vadefs.h
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上传日期:2007-01-06
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- /* @(#)vadefs.h 1.4 99/11/27 Copyright 1998 J. Schilling */
- /*
- * Generic header for users of var args ...
- *
- * Includes a default definition for va_copy()
- * and some magic know how about the SVr4 Power PC var args ABI
- * to create a __va_arg_list() macro.
- *
- * Copyright (c) 1998 J. Schilling
- */
- /*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #ifndef _VADEFS_H
- #define _VADEFS_H
- #ifndef _MCONFIG_H
- #include <mconfig.h>
- #endif
- #ifdef PROTOTYPES
- /*
- * For ANSI C-compilers prefer stdarg.h
- */
- # ifdef HAVE_STDARG_H
- # include <stdarg.h>
- # else
- # include <varargs.h>
- # endif
- #else
- /*
- * For K&R C-compilers prefer varargs.h
- */
- # ifdef HAVE_VARARGS_H
- # include <varargs.h>
- # else
- # include <stdarg.h>
- # endif
- #endif
- #if (defined(__linux__) || defined(__linux) || defined(sun)) &&
- (defined(__ppc) || defined(__PPC) || defined(powerpc) || defined(__powerpc__))
- # ifndef VA_LIST_IS_ARRAY
- # define VA_LIST_IS_ARRAY
- # endif
- #endif
- /*
- * __va_copy() is used by GCC 2.8 or newer until va_copy() becomes
- * a final ISO standard.
- */
- #if !defined(va_copy) && !defined(HAVE_VA_COPY)
- # if defined(__va_copy)
- # define va_copy(to, from) __va_copy(to, from)
- # endif
- #endif
- /*
- * va_copy() is a Solaris extension to provide a portable way to perform a
- * variable argument list "bookmarking" function.
- * If it is not available via stdarg.h, use a simple assignement for backward
- * compatibility.
- */
- #if !defined(va_copy) && !defined(HAVE_VA_COPY)
- #ifdef VA_LIST_IS_ARRAY
- # define va_copy(to, from) ((to)[0] = (from)[0])
- #else
- # define va_copy(to, from) ((to) = (from))
- #endif
- #endif
- /*
- * I don't know any portable way to get an arbitrary
- * C object from a var arg list so I use a
- * system-specific routine __va_arg_list() that knows
- * if 'va_list' is an array. You will not be able to
- * assign the value of __va_arg_list() but it works
- * to be used as an argument of a function.
- * It is a requirement for recursive printf to be able
- * to use this function argument. If your system
- * defines va_list to be an array you need to know this
- * via autoconf or another mechanism.
- * It would be nice to have something like
- * __va_arg_list() in stdarg.h
- */
- #ifdef VA_LIST_IS_ARRAY
- # define __va_arg_list(list) va_arg(list, void *)
- #else
- # define __va_arg_list(list) va_arg(list, va_list)
- #endif
- #endif /* _VADEFS_H */