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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 /* |
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24 |
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25 The functions listed below were adapted from a similar functions |
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26 from GNU Bash, the Bourne Again SHell, copyright (C) 1987, 1989, 1991 |
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27 Free Software Foundation, Inc. |
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28 |
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29 octave_env::do_absolute_pathname |
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30 octave_env::do_base_pathname |
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31 octave_env::do_chdir |
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32 octave_env::do_getcwd |
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33 octave_env::do_make_absolute |
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34 octave_env::do_polite_directory_format |
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35 octave_env::pathname_backup |
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36 |
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37 */ |
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38 |
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39 #ifdef HAVE_CONFIG_H |
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40 #include <config.h> |
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41 #endif |
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42 |
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43 #include <cerrno> |
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44 #include <cstdlib> |
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45 |
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46 #ifdef HAVE_UNISTD_H |
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47 #ifdef HAVE_SYS_TYPES_H |
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48 #include <sys/types.h> |
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49 #endif |
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50 #include <unistd.h> |
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51 #endif |
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52 |
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53 #ifdef HAVE_PWD_H |
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54 #include <pwd.h> |
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55 #endif |
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56 |
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57 #include "lo-error.h" |
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58 #include "lo-sysdep.h" |
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59 #include "lo-utils.h" |
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60 #include "oct-env.h" |
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61 |
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62 octave_env::octave_env (void) |
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63 : follow_symbolic_links (true), verbatim_pwd (true), |
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64 current_directory (), program_name (), program_invocation_name (), |
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65 user_name (), host_name () |
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66 { |
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67 // Get a real value for the current directory. |
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68 do_getcwd (); |
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69 |
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70 // Etc. |
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71 do_get_user_name (); |
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72 |
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73 do_get_host_name (); |
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74 } |
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75 |
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76 octave_env *octave_env::instance = 0; |
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77 |
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78 bool |
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79 octave_env::instance_ok (void) |
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80 { |
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81 bool retval = true; |
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82 |
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83 if (! instance) |
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84 instance = new octave_env (); |
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85 |
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86 if (! instance) |
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87 { |
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88 (*current_liboctave_error_handler) |
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89 ("unable to create current working directoy object!"); |
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90 |
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91 retval = false; |
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92 } |
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93 |
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94 return retval; |
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95 } |
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96 |
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97 string |
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98 octave_env::polite_directory_format (const string& name) |
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99 { |
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100 return (instance_ok ()) |
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101 ? instance->do_polite_directory_format (name) : string (); |
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102 } |
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103 |
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104 bool |
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105 octave_env::absolute_pathname (const string& s) |
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106 { |
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107 return (instance_ok ()) |
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108 ? instance->do_absolute_pathname (s) : false; |
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109 } |
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110 |
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111 string |
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112 octave_env::base_pathname (const string& s) |
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113 { |
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114 return (instance_ok ()) |
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115 ? instance->do_base_pathname (s) : string (); |
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116 } |
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117 |
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118 string |
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119 octave_env::make_absolute (const string& s, const string& dot_path) |
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120 { |
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121 return (instance_ok ()) |
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122 ? instance->do_make_absolute (s, dot_path) : string (); |
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123 } |
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124 |
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125 string |
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126 octave_env::getcwd () |
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127 { |
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128 return (instance_ok ()) |
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129 ? instance->do_getcwd () : string (); |
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130 } |
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131 |
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132 string |
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133 octave_env::get_home_directory () |
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134 { |
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135 return (instance_ok ()) |
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136 ? instance->do_get_home_directory () : string (); |
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137 } |
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138 |
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139 string |
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140 octave_env::get_program_name (void) |
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141 { |
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142 return (instance_ok ()) |
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143 ? instance->program_name : string (); |
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144 } |
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145 |
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146 string |
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147 octave_env::get_program_invocation_name (void) |
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148 { |
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149 return (instance_ok ()) |
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150 ? instance->program_invocation_name : string (); |
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151 } |
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152 |
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153 void |
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154 octave_env::set_program_name (const string& s) |
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155 { |
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156 if (instance_ok ()) |
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157 instance->do_set_program_name (s); |
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158 } |
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159 |
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160 string |
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161 octave_env::get_user_name (void) |
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162 { |
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163 return (instance_ok ()) |
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164 ? instance->do_get_user_name () : string (); |
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165 } |
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166 |
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167 string |
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168 octave_env::get_host_name (void) |
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169 { |
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170 return (instance_ok ()) |
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171 ? instance->do_get_host_name () : string (); |
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172 } |
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173 |
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174 // XXX FIXME XXX -- this leaves no way to distinguish between a |
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175 // variable that is not set and one that is set to the empty string. |
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176 // Is this a problem? |
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177 |
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178 string |
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179 octave_env::getenv (const string& name) |
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180 { |
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181 return (instance_ok ()) |
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182 ? instance->do_getenv (name) : string (); |
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183 } |
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184 |
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185 void |
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186 octave_env::putenv (const string& name, const string& value) |
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187 { |
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188 octave_putenv (name, value); |
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189 } |
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190 |
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191 bool |
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192 octave_env::chdir (const string& newdir) |
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193 { |
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194 return (instance_ok ()) |
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195 ? instance->do_chdir (newdir) : false; |
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196 } |
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197 |
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198 void |
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199 octave_env::do_set_program_name (const string& s) const |
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200 { |
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201 program_invocation_name = s; |
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202 |
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203 size_t pos = program_invocation_name.rfind ('/'); |
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204 |
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205 program_name = (pos == NPOS) |
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206 ? program_invocation_name : program_invocation_name.substr (pos+1); |
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207 } |
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208 |
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209 // Return a pretty pathname. If the first part of the pathname is the |
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210 // same as $HOME, then replace that with `~'. |
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211 |
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212 string |
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213 octave_env::do_polite_directory_format (const string& name) const |
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214 { |
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215 string retval; |
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216 |
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217 string home_dir = do_get_home_directory (); |
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218 |
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219 size_t len = home_dir.length (); |
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220 |
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221 if (len > 1 && home_dir.compare (name, 0, len) == 0 |
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222 && (name.length () == len || name[len] == '/')) |
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223 { |
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224 retval = "~"; |
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225 retval.append (name.substr (len)); |
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226 } |
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227 else |
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228 retval = name; |
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229 |
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230 return retval; |
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231 } |
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232 |
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233 // Return 1 if STRING contains an absolute pathname, else 0. |
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234 |
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235 bool |
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236 octave_env::do_absolute_pathname (const string& s) const |
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237 { |
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238 if (s.empty ()) |
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239 return 0; |
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240 |
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241 if (s[0] == '/') |
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242 return true; |
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243 |
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244 if (s[0] == '.') |
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245 { |
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246 if (s[1] == '\0' || s[1] == '/') |
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247 return true; |
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248 |
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249 if (s[1] == '.') |
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250 if (s[2] == '\0' || s[2] == '/') |
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251 return true; |
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252 } |
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253 |
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254 return false; |
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255 } |
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256 |
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257 // Return the `basename' of the pathname in STRING (the stuff after |
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258 // the last '/'). If STRING is not a full pathname, simply return it. |
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259 |
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260 string |
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261 octave_env::do_base_pathname (const string& s) const |
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262 { |
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263 if (! do_absolute_pathname (s)) |
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264 return s; |
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265 |
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266 size_t pos = s.rfind ('/'); |
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267 |
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268 if (pos == NPOS) |
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269 return s; |
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270 else |
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271 return s.substr (pos+1); |
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272 } |
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273 |
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274 // Turn STRING (a pathname) into an absolute pathname, assuming that |
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275 // DOT_PATH contains the symbolic location of '.'. |
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276 |
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277 string |
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278 octave_env::do_make_absolute (const string& s, const string& dot_path) const |
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279 { |
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280 #if defined (__EMX__) |
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281 if (s.length () > 1 && s[1] == ':') |
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282 return s; |
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283 #endif |
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284 |
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285 if (dot_path.empty () || s[0] == '/' || s.empty ()) |
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286 return s; |
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287 |
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288 string current_path = dot_path; |
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289 |
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290 if (current_path.empty ()) |
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291 current_path = "./"; |
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292 |
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293 size_t pos = current_path.length () - 1; |
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294 |
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295 if (current_path[pos] != '/') |
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296 current_path.append ("/"); |
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297 |
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298 size_t i = 0; |
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299 size_t slen = s.length (); |
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300 |
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301 while (i < slen) |
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302 { |
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303 if (s[i] == '.') |
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304 { |
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305 if (i + 1 == slen) |
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306 return current_path; |
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307 |
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308 if (s[i+1] == '/') |
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309 { |
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310 i += 2; |
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311 continue; |
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312 } |
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313 |
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314 if (s[i+1] == '.' && (i + 2 == slen || s[i+2] == '/')) |
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315 { |
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316 i += 2; |
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317 |
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318 if (i != slen) |
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319 i++; |
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320 |
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321 pathname_backup (current_path, 1); |
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322 |
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323 continue; |
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324 } |
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325 } |
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326 |
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327 size_t tmp = s.find ('/', i); |
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328 |
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329 if (tmp == NPOS) |
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330 { |
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331 current_path.append (s, i, tmp-i); |
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332 break; |
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333 } |
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334 else |
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335 { |
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336 current_path.append (s, i, tmp-i+1); |
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337 i = tmp + 1; |
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338 } |
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339 } |
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340 |
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341 return current_path; |
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342 } |
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343 |
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344 // Return a consed string which is the current working directory. |
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345 |
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346 string |
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347 octave_env::do_getcwd () |
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348 { |
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349 if (! follow_symbolic_links) |
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350 current_directory = ""; |
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351 |
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352 if (verbatim_pwd || current_directory.empty ()) |
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353 current_directory = ::octave_getcwd (); |
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354 |
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355 return current_directory; |
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356 } |
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357 |
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358 // This value is not cached because it can change while Octave is |
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359 // running. |
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360 |
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361 string |
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362 octave_env::do_get_home_directory (void) const |
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363 { |
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364 string hd = do_getenv ("HOME"); |
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365 |
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366 return hd.empty () ? string ("I have no home!") : hd; |
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367 } |
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368 |
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369 string |
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370 octave_env::do_get_user_name (void) const |
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371 { |
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372 // XXX FIXME XXX -- is it possible for this to change while Octave |
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373 // is running? |
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374 |
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375 if (user_name.empty ()) |
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376 { |
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377 struct passwd *entry = getpwuid (getuid ()); |
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378 |
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379 user_name = entry ? entry->pw_name : "I have no name!"; |
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380 } |
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381 |
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382 return user_name; |
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383 } |
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384 |
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385 string |
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386 octave_env::do_get_host_name (void) const |
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387 { |
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388 // XXX FIXME XXX -- is it possible for this to change while Octave |
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389 // is running? |
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390 |
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391 if (host_name.empty ()) |
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392 { |
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393 char hostname[256]; |
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394 |
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395 int status = gethostname (hostname, 255); |
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396 |
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397 host_name = (status < 0) ? "I have no host!" : hostname; |
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398 } |
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399 |
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400 return host_name; |
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401 } |
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402 |
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403 string |
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404 octave_env::do_getenv (const string& name) const |
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405 { |
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406 char *value = ::getenv (name.c_str ()); |
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407 |
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408 return value ? value : ""; |
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409 } |
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410 |
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411 // Do the work of changing to the directory NEWDIR. Handle symbolic |
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412 // link following, etc. |
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413 |
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414 bool |
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415 octave_env::do_chdir (const string& newdir) |
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416 { |
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417 bool retval = false; |
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418 |
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419 string tmp; |
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420 |
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421 if (follow_symbolic_links) |
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422 { |
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423 if (current_directory.empty ()) |
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424 do_getcwd (); |
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425 |
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426 if (current_directory.empty ()) |
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427 tmp = newdir; |
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428 else |
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429 tmp = do_make_absolute (newdir, current_directory); |
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430 |
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431 // Get rid of trailing `/'. |
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432 |
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433 size_t len = tmp.length (); |
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434 |
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435 if (len > 1) |
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436 { |
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437 if (tmp[--len] == '/') |
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438 tmp.resize (len); |
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439 } |
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440 |
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441 if (! ::octave_chdir (tmp)) |
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442 { |
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443 current_directory = tmp; |
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444 retval = true; |
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445 } |
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446 } |
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447 else |
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448 retval = (! ::octave_chdir (newdir)); |
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449 |
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450 return retval; |
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451 } |
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452 |
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453 // Remove the last N directories from PATH. |
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454 |
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455 void |
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456 octave_env::pathname_backup (string& path, int n) const |
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457 { |
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458 if (path.empty ()) |
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459 return; |
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460 |
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461 size_t i = path.length () - 1; |
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462 |
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463 while (n--) |
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464 { |
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465 while (path[i] == '/' && i > 0) |
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466 i--; |
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467 |
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468 while (path[i] != '/' && i > 0) |
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469 i--; |
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470 |
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471 i++; |
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472 } |
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473 |
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474 path.resize (i); |
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475 } |
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476 |
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477 void |
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478 octave_env::error (int err_num) const |
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479 { |
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480 (*current_liboctave_error_handler) ("%s", strerror (err_num)); |
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481 } |
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482 |
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483 void |
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484 octave_env::error (const string& s) const |
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485 { |
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486 (*current_liboctave_error_handler) ("%s", s.c_str ()); |
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487 } |
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488 |
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489 /* |
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490 ;;; Local Variables: *** |
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491 ;;; mode: C++ *** |
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492 ;;; End: *** |
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493 */ |
