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/* ****************************************************************************
* C utilities.
* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
* ************************************************************************* */
#ifndef _CDEFS_H
# error "This file should be included by `cdefs.h`!"
#endif
#include <cdefs/compiler.h>
#include <cdefs/features.h>
/* ************************************************************************* */
/* C declaration */
/* ************************************************************************* */
/* On x86-32 targets, the 'cdecl' attribute causes the compiler to assume that
* the calling function pops off the stack space used to pass arguments. */
#if !defined(__STDC__) || !__STDC__
# define __cdecl
#else
# define __cdecl cdecl
#endif
/* ************************************************************************* */
/* Declaration arguments */
/* ************************************************************************* */
/* ANSI C does not have arguments in function declarations. */
#if __USE_C89
# define _OF(_ARGS) _ARGS
#else
# define _OF(_ARGS) ()
#endif
/* ************************************************************************* */
/* C++ C declarations */
/* ************************************************************************* */
/* C++ needs to know that types and declarations are C, not C++. */
#if __USE_CXX98
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS
# define __END_DECLS
#endif
/* ************************************************************************* */
/* C++ namespaces management */
/* ************************************************************************* */
/* The standard library needs the function from the ISO C90 standard in
* the `std` namespace.
* At the same time, we want to be safe for future changes and we include
* the ISO C99 code in the non-standard namespace `__c99`.
* The C++ wrapper header take case of adding the definition to
* the global namespace. */
#if __USE_CXX98
# define __BEGIN_NAMESPACE_STD namespace std {
# define __USING_NAMESPACE_STD(_NAME) using std::_NAME;
# define __END_NAMESPACE_STD }
# define __BEGIN_NAMESPACE_C99 namespace __c99 {
# define __USING_NAMESPACE_C99 using __c99::_NAME;
# define __END_NAMESPACE_C99 }
#else
# define __BEGIN_NAMESPACE_STD
# define __USING_NAMESPACE_STD(_NAME)
# define __END_NAMESPACE_STD
# define __BEGIN_NAMESPACE_C99
# define __END_NAMESPACE_C99
# define __USING_NAMESPACE_C99
#endif
/* ************************************************************************* */
/* Optimize conditions */
/* ************************************************************************* */
/* Use these macros to optimize a little the produced assembly. */
#ifndef likely
# define likely(_COND) (_COND)
#endif
#ifndef unlikely
# define unlikely(_COND) (_COND)
#endif
/* ************************************************************************* */
/* __concat: Catenate things in macros */
/* ************************************************************************* */
#ifdef __concat
# undef __concat
#endif
#ifdef __concat_
# undef __concat_
#endif
#define __concat_(_X, _Y) _X ## _Y
#define __concat(_X, _Y) __concat_(_X, _Y)
/* ************************************************************************* */
/* __count_va_args: count number of elements in __VA_ARGS__ */
/* ************************************************************************* */
#ifdef __count_va_args
# undef __count_va_args
#endif
#if defined(__GNUC__) && __USE_C99
/* This is something that should work, although I don't really understand the
* trick yet. Source: http://stackoverflow.com/a/2124385/6541022 */
# define __count_va_args(...) \
__count_va_args_(__VA_ARGS__, __count_va_args_rseq_N())
# define __count_va_args_(...) __count_va_args_N(__VA_ARGS__)
# define __count_va_args_N( \
_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, \
_11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
_21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
_31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
_41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
_51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
_61, _62, _63, _N, ...) _N
# define __count_va_args_rseq_N() \
63, 62, 61, 60, 59, 58, 57, 56, 55, 54, \
53, 52, 51, 50, 49, 48, 47, 46, 45, 44, \
43, 42, 41, 40, 39, 38, 37, 36, 35, 34, \
33, 32, 31, 30, 29, 28, 27, 26, 25, 24, \
23, 22, 21, 20, 19, 18, 17, 16, 15, 14, \
13, 12, 11, 10, 9, 8, 7, 6, 5, 4, \
3, 2, 1, 0
#elif __STDC_VERSION__ >= 199901L
# define __count_va_args(...) (0)
#endif
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