2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
32 static char const copyright[] =
33 "@(#) Copyright (c) 1989, 1993\n\
34 The Regents of the University of California. All rights reserved.\n";
38 static char sccsid[] = "@(#)echo.c 8.1 (Berkeley) 5/31/93";
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include <sys/types.h>
55 * Report an error and exit.
56 * Use it instead of err(3) to avoid linking-in stdio.
59 errexit(const char *prog, const char *reason)
61 char *errstr = strerror(errno);
62 write(STDERR_FILENO, prog, strlen(prog));
63 write(STDERR_FILENO, ": ", 2);
64 write(STDERR_FILENO, reason, strlen(reason));
65 write(STDERR_FILENO, ": ", 2);
66 write(STDERR_FILENO, errstr, strlen(errstr));
67 write(STDERR_FILENO, "\n", 1);
72 main(int argc, char *argv[])
74 int nflag; /* if not set, output a trailing newline. */
75 int veclen; /* number of writev arguments. */
76 struct iovec *iov, *vp; /* Elements to write, current element. */
78 char newline[] = "\n";
79 char *progname = argv[0];
81 /* This utility may NOT do getopt(3) option parsing. */
82 if (*++argv && !strcmp(*argv, "-n")) {
89 veclen = (argc >= 2) ? (argc - 2) * 2 + 1 : 0;
91 if ((vp = iov = malloc((veclen + 1) * sizeof(struct iovec))) == NULL)
92 errexit(progname, "malloc");
94 while (argv[0] != NULL) {
97 len = strlen(argv[0]);
100 * If the next argument is NULL then this is this
101 * the last argument, therefore we need to check
104 if (argv[1] == NULL) {
105 /* is there room for a '\c' and is there one? */
107 argv[0][len - 2] == '\\' &&
108 argv[0][len - 1] == 'c') {
109 /* chop it and set the no-newline flag. */
114 vp->iov_base = *argv;
117 vp->iov_base = space;
123 vp->iov_base = newline;
126 /* assert(veclen == (vp - iov)); */
130 nwrite = (veclen > IOV_MAX) ? IOV_MAX : veclen;
131 if (writev(STDOUT_FILENO, iov, nwrite) == -1)
132 errexit(progname, "write");