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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23 | * The previous version version did not allow 4-digit octals.
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24 | */
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25 |
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26 |
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27 | #include <stdio.h>
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28 | #include <string.h>
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29 | #include <stdlib.h>
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30 | #include "busybox.h"
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31 |
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32 | int bb_echo(int ATTRIBUTE_UNUSED argc, char **argv)
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33 | {
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34 | #ifndef CONFIG_FEATURE_FANCY_ECHO
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35 | #define eflag '\\'
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36 | ++argv;
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37 | #else
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38 | const char *p;
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39 | int nflag = 1;
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40 | int eflag = 0;
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41 |
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42 | while (*++argv && (**argv == '-')) {
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43 | /* If it appears that we are handling options, then make sure
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44 | * that all of the options specified are actually valid.
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45 | * Otherwise, the string should just be echoed.
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46 | */
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47 |
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48 | if (!*(p = *argv + 1)) { /* A single '-', so echo it. */
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49 | goto just_echo;
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50 | }
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51 |
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52 | do {
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53 | if (strrchr("neE", *p) == 0) {
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54 | goto just_echo;
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55 | }
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56 | } while (*++p);
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57 |
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58 | /* All of the options in this arg are valid, so handle them. */
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59 | p = *argv + 1;
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60 | do {
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61 | if (*p == 'n') {
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62 | nflag = 0;
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63 | } else if (*p == 'e') {
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64 | eflag = '\\';
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65 | } else {
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66 | eflag = 0;
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67 | }
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68 | } while (*++p);
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69 | }
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70 |
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71 | just_echo:
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72 | #endif
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73 | while (*argv) {
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74 | register int c;
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75 |
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76 | while ((c = *(*argv)++)) {
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77 | if (c == eflag) { /* Check for escape seq. */
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78 | if (**argv == 'c') {
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79 | /* '\c' means cancel newline and
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80 | * ignore all subsequent chars. */
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81 | return 0;
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82 | }
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83 | #ifndef CONFIG_FEATURE_FANCY_ECHO
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84 | /* SUSv3 specifies that octal escapes must begin with '0'. */
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85 | if (((unsigned int)(**argv - '1')) >= 7)
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86 | #endif
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87 | {
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88 | /* Since SUSv3 mandates a first digit of 0, 4-digit octals
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89 | * of the form \0### are accepted. */
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90 | if ((**argv == '0') && (((unsigned int)(argv[0][1] - '0')) < 8)) {
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91 | (*argv)++;
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92 | }
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93 | /* bb_process_escape_sequence can handle nul correctly */
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94 | c = bb_process_escape_sequence((const char **) argv);
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95 | }
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96 | }
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97 | putchar(c);
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98 | }
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99 |
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100 | if (*++argv) {
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101 | putchar(' ');
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102 | }
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103 | }
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104 |
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105 | #ifdef CONFIG_FEATURE_FANCY_ECHO
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106 | if (nflag) {
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107 | putchar('\n');
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108 | }
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109 | #else
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110 | putchar('\n');
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111 | #endif
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112 | return 0;
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113 | }
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114 |
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115 | int echo_main(int argc, char** argv)
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116 | {
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117 | (void)bb_echo(argc, argv);
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118 | bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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119 | }
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120 |
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121 | /*-
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122 | * Copyright (c) 1991, 1993
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123 | * The Regents of the University of California. All rights reserved.
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124 | *
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125 | * This code is derived from software contributed to Berkeley by
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126 | * Kenneth Almquist.
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127 | *
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128 | * Redistribution and use in source and binary forms, with or without
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129 | * modification, are permitted provided that the following conditions
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130 | * are met:
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131 | * 1. Redistributions of source code must retain the above copyright
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132 | * notice, this list of conditions and the following disclaimer.
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133 | * 2. Redistributions in binary form must reproduce the above copyright
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134 | * notice, this list of conditions and the following disclaimer in the
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135 | * documentation and/or other materials provided with the distribution.
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136 | *
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137 | * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
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138 | * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
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139 | *
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140 | * California, Berkeley and its contributors.
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141 | * 4. Neither the name of the University nor the names of its contributors
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142 | * may be used to endorse or promote products derived from this software
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143 | * without specific prior written permission.
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144 | *
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145 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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146 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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147 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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148 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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149 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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150 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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151 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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152 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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153 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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154 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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155 | * SUCH DAMAGE.
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156 | *
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157 | * @(#)echo.c 8.1 (Berkeley) 5/31/93
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158 | */
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