[bug #64485] [libgroff] fontfile.cpp: null destination pointer [-Wformat-overflow=]

[G. Branden Robinson]

Update of bug #64485 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.24.0                 

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Follow-up Comment #3:


commit c64c8d4eea00b9b449e2836d3469b57a772f2e71
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Jul 29 06:02:36 2023 -0500

    [libgroff]: Fix Savannah #64485 (validation).
    
    * src/libs/libgroff/fontfile.cpp (font::open_file): Do more parameter
      validation.  Don't construct a file name for opening from components
      that are null pointers.  Also `assert()` this since it should be an
      invariant.  Migrate from `sprintf()` to `snprintf()`; we have the size
      of the destination buffer handy.  Update `#include`s.
    
    Fixes <https://savannah.gnu.org/bugs/?64485>.  Thanks to Bjarni Ingi
    Gislason for the report.




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