util/w32reg.c

   1 /* w32reg.c -  MS-Windows Registry access
   2  *      Copyright (C) 1999 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   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.
  10  *
  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.
  15  *
  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
  19  */
  20
  21 #include <config.h>
  22 #ifdef __MINGW32__  /* This module is only used in this environment */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <stdarg.h>
  28 #include <windows.h>
  29 #include "util.h"
  30 #include "memory.h"
  31
  32
  33 /****************
  34  * Return a string from the Win32 Registry or NULL in case of
  35  * error.  Caller must release the return value.   A NUKK for root
  36  * is an alias fro HKEY_CURRENT_USER
  37  * NOTE: The value is allocated with a plain malloc() - use free() and not
  38  * the usual gcry_free()!!!
  39  */
  40 char *
  41 read_w32_registry_string( const char *root, const char *dir, const char *name )
  42 {
  43     HKEY root_key, key_handle;
  44     DWORD n1, nbytes;
  45     char *result = NULL;
  46
  47     if( !root )
  48         root_key = HKEY_CURRENT_USER;
  49     else if( !strcmp( root, "HKEY_CLASSES_ROOT" ) )
  50         root_key = HKEY_CLASSES_ROOT;
  51     else if( !strcmp( root, "HKEY_CURRENT_USER" ) )
  52         root_key = HKEY_CURRENT_USER;
  53     else if( !strcmp( root, "HKEY_LOCAL_MACHINE" ) )
  54         root_key = HKEY_LOCAL_MACHINE;
  55     else if( !strcmp( root, "HKEY_USERS" ) )
  56         root_key = HKEY_USERS;
  57     else if( !strcmp( root, "HKEY_PERFORMANCE_DATA" ) )
  58         root_key = HKEY_PERFORMANCE_DATA;
  59     else if( !strcmp( root, "HKEY_CURRENT_CONFIG" ) )
  60         root_key = HKEY_CURRENT_CONFIG;
  61     else
  62         return NULL;
  63
  64     if( RegOpenKeyEx( root_key, dir, 0, KEY_READ, &key_handle ) )
  65         return NULL; /* no need for a RegClose, so return direct */
  66
  67     nbytes = 1;
  68     if( RegQueryValueEx( key_handle, name, 0, NULL, NULL, &nbytes ) )
  69         goto leave;
  70     result = malloc( (n1=nbytes+1) );
  71     if( !result )
  72         goto leave;
  73     if( RegQueryValueEx( key_handle, name, 0, NULL, result, &n1 ) ) {
  74         free(result); result = NULL;
  75         goto leave;
  76     }
  77     result[nbytes] = 0; /* make sure it is really a string  */
  78
  79   leave:
  80     RegCloseKey( key_handle );
  81     return result;
  82 }
  83
  84
  85
  86
  87
  88 #endif /* __MINGW32__ */