Problems with restore (and also dictionaries)

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#363

From: Nick Holloway
Date: Thu, 10 Sep 1992 17:26

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I have just discovered a problem with Ghostscript 2.5.  It was triggered
by the code generated by psraster.  In this it reclaims VM by performing a
'restore save' in the procedure used to decode the image data.  The actual
code is of the following form:

    [...] {restore save GetImageRow} save 6 1 roll image
    [...]
    restore

This works fine on the printers, but causes Ghostscript to complain:

    Error: /invalidrestore in --restore--
    Operand stack:
	-savetype-

The following is a small fragment that will also demonstrate the error:

    save 10 { (Hello, World!\n) print restore save } repeat restore

Another (percieved) mis-feature of Ghostscript is the way it will
automatically expand dictionaries.  This recently lead to much head
scratching, since we could preview the file, but it would not print.
Is there a way of stopping the dictionaries being expanded?

--
Nick Holloway |  `O O'  | alfie@dcs.warwick.ac.uk, alfie@warwick.UUCP,
[aka `Alfie'] | // ^ \\ | ..!uunet!mcsun!uknet!warwick!alfie

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Message-ID: <1992Sep10.172611.25400@dcs.warwick.ac.uk>

Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!dcs.warwick.ac.UK!alfie

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Newsgroups: gnu.ghostscript.bug
Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!dcs.warwick.ac.UK!alfie
From: alfie@dcs.warwick.ac.UK (Nick Holloway)
Subject: Problems with restore (and also dictionaries)
Message-ID: <1992Sep10.172611.25400@dcs.warwick.ac.uk>
Sender: gnulists@ai.mit.edu
Organization: Department of Computer Science, Warwick University, England
Distribution: gnu
Date: Thu, 10 Sep 1992 17:26:11 GMT
Approved: bug-ghostscript@prep.ai.mit.edu
Lines: 28