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"
30 #ifndef BB_FEATURE_TRIVIAL_HELP
31 "\nPrints the specified ARGs to stdout\n\n"
33 "\t-n\tsuppress trailing newline\n"
34 "\t-e\tinterpret backslash-escaped characters (i.e. \\t=tab etc)\n"
35 "\t-E\tdisable interpretation of backslash-escaped characters\n"
40 echo_main(int argc, char** argv)
51 while ((p = *ap) != NULL && *p == '-') {
52 if (strcmp(p, "-n")==0) {
54 } else if (strcmp(p, "-e")==0) {
56 } else if (strcmp(p, "-E")==0) {
59 else if (strncmp(p, "--", 2)==0) {
65 while ((p = *ap++) != NULL) {
66 while ((c = *p++) != '\0') {
67 if (c == '\\' && eflag) {
71 c = process_escape_sequence(&p);
85 * Copyright (c) 1991, 1993
86 * The Regents of the University of California. All rights reserved.
88 * This code is derived from software contributed to Berkeley by
91 * Redistribution and use in source and binary forms, with or without
92 * modification, are permitted provided that the following conditions
94 * 1. Redistributions of source code must retain the above copyright
95 * notice, this list of conditions and the following disclaimer.
96 * 2. Redistributions in binary form must reproduce the above copyright
97 * notice, this list of conditions and the following disclaimer in the
98 * documentation and/or other materials provided with the distribution.
99 * 3. All advertising materials mentioning features or use of this software
100 * must display the following acknowledgement:
101 * This product includes software developed by the University of
102 * California, Berkeley and its contributors.
103 * 4. Neither the name of the University nor the names of its contributors
104 * may be used to endorse or promote products derived from this software
105 * without specific prior written permission.
107 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
108 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
109 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
110 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
111 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
112 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
113 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
114 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
115 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
116 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
119 * @(#)echo.c 8.1 (Berkeley) 5/31/93