[Nasm-devel] Min Max preprocessor operator

[Lars M. <lar...@te...>]

Hello,
today i stumbled upon the following problem: imagine you'r defining a 
struct via constants and you want to use a c union-like layout, for example:

%define TYPE_ARRAY_OFFSET_DATA_TYPE     0x0000
%define TYPE_ARRAY_OFFSET_LENGTH        0x0004
%define TYPE_ARRAY_SIZE                 0x0008

%define TYPE_STRUCT_ .... [and so on]

%define TYPE_OFFSET_INDEX               0x0000
%define TYPE_OFFSET_LAYOUT 0x0004                              ; union 
of type_array, type_struct
%define TYPE_SIZE                       max TYPE_ARRAY_SIZE, 
TYPE_STRUCT_SIZE

%define TYPE_LAYOUT_ARRAY_DATA_TYPE     ( TYPE_OFFSET_LAYOUT + 
TYPE_ARRAY_OFFSET_DATA_TYPE )
%define TYPE_LAYOUT_ARRAY_LENGTH        ( TYPE_OFFSET_LAYOUT + 
TYPE_ARRAY_OFFSET_LENGTH )


thus you have a full type_array or type_struct structure at 
TYPE_OFFSET_LAYOUT. Now I need the max-macro to get the maximum size of 
both structures.
I could calc this value manually, but this is not the sense of a 
preprocessor.

I tried to implement it via macros but this won't work. Any ideas? Maybe 
add the min, max operator to the preprocessor?

Best wishes!