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 (const gchar *format,
  46            ...)
  47 {
  48   gchar *error;
  49   gchar *detail;
  50   gchar *message;
  51   va_list args;
  52
  53   error = g_win32_error_message (GetLastError ());
  54
  55   va_start (args, format);
  56   detail = g_strdup_vprintf (format, args);
  57   va_end (args);
  58
  59   message = g_strconcat (detail, error, NULL);
  60
  61   g_module_set_error (message);
  62   g_free (message);
  63   g_free (detail);
  64   g_free (error);
  65 }
  66
  67 /* --- functions --- */
  68 static gpointer
  69 _g_module_open (const gchar *file_name,
  70                 gboolean     bind_lazy,
  71                 gboolean     bind_local)
  72 {
  73   HINSTANCE handle;
  74   wchar_t *wfilename;
  75 #ifdef G_WITH_CYGWIN
  76   gchar tmp[MAX_PATH];
  77
  78   cygwin_conv_to_win32_path(file_name, tmp);
  79   file_name = tmp;
  80 #endif
  81   wfilename = g_utf8_to_utf16 (file_name, -1, NULL, NULL, NULL);
  82
  83   handle = LoadLibraryW (wfilename);
  84   g_free (wfilename);
  85
  86   if (!handle)
  87     set_error ("`%s': ", file_name);
  88
  89   return handle;
  90 }
  91
  92 static gint dummy;
  93 static gpointer null_module_handle = &dummy;
  94
  95 static gpointer
  96 _g_module_self (void)
  97 {
  98   return null_module_handle;
  99 }
 100
 101 static void
 102 _g_module_close (gpointer handle,
 103                  gboolean is_unref)
 104 {
 105   if (handle != null_module_handle)
 106     if (!FreeLibrary (handle))
 107       set_error ("");
 108 }
 109
 110 static gpointer
 111 find_in_any_module_using_toolhelp (const gchar *symbol_name)
 112 {
 113   typedef HANDLE (WINAPI *PFNCREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 114   static PFNCREATETOOLHELP32SNAPSHOT pfnCreateToolhelp32Snapshot = NULL;
 115
 116   typedef BOOL (WINAPI *PFNMODULE32FIRST)(HANDLE, MODULEENTRY32*);
 117   static PFNMODULE32FIRST pfnModule32First= NULL;
 118
 119   typedef BOOL (WINAPI *PFNMODULE32NEXT)(HANDLE, MODULEENTRY32*);
 120   static PFNMODULE32NEXT pfnModule32Next = NULL;
 121
 122   static HMODULE kernel32;
 123
 124   HANDLE snapshot;
 125   MODULEENTRY32 me32;
 126
 127   gpointer p;
 128
 129   if (!pfnCreateToolhelp32Snapshot || !pfnModule32First || !pfnModule32Next)
 130     {
 131       if (!kernel32)
 132         if (!(kernel32 = GetModuleHandle ("kernel32.dll")))
 133           return NULL;
 134
 135       if (!(pfnCreateToolhelp32Snapshot = (PFNCREATETOOLHELP32SNAPSHOT) GetProcAddress (kernel32, "CreateToolhelp32Snapshot"))
 136           || !(pfnModule32First = (PFNMODULE32FIRST) GetProcAddress (kernel32, "Module32First"))
 137           || !(pfnModule32Next = (PFNMODULE32NEXT) GetProcAddress (kernel32, "Module32Next")))
 138         return NULL;
 139     }
 140
 141   if ((snapshot = (*pfnCreateToolhelp32Snapshot) (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
 142     return NULL;
 143
 144   me32.dwSize = sizeof (me32);
 145   p = NULL;
 146   if ((*pfnModule32First) (snapshot, &me32))
 147     {
 148       do {
 149         if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
 150           break;
 151       } while ((*pfnModule32Next) (snapshot, &me32));
 152     }
 153
 154   CloseHandle (snapshot);
 155
 156   return p;
 157 }
 158
 159 static gpointer
 160 find_in_any_module_using_psapi (const gchar *symbol_name)
 161 {
 162   static HMODULE psapi = NULL;
 163
 164   typedef BOOL (WINAPI *PFNENUMPROCESSMODULES) (HANDLE, HMODULE *, DWORD, LPDWORD) ;
 165   static PFNENUMPROCESSMODULES pfnEnumProcessModules = NULL;
 166
 167   HMODULE *modules;
 168   HMODULE dummy;
 169   gint i, size;
 170   DWORD needed;
 171
 172   gpointer p;
 173
 174   if (!pfnEnumProcessModules)
 175     {
 176       if (!psapi)
 177         if ((psapi = LoadLibrary ("psapi.dll")) == NULL)
 178           return NULL;
 179
 180       if (!(pfnEnumProcessModules = (PFNENUMPROCESSMODULES) GetProcAddress (psapi, "EnumProcessModules")))
 181         return NULL;
 182     }
 183
 184   if (!(*pfnEnumProcessModules) (GetCurrentProcess (), &dummy,
 185                                  sizeof (HMODULE), &needed))
 186     return NULL;
 187
 188   size = needed + 10 * sizeof (HMODULE);
 189   modules = g_malloc (size);
 190
 191   if (!(*pfnEnumProcessModules) (GetCurrentProcess (), modules,
 192                                  size, &needed)
 193       || needed > size)
 194     {
 195       g_free (modules);
 196       return NULL;
 197     }
 198
 199   p = NULL;
 200   for (i = 0; i < needed / sizeof (HMODULE); i++)
 201     if ((p = GetProcAddress (modules[i], symbol_name)) != NULL)
 202       break;
 203
 204   g_free (modules);
 205
 206   return p;
 207 }
 208
 209 static gpointer
 210 find_in_any_module (const gchar *symbol_name)
 211 {
 212   gpointer result;
 213
 214   if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL
 215       && (result = find_in_any_module_using_psapi (symbol_name)) == NULL)
 216     return NULL;
 217   else
 218     return result;
 219 }
 220
 221 static gpointer
 222 _g_module_symbol (gpointer     handle,
 223                   const gchar *symbol_name)
 224 {
 225   gpointer p;
 226
 227   if (handle == null_module_handle)
 228     {
 229       if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
 230         p = find_in_any_module (symbol_name);
 231     }
 232   else
 233     p = GetProcAddress (handle, symbol_name);
 234
 235   if (!p)
 236     set_error ("");
 237
 238   return p;
 239 }
 240
 241 static gchar*
 242 _g_module_build_path (const gchar *directory,
 243                       const gchar *module_name)
 244 {
 245   gint k;
 246
 247   k = strlen (module_name);
 248
 249   if (directory && *directory)
 250     if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 251       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, NULL);
 252 #ifdef G_WITH_CYGWIN
 253     else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 254       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 255     else
 256       return g_strconcat (directory, G_DIR_SEPARATOR_S, "cyg", module_name, ".dll", NULL);
 257 #else
 258     else if (strncmp (module_name, "lib", 3) == 0)
 259       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 260     else
 261       return g_strconcat (directory, G_DIR_SEPARATOR_S, "lib", module_name, ".dll", NULL);
 262 #endif
 263   else if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 264     return g_strdup (module_name);
 265 #ifdef G_WITH_CYGWIN
 266   else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 267     return g_strconcat (module_name, ".dll", NULL);
 268   else
 269     return g_strconcat ("cyg", module_name, ".dll", NULL);
 270 #else
 271   else if (strncmp (module_name, "lib", 3) == 0)
 272     return g_strconcat (module_name, ".dll", NULL);
 273   else
 274     return g_strconcat ("lib", module_name, ".dll", NULL);
 275 #endif
 276 }