reactos/include/msvcrt/stdarg.h

   1 /*
   2  * stdarg.h
   3  *
   4  * Provides facilities for stepping through a list of function arguments of
   5  * an unknown number and type.
   6  *
   7  * NOTE: Gcc should provide stdarg.h, and I believe their version will work
   8  *       with crtdll. If necessary I think you can replace this with the GCC
   9  *       stdarg.h (or is it vararg.h).
  10  *
  11  * Note that the type used in va_arg is supposed to match the actual type
  12  * *after default promotions*. Thus, va_arg (..., short) is not valid.
  13  *
  14  * This file is part of the Mingw32 package.
  15  *
  16  * Contributors:
  17  *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
  18  *
  19  *  THIS SOFTWARE IS NOT COPYRIGHTED
  20  *
  21  *  This source code is offered for use in the public domain. You may
  22  *  use, modify or distribute it freely.
  23  *
  24  *  This code is distributed in the hope that it will be useful but
  25  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  26  *  DISCLAIMED. This includes but is not limited to warranties of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  28  *
  29  * $Revision: 1.5 $
  30  * $Author$
  31  * $Date$
  32  *
  33  */
  34 /* Appropriated for Reactos Crtdll by Ariadne */
  35
  36 #ifndef _STDARG_H_
  37 #define _STDARG_H_
  38
  39 /*
  40  * Don't do any of this stuff for the resource compiler.
  41  */
  42 #ifndef RC_INVOKED
  43
  44 /*
  45  * I was told that Win NT likes this.
  46  */
  47 #ifndef _VA_LIST_DEFINED
  48 #define _VA_LIST_DEFINED
  49 #endif
  50
  51 #ifndef _VA_LIST
  52 #define _VA_LIST
  53 typedef char* va_list;
  54 #endif
  55
  56
  57 /*
  58  * Amount of space required in an argument list (ie. the stack) for an
  59  * argument of type t.
  60  */
  61 #define __va_argsiz(t) \
  62     (((sizeof(t) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))
  63
  64
  65 /*
  66  * Start variable argument list processing by setting AP to point to the
  67  * argument after pN.
  68  */
  69 #ifdef  __GNUC__
  70 /*
  71  * In GNU the stack is not necessarily arranged very neatly in order to
  72  * pack shorts and such into a smaller argument list. Fortunately a
  73  * neatly arranged version is available through the use of __builtin_next_arg.
  74  */
  75 #ifndef va_start
  76 #define va_start(ap, pN) \
  77     ((ap) = ((va_list) __builtin_next_arg(pN)))
  78 #endif
  79 #else
  80 /*
  81  * For a simple minded compiler this should work (it works in GNU too for
  82  * vararg lists that don't follow shorts and such).
  83  */
  84 #ifndef va_start
  85 #define va_start(ap, pN) \
  86     ((ap) = ((va_list) (&pN) + __va_argsiz(pN)))
  87 #endif
  88 #endif
  89
  90
  91 /*
  92  * End processing of variable argument list. In this case we do nothing.
  93  */
  94 #ifndef va_end
  95 #define va_end(ap)  ((void)0)
  96 #endif
  97
  98
  99 /*
 100  * Increment ap to the next argument in the list while returing a
 101  * pointer to what ap pointed to first, which is of type t.
 102  *
 103  * We cast to void* and then to t* because this avoids a warning about
 104  * increasing the alignment requirement.
 105  */
 106
 107 #ifndef va_arg
 108 #define va_arg(ap, t) \
 109     (((ap) = (ap) + __va_argsiz(t)), \
 110     *((t*) (void*) ((ap) - __va_argsiz(t))))
 111 #endif
 112
 113 #endif /* Not RC_INVOKED */
 114
 115 #endif /* not _STDARG_H_ */