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