input stream from input stream?

From: Albert Reiner (albert_at_chello.at)
Date: 01/31/04

  • Next message: Matthew Danish: "Re: Lisp's future" 
    Date: Sat, 31 Jan 2004 14:10:57 GMT

    Hi,

    I am in the first stages of getting to know CL, and I want to read large data
    files (so large that I cannot read all of it at once into memory without
    swapping) that look something like

        ...
        Xasdflksdfasdlfjasdflasdfj
        Xoiwerlxciwladlfjasdfklsdk
        ...

    Where the data I am interested in would be

        ...asdflksdfasdlfjasdflasdfjoiwerlxciwladlfjasdfklsdk...

    So it seems most natural to me to open the file as an input stream, and make a
    new input stream from that by taking care of discarding X at the beginning of
    the lines and concatenating the data. (Analogously for output to a stream.)

    I have been reading a bit on streams in the HyperSpec and CLtL2 but do not
    seem to find a way of constructing one stream from another one with additional
    processing. Is this not a sensible way of doing things, or where should I
    look?

    Thanks for any pointers,

    Albert.

    PS: I know about the RtL, and I have no idea about sports.

  • Next message: Matthew Danish: "Re: Lisp's future"

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