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 * @(#)echo.c 8.2 (Berkeley) 5/4/95
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: head/bin/sh/bltin/echo.c 326025 2017-11-20 19:49:47Z pfg $");
39
40 /*
41 * Echo command.
42 */
43
44 #define main echocmd
45
46 #include "bltin.h"
47
48 /* #define eflag 1 */
49
50 int
main(int argc,char * argv[])51 main(int argc, char *argv[])
52 {
53 char **ap;
54 char *p;
55 char c;
56 int count;
57 int nflag = 0;
58 #ifndef eflag
59 int eflag = 0;
60 #endif
61
62 ap = argv;
63 if (argc)
64 ap++;
65 if ((p = *ap) != NULL) {
66 if (equal(p, "-n")) {
67 nflag++;
68 ap++;
69 } else if (equal(p, "-e")) {
70 #ifndef eflag
71 eflag++;
72 #endif
73 ap++;
74 }
75 }
76 while ((p = *ap++) != NULL) {
77 while ((c = *p++) != '\0') {
78 if (c == '\\' && eflag) {
79 switch (*p++) {
80 case 'a': c = '\a'; break;
81 case 'b': c = '\b'; break;
82 case 'c': return 0; /* exit */
83 case 'e': c = '\033'; break;
84 case 'f': c = '\f'; break;
85 case 'n': c = '\n'; break;
86 case 'r': c = '\r'; break;
87 case 't': c = '\t'; break;
88 case 'v': c = '\v'; break;
89 case '\\': break; /* c = '\\' */
90 case '0':
91 c = 0;
92 count = 3;
93 while (--count >= 0 && (unsigned)(*p - '0') < 8)
94 c = (c << 3) + (*p++ - '0');
95 break;
96 default:
97 p--;
98 break;
99 }
100 }
101 putchar(c);
102 }
103 if (*ap)
104 putchar(' ');
105 }
106 if (! nflag)
107 putchar('\n');
108 return 0;
109 }
110