src/w32reg.c

   1 /* Emulate the X Resource Manager through the registry.
   2    Copyright (C) 1990, 1993, 1994, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008, 2009, 2010, 2011  Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Written by Kevin Gallo */
  21
  22 #include <config.h>
  23 #include <setjmp.h>
  24 #include "lisp.h"
  25 #include "w32term.h"
  26 #include "blockinput.h"
  27
  28 #include <stdio.h>
  29
  30 #define REG_ROOT "SOFTWARE\\GNU\\Emacs"
  31
  32 /* Default system colors from the Display Control Panel settings.  */
  33 #define SYSTEM_DEFAULT_RESOURCES                          \
  34   "emacs.foreground:SystemWindowText\0"                   \
  35   "emacs.background:SystemWindow\0"                       \
  36   "emacs.tooltip.attributeForeground:SystemInfoText\0"    \
  37   "emacs.tooltip.attributeBackground:SystemInfoWindow\0"  \
  38   "emacs.tool-bar.attributeForeground:SystemButtonText\0" \
  39   "emacs.tool-bar.attributeBackground:SystemButtonFace\0" \
  40   "emacs.menu.attributeForeground:SystemMenuText\0"       \
  41   "emacs.menu.attributeBackground:SystemMenu\0"           \
  42   "emacs.scroll-bar.attributeForeground:SystemScrollbar\0"
  43
  44 /* Other possibilities for default faces:
  45
  46   region: Could use SystemHilight, but interferes with our ability to
  47   see most syntax highlighting through the region face.
  48
  49   modeline: Could use System(In)ActiveTitle, gradient versions (not
  50   supported on 95 and NT), but modeline is more like a status bar
  51   really (which don't appear to be configurable in Windows).
  52
  53   highlight: Could use SystemHotTrackingColor, but it is not supported
  54   on Windows 95 or NT, and other apps only seem to use it for menus
  55   anyway.
  56
  57 */
  58
  59 static char *
  60 w32_get_rdb_resource (char *rdb, char *resource)
  61 {
  62   char *value = rdb;
  63   int len = strlen (resource);
  64
  65   while (*value)
  66     {
  67       /* Comparison is case-insensitive because registry searches are too.  */
  68       if ((strnicmp (value, resource, len) == 0) && (value[len] == ':'))
  69         return xstrdup (&value[len + 1]);
  70
  71       value = strchr (value, '\0') + 1;
  72     }
  73
  74   return NULL;
  75 }
  76
  77 static LPBYTE
  78 w32_get_string_resource (char *name, char *class, DWORD dwexptype)
  79 {
  80   LPBYTE lpvalue = NULL;
  81   HKEY hrootkey = NULL;
  82   DWORD dwType;
  83   DWORD cbData;
  84   BOOL ok = FALSE;
  85   HKEY hive = HKEY_CURRENT_USER;
  86
  87  trykey:
  88
  89   BLOCK_INPUT;
  90
  91   /* Check both the current user and the local machine to see if we have
  92      any resources */
  93
  94   if (RegOpenKeyEx (hive, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS)
  95     {
  96       char *keyname;
  97
  98       if (RegQueryValueEx (hrootkey, name, NULL, &dwType, NULL, &cbData) == ERROR_SUCCESS
  99           && dwType == dwexptype)
 100         {
 101           keyname = name;
 102         }
 103       else if (RegQueryValueEx (hrootkey, class, NULL, &dwType, NULL, &cbData) == ERROR_SUCCESS
 104                && dwType == dwexptype)
 105         {
 106           keyname = class;
 107         }
 108       else
 109         {
 110           keyname = NULL;
 111         }
 112
 113       ok = (keyname
 114             && (lpvalue = (LPBYTE) xmalloc (cbData)) != NULL
 115             && RegQueryValueEx (hrootkey, keyname, NULL, NULL, lpvalue, &cbData) == ERROR_SUCCESS);
 116
 117       RegCloseKey (hrootkey);
 118     }
 119
 120   UNBLOCK_INPUT;
 121
 122   if (!ok)
 123     {
 124       if (lpvalue)
 125         {
 126           xfree (lpvalue);
 127           lpvalue = NULL;
 128         }
 129       if (hive == HKEY_CURRENT_USER)
 130         {
 131           hive = HKEY_LOCAL_MACHINE;
 132           goto trykey;
 133         }
 134
 135       /* Check if there are Windows specific defaults defined.  */
 136       return w32_get_rdb_resource (SYSTEM_DEFAULT_RESOURCES, name);
 137     }
 138   return (lpvalue);
 139 }
 140
 141 /* Retrieve the string resource specified by NAME with CLASS from
 142    database RDB. */
 143
 144 char *
 145 x_get_string_resource (XrmDatabase rdb, char *name, char *class)
 146 {
 147   if (rdb)
 148     {
 149       char *resource;
 150
 151       if (resource = w32_get_rdb_resource (rdb, name))
 152         return resource;
 153       if (resource = w32_get_rdb_resource (rdb, class))
 154         return resource;
 155     }
 156
 157   if (inhibit_x_resources)
 158     /* --quick was passed, so this is a no-op.  */
 159     return NULL;
 160
 161   return (w32_get_string_resource (name, class, REG_SZ));
 162 }
 163