1/*
2 * Copyright (c) 1987, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1987, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)yes.c	8.1 (Berkeley) 6/6/93";
39#else
40static const char rcsid[] = "$FreeBSD: stable/11/usr.bin/yes/yes.c 332464 2018-04-13 03:32:18Z kevans $";
41#endif
42#endif /* not lint */
43
44#include <capsicum_helpers.h>
45#include <err.h>
46#include <stdio.h>
47#include <string.h>
48#include <unistd.h>
49
50int
51main(int argc, char **argv)
52{
53	char buf[8192];
54	char y[2] = { 'y', '\n' };
55	char * exp = y;
56	size_t buflen = 0;
57	size_t explen = sizeof(y);
58	size_t more;
59	ssize_t ret;
60
61	if (caph_limit_stdio() < 0 || (cap_enter() < 0 && errno != ENOSYS))
62		err(1, "capsicum");
63
64	if (argc > 1) {
65		exp = argv[1];
66		explen = strlen(exp) + 1;
67		exp[explen - 1] = '\n';
68	}
69
70	if (explen <= sizeof(buf)) {
71		while (buflen < sizeof(buf) - explen) {
72			memcpy(buf + buflen, exp, explen);
73			buflen += explen;
74		}
75		exp = buf;
76		explen = buflen;
77	}
78
79	more = explen;
80	while ((ret = write(STDOUT_FILENO, exp + (explen - more), more)) > 0)
81		if ((more -= ret) == 0)
82			more = explen;
83
84	err(1, "stdout");
85	/*NOTREACHED*/
86}
87