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141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* @(#)varargs.h 1.8 14/01/06 Copyright 1998-2014 J. Schilling */
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/*
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* Generic header for users of var args ...
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*
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* Includes a default definition for va_copy()
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* and some magic know how about the SVr4 Power PC var args ABI
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* to create a __va_arg_list() macro.
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*
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* The __va_arg_list() macro is needed to fetch a va_list type argument
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* from a va_list. This is needed to implement a recursive "%r" printf.
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*
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* Copyright (c) 1998-2014 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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* A copy of the CDDL is also available via the Internet at
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* http://www.opensource.org/licenses/cddl1.txt
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#ifndef _SCHILY_VARARGS_H
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#define _SCHILY_VARARGS_H
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#ifndef _SCHILY_MCONFIG_H
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#include <schily/mconfig.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef PROTOTYPES
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/*
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* For ANSI C-compilers prefer stdarg.h
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*/
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# ifdef HAVE_STDARG_H
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# ifndef _INCL_STDARG_H
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# include <stdarg.h>
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# define _INCL_STDARG_H
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# endif
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# else
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# ifndef _INCL_VARARGS_H
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# include <varargs.h>
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# define _INCL_VARARGS_H
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# endif
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# endif
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#else
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/*
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* For K&R C-compilers prefer varargs.h
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*/
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# ifdef HAVE_VARARGS_H
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# ifndef _INCL_VARARGS_H
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# include <varargs.h>
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# define _INCL_VARARGS_H
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# endif
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# else
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# ifndef _INCL_STDARG_H
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# include <stdarg.h>
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# define _INCL_STDARG_H
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# endif
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# endif
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#endif
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#if (defined(__linux__) || defined(__linux) || defined(sun)) && \
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(defined(__ppc) || defined(__PPC) || \
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defined(powerpc) || defined(__powerpc__))
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# ifndef VA_LIST_IS_ARRAY
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# define VA_LIST_IS_ARRAY
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# endif
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#endif
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/*
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* __va_copy() is used by GCC 2.8 or newer until va_copy() becomes
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* a final ISO standard.
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*/
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#if !defined(va_copy) && !defined(HAVE_VA_COPY)
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# if defined(__va_copy)
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# define va_copy(to, from) __va_copy(to, from)
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# endif
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#endif
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/*
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* va_copy() is a Solaris extension to provide a portable way to perform a
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* variable argument list "bookmarking" function.
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* If it is not available via stdarg.h, use a simple assignement for backward
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* compatibility.
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*/
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#if !defined(va_copy) && !defined(HAVE_VA_COPY)
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#ifdef VA_LIST_IS_ARRAY
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# define va_copy(to, from) ((to)[0] = (from)[0])
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#else
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# define va_copy(to, from) ((to) = (from))
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#endif
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#endif
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/*
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* I don't know any portable way to get an arbitrary
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* C object from a var arg list so I use a
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* system-specific routine __va_arg_list() that knows
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* if 'va_list' is an array. You will not be able to
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* assign the value of __va_arg_list() but it works
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* to be used as an argument of a function.
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* It is a requirement for recursive printf to be able
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* to use this function argument. If your system
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* defines va_list to be an array you need to know this
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* via autoconf or another mechanism.
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* It would be nice to have something like
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* __va_arg_list() in stdarg.h
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*/
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#ifdef VA_LIST_IS_ARRAY
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# define __va_arg_list(list) va_arg(list, void *)
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#else
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# define __va_arg_list(list) va_arg(list, va_list)
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#endif
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/*
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* This structure allows to work around the C limitation that a variable of
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* type array cannot appear at the left side of an assignement operator.
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* By putting va_list inside a struture, the assignement will work even in case
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* that va_list is an array2.
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*/
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typedef struct {
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va_list ap;
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} va_lists_t;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SCHILY_VARARGS_H */
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