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lua-icu-date-ffi's Issues

Allocated char size in function "uchar_to_string" in icu-date.lua not enough for non-ASCII characters

Possibly, allocated char size in function "uchar_to_string" in icu-date.lua not enough for non-ASCII characters.

...
local function uchar_to_string(uchar)
  local length = call_fn("u_strlen", uchar) + 1
  local str = ffi.new('char[?]', length)
  call_fn("u_austrcpy", str, uchar)
  return ffi.string(str)
end
...

For example:

local icu_date = require("icu-date")
local format_date = icu_date.formats.pattern("yyyy-MM-dd")
local format_custom = icu_date.formats.pattern('cccc', "ru_RU")
local date = icu_date.new({locale="ru_RU"})
for i = 1,7 do
	date:parse(format_date, '2000-01-0' .. tostring(i))
	print(date:format(format_custom))
end

So, before changes I've been getting this result:
суббота
воскресе#
понедель#
втор#
сред#
четв#
пятн#

But after changing
local length = call_fn("u_strlen", uchar) + 1 to local length = call_fn("u_strlen", uchar) + 6
everything is fine:
суббота
воскресенье
понедельник
вторник
среда
четверг
пятница

Maybe, I'm wrong and problem in another place..

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