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 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 * Original copyright notice is retained at the end of this file.
13 /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
14 /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
16 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
18 * Because of behavioral differences, implemented configurable SUSv3
19 * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
20 * 1) In handling '\c' escape, the previous version only suppressed the
21 * trailing newline. SUSv3 specifies _no_ output after '\c'.
22 * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
23 * The previous version did not allow 4-digit octals.
28 int bb_echo(char **argv)
31 #if !ENABLE_FEATURE_FANCY_ECHO
46 /* If it appears that we are handling options, then make sure
47 * that all of the options specified are actually valid.
48 * Otherwise, the string should just be echoed.
51 if (!*p) /* A single '-', so echo it. */
55 if (!strrchr("neE", *p))
59 /* All of the options in this arg are valid, so handle them. */
71 /* arg is already = *argv and isn't NULL */
74 while ((c = *arg++)) {
75 if (c == eflag) { /* Check for escape seq. */
77 /* '\c' means cancel newline and
78 * ignore all subsequent chars. */
81 #if !ENABLE_FEATURE_FANCY_ECHO
82 /* SUSv3 specifies that octal escapes must begin with '0'. */
83 if ( (((unsigned char)*arg) - '1') >= 7)
86 /* Since SUSv3 mandates a first digit of 0, 4-digit octals
87 * of the form \0### are accepted. */
88 if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
91 /* bb_process_escape_sequence can handle nul correctly */
92 c = bb_process_escape_sequence(&arg);
104 #ifdef CONFIG_FEATURE_FANCY_ECHO
112 return fflush(stdout);
115 /* This is a NOFORK applet. Be very careful! */
117 int echo_main(int argc, char** argv);
118 int echo_main(int argc, char** argv)
120 return bb_echo(argv);
124 * Copyright (c) 1991, 1993
125 * The Regents of the University of California. All rights reserved.
127 * This code is derived from software contributed to Berkeley by
130 * Redistribution and use in source and binary forms, with or without
131 * modification, are permitted provided that the following conditions
133 * 1. Redistributions of source code must retain the above copyright
134 * notice, this list of conditions and the following disclaimer.
135 * 2. Redistributions in binary form must reproduce the above copyright
136 * notice, this list of conditions and the following disclaimer in the
137 * documentation and/or other materials provided with the distribution.
139 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
140 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
142 * California, Berkeley and its contributors.
143 * 4. Neither the name of the University nor the names of its contributors
144 * may be used to endorse or promote products derived from this software
145 * without specific prior written permission.
147 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
148 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
149 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
150 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
151 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
152 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
153 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
154 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
155 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
156 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
159 * @(#)echo.c 8.1 (Berkeley) 5/31/93