UTF-16 surrogate macros

[Andy Koppe]

w32api/winnls.h is lacking the macros for recognising UTF-16
surrogates: IS_HIGH_SURROGATE, IS_LOW_SURROGATE, IS_SURROGATE_PAIR.
Here's one way to define them, which avoids evaluating the characters
twice:

#define IS_HIGH_SURROGATE(c) (((c) & 0xFC00) == 0xD800)
#define IS_LOW_SURROGATE(c) (((c) & 0xFC00) == 0xDC00)
#define IS_SURROGATE_PAIR(hc,lc) (IS_HIGH_SURROGATE(hc) && IS_LOW_SURROGATE(lc))

Andy

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple