* Copyright (c) 1987, 1993, 1994

/* $NetBSD: apropos.c,v 1.30 2009/05/08 12:48:43 wiz Exp $ */

/*
* Copyright (c) 1987, 1993, 1994
* 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, 1994\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)apropos.c 8.8 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: apropos.c,v 1.30 2009/05/08 12:48:43 wiz Exp $");
#endif
#endif /* not lint */

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

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

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

static bool *found;
static bool foundman = false;

#define MAXLINELEN 8192 /* max line handled */

static void apropos(char **, const char *, bool, const char *, const char *);
static void lowstr(const char *, char *);
static bool match(const char *, const char *);
static void usage(void) __dead;

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

conffile = NULL;
p_augment = p_path = NULL;
machine = sflag = NULL;
while ((ch = getopt(argc, argv, "C:M:m:P:S:s:")) != -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 'S':
machine = optarg;
lowstr(machine, machine);
break;
case 's':
sflag = optarg;
lowstr(sflag, sflag);
break;
case '?':
default:
usage();
}
}
argv += optind;
argc -= optind;

if (argc < 1)
usage();

if ((found = malloc(argc * sizeof(*found))) == NULL)
err(EXIT_FAILURE, "malloc");
(void)memset(found, 0, argc * sizeof(*found));

for (p = argv; *p; ++p) /* convert to lower-case */
lowstr(*p, *p);

if (p_augment)
apropos(argv, p_augment, true, sflag, machine);
if (p_path || (p_path = getenv("MANPATH")))
apropos(argv, p_path, true, sflag, machine);
else {
config(conffile);
tp = gettag("_whatdb", 1);
if (!tp)
errx(EXIT_FAILURE, "malloc");
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++)
apropos(argv, *p, false, sflag,
machine);
globfree(&pg);
}
}

if (!foundman)
errx(EXIT_FAILURE, "no %s file found", _PATH_WHATIS);

rv = 1;
for (p = argv; *p; ++p)
if (found[p - argv])
rv = 0;
else
(void)printf("%s: nothing appropriate\n", *p);
return rv;
}

static void
apropos(char **argv, const char *path, bool buildpath,
const char *sflag, const char *machine)
{
char *end, **p;
const char *name;
char buf[MAXLINELEN + 1];
char hold[MAXPATHLEN + 1];
char wbuf[MAXLINELEN + 1];
size_t slen = 0, mlen = 0;

if (sflag)
slen = strlen(sflag);
if (machine)
mlen = strlen(machine);

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

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

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

foundman = true;

/* for each file found */
while (fgets(buf, (int)sizeof(buf), stdin)) {
if (!strchr(buf, '\n')) {
warnx("%s: line too long", name);
continue;
}
lowstr(buf, wbuf);
if (machine) {
if ((strncmp(wbuf, machine, mlen) != 0) ||
strlen(wbuf) <= mlen || wbuf[mlen] != '/')
continue;
}
if (sflag) {
char *s = strchr(wbuf, '(');

if (!s)
continue;
if (strncmp(s+1, sflag, slen) != 0)
continue;
}
for (p = argv; *p; ++p) {
if (match(wbuf, *p)) {
(void)printf("%s", buf);
found[p - argv] = true;

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

/*
* match --
* match anywhere the string appears
*/
static bool
match(const char *bp, const char *str)
{
size_t len;
char test;

if (!*bp)
return false;
/* backward compatible: everything matches empty string */
if (!*str)
return true;
for (test = *str++, len = strlen(str); *bp;)
if (test == *bp++ && !strncmp(bp, str, len))
return true;
return false;
}

/*
* lowstr --
* convert a string to lower case
*/
static void
lowstr(const char *from, char *to)
{
char ch;

while ((ch = *from++) && ch != '\n')
*to++ = tolower((unsigned char)ch);
*to = '\0';
}

/*
* usage --
* print usage message and die
*/
__dead
static void
usage(void)
{

(void)fprintf(stderr,
"usage: %s [-C file] [-M path] [-m path] "
"[-S subsection] [-s section]\n"
" keyword ...\n",
getprogname());
exit(1);
}