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From: bill@hp-pcd.UUCP
Newsgroups: net.micro.pc
Subject: Re: File truncation under PC-DOS
Message-ID: <15200010@hpcvlo.UUCP>
Date: Wed, 5-Feb-86 12:52:00 EST
Article-I.D.: hpcvlo.15200010
Posted: Wed Feb  5 12:52:00 1986
Date-Received: Tue, 11-Feb-86 03:41:14 EST
References: <901@dataioDa.UUCP>
Organization: Hewlett-Packard - Corvallis, OR
Lines: 15
Nf-ID: #R:dataioDa:-90100:hpcvlo:15200010:000:413
Nf-From: hpcvlo!bill    Feb  5 09:52:00 1986



Truncating a file to 'n' bytes is fairly easy:

[1] Open the file for read/write access using Int 21h function 3Dh.

[2] Use Int 21h function 42h to position the file pointer to position 'n'.

[3] Truncate the file at that point by using Int 21h function 40h (Write
    to File or Device) with a byte count of zero in CX.

[4] Close the file using Int 21h function 3Eh (or 4Ch).

bill frolik
hplabs!hp-pcd!bill