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return function(utf8)
local ffi = require("ffi")
if ffi.os == "Windows" then
os.setlocale(utf8.config.locale or "english_us.65001", "ctype")
ffi.cdef[[
short towupper(short c);
short towlower(short c);
]]
else
os.setlocale(utf8.config.locale or "C.UTF-8", "ctype")
ffi.cdef[[
int towupper(int c);
int towlower(int c);
]]
end
utf8:require "primitives.dummy"
if not utf8.config.conversion.uc_lc then
function utf8.lower(str)
local bs = 1
local nbs
local bytes = utf8.raw.len(str)
local res = {}
while bs <= bytes do
nbs = utf8.next(str, bs)
local cp = utf8.unicode(str, bs, nbs)
res[#res + 1] = ffi.C.towlower(cp)
bs = nbs
end
return utf8.char(utf8.config.unpack(res))
end
end
if not utf8.config.conversion.lc_uc then
function utf8.upper(str)
local bs = 1
local nbs
local bytes = utf8.raw.len(str)
local res = {}
while bs <= bytes do
nbs = utf8.next(str, bs)
local cp = utf8.unicode(str, bs, nbs)
res[#res + 1] = ffi.C.towupper(cp)
bs = nbs
end
return utf8.char(utf8.config.unpack(res))
end
end
return utf8
end
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