[Bug gdb/30420] New: [gdb/emacs] Maint info screen in emacs

[Bug gdb/30420] New: [gdb/emacs] Maint info screen in emacs

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30420

            Bug ID: 30420
           Summary: [gdb/emacs] Maint info screen in emacs
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: minor
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

I had the idea to try out "maint info screen" in the gdb mode of emacs.

Firstly, I have a terminal with:
...
$ echo $LINES
28
$ echo $COLUMNS
118
$ echo $TERM
xterm
...

After starting /usr/bin/emacs -nw, and doing M-x gdb, and executing "gdb
-i=mi", I get:
...
(gdb) maint info screen
Number of characters gdb thinks are in a line is 116.
Number of characters readline reports are in a line is 115.
Number of characters curses thinks are in a line is 118.
Number of characters environment thinks are in a line is 117 (COLUMNS).
Number of lines gdb thinks are in a page is 4294967295 (unlimited).
Number of lines readline reports are in a page is 32767 (unlimited).
Number of lines curses thinks are in a page is 25.
Number of lines environment thinks are in a page is 25 (LINES).
(gdb) shell echo $TERM
dumb
(gdb) 
...

I was a bit bewildered by the 115/116/117/118.  I'm hoping this'll make more
sense once PR30346 is fixed.

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[Bug gdb/30420] [gdb/emacs] Maint info screen in emacs

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30420

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
I got now:
...
Number of characters gdb thinks are in a line is 117.
Number of characters readline reports are in a line is 116.
Number of characters curses thinks are in a line is 118.
Number of characters environment thinks are in a line is 117 (COLUMNS).
...
which is less bad, but still doesn't make sense to me.

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