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120 lines
3.3 KiB
120 lines
3.3 KiB
/***
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*varargs.h - XENIX style macros for variable argument functions
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*
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* Copyright (c) 1985-1994, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* This file defines XENIX style macros for accessing arguments of a
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* function which takes a variable number of arguments.
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* [System V]
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*
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****/
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#ifndef _INC_VARARGS
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#define _INC_VARARGS
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if __STDC__
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#error varargs.h incompatible with ANSI (use stdarg.h)
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#endif
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#ifndef _VA_LIST_DEFINED
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#ifdef _M_ALPHA
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typedef struct {
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char *a0; /* pointer to first homed integer argument */
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int offset; /* byte offset of next parameter */
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} va_list;
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#else
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typedef char *va_list;
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#endif
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#define _VA_LIST_DEFINED
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#endif
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#if defined(_M_IX86)
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/*
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* define a macro to compute the size of a type, variable or expression,
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* rounded up to the nearest multiple of sizeof(int). This number is its
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* size as function argument (Intel architecture). Note that the macro
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* depends on sizeof(int) being a power of 2!
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*/
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#define _INTSIZEOF(n) ( (sizeof(n) + sizeof(int) - 1) & ~(sizeof(int) - 1) )
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#define va_dcl va_list va_alist;
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#define va_start(ap) ap = (va_list)&va_alist
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#define va_arg(ap,t) ( *(t *)((ap += _INTSIZEOF(t)) - _INTSIZEOF(t)) )
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#define va_end(ap) ap = (va_list)0
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#elif defined(_M_MRX000) /* _MIPS_ */
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#define va_dcl int va_alist;
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#define va_start(list) list = (char *) &va_alist
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#define va_end(list)
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#define va_arg(list, mode) ((mode *)(list =\
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(char *) ((((int)list + (__builtin_alignof(mode)<=4?3:7)) &\
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(__builtin_alignof(mode)<=4?-4:-8))+sizeof(mode))))[-1]
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/* +++++++++++++++++++++++++++++++++++++++++++
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Because of parameter passing conventions in C:
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use mode=int for char, and short types
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use mode=double for float types
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use a pointer for array types
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+++++++++++++++++++++++++++++++++++++++++++ */
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#elif defined(_M_ALPHA)
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/*
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* The Alpha compiler supports two builtin functions that are used to
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* implement stdarg/varargs. The __builtin_va_start function is used
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* by va_start to initialize the data structure that locates the next
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* argument. The __builtin_isfloat function is used by va_arg to pick
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* which part of the home area a given register argument is stored in.
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* The home area is where up to six integer and/or six floating point
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* register arguments are stored down (so they can also be referenced
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* by a pointer like any arguments passed on the stack).
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*/
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extern void * __builtin_va_start(va_list, ...);
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#define va_dcl long va_alist;
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#define va_start(list) __builtin_va_start(list, va_alist, 0)
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#define va_end(list)
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#define va_arg(list, mode) \
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( *( ((list).offset += ((int)sizeof(mode) + 7) & -8) , \
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(mode *)((list).a0 + (list).offset - \
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((__builtin_isfloat(mode) && (list).offset <= (6 * 8)) ? \
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(6 * 8) + 8 : ((int)sizeof(mode) + 7) & -8) \
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) \
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) \
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)
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#else
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/* A guess at the proper definitions for other platforms */
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#define _INTSIZEOF(n) ( (sizeof(n) + sizeof(int) - 1) & ~(sizeof(int) - 1) )
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#define va_dcl va_list va_alist;
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#define va_start(ap) ap = (va_list)&va_alist
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#define va_arg(ap,t) ( *(t *)((ap += _INTSIZEOF(t)) - _INTSIZEOF(t)) )
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#define va_end(ap) ap = (va_list)0
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _INC_VARARGS */
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