Avoid snprintf() of NULL when _nc_get_source() returns NULL.
The filename buffer is not actually used in this case but it is
safer to set it to the empty string than to leave it uninitialized.
OK tb@

Update ncurses and associated libraries (form, panel, menu) to
6.4-20230826 (from 5.7-20081102).

Based on result from Thomas Dickey's ncu2openbsd script and then
modified. Switches to the upstream tput. Major bump for the ncurses
libraries and for libedit and libreadline.

Help from tb, millert.

ok deraadt sthen

Instead of using our own custom BDB terminfo databases, use the ncurses
files in /usr/share/terminfo/*. This removes a large difference from
upstream ncurses and other systems.

ok millert

Update to ncurses 5.7, with local changes reapplied.

This is around eight years worth of changes (previously we were around ncurses
5.2), too many to list - many bug fixes and also a few new functions.

A major bump for libcurses, libpanel, libform and libmenu.

ok deraadt

More read/write result checking fixes to avoid unsigned comparisons vs
-1.

ok henning@ beck@ ray@

Use strlcpy() / strlcat() throughout.

use snprintf throughout

Update to ncurses-5.2-20010114

update to ncurses 5.2

update to ncurses-5.1-20001007

update to ncurses-5.0-20000311

Update to ncurses-5.0-20000304

Update to ncurses-5.0-20000108:
+ add prototype for erase() to curses.h
+ add TRACE_DATABASE flag for trace().
+ formatting changes (style)

+ corrected conversion from terminfo rs2 to termcap rs (cf: 980704)
+ make conversion to termcap ug (underline glitch) more consistently applied.
+ modify read_termtype(), fixing 'toe', which could dump core when it
found an incomplete entry such as "dumb" because it did not
initialize its buffer for _nc_read_file_entry().
+ use explicit VALID_NUMERIC() checks in a few places that had been
overlooked, and add a check to ensure that init_tabs is nonzero,
to avoid divide-by-zero (reported by Todd C Miller).

Update to ncurses-5.0-990814

ncurses-4.2-990301

make _nc_read_file_entry() look in terminfo.db too. Makes the -A and -B flags of infocmp more useful.

Move call to _nc_read_bsd_terminfo_entry() to _nc_read_entry() so reading
terminfo.db is transparent. This requires us to be able to tell which
of the entries in pathvec held the terminfo entry. To make that work
we only pass one pathname to cgetent(3) at a time. This might be a
slight performance hit but should not be noticable in normal use.

ncurses-4.2-990116

Update ncurses and associated libraries (form, panel, menu) to
6.4-20230826 (from 5.7-20081102).

Based on result from Thomas Dickey's ncu2openbsd script and then
modified. Switches to the upstream tput. Major bump for the ncurses
libraries and for libedit and libreadline.

Help from tb, millert.

ok deraadt sthen

Instead of using our own custom BDB terminfo databases, use the ncurses
files in /usr/share/terminfo/*. This removes a large difference from
upstream ncurses and other systems.

ok millert

Update to ncurses 5.7, with local changes reapplied.

This is around eight years worth of changes (previously we were around ncurses
5.2), too many to list - many bug fixes and also a few new functions.

A major bump for libcurses, libpanel, libform and libmenu.

ok deraadt

More read/write result checking fixes to avoid unsigned comparisons vs
-1.

ok henning@ beck@ ray@

Use strlcpy() / strlcat() throughout.

use snprintf throughout

Update to ncurses-5.2-20010114

update to ncurses 5.2

update to ncurses-5.1-20001007

update to ncurses-5.0-20000311

Update to ncurses-5.0-20000304

Update to ncurses-5.0-20000108:
+ add prototype for erase() to curses.h
+ add TRACE_DATABASE flag for trace().
+ formatting changes (style)

+ corrected conversion from terminfo rs2 to termcap rs (cf: 980704)
+ make conversion to termcap ug (underline glitch) more consistently applied.
+ modify read_termtype(), fixing 'toe', which could dump core when it
found an incomplete entry such as "dumb" because it did not
initialize its buffer for _nc_read_file_entry().
+ use explicit VALID_NUMERIC() checks in a few places that had been
overlooked, and add a check to ensure that init_tabs is nonzero,
to avoid divide-by-zero (reported by Todd C Miller).

Update to ncurses-5.0-990814

ncurses-4.2-990301

make _nc_read_file_entry() look in terminfo.db too. Makes the -A and -B flags of infocmp more useful.

Move call to _nc_read_bsd_terminfo_entry() to _nc_read_entry() so reading
terminfo.db is transparent. This requires us to be able to tell which
of the entries in pathvec held the terminfo entry. To make that work
we only pass one pathname to cgetent(3) at a time. This might be a
slight performance hit but should not be noticable in normal use.

ncurses-4.2-990116

Instead of using our own custom BDB terminfo databases, use the ncurses
files in /usr/share/terminfo/*. This removes a large difference from
upstream ncurses and other systems.

ok millert

Update to ncurses 5.7, with local changes reapplied.

This is around eight years worth of changes (previously we were around ncurses
5.2), too many to list - many bug fixes and also a few new functions.

A major bump for libcurses, libpanel, libform and libmenu.

ok deraadt

More read/write result checking fixes to avoid unsigned comparisons vs
-1.

ok henning@ beck@ ray@

Use strlcpy() / strlcat() throughout.

use snprintf throughout

Update to ncurses-5.2-20010114

update to ncurses 5.2

update to ncurses-5.1-20001007

update to ncurses-5.0-20000311

Update to ncurses-5.0-20000304

Update to ncurses-5.0-20000108:
+ add prototype for erase() to curses.h
+ add TRACE_DATABASE flag for trace().
+ formatting changes (style)

+ corrected conversion from terminfo rs2 to termcap rs (cf: 980704)
+ make conversion to termcap ug (underline glitch) more consistently applied.
+ modify read_termtype(), fixing 'toe', which could dump core when it
found an incomplete entry such as "dumb" because it did not
initialize its buffer for _nc_read_file_entry().
+ use explicit VALID_NUMERIC() checks in a few places that had been
overlooked, and add a check to ensure that init_tabs is nonzero,
to avoid divide-by-zero (reported by Todd C Miller).

Update to ncurses-5.0-990814

ncurses-4.2-990301

make _nc_read_file_entry() look in terminfo.db too. Makes the -A and -B flags of infocmp more useful.

Move call to _nc_read_bsd_terminfo_entry() to _nc_read_entry() so reading
terminfo.db is transparent. This requires us to be able to tell which
of the entries in pathvec held the terminfo entry. To make that work
we only pass one pathname to cgetent(3) at a time. This might be a
slight performance hit but should not be noticable in normal use.

ncurses-4.2-990116