/* 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. */ /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */ /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */ /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) * * Because of behavioral differences, implemented configurable SUSv3 * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs. * 1) In handling '\c' escape, the previous version only suppressed the * trailing newline. SUSv3 specifies _no_ output after '\c'. * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}. * The previous version version did not allow 4-digit octals. */ #include <stdio.h> #include <string.h> #include "busybox.h" extern int bb_echo(int argc, char** argv) { #ifndef CONFIG_FEATURE_FANCY_ECHO #define eflag '\\' ++argv; #else const char *p; int nflag = 1; int eflag = 0; while (*++argv && (**argv == '-')) { /* 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. */ if (!*(p = *argv + 1)) { /* A single '-', so echo it. */ goto just_echo; } do { if (strrchr("neE", *p) == 0) { goto just_echo; } } while (*++p); /* All of the options in this arg are valid, so handle them. */ p = *argv + 1; do { if (*p == 'n') { nflag = 0; } else if (*p == 'e') { eflag = '\\'; } else { eflag = 0; } } while (*++p); } just_echo: #endif while (*argv) { register int c; while ((c = *(*argv)++)) { if (c == eflag) { /* Check for escape seq. */ if (**argv == 'c') { /* '\c' means cancel newline and * ignore all subsequent chars. */ return 0; } #ifndef CONFIG_FEATURE_FANCY_ECHO /* SUSv3 specifies that octal escapes must begin with '0'. */ if (((unsigned int)(**argv - '1')) >= 7) #endif { /* Since SUSv3 mandates a first digit of 0, 4-digit octals * of the form \0### are accepted. */ if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) { (*argv)++; } /* bb_process_escape_sequence can handle nul correctly */ c = bb_process_escape_sequence((const char **) argv); } } putchar(c); } if (*++argv) { putchar(' '); } } #ifdef CONFIG_FEATURE_FANCY_ECHO if (nflag) { putchar('\n'); } #else putchar('\n'); #endif return 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. <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 */