/* vi: set sw=4 ts=4: *//* * echo implementation for busybox * * Copyright (c) 1991, 1993 *	The Regents of the University of California.  All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Original copyright notice is retained at the end of this file. */#include <stdio.h>#include <string.h>#include <stdlib.h>#include "busybox.h"extern int echo_main(int argc, char** argv){	int nflag = 0;	int eflag = 0;	/* Skip argv[0]. */	argc--;	argv++;	while (argc > 0 && *argv[0] == '-')	{		register char *temp;		register int ix;		/*		 * If it appears that we are handling options, then make sure		 * that all of the options specified are actually valid.		 * Otherwise, the string should just be echoed.		 */		temp = argv[0] + 1;		for (ix = 0; temp[ix]; ix++)		{			if (strrchr("neE", temp[ix]) == 0)				goto just_echo;		}		if (!*temp)			goto just_echo;		/*		 * All of the options in temp are valid options to echo.		 * Handle them.		 */		while (*temp)		{			if (*temp == 'n')				nflag = 1;			else if (*temp == 'e')				eflag = 1;			else if (*temp == 'E')				eflag = 0;			else				goto just_echo;			temp++;		}		argc--;		argv++;	}just_echo:	while (argc > 0) {		const char *arg = argv[0];		register int c;		while ((c = *arg++)) {			/* Check for escape sequence. */			if (c == '\\' && eflag && *arg) {				if (*arg == 'c') {					/* '\c' means cancel newline. */					nflag = 1;					arg++;					continue;				} else {					c = process_escape_sequence(&arg);				}			}			putchar(c);		}		argc--;		argv++;		if (argc > 0)			putchar(' ');	}	if (!nflag)		putchar('\n');	fflush(stdout);	return EXIT_SUCCESS;}/*- * Copyright (c) 1991, 1993 *	The Regents of the University of California.  All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change  *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>  * *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * *	@(#)echo.c	8.1 (Berkeley) 5/31/93 */