1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include "bltin.h"
36
37/*
38 * Echo command.
39 */
40
41#define main echocmd
42
43/* #define eflag 1 */
44
45int
46main(int argc, char *argv[])
47{
48 char **ap;
49 char *p;
50 char c;
51 int count;
52 int nflag = 0;
53#ifndef eflag
54 int eflag = 0;
55#endif
56
57 ap = argv;
58 if (argc)
59 ap++;
60 if ((p = *ap) != NULL) {
61 if (equal(p, "-n")) {
62 nflag++;
63 ap++;
64 } else if (equal(p, "-e")) {
65#ifndef eflag
66 eflag++;
67#endif
68 ap++;
69 }
70 }
71 while ((p = *ap++) != NULL) {
72 while ((c = *p++) != '\0') {
73 if (c == '\\' && eflag) {
74 switch (*p++) {
75 case 'a': c = '\a'; break;
76 case 'b': c = '\b'; break;
77 case 'c': return 0; /* exit */
78 case 'e': c = '\033'; break;
79 case 'f': c = '\f'; break;
80 case 'n': c = '\n'; break;
81 case 'r': c = '\r'; break;
82 case 't': c = '\t'; break;
83 case 'v': c = '\v'; break;
84 case '\\': break; /* c = '\\' */
85 case '0':
86 c = 0;
87 count = 3;
88 while (--count >= 0 && (unsigned)(*p - '0') < 8)
89 c = (c << 3) + (*p++ - '0');
90 break;
91 default:
92 p--;
93 break;
94 }
95 }
96 putchar(c);
97 }
98 if (*ap)
99 putchar(' ');
100 }
101 if (! nflag)
102 putchar('\n');
103 return 0;
104}
