VARARG PTR

Data Type : Extension Manager

VARARG_PTR - Pointer to a variable argument list.

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#include <global.h>

Definition :

#if defined(OSF) || (defined(NT) && defined(_ALPHA_))
#include <stdarg.h>
#define VARARG_PTR   va_list
#elif defined(OS400)
#include <stdarg.h>
typedef struct {
   char * vaold;
   char * vanew;
} VARARG_PTR;
#else
typedef char * VARARG_PTR;
#endif

Description :

The VARARG macros support access to variable argument lists. These argument lists appear in the C API in two places, functions with "cdecl" argument lists and in the Extension Manager facility.

VARARG_PTR is a type definition for a pointer into a variable argument list. This pointer is initialized by the VARARG_START() macro. The pointer is then used in the VARARG_GET(), and VARARG_PEEK() macros to access elements of the argument list.

Sample Usage :

void far cdecl SampleRoutine (
    char *String,
    WORD LastNamedArgument, ...)
{
  DWORD temp1;
  WORD  temp2;
  VARARG_PTR ap;

  VARARG_START(ap,LastNamedArgument);
        /* Start out just past last named argument */
  temp1 = VARARG_GET(ap,DWORD);
        /* Get next DWORD into temp1 and advance */
  temp2 = VARARG_PEEK(ap,WORD);
        /* Peek at next WORD, but no advance */
  temp2 = VARARG_GET(ap,WORD);
        /* Get next WORD into temp2 and advance */
}

See Also : VARARG_GET VARARG_PEEK VARARG_START

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