1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1988, 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 <err.h>
33#include <stdbool.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <unistd.h>
37
38static void usage(void) __dead2;
39static bool search(bool, bool, FILE *);
40
41int
42main(int argc, char *argv[])
43{
44	const char *file;
45	FILE *in;
46	bool found, qflag, sflag;
47	int c;
48
49	qflag = sflag = false;
50
51	while ((c = getopt(argc, argv, "qs")) != -1) {
52		switch (c) {
53		case 'q':
54			qflag = true;
55			break;
56		case 's':
57			sflag = true;
58			break;
59		default:
60			usage();
61		}
62	}
63	argc -= optind;
64	argv += optind;
65
66	found = false;
67
68	if (argc == 0) {
69		if (search(sflag, qflag, stdin))
70			found = true;
71	} else {
72		while (argc--) {
73			file = *argv++;
74			in = fopen(file, "r");
75			if (in == NULL) {
76				if (!qflag)
77					warn("%s", file);
78				continue;
79			}
80			if (!qflag)
81				printf("%s:\n", file);
82			if (search(sflag, qflag, in))
83				found = true;
84			fclose(in);
85		}
86	}
87	exit(found ? 0 : 1);
88}
89
90static void
91usage(void)
92{
93	fprintf(stderr, "usage: what [-qs] [file ...]\n");
94	exit(1);
95}
96
97bool
98search(bool one, bool quiet, FILE *in)
99{
100	bool found;
101	int c;
102
103	found = false;
104
105	while ((c = getc(in)) != EOF) {
106loop:		if (c != '@')
107			continue;
108		if ((c = getc(in)) != '(')
109			goto loop;
110		if ((c = getc(in)) != '#')
111			goto loop;
112		if ((c = getc(in)) != ')')
113			goto loop;
114		if (!quiet)
115			putchar('\t');
116		while ((c = getc(in)) != EOF && c && c != '"' &&
117		    c != '>' && c != '\\' && c != '\n')
118			putchar(c);
119		putchar('\n');
120		found = true;
121		if (one)
122			break;
123	}
124	return (found);
125}
126