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.
25 /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
26 /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
28 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
30 * Because of behavioral differences, implemented configurable SUSv3
31 * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
32 * 1) In handling '\c' escape, the previous version only suppressed the
33 * trailing newline. SUSv3 specifies _no_ output after '\c'.
34 * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
35 * The previous version version did not allow 4-digit octals.
43 extern int bb_echo(int argc, char** argv)
45 #ifndef CONFIG_FEATURE_FANCY_ECHO
53 while (*++argv && (**argv == '-')) {
54 /* If it appears that we are handling options, then make sure
55 * that all of the options specified are actually valid.
56 * Otherwise, the string should just be echoed.
59 if (!*(p = *argv + 1)) { /* A single '-', so echo it. */
64 if (strrchr("neE", *p) == 0) {
69 /* All of the options in this arg are valid, so handle them. */
74 } else if (*p == 'e') {
87 while ((c = *(*argv)++)) {
88 if (c == eflag) { /* Check for escape seq. */
90 /* '\c' means cancel newline and
91 * ignore all subsequent chars. */
94 #ifndef CONFIG_FEATURE_FANCY_ECHO
95 /* SUSv3 specifies that octal escapes must begin with '0'. */
96 if (((unsigned int)(**argv - '1')) >= 7)
99 /* Since SUSv3 mandates a first digit of 0, 4-digit octals
100 * of the form \0### are accepted. */
101 if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) {
104 /* bb_process_escape_sequence can handle nul correctly */
105 c = bb_process_escape_sequence((const char **) argv);
116 #ifdef CONFIG_FEATURE_FANCY_ECHO
127 * Copyright (c) 1991, 1993
128 * The Regents of the University of California. All rights reserved.
130 * This code is derived from software contributed to Berkeley by
133 * Redistribution and use in source and binary forms, with or without
134 * modification, are permitted provided that the following conditions
136 * 1. Redistributions of source code must retain the above copyright
137 * notice, this list of conditions and the following disclaimer.
138 * 2. Redistributions in binary form must reproduce the above copyright
139 * notice, this list of conditions and the following disclaimer in the
140 * documentation and/or other materials provided with the distribution.
142 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
143 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
145 * California, Berkeley and its contributors.
146 * 4. Neither the name of the University nor the names of its contributors
147 * may be used to endorse or promote products derived from this software
148 * without specific prior written permission.
150 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
151 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
152 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
153 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
154 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
155 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
156 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
157 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
158 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
159 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
162 * @(#)echo.c 8.1 (Berkeley) 5/31/93