110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/*
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* stdarg.h
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*
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* Provides facilities for stepping through a list of function arguments of
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* an unknown number and type.
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*
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* NOTE: Gcc should provide stdarg.h, and I believe their version will work
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* with crtdll. If necessary I think you can replace this with the GCC
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* stdarg.h.
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*
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* Note that the type used in va_arg is supposed to match the actual type
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* *after default promotions*. Thus, va_arg (..., short) is not valid.
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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 _STDARG_H_
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#define _STDARG_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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* Don't do any of this stuff for the resource compiler.
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*/
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#ifndef RC_INVOKED
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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 _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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/*
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* Start variable argument list processing by setting AP to point to the
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* argument after pN.
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*/
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#ifdef __GNUC__
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/*
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* In GNU the stack is not necessarily arranged very neatly in order to
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* pack shorts and such into a smaller argument list. Fortunately a
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* neatly arranged version is available through the use of __builtin_next_arg.
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*/
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#define va_start(ap, pN) \
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((ap) = ((va_list) __builtin_next_arg(pN)))
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#else
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/*
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* For a simple minded compiler this should work (it works in GNU too for
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* vararg lists that don't follow shorts and such).
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*/
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#define va_start(ap, pN) \
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((ap) = ((va_list) (&pN) + __va_argsiz(pN)))
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#endif
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/*
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* End processing of variable argument list. In this case we do nothing.
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*/
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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 _STDARG_H_ */
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