Provide a method to use unicode command line arguments on Windows

For unicode command line characters Windows uses UTF-16, while Glib
and GTK use UTF-8. To solve that we retrieve the command line
via __wgetmainargs() and use g_utf16_to_utf8() to convert each argument.

The used method should support wildcards passed as arguments
(e.g. *.xml).

Two new, OS abstracted functions appear in linux.c (NOP), macos.c (NOP),
windows.c:

subsurface_command_line_init(...)
subsurface_command_line_exit(...)

which are being called in main()

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/macos.c b/macos.c
index d0d7a742b..17ae4a411 100644
--- a/macos.c
+++ b/macos.c
@@ -149,3 +149,13 @@ void subsurface_ui_setup(GtkSettings *settings, GtkWidget *menubar,
 
 	gtk_osxapplication_ready(osx_app);
 }
+
+void subsurface_command_line_init(gint *argc, gchar ***argv)
+{
+	/* this is a no-op */
+}
+
+void subsurface_command_line_exit(gint *argc, gchar ***argv)
+{
+	/* this is a no-op */
+}