2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
34 static char const copyright[] =
35 "@(#) Copyright (c) 1989, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
40 static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93";
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include <sys/types.h>
50 #include <capsicum_helpers.h>
59 * Report an error and exit.
60 * Use it instead of err(3) to avoid linking-in stdio.
63 errexit(const char *prog, const char *reason)
65 char *errstr = strerror(errno);
66 write(STDERR_FILENO, prog, strlen(prog));
67 write(STDERR_FILENO, ": ", 2);
68 write(STDERR_FILENO, reason, strlen(reason));
69 write(STDERR_FILENO, ": ", 2);
70 write(STDERR_FILENO, errstr, strlen(errstr));
71 write(STDERR_FILENO, "\n", 1);
76 main(int argc, char *argv[])
78 int nflag; /* if not set, output a trailing newline. */
79 int veclen; /* number of writev arguments. */
80 struct iovec *iov, *vp; /* Elements to write, current element. */
82 char newline[] = "\n";
83 char *progname = argv[0];
85 if (caph_limit_stdio() < 0 || caph_enter() < 0)
88 /* This utility may NOT do getopt(3) option parsing. */
89 if (*++argv && !strcmp(*argv, "-n")) {
96 veclen = (argc >= 2) ? (argc - 2) * 2 + 1 : 0;
98 if ((vp = iov = malloc((veclen + 1) * sizeof(struct iovec))) == NULL)
99 errexit(progname, "malloc");
101 while (argv[0] != NULL) {
104 len = strlen(argv[0]);
107 * If the next argument is NULL then this is this
108 * the last argument, therefore we need to check
111 if (argv[1] == NULL) {
112 /* is there room for a '\c' and is there one? */
114 argv[0][len - 2] == '\\' &&
115 argv[0][len - 1] == 'c') {
116 /* chop it and set the no-newline flag. */
121 vp->iov_base = *argv;
124 vp->iov_base = space;
130 vp->iov_base = newline;
133 /* assert(veclen == (vp - iov)); */
137 nwrite = (veclen > IOV_MAX) ? IOV_MAX : veclen;
138 if (writev(STDOUT_FILENO, iov, nwrite) == -1)
139 errexit(progname, "write");