ReactOS 0.4.15-dev-7906-g1b85a5f
varargs.h
Go to the documentation of this file.
1/* @(#)varargs.h 1.8 14/01/06 Copyright 1998-2014 J. Schilling */
2/*
3 * Generic header for users of var args ...
4 *
5 * Includes a default definition for va_copy()
6 * and some magic know how about the SVr4 Power PC var args ABI
7 * to create a __va_arg_list() macro.
8 *
9 * The __va_arg_list() macro is needed to fetch a va_list type argument
10 * from a va_list. This is needed to implement a recursive "%r" printf.
11 *
12 * Copyright (c) 1998-2014 J. Schilling
13 */
14/*
15 * The contents of this file are subject to the terms of the
16 * Common Development and Distribution License, Version 1.0 only
17 * (the "License"). You may not use this file except in compliance
18 * with the License.
19 *
20 * See the file CDDL.Schily.txt in this distribution for details.
21 * A copy of the CDDL is also available via the Internet at
22 * http://www.opensource.org/licenses/cddl1.txt
23 *
24 * When distributing Covered Code, include this CDDL HEADER in each
25 * file and include the License file CDDL.Schily.txt from this distribution.
26 */
27
28#ifndef _SCHILY_VARARGS_H
29#define _SCHILY_VARARGS_H
30
31#ifndef _SCHILY_MCONFIG_H
32#include <schily/mconfig.h>
33#endif
34
35#ifdef __cplusplus
36extern "C" {
37#endif
38
39#ifdef PROTOTYPES
40/*
41 * For ANSI C-compilers prefer stdarg.h
42 */
43# ifdef HAVE_STDARG_H
44# ifndef _INCL_STDARG_H
45# include <stdarg.h>
46# define _INCL_STDARG_H
47# endif
48# else
49# ifndef _INCL_VARARGS_H
50# include <varargs.h>
51# define _INCL_VARARGS_H
52# endif
53# endif
54#else
55/*
56 * For K&R C-compilers prefer varargs.h
57 */
58# ifdef HAVE_VARARGS_H
59# ifndef _INCL_VARARGS_H
60# include <varargs.h>
61# define _INCL_VARARGS_H
62# endif
63# else
64# ifndef _INCL_STDARG_H
65# include <stdarg.h>
66# define _INCL_STDARG_H
67# endif
68# endif
69#endif
70
71#if (defined(__linux__) || defined(__linux) || defined(sun)) && \
72 (defined(__ppc) || defined(__PPC) || \
73 defined(powerpc) || defined(__powerpc__))
74
75# ifndef VA_LIST_IS_ARRAY
76# define VA_LIST_IS_ARRAY
77# endif
78#endif
79
80
81/*
82 * __va_copy() is used by GCC 2.8 or newer until va_copy() becomes
83 * a final ISO standard.
84 */
85#if !defined(va_copy) && !defined(HAVE_VA_COPY)
86# if defined(__va_copy)
87# define va_copy(to, from) __va_copy(to, from)
88# endif
89#endif
90
91/*
92 * va_copy() is a Solaris extension to provide a portable way to perform a
93 * variable argument list "bookmarking" function.
94 * If it is not available via stdarg.h, use a simple assignement for backward
95 * compatibility.
96 */
97#if !defined(va_copy) && !defined(HAVE_VA_COPY)
98#ifdef VA_LIST_IS_ARRAY
99# define va_copy(to, from) ((to)[0] = (from)[0])
100#else
101# define va_copy(to, from) ((to) = (from))
102#endif
103#endif
104
105/*
106 * I don't know any portable way to get an arbitrary
107 * C object from a var arg list so I use a
108 * system-specific routine __va_arg_list() that knows
109 * if 'va_list' is an array. You will not be able to
110 * assign the value of __va_arg_list() but it works
111 * to be used as an argument of a function.
112 * It is a requirement for recursive printf to be able
113 * to use this function argument. If your system
114 * defines va_list to be an array you need to know this
115 * via autoconf or another mechanism.
116 * It would be nice to have something like
117 * __va_arg_list() in stdarg.h
118 */
119
120#ifdef VA_LIST_IS_ARRAY
121# define __va_arg_list(list) va_arg(list, void *)
122#else
123# define __va_arg_list(list) va_arg(list, va_list)
124#endif
125
126/*
127 * This structure allows to work around the C limitation that a variable of
128 * type array cannot appear at the left side of an assignement operator.
129 * By putting va_list inside a struture, the assignement will work even in case
130 * that va_list is an array2.
131 */
132typedef struct {
134} va_lists_t;
135
136#ifdef __cplusplus
137}
138#endif
139
140#endif /* _SCHILY_VARARGS_H */
char * va_list
Definition: acmsvcex.h:78
va_list ap
Definition: varargs.h:133