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Date: Sun, 9 Aug 2009 12:42:04 +0100
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Subject: UTF-16 surrogate macros
From: Andy Koppe <andy DOT koppe AT gmail DOT com>
To: Cygwin Tech List <cygwin AT cygwin DOT com>
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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

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