1 /*-
2 * Copyright (c) 1991 The Regents of the University of California.
3 * 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 5.2 (Berkeley) 3/13/91
37 */
38
39 /*
40 * Echo command.
41 */
42
43 #define main echocmd
44
45 #include "bltin.h"
46
47 /* #define eflag 1 */
48
main(argc,argv)49 main(argc, argv) char **argv; {
50 register char **ap;
51 register char *p;
52 register char c;
53 int count;
54 int nflag = 0;
55 #ifndef eflag
56 int eflag = 0;
57 #endif
58
59 ap = argv;
60 if (argc)
61 ap++;
62 if ((p = *ap) != NULL) {
63 if (equal(p, "-n")) {
64 nflag++;
65 ap++;
66 } else if (equal(p, "-e")) {
67 #ifndef eflag
68 eflag++;
69 #endif
70 ap++;
71 }
72 }
73 while ((p = *ap++) != NULL) {
74 while ((c = *p++) != '\0') {
75 if (c == '\\' && eflag) {
76 switch (*p++) {
77 case 'b': c = '\b'; break;
78 case 'c': return 0; /* exit */
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 }
105