[bug #62813] [troff] invalid input can corrupt subsequent diagnostic message

[G. Branden Robinson]

Update of bug #62813 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #2:


commit 812604ac60537acdbe714270eaaafb21170fe10c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Mon Jul 25 15:28:24 2022 -0500

    src/roff/troff/input.cpp: Fix Savannah #62813.
    
    * src/roff/troff/input.cpp (input_char_description): Clear static buffer
      on every entry to the function so that calling it twice in succession
      where the second call populates the buffer with less data doesn't
      return leftover garbage characters.  Problem appears to date back to
      1991 or earlier.
    
    Fixes <https://savannah.gnu.org/bugs/?62813>.



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