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VARARG PTR P

Data Type : Extension Manager
VARARG_PTR_P - Pointer to a variable argument list.
#include <global.h>

Definition :

Description :

Pointer to a variable argument list.



    Platforms that strictly comply to the C standard do not allow passing of variable argument lists by reference using '&' and '*' operators because the standard states that you may get undetermined results. However, you are allowed to pass a variable argument list without these operators. On Linux for zSeries, whenever you pass a variable argument list the contents will always be modified upon returning from the function passing it in as a parameter (assuming some function below accesses the list.) For these types of platforms, the following macros are defined to just pass the list without using the '&' operator. All platforms can still use a variable argument list as a pointer by simply using the VARARG_PTR_P type.

    #if defined(ZLINUX)
    typedef VARARG_PTR VARARG_PTR_P;
    #define VARARG_ADDR(_AAP) _AAP
    #define VARARG_DEREF(_AAP) _AAP
    #define VARARG_COPY __va_copy
    #else
    typedef VARARG_PTR * VARARG_PTR_P;
    #define VARARG_ADDR(_AAP) &_AAP
    #define VARARG_DEREF(_AAP) *_AAP
    #define VARARG_COPY(dest, src) (dest)=(src)
    #endif

See Also : VARARG_ADDR VARARG_COPY VARARG_DEREF VARARG_GET VARARG_PEEK VARARG_PTR VARARG_START