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Clean up primitives for converting from/to hex chars.
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In the process of building slice primitives I found an out-of-bounds access
in write-byte.
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We only can't use rm32=5 when mod=0. Totally fine when it's mod=1.
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I'm imagining 3 core stages total:
1. convert text hex bytes -> binary (✓)
2. pack and reorder operands
3. compute label addresses
(Not including extras like error-checking.)
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Bugfix in scenarios where scan-next-byte needs to abort.
I'm starting to have trouble keeping strings, streams and buffered-files
straight.
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Clean up a few things:
a) Call scan-next-byte in hex.subx with the right number of args. Turns
out tests continue to work fine if they never use the other args.
b) Tear down a test for 'stop' in the right order. Not important since we
have no EBP to restore. But can still be misleading.
c) Have 'check-ints-equal' return nothing. Handy for it to not mess up
EAX. I never use the result anyway, and the name also is imperative suggesting
callers won't expect a return value.
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Making progress on hex1 (http://web.archive.org/web/20061108010907/http://www.rano.org/bcompiler.html)
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