| /* 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 "busybox.h" |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.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 index; |
| |
| /* |
| * 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 (index = 0; temp[index]; index++) |
| { |
| if (strrchr("neE", temp[index]) == 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) { |
| 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 |
| */ |