echo.c revision 99109 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char const copyright[] =
36"@(#) Copyright (c) 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)echo.c	8.1 (Berkeley) 5/31/93";
43#endif
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/bin/echo/echo.c 99109 2002-06-30 05:13:54Z obrien $");
47
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51
52/* ARGSUSED */
53int
54main(int argc __unused, char *argv[])
55{
56	int nflag;	/* if not set, output a trailing newline. */
57
58	/* This utility may NOT do getopt(3) option parsing. */
59	if (*++argv && !strcmp(*argv, "-n")) {
60		++argv;
61		nflag = 1;
62	}
63	else
64		nflag = 0;
65
66	while (argv[0] != NULL) {
67
68		/*
69		 * If the next argument is NULL then this is this
70		 * the last argument, therefore we need to check
71		 * for a trailing \c.
72		 */
73		if (argv[1] == NULL) {
74			size_t len;
75
76			len = strlen(argv[0]);
77			/* is there room for a '\c' and is there one? */
78			if (len >= 2 &&
79			    argv[0][len - 2] == '\\' &&
80			    argv[0][len - 1] == 'c') {
81				/* chop it and set the no-newline flag. */
82				argv[0][len - 2] = '\0';
83				nflag = 1;
84			}
85		}
86		(void)printf("%s", argv[0]);
87		if (*++argv)
88			putchar(' ');
89	}
90	if (!nflag)
91		putchar('\n');
92	return 0;
93}
94