xref: /src/bin/echo/echo.c

/* $NetBSD: echo.c,v 1.22 2021/11/10 17:35:45 kre Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__COPYRIGHT(
"@(#) Copyright (c) 1989, 1993\
 The Regents of the University of California.  All rights reserved.");

#if 0
static char sccsid[] = "@(#)echo.c	8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: echo.c,v 1.22 2021/11/10 17:35:45 kre Exp $");
#endif

#include <err.h>
#include <locale.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* ARGSUSED */
int
main(int argc, char *argv[])
{
	bool nflag;

	setprogname(argv[0]);
	(void)setlocale(LC_ALL, "");

	/* This utility may NOT do getopt(3) option parsing. */
	nflag = *++argv != NULL && strcmp(*argv, "-n") == 0;
	if (nflag)
		++argv;

	while (*argv != NULL) {
		(void)printf("%s", *argv);
		if (*++argv != NULL)
			(void)putchar(' ');
	}
	if (!nflag)
		(void)putchar('\n');
	fflush(stdout);
	if (ferror(stdout))
		err(1, "write error");
	return 0;
}