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[glibc.git] / sysdeps / generic / varargs.h
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1 /* Copyright (C) 1991, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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 not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #ifndef _VARARGS_H
21 #define _VARARGS_H 1
22 #include <features.h>
24 #ifdef __GNUC__
26 #define va_alist __builtin_va_alist
27 #define va_dcl int __builtin_va_alist;
28 #define va_list char *
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)
39 #define __va_rounded_size(TYPE) \
40 (((sizeof (TYPE) + sizeof (int) - 1) / sizeof (int)) * sizeof (int))
42 #define va_arg(AP, TYPE) \
43 (*((TYPE *) (AP += __va_rounded_size (TYPE), \
44 AP - __va_rounded_size (TYPE))))
46 #else /* Not GCC. */
48 /* Implement varargs on top of our stdarg implementation. */
50 #include <stdarg.h>
52 #define va_alist __va_fakearg
53 #define va_dcl int __va_fakearg;
55 #undef va_start
56 #define va_start(ap) (__va_start((ap), __va_fakearg), \
57 (ap) -= sizeof(__va_fakearg))
59 #endif /* GCC. */
61 #endif /* varargs.h */