//
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// Copyright (c) 2017 James E. King III
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// https://www.boost.org/LICENSE_1_0.txt)
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//
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// Platform-specific random entropy provider platform detection
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//
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#ifndef BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP
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#define BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP
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#include <boost/predef/library/c/cloudabi.h>
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#include <boost/predef/library/c/gnu.h>
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#include <boost/predef/os/bsd/open.h>
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#include <boost/predef/os/windows.h>
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// Note: Don't use Boost.Predef to detect Linux and Android as it may give different results depending on header inclusion order.
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// https://github.com/boostorg/predef/issues/81#issuecomment-413329061
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#if (defined(__linux__) || defined(__linux) || defined(linux)) && (!defined(__ANDROID__) || __ANDROID_API__ >= 28)
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#include <sys/syscall.h>
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#if defined(SYS_getrandom)
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#define BOOST_UUID_RANDOM_PROVIDER_HAS_GETRANDOM
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#endif // defined(SYS_getrandom)
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#endif
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// On Linux, getentropy is implemented via getrandom. If we know that getrandom is not supported by the kernel, getentropy
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// will certainly not work, even if libc provides a wrapper function for it. There is no reason, ever, to use getentropy on that platform.
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#if !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY) && (defined(__linux__) || defined(__linux) || defined(linux) || defined(__ANDROID__))
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#define BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY
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#endif
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//
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// Platform Detection - will load in the correct header and
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// will define the class <tt>random_provider_base</tt>.
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//
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#if BOOST_OS_BSD_OPEN >= BOOST_VERSION_NUMBER(2, 1, 0) || BOOST_LIB_C_CLOUDABI
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# define BOOST_UUID_RANDOM_PROVIDER_ARC4RANDOM
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# define BOOST_UUID_RANDOM_PROVIDER_NAME arc4random
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#elif BOOST_OS_WINDOWS
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# include <boost/winapi/config.hpp>
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# if BOOST_WINAPI_PARTITION_APP_SYSTEM && \
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!defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_WINCRYPT) && \
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!defined(_WIN32_WCE) && \
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(BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6)
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# define BOOST_UUID_RANDOM_PROVIDER_BCRYPT
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# define BOOST_UUID_RANDOM_PROVIDER_NAME bcrypt
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# elif BOOST_WINAPI_PARTITION_DESKTOP || BOOST_WINAPI_PARTITION_SYSTEM
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# define BOOST_UUID_RANDOM_PROVIDER_WINCRYPT
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# define BOOST_UUID_RANDOM_PROVIDER_NAME wincrypt
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# else
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# error Unable to find a suitable windows entropy provider
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# endif
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#elif defined(BOOST_UUID_RANDOM_PROVIDER_HAS_GETRANDOM) && !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_POSIX) && !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETRANDOM)
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# define BOOST_UUID_RANDOM_PROVIDER_GETRANDOM
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# define BOOST_UUID_RANDOM_PROVIDER_NAME getrandom
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#elif BOOST_LIB_C_GNU >= BOOST_VERSION_NUMBER(2, 25, 0) && !defined(BOOST_UUID_RANDOM_PROVIDER_FORCE_POSIX) && !defined(BOOST_UUID_RANDOM_PROVIDER_DISABLE_GETENTROPY)
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# define BOOST_UUID_RANDOM_PROVIDER_GETENTROPY
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# define BOOST_UUID_RANDOM_PROVIDER_NAME getentropy
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#else
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# define BOOST_UUID_RANDOM_PROVIDER_POSIX
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# define BOOST_UUID_RANDOM_PROVIDER_NAME posix
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#endif
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#define BOOST_UUID_RANDOM_PROVIDER_STRINGIFY2(X) #X
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#define BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(X) BOOST_UUID_RANDOM_PROVIDER_STRINGIFY2(X)
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#if defined(BOOST_UUID_RANDOM_PROVIDER_SHOW)
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#pragma message("BOOST_UUID_RANDOM_PROVIDER_NAME " BOOST_UUID_RANDOM_PROVIDER_STRINGIFY(BOOST_UUID_RANDOM_PROVIDER_NAME))
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#endif
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#endif // BOOST_UUID_DETAIL_RANDOM_PROVIDER_PLATFORM_DETECTION_HPP
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