Aegisub/automation/include/unicode-monkeypatch.lua

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local ffi = require("ffi")
if ffi.os ~= "Windows" then
return
end
-- Safety first!
do
if pcall(string.dump, io.open) then
error("io.open is already patched!")
end
local function index(t, k)
return t[k]
end
if pcall(index, ffi.C, "GetACP") == false then
ffi.cdef[[
uint32_t __stdcall GetACP();
]]
end
end
local CP_UTF8 = 65001
local MB_ERR_INVALID_CHARS = 8
if ffi.C.GetACP() == CP_UTF8 then
-- "Use Unicode UTF-8 for worldwide language support" is ticked.
-- Don't bother patching it.
return
end
ffi.cdef[[
int32_t __stdcall MultiByteToWideChar(
uint32_t CodePage,
uint32_t dwFlags,
const char *lpMultiByteStr,
int32_t cbMultiByte,
wchar_t *lpWideCharStr,
int32_t cchWideChar
);
void *_wfreopen(wchar_t *path, wchar_t *mode, void *file);
int32_t _wrename(wchar_t *oldname, wchar_t *newname);
int32_t _wremove(wchar_t *path);
int32_t _wsystem(wchar_t *command);
char *strerror(int errnum);
]]
local function widen(ch)
local size = ffi.C.MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, ch, #ch, nil, 0)
if size == 0 then
error(fname .. ": invalid character sequence")
end
local buf = ffi.new("wchar_t[?]", size + 1)
if ffi.C.MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, ch, #ch, buf, size) == 0 then
error(fname .. ": char conversion error")
end
return buf
end
local function fileresult(stat, fname)
if stat == 0 then
return true
end
local errno = ffi.errno()
local msg = ffi.C.strerror(errno)
if fname then
return nil, fname .. ": " .. ffi.string(msg), errno
end
return nil, msg, errno
end
local function execresult(stat)
if stat == -1 then
return fileresult(0, nil)
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end
if stat == 0 then
return true, "exit", stat
end
return nil, "exit", stat
end
local orig_open = io.open
local orig_rename = os.rename
local orig_remove = os.remove
local orig_execute = os.execute
function io.open(fname, mode)
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local wfname = widen(fname)
if not mode then
mode = "r"
end
local wmode = widen(mode)
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local file = assert(orig_open("nul", "rb"))
if ffi.C._wfreopen(wfname, wmode, file) == nil then
local msg, errno = select(2, file:close())
return nil, fname .. ": " .. msg, errno
end
return file
end
function os.rename(oldname, newname)
local woldname = widen(oldname)
local wnewname = widen(newname)
local stat = ffi.C._wrename(woldname, wnewname)
return fileresult(stat, oldname)
end
function os.remove(fname)
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local wfname = widen(fname)
local stat = ffi.C._wremove(wfname)
return fileresult(stat, fname)
end
function os.execute(command)
local wcommand = command
if command then
wcommand = widen(command)
local stat = ffi.C._wsystem(wcommand)
return execresult(stat)
end
return true
end