1 /* w32reg.c - MS-Windows Registry access
2 * Copyright (C) 1999, 2002 Free Software Foundation, Inc.
4 * This file is part of GnuPG.
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
22 #if defined (__MINGW32__) || defined (__CYGWIN32__)
23 /* This module is only used in this environment */
34 get_root_key(const char *root)
39 root_key = HKEY_CURRENT_USER;
40 else if( !strcmp( root, "HKEY_CLASSES_ROOT" ) )
41 root_key = HKEY_CLASSES_ROOT;
42 else if( !strcmp( root, "HKEY_CURRENT_USER" ) )
43 root_key = HKEY_CURRENT_USER;
44 else if( !strcmp( root, "HKEY_LOCAL_MACHINE" ) )
45 root_key = HKEY_LOCAL_MACHINE;
46 else if( !strcmp( root, "HKEY_USERS" ) )
47 root_key = HKEY_USERS;
48 else if( !strcmp( root, "HKEY_PERFORMANCE_DATA" ) )
49 root_key = HKEY_PERFORMANCE_DATA;
50 else if( !strcmp( root, "HKEY_CURRENT_CONFIG" ) )
51 root_key = HKEY_CURRENT_CONFIG;
60 * Return a string from the Win32 Registry or NULL in case of
61 * error. Caller must release the return value. A NULL for root
62 * is an alias for HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE in turn.
63 * NOTE: The value is allocated with a plain malloc() - use free() and not
64 * the usual m_free()!!!
67 read_w32_registry_string( const char *root, const char *dir, const char *name )
69 HKEY root_key, key_handle;
70 DWORD n1, nbytes, type;
73 if ( !(root_key = get_root_key(root) ) )
76 if( RegOpenKeyEx( root_key, dir, 0, KEY_READ, &key_handle ) )
79 return NULL; /* no need for a RegClose, so return direct */
80 /* It seems to be common practise to fall back to HLM. */
81 if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
82 return NULL; /* still no need for a RegClose, so return direct */
86 if( RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes ) )
88 result = malloc( (n1=nbytes+1) );
91 if( RegQueryValueEx( key_handle, name, 0, &type, result, &n1 ) ) {
92 free(result); result = NULL;
95 result[nbytes] = 0; /* make sure it is really a string */
96 if (type == REG_EXPAND_SZ && strchr (result, '%')) {
103 nbytes = ExpandEnvironmentStrings (result, tmp, n1);
104 if (nbytes && nbytes > n1) {
107 tmp = malloc (n1 + 1);
110 nbytes = ExpandEnvironmentStrings (result, tmp, n1);
111 if (nbytes && nbytes > n1) {
112 free (tmp); /* oops - truncated, better don't expand at all */
119 else if (nbytes) { /* okay, reduce the length */
122 result = malloc (strlen (tmp)+1);
126 strcpy (result, tmp);
130 else { /* error - don't expand */
136 RegCloseKey( key_handle );
142 write_w32_registry_string(const char *root, const char *dir,
143 const char *name, const char *value)
145 HKEY root_key, reg_key;
147 if ( !(root_key = get_root_key(root) ) )
150 if ( RegOpenKeyEx( root_key, dir, 0, KEY_WRITE, ®_key )
154 if ( RegSetValueEx( reg_key, name, 0, REG_SZ, (BYTE *)value,
155 strlen( value ) ) != ERROR_SUCCESS ) {
156 if ( RegCreateKey( root_key, name, ®_key ) != ERROR_SUCCESS ) {
157 RegCloseKey(reg_key);
160 if ( RegSetValueEx( reg_key, name, 0, REG_SZ, (BYTE *)value,
161 strlen( value ) ) != ERROR_SUCCESS ) {
162 RegCloseKey(reg_key);
167 RegCloseKey( reg_key );
172 #endif /* __MINGW32__ || __CYGWIN32__ */