Re: lua_number2integer

[Mike Pall <mikelu-0809@...>]

Cuero Bugot wrote:
> Here is the code which revealed the unconsistency of the number to integer 
> process:
>
>    string.char(112+remaining/256, remaining%256)
>
> where remaining was taken from 0 to 4095.
>
> This code was done assuming that the string.char function was "correctly 
> truncating" the value as C would do it in such a case.

Passing non-integral numbers to library functions expecting
integral numbers is "undefined". There is no "correct rounding
mode" in this case -- Lua is not C.

Rewrite your example as:

  local r = remaining % 256
  string.char(112 + (remaining-r)/256, r)

Or better use the struct library:

  struct.pack(">H", 0x7000+remaining)

Get it from: http://www.inf.puc-rio.br/~roberto/struct/

--Mike