Style fixes most for __CTRACE().

Expand __CTRACE() to __nothing #ifndef DEBUG.

Remove most of #ifdef DEBUG around __CTRACE() calls.

No binary changes, except for line numbers for assert().

Add missing newline to debug trace message

ok blymn@

Ignore terminfo padding specifications when checking whether
exit_attribute_mode contains exit_alt_charset_mode.

Fixes PR lib/53653.

curses: fix ripoffline

When creating stdscr, ensure it's placed and sized in accordance with
lines ripped off.
LINES is no longer adjusted for lines ripped off.
POSIX makes no mention that it should

curses: fix ripoffline

When creating stdscr, ensure it's placed and sized in accordance with
lines ripped off.
LINES is no longer adjusted for lines ripped off.
POSIX makes no mention that it should be adjusted.
Bottom lines are now placed correctly.
Lines ripped off are now displayed after calling initscr.

ok kamil@

Fixes PR #53635

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POSIX says that use_env(3) must precede setupterm(3).
The former lives in curses.h, but the latter lives in term.h.

This is solved by moving the function to libterminfo.
Because the environment can

POSIX says that use_env(3) must precede setupterm(3).
The former lives in curses.h, but the latter lives in term.h.

This is solved by moving the function to libterminfo.
Because the environment can affect the terminal capabilities for
lines and columns, it follows that the tty size should affect it to.
So move that code to libterminfo and adjust in libcurses.

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Make this compile again (gcc does not like strcmp(maybe-NULL, maybe-NULL);
simplify the life of the {compiler,human eyes}.

Move ESCDELAY to curses.c so all globals are close to each other.
Remove _reentrant and use ESCDELAY and TABSIZE as we're not really
reentrant.

Check _cursesi_term is set in a few places and sprinkle some static.

If either set_escdelay(3) or set_tabsize(3) are called, set _reentrant
to ensure we use the saved value for the sceen.

This effectively makes ESCDELAY and TABSIZE read-only when either
of these func

If either set_escdelay(3) or set_tabsize(3) are called, set _reentrant
to ensure we use the saved value for the sceen.

This effectively makes ESCDELAY and TABSIZE read-only when either
of these functions are called.

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Move the ripoffline logic out of screen.c and into ripoffline.c.
Store ripped off lines in the SCREEN structure so we can repaint then
when the terminal is resized.
Fix mvwin(3) so it can move window

Move the ripoffline logic out of screen.c and into ripoffline.c.
Store ripped off lines in the SCREEN structure so we can repaint then
when the terminal is resized.
Fix mvwin(3) so it can move windows in the ripped off area.

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Implement POSIX curses function ripoffline(3).

KNF.
Normalise coding style.
White space police.
Sprinkle some extra braces to make the flow more clear.

No functional changes.

Whitespace

Add the set_escdelay(3) and set_tabsize(3) ncurses extensions.

Implement POSIX curses use_env function.

Add the POSIX filter() function to libcurses.

Remove extra new line in debugging output.

PR/50092: don't leak screen on multiple setterms.

Add TABSIZE, which is derived from terminfo init_tabs.
Use this when processing \t.
If TABSIZE is set in the environment, this takes precedence.

Fix a NULL dereference if the exit_alt_charset_mode capability is not defined.

The previous version of this file changed a terminal initialisation test on
the exit_attribute_mode capability, checkin

Fix a NULL dereference if the exit_alt_charset_mode capability is not defined.

The previous version of this file changed a terminal initialisation test on
the exit_attribute_mode capability, checking for the exit_alt_charset_mode
capability as a substring, rather than performing a search for the hard-coded
^O character.

That works better on terminals where ^O is not the correct value for
exit_alt_charset_mode. But it works worse on terminals that don't have a
definition specified for exit_alt_charset_mode.

For example:

% TERMCAP='xterm:me=\E[m:' TERM=xterm vi
segmentation fault (core dumped) TERMCAP='xterm:me=\E[m:' TERM=xterm vi

The crash can be avoided (without fixing the bug) by defining
exit_alt_charset_mode:

% TERMCAP='xterm|:me=\E[m:ae=:' TERM=xterm vi
ex/vi: Error: xterm: No such process

We now test exit_alt_charset_mode for NULL before continuing with the fatal
test, restoring the original no-crash behaviour.

XXX does_ctrl_o() is now just a naive reimplementation of strstr(), so should
probably just use strstr() instead.

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Extend does_ctrl_o() to compare exit attribute and ext ACS sequences.

Add capfile(5) to describe the termcap format.
Adjust various man pages and other documentation to point to capfile(5)
instead of termcap(5).
Remove getcap(3) as curses hasn't been building it for a

Add capfile(5) to describe the termcap format.
Adjust various man pages and other documentation to point to capfile(5)
instead of termcap(5).
Remove getcap(3) as curses hasn't been building it for a long time.
Punt wrterm.c as tset no longer uses it.

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Move longname(3) from curses to terminfo, pre-cursor to fix PR/43386.

Don't assume the terminal has a description.