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man.c revision 1.26
      1 /*	$NetBSD: man.c,v 1.26 2001/02/19 23:03:49 cgd 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 1.26 2001/02/19 23:03:49 cgd 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 const char	*check_pager __P((const 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 *, const char *));
     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, *section, *newpathp, *subp;
     89 	ENTRY *e_defp, *e_subp;
     90 	glob_t pg;
     91 	size_t len;
     92 	int ch, f_cat, f_how, found, abs_section;
     93 	char **ap, *cmd, *p, *p_add, *p_path;
     94 	const char *machine, *pager, *conffile, *pathsearch, *sectionname;
     95 	char buf[MAXPATHLEN * 2];
     96 
     97 #ifdef __GNUC__
     98 	pager = NULL;		/* XXX gcc -Wuninitialized */
     99 #endif
    100 
    101 	f_cat = f_how = 0;
    102 	sectionname = pathsearch = conffile = p_add = p_path = NULL;
    103 	while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:s:S:w")) != -1)
    104 		switch (ch) {
    105 		case 'a':
    106 			f_all = 1;
    107 			break;
    108 		case 'C':
    109 			conffile = optarg;
    110 			break;
    111 		case 'c':
    112 		case '-':		/* Deprecated. */
    113 			f_cat = 1;
    114 			break;
    115 		case 'h':
    116 			f_how = 1;
    117 			break;
    118 		case 'm':
    119 			p_add = optarg;
    120 			break;
    121 		case 'M':
    122 		case 'P':		/* Backward compatibility. */
    123 			p_path = strdup(optarg);
    124 			break;
    125 		/*
    126 		 * The -f and -k options are backward compatible,
    127 		 * undocumented ways of calling whatis(1) and apropos(1).
    128 		 */
    129 		case 'f':
    130 			jump(argv, "-f", "whatis");
    131 			/* NOTREACHED */
    132 		case 'k':
    133 			jump(argv, "-k", "apropos");
    134 			/* NOTREACHED */
    135 		case 's':
    136 			if (sectionname != NULL)
    137 				usage();
    138 			sectionname = optarg;
    139 			break;
    140 		case 'S':
    141 			pathsearch = optarg;
    142 			break;
    143 		case 'w':
    144 			f_all = f_where = 1;
    145 			break;
    146 		case '?':
    147 		default:
    148 			usage();
    149 		}
    150 	argc -= optind;
    151 	argv += optind;
    152 
    153 	if (!argc)
    154 		usage();
    155 
    156 	if (!f_cat && !f_how && !f_where) {
    157 		if (!isatty(STDOUT_FILENO)) {
    158 			f_cat = 1;
    159 		} else {
    160 			if ((pager = getenv("PAGER")) != NULL &&
    161 			    pager[0] != '\0')
    162 				pager = check_pager(pager);
    163 			else
    164 				pager = _PATH_PAGER;
    165 		}
    166 	}
    167 
    168 	/* Read the configuration file. */
    169 	config(conffile);
    170 
    171 	/* Get the machine type. */
    172 	if ((machine = getenv("MACHINE")) == NULL) {
    173 		struct utsname utsname;
    174 
    175 		if (uname(&utsname) == -1) {
    176 			perror("uname");
    177 			exit(1);
    178 		}
    179 		machine = utsname.machine;
    180 	}
    181 
    182 	/* create an empty _default list if the config file didn't have one */
    183 	if ((defp = getlist("_default")) == NULL)
    184 		defp = addlist("_default");
    185 
    186 	/* if -M wasn't specified, check for MANPATH */
    187 	if (p_path == NULL)
    188 		p_path = getenv("MANPATH");
    189 
    190 	/*
    191 	 * get section.  abs_section will be non-zero iff the user
    192 	 * specified a section and it had absolute (rather than
    193 	 * relative) paths in the man.conf file.
    194 	 */
    195 	if ((argc > 1 || sectionname != NULL) &&
    196 	    (section = getlist(sectionname ? sectionname : *argv)) != NULL) {
    197 		if (sectionname == NULL) {
    198 			argv++;
    199 			argc--;
    200 		}
    201 		abs_section = (TAILQ_FIRST(&section->list) != NULL &&
    202 		    *(TAILQ_FIRST(&section->list)->s) == '/');
    203 	} else {
    204 		section = NULL;
    205 		abs_section = 0;
    206 	}
    207 
    208 	/* get subdir list */
    209 	subp = getlist("_subdir");
    210 	if (!subp)
    211 		subp = addlist("_subdir");
    212 
    213 	/*
    214 	 * now that we have all the inputs we must generate a search path.
    215 	 */
    216 
    217 	/*
    218 	 * 1: If user specified a section and it has absolute paths
    219 	 * in the config file, then that overrides _default, MANPATH and
    220 	 * path passed via -M.
    221 	 */
    222 	if (abs_section) {
    223 		p_path = NULL;		/* zap -M/MANPATH */
    224 		defp = section;		/* zap _default */
    225 		section = NULL;		/* promoted to defp */
    226 	}
    227 
    228 
    229 	/*
    230 	 * 2: Section can be non-null only if a section was specified
    231 	 * and the config file has relative paths - the section list
    232 	 * overrides _subdir in this case.
    233 	 */
    234 	if (section)
    235 		subp = section;
    236 
    237 
    238 	/*
    239 	 * 3: now we either have text string path (p_path) or a tag
    240 	 * based path (defp).   we need to append subp and machine
    241 	 * to each element in the path.
    242 	 *
    243 	 * for backward compat, we do not append subp if abs_section
    244 	 * and the path does not end in "/".
    245 	 */
    246 	newpathp = addlist("_new_path");
    247 	if (p_path) {
    248 		/* use p_path */
    249 		for (; (p = strtok(p_path, ":")) != NULL; p_path = NULL) {
    250 			for ( e_subp = TAILQ_FIRST(&subp->list) ;
    251 			      e_subp != NULL ;
    252 			      e_subp = TAILQ_NEXT(e_subp, q)) {
    253 				snprintf(buf, sizeof(buf), "%s/%s{/%s,}",
    254 					 p, e_subp->s, machine);
    255 				addentry(newpathp, buf, 0);
    256 			}
    257 		}
    258 	} else {
    259 		/* use defp rather than p_path */
    260 		for (e_defp = TAILQ_FIRST(&defp->list) ;
    261 		     e_defp != NULL ;
    262 		     e_defp = TAILQ_NEXT(e_defp, q)) {
    263 
    264 			/* handle trailing "/" magic here ... */
    265 		  	if (abs_section &&
    266 			    e_defp->s[strlen(e_defp->s) - 1] != '/') {
    267 
    268 				(void)snprintf(buf, sizeof(buf),
    269 				    "%s{/%s,}", e_defp->s, machine);
    270 				addentry(newpathp, buf, 0);
    271 				continue;
    272 			}
    273 
    274 			for ( e_subp = TAILQ_FIRST(&subp->list) ;
    275 			      e_subp != NULL ;
    276 			      e_subp = TAILQ_NEXT(e_subp, q)) {
    277 				snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    278 					 e_defp->s, (abs_section) ? "" : "/",
    279 					 e_subp->s, machine);
    280 				addentry(newpathp, buf, 0);
    281 			}
    282 		}
    283 	}				/* using defp ... */
    284 
    285 	/* now replace the current path with the new one */
    286 	defp = newpathp;
    287 
    288 	/*
    289 	 * 4: prepend the "-m" path, if specified.   we always add
    290 	 * subp and machine to this part of the path.
    291 	 */
    292 
    293 	if (p_add) {
    294 		for (p = strtok(p_add, ":") ; p ; p = strtok(NULL, ":")) {
    295 			for ( e_subp = TAILQ_FIRST(&subp->list) ;
    296 			      e_subp != NULL ;
    297 			      e_subp = TAILQ_NEXT(e_subp, q)) {
    298 				snprintf(buf, sizeof(buf), "%s/%s{/%s,}",
    299 					 p, e_subp->s, machine);
    300 				addentry(newpathp, buf, 1);
    301 			}
    302 		}
    303 	}
    304 
    305 
    306 	/*
    307 	 * 5: Search for the files.  Set up an interrupt handler, so the
    308 	 *    temporary files go away.
    309 	 */
    310 	(void)signal(SIGINT, onsig);
    311 	(void)signal(SIGHUP, onsig);
    312 	(void)signal(SIGPIPE, onsig);
    313 
    314 	memset(&pg, 0, sizeof(pg));
    315 	for (found = 0; *argv; ++argv)
    316 		if (manual(*argv, defp, &pg, pathsearch))
    317 			found = 1;
    318 
    319 	/* 6: If nothing found, we're done. */
    320 	if (!found) {
    321 		(void)cleanup();
    322 		exit (1);
    323 	}
    324 
    325 	/* 7: If it's simple, display it fast. */
    326 	if (f_cat) {
    327 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    328 			if (**ap == '\0')
    329 				continue;
    330 			cat(*ap);
    331 		}
    332 		exit (cleanup());
    333 	}
    334 	if (f_how) {
    335 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    336 			if (**ap == '\0')
    337 				continue;
    338 			how(*ap);
    339 		}
    340 		exit(cleanup());
    341 	}
    342 	if (f_where) {
    343 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    344 			if (**ap == '\0')
    345 				continue;
    346 			(void)printf("%s\n", *ap);
    347 		}
    348 		exit(cleanup());
    349 	}
    350 
    351 	/*
    352 	 * 8: We display things in a single command; build a list of things
    353 	 *    to display.
    354 	 */
    355 	for (ap = pg.gl_pathv, len = strlen(pager) + 1; *ap != NULL; ++ap) {
    356 		if (**ap == '\0')
    357 			continue;
    358 		len += strlen(*ap) + 1;
    359 	}
    360 	if ((cmd = malloc(len)) == NULL) {
    361 		warn("malloc");
    362 		(void)cleanup();
    363 		exit(1);
    364 	}
    365 	p = cmd;
    366 	len = strlen(pager);
    367 	memmove(p, pager, len);
    368 	p += len;
    369 	*p++ = ' ';
    370 	for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    371 		if (**ap == '\0')
    372 			continue;
    373 		len = strlen(*ap);
    374 		memmove(p, *ap, len);
    375 		p += len;
    376 		*p++ = ' ';
    377 	}
    378 	*--p = '\0';
    379 
    380 	/* Use system(3) in case someone's pager is "pager arg1 arg2". */
    381 	(void)system(cmd);
    382 
    383 	exit(cleanup());
    384 }
    385 
    386 /*
    387  * manual --
    388  *	Search the manuals for the pages.
    389  */
    390 static int
    391 manual(page, tag, pg, pathsearch)
    392 	char *page;
    393 	TAG *tag;
    394 	glob_t *pg;
    395 	const char *pathsearch;
    396 {
    397 	ENTRY *ep, *e_sufp, *e_tag;
    398 	TAG *missp, *sufp;
    399 	int anyfound, cnt, error, found;
    400 	char *p, buf[MAXPATHLEN];
    401 
    402 	anyfound = 0;
    403 	buf[0] = '*';
    404 
    405 	/* For each element in the list... */
    406 	e_tag = tag == NULL ? NULL : tag->list.tqh_first;
    407 	for (; e_tag != NULL; e_tag = e_tag->q.tqe_next) {
    408 		(void)snprintf(buf, sizeof(buf), "%s/%s.*", e_tag->s, page);
    409 		if ((error = glob(buf,
    410 		    GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT, NULL, pg)) != 0) {
    411 			if (error == GLOB_NOMATCH)
    412 				continue;
    413 			else {
    414 				warn("globbing");
    415 				(void)cleanup();
    416 				exit(1);
    417 			}
    418 		}
    419 		if (pg->gl_matchc == 0)
    420 			continue;
    421 
    422 		/* Find out if it's really a man page. */
    423 		for (cnt = pg->gl_pathc - pg->gl_matchc;
    424 		    cnt < pg->gl_pathc; ++cnt) {
    425 
    426 			if (pathsearch) {
    427 				p = strstr(pg->gl_pathv[cnt], pathsearch);
    428 				if (!p || strchr(p, '/') == NULL) {
    429 					pg->gl_pathv[cnt] = "";
    430 					continue;
    431 				}
    432 			}
    433 
    434 			/*
    435 			 * Try the _suffix key words first.
    436 			 *
    437 			 * XXX
    438 			 * Older versions of man.conf didn't have the suffix
    439 			 * key words, it was assumed that everything was a .0.
    440 			 * We just test for .0 first, it's fast and probably
    441 			 * going to hit.
    442 			 */
    443 			(void)snprintf(buf, sizeof(buf), "*/%s.0", page);
    444 			if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
    445 				goto next;
    446 
    447 			e_sufp = (sufp = getlist("_suffix")) == NULL ?
    448 			    NULL : sufp->list.tqh_first;
    449 			for (found = 0;
    450 			    e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
    451 				(void)snprintf(buf,
    452 				     sizeof(buf), "*/%s%s", page, e_sufp->s);
    453 				if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
    454 					found = 1;
    455 					break;
    456 				}
    457 			}
    458 			if (found)
    459 				goto next;
    460 
    461 			/* Try the _build key words next. */
    462 			e_sufp = (sufp = getlist("_build")) == NULL ?
    463 			    NULL : sufp->list.tqh_first;
    464 			for (found = 0;
    465 			    e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
    466 				for (p = e_sufp->s;
    467 				    *p != '\0' && !isspace((unsigned char)*p); ++p);
    468 				if (*p == '\0')
    469 					continue;
    470 				*p = '\0';
    471 				(void)snprintf(buf,
    472 				     sizeof(buf), "*/%s%s", page, e_sufp->s);
    473 				if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
    474 					if (!f_where)
    475 						build_page(p + 1,
    476 						    &pg->gl_pathv[cnt]);
    477 					*p = ' ';
    478 					found = 1;
    479 					break;
    480 				}
    481 				*p = ' ';
    482 			}
    483 			if (found) {
    484 next:				anyfound = 1;
    485 				if (!f_all) {
    486 					/* Delete any other matches. */
    487 					while (++cnt< pg->gl_pathc)
    488 						pg->gl_pathv[cnt] = "";
    489 					break;
    490 				}
    491 				continue;
    492 			}
    493 
    494 			/* It's not a man page, forget about it. */
    495 			pg->gl_pathv[cnt] = "";
    496 		}
    497 
    498 		if (anyfound && !f_all)
    499 			break;
    500 	}
    501 
    502 	/* If not found, enter onto the missing list. */
    503 	if (!anyfound) {
    504 		if ((missp = getlist("_missing")) == NULL)
    505 			missp = addlist("_missing");
    506 		if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    507 		    (ep->s = strdup(page)) == NULL) {
    508 			warn("malloc");
    509 			(void)cleanup();
    510 			exit(1);
    511 		}
    512 		TAILQ_INSERT_TAIL(&missp->list, ep, q);
    513 	}
    514 	return (anyfound);
    515 }
    516 
    517 /*
    518  * build_page --
    519  *	Build a man page for display.
    520  */
    521 static void
    522 build_page(fmt, pathp)
    523 	char *fmt, **pathp;
    524 {
    525 	static int warned;
    526 	ENTRY *ep;
    527 	TAG *intmpp;
    528 	int fd, n;
    529 	char *p, *b;
    530 	char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[MAXPATHLEN];
    531 	const char *tmpdir;
    532 
    533 	/* Let the user know this may take awhile. */
    534 	if (!warned) {
    535 		warned = 1;
    536 		warnx("Formatting manual page...");
    537 	}
    538 
    539        /*
    540         * Historically man chdir'd to the root of the man tree.
    541         * This was used in man pages that contained relative ".so"
    542         * directives (including other man pages for command aliases etc.)
    543         * It even went one step farther, by examining the first line
    544         * of the man page and parsing the .so filename so it would
    545         * make hard(?) links to the cat'ted man pages for space savings.
    546         * (We don't do that here, but we could).
    547         */
    548 
    549        /* copy and find the end */
    550        for (b = buf, p = *pathp; (*b++ = *p++) != '\0';)
    551                continue;
    552 
    553 	/* skip the last two path components, page name and man[n] */
    554 	for (--b, --p, n = 2; b != buf; b--, p--)
    555 		if (*b == '/')
    556 			if (--n == 0) {
    557 				*b = '\0';
    558 				(void) chdir(buf);
    559 				p++;
    560 				break;
    561 			}
    562 
    563 
    564 	/* Add a remove-when-done list. */
    565 	if ((intmpp = getlist("_intmp")) == NULL)
    566 		intmpp = addlist("_intmp");
    567 
    568 	/* Move to the printf(3) format string. */
    569 	for (; *fmt && isspace((unsigned char)*fmt); ++fmt)
    570 		continue;
    571 
    572 	/*
    573 	 * Get a temporary file and build a version of the file
    574 	 * to display.  Replace the old file name with the new one.
    575 	 */
    576 	if ((tmpdir = getenv("TMPDIR")) == NULL)
    577 		tmpdir = _PATH_TMP;
    578 	(void)snprintf(tpath, sizeof (tpath), "%s/%s", tmpdir, TMPFILE);
    579 	if ((fd = mkstemp(tpath)) == -1) {
    580 		warn("%s", tpath);
    581 		(void)cleanup();
    582 		exit(1);
    583 	}
    584 	(void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
    585 	(void)snprintf(cmd, sizeof(cmd), buf, p);
    586 	(void)system(cmd);
    587 	(void)close(fd);
    588 	if ((*pathp = strdup(tpath)) == NULL) {
    589 		warn("malloc");
    590 		(void)cleanup();
    591 		exit(1);
    592 	}
    593 
    594 	/* Link the built file into the remove-when-done list. */
    595 	if ((ep = malloc(sizeof(ENTRY))) == NULL) {
    596 		warn("malloc");
    597 		(void)cleanup();
    598 		exit(1);
    599 	}
    600 	ep->s = *pathp;
    601 	TAILQ_INSERT_TAIL(&intmpp->list, ep, q);
    602 }
    603 
    604 /*
    605  * how --
    606  *	display how information
    607  */
    608 static void
    609 how(fname)
    610 	char *fname;
    611 {
    612 	FILE *fp;
    613 
    614 	int lcnt, print;
    615 	char *p, buf[256];
    616 
    617 	if (!(fp = fopen(fname, "r"))) {
    618 		warn("%s", fname);
    619 		(void)cleanup();
    620 		exit (1);
    621 	}
    622 #define	S1	"SYNOPSIS"
    623 #define	S2	"S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
    624 #define	D1	"DESCRIPTION"
    625 #define	D2	"D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
    626 	for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
    627 		if (!strncmp(buf, S1, sizeof(S1) - 1) ||
    628 		    !strncmp(buf, S2, sizeof(S2) - 1)) {
    629 			print = 1;
    630 			continue;
    631 		} else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
    632 		    !strncmp(buf, D2, sizeof(D2) - 1))
    633 			return;
    634 		if (!print)
    635 			continue;
    636 		if (*buf == '\n')
    637 			++lcnt;
    638 		else {
    639 			for(; lcnt; --lcnt)
    640 				(void)putchar('\n');
    641 			for (p = buf; isspace((unsigned char)*p); ++p)
    642 				continue;
    643 			(void)fputs(p, stdout);
    644 		}
    645 	}
    646 	(void)fclose(fp);
    647 }
    648 
    649 /*
    650  * cat --
    651  *	cat out the file
    652  */
    653 static void
    654 cat(fname)
    655 	char *fname;
    656 {
    657 	int fd, n;
    658 	char buf[2048];
    659 
    660 	if ((fd = open(fname, O_RDONLY, 0)) < 0) {
    661 		warn("%s", fname);
    662 		(void)cleanup();
    663 		exit(1);
    664 	}
    665 	while ((n = read(fd, buf, sizeof(buf))) > 0)
    666 		if (write(STDOUT_FILENO, buf, n) != n) {
    667 			warn("write");
    668 			(void)cleanup();
    669 			exit (1);
    670 		}
    671 	if (n == -1) {
    672 		warn("read");
    673 		(void)cleanup();
    674 		exit(1);
    675 	}
    676 	(void)close(fd);
    677 }
    678 
    679 /*
    680  * check_pager --
    681  *	check the user supplied page information
    682  */
    683 static const char *
    684 check_pager(name)
    685 	const char *name;
    686 {
    687 	const char *p;
    688 
    689 	/*
    690 	 * if the user uses "more", we make it "more -s"; watch out for
    691 	 * PAGER = "mypager /usr/ucb/more"
    692 	 */
    693 	for (p = name; *p && !isspace((unsigned char)*p); ++p)
    694 		continue;
    695 	for (; p > name && *p != '/'; --p);
    696 	if (p != name)
    697 		++p;
    698 
    699 	/* make sure it's "more", not "morex" */
    700 	if (!strncmp(p, "more", 4) && (!p[4] || isspace((unsigned char)p[4]))){
    701 		char *newname;
    702 		(void)asprintf(&newname, "%s %s", p, "-s");
    703 		name = newname;
    704 	}
    705 
    706 	return (name);
    707 }
    708 
    709 /*
    710  * jump --
    711  *	strip out flag argument and jump
    712  */
    713 static void
    714 jump(argv, flag, name)
    715 	char **argv, *flag, *name;
    716 {
    717 	char **arg;
    718 
    719 	argv[0] = name;
    720 	for (arg = argv + 1; *arg; ++arg)
    721 		if (!strcmp(*arg, flag))
    722 			break;
    723 	for (; *arg; ++arg)
    724 		arg[0] = arg[1];
    725 	execvp(name, argv);
    726 	(void)fprintf(stderr, "%s: Command not found.\n", name);
    727 	exit(1);
    728 }
    729 
    730 /*
    731  * onsig --
    732  *	If signaled, delete the temporary files.
    733  */
    734 static void
    735 onsig(signo)
    736 	int signo;
    737 {
    738 	sigset_t set;
    739 
    740 	(void)cleanup();
    741 
    742 	(void)signal(signo, SIG_DFL);
    743 
    744 	/* unblock the signal */
    745 	sigemptyset(&set);
    746 	sigaddset(&set, signo);
    747 	sigprocmask(SIG_UNBLOCK, &set, (sigset_t *) NULL);
    748 
    749 	(void)kill(getpid(), signo);
    750 
    751 	/* NOTREACHED */
    752 	exit (1);
    753 }
    754 
    755 /*
    756  * cleanup --
    757  *	Clean up temporary files, show any error messages.
    758  */
    759 static int
    760 cleanup()
    761 {
    762 	TAG *intmpp, *missp;
    763 	ENTRY *ep;
    764 	int rval;
    765 
    766 	rval = 0;
    767 	ep = (missp = getlist("_missing")) == NULL ?
    768 	    NULL : missp->list.tqh_first;
    769 	if (ep != NULL)
    770 		for (; ep != NULL; ep = ep->q.tqe_next) {
    771 			warnx("no entry for %s in the manual.", ep->s);
    772 			rval = 1;
    773 		}
    774 
    775 	ep = (intmpp = getlist("_intmp")) == NULL ?
    776 	    NULL : intmpp->list.tqh_first;
    777 	for (; ep != NULL; ep = ep->q.tqe_next)
    778 		(void)unlink(ep->s);
    779 	return (rval);
    780 }
    781 
    782 /*
    783  * usage --
    784  *	print usage message and die
    785  */
    786 static void
    787 usage()
    788 {
    789 
    790 	(void)fprintf(stderr, "Usage: %s [-achw] [-C file] [-M path] [-m path]"
    791 	    "[-S srch] [[-s] section] title ...\n", getprogname());
    792 	exit(1);
    793 }
    794