1 | /* |
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2 | * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation |
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3 | * Copyright (C) 1999, 2000 Red Hat, Inc. |
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4 | * All rights reserved. |
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5 | * |
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6 | * This file is part of the Gnome Library. |
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7 | * |
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8 | * The Gnome Library is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Library General Public License as |
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10 | * published by the Free Software Foundation; either version 2 of the |
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11 | * License, or (at your option) any later version. |
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12 | * |
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13 | * The Gnome Library is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Library General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Library General Public |
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19 | * License along with the Gnome Library; see the file COPYING.LIB. If not, |
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20 | * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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21 | * Boston, MA 02111-1307, USA. |
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22 | */ |
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23 | /* |
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24 | @NOTATION@ |
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25 | */ |
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26 | |
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27 | /* |
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28 | * |
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29 | * Gnome utility routines. |
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30 | * (C) 1997, 1998, 1999 the Free Software Foundation. |
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31 | * |
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32 | * Author: Miguel de Icaza, |
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33 | */ |
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34 | #include <config.h> |
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35 | |
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36 | /* needed for S_ISLNK with 'gcc -ansi -pedantic' on GNU/Linux */ |
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37 | #ifndef _BSD_SOURCE |
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38 | # define _BSD_SOURCE 1 |
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39 | #endif |
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40 | #include <sys/types.h> |
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41 | |
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42 | #include <errno.h> |
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43 | #include <stdarg.h> |
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44 | #include <stdlib.h> |
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45 | #include <stdio.h> |
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46 | #include <string.h> |
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47 | #include <unistd.h> |
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48 | #include <glib.h> |
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49 | #include <sys/stat.h> |
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50 | #include <pwd.h> |
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51 | #include <limits.h> |
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52 | #include <libgnome/gnome-program.h> |
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53 | #include <libgnome/gnome-util.h> |
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54 | |
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55 | /** |
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56 | * gnome_util_user_shell: |
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57 | * |
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58 | * Retrieves the user's preferred shell. |
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59 | * |
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60 | * Returns: A newly allocated string that is the path to the shell. |
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61 | */ |
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62 | char * |
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63 | gnome_util_user_shell (void) |
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64 | { |
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65 | struct passwd *pw; |
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66 | int i; |
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67 | const char *shell; |
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68 | static char *shells [] = { |
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69 | /* Note that on some systems shells can also |
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70 | * be installed in /usr/bin */ |
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71 | "/bin/bash", "/usr/bin/bash", |
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72 | "/bin/zsh", "/usr/bin/zsh", |
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73 | "/bin/tcsh", "/usr/bin/tcsh", |
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74 | "/bin/ksh", "/usr/bin/ksh", |
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75 | "/bin/csh", "/bin/sh", 0 |
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76 | }; |
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77 | |
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78 | if (geteuid () == getuid () && |
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79 | getegid () == getgid ()) { |
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80 | /* only in non-setuid */ |
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81 | if ((shell = g_getenv ("SHELL"))){ |
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82 | return g_strdup (shell); |
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83 | } |
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84 | } |
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85 | pw = getpwuid(getuid()); |
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86 | if (pw && pw->pw_shell) { |
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87 | return g_strdup (pw->pw_shell); |
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88 | } |
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89 | |
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90 | for (i = 0; shells [i]; i++) { |
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91 | if (access (shells [i], X_OK) == 0) { |
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92 | return g_strdup (shells[i]); |
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93 | } |
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94 | } |
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95 | |
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96 | /* If /bin/sh doesn't exist, your system is truly broken. */ |
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97 | abort (); |
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98 | |
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99 | /* Placate compiler. */ |
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100 | return NULL; |
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101 | } |
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102 | |
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103 | /** |
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104 | * g_extension_pointer: |
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105 | * @path: A filename or file path. |
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106 | * |
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107 | * Extracts the extension from the end of a filename (the part after the final |
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108 | * '.' in the filename). |
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109 | * |
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110 | * Returns: A pointer to the extension part of the filename, or a |
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111 | * pointer to the end of the string if the filename does not |
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112 | * have an extension. |
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113 | */ |
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114 | const char * |
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115 | g_extension_pointer (const char * path) |
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116 | { |
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117 | char * s, * t; |
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118 | |
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119 | g_return_val_if_fail(path != NULL, NULL); |
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120 | |
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121 | /* get the dot in the last element of the path */ |
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122 | t = strrchr(path, G_DIR_SEPARATOR); |
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123 | if (t != NULL) |
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124 | s = strrchr(t, '.'); |
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125 | else |
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126 | s = strrchr(path, '.'); |
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127 | |
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128 | if (s == NULL) |
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129 | return path + strlen(path); /* There is no extension. */ |
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130 | else { |
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131 | ++s; /* pass the . */ |
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132 | return s; |
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133 | } |
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134 | } |
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135 | |
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136 | /** |
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137 | * gnome_setenv: |
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138 | * @name: An environment variable name. |
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139 | * @value: The value to assign to the environment variable. |
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140 | * @overwrite: If %TRUE, overwrite the existing @name variable in the |
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141 | * environment. |
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142 | * |
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143 | * Adds "@name=@value" to the environment. Note that on systems without setenv, |
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144 | * this leaks memory so please do not use inside a loop or anything like that. |
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145 | * The semantics are the same as the glibc setenv() (if setenv() exists, it is |
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146 | * used). |
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147 | * |
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148 | * If @overwrite is %FALSE and the variable already exists in the environment, |
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149 | * then %0 is returned and the value is not changed. |
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150 | * |
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151 | * Returns: %0 on success, %-1 on error |
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152 | * |
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153 | **/ |
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154 | int |
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155 | gnome_setenv (const char *name, const char *value, gboolean overwrite) |
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156 | { |
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157 | #if defined (HAVE_SETENV) |
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158 | return setenv (name, value != NULL ? value : "", overwrite); |
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159 | #else |
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160 | char *string; |
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161 | |
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162 | if (! overwrite && g_getenv (name) != NULL) { |
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163 | return 0; |
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164 | } |
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165 | |
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166 | /* This results in a leak when you overwrite existing |
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167 | * settings. It would be fairly easy to fix this by keeping |
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168 | * our own parallel array or hash table. |
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169 | */ |
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170 | string = g_strconcat (name, "=", value, NULL); |
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171 | return putenv (string); |
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172 | #endif |
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173 | } |
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174 | |
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175 | /** |
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176 | * gnome_unsetenv: |
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177 | * @name: The environment variable to unset. |
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178 | * |
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179 | * Description: Removes @name from the environment. |
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180 | * In case there is no native implementation of unsetenv, |
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181 | * this could cause leaks depending on the implementation of |
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182 | * environment. |
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183 | * |
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184 | **/ |
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185 | void |
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186 | gnome_unsetenv (const char *name) |
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187 | { |
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188 | #if defined (HAVE_SETENV) |
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189 | unsetenv (name); |
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190 | #else |
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191 | extern char **environ; |
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192 | int i, len; |
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193 | |
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194 | len = strlen (name); |
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195 | |
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196 | /* Mess directly with the environ array. |
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197 | * This seems to be the only portable way to do this. |
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198 | */ |
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199 | for (i = 0; environ[i] != NULL; i++) { |
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200 | if (strncmp (environ[i], name, len) == 0 |
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201 | && environ[i][len + 1] == '=') { |
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202 | break; |
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203 | } |
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204 | } |
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205 | while (environ[i] != NULL) { |
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206 | environ[i] = environ[i + 1]; |
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207 | i++; |
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208 | } |
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209 | #endif |
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210 | } |
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211 | |
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212 | /** |
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213 | * gnome_clearenv: |
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214 | * |
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215 | * Description: Clears out the environment completely. |
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216 | * In case there is no native implementation of clearenv, |
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217 | * this could cause leaks depending on the implementation |
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218 | * of environment. |
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219 | * |
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220 | **/ |
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221 | void |
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222 | gnome_clearenv (void) |
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223 | { |
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224 | #ifdef HAVE_CLEARENV |
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225 | clearenv (); |
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226 | #else |
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227 | extern char **environ; |
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228 | environ[0] = NULL; |
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229 | #endif |
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230 | } |
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231 | |
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232 | |
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233 | /* Deprecated: */ |
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234 | /** |
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235 | * gnome_is_program_in_path: |
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236 | * @program: A program name. |
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237 | * |
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238 | * Deprecated, use #g_find_program_in_path |
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239 | * |
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240 | * Returns: %NULL if program is not on the path or a string |
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241 | * allocated with g_malloc() with the full path name of the program |
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242 | * found. |
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243 | */ |
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244 | |
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