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   HANDLE snapshot;
 114   MODULEENTRY32 me32;
 115
 116   gpointer p;
 117
 118   if ((snapshot = CreateToolhelp32Snapshot (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
 119     return NULL;
 120
 121   me32.dwSize = sizeof (me32);
 122   p = NULL;
 123   if (Module32First (snapshot, &me32))
 124     {
 125       do {
 126         if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
 127           break;
 128       } while (Module32Next (snapshot, &me32));
 129     }
 130
 131   CloseHandle (snapshot);
 132
 133   return p;
 134 }
 135
 136 static gpointer
 137 find_in_any_module (const gchar *symbol_name)
 138 {
 139   gpointer result;
 140
 141   if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL)
 142     return NULL;
 143   else
 144     return result;
 145 }
 146
 147 static gpointer
 148 _g_module_symbol (gpointer     handle,
 149                   const gchar *symbol_name)
 150 {
 151   gpointer p;
 152
 153   if (handle == null_module_handle)
 154     {
 155       if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
 156         p = find_in_any_module (symbol_name);
 157     }
 158   else
 159     p = GetProcAddress (handle, symbol_name);
 160
 161   if (!p)
 162     set_error ("");
 163
 164   return p;
 165 }
 166
 167 static gchar*
 168 _g_module_build_path (const gchar *directory,
 169                       const gchar *module_name)
 170 {
 171   gint k;
 172
 173   k = strlen (module_name);
 174
 175   if (directory && *directory)
 176     if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 177       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, NULL);
 178 #ifdef G_WITH_CYGWIN
 179     else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 180       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 181     else
 182       return g_strconcat (directory, G_DIR_SEPARATOR_S, "cyg", module_name, ".dll", NULL);
 183 #else
 184     else if (strncmp (module_name, "lib", 3) == 0)
 185       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 186     else
 187       return g_strconcat (directory, G_DIR_SEPARATOR_S, "lib", module_name, ".dll", NULL);
 188 #endif
 189   else if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 190     return g_strdup (module_name);
 191 #ifdef G_WITH_CYGWIN
 192   else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 193     return g_strconcat (module_name, ".dll", NULL);
 194   else
 195     return g_strconcat ("cyg", module_name, ".dll", NULL);
 196 #else
 197   else if (strncmp (module_name, "lib", 3) == 0)
 198     return g_strconcat (module_name, ".dll", NULL);
 199   else
 200     return g_strconcat ("lib", module_name, ".dll", NULL);
 201 #endif
 202 }