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stdio: fix broken ReadC logic
Looping inside ReadC broke the shell's hook logic. We have to return immediately when nothing is typed.
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@ -112,11 +112,14 @@ printHexPair:
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;
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; This routine also takes care of echoing received characters back to the TTY.
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;
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; This routine doesn't wait after a typed char. If nothing is typed, we return
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; immediately with Z flag unset.
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;
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; Note that this routine doesn't bother returning the typed character.
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stdioReadC:
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; Let's wait until something is typed.
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call stdioGetC
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jr nz, stdioReadC ; nothing typed? loop
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ret nz ; nothing typed? nothing to do
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; got it. Now, is it a CR or LF?
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cp ASCII_CR
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jr z, .complete ; char is CR? buffer complete!
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