166 lines
5.2 KiB
C
166 lines
5.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* echo implementation for busybox
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Original copyright notice is retained at the end of this file.
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*/
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/* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Because of behavioral differences, implemented configureable SUSv3
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* or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
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* 1) In handling '\c' escape, the previous version only suppressed the
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* trailing newline. SUSv3 specifies _no_ output after '\c'.
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* 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
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* The previous version version did not allow 4-digit octals.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "busybox.h"
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extern int echo_main(int argc, char** argv)
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{
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#ifndef CONFIG_FEATURE_FANCY_ECHO
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#define eflag '\\'
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++argv;
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#else
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const char *p;
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int nflag = 1;
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int eflag = 0;
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while (*++argv && (**argv == '-')) {
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/* If it appears that we are handling options, then make sure
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* that all of the options specified are actually valid.
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* Otherwise, the string should just be echoed.
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*/
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if (!*(p = *argv + 1)) { /* A single '-', so echo it. */
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goto just_echo;
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}
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do {
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if (strrchr("neE", *p) == 0) {
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goto just_echo;
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}
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} while (*++p);
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/* All of the options in this arg are valid, so handle them. */
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p = *argv + 1;
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do {
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if (*p == 'n') {
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nflag = 0;
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} else if (*p == 'e') {
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eflag = '\\';
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} else {
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eflag = 0;
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}
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} while (*++p);
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}
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just_echo:
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#endif
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while (*argv) {
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register int c;
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while ((c = *(*argv)++)) {
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if (c == eflag) { /* Check for escape seq. */
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if (**argv == 'c') {
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/* '\c' means cancel newline and
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* ignore all subsequent chars. */
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goto DONE;
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}
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#ifndef CONFIG_FEATURE_FANCY_ECHO
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/* SUSv3 specifies that octal escapes must begin with '0'. */
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if (((unsigned int)(**argv - '1')) >= 7)
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#endif
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{
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/* Since SUSv3 mandates a first digit of 0, 4-digit octals
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* of the form \0### are accepted. */
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if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) {
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(*argv)++;
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}
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/* bb_process_escape_sequence can handle nul correctly */
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c = bb_process_escape_sequence((const char **) argv);
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}
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}
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putchar(c);
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}
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if (*++argv) {
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putchar(' ');
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}
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}
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#ifdef CONFIG_FEATURE_FANCY_ECHO
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if (nflag) {
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putchar('\n');
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}
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#else
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putchar('\n');
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#endif
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DONE:
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bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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*
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)echo.c 8.1 (Berkeley) 5/31/93
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*/
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