1/*	$NetBSD: whatis.c,v 1.23 2008/07/21 14:19:28 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1987, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33
34#ifndef lint
35__COPYRIGHT("@(#) Copyright (c) 1987, 1993\
36 The Regents of the University of California.  All rights reserved.");
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)whatis.c	8.5 (Berkeley) 1/2/94";
42#else
43__RCSID("$NetBSD: whatis.c,v 1.23 2008/07/21 14:19:28 lukem Exp $");
44#endif
45#endif /* not lint */
46
47#include <sys/param.h>
48#include <sys/queue.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <glob.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <unistd.h>
57
58#include "manconf.h"		/* from ../man/ */
59#include "pathnames.h"		/* from ../man/ */
60
61#define	MAXLINELEN	8192			/* max line handled */
62
63static int *found, foundman;
64
65static void	dashtrunc(char *, char *);
66static int	match(char *, char *);
67__dead static void	usage(void);
68static void	whatis(char **, char *, int);
69
70int
71main(int argc, char **argv)
72{
73	ENTRY *ep;
74	TAG *tp;
75	int ch, rv;
76	char *beg, *conffile, **p, *p_augment, *p_path;
77	glob_t pg;
78
79	conffile = NULL;
80	p_augment = p_path = NULL;
81	while ((ch = getopt(argc, argv, "C:M:m:P:")) != -1)
82		switch (ch) {
83		case 'C':
84			conffile = optarg;
85			break;
86		case 'M':
87		case 'P':		/* backward compatible */
88			p_path = optarg;
89			break;
90		case 'm':
91			p_augment = optarg;
92			break;
93		case '?':
94		default:
95			usage();
96		}
97	argv += optind;
98	argc -= optind;
99
100	if (argc < 1)
101		usage();
102
103	if ((found = malloc((u_int)argc * sizeof(int))) == NULL)
104		err(1, "malloc");
105	memset(found, 0, argc * sizeof(int));
106
107	for (p = argv; *p; ++p)			/* trim full paths */
108		if ((beg = strrchr(*p, '/')))
109			*p = beg + 1;
110
111	if (p_augment)
112		whatis(argv, p_augment, 1);
113	if (p_path || (p_path = getenv("MANPATH")))
114		whatis(argv, p_path, 1);
115	else {
116		config(conffile);
117		tp = gettag("_whatdb", 0);
118		if (!tp)
119			errx(EXIT_FAILURE,
120			    "no database dirs (_whatdb) in config file");
121		TAILQ_FOREACH(ep, &tp->entrylist, q) {
122			if ((rv = glob(ep->s, GLOB_BRACE | GLOB_NOSORT, NULL,
123			    &pg)) != 0) {
124				if (rv == GLOB_NOMATCH)
125					continue;
126				else
127					err(EXIT_FAILURE, "glob");
128			}
129			if (pg.gl_pathc)
130				for (p = pg.gl_pathv; *p; p++)
131					whatis(argv, *p, 0);
132			globfree(&pg);
133		}
134	}
135
136	if (!foundman) {
137		fprintf(stderr, "whatis: no %s file found.\n", _PATH_WHATIS);
138		exit(1);
139	}
140	rv = 1;
141	for (p = argv; *p; ++p)
142		if (found[p - argv])
143			rv = 0;
144		else
145			printf("%s: not found\n", *p);
146	exit(rv);
147}
148
149static void
150whatis(char **argv, char *path, int buildpath)
151{
152	char *end, *name, **p;
153	char buf[MAXLINELEN + 1], wbuf[MAXLINELEN + 1];
154	char hold[MAXPATHLEN + 1];
155
156	for (name = path; name; name = end) {	/* through name list */
157		if ((end = strchr(name, ':')))
158			*end++ = '\0';
159
160		if (buildpath) {
161			(void)sprintf(hold, "%s/%s", name, _PATH_WHATIS);
162			name = hold;
163		}
164
165		if (!freopen(name, "r", stdin))
166			continue;
167
168		foundman = 1;
169
170		/* for each file found */
171		while (fgets(buf, sizeof(buf), stdin)) {
172			dashtrunc(buf, wbuf);
173			for (p = argv; *p; ++p)
174				if (match(wbuf, *p)) {
175					printf("%s", buf);
176					found[p - argv] = 1;
177
178					/* only print line once */
179					while (*++p)
180						if (match(wbuf, *p))
181							found[p - argv] = 1;
182					break;
183				}
184		}
185	}
186}
187
188/*
189 * match --
190 *	match a full word
191 */
192static int
193match(char *bp, char *str)
194{
195	int len;
196	char *start;
197
198	if (!*str || !*bp)
199		return(0);
200	for (len = strlen(str);;) {
201		/*
202		 * /bin/[ is a special case.
203		 */
204		for (; *bp && *bp != '[' && !isalnum((unsigned char)*bp); ++bp);
205		if (!*bp)
206			break;
207
208		/* check for word match first */
209		for (start = bp++; *bp && (*bp == '_' ||
210			isalnum((unsigned char) *bp)); ++bp);
211		if (bp - start == len && strncasecmp(start, str, len) == 0) {
212			return(1);
213		} else if (*bp && *bp != ',') {
214			/* check for full string match */
215			for (bp = start; *bp && *bp != ',' && *bp != '(' &&
216				!isspace((unsigned char) *bp); ++bp);
217			if (bp - start == len &&
218				strncasecmp(start, str, len) == 0)
219				return(1);
220		}
221	}
222	return(0);
223}
224
225/*
226 * dashtrunc --
227 *	truncate a string at " - "
228 */
229static void
230dashtrunc(char *from, char *to)
231{
232	int ch;
233
234	for (; (ch = *from) && ch != '\n' &&
235	    (ch != ' ' || from[1] != '-' || from[2] != ' '); ++from)
236		*to++ = ch;
237	*to = '\0';
238}
239
240/*
241 * usage --
242 *	print usage message and die
243 */
244static void
245usage(void)
246{
247	(void)fprintf(stderr,
248	    "usage: whatis [-C file] [-M path] [-m path] command ...\n");
249	exit(1);
250}
251