99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
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/*
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* varargs.h
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*
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* Old, non-ANSI facilities for stepping through a list of function
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* arguments of an unknown number and type.
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* TODO: Has not been tested. Essentially it copies the GCC version.
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*
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* NOTE: I believe GCC supplies a version of this header as well (in
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* addition to stdarg.h and others). The GCC version is more
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* complex, to deal with many alternate systems, but it is
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* probably more trustworthy overall. It would probably be
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* better to use the GCC version.
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*
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* NOTE: These are incompatible with the versions in stdarg.h and should
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* NOT be mixed! All new code should use the ANSI compatible versions.
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*
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* This file is part of the Mingw32 package.
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*
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* Contributors:
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* Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
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*
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* THIS SOFTWARE IS NOT COPYRIGHTED
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*
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* This source code is offered for use in the public domain. You may
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* use, modify or distribute it freely.
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*
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* This code is distributed in the hope that it will be useful but
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* WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
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* DISCLAMED. This includes but is not limited to warranties of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Revision$
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* $Author$
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* $Date$
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*
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*/
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#ifndef __STRICT_ANSI__
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#ifndef _VARARGS_H_
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#define _VARARGS_H_
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/* All the headers include this file. */
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#include <_mingw.h>
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/*
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* I was told that Win NT likes this.
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*/
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#ifndef _VA_LIST_DEFINED
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#define _VA_LIST_DEFINED
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#endif
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#ifndef RC_INVOKED
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#ifndef _VA_LIST
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#define _VA_LIST
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typedef char* va_list;
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#endif
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/*
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* Amount of space required in an argument list (ie. the stack) for an
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* argument of type t.
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*/
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#define __va_argsiz(t) \
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(((sizeof(t) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))
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#define va_alist __builtin_va_alist
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/*
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* Used in old style argument lists IIRC. The ellipsis forces the compiler
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* to realize this is a vararg function.
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*/
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#define va_dcl int __builtin_va_alist; ...
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#define va_start(ap) \
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((ap) = ((va_list) &__builtin_va_alist))
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#define va_end(ap) ((void)0)
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/*
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* Increment ap to the next argument in the list while returing a
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* pointer to what ap pointed to first, which is of type t.
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*
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* We cast to void* and then to t* because this avoids a warning about
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* increasing the alignment requirement.
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*/
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#define va_arg(ap, t) \
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(((ap) = (ap) + __va_argsiz(t)), \
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*((t*) (void*) ((ap) - __va_argsiz(t))))
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#endif /* Not RC_INVOKED */
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#endif /* Not _VARARGS_H_ */
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#endif /* Not __STRICT_ANSI__ */
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