usr.bin/man/whatis/whatis.c

/*
 * Copyright (c) 1987 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 *
 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
 * --------------------         -----   ----------------------
 * CURRENT PATCH LEVEL:         1       00005
 * --------------------         -----   ----------------------
 *
 * 20 Aug 92    Andrew Moore            Fixed core dump from uninited pointers
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)whatis.c    5.6 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/param.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include "../man/pathnames.h"

#define MAXLINELEN      256                     /* max line handled */

char *progname;

static int *found, foundman;

main(argc, argv)
        int argc;
        char **argv;
{
        extern char *optarg;
        extern int optind;
        register char *beg, **p;
        int ch;
        char *p_augment, *p_path, **getdb();

        progname = "whatis";
        p_augment = p_path = NULL;      /* 20 Aug 92*/
        while ((ch = getopt(argc, argv, "M:m:P:")) != EOF)
                switch((char)ch) {
                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();

        /*NOSTRICT*/
        if (!(found = (int *)malloc((u_int)argc)))
                enomem();
        bzero((char *)found, argc * sizeof(int));

        for (p = argv; *p; ++p)                 /* trim full paths */
                if (beg = rindex(*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
                for (p = getdb(); *p; ++p)
                        whatis(argv, *p, 0);

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

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

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

                if (buildpath) {
                        char hold[MAXPATHLEN + 1];

                        (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
 */
match(bp, str)
        register char *bp, *str;
{
        register int len;
        register char *start;

        if (!*str || !*bp)
                return(0);
        for (len = strlen(str);;) {
                for (; *bp && !isdigit(*bp) && !isalpha(*bp); ++bp);
                if (!*bp)
                        break;
                for (start = bp++;
                    *bp && (*bp == '_' || isdigit(*bp) || isalpha(*bp)); ++bp);
                if (bp - start == len && !strncasecmp(start, str, len))
                        return(1);
        }
        return(0);
}

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

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

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