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, 2 insertions, 0 deletions

diff --git a/dive.h b/dive.h
index d05f1d1b4..2c224a12d 100644
--- a/dive.h
+++ b/dive.h
@@ -434,6 +434,8 @@ extern const char *star_strings[];
 extern const char *default_filename;
 extern const char *existing_filename;
 extern const char *subsurface_default_filename(void);
+extern void subsurface_command_line_init(gint *, gchar ***);
+extern void subsurface_command_line_exit(gint *, gchar ***);
 #define AIR_PERMILLE 209
 
 #define FRACTION(n,x) ((unsigned)(n)/(x)),((unsigned)(n)%(x))