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 <sys/cdefs.h>
36/*
37 * Echo command.
38 */
39
40#define main echocmd
41
42#include "bltin.h"
43
44/* #define eflag 1 */
45
46int
47main(int argc, char *argv[])
48{
49	char **ap;
50	char *p;
51	char c;
52	int count;
53	int nflag = 0;
54#ifndef eflag
55	int eflag = 0;
56#endif
57
58	ap = argv;
59	if (argc)
60		ap++;
61	if ((p = *ap) != NULL) {
62		if (equal(p, "-n")) {
63			nflag++;
64			ap++;
65		} else if (equal(p, "-e")) {
66#ifndef eflag
67			eflag++;
68#endif
69			ap++;
70		}
71	}
72	while ((p = *ap++) != NULL) {
73		while ((c = *p++) != '\0') {
74			if (c == '\\' && eflag) {
75				switch (*p++) {
76				case 'a':  c = '\a';  break;
77				case 'b':  c = '\b';  break;
78				case 'c':  return 0;		/* exit */
79				case 'e':  c = '\033';  break;
80				case 'f':  c = '\f';  break;
81				case 'n':  c = '\n';  break;
82				case 'r':  c = '\r';  break;
83				case 't':  c = '\t';  break;
84				case 'v':  c = '\v';  break;
85				case '\\':  break;		/* c = '\\' */
86				case '0':
87					c = 0;
88					count = 3;
89					while (--count >= 0 && (unsigned)(*p - '0') < 8)
90						c = (c << 3) + (*p++ - '0');
91					break;
92				default:
93					p--;
94					break;
95				}
96			}
97			putchar(c);
98		}
99		if (*ap)
100			putchar(' ');
101	}
102	if (! nflag)
103		putchar('\n');
104	return 0;
105}
106