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- Subject: Re: Bug in string.unpack
- From: dyngeccetor8 <dyngeccetor8@...>
- Date: Thu, 12 Mar 2020 20:53:30 +0300
On 12/03/2020 20.06, cherue wrote:
> Hello,
>
> I found a bug in string.unpack:
>
> ```
> Lua 5.3.5 Copyright (C) 1994-2018 Lua.org, PUC-Rio
>> string.unpack("I4", "\255\255\255\255")
> 4294967295 5
>> string.unpack("I8", "\255\255\255\255\255\255\255\255")
> -1 9
>> string.unpack("I8", "\255\255\255\255\255\255\255\127")
> 9223372036854775807 9
>> string.unpack("I8", "\255\255\255\255\255\255\255\128")
> -9151314442816847873 9
> ```
>
> I tried looking for the cause but I am not fluent in C. Maybe something about lua_Integer?
>
So where is the bug?
In my point of view you've got quite consistent results
for two's-complement little-endian integer encoding.
-- Martin
