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Thu Nov 12 10:41:39 CET 2009

String repl

For embedded applications without stdio a string repl is useful.  A
coroutine-style interface between a C node and the VM would make this
possible.

Let's use the following interface.  This will consume Scheme commands
in string form and produce a string with stdio.  The string needs to
be used before the VM is re-entered.

const char *_sc_rep(sc *sc, const char *commands);

Needed: 
  - a repl written in scheme
  - a 'c-yield-string' word that exchanges strings.
  - modifiable output ports

parameter's aren't necessary yet + IO ports only need to be settable
from scheme, so this should simply work.




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