1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1987, 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#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1987, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)yes.c	8.1 (Berkeley) 6/6/93";
41#else
42static const char rcsid[] = "$FreeBSD$";
43#endif
44#endif /* not lint */
45
46#include <capsicum_helpers.h>
47#include <err.h>
48#include <stdio.h>
49#include <string.h>
50#include <unistd.h>
51
52int
53main(int argc, char **argv)
54{
55	char buf[8192];
56	char y[2] = { 'y', '\n' };
57	char * exp = y;
58	size_t buflen = 0;
59	size_t explen = sizeof(y);
60	size_t more;
61	ssize_t ret;
62
63	if (caph_limit_stdio() < 0 || caph_enter() < 0)
64		err(1, "capsicum");
65
66	if (argc > 1) {
67		exp = argv[1];
68		explen = strlen(exp) + 1;
69		exp[explen - 1] = '\n';
70	}
71
72	if (explen <= sizeof(buf)) {
73		while (buflen < sizeof(buf) - explen) {
74			memcpy(buf + buflen, exp, explen);
75			buflen += explen;
76		}
77		exp = buf;
78		explen = buflen;
79	}
80
81	more = explen;
82	while ((ret = write(STDOUT_FILENO, exp + (explen - more), more)) > 0)
83		if ((more -= ret) == 0)
84			more = explen;
85
86	err(1, "stdout");
87	/*NOTREACHED*/
88}
89