[ clisp-Feature Requests-2565152 ] add (setf file-position) function

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Feature Requests item #2565152, was opened at 2009-02-04 20:00
Message generated for change (Comment added) made by sf-robot
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Category: Extend ANSI CL
Group: None
>Status: Closed
Resolution: Rejected
Priority: 5
Private: No
Submitted By: Drutsa Pavel (rawlik)
Assigned to: Sam Steingold (sds)
Summary: add (setf file-position) function

Initial Comment:
On parsing large binary file it's very inconvenient to load it completely in the memory for access complex structures.

For example:
In  "Microsoft Compound File" internal FAT can be at any part of the file and sectors can be in any order like in FAT16(32) file system. 
And if I want to load only the structure tree without data stream Then I  want to get data from stream I must open and load it again.

This extension can be realized in any modern operating system and seems to be equivalent to (setf stream-element-type) - that is not realized in SBCL for example :-).
Yes the code using this will be unportable but it's Very Very  convenient and intuitive.

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>Comment By: SourceForge Robot (sf-robot)
Date: 2009-03-18 18:53

Message:
This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).

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Comment By: Sam Steingold (sds)
Date: 2009-02-04 22:22

Message:
how is this supposed to be different from file-position with a second
argument?
http://www.lispworks.com/documentation/HyperSpec/Body/f_file_p.htm
(defsetf  file-position file-position) is all you need.

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