1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)echo.c 8.2 (Berkeley) 5/4/95
37 * $Id: echo.c,v 1.3 1995/08/23 05:31:06 pst Exp $
38 */
39
40/*
41 * Echo command.
42 */
43
44#ifdef main
45#undef main
46#endif
47#define main echocmd
48
49#include "bltin.h"
50
51/* #define eflag 1 */
52
53int
54main(argc, argv)
55 int argc;
56 char **argv;
57{
58 register char **ap;
59 register char *p;
60 register char c;
61 int count;
62 int nflag = 0;
63#ifndef eflag
64 int eflag = 0;
65#endif
66
67 ap = argv;
68 if (argc)
69 ap++;
70 if ((p = *ap) != NULL) {
71 if (equal(p, "-n")) {
72 nflag++;
73 ap++;
74 } else if (equal(p, "-e")) {
75#ifndef eflag
76 eflag++;
77#endif
78 ap++;
79 }
80 }
81 while ((p = *ap++) != NULL) {
82 while ((c = *p++) != '\0') {
83 if (c == '\\' && eflag) {
84 switch (*p++) {
85 case 'b': c = '\b'; break;
86 case 'c': return 0; /* exit */
87 case 'f': c = '\f'; break;
88 case 'n': c = '\n'; break;
89 case 'r': c = '\r'; break;
90 case 't': c = '\t'; break;
91 case 'v': c = '\v'; break;
92 case '\\': break; /* c = '\\' */
93 case '0':
94 c = 0;
95 count = 3;
96 while (--count >= 0 && (unsigned)(*p - '0') < 8)
97 c = (c << 3) + (*p++ - '0');
98 break;
99 default:
100 p--;
101 break;
102 }
103 }
104 putchar(c);
105 }
106 if (*ap)
107 putchar(' ');
108 }
109 if (! nflag)
110 putchar('\n');
111 return 0;
112}