1 | /* $NetBSD: echo.c,v 1.12 2005/02/06 04:43:43 perry Exp $ */ |
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2 | |
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3 | /*- |
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4 | * Copyright (c) 1991, 1993 |
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5 | * The Regents of the University of California. All rights reserved. |
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6 | * |
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7 | * This code is derived from software contributed to Berkeley by |
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8 | * Kenneth Almquist. |
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9 | * |
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10 | * Redistribution and use in source and binary forms, with or without |
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11 | * modification, are permitted provided that the following conditions |
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12 | * are met: |
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13 | * 1. Redistributions of source code must retain the above copyright |
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14 | * notice, this list of conditions and the following disclaimer. |
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15 | * 2. Redistributions in binary form must reproduce the above copyright |
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16 | * notice, this list of conditions and the following disclaimer in the |
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17 | * documentation and/or other materials provided with the distribution. |
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18 | * 3. Neither the name of the University nor the names of its contributors |
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19 | * may be used to endorse or promote products derived from this software |
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20 | * without specific prior written permission. |
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21 | * |
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22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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32 | * SUCH DAMAGE. |
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33 | * |
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34 | * @(#)echo.c 8.1 (Berkeley) 5/31/93 |
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35 | */ |
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36 | |
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37 | /* |
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38 | * Echo command. |
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39 | * |
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40 | * echo is steeped in tradition - several of them! |
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41 | * netbsd has supported 'echo [-n | -e] args' in spite of -e not being |
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42 | * documented anywhere. |
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43 | * Posix requires that -n be supported, output from strings containing |
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44 | * \ is implementation defined |
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45 | * The Single Unix Spec requires that \ escapes be treated as if -e |
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46 | * were set, but that -n not be treated as an option. |
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47 | * (ksh supports 'echo [-eEn] args', but not -- so that it is actually |
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48 | * impossible to actually output '-n') |
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49 | * |
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50 | * It is suggested that 'printf "%b" "string"' be used to get \ sequences |
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51 | * expanded. printf is now a builtin of netbsd's sh and csh. |
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52 | */ |
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53 | |
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54 | |
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55 | #ifdef HAVE_CONFIG_H |
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56 | #include "config.h" |
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57 | #endif |
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58 | |
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59 | #include <stdio.h> |
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60 | #include <unistd.h> |
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61 | #include <string.h> |
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62 | #include <errno.h> |
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63 | |
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64 | #include <rtems.h> |
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65 | #include <rtems/shell.h> |
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66 | #include "internal.h" |
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67 | |
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68 | |
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69 | |
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70 | static int rtems_shell_main_echo( |
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71 | int argc, |
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72 | char *argv[] |
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73 | ) |
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74 | { |
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75 | char **ap; |
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76 | char *p; |
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77 | char c; |
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78 | int count; |
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79 | int nflag = 0; |
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80 | int eflag = 0; |
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81 | |
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82 | ap = argv; |
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83 | if (argc) |
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84 | ap++; |
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85 | |
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86 | if ((p = *ap) != NULL) { |
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87 | if (!strcmp(p, "-n")) { |
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88 | nflag = 1; |
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89 | ap++; |
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90 | } else if (!strcmp(p, "-e")) { |
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91 | eflag = 1; |
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92 | ap++; |
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93 | } |
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94 | } |
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95 | |
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96 | while ((p = *ap++) != NULL) { |
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97 | while ((c = *p++) != '\0') { |
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98 | if (c == '\\' && eflag) { |
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99 | switch (*p++) { |
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100 | case 'a': c = '\a'; break; /* bell */ |
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101 | case 'b': c = '\b'; break; |
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102 | case 'c': return 0; /* exit */ |
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103 | case 'e': c = 033; break; /* escape */ |
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104 | case 'f': c = '\f'; break; |
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105 | case 'n': c = '\n'; break; |
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106 | case 'r': c = '\r'; break; |
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107 | case 't': c = '\t'; break; |
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108 | case 'v': c = '\v'; break; |
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109 | case '\\': break; /* c = '\\' */ |
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110 | case '0': |
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111 | c = 0; |
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112 | count = 3; |
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113 | while (--count >= 0 && (unsigned)(*p - '0') < 8) |
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114 | c = (c << 3) + (*p++ - '0'); |
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115 | break; |
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116 | default: |
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117 | /* Output the '/' and char following */ |
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118 | p--; |
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119 | break; |
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120 | } |
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121 | } |
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122 | putchar(c); |
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123 | } |
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124 | if (*ap) |
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125 | putchar(' '); |
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126 | } |
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127 | if (! nflag) |
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128 | putchar('\n'); |
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129 | return 0; |
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130 | } |
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131 | |
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132 | rtems_shell_cmd_t rtems_shell_ECHO_Command = { |
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133 | "echo", /* name */ |
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134 | "echo [args]", /* usage */ |
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135 | "misc", /* topic */ |
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136 | rtems_shell_main_echo, /* command */ |
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137 | NULL, /* alias */ |
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138 | NULL /* next */ |
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139 | }; |
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