[Bug 1772872] [NEW] Provide screen.xterm-256color and rxvt-unicode-256color terminfo entries in ncurses-base

[Matthias Klose]

Public bug reported:

The gnome standard terminal emulator (gnome-terminal) sets TERM=xterm-
256color, and screen sets it to screen.xterm-256color, resulting in an
usuable TERM setting, because the terminfo settings are not available by
default. This patch includes the screen.xterm-256color and rxvt-unicode-
256color settings in ncurses-base, resulting in working screen settings
out-of-the-box.

Regression potential: The size of ncurses-base is increased by 3500
bytes (unpacked).  The debian-installer packages might need adjustment
for the additional size.

Acceptance criteria: The package builds, and provides the new terminfo
entries in ncurses-base (note that no Breaks/Replaces are needed,
because these are installed in a different path).

Also backport the fix for security issue CVE-2018-10754, fixing a
segfault, adding a null-pointer check in _nc_parse_entry to handle an
error when a use-name is invalid syntax.

** Affects: ncurses (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1772872

Title:
  Provide screen.xterm-256color and rxvt-unicode-256color terminfo
  entries in ncurses-base

Status in ncurses package in Ubuntu:
  New

Bug description:
  The gnome standard terminal emulator (gnome-terminal) sets TERM=xterm-
  256color, and screen sets it to screen.xterm-256color, resulting in an
  usuable TERM setting, because the terminfo settings are not available
  by default. This patch includes the screen.xterm-256color and rxvt-
  unicode-256color settings in ncurses-base, resulting in working screen
  settings out-of-the-box.

  Regression potential: The size of ncurses-base is increased by 3500
  bytes (unpacked).  The debian-installer packages might need adjustment
  for the additional size.

  Acceptance criteria: The package builds, and provides the new terminfo
  entries in ncurses-base (note that no Breaks/Replaces are needed,
  because these are installed in a different path).

  Also backport the fix for security issue CVE-2018-10754, fixing a
  segfault, adding a null-pointer check in _nc_parse_entry to handle an
  error when a use-name is invalid syntax.

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