diff options
Diffstat (limited to 'coreutils/echo.c')
| -rw-r--r-- | coreutils/echo.c | 153 |
1 files changed, 141 insertions, 12 deletions
diff --git a/coreutils/echo.c b/coreutils/echo.c index 0dbb32f28..a673bb07a 100644 --- a/coreutils/echo.c +++ b/coreutils/echo.c @@ -1,29 +1,158 @@ +/* vi: set sw=4 ts=4: */ /* - * echo applet implementation for busybox + * echo implementation for busybox * - * 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. + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. * - * 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. + * Licensed under GPLv2 or later, see file LICENSE in this tarball for 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 <stdlib.h> #include "busybox.h" +int bb_echo(int ATTRIBUTE_UNUSED 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; +} + int echo_main(int argc, char** argv) { (void)bb_echo(argc, argv); bb_fflush_stdout_and_exit(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 + */ |