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[bug #55299] "groff -v -e -s -t" produces garbled output on MS-Windows

From: Eli Zaretskii
Subject: [bug #55299] "groff -v -e -s -t" produces garbled output on MS-Windows
Date: Thu, 27 Dec 2018 12:15:46 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0


                 Summary: "groff -v -e -s -t" produces garbled output on
                 Project: GNU troff
            Submitted by: eliz
            Submitted on: Thu 27 Dec 2018 07:15:44 PM IST
                Category: Core
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None



Invoking "groff -v" with several preprocessor switches produces garbled output
on MS-Windows, like this:

     d:\usr>groff --version
     GNU groff version 1.22.4
     Copyright (C) 2018 Free Software Foundation, Inc.
     GNU groff comes with ABSOLUTELY NO WARRANTY.
     You may redistribute copies of groff and its subprograms
     under the terms of the GNU General Public License.
     For more information about these matters, see the file
     named COPYING.

     called subprograms:

     GNU troff (grGofNf) Uv egrrsoitotny  1(.g2r2o.f4f
     ) version 1.22.4

This happens because  all the subprograms are launched almost simultaneously,
and the text they emit is mixed into one illegible mess.  (I'm not sure the
same problem doesn't happen on Unix.)

To fix this, I propose the attached patch, which runs the subprograms
sequentially in this specific case, as there's no pipe to run anyway.  While
at that, the patch also avoids breaking the loop if one of the preprocessors
fails to run, e.g. if it is not installed; this makes the behavior more
similar to what I see on Unix.


File Attachments:

Date: Thu 27 Dec 2018 07:15:44 PM IST  Name: groff-pipe.patch  Size: 1KiB  
By: eliz



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