/***
*varargs.h - XENIX style macros for variable argument functions
*
*	Copyright (c) 1985-1990, Microsoft Corporation. All rights reserved.
*
*Purpose:
*	This file defines XENIX style macros for accessing arguments of a
*	function which takes a variable number of arguments.
*	[System V]
*
****/

#ifndef _INC_VARARGS

#ifdef __cplusplus
extern "C" {
#endif

#ifdef __STDC__
#error varargs.h incompatible with ANSI (use stdarg.h)
#endif

#ifndef _VA_LIST_DEFINED

#ifdef _ALPHA_
typedef struct {
    char *a0;           /* pointer to first homed integer argument */
    int offset;         /* byte offset of next parameter */
} va_list;

#else
typedef char *va_list;
#endif

#define _VA_LIST_DEFINED
#endif



#ifdef _X86_
/*
 * define a macro to compute the size of a type, variable or expression,
 * rounded up to the nearest multiple of sizeof(int). This number is its
 * size as function argument (Intel architecture). Note that the macro
 * depends on sizeof(int) being a power of 2!
 */

#define _INTSIZEOF(n)	 ( (sizeof(n) + sizeof(int) - 1) & ~(sizeof(int) - 1) )

#define va_dcl va_list va_alist;
#define va_start(ap) ap = (va_list)&va_alist
#define va_arg(ap,t)    ( *(t *)((ap += _INTSIZEOF(t)) - _INTSIZEOF(t)) )
#define va_end(ap) ap = (va_list)0
#endif


#if defined(_M_MRX000)
#define va_dcl int va_alist;
#define va_start(list) list = (char *) &va_alist
#define va_end(list)
#define va_arg(list, mode) ((mode *)(list =\
 (char *) ((((int)list + (__builtin_alignof(mode)<=4?3:7)) &\
 (__builtin_alignof(mode)<=4?-4:-8))+sizeof(mode))))[-1]
/*  +++++++++++++++++++++++++++++++++++++++++++
    Because of parameter passing conventions in C:
    use mode=int for char, and short types
    use mode=double for float types
    use a pointer for array types
    +++++++++++++++++++++++++++++++++++++++++++ */
#endif


#ifdef _ALPHA_

/*
 * The Alpha compiler supports two builtin functions that are used to
 * implement stdarg/varargs.  The __builtin_va_start function is used
 * by va_start to initialize the data structure that locates the next
 * argument.  The __builtin_isfloat function is used by va_arg to pick
 * which part of the home area a given register argument is stored in.
 * The home area is where up to six integer and/or six floating point
 * register arguments are stored down (so they can also be referenced
 * by a pointer like any arguments passed on the stack).
 */

#ifdef __cplusplus
extern __builtin_va_start(va_list, ...);
#endif
#define va_dcl long va_alist;
#define va_start(list) __builtin_va_start(list, va_alist, 0)
#define va_end(list)
#define va_arg(list, mode) \
    ( *(        ((list).offset += ((int)sizeof(mode) + 7) & -8) , \
        (mode *)((list).a0 + (list).offset - \
                    ((__builtin_isfloat(mode) && (list).offset <= (6 * 8)) ? \
                        (6 * 8) + 8 : ((int)sizeof(mode) + 7) & -8) \
                ) \
       ) \
    )

#endif /* _ALPHA_ */


#ifdef __cplusplus
}
#endif

#define _INC_VARARGS
#endif	/* _INC_VARARGS */
