/*      $OpenBSD: what.c,v 1.17 2023/03/08 04:43:13 guenther Exp $      */
/*      $NetBSD: what.c,v 1.4 1994/12/20 16:01:03 jtc Exp $     */

/*
 * Copyright (c) 1980, 1988, 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/types.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <ctype.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void search(char *);
static void usage(void);

static int matches;
static int sflag;

extern char *__progname;

/*
 * what
 */
int
main(int argc, char *argv[])
{
        struct utsname utsn;
        char match[256];
        int c;

        if (pledge("stdio rpath", NULL) == -1)
                err(1, "pledge");

        matches = sflag = 0;
        while ((c = getopt(argc, argv, "s")) != -1) {
                switch (c) {
                case 's':
                        sflag = 1;
                        break;
                default:
                        usage();
                }
        }
        argc -= optind;
        argv += optind;

        if (uname(&utsn) == -1)
                err(1, "uname");
        strlcpy(match, utsn.sysname, sizeof match);

        if (argc < 1) {
                usage();
        } else do {
                if (!freopen(*argv, "r", stdin)) {
                        perror(*argv);
                        exit(matches ? 0 : 1);
                }
                printf("%s:\n", *argv);
                search(match);
        } while(*++argv);
        exit(matches ? 0 : 1);
}

static void
search(char *match)
{
        int c;
        int i;

        while ((c = getchar()) != EOF) {
loop:           if (c == '$') {
                        for (i = 0; match[i]; i++)
                                if ((c = getchar()) != match[i])
                                        goto loop;
                        printf("\t$%s", match);
                        while (isprint(c = getchar())) {
                                putchar(c);
                                if (c == '$')
                                        break;
                        }
                        putchar('\n');
                        matches++;
                        if (sflag)
                                break;
                        goto loop;
                }
                if (c != '@')
                        continue;
                if ((c = getchar()) != '(')
                        goto loop;
                if ((c = getchar()) != '#')
                        goto loop;
                if ((c = getchar()) != ')')
                        goto loop;
                putchar('\t');
                while ((c = getchar()) != EOF && c && c != '"' &&
                    c != '>' && c != '\n' && c != '\\')
                        putchar(c);
                putchar('\n');
                matches++;
                if (sflag)
                        break;
        }
}

static void
usage(void)
{

        (void)fprintf(stderr, "usage: %s [-s] file ...\n", __progname);
        exit(1);
}