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 source tree.
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.
32 #define WANT_HEX_ESCAPES 1
34 /* Usual "this only works for ascii compatible encodings" disclaimer. */
36 #define _tolower(X) ((X)|((char) 0x20))
38 static char bb_process_escape_sequence(const char **ptr)
40 static const char charmap[] = {
41 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', 0,
42 '\a', '\b', '\f', '\n', '\r', '\t', '\v', '\\', '\\' };
46 unsigned int num_digits;
56 #ifdef WANT_HEX_ESCAPES
65 d = (unsigned char)(*q) - '0';
66 #ifdef WANT_HEX_ESCAPES
68 d = (unsigned char)(_tolower(*q)) - 'a' + 10;
73 #ifdef WANT_HEX_ESCAPES
74 if ((base == 16) && (!--num_digits)) {
89 } while (++num_digits < 3);
91 if (num_digits == 0) { /* mnemonic escape sequence? */
99 n = *(p + (sizeof(charmap)/2));
108 int main(int argc, char **argv)
115 /* We must check that stdout is not closed. */
126 /* If it appears that we are handling options, then make sure
127 * that all of the options specified are actually valid.
128 * Otherwise, the string should just be echoed.
131 if (!*p) /* A single '-', so echo it. */
135 if (!strrchr("neE", *p))
139 /* All of the options in this arg are valid, so handle them. */
150 /* arg is already == *argv and isn't NULL */
154 /* optimization for very common case */
156 } else while ((c = *arg++)) {
157 if (c == eflag) { /* Check for escape seq. */
159 /* '\c' means cancel newline and
160 * ignore all subsequent chars. */
164 /* Since SUSv3 mandates a first digit of 0, 4-digit octals
165 * of the form \0### are accepted. */
167 /* NB: don't turn "...\0" into "...\" */
168 if (arg[1] && ((unsigned char)(arg[1]) - '0') < 8) {
172 /* bb_process_escape_sequence handles NUL correctly
174 c = bb_process_escape_sequence(&arg);
195 * Copyright (c) 1991, 1993
196 * The Regents of the University of California. All rights reserved.
198 * This code is derived from software contributed to Berkeley by
201 * Redistribution and use in source and binary forms, with or without
202 * modification, are permitted provided that the following conditions
204 * 1. Redistributions of source code must retain the above copyright
205 * notice, this list of conditions and the following disclaimer.
206 * 2. Redistributions in binary form must reproduce the above copyright
207 * notice, this list of conditions and the following disclaimer in the
208 * documentation and/or other materials provided with the distribution.
210 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
211 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
213 * California, Berkeley and its contributors.
214 * 4. Neither the name of the University nor the names of its contributors
215 * may be used to endorse or promote products derived from this software
216 * without specific prior written permission.
218 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
219 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
220 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
221 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
222 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
223 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
224 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
225 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
226 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
227 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
230 * @(#)echo.c 8.1 (Berkeley) 5/31/93