mirror of https://github.com/20kdc/OC-KittenOS.git
79 lines
2.1 KiB
Lua
79 lines
2.1 KiB
Lua
-- Copyright (C) 2018-2021 by KittenOS NEO contributors
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--
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-- Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
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-- THIS SOFTWARE.
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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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