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/* w32-reg.c - MS-Windows Registry access
* Copyright (C) 1999, 2002, 2007 Free Software Foundation, Inc.
*
* This file is part of JNLIB.
*
* JNLIB is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* JNLIB is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#ifdef HAVE_W32_SYSTEM
/* This module is only used in this environment */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <windows.h>
#include "libjnlib-config.h"
#include "w32help.h"
static HKEY
get_root_key(const char *root)
{
HKEY root_key;
if (!root)
root_key = HKEY_CURRENT_USER;
else if (!strcmp( root, "HKEY_CLASSES_ROOT" ) )
root_key = HKEY_CLASSES_ROOT;
else if (!strcmp( root, "HKEY_CURRENT_USER" ) )
root_key = HKEY_CURRENT_USER;
else if (!strcmp( root, "HKEY_LOCAL_MACHINE" ) )
root_key = HKEY_LOCAL_MACHINE;
else if (!strcmp( root, "HKEY_USERS" ) )
root_key = HKEY_USERS;
else if (!strcmp( root, "HKEY_PERFORMANCE_DATA" ) )
root_key = HKEY_PERFORMANCE_DATA;
else if (!strcmp( root, "HKEY_CURRENT_CONFIG" ) )
root_key = HKEY_CURRENT_CONFIG;
else
return NULL;
return root_key;
}
/* Return a string from the Win32 Registry or NULL in case of error.
Caller must release the return value. A NULL for root is an alias
for HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE in turn. */
char *
read_w32_registry_string (const char *root, const char *dir, const char *name)
{
HKEY root_key, key_handle;
DWORD n1, nbytes, type;
char *result = NULL;
if ( !(root_key = get_root_key(root) ) )
return NULL;
if ( RegOpenKeyEx( root_key, dir, 0, KEY_READ, &key_handle ) )
{
if (root)
return NULL; /* No need for a RegClose, so return immediately. */
/* It seems to be common practise to fall back to HKLM. */
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, dir, 0, KEY_READ, &key_handle) )
return NULL; /* Still no need for a RegClose. */
}
nbytes = 1;
if (RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes ) )
goto leave;
result = jnlib_malloc ((n1=nbytes+1));
if (!result)
goto leave;
if (RegQueryValueEx( key_handle, name, 0, &type, result, &n1 ))
{
jnlib_free (result);
result = NULL;
goto leave;
}
result[nbytes] = 0; /* Make sure it is a string. */
if (type == REG_EXPAND_SZ && strchr (result, '%'))
{
char *tmp;
n1 += 1000;
tmp = jnlib_malloc (n1+1);
if (!tmp)
goto leave;
nbytes = ExpandEnvironmentStrings (result, tmp, n1);
if (nbytes && nbytes > n1)
{
jnlib_free (tmp);
n1 = nbytes;
tmp = jnlib_malloc (n1 + 1);
if (!tmp)
goto leave;
nbytes = ExpandEnvironmentStrings (result, tmp, n1);
if (nbytes && nbytes > n1)
{
/* Oops - truncated, better don't expand at all. */
jnlib_free (tmp);
goto leave;
}
tmp[nbytes] = 0;
jnlib_free (result);
result = tmp;
}
else if (nbytes)
{
/* Okay, reduce the length. */
tmp[nbytes] = 0;
jnlib_free (result);
result = jnlib_malloc (strlen (tmp)+1);
if (!result)
result = tmp;
else
{
strcpy (result, tmp);
jnlib_free (tmp);
}
}
else
{
/* Error - don't expand. */
jnlib_free (tmp);
}
}
leave:
RegCloseKey (key_handle);
return result;
}
int
write_w32_registry_string (const char *root, const char *dir,
const char *name, const char *value)
{
HKEY root_key, reg_key;
if ( !(root_key = get_root_key(root) ) )
return -1;
if ( RegOpenKeyEx( root_key, dir, 0, KEY_WRITE, ®_key )
!= ERROR_SUCCESS )
return -1;
if ( RegSetValueEx (reg_key, name, 0, REG_SZ, (BYTE *)value,
strlen( value ) ) != ERROR_SUCCESS )
{
if ( RegCreateKey( root_key, name, ®_key ) != ERROR_SUCCESS )
{
RegCloseKey(reg_key);
return -1;
}
if ( RegSetValueEx (reg_key, name, 0, REG_SZ, (BYTE *)value,
strlen( value ) ) != ERROR_SUCCESS )
{
RegCloseKey(reg_key);
return -1;
}
}
RegCloseKey (reg_key);
return 0;
}
#endif /*HAVE_W32_SYSTEM*/
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