sysdeps/generic/varargs.h

   1 /* Copyright (C) 1991 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifndef _VARARGS_H
  20
  21 #define _VARARGS_H      1
  22 #include <features.h>
  23
  24 #ifdef  __GNUC__
  25
  26 #define va_alist  __builtin_va_alist
  27 #define va_dcl    int __builtin_va_alist;
  28 #define va_list   char *
  29
  30 #ifdef __sparc__
  31 #define va_start(AP)                                            \
  32  (__builtin_saveregs (),                                        \
  33   AP = ((void *) &__builtin_va_alist))
  34 #else
  35 #define va_start(AP)  AP=(char *) &__builtin_va_alist
  36 #endif
  37 #define va_end(AP)
  38
  39 #define __va_rounded_size(TYPE)  \
  40   (((sizeof (TYPE) + sizeof (int) - 1) / sizeof (int)) * sizeof (int))
  41
  42 #define va_arg(AP, TYPE)                                        \
  43  (*((TYPE *) (AP += __va_rounded_size (TYPE),                   \
  44               AP - __va_rounded_size (TYPE))))
  45
  46 #else   /* Not GCC.  */
  47
  48 /* Implement varargs on top of our stdarg implementation.  */
  49
  50 #include <stdarg.h>
  51
  52 #define va_alist        __va_fakearg
  53 #define va_dcl          int __va_fakearg;
  54
  55 #undef  va_start
  56 #define va_start(ap)    (__va_start((ap), __va_fakearg), \
  57                          (ap) -= sizeof(__va_fakearg))
  58
  59 #endif  /* GCC.  */
  60
  61 #endif  /* varargs.h  */