util.startup: Close state on exit to ensure GC finalizers are called
Ensures a last round of garbage collection and that finalizers are
called. Fixes things like proper closing of SQLite3 state.
There are more calls to os.exit() but most of them exit with an error or
in a case where a final GC sweep might not matter as much.
It would be nice if this was the default.
Calling util.statup.exit() everywhere may be sensible, but would be more
involved, requiring imports everywhere.
local s_char = string.char;
local s_format = string.format;
local s_gsub = string.gsub;
local s_lower = string.lower;
local char_to_hex = {};
local hex_to_char = {};
do
local char, hex;
for i = 0,255 do
char, hex = s_char(i), s_format("%02x", i);
char_to_hex[char] = hex;
hex_to_char[hex] = char;
end
end
local function to(s)
return (s_gsub(s, ".", char_to_hex));
end
local function from(s)
return (s_gsub(s_lower(s), "%X*(%x%x)%X*", hex_to_char));
end
return {
encode = to, decode = from;
-- COMPAT w/pre-0.12:
to = to, from = from;
};