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https://github.com/topjohnwu/ndk-busybox.git
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151 lines
4.2 KiB
C
151 lines
4.2 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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#include "busybox.h"
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#include <stdio.h>
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extern int
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echo_main(int argc, char** argv)
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{
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int nflag = 0;
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int eflag = 0;
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/* Skip argv[0]. */
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argc--;
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argv++;
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while (argc > 0 && *argv[0] == '-')
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{
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register char *temp;
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register int index;
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/*
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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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temp = argv[0] + 1;
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for (index = 0; temp[index]; index++)
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{
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if (strrchr("neE", temp[index]) == 0)
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goto just_echo;
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}
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if (!*temp)
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goto just_echo;
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/*
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* All of the options in temp are valid options to echo.
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* Handle them.
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*/
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while (*temp)
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{
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if (*temp == 'n')
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nflag = 1;
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else if (*temp == 'e')
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eflag = 1;
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else if (*temp == 'E')
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eflag = 0;
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else
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goto just_echo;
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temp++;
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}
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argc--;
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argv++;
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}
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just_echo:
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while (argc > 0) {
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char *arg = argv[0];
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register int c;
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while ((c = *arg++)) {
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/* Check for escape sequence. */
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if (c == '\\' && eflag && *arg) {
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if (*arg == 'c') {
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/* '\c' means cancel newline. */
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nflag = 1;
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arg++;
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continue;
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} else {
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c = process_escape_sequence(&arg);
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}
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}
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putchar(c);
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}
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argc--;
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argv++;
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if (argc > 0)
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putchar(' ');
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}
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if (!nflag)
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putchar('\n');
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fflush(stdout);
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return 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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