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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /*
  22  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  23  * file for a list of people on the GLib Team.  See the ChangeLog
  24  * files for a list of changes.  These files are distributed with
  25  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  26  */
  27
  28 /*
  29  * MT safe
  30  */
  31 #include "config.h"
  32
  33 #include <stdio.h>
  34 #include <windows.h>
  35
  36 #include <tlhelp32.h>
  37
  38 #ifdef G_WITH_CYGWIN
  39 #include <sys/cygwin.h>
  40 #endif
  41
  42 static void
  43 set_error (const gchar *format,
  44            ...)
  45 {
  46   gchar *error;
  47   gchar *detail;
  48   gchar *message;
  49   va_list args;
  50
  51   error = g_win32_error_message (GetLastError ());
  52
  53   va_start (args, format);
  54   detail = g_strdup_vprintf (format, args);
  55   va_end (args);
  56
  57   message = g_strconcat (detail, error, NULL);
  58
  59   g_module_set_error (message);
  60   g_free (message);
  61   g_free (detail);
  62   g_free (error);
  63 }
  64
  65 /* --- functions --- */
  66 static gpointer
  67 _g_module_open (const gchar *file_name,
  68                 gboolean     bind_lazy,
  69                 gboolean     bind_local)
  70 {
  71   HINSTANCE handle;
  72   wchar_t *wfilename;
  73 #ifdef G_WITH_CYGWIN
  74   gchar tmp[MAX_PATH];
  75
  76   cygwin_conv_to_win32_path(file_name, tmp);
  77   file_name = tmp;
  78 #endif
  79   wfilename = g_utf8_to_utf16 (file_name, -1, NULL, NULL, NULL);
  80
  81   handle = LoadLibraryW (wfilename);
  82   g_free (wfilename);
  83
  84   if (!handle)
  85     set_error ("'%s': ", file_name);
  86
  87   return handle;
  88 }
  89
  90 static gint dummy;
  91 static gpointer null_module_handle = &dummy;
  92
  93 static gpointer
  94 _g_module_self (void)
  95 {
  96   return null_module_handle;
  97 }
  98
  99 static void
 100 _g_module_close (gpointer handle,
 101                  gboolean is_unref)
 102 {
 103   if (handle != null_module_handle)
 104     if (!FreeLibrary (handle))
 105       set_error ("");
 106 }
 107
 108 static gpointer
 109 find_in_any_module_using_toolhelp (const gchar *symbol_name)
 110 {
 111   HANDLE snapshot;
 112   MODULEENTRY32 me32;
 113
 114   gpointer p;
 115
 116   if ((snapshot = CreateToolhelp32Snapshot (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
 117     return NULL;
 118
 119   me32.dwSize = sizeof (me32);
 120   p = NULL;
 121   if (Module32First (snapshot, &me32))
 122     {
 123       do {
 124         if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
 125           break;
 126       } while (Module32Next (snapshot, &me32));
 127     }
 128
 129   CloseHandle (snapshot);
 130
 131   return p;
 132 }
 133
 134 static gpointer
 135 find_in_any_module (const gchar *symbol_name)
 136 {
 137   gpointer result;
 138
 139   if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL)
 140     return NULL;
 141   else
 142     return result;
 143 }
 144
 145 static gpointer
 146 _g_module_symbol (gpointer     handle,
 147                   const gchar *symbol_name)
 148 {
 149   gpointer p;
 150
 151   if (handle == null_module_handle)
 152     {
 153       if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
 154         p = find_in_any_module (symbol_name);
 155     }
 156   else
 157     p = GetProcAddress (handle, symbol_name);
 158
 159   if (!p)
 160     set_error ("");
 161
 162   return p;
 163 }
 164
 165 static gchar*
 166 _g_module_build_path (const gchar *directory,
 167                       const gchar *module_name)
 168 {
 169   gint k;
 170
 171   k = strlen (module_name);
 172
 173   if (directory && *directory)
 174     if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 175       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, NULL);
 176 #ifdef G_WITH_CYGWIN
 177     else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 178       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 179     else
 180       return g_strconcat (directory, G_DIR_SEPARATOR_S, "cyg", module_name, ".dll", NULL);
 181 #else
 182     else if (strncmp (module_name, "lib", 3) == 0)
 183       return g_strconcat (directory, G_DIR_SEPARATOR_S, module_name, ".dll", NULL);
 184     else
 185       return g_strconcat (directory, G_DIR_SEPARATOR_S, "lib", module_name, ".dll", NULL);
 186 #endif
 187   else if (k > 4 && g_ascii_strcasecmp (module_name + k - 4, ".dll") == 0)
 188     return g_strdup (module_name);
 189 #ifdef G_WITH_CYGWIN
 190   else if (strncmp (module_name, "lib", 3) == 0 || strncmp (module_name, "cyg", 3) == 0)
 191     return g_strconcat (module_name, ".dll", NULL);
 192   else
 193     return g_strconcat ("cyg", module_name, ".dll", NULL);
 194 #else
 195   else if (strncmp (module_name, "lib", 3) == 0)
 196     return g_strconcat (module_name, ".dll", NULL);
 197   else
 198     return g_strconcat ("lib", module_name, ".dll", NULL);
 199 #endif
 200 }