[screen-devel] [bug #53313] odd backslash escape parsing of the echo command

[Soliton]

URL:
  <http://savannah.gnu.org/bugs/?53313>

                 Summary: odd backslash escape parsing of the echo command
                 Project: GNU Screen
            Submitted by: soliton
            Submitted on: Fri 09 Mar 2018 10:51:27 PM UTC
                Category: Program Logic
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.5.0
           Fixed Release: None
         Planned Release: None
           Work Required: None

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Details:

screen -X echo '\' produces an error instead of printing \.

: Missing " quote.


According to amade it's the same with the newest version.

One could argue that a single unescaped backslash is not valid but then I
think at least the error message should be improved.

I suggest to do it similar to printf though which just prints the \ in this
case.

It seems to me that the backslash escape and quote handling could be improved
in general.

screen -X echo '\"\"\r\n\t' does not seem to do much useful. Perhaps it'd be
better to not interprete backslash escapes or quotes at all.




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