OpenEuphoria

Re: define_c_func/proc and 64-bit return types

• Posted by ghaberek (admin) Jul 30, 2012
• 1293 views

Interesting... There is a C_DWORDLONG in std/dll.e, but it's set the same as C_DOUBLE which AFAIK returns a 64-bit floating point value. I just want a 64-bit int.

--** double 64-bits 
C_DOUBLE  = #03000008, 
--** dwordlong 64-bits 
C_DWORDLONG  = #03000008, 

Another problem I've run into is a series of functions that take and/or return the following structure by value!

struct x { 
    float a; 
    float b; 
    float c; 
    float d; 
} 

Now, I can pass four floats to the function quite easily, but I'm thinking this 128-bit return value may be a problem for Euphoria.

So at this point I may have two options:

1. Modify the source of the library to return int64_t and this quad-float structure by reference, then provide my custom-built library instead of the original.
   
   
2. Write a shim library in C that links to the original library, reads the troublesome values and returns a pointer to them.
   
   

-Greg