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Re: drain-input

From: Rob Browning
Subject: Re: drain-input
Date: Wed, 29 Aug 2001 22:45:05 -0500
User-agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/20.7

Neil Jerram <address@hidden> writes:

> Here's a procedure that does what I expected `drain-input' to be.  I
> use it often in connection with `open-input-pipe':
> (define (drain-output port)
>   (let loop ((chars '())
>            (next (read-char port)))
>     (if (eof-object? next)
>       (list->string (reverse! chars))
>       (loop (cons next chars)
>             (read-char port)))))

Seems like you might get a lot better performance if you read in
chunks and then used string-concatenate(-reverse) from srfi-19 or
similar.  Actually, if read-delimited is implemented with special
casing, you might get good results with just (read-delimited "" port).

(As an aside, I thought we had a "read-bytes" call, but I don't see
 it.  Is %read-delimited! with no delimiter the only way to get N
 bytes from a port as a string?)

Rob Browning
rlb,, and
GPG=1C58 8B2C FB5E 3F64 EA5C  64AE 78FE E5FE F0CB A0AD

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