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 version did not allow 4-digit octals.
31 int bb_echo(int ATTRIBUTE_UNUSED argc, char **argv)
33 #ifndef CONFIG_FEATURE_FANCY_ECHO
41 while (*++argv && (**argv == '-')) {
42 /* If it appears that we are handling options, then make sure
43 * that all of the options specified are actually valid.
44 * Otherwise, the string should just be echoed.
47 if (!*(p = *argv + 1)) { /* A single '-', so echo it. */
52 if (strrchr("neE", *p) == 0) {
57 /* All of the options in this arg are valid, so handle them. */
62 } else if (*p == 'e') {
75 while ((c = *(*argv)++)) {
76 if (c == eflag) { /* Check for escape seq. */
78 /* '\c' means cancel newline and
79 * ignore all subsequent chars. */
82 #ifndef CONFIG_FEATURE_FANCY_ECHO
83 /* SUSv3 specifies that octal escapes must begin with '0'. */
84 if (((unsigned int)(**argv - '1')) >= 7)
87 /* Since SUSv3 mandates a first digit of 0, 4-digit octals
88 * of the form \0### are accepted. */
89 if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) {
92 /* bb_process_escape_sequence can handle nul correctly */
93 c = bb_process_escape_sequence((const char **) argv);
104 #ifdef CONFIG_FEATURE_FANCY_ECHO
115 * Copyright (c) 1991, 1993
116 * The Regents of the University of California. All rights reserved.
118 * This code is derived from software contributed to Berkeley by
121 * Redistribution and use in source and binary forms, with or without
122 * modification, are permitted provided that the following conditions
124 * 1. Redistributions of source code must retain the above copyright
125 * notice, this list of conditions and the following disclaimer.
126 * 2. Redistributions in binary form must reproduce the above copyright
127 * notice, this list of conditions and the following disclaimer in the
128 * documentation and/or other materials provided with the distribution.
130 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
131 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
133 * California, Berkeley and its contributors.
134 * 4. Neither the name of the University nor the names of its contributors
135 * may be used to endorse or promote products derived from this software
136 * without specific prior written permission.
138 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
139 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
140 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
141 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
142 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
143 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
144 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
145 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
146 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
147 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
150 * @(#)echo.c 8.1 (Berkeley) 5/31/93