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138 lines
4.4 KiB
C
138 lines
4.4 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 "internal.h"
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#include <stdio.h>
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static const char uname_usage[] =
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"echo [-neE] [ARG ...]\n\n"
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"Prints the specified ARGs to stdout\n\n"
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"Options:\n"
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"\t-n\tsuppress trailing newline\n"
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"\t-e\tinterpret backslash-escaped characters (i.e. \\t=tab etc)\n"
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"\t-E\tdisable interpretation of backslash-escaped characters\n";
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extern int
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echo_main(int argc, char** argv)
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{
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register char **ap;
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register char *p;
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register char c;
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int nflag = 0;
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int eflag = 0;
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ap = argv;
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if (argc)
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ap++;
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while ((p = *ap) != NULL && *p == '-') {
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if (strcmp(p, "-n")==0) {
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nflag = 1;
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} else if (strcmp(p, "-e")==0) {
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eflag = 1;
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} else if (strcmp(p, "-E")==0) {
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eflag = 0;
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}
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else if (strncmp(p, "--", 2)==0) {
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usage( uname_usage);
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}
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else break;
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ap++;
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}
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while ((p = *ap++) != NULL) {
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while ((c = *p++) != '\0') {
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if (c == '\\' && eflag) {
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switch (c = *p++) {
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case 'a': c = '\007'; break;
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case 'b': c = '\b'; break;
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case 'c': exit( 0); /* exit */
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case 'f': c = '\f'; break;
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case 'n': c = '\n'; break;
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case 'r': c = '\r'; break;
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case 't': c = '\t'; break;
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case 'v': c = '\v'; break;
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case '\\': break; /* c = '\\' */
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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c -= '0';
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if (*p >= '0' && *p <= '7')
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c = c * 8 + (*p++ - '0');
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if (*p >= '0' && *p <= '7')
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c = c * 8 + (*p++ - '0');
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break;
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default:
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p--;
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break;
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}
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}
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putchar(c);
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}
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if (*ap)
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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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exit( 0);
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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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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