ucs2utf.pl

来自「PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统」· PL 代码 · 共 21 行

#
# $PostgreSQL: pgsql/src/backend/utils/mb/Unicode/ucs2utf.pl,v 1.2 2003/11/29 22:40:01 pgsql Exp $
# convert UCS-2 to UTF-8
#
sub ucs2utf {
	local($ucs) = @_;
	local $utf;

	if ($ucs <= 0x007f) {
		$utf = $ucs;
	} elsif ($ucs > 0x007f && $ucs <= 0x07ff) {
		$utf = (($ucs & 0x003f) | 0x80) | ((($ucs >> 6) | 0xc0) << 8);
	} else {
		$utf = ((($ucs >> 12) | 0xe0) << 16) | 
			(((($ucs & 0x0fc0) >> 6) | 0x80) << 8) |
				(($ucs & 0x003f) | 0x80);
	}
	return($utf);
}
1;