- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Back out 2nd part of wrong iswascii() change in prev. commit.

The problem is: currently our single byte ctype(3) functions are broken
for wide characters locales in the argument range >= 0x80 - they may
return false positives.

Example 1: for UTF-8 locale we currently have:
iswspace(0xA0)==1 and isspace(0xA0)==1
(because iswspace() and isspace() are the same code)
but must have
iswspace(0xA0)==1 and isspace(0xA0)==0
(because there is no such character and all others in the range
0x80..0xff for the UTF-8 locale, it keeps ASCII only in the single byte
range because our internal wchar_t representation for UTF-8 is UCS-4).

Example 2: for all wide character locales isalpha(arg) when arg > 0xFF may
return false positives (must be 0).
(because iswalpha() and isalpha() are the same code)

This change address this issue separating single byte and wide ctype
and also fix iswascii() (currently iswascii() is broken for
arguments > 0xFF).
This change is 100% binary compatible with old binaries.

Reviewied by: i18n@

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

Move wcwidth() to separate file, it doesn't belong to iswctype.c at all

According to SUSv2, wcwidth() should return -1 for non-printing characters

Cosmetic - remove unneded brackets and #undef

wcwidth: fix espression to work correctly with SWIDTH0

Add iswctype wcwidth function code

Submitted by: clkao@clkao.org
Reviewed by: keichii
Obtained from: NetBSD
MFC after: 1 month

Implement the missing <wctype.h> functions: isw*() (iswalnum() etc.),
towlower() and towupper() required by ISO C90 Amd. 1.

iswascii(), iswhexnumber(), iswideogram(), iswnumber(), iswphonogram(),
iswrune() and iswspecial() have also been implemented for consistency
with the BSD extensions in <ctype.h>.