Qestion about patching

[HU Dong]

Hi!
    The porter's handbook says that "Note that if the path of a patched
file contains an underscore (_) character, the patch needs to have two
underscores instead in its name. For example, to patch a file named
src/freeglut_joystick.c, the corresponding patch should be named
patch-src-freeglut__joystick.c."

    Question: What if the file contains -
charactor(src/freeglut-joystick.c)? Should the patch be
patch-src-freeglut-joystick.c or patch-src-freeglut--joystick.c?

--
B.R.
HU Dong