1 /* vi: set sw=4 ts=4: */
3 * echo implementation for busybox - used as a helper for testsuite/*
4 * on systems lacking "echo -en"
6 * Copyright (c) 1991, 1993
7 * The Regents of the University of California. All rights reserved.
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 * Original copyright notice is retained at the end of this file.
14 /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
15 /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
17 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
19 * Because of behavioral differences, implemented configurable SUSv3
20 * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
21 * 1) In handling '\c' escape, the previous version only suppressed the
22 * trailing newline. SUSv3 specifies _no_ output after '\c'.
23 * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
24 * The previous version did not allow 4-digit octals.
31 #define WANT_HEX_ESCAPES 1
33 /* Usual "this only works for ascii compatible encodings" disclaimer. */
35 #define _tolower(X) ((X)|((char) 0x20))
37 static char bb_process_escape_sequence(const char **ptr)
39 static const char charmap[] = {
40 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
41 '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
45 unsigned int num_digits;
55 #ifdef WANT_HEX_ESCAPES
64 d = (unsigned char)(*q) - '0';
65 #ifdef WANT_HEX_ESCAPES
67 d = (unsigned char)(_tolower(*q)) - 'a' + 10;
72 #ifdef WANT_HEX_ESCAPES
73 if ((base == 16) && (!--num_digits)) {
88 } while (++num_digits < 3);
90 if (num_digits == 0) { /* mnemonic escape sequence? */
98 n = *(p + (sizeof(charmap)/2));
107 int main(int argc, char **argv)
114 /* We must check that stdout is not closed. */
125 /* If it appears that we are handling options, then make sure
126 * that all of the options specified are actually valid.
127 * Otherwise, the string should just be echoed.
130 if (!*p) /* A single '-', so echo it. */
134 if (!strrchr("neE", *p))
138 /* All of the options in this arg are valid, so handle them. */
149 /* arg is already == *argv and isn't NULL */
153 /* optimization for very common case */
155 } else while ((c = *arg++)) {
156 if (c == eflag) { /* Check for escape seq. */
158 /* '\c' means cancel newline and
159 * ignore all subsequent chars. */
163 /* Since SUSv3 mandates a first digit of 0, 4-digit octals
164 * of the form \0### are accepted. */
166 /* NB: don't turn "...\0" into "...\" */
167 if (arg[1] && ((unsigned char)(arg[1]) - '0') < 8) {
171 /* bb_process_escape_sequence handles NUL correctly
173 c = bb_process_escape_sequence(&arg);
194 * Copyright (c) 1991, 1993
195 * The Regents of the University of California. All rights reserved.
197 * This code is derived from software contributed to Berkeley by
200 * Redistribution and use in source and binary forms, with or without
201 * modification, are permitted provided that the following conditions
203 * 1. Redistributions of source code must retain the above copyright
204 * notice, this list of conditions and the following disclaimer.
205 * 2. Redistributions in binary form must reproduce the above copyright
206 * notice, this list of conditions and the following disclaimer in the
207 * documentation and/or other materials provided with the distribution.
209 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
210 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
212 * California, Berkeley and its contributors.
213 * 4. Neither the name of the University nor the names of its contributors
214 * may be used to endorse or promote products derived from this software
215 * without specific prior written permission.
217 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
218 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
219 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
220 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
221 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
222 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
223 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
224 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
225 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
226 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
229 * @(#)echo.c 8.1 (Berkeley) 5/31/93