[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * echo implementation for busybox
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| 4 | *
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| 5 | * Copyright (c) 1991, 1993
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| 6 | * The Regents of the University of California. All rights reserved.
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| 7 | *
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| 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 9 | *
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| 10 | * Original copyright notice is retained at the end of this file.
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| 11 | */
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| 12 |
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| 13 | /* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
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| 14 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
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| 15 |
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| 16 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 17 | *
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| 18 | * Because of behavioral differences, implemented configurable SUSv3
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| 19 | * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
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| 20 | * 1) In handling '\c' escape, the previous version only suppressed the
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| 21 | * trailing newline. SUSv3 specifies _no_ output after '\c'.
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| 22 | * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
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[1765] | 23 | * The previous version did not allow 4-digit octals.
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[821] | 24 | */
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| 25 |
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[1765] | 26 | #include "libbb.h"
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[821] | 27 |
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[1765] | 28 | int bb_echo(char **argv)
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[821] | 29 | {
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[1765] | 30 | const char *arg;
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| 31 | #if !ENABLE_FEATURE_FANCY_ECHO
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| 32 | enum {
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| 33 | eflag = '\\',
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| 34 | nflag = 1, /* 1 -- print '\n' */
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| 35 | };
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| 36 | arg = *++argv;
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| 37 | if (!arg)
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| 38 | goto newline_ret;
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[821] | 39 | #else
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| 40 | const char *p;
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[1765] | 41 | char nflag = 1;
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| 42 | char eflag = 0;
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[821] | 43 |
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[1765] | 44 | while (1) {
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| 45 | arg = *++argv;
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| 46 | if (!arg)
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| 47 | goto newline_ret;
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| 48 | if (*arg != '-')
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| 49 | break;
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| 50 |
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[821] | 51 | /* If it appears that we are handling options, then make sure
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| 52 | * that all of the options specified are actually valid.
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| 53 | * Otherwise, the string should just be echoed.
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| 54 | */
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[1765] | 55 | p = arg + 1;
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| 56 | if (!*p) /* A single '-', so echo it. */
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[821] | 57 | goto just_echo;
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| 58 |
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| 59 | do {
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[1765] | 60 | if (!strrchr("neE", *p))
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[821] | 61 | goto just_echo;
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| 62 | } while (*++p);
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| 63 |
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| 64 | /* All of the options in this arg are valid, so handle them. */
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[1765] | 65 | p = arg + 1;
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[821] | 66 | do {
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[1765] | 67 | if (*p == 'n')
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[821] | 68 | nflag = 0;
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[1765] | 69 | if (*p == 'e')
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[821] | 70 | eflag = '\\';
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| 71 | } while (*++p);
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| 72 | }
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[1765] | 73 | just_echo:
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[821] | 74 | #endif
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[1765] | 75 | while (1) {
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| 76 | /* arg is already == *argv and isn't NULL */
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| 77 | int c;
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[821] | 78 |
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[1765] | 79 | if (!eflag) {
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| 80 | /* optimization for very common case */
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| 81 | fputs(arg, stdout);
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| 82 | } else while ((c = *arg++)) {
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[821] | 83 | if (c == eflag) { /* Check for escape seq. */
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[1765] | 84 | if (*arg == 'c') {
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[821] | 85 | /* '\c' means cancel newline and
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| 86 | * ignore all subsequent chars. */
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[1765] | 87 | goto ret;
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[821] | 88 | }
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[1765] | 89 | #if !ENABLE_FEATURE_FANCY_ECHO
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[821] | 90 | /* SUSv3 specifies that octal escapes must begin with '0'. */
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[1765] | 91 | if ( (((unsigned char)*arg) - '1') >= 7)
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[821] | 92 | #endif
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| 93 | {
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| 94 | /* Since SUSv3 mandates a first digit of 0, 4-digit octals
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| 95 | * of the form \0### are accepted. */
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[1765] | 96 | if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
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| 97 | arg++;
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[821] | 98 | }
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| 99 | /* bb_process_escape_sequence can handle nul correctly */
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[1765] | 100 | c = bb_process_escape_sequence(&arg);
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[821] | 101 | }
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| 102 | }
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| 103 | putchar(c);
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| 104 | }
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| 105 |
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[1765] | 106 | arg = *++argv;
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| 107 | if (!arg)
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| 108 | break;
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| 109 | putchar(' ');
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[821] | 110 | }
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| 111 |
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[1765] | 112 | newline_ret:
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[821] | 113 | if (nflag) {
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| 114 | putchar('\n');
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| 115 | }
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[1765] | 116 | ret:
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| 117 | return fflush(stdout);
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[821] | 118 | }
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| 119 |
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[1765] | 120 | /* This is a NOFORK applet. Be very careful! */
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| 121 |
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| 122 | int echo_main(int argc, char** argv);
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[821] | 123 | int echo_main(int argc, char** argv)
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| 124 | {
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[1765] | 125 | return bb_echo(argv);
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[821] | 126 | }
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| 127 |
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| 128 | /*-
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| 129 | * Copyright (c) 1991, 1993
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| 130 | * The Regents of the University of California. All rights reserved.
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| 131 | *
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| 132 | * This code is derived from software contributed to Berkeley by
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| 133 | * Kenneth Almquist.
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| 134 | *
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| 135 | * Redistribution and use in source and binary forms, with or without
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| 136 | * modification, are permitted provided that the following conditions
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| 137 | * are met:
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| 138 | * 1. Redistributions of source code must retain the above copyright
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| 139 | * notice, this list of conditions and the following disclaimer.
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| 140 | * 2. Redistributions in binary form must reproduce the above copyright
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| 141 | * notice, this list of conditions and the following disclaimer in the
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| 142 | * documentation and/or other materials provided with the distribution.
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| 143 | *
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| 144 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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| 145 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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| 146 | *
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| 147 | * California, Berkeley and its contributors.
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| 148 | * 4. Neither the name of the University nor the names of its contributors
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| 149 | * may be used to endorse or promote products derived from this software
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| 150 | * without specific prior written permission.
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| 151 | *
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| 152 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 153 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 154 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 155 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 156 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 157 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 158 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 159 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 160 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 161 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 162 | * SUCH DAMAGE.
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| 163 | *
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| 164 | * @(#)echo.c 8.1 (Berkeley) 5/31/93
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| 165 | */
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