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https://github.com/20kdc/OC-KittenOS.git
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75 lines
1.5 KiB
Lua
75 lines
1.5 KiB
Lua
-- This is released into the public domain.
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-- No warranty is provided, implied or otherwise.
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local function ensureMode(mode)
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local n = "rb"
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if type(mode) == "boolean" then
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if mode then
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n = "wb"
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end
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elseif type(mode) == "string" then
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if mode == "append" then
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n = "ab"
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else
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error("Invalid fmode " .. mode)
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end
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else
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error("Invalid fmode")
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end
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return n
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end
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local function create(dev, file, mode)
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local n = ensureMode(mode)
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local handle, r = dev.open(file, n)
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if not handle then return nil, r end
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local open = true
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local function closer()
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if not open then return end
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open = false
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pcall(function()
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dev.close(handle)
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end)
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end
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local function reader(len)
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if not open then return end
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if len == "*a" then
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local ch = ""
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local c = dev.read(handle, neo.readBufSize)
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while c do
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ch = ch .. c
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c = dev.read(handle, neo.readBufSize)
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end
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return ch
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end
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if type(len) ~= "number" then error("Length of read must be number or '*a'") end
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return dev.read(handle, len)
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end
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local function writer(txt)
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if not open then return end
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neo.ensureType(txt, "string")
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return dev.write(handle, txt)
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end
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local function seeker(whence, point)
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if not open then return end
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return dev.seek(handle, whence, point)
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end
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if mode == "rb" then
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return {
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close = closer,
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seek = seeker,
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read = reader
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}, closer
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else
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return {
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close = closer,
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seek = seeker,
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read = reader,
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write = writer
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}, closer
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end
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end
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return {
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ensureMode = ensureMode,
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create = create
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}
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