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Diffstat (limited to 'echo.c')
| -rw-r--r-- | echo.c | 126 |
1 files changed, 126 insertions, 0 deletions
@@ -0,0 +1,126 @@ +/* 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 "internal.h" +#include <stdio.h> + +extern int +echo_main(int argc, char** argv) +{ + register char **ap; + register char *p; + register char c; + int nflag = 0; + int eflag = 0; + + ap = argv; + if (argc) + ap++; + while ((p = *ap) != NULL && *p == '-') { + if (strcmp(p, "-n")==0) { + nflag = 1; + } else if (strcmp(p, "-e")==0) { + eflag = 1; + } else if (strcmp(p, "-E")==0) { + eflag = 0; + } + else break; + ap++; + } + while ((p = *ap++) != NULL) { + while ((c = *p++) != '\0') { + if (c == '\\' && eflag) { + switch (c = *p++) { + case 'a': c = '\007'; break; + case 'b': c = '\b'; break; + case 'c': exit( 0); /* exit */ + case 'f': c = '\f'; break; + case 'n': c = '\n'; break; + case 'r': c = '\r'; break; + case 't': c = '\t'; break; + case 'v': c = '\v'; break; + case '\\': break; /* c = '\\' */ + case '0': case '1': case '2': case '3': + case '4': case '5': case '6': case '7': + c -= '0'; + if (*p >= '0' && *p <= '7') + c = c * 8 + (*p++ - '0'); + if (*p >= '0' && *p <= '7') + c = c * 8 + (*p++ - '0'); + break; + default: + p--; + break; + } + } + putchar(c); + } + if (*ap) + putchar(' '); + } + if (! nflag) + putchar('\n'); + fflush(stdout); + exit( 0); +} + +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * 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 + */ + + |