Determine if the PhysicsFS library is initialized.
Defined in <physfs.h>
int PHYSFS_isInit(void);(int) Returns non-zero if library is initialized, zero if library is not.
Once PHYSFS_init() returns successfully, this will return non-zero. Before a successful PHYSFS_init() and after PHYSFS_deinit() returns successfully, this will return zero. This function is safe to call at any time.
It is safe to call this function from any thread.
This function is available since PhysicsFS 2.0.0.