1 /* vi: set sw=4 ts=4: */
3 * echo implementation for busybox
5 * Copyright (c) 1991, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * Original copyright notice is retained at the end of this file.
28 static const char uname_usage[] =
29 "echo [-neE] [ARG ...]\n\n"
30 "Prints the specified ARGs to stdout\n\n"
32 "\t-n\tsuppress trailing newline\n"
33 "\t-e\tinterpret backslash-escaped characters (i.e. \\t=tab etc)\n"
34 "\t-E\tdisable interpretation of backslash-escaped characters\n";
37 echo_main(int argc, char** argv)
48 while ((p = *ap) != NULL && *p == '-') {
49 if (strcmp(p, "-n")==0) {
51 } else if (strcmp(p, "-e")==0) {
53 } else if (strcmp(p, "-E")==0) {
56 else if (strncmp(p, "--", 2)==0) {
62 while ((p = *ap++) != NULL) {
63 while ((c = *p++) != '\0') {
64 if (c == '\\' && eflag) {
66 case 'a': c = '\007'; break;
67 case 'b': c = '\b'; break;
68 case 'c': exit( 0); /* exit */
69 case 'f': c = '\f'; break;
70 case 'n': c = '\n'; break;
71 case 'r': c = '\r'; break;
72 case 't': c = '\t'; break;
73 case 'v': c = '\v'; break;
74 case '\\': break; /* c = '\\' */
75 case '0': case '1': case '2': case '3':
76 case '4': case '5': case '6': case '7':
78 if (*p >= '0' && *p <= '7')
79 c = c * 8 + (*p++ - '0');
80 if (*p >= '0' && *p <= '7')
81 c = c * 8 + (*p++ - '0');
100 * Copyright (c) 1991, 1993
101 * The Regents of the University of California. All rights reserved.
103 * This code is derived from software contributed to Berkeley by
106 * Redistribution and use in source and binary forms, with or without
107 * modification, are permitted provided that the following conditions
109 * 1. Redistributions of source code must retain the above copyright
110 * notice, this list of conditions and the following disclaimer.
111 * 2. Redistributions in binary form must reproduce the above copyright
112 * notice, this list of conditions and the following disclaimer in the
113 * documentation and/or other materials provided with the distribution.
114 * 3. All advertising materials mentioning features or use of this software
115 * must display the following acknowledgement:
116 * This product includes software developed by the University of
117 * California, Berkeley and its contributors.
118 * 4. Neither the name of the University nor the names of its contributors
119 * may be used to endorse or promote products derived from this software
120 * without specific prior written permission.
122 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
123 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
124 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
125 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
126 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
127 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
128 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
129 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
130 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
131 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
134 * @(#)echo.c 8.1 (Berkeley) 5/31/93