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From: Anthk <anthk@disroot.org>
Newsgroups: comp.lang.postscript
Subject: Re: Documentation for utf8decode and ushow (nee unicodeshow)
Date: Tue, 13 Dec 2022 20:51:12 -0000 (UTC)
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On 2022-03-06, David Newall <davidn@davidnewall.com> wrote:
> Hello All,
>
> I've almost finished my UTF-8 decode and Unicode show work.  Significant
> changes are:
>
> 1. unicodeshow is now ushow.  The names all got a bit long.
> 2. The decoder has been rewritten based on code by Thompson and Pike in
>     Plan 9.  They wrote an incredibly clever test for overlong sequences.
> 3. Documentation.  Yes, really! 
> https://davidnewall.com/software/utf8show/PostScript%20UTF8%20Extension%20Reference.pdf
>
> Have I left anything out?
>
> Regards,
>
> David

I coudn't get your examples running in GhostScript:

## code 
openbsd$ gs utf8test.ps 
GPL Ghostscript 9.56.1 (2022-04-04)
Copyright (C) 2022 Artifex Software, Inc.  All rights reserved.
This software is supplied under the GNU AGPLv3 and comes with NO WARRANTY:
see the file COPYING for details.
Error: /stackunderflow in --def--
Operand stack:
   Map
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1990   1   3   %oparray_pop   1989   1   3   %oparray_pop   1977   1   3   %oparray_pop   1833   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--
Dictionary stack:
   --dict:761/1123(ro)(G)--   --dict:0/20(G)--   --dict:75/200(L)--
Current allocation mode is local
Current file position is 561

## eof

Any tips on  using it, for instance, with an example how to 
integrate your code as a "library"?