Fixes for seek/append behavior

bytecodealliance / preview2-prototyping

Polyfill adapter for preview1-using wasm modules to call preview2 functions.

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Closed pchickey closed 1 year ago

pchickey commented 1 year ago

This PR fixes two bugs around seek & append behavior:

the adapter needs to validate to make sure a seek is to a non-negative offset. Fixes file_seek-tell test.
the adapter needs to set or clear the append flag in fd_fdstat_set_flags. Fixes the fd_flags_set test.

Plus a little bit of code motion, and commenting the fd_flags_set test better.