Function gfxd_execute 

pub unsafe extern "C" fn gfxd_execute() -> c_int

Start executing gfxd with the current settings.

For each macro, the macro handler registered with gfxd_macro_fn is called.

Execution ends when the input ends, the macro handler returns non-zero, when an invalid macro is encountered and gfxd_stop_on_invalid is enabled, or when SPBranchList or SPEndDisplayList is encountered and gfxd_stop_on_end is enabled.

If execution ends due to an invalid macro, -1 is returned.

If execution ends because the macro handler returns non-zero, the return value from the macro handler is returned.

Otherwise zero is returned.