Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!kuhub.cc.ukans.edu!markv
From: markv@kuhub.cc.ukans.edu
Newsgroups: comp.sys.amiga.tech
Subject: Re: Wanted: Filelength() function
Message-ID: <25061.26b594ea@kuhub.cc.ukans.edu>
Date: 31 Jul 90 19:25:46 GMT
References: <2671@mindlink.UUCP>
Organization: University of Kansas Academic Computing Services
Lines: 42

> I don't think there's a function that returns the filelength of a file, with
> AmigaDOS.But I need an equivalent...how do you determine the length of a file
> given onlythe file handle (eg from an Open)?  There must be a way to find the
> associated file lock, as one is created when the file is opened (shared /
> exclusive)...right? Then you can Examine the FileInfoBlock and get the file's
> length from the fibSize field.
> 
>     ie    size_t  filelength(int handle)
> 
>Iwant a function that doesn't require knowing the filename...or do I need 2.0?
> 
> Thanks.

If you use C stream handles (not Amiga ones) just try the following function:

#include <stdio.h>

size_t filelength(FILE *FooFile)
{
    pos_t	save_pos;
    size_t	temp;

    /*
    ** fseek() and ftell() do all the work.  fgetpos() and fsetpos() insure
    ** that we leave the file the way we got it.
    */

    save_pos = fgetpos(FooFile);
    fseek(FooFile, 0, SEEK_END);
    temp = ftell(FooFile);
    fsetpos(FooFile, save_pos);
    return(temp);
}
-- 
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Mark Gooderum			Only...		\    Good Cheer !!!
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