[18319] | 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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[20806] | 75 | "/bin/csh", "/bin/sh", NULL |
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[18319] | 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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[20806] | 82 | if (access (shell, X_OK) == 0) { |
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| 83 | return g_strdup (shell); |
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| 84 | } |
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[18319] | 85 | } |
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| 86 | } |
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| 87 | pw = getpwuid(getuid()); |
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| 88 | if (pw && pw->pw_shell) { |
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[20806] | 89 | if (access (pw->pw_shell, X_OK) == 0) { |
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| 90 | return g_strdup (pw->pw_shell); |
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| 91 | } |
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| 92 | } |
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[18319] | 93 | |
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| 94 | for (i = 0; shells [i]; i++) { |
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| 95 | if (access (shells [i], X_OK) == 0) { |
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| 96 | return g_strdup (shells[i]); |
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| 97 | } |
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| 98 | } |
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| 99 | |
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| 100 | /* If /bin/sh doesn't exist, your system is truly broken. */ |
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| 101 | abort (); |
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| 102 | |
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| 103 | /* Placate compiler. */ |
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| 104 | return NULL; |
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| 105 | } |
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| 106 | |
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| 107 | /** |
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| 108 | * g_extension_pointer: |
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| 109 | * @path: A filename or file path. |
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| 110 | * |
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| 111 | * Extracts the extension from the end of a filename (the part after the final |
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| 112 | * '.' in the filename). |
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| 113 | * |
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| 114 | * Returns: A pointer to the extension part of the filename, or a |
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| 115 | * pointer to the end of the string if the filename does not |
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| 116 | * have an extension. |
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| 117 | */ |
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| 118 | const char * |
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| 119 | g_extension_pointer (const char * path) |
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| 120 | { |
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| 121 | char * s, * t; |
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| 122 | |
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| 123 | g_return_val_if_fail(path != NULL, NULL); |
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| 124 | |
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| 125 | /* get the dot in the last element of the path */ |
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| 126 | t = strrchr(path, G_DIR_SEPARATOR); |
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| 127 | if (t != NULL) |
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| 128 | s = strrchr(t, '.'); |
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| 129 | else |
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| 130 | s = strrchr(path, '.'); |
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| 131 | |
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| 132 | if (s == NULL) |
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| 133 | return path + strlen(path); /* There is no extension. */ |
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| 134 | else { |
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| 135 | ++s; /* pass the . */ |
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| 136 | return s; |
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| 137 | } |
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| 138 | } |
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| 139 | |
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| 140 | /** |
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| 141 | * gnome_setenv: |
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| 142 | * @name: An environment variable name. |
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| 143 | * @value: The value to assign to the environment variable. |
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| 144 | * @overwrite: If %TRUE, overwrite the existing @name variable in the |
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| 145 | * environment. |
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| 146 | * |
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| 147 | * Adds "@name=@value" to the environment. Note that on systems without setenv, |
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| 148 | * this leaks memory so please do not use inside a loop or anything like that. |
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| 149 | * The semantics are the same as the glibc setenv() (if setenv() exists, it is |
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| 150 | * used). |
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| 151 | * |
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| 152 | * If @overwrite is %FALSE and the variable already exists in the environment, |
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| 153 | * then %0 is returned and the value is not changed. |
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| 154 | * |
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| 155 | * Returns: %0 on success, %-1 on error |
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| 156 | * |
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| 157 | **/ |
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| 158 | int |
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| 159 | gnome_setenv (const char *name, const char *value, gboolean overwrite) |
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| 160 | { |
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| 161 | #if defined (HAVE_SETENV) |
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| 162 | return setenv (name, value != NULL ? value : "", overwrite); |
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| 163 | #else |
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| 164 | char *string; |
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| 165 | |
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| 166 | if (! overwrite && g_getenv (name) != NULL) { |
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| 167 | return 0; |
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| 168 | } |
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| 169 | |
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| 170 | /* This results in a leak when you overwrite existing |
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| 171 | * settings. It would be fairly easy to fix this by keeping |
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| 172 | * our own parallel array or hash table. |
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| 173 | */ |
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| 174 | string = g_strconcat (name, "=", value, NULL); |
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| 175 | return putenv (string); |
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| 176 | #endif |
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| 177 | } |
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| 178 | |
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| 179 | /** |
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| 180 | * gnome_unsetenv: |
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| 181 | * @name: The environment variable to unset. |
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| 182 | * |
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| 183 | * Description: Removes @name from the environment. |
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| 184 | * In case there is no native implementation of unsetenv, |
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| 185 | * this could cause leaks depending on the implementation of |
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| 186 | * environment. |
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| 187 | * |
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| 188 | **/ |
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| 189 | void |
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| 190 | gnome_unsetenv (const char *name) |
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| 191 | { |
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[20806] | 192 | #if defined (HAVE_UNSETENV) |
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[18319] | 193 | unsetenv (name); |
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| 194 | #else |
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| 195 | extern char **environ; |
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| 196 | int i, len; |
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| 197 | |
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| 198 | len = strlen (name); |
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| 199 | |
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| 200 | /* Mess directly with the environ array. |
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| 201 | * This seems to be the only portable way to do this. |
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| 202 | */ |
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| 203 | for (i = 0; environ[i] != NULL; i++) { |
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| 204 | if (strncmp (environ[i], name, len) == 0 |
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| 205 | && environ[i][len + 1] == '=') { |
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| 206 | break; |
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| 207 | } |
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| 208 | } |
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| 209 | while (environ[i] != NULL) { |
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| 210 | environ[i] = environ[i + 1]; |
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| 211 | i++; |
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| 212 | } |
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| 213 | #endif |
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| 214 | } |
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| 215 | |
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| 216 | /** |
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| 217 | * gnome_clearenv: |
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| 218 | * |
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| 219 | * Description: Clears out the environment completely. |
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| 220 | * In case there is no native implementation of clearenv, |
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| 221 | * this could cause leaks depending on the implementation |
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| 222 | * of environment. |
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| 223 | * |
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| 224 | **/ |
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| 225 | void |
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| 226 | gnome_clearenv (void) |
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| 227 | { |
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| 228 | #ifdef HAVE_CLEARENV |
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| 229 | clearenv (); |
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| 230 | #else |
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| 231 | extern char **environ; |
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| 232 | environ[0] = NULL; |
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| 233 | #endif |
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| 234 | } |
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| 235 | |
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| 236 | |
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| 237 | /* Deprecated: */ |
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| 238 | /** |
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| 239 | * gnome_is_program_in_path: |
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| 240 | * @program: A program name. |
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| 241 | * |
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| 242 | * Deprecated, use #g_find_program_in_path |
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| 243 | * |
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| 244 | * Returns: %NULL if program is not on the path or a string |
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| 245 | * allocated with g_malloc() with the full path name of the program |
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| 246 | * found. |
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| 247 | */ |
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| 248 | |
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