workbench/devs/diskimage/include/SDI_stdarg.h

   1 #ifndef SDI_STDARG_H
   2 #define SDI_STDARG_H
   3
   4 /* Includeheader
   5
   6         Name:           SDI_stdarg.h
   7         Versionstring:  $VER: SDI_stdarg.h 1.0 (05.07.2004)
   8         Author:         Jens Langner
   9         Distribution:   PD
  10         Project page:   http://www.sf.net/projects/sditools/
  11         Description:    defines to hide OS specific variable arguments
  12                         function definitions
  13
  14  1.0   05.07.04 : initial version
  15
  16 */
  17
  18 /*
  19 ** This is PD (Public Domain). This means you can do with it whatever you want
  20 ** without any restrictions. I only ask you to tell me improvements, so I may
  21 ** fix the main line of this files as well.
  22 **
  23 ** To keep confusion level low: When changing this file, please note it in
  24 ** above history list and indicate that the change was not made by myself
  25 ** (e.g. add your name or nick name).
  26 **
  27 ** Find the latest version of this file at:
  28 ** http://cvs.sourceforge.net/viewcvs.py/sditools/sditools/headers/
  29 **
  30 ** Jens Langner <Jens.Langner@light-speed.de> and
  31 ** Dirk Stöcker <soft@dstoecker.de>
  32 */
  33
  34 #include "SDI_compiler.h"
  35
  36 /*
  37 ** Variable arguments function macros to allow specification of the
  38 ** variable arguments typical functions like va_list/va_start/va_end in
  39 ** an operating system independent fashion.
  40 **
  41 ** With help of the following macro definition a developer might define
  42 ** variable arguments functions for different types of operating
  43 ** system implementations without having to clutter the sources with
  44 ** multiple "#ifdef" defines just because all of these operating systems
  45 ** come with different varable arguments support functions.
  46 **
  47 ** Example:
  48 **
  49 ** Instead of using the standard va_list, va_start and va_end functions
  50 ** of <stdarg.h>, a developer might specify the following sprintf()
  51 ** function to make it automatically compatible with AmigaOS3, AmigaOS4
  52 ** and also MorphOS.
  53 **
  54 ** int VARARGS68K sprintf(char *buf, char *fmt, ...)
  55 ** {
  56 **   VA_LIST args;
  57 **
  58 **   VA_START(args, fmt);
  59 **   RawDoFmt(fmt, VA_ARG(args, void *), NULL, buf);
  60 **   VA_END(args);
  61 **
  62 **   return(strlen(buf));
  63 ** }
  64 **
  65 ** Please note the uppercase letters of the macros in contrast to the
  66 ** official varargs functions specified in <stdarg.h>.
  67 **
  68 ** By using this schema a developer might ensure full source code backward
  69 ** compatibility to AmigaOS3 without having to introduce dozens of #ifdef
  70 ** statements in his code.
  71 */
  72
  73 #include <stdarg.h>
  74
  75 #ifdef VA_LIST
  76 #undef VA_LIST
  77 #endif
  78 #ifdef VA_START
  79 #undef VA_START
  80 #endif
  81 #ifdef VA_ARG
  82 #undef VA_ARG
  83 #endif
  84 #ifdef VA_END
  85 #undef VA_END
  86 #endif
  87
  88 #if defined(__amigaos4__)
  89   #define VA_LIST             va_list
  90   #define VA_START(va, start) va_startlinear((va), (start))
  91   #define VA_ARG(va, type)    va_getlinearva((va), type)
  92   #define VA_END(va)          va_end((va))
  93 #elif defined(__MORPHOS__)
  94   #define VA_LIST             va_list
  95   #define VA_START(va, start) va_start((va), (start))
  96   #define VA_ARG(va, type)    (va)->overflow_arg_area
  97   #define VA_END(va)          va_end((va))
  98 #else
  99   #define VA_LIST             va_list
 100   #define VA_START(va, start) va_start((va), (start))
 101   #define VA_ARG(va, type)    (va)
 102   #define VA_END(va)          va_end((va))
 103 #endif
 104
 105 #endif /* SDI_STDARG_H */