1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 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 <sys/types.h> 33 #include <sys/uio.h> 34 35 #include <assert.h> 36 #include <capsicum_helpers.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <limits.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 int 45 main(int argc, char *argv[]) 46 { 47 int nflag; /* if not set, output a trailing newline. */ 48 int veclen; /* number of writev arguments. */ 49 struct iovec *iov, *vp; /* Elements to write, current element. */ 50 char space[] = " "; 51 char newline[] = "\n"; 52 53 if (caph_limit_stdio() < 0 || caph_enter() < 0) 54 err(1, "capsicum"); 55 56 /* This utility may NOT do getopt(3) option parsing. */ 57 if (*++argv && !strcmp(*argv, "-n")) { 58 ++argv; 59 --argc; 60 nflag = 1; 61 } else 62 nflag = 0; 63 64 veclen = (argc >= 2) ? (argc - 2) * 2 + 1 : 0; 65 66 if ((vp = iov = malloc((veclen + 1) * sizeof(struct iovec))) == NULL) 67 err(1, "malloc"); 68 69 while (argv[0] != NULL) { 70 size_t len; 71 72 len = strlen(argv[0]); 73 74 /* 75 * If the next argument is NULL then this is the last argument, 76 * therefore we need to check for a trailing \c. 77 */ 78 if (argv[1] == NULL) { 79 /* is there room for a '\c' and is there one? */ 80 if (len >= 2 && 81 argv[0][len - 2] == '\\' && 82 argv[0][len - 1] == 'c') { 83 /* chop it and set the no-newline flag. */ 84 len -= 2; 85 nflag = 1; 86 } 87 } 88 vp->iov_base = *argv; 89 vp++->iov_len = len; 90 if (*++argv) { 91 vp->iov_base = space; 92 vp++->iov_len = 1; 93 } 94 } 95 if (!nflag) { 96 veclen++; 97 vp->iov_base = newline; 98 vp++->iov_len = 1; 99 } 100 /* assert(veclen == (vp - iov)); */ 101 while (veclen) { 102 int nwrite; 103 104 nwrite = (veclen > IOV_MAX) ? IOV_MAX : veclen; 105 if (writev(STDOUT_FILENO, iov, nwrite) == -1) 106 err(1, "write"); 107 iov += nwrite; 108 veclen -= nwrite; 109 } 110 return 0; 111 } 112