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 33 static 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 40 static char sccsid[] = "@(#)yes.c 8.1 (Berkeley) 6/6/93"; 41 #else 42 static 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 52 int 53 main(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 || (cap_enter() < 0 && errno != ENOSYS)) 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