* Copyright (c) 1987, 1993

/* $NetBSD: whatis.c,v 1.24 2011/09/06 18:46:03 joerg Exp $ */

/*
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>

#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1987, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)whatis.c 8.5 (Berkeley) 1/2/94";
#else
__RCSID("$NetBSD: whatis.c,v 1.24 2011/09/06 18:46:03 joerg Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/queue.h>

#include <ctype.h>
#include <err.h>
#include <glob.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "manconf.h" /* from ../man/ */
#include "pathnames.h" /* from ../man/ */

#define MAXLINELEN 8192 /* max line handled */

static int *found, foundman;

static void dashtrunc(char *, char *);
static int match(char *, char *);
__dead static void usage(void);
static void whatis(char **, char *, int);

int
main(int argc, char **argv)
{
ENTRY *ep;
TAG *tp;
int ch, rv;
char *beg, *conffile, **p, *p_augment, *p_path;
glob_t pg;

conffile = NULL;
p_augment = p_path = NULL;
while ((ch = getopt(argc, argv, "C:M:m:P:")) != -1)
switch (ch) {
case 'C':
conffile = optarg;
break;
case 'M':
case 'P': /* backward compatible */
p_path = optarg;
break;
case 'm':
p_augment = optarg;
break;
case '?':
default:
usage();
}
argv += optind;
argc -= optind;

if (argc < 1)
usage();

if ((found = malloc((u_int)argc * sizeof(int))) == NULL)
err(1, "malloc");
memset(found, 0, argc * sizeof(int));

for (p = argv; *p; ++p) /* trim full paths */
if ((beg = strrchr(*p, '/')))
*p = beg + 1;

if (p_augment)
whatis(argv, p_augment, 1);
if (p_path || (p_path = getenv("MANPATH")))
whatis(argv, p_path, 1);
else {
config(conffile);
tp = gettag("_whatdb", 0);
if (!tp)
errx(EXIT_FAILURE,
"no database dirs (_whatdb) in config file");
TAILQ_FOREACH(ep, &tp->entrylist, q) {
if ((rv = glob(ep->s, GLOB_BRACE | GLOB_NOSORT, NULL,
&pg)) != 0) {
if (rv == GLOB_NOMATCH)
continue;
else
err(EXIT_FAILURE, "glob");
}
if (pg.gl_pathc)
for (p = pg.gl_pathv; *p; p++)
whatis(argv, *p, 0);
globfree(&pg);
}
}

if (!foundman) {
fprintf(stderr, "whatis: no %s file found.\n", _PATH_WHATIS);
exit(1);
}
rv = 1;
for (p = argv; *p; ++p)
if (found[p - argv])
rv = 0;
else
printf("%s: not found\n", *p);
exit(rv);
}

static void
whatis(char **argv, char *path, int buildpath)
{
char *end, *name, **p;
char buf[MAXLINELEN + 1], wbuf[MAXLINELEN + 1];
char hold[MAXPATHLEN + 1];

for (name = path; name; name = end) { /* through name list */
if ((end = strchr(name, ':')))
*end++ = '\0';

if (buildpath) {
(void)sprintf(hold, "%s/%s", name, _PATH_WHATIS);
name = hold;
}

if (!freopen(name, "r", stdin))
continue;

foundman = 1;

/* for each file found */
while (fgets(buf, sizeof(buf), stdin)) {
dashtrunc(buf, wbuf);
for (p = argv; *p; ++p)
if (match(wbuf, *p)) {
printf("%s", buf);
found[p - argv] = 1;

/* only print line once */
while (*++p)
if (match(wbuf, *p))
found[p - argv] = 1;
break;
}
}
}
}

/*
* match --
* match a full word
*/
static int
match(char *bp, char *str)
{
int len;
char *start;

if (!*str || !*bp)
return(0);
for (len = strlen(str);;) {
/*
* /bin/[ is a special case.
*/
for (; *bp && *bp != '[' && !isalnum((unsigned char)*bp); ++bp);
if (!*bp)
break;

/* check for word match first */
for (start = bp++; *bp && (*bp == '_' ||
isalnum((unsigned char) *bp)); ++bp);
if (bp - start == len && strncasecmp(start, str, len) == 0) {
return(1);
} else if (*bp && *bp != ',') {
/* check for full string match */
for (bp = start; *bp && *bp != ',' && *bp != '(' &&
!isspace((unsigned char) *bp); ++bp);
if (bp - start == len &&
strncasecmp(start, str, len) == 0)
return(1);
}
}
return(0);
}

/*
* dashtrunc --
* truncate a string at " - "
*/
static void
dashtrunc(char *from, char *to)
{
int ch;

for (; (ch = *from) && ch != '\n' &&
(ch != ' ' || from[1] != '-' || from[2] != ' '); ++from)
*to++ = ch;
*to = '\0';
}

/*
* usage --
* print usage message and die
*/
static void
usage(void)
{
(void)fprintf(stderr,
"usage: whatis [-C file] [-M path] [-m path] command ...\n");
exit(1);
}