Add imctrl and imkey options, inspired by cannactrl and fepkey options in
nvi-m17n by itojun.

If imctrl option is set, input method is controlled by using escape
sequences compatible to Tera Term and RLogin. The state of input method in
commands specified by imkey option is saved and restored automatically.
Input method is then deactivated on returning to command mode.

branches: 1.9.2;
When testing to see if a signal handler was previously installed in
h_winch, test sa_handler against all SIG_* actions defined in sys/signal.h
instead of just 0. Corrects an issue where vi crashes after a window is
resized.

Introduce HAVE_XXX macros to where they should be.
No binary changes, but possibly improve portability for, e.g.,
sync with pkgsrc version in the near future.

No need to include ip_extern.h here.
No binary changes.

When resizing nvi in xterm, a scroll region is set with the old size
which garbles the display.

The scroll region is set for a terminfo scroll operation and then
reset to the current window size. While xterm lets you clear a
scroll region, there is no way to do this in terminfo except by
resetting the terminal which has a visual side effect.

Xterm actually clears the scroll region as part of the resize but
that happens before a program gets the SIGWINCH signal. When nvi sees
the SIGWINCH signal, it exits the vi mode using a scroll operation to
tidy up the display before it reenters vi mode with the new window size.

This patch does two things:
- make nvi also invoke a previous SIGWINCH handler (not sufficient,
but that's how curses wants it).
- skip the tidy up in case of a restart (avoids the scroll region)

branches: 1.5.8;
PR/50092: Rin Okuyama: Fix memory leaks in vi when resizing.

branches: 1.4.4; 1.4.6; 1.4.8; 1.4.10; 1.4.12;
Fix RCSID's

don't use err, it conflicts with err(3)

Apply our local changes.

branches: 1.1.1;
Initial revision

When testing to see if a signal handler was previously installed in
h_winch, test sa_handler against all SIG_* actions defined in sys/signal.h
instead of just 0. Corrects an issue where vi crashes after a window is
resized.

Introduce HAVE_XXX macros to where they should be.
No binary changes, but possibly improve portability for, e.g.,
sync with pkgsrc version in the near future.

No need to include ip_extern.h here.
No binary changes.

When resizing nvi in xterm, a scroll region is set with the old size
which garbles the display.

The scroll region is set for a terminfo scroll operation and then
reset to the current window size. While xterm lets you clear a
scroll region, there is no way to do this in terminfo except by
resetting the terminal which has a visual side effect.

Xterm actually clears the scroll region as part of the resize but
that happens before a program gets the SIGWINCH signal. When nvi sees
the SIGWINCH signal, it exits the vi mode using a scroll operation to
tidy up the display before it reenters vi mode with the new window size.

This patch does two things:
- make nvi also invoke a previous SIGWINCH handler (not sufficient,
but that's how curses wants it).
- skip the tidy up in case of a restart (avoids the scroll region)

branches: 1.5.8;
PR/50092: Rin Okuyama: Fix memory leaks in vi when resizing.

branches: 1.4.4; 1.4.6; 1.4.8; 1.4.10; 1.4.12;
Fix RCSID's

don't use err, it conflicts with err(3)

Apply our local changes.

branches: 1.1.1;
Initial revision

Introduce HAVE_XXX macros to where they should be.
No binary changes, but possibly improve portability for, e.g.,
sync with pkgsrc version in the near future.

No need to include ip_extern.h here.
No binary changes.

When resizing nvi in xterm, a scroll region is set with the old size
which garbles the display.

The scroll region is set for a terminfo scroll operation and then
reset to the current window size. While xterm lets you clear a
scroll region, there is no way to do this in terminfo except by
resetting the terminal which has a visual side effect.

Xterm actually clears the scroll region as part of the resize but
that happens before a program gets the SIGWINCH signal. When nvi sees
the SIGWINCH signal, it exits the vi mode using a scroll operation to
tidy up the display before it reenters vi mode with the new window size.

This patch does two things:
- make nvi also invoke a previous SIGWINCH handler (not sufficient,
but that's how curses wants it).
- skip the tidy up in case of a restart (avoids the scroll region)

branches: 1.5.8;
PR/50092: Rin Okuyama: Fix memory leaks in vi when resizing.

branches: 1.4.4; 1.4.6; 1.4.8; 1.4.10; 1.4.12;
Fix RCSID's

don't use err, it conflicts with err(3)

Apply our local changes.

branches: 1.1.1;
Initial revision

When resizing nvi in xterm, a scroll region is set with the old size
which garbles the display.

The scroll region is set for a terminfo scroll operation and then
reset to the current window size. While xterm lets you clear a
scroll region, there is no way to do this in terminfo except by
resetting the terminal which has a visual side effect.

Xterm actually clears the scroll region as part of the resize but
that happens before a program gets the SIGWINCH signal. When nvi sees
the SIGWINCH signal, it exits the vi mode using a scroll operation to
tidy up the display before it reenters vi mode with the new window size.

This patch does two things:
- make nvi also invoke a previous SIGWINCH handler (not sufficient,
but that's how curses wants it).
- skip the tidy up in case of a restart (avoids the scroll region)

PR/50092: Rin Okuyama: Fix memory leaks in vi when resizing.

branches: 1.4.4; 1.4.6; 1.4.8; 1.4.12;
Fix RCSID's

don't use err, it conflicts with err(3)

Apply our local changes.

branches: 1.1.1;
Initial revision

PR/50092: Rin Okuyama: Fix memory leaks in vi when resizing.

branches: 1.4.4; 1.4.6; 1.4.8;
Fix RCSID's

don't use err, it conflicts with err(3)

Apply our local changes.

branches: 1.1.1;
Initial revision