gmodule/gmodule-win32.c

   1 /* GMODULE - GLIB wrapper code for dynamic module loading
   2  * Copyright (C) 1998, 2000 Tim Janik
   3  *
   4  * Win32 GMODULE implementation
   5  * Copyright (C) 1998 Tor Lillqvist
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library 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 GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 /*
  24  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  25  * file for a list of people on the GLib Team.  See the ChangeLog
  26  * files for a list of changes.  These files are distributed with
  27  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  28  */
  29
  30 /*
  31  * MT safe
  32  */
  33 #include "config.h"
  34
  35 #include <stdio.h>
  36 #include <windows.h>
  37
  38 #include <tlhelp32.h>
  39
  40 #ifdef G_WITH_CYGWIN
  41 #include <sys/cygwin.h>
  42 #endif
  43
  44 static void
  45 set_error (void)
  46 {
  47   gchar *error = g_win32_error_message (GetLastError ());
  48
  49   g_module_set_error (error);
  50   g_free (error);
  51 }
  52
  53 /* --- functions --- */
  54 static gpointer
  55 _g_module_open (const gchar *file_name,
  56                 gboolean     bind_lazy,
  57                 gboolean     bind_local)
  58 {
  59   HINSTANCE handle;
  60   wchar_t *wfilename;
  61 #ifdef G_WITH_CYGWIN
  62   gchar tmp[MAX_PATH];
  63
  64   cygwin_conv_to_win32_path(file_name, tmp);
  65   file_name = tmp;
  66 #endif
  67   wfilename = g_utf8_to_utf16 (file_name, -1, NULL, NULL, NULL);
  68
  69   handle = LoadLibraryW (wfilename);
  70   g_free (wfilename);
  71
  72   if (!handle)
  73     set_error ();
  74
  75   return handle;
  76 }
  77
  78 static gint dummy;
  79 static gpointer null_module_handle = &dummy;
  80
  81 static gpointer
  82 _g_module_self (void)
  83 {
  84   return null_module_handle;
  85 }
  86
  87 static void
  88 _g_module_close (gpointer handle,
  89                  gboolean is_unref)
  90 {
  91   if (handle != null_module_handle)
  92     if (!FreeLibrary (handle))
  93       set_error ();
  94 }
  95
  96 static gpointer
  97 find_in_any_module_using_toolhelp (const gchar *symbol_name)
  98 {
  99   typedef HANDLE (WINAPI *PFNCREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 100   static PFNCREATETOOLHELP32SNAPSHOT pfnCreateToolhelp32Snapshot = NULL;
 101
 102   typedef BOOL (WINAPI *PFNMODULE32FIRST)(HANDLE, MODULEENTRY32*);
 103   static PFNMODULE32FIRST pfnModule32First= NULL;
 104
 105   typedef BOOL (WINAPI *PFNMODULE32NEXT)(HANDLE, MODULEENTRY32*);
 106   static PFNMODULE32NEXT pfnModule32Next = NULL;
 107
 108   static HMODULE kernel32;
 109
 110   HANDLE snapshot;
 111   MODULEENTRY32 me32;
 112
 113   gpointer p;
 114
 115   if (!pfnCreateToolhelp32Snapshot || !pfnModule32First || !pfnModule32Next)
 116     {
 117       if (!kernel32)
 118         if (!(kernel32 = GetModuleHandle ("kernel32.dll")))
 119           return NULL;
 120
 121       if (!(pfnCreateToolhelp32Snapshot = (PFNCREATETOOLHELP32SNAPSHOT) GetProcAddress (kernel32, "CreateToolhelp32Snapshot"))
 122           || !(pfnModule32First = (PFNMODULE32FIRST) GetProcAddress (kernel32, "Module32First"))
 123           || !(pfnModule32Next = (PFNMODULE32NEXT) GetProcAddress (kernel32, "Module32Next")))
 124         return NULL;
 125     }
 126
 127   if ((snapshot = (*pfnCreateToolhelp32Snapshot) (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
 128     return NULL;
 129
 130   me32.dwSize = sizeof (me32);
 131   p = NULL;
 132   if ((*pfnModule32First) (snapshot, &me32))
 133     {
 134       do {
 135         if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
 136           break;
 137       } while ((*pfnModule32Next) (snapshot, &me32));
 138     }
 139
 140   CloseHandle (snapshot);
 141
 142   return p;
 143 }
 144
 145 static gpointer
 146 find_in_any_module_using_psapi (const gchar *symbol_name)
 147 {
 148   static HMODULE psapi = NULL;
 149
 150   typedef BOOL (WINAPI *PFNENUMPROCESSMODULES) (HANDLE, HMODULE *, DWORD, LPDWORD) ;
 151   static PFNENUMPROCESSMODULES pfnEnumProcessModules = NULL;
 152
 153   HMODULE *modules;
 154   HMODULE dummy;
 155   gint i, size;
 156   DWORD needed;
 157
 158   gpointer p;
 159
 160   if (!pfnEnumProcessModules)
 161     {
 162       if (!psapi)
 163         if ((psapi = LoadLibrary ("psapi.dll")) == NULL)
 164           return NULL;
 165
 166       if (!(pfnEnumProcessModules = (PFNENUMPROCESSMODULES) GetProcAddress (psapi, "EnumProcessModules")))
 167         return NULL;
 168     }
 169
 170   if (!(*pfnEnumProcessModules) (GetCurrentProcess (), &dummy,
 171                                  sizeof (HMODULE), &needed))
 172     return NULL;
 173
 174   size = needed + 10 * sizeof (HMODULE);
 175   modules = g_malloc (size);
 176
 177   if (!(*pfnEnumProcessModules) (GetCurrentProcess (), modules,
 178                                  size, &needed)
 179       || needed > size)
 180     {
 181       g_free (modules);
 182       return NULL;
 183     }
 184
 185   p = NULL;
 186   for (i = 0; i < needed / sizeof (HMODULE); i++)
 187     if ((p = GetProcAddress (modules[i], symbol_name)) != NULL)
 188       break;
 189
 190   g_free (modules);
 191
 192   return p;
 193 }
 194
 195 static gpointer
 196 find_in_any_module (const gchar *symbol_name)
 197 {
 198   gpointer result;
 199
 200   if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL
 201       && (result = find_in_any_module_using_psapi (symbol_name)) == NULL)
 202     return NULL;
 203   else
 204     return result;
 205 }
 206
 207 static gpointer
 208 _g_module_symbol (gpointer     handle,
 209                   const gchar *symbol_name)
 210 {
 211   gpointer p;
 212
 213   if (handle == null_module_handle)
 214     {
 215       if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
 216         p = find_in_any_module (symbol_name);
 217     }
 218   else
 219     p = GetProcAddress (handle, symbol_name);
 220
 221   if (!p)
 222     set_error ();
 223
 224   return p;
 225 }
 226
 227 static gchar*
 228 _g_module_build_path (const gchar *directory,
 229                       const gchar *module_name)
 230 {
 231   gint k;
 232
 233   k = strlen (module_name);
 234
 235   if (directory && *directory)
 236     if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 237       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, NULL);
 238 #ifdef G_WITH_CYGWIN
 239     else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 240       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 241     else
 242       return g_strconcat (directory, G_DIR_SEPARATOR_S, "cyg", module_name, ".dll", NULL);
 243 #else
 244     else if (strncmp (module_name, "lib", 3) == 0)
 245       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 246     else
 247       return g_strconcat (directory, G_DIR_SEPARATOR_S, "lib", module_name, ".dll", NULL);
 248 #endif
 249   else if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 250     return g_strdup (module_name);
 251 #ifdef G_WITH_CYGWIN
 252   else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 253     return g_strconcat (module_name, ".dll", NULL);
 254   else
 255     return g_strconcat ("cyg", module_name, ".dll", NULL);
 256 #else
 257   else if (strncmp (module_name, "lib", 3) == 0)
 258     return g_strconcat (module_name, ".dll", NULL);
 259   else
 260     return g_strconcat ("lib", module_name, ".dll", NULL);
 261 #endif
 262 }