echo.c revision 1.11 
1/* $NetBSD: echo.c,v 1.11 2003/08/07 09:05:12 agc 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#ifndef lint
34__COPYRIGHT(
35"@(#) Copyright (c) 1989, 1993\n\
36	The Regents of the University of California.  All rights reserved.\n");
37#endif /* not lint */
38
39#ifndef lint
40#if 0
41static char sccsid[] = "@(#)echo.c	8.1 (Berkeley) 5/31/93";
42#else
43__RCSID("$NetBSD: echo.c,v 1.11 2003/08/07 09:05:12 agc Exp $");
44#endif
45#endif /* not lint */
46
47#include <sys/param.h>
48
49#include <err.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include <vis.h>
55
56int stdout_ok;
57
58int main(int, char *[]);
59char *printescaped(const char *);
60
61/* ARGSUSED */
62int
63main(int argc, char *argv[])
64{
65	int nflag;
66
67	stdout_ok = isatty(STDOUT_FILENO);
68	/* This utility may NOT do getopt(3) option parsing. */
69	if (*++argv && !strcmp(*argv, "-n")) {
70		++argv;
71		nflag = 1;
72	}
73	else
74		nflag = 0;
75
76	while (*argv) {
77		char *n;
78		n = printescaped(*argv);
79		(void)printf("%s", n);
80		free(n);
81		if (*++argv)
82			(void)putchar(' ');
83	}
84	if (nflag == 0)
85		(void)putchar('\n');
86	exit(0);
87	/* NOTREACHED */
88}
89
90char *
91printescaped(const char *src)
92{
93	size_t len;
94	char *retval;
95
96	len = strlen(src);
97	if (len != 0 && SIZE_T_MAX/len <= 4) {
98		errx(EXIT_FAILURE, "%s: name too long", src);
99		/* NOTREACHED */
100	}
101
102	retval = (char *)malloc(4*len+1);
103	if (retval != NULL) {
104		if (stdout_ok)
105			(void)strvis(retval, src, VIS_NL | VIS_CSTYLE);
106		else
107			(void)strcpy(retval, src);
108		return retval;
109	} else
110		errx(EXIT_FAILURE, "out of memory!");
111		/* NOTREACHED */
112}
113