULL; ep = ep->q.tqe_next)
    762 		(void)unlink(ep->s);
    763 	return (rval);
    764 }
    765 
    766 /*
    767  * usage --
    768  *	print usage message and die
    769  */
    770 static void
    771 usage()
    772 {
    773 	extern char *__progname;
    774 	(void)fprintf(stderr,
    775     "Usage: %s [-achw] [-C file] [-M path] [-m path] [section] title ...\n",
    776 	    __progname);
    777 	exit(1);
    778 }
    779