echo.c revision 1.7 
1/*	$NetBSD: echo.c,v 1.7 1995/03/21 09:10:49 cgd Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	@(#)echo.c	8.1 (Berkeley) 5/31/93
39 */
40
41/*
42 * Echo command.
43 */
44
45#define main echocmd
46
47#include "bltin.h"
48
49/* #define eflag 1 */
50
51main(argc, argv)  char **argv; {
52	register char **ap;
53	register char *p;
54	register char c;
55	int count;
56	int nflag = 0;
57#ifndef eflag
58	int eflag = 0;
59#endif
60
61	ap = argv;
62	if (argc)
63		ap++;
64	if ((p = *ap) != NULL) {
65		if (equal(p, "-n")) {
66			nflag++;
67			ap++;
68		} else if (equal(p, "-e")) {
69#ifndef eflag
70			eflag++;
71#endif
72			ap++;
73		}
74	}
75	while ((p = *ap++) != NULL) {
76		while ((c = *p++) != '\0') {
77			if (c == '\\' && eflag) {
78				switch (*p++) {
79				case 'b':  c = '\b';  break;
80				case 'c':  return 0;		/* exit */
81				case 'f':  c = '\f';  break;
82				case 'n':  c = '\n';  break;
83				case 'r':  c = '\r';  break;
84				case 't':  c = '\t';  break;
85				case 'v':  c = '\v';  break;
86				case '\\':  break;		/* c = '\\' */
87				case '0':
88					c = 0;
89					count = 3;
90					while (--count >= 0 && (unsigned)(*p - '0') < 8)
91						c = (c << 3) + (*p++ - '0');
92					break;
93				default:
94					p--;
95					break;
96				}
97			}
98			putchar(c);
99		}
100		if (*ap)
101			putchar(' ');
102	}
103	if (! nflag)
104		putchar('\n');
105	return 0;
106}
107