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      1 /* $NetBSD: echo.c,v 1.23 2021/11/16 21:38:29 rillig Exp $	*/
      2 
      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/cdefs.h>
     33 __COPYRIGHT(
     34 "@(#) Copyright (c) 1989, 1993\
     35  The Regents of the University of California.  All rights reserved.");
     36 
     37 #if 0
     38 static char sccsid[] = "@(#)echo.c	8.1 (Berkeley) 5/31/93";
     39 #else
     40 __RCSID("$NetBSD: echo.c,v 1.23 2021/11/16 21:38:29 rillig Exp $");
     41 #endif
     42 
     43 #include <err.h>
     44 #include <locale.h>
     45 #include <stdbool.h>
     46 #include <stdio.h>
     47 #include <stdlib.h>
     48 #include <string.h>
     49 
     50 /* ARGSUSED */
     51 int
     52 main(int argc, char *argv[])
     53 {
     54 	bool nflag;
     55 
     56 	setprogname(argv[0]);
     57 	(void)setlocale(LC_ALL, "");
     58 
     59 	/* This utility may NOT do getopt(3) option parsing. */
     60 	nflag = *++argv != NULL && strcmp(*argv, "-n") == 0;
     61 	if (nflag)
     62 		++argv;
     63 
     64 	while (*argv != NULL) {
     65 		(void)printf("%s", *argv);
     66 		if (*++argv != NULL)
     67 			(void)putchar(' ');
     68 	}
     69 	if (!nflag)
     70 		(void)putchar('\n');
     71 	(void)fflush(stdout);
     72 	if (ferror(stdout) != 0)
     73 		err(1, "write error");
     74 	return 0;
     75 }
     76