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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(&sectnewp->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(&sectnewp->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