ladybird/AK/Random.h
Andreas Kling ae3ffdd521 AK: Make it possible to not using AK classes into the global namespace
This patch adds the `USING_AK_GLOBALLY` macro which is enabled by
default, but can be overridden by build flags.

This is a step towards integrating Jakt and AK types.
2022-11-26 15:51:34 +01:00

63 lines
1.2 KiB
C++

/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Platform.h>
#include <AK/Types.h>
#if defined(AK_OS_SERENITY) || defined(AK_OS_ANDROID)
# include <stdlib.h>
#endif
#if defined(__unix__)
# include <unistd.h>
#endif
#if defined(AK_OS_MACOS)
# include <sys/random.h>
#endif
#if defined(AK_OS_WINDOWS)
# include <random>
# include <unistd.h>
#endif
namespace AK {
inline void fill_with_random([[maybe_unused]] void* buffer, [[maybe_unused]] size_t length)
{
#if defined(AK_OS_SERENITY) || defined(AK_OS_ANDROID)
arc4random_buf(buffer, length);
#elif defined(OSS_FUZZ)
#elif defined(__unix__) or defined(AK_OS_MACOS)
[[maybe_unused]] int rc = getentropy(buffer, length);
#else
char* char_buffer = static_cast<char*>(buffer);
for (size_t i = 0; i < length; i++) {
char_buffer[i] = std::rand();
}
#endif
}
template<typename T>
inline T get_random()
{
T t;
fill_with_random(&t, sizeof(T));
return t;
}
u32 get_random_uniform(u32 max_bounds);
}
#if USING_AK_GLOBALLY
using AK::fill_with_random;
using AK::get_random;
using AK::get_random_uniform;
#endif