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Intubun
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Magic's graphics layer routes every drawing primitive through function pointers (GrXxxPtr / grXxxPtr) that are bound to a driver at startup. The original null driver assigned a single 0-arg nullDoNothing() to every pointer, which works in native builds because of K&R loose prototype rules but fails in WASM where call_indirect requires an exact type match between caller and callee. This commit: * Adds typed no-op stubs nullDoNothingI/II/IIII/IIIIIII for void-returning callbacks of various arities. * Adds nullReturnFalseI/II/III for bool-returning callbacks and nullReturnZeroI for int-returning callbacks. * Casts each pointer assignment in nullSetDisplay() to the K&R pointer type the public header still uses, while the underlying function carries the correct WASM signature. * Fills in window-management and backing-store pointers that the original null driver left at NULL — many of these are called unconditionally by WindUpdate paths, and need at least a no-op to avoid traps. * Guards the stdin watch in nullSetDisplay() with #ifndef __EMSCRIPTEN__: WASM has no real stdin file descriptor and TxAdd1InputDevice() / SigWatchFile() are POSIX-specific. Native builds are unaffected: the K&R-loose prototype machinery still accepts the previous and the new code identically.
This driver is a modification of the Stanford X10 driver. The modifications were done by Walter Scott and Eric Lunow at Lawrence Livermore National Labs.