Don't eat 0 width characters, print them.

Handle the case where the cursor is on the first character.
set -o vi
x ESC ~
(Robert Morris)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279545

Add casts to appease conversions between wchar_t and wint_t

fix build error with SDEBUG, MAP_DEBUG, DEBUG_REFRESH

Fix mis-applied change in previous. Don't increment r_oldcv twice.
PR lib/53803

Apply revisions 1.21, 1.22 from OpenBSD:

In re_fastputc(), set lastline to the new line, not the previous
line so it gets initialized properly. Fixes a crash in bc with
MALLOC_OPTIONS=UJ. OK deraa

Apply revisions 1.21, 1.22 from OpenBSD:

In re_fastputc(), set lastline to the new line, not the previous
line so it gets initialized properly. Fixes a crash in bc with
MALLOC_OPTIONS=UJ. OK deraadt@, committing on behalf of yasuoka@

Initialize "old" screen buffer lines before use; otherwise, they would
never get NUL-terminated and cause read buffer overruns.
This fixes for example segfaults in sftp(1) that could be triggered
by typing in an extremely long string (more than one line - the longer,
the likelier to crash), then hitting backspace once.
Problem reported and patch OK'ed by sthen@.

XXX: pullup-8

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Allow wide characters (properly encoded as byte strings according to LC_CTYPE)
to be (perhaps part of) the "invisible" characters in a prompt, or the
required prompt character which follows the liter

Allow wide characters (properly encoded as byte strings according to LC_CTYPE)
to be (perhaps part of) the "invisible" characters in a prompt, or the
required prompt character which follows the literal sequence (this character
must be one with a printing column width >= 1). The literal indicator
character (which is just a marker, and not printed anywhere) (the PSlit
parameter in sh(1)) can also be a wide char (passed to libedit as a wchar_t,
encoded as that by sh(1) or other applications that support this.)

Note: this has currently only been tested with everything ascii (C locale).

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fix comment

- add literal sequence handling.

s/protected/libedit_private/g

fix typos from Pedro Giffuni @FreeBSD

Get rid of private/public; keep protected (Ingo Schwarze)

Char -> wchar_t from Ingo Schwarze.

more macro WIDECHAR undoing from Ingo Schwarze.

More WIDECHAR elimination (Ingo Schwarze)

PR/50880: David Binderman: Remove redundant code.
While here, fix all debugging formats.

whitespace and header sorting changes (Ingo Schwarze). No functional changes.

More header cleanups from Ingo Schwarze.

From Ingo Scharze:
Let "el.h" include everything needed for struct editline,
and don't include that stuff multiple times. That also improves
consistency, also avoids circular inclusions, and also ma

From Ingo Scharze:
Let "el.h" include everything needed for struct editline,
and don't include that stuff multiple times. That also improves
consistency, also avoids circular inclusions, and also makes it
easier to follow what is going on, even though not quite as nice.
But it seems like the best we can do...

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cleanup chartype.h includes (Ingo Schwarze)

cleanup inclusion of histedit.h (Ingo Schwarze)

From Ingo Schwarze:

As we have seen before, "histedit.h" can never get rid of including
the <wchar.h> header because using the data types defined there is
deeply ingrained in the public interfaces o

From Ingo Schwarze:

As we have seen before, "histedit.h" can never get rid of including
the <wchar.h> header because using the data types defined there is
deeply ingrained in the public interfaces of libedit.

Now POSIX unconditionally requires that <wchar.h> defines the type
wint_t. Consequently, it can be used unconditionally, no matter
whether WIDECHAR is active or not. Consequently, the #define Int
is pointless.

Note that removing it is not gratuitious churn. Auditing for
integer signedness problems is already hard when only fundamental
types like "int" and "unsigned" are involved. It gets very hard
when types come into the picture that have platform-dependent
signedness, like "char" and "wint_t". Adding yet another layer
on top, changing both the signedness and the width in a platform-
dependent way, makes auditing yet harder, which IMHO is really
dangerous. Note that while removing the #define, i already found
one bug caused by this excessive complication - in the function
re_putc() in refresh.c. If WIDECHAR was defined, it printed an
Int = wint_t value with %c. Fortunately, that bug only affects
debugging, not production. The fix is contained in the patch.

With WIDECHAR, this doesn't change anything. For the case without
WIDECHAR, i checked that none of the places wants to store values
that might not fit in wint_t.

This only changes internal interfaces; public ones remain unchanged.

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- Add some more Char casts
- reduce ifdefs by providing empty defs for nls functions (Ingo Schwarze)

pass -Wconversion

term -> terminal
XXX: need to rename key_ too.