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man.c revision 1.1.1.1
      1 /*
      2  * Copyright (c) 1987, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char copyright[] =
     36 "@(#) Copyright (c) 1987, 1993\n\
     37 	The Regents of the University of California.  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)man.c	8.16 (Berkeley) 4/16/94";
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/queue.h>
     46 
     47 #include <ctype.h>
     48 #include <err.h>
     49 #include <errno.h>
     50 #include <fcntl.h>
     51 #include <fnmatch.h>
     52 #include <glob.h>
     53 #include <signal.h>
     54 #include <stdio.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #include "config.h"
     60 #include "pathnames.h"
     61 
     62 int f_all, f_where;
     63 
     64 static void	 build_page __P((char *, char **));
     65 static void	 cat __P((char *));
     66 static char	*check_pager __P((char *));
     67 static int	 cleanup __P((void));
     68 static void	 how __P((char *));
     69 static void	 jump __P((char **, char *, char *));
     70 static int	 manual __P((char *, TAG *, glob_t *));
     71 static void	 onsig __P((int));
     72 static void	 usage __P((void));
     73 
     74 int
     75 main(argc, argv)
     76 	int argc;
     77 	char *argv[];
     78 {
     79 	extern char *optarg;
     80 	extern int optind;
     81 	TAG *defp, *defnewp, *section, *sectnewp, *subp;
     82 	ENTRY *e_defp, *e_sectp, *e_subp, *ep;
     83 	glob_t pg;
     84 	size_t len;
     85 	int ch, f_cat, f_how, found;
     86 	char **ap, *cmd, *machine, *p, *p_add, *p_path, *pager, *slashp;
     87 	char *conffile, buf[MAXPATHLEN * 2];
     88 
     89 	f_cat = f_how = 0;
     90 	conffile = p_add = p_path = NULL;
     91 	while ((ch = getopt(argc, argv, "-aC:cfhkM:m:P:w")) != EOF)
     92 		switch (ch) {
     93 		case 'a':
     94 			f_all = 1;
     95 			break;
     96 		case 'C':
     97 			conffile = optarg;
     98 			break;
     99 		case 'c':
    100 		case '-':		/* Deprecated. */
    101 			f_cat = 1;
    102 			break;
    103 		case 'h':
    104 			f_how = 1;
    105 			break;
    106 		case 'm':
    107 			p_add = optarg;
    108 			break;
    109 		case 'M':
    110 		case 'P':		/* Backward compatibility. */
    111 			p_path = optarg;
    112 			break;
    113 		/*
    114 		 * The -f and -k options are backward compatible,
    115 		 * undocumented ways of calling whatis(1) and apropos(1).
    116 		 */
    117 		case 'f':
    118 			jump(argv, "-f", "whatis");
    119 			/* NOTREACHED */
    120 		case 'k':
    121 			jump(argv, "-k", "apropos");
    122 			/* NOTREACHED */
    123 		case 'w':
    124 			f_all = f_where = 1;
    125 			break;
    126 		case '?':
    127 		default:
    128 			usage();
    129 		}
    130 	argc -= optind;
    131 	argv += optind;
    132 
    133 	if (!*argv)
    134 		usage();
    135 
    136 	if (!f_cat && !f_how && !f_where)
    137 		if (!isatty(1))
    138 			f_cat = 1;
    139 		else if ((pager = getenv("PAGER")) != NULL)
    140 			pager = check_pager(pager);
    141 		else
    142 			pager = _PATH_PAGER;
    143 
    144 	/* Read the configuration file. */
    145 	config(conffile);
    146 
    147 	/* Get the machine type. */
    148 	if ((machine = getenv("MACHINE")) == NULL)
    149 		machine = MACHINE;
    150 
    151 	/* If there's no _default list, create an empty one. */
    152 	if ((defp = getlist("_default")) == NULL)
    153 		defp = addlist("_default");
    154 
    155 	/*
    156 	 * 1: If the user specified a MANPATH variable, or set the -M
    157 	 *    option, we replace the _default list with the user's list,
    158 	 *    appending the entries in the _subdir list and the machine.
    159 	 */
    160 	if (p_path == NULL)
    161 		p_path = getenv("MANPATH");
    162 	if (p_path != NULL) {
    163 		while ((e_defp = defp->list.tqh_first) != NULL) {
    164 			free(e_defp->s);
    165 			TAILQ_REMOVE(&defp->list, e_defp, q);
    166 		}
    167 		for (p = strtok(p_path, ":");
    168 		    p != NULL; p = strtok(NULL, ":")) {
    169 			slashp = p[strlen(p) - 1] == '/' ? "" : "/";
    170 			e_subp = (subp = getlist("_subdir")) == NULL ?
    171 			    NULL : subp->list.tqh_first;
    172 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    173 				(void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    174 				    p, slashp, e_subp->s, machine);
    175 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    176 				    (ep->s = strdup(buf)) == NULL)
    177 					err(1, NULL);
    178 				TAILQ_INSERT_TAIL(&defp->list, ep, q);
    179 			}
    180 		}
    181 	}
    182 
    183 	/*
    184 	 * 2: If the user did not specify MANPATH, -M or a section, rewrite
    185 	 *    the _default list to include the _subdir list and the machine.
    186 	 */
    187 	if (argv[1] == NULL)
    188 		section = NULL;
    189 	else if ((section = getlist(*argv)) != NULL)
    190 		++argv;
    191 	if (p_path == NULL && section == NULL) {
    192 		defnewp = addlist("_default_new");
    193 		e_defp =
    194 		    defp->list.tqh_first == NULL ? NULL : defp->list.tqh_first;
    195 		for (; e_defp != NULL; e_defp = e_defp->q.tqe_next) {
    196 			slashp =
    197 			    e_defp->s[strlen(e_defp->s) - 1] == '/' ? "" : "/";
    198 			e_subp = (subp = getlist("_subdir")) == NULL ?
    199 			    NULL : subp->list.tqh_first;
    200 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    201 				(void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    202 				e_defp->s, slashp, e_subp->s, machine);
    203 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    204 				    (ep->s = strdup(buf)) == NULL)
    205 					err(1, NULL);
    206 				TAILQ_INSERT_TAIL(&defnewp->list, ep, q);
    207 			}
    208 		}
    209 		defp = getlist("_default");
    210 		while ((e_defp = defp->list.tqh_first) != NULL) {
    211 			free(e_defp->s);
    212 			TAILQ_REMOVE(&defp->list, e_defp, q);
    213 		}
    214 		free(defp->s);
    215 		TAILQ_REMOVE(&head, defp, q);
    216 		defnewp = getlist("_default_new");
    217 		free(defnewp->s);
    218 		defnewp->s = "_default";
    219 		defp = defnewp;
    220 	}
    221 
    222 	/*
    223 	 * 3: If the user set the -m option, insert the user's list before
    224 	 *    whatever list we have, again appending the _subdir list and
    225 	 *    the machine.
    226 	 */
    227 	if (p_add != NULL)
    228 		for (p = strtok(p_add, ":"); p != NULL; p = strtok(NULL, ":")) {
    229 			slashp = p[strlen(p) - 1] == '/' ? "" : "/";
    230 			e_subp = (subp = getlist("_subdir")) == NULL ?
    231 			    NULL : subp->list.tqh_first;
    232 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    233 				(void)snprintf(buf, sizeof(buf), "%s%s%s{/%s,}",
    234 				    p, slashp, e_subp->s, machine);
    235 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    236 				    (ep->s = strdup(buf)) == NULL)
    237 					err(1, NULL);
    238 				TAILQ_INSERT_HEAD(&defp->list, ep, q);
    239 			}
    240 		}
    241 
    242 	/*
    243 	 * 4: If none of MANPATH, -M, or -m were specified, and a section was,
    244 	 *    rewrite the section's paths (if they have a trailing slash) to
    245 	 *    append the _subdir list and the machine.  This then becomes the
    246 	 *    _default list.
    247 	 */
    248 	if (p_path == NULL && p_add == NULL && section != NULL) {
    249 		sectnewp = addlist("_section_new");
    250 		for (e_sectp = section->list.tqh_first;
    251 		    e_sectp != NULL; e_sectp = e_sectp->q.tqe_next) {
    252 			if (e_sectp->s[strlen(e_sectp->s) - 1] != '/') {
    253 				(void)snprintf(buf, sizeof(buf),
    254 				    "%s{/%s,}", e_sectp->s, machine);
    255 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    256 				    (ep->s = strdup(buf)) == NULL)
    257 					err(1, NULL);
    258 				TAILQ_INSERT_TAIL(&sectnewp->list, ep, q);
    259 				continue;
    260 			}
    261 			e_subp = (subp = getlist("_subdir")) == NULL ?
    262 			    NULL : subp->list.tqh_first;
    263 			for (; e_subp != NULL; e_subp = e_subp->q.tqe_next) {
    264 				(void)snprintf(buf, sizeof(buf), "%s%s{/%s,}",
    265 				    e_sectp->s, e_subp->s, machine);
    266 				if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    267 				    (ep->s = strdup(buf)) == NULL)
    268 					err(1, NULL);
    269 				TAILQ_INSERT_TAIL(&sectnewp->list, ep, q);
    270 			}
    271 		}
    272 		sectnewp->s = section->s;
    273 		defp = sectnewp;
    274 		TAILQ_REMOVE(&head, section, q);
    275 	}
    276 
    277 	/*
    278 	 * 5: Search for the files.  Set up an interrupt handler, so the
    279 	 *    temporary files go away.
    280 	 */
    281 	(void)signal(SIGINT, onsig);
    282 	(void)signal(SIGHUP, onsig);
    283 
    284 	memset(&pg, 0, sizeof(pg));
    285 	for (found = 0; *argv; ++argv)
    286 		if (manual(*argv, defp, &pg))
    287 			found = 1;
    288 
    289 	/* 6: If nothing found, we're done. */
    290 	if (!found) {
    291 		(void)cleanup();
    292 		exit (1);
    293 	}
    294 
    295 	/* 7: If it's simple, display it fast. */
    296 	if (f_cat) {
    297 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    298 			if (**ap == '\0')
    299 				continue;
    300 			cat(*ap);
    301 		}
    302 		exit (cleanup());
    303 	}
    304 	if (f_how) {
    305 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    306 			if (**ap == '\0')
    307 				continue;
    308 			how(*ap);
    309 		}
    310 		exit(cleanup());
    311 	}
    312 	if (f_where) {
    313 		for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    314 			if (**ap == '\0')
    315 				continue;
    316 			(void)printf("%s\n", *ap);
    317 		}
    318 		exit(cleanup());
    319 	}
    320 
    321 	/*
    322 	 * 8: We display things in a single command; build a list of things
    323 	 *    to display.
    324 	 */
    325 	for (ap = pg.gl_pathv, len = strlen(pager) + 1; *ap != NULL; ++ap) {
    326 		if (**ap == '\0')
    327 			continue;
    328 		len += strlen(*ap) + 1;
    329 	}
    330 	if ((cmd = malloc(len)) == NULL) {
    331 		warn(NULL);
    332 		(void)cleanup();
    333 		exit(1);
    334 	}
    335 	p = cmd;
    336 	len = strlen(pager);
    337 	memmove(p, pager, len);
    338 	p += len;
    339 	*p++ = ' ';
    340 	for (ap = pg.gl_pathv; *ap != NULL; ++ap) {
    341 		if (**ap == '\0')
    342 			continue;
    343 		len = strlen(*ap);
    344 		memmove(p, *ap, len);
    345 		p += len;
    346 		*p++ = ' ';
    347 	}
    348 	*p = '\0';
    349 
    350 	/* Use system(3) in case someone's pager is "pager arg1 arg2". */
    351 	(void)system(cmd);
    352 
    353 	exit(cleanup());
    354 }
    355 
    356 /*
    357  * manual --
    358  *	Search the manuals for the pages.
    359  */
    360 static int
    361 manual(page, tag, pg)
    362 	char *page;
    363 	TAG *tag;
    364 	glob_t *pg;
    365 {
    366 	ENTRY *ep, *e_sufp, *e_tag;
    367 	TAG *missp, *sufp;
    368 	int anyfound, cnt, found;
    369 	char *p, buf[128];
    370 
    371 	anyfound = 0;
    372 	buf[0] = '*';
    373 
    374 	/* For each element in the list... */
    375 	e_tag = tag == NULL ? NULL : tag->list.tqh_first;
    376 	for (; e_tag != NULL; e_tag = e_tag->q.tqe_next) {
    377 		(void)snprintf(buf, sizeof(buf), "%s/%s.*", e_tag->s, page);
    378 		if (glob(buf,
    379 		    GLOB_APPEND | GLOB_BRACE | GLOB_NOSORT | GLOB_QUOTE,
    380 		    NULL, pg)) {
    381 			warn("globbing");
    382 			(void)cleanup();
    383 			exit(1);
    384 		}
    385 		if (pg->gl_matchc == 0)
    386 			continue;
    387 
    388 		/* Find out if it's really a man page. */
    389 		for (cnt = pg->gl_pathc - pg->gl_matchc;
    390 		    cnt < pg->gl_pathc; ++cnt) {
    391 
    392 			/*
    393 			 * Try the _suffix key words first.
    394 			 *
    395 			 * XXX
    396 			 * Older versions of man.conf didn't have the suffix
    397 			 * key words, it was assumed that everything was a .0.
    398 			 * We just test for .0 first, it's fast and probably
    399 			 * going to hit.
    400 			 */
    401 			(void)snprintf(buf, sizeof(buf), "*/%s.0", page);
    402 			if (!fnmatch(buf, pg->gl_pathv[cnt], 0))
    403 				goto next;
    404 
    405 			e_sufp = (sufp = getlist("_suffix")) == NULL ?
    406 			    NULL : sufp->list.tqh_first;
    407 			for (found = 0;
    408 			    e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
    409 				(void)snprintf(buf,
    410 				     sizeof(buf), "*/%s%s", page, e_sufp->s);
    411 				if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
    412 					found = 1;
    413 					break;
    414 				}
    415 			}
    416 			if (found)
    417 				goto next;
    418 
    419 			/* Try the _build key words next. */
    420 			e_sufp = (sufp = getlist("_build")) == NULL ?
    421 			    NULL : sufp->list.tqh_first;
    422 			for (found = 0;
    423 			    e_sufp != NULL; e_sufp = e_sufp->q.tqe_next) {
    424 				for (p = e_sufp->s;
    425 				    *p != '\0' && !isspace(*p); ++p);
    426 				if (*p == '\0')
    427 					continue;
    428 				*p = '\0';
    429 				(void)snprintf(buf,
    430 				     sizeof(buf), "*/%s%s", page, e_sufp->s);
    431 				if (!fnmatch(buf, pg->gl_pathv[cnt], 0)) {
    432 					if (!f_where)
    433 						build_page(p + 1,
    434 						    &pg->gl_pathv[cnt]);
    435 					*p = ' ';
    436 					found = 1;
    437 					break;
    438 				}
    439 				*p = ' ';
    440 			}
    441 			if (found) {
    442 next:				anyfound = 1;
    443 				if (!f_all) {
    444 					/* Delete any other matches. */
    445 					while (++cnt< pg->gl_pathc)
    446 						pg->gl_pathv[cnt] = "";
    447 					break;
    448 				}
    449 				continue;
    450 			}
    451 
    452 			/* It's not a man page, forget about it. */
    453 			pg->gl_pathv[cnt] = "";
    454 		}
    455 
    456 		if (anyfound && !f_all)
    457 			break;
    458 	}
    459 
    460 	/* If not found, enter onto the missing list. */
    461 	if (!anyfound) {
    462 		if ((missp = getlist("_missing")) == NULL)
    463 			missp = addlist("_missing");
    464 		if ((ep = malloc(sizeof(ENTRY))) == NULL ||
    465 		    (ep->s = strdup(page)) == NULL) {
    466 			warn(NULL);
    467 			(void)cleanup();
    468 			exit(1);
    469 		}
    470 		TAILQ_INSERT_TAIL(&missp->list, ep, q);
    471 	}
    472 	return (anyfound);
    473 }
    474 
    475 /*
    476  * build_page --
    477  *	Build a man page for display.
    478  */
    479 static void
    480 build_page(fmt, pathp)
    481 	char *fmt, **pathp;
    482 {
    483 	static int warned;
    484 	ENTRY *ep;
    485 	TAG *intmpp;
    486 	int fd;
    487 	char buf[MAXPATHLEN], cmd[MAXPATHLEN], tpath[sizeof(_PATH_TMP)];
    488 
    489 	/* Let the user know this may take awhile. */
    490 	if (!warned) {
    491 		warned = 1;
    492 		warnx("Formatting manual page...");
    493 	}
    494 
    495 	/* Add a remove-when-done list. */
    496 	if ((intmpp = getlist("_intmp")) == NULL)
    497 		intmpp = addlist("_intmp");
    498 
    499 	/* Move to the printf(3) format string. */
    500 	for (; *fmt && isspace(*fmt); ++fmt);
    501 
    502 	/*
    503 	 * Get a temporary file and build a version of the file
    504 	 * to display.  Replace the old file name with the new one.
    505 	 */
    506 	(void)strcpy(tpath, _PATH_TMP);
    507 	if ((fd = mkstemp(tpath)) == -1) {
    508 		warn("%s", tpath);
    509 		(void)cleanup();
    510 		exit(1);
    511 	}
    512 	(void)snprintf(buf, sizeof(buf), "%s > %s", fmt, tpath);
    513 	(void)snprintf(cmd, sizeof(cmd), buf, *pathp);
    514 	(void)system(cmd);
    515 	(void)close(fd);
    516 	if ((*pathp = strdup(tpath)) == NULL) {
    517 		warn(NULL);
    518 		(void)cleanup();
    519 		exit(1);
    520 	}
    521 
    522 	/* Link the built file into the remove-when-done list. */
    523 	if ((ep = malloc(sizeof(ENTRY))) == NULL) {
    524 		warn(NULL);
    525 		(void)cleanup();
    526 		exit(1);
    527 	}
    528 	ep->s = *pathp;
    529 	TAILQ_INSERT_TAIL(&intmpp->list, ep, q);
    530 }
    531 
    532 /*
    533  * how --
    534  *	display how information
    535  */
    536 static void
    537 how(fname)
    538 	char *fname;
    539 {
    540 	FILE *fp;
    541 
    542 	int lcnt, print;
    543 	char *p, buf[256];
    544 
    545 	if (!(fp = fopen(fname, "r"))) {
    546 		warn("%s", fname);
    547 		(void)cleanup();
    548 		exit (1);
    549 	}
    550 #define	S1	"SYNOPSIS"
    551 #define	S2	"S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS"
    552 #define	D1	"DESCRIPTION"
    553 #define	D2	"D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN"
    554 	for (lcnt = print = 0; fgets(buf, sizeof(buf), fp);) {
    555 		if (!strncmp(buf, S1, sizeof(S1) - 1) ||
    556 		    !strncmp(buf, S2, sizeof(S2) - 1)) {
    557 			print = 1;
    558 			continue;
    559 		} else if (!strncmp(buf, D1, sizeof(D1) - 1) ||
    560 		    !strncmp(buf, D2, sizeof(D2) - 1))
    561 			return;
    562 		if (!print)
    563 			continue;
    564 		if (*buf == '\n')
    565 			++lcnt;
    566 		else {
    567 			for(; lcnt; --lcnt)
    568 				(void)putchar('\n');
    569 			for (p = buf; isspace(*p); ++p);
    570 			(void)fputs(p, stdout);
    571 		}
    572 	}
    573 	(void)fclose(fp);
    574 }
    575 
    576 /*
    577  * cat --
    578  *	cat out the file
    579  */
    580 static void
    581 cat(fname)
    582 	char *fname;
    583 {
    584 	int fd, n;
    585 	char buf[2048];
    586 
    587 	if ((fd = open(fname, O_RDONLY, 0)) < 0) {
    588 		warn("%s", fname);
    589 		(void)cleanup();
    590 		exit(1);
    591 	}
    592 	while ((n = read(fd, buf, sizeof(buf))) > 0)
    593 		if (write(STDOUT_FILENO, buf, n) != n) {
    594 			warn("write");
    595 			(void)cleanup();
    596 			exit (1);
    597 		}
    598 	if (n == -1) {
    599 		warn("read");
    600 		(void)cleanup();
    601 		exit(1);
    602 	}
    603 	(void)close(fd);
    604 }
    605 
    606 /*
    607  * check_pager --
    608  *	check the user supplied page information
    609  */
    610 static char *
    611 check_pager(name)
    612 	char *name;
    613 {
    614 	char *p, *save;
    615 
    616 	/*
    617 	 * if the user uses "more", we make it "more -s"; watch out for
    618 	 * PAGER = "mypager /usr/ucb/more"
    619 	 */
    620 	for (p = name; *p && !isspace(*p); ++p);
    621 	for (; p > name && *p != '/'; --p);
    622 	if (p != name)
    623 		++p;
    624 
    625 	/* make sure it's "more", not "morex" */
    626 	if (!strncmp(p, "more", 4) && (!p[4] || isspace(p[4]))){
    627 		save = name;
    628 		/* allocate space to add the "-s" */
    629 		if (!(name =
    630 		    malloc((u_int)(strlen(save) + sizeof("-s") + 1))))
    631 			err(1, NULL);
    632 		(void)sprintf(name, "%s %s", save, "-s");
    633 	}
    634 	return(name);
    635 }
    636 
    637 /*
    638  * jump --
    639  *	strip out flag argument and jump
    640  */
    641 static void
    642 jump(argv, flag, name)
    643 	char **argv, *flag, *name;
    644 {
    645 	char **arg;
    646 
    647 	argv[0] = name;
    648 	for (arg = argv + 1; *arg; ++arg)
    649 		if (!strcmp(*arg, flag))
    650 			break;
    651 	for (; *arg; ++arg)
    652 		arg[0] = arg[1];
    653 	execvp(name, argv);
    654 	(void)fprintf(stderr, "%s: Command not found.\n", name);
    655 	exit(1);
    656 }
    657 
    658 /*
    659  * onsig --
    660  *	If signaled, delete the temporary files.
    661  */
    662 static void
    663 onsig(signo)
    664 	int signo;
    665 {
    666 	(void)cleanup();
    667 
    668 	(void)signal(signo, SIG_DFL);
    669 	(void)kill(getpid(), signo);
    670 
    671 	/* NOTREACHED */
    672 	exit (1);
    673 }
    674 
    675 /*
    676  * cleanup --
    677  *	Clean up temporary files, show any error messages.
    678  */
    679 static int
    680 cleanup()
    681 {
    682 	TAG *intmpp, *missp;
    683 	ENTRY *ep;
    684 	int rval;
    685 
    686 	rval = 0;
    687 	ep = (missp = getlist("_missing")) == NULL ?
    688 	    NULL : missp->list.tqh_first;
    689 	if (ep != NULL)
    690 		for (; ep != NULL; ep = ep->q.tqe_next) {
    691 			warnx("no entry for %s in the manual.", ep->s);
    692 			rval = 1;
    693 		}
    694 
    695 	ep = (intmpp = getlist("_intmp")) == NULL ?
    696 	    NULL : intmpp->list.tqh_first;
    697 	for (; ep != NULL; ep = ep->q.tqe_next)
    698 		(void)unlink(ep->s);
    699 	return (rval);
    700 }
    701 
    702 /*
    703  * usage --
    704  *	print usage message and die
    705  */
    706 static void
    707 usage()
    708 {
    709 	(void)fprintf(stderr,
    710     "usage: man [-achw] [-C file] [-M path] [-m path] [section] title ...\n");
    711 	exit(1);
    712 }
    713