Change every in/out port?

[Seong-Kook Shin]

My program is a GUI program so that input/output to the
stdin/stdout/stderr means nothing.

I want to change guile's input/output ports to the
my internal buffers (e.g. char buf[...]).

I'm sorry that I cannot completely understand Scheme's
port concept.

Is there any simple method to achieve this?

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