ATMApi.lua

function cardIn()
    card = io.open("disk/id.txt")
    if card == nil then return false
    else return true
    end
    card.close()
end

function getCardId()
    card = io.open("disk/id.txt")
    for line in card:lines() do
        if cardIn() ~= false then return line end
    end
end

function printCent(y, s)
    w,h = term.getSize()
    x = math.floor((w - string.len(s)) / 2)
    term.setCursorPos(x, y)
    term.clearLine()
    term.write(s)
 end

 function getCardData()
    rednet.send(0, "client " .. getCardId())
    id, message = rednet.receive()
    return message
 end