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166 lines
4.8 KiB
C
166 lines
4.8 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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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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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/* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Because of behavioral differences, implemented configurable SUSv3
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* or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
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* 1) In handling '\c' escape, the previous version only suppressed the
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* trailing newline. SUSv3 specifies _no_ output after '\c'.
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* 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
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* The previous version did not allow 4-digit octals.
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*/
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#include "libbb.h"
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int bb_echo(char **argv)
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{
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const char *arg;
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#if !ENABLE_FEATURE_FANCY_ECHO
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enum {
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eflag = '\\',
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nflag = 1, /* 1 -- print '\n' */
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};
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arg = *++argv;
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if (!arg)
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goto newline_ret;
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#else
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const char *p;
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char nflag = 1;
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char eflag = 0;
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while (1) {
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arg = *++argv;
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if (!arg)
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goto newline_ret;
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if (*arg != '-')
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break;
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/* If it appears that we are handling options, then make sure
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* that all of the options specified are actually valid.
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* Otherwise, the string should just be echoed.
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*/
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p = arg + 1;
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if (!*p) /* A single '-', so echo it. */
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goto just_echo;
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do {
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if (!strrchr("neE", *p))
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goto just_echo;
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} while (*++p);
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/* All of the options in this arg are valid, so handle them. */
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p = arg + 1;
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do {
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if (*p == 'n')
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nflag = 0;
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if (*p == 'e')
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eflag = '\\';
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} while (*++p);
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}
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just_echo:
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#endif
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while (1) {
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/* arg is already == *argv and isn't NULL */
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int c;
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if (!eflag) {
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/* optimization for very common case */
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fputs(arg, stdout);
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} else while ((c = *arg++)) {
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if (c == eflag) { /* Check for escape seq. */
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if (*arg == 'c') {
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/* '\c' means cancel newline and
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* ignore all subsequent chars. */
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goto ret;
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}
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#if !ENABLE_FEATURE_FANCY_ECHO
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/* SUSv3 specifies that octal escapes must begin with '0'. */
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if ( (((unsigned char)*arg) - '1') >= 7)
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#endif
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{
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/* Since SUSv3 mandates a first digit of 0, 4-digit octals
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* of the form \0### are accepted. */
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if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
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arg++;
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}
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/* bb_process_escape_sequence can handle nul correctly */
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c = bb_process_escape_sequence(&arg);
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}
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}
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putchar(c);
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}
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arg = *++argv;
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if (!arg)
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break;
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putchar(' ');
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}
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newline_ret:
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if (nflag) {
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putchar('\n');
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}
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ret:
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return fflush(stdout);
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}
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/* This is a NOFORK applet. Be very careful! */
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int echo_main(int argc, char** argv);
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int echo_main(int argc, char** argv)
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{
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return bb_echo(argv);
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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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*
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* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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*
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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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