//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// test <cstdlib>

#include <cstdlib>
#include <type_traits>
#include <cassert>

#include "test_macros.h"

// As of 1/10/2015 clang emits a -Wnonnull warnings even if the warning occurs
// in an unevaluated context. For this reason we manually suppress the warning.
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wnonnull"
#endif

#ifndef EXIT_FAILURE
#error EXIT_FAILURE not defined
#endif

#ifndef EXIT_SUCCESS
#error EXIT_SUCCESS not defined
#endif

#ifndef MB_CUR_MAX
#error MB_CUR_MAX not defined
#endif

#ifndef NULL
#error NULL not defined
#endif

#ifndef RAND_MAX
#error RAND_MAX not defined
#endif

template <class TestType, class IntType>
void test_div_struct() {
    TestType obj;
    static_assert(sizeof(obj) >= sizeof(IntType) * 2, ""); // >= to account for alignment.
    static_assert((std::is_same<decltype(obj.quot), IntType>::value), "");
    static_assert((std::is_same<decltype(obj.rem), IntType>::value), "");
    ((void) obj);
};

template <class T, class = decltype(std::abs(std::declval<T>()))>
std::true_type has_abs_imp(int);
template <class T>
std::false_type has_abs_imp(...);

template <class T>
struct has_abs : decltype(has_abs_imp<T>(0)) {};

void test_abs() {
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wabsolute-value"
#endif
    static_assert((std::is_same<decltype(std::abs((float)0)), float>::value), "");
    static_assert((std::is_same<decltype(std::abs((double)0)), double>::value), "");
    static_assert(
        (std::is_same<decltype(std::abs((long double)0)), long double>::value), "");
    static_assert((std::is_same<decltype(std::abs((int)0)), int>::value), "");
    static_assert((std::is_same<decltype(std::abs((long)0)), long>::value), "");
    static_assert((std::is_same<decltype(std::abs((long long)0)), long long>::value),
                  "");
    static_assert((std::is_same<decltype(std::abs((unsigned char)0)), int>::value),
                  "");
    static_assert((std::is_same<decltype(std::abs((unsigned short)0)), int>::value),
                  "");
    static_assert((std::is_same<decltype(std::abs((signed char)0)), int>::value),
                  "");
    static_assert((std::is_same<decltype(std::abs((short)0)), int>::value),
                  "");
    static_assert((std::is_same<decltype(std::abs((unsigned char)0)), int>::value),
                  "");
    static_assert((std::is_same<decltype(std::abs((char)0)), int>::value),
                  "");

    static_assert(!has_abs<unsigned>::value, "");
    static_assert(!has_abs<unsigned long>::value, "");
    static_assert(!has_abs<unsigned long long>::value, "");
    static_assert(!has_abs<size_t>::value, "");

#ifdef __clang__
#pragma clang diagnostic pop
#endif

    assert(std::abs(-1.) == 1);
}

int main(int, char**)
{
    std::size_t s = 0;
    ((void)s);
    static_assert((std::is_same<std::size_t, decltype(sizeof(int))>::value), "");
    test_div_struct<std::div_t, int>();
    test_div_struct<std::ldiv_t, long>();
    test_div_struct<std::lldiv_t, long long>();
    char** endptr = 0;
    static_assert((std::is_same<decltype(std::atof("")), double>::value), "");
    static_assert((std::is_same<decltype(std::atoi("")), int>::value), "");
    static_assert((std::is_same<decltype(std::atol("")), long>::value), "");
    static_assert((std::is_same<decltype(std::atoll("")), long long>::value), "");
    static_assert((std::is_same<decltype(std::getenv("")), char*>::value), "");
    static_assert((std::is_same<decltype(std::strtod("", endptr)), double>::value), "");
    static_assert((std::is_same<decltype(std::strtof("", endptr)), float>::value), "");
    static_assert((std::is_same<decltype(std::strtold("", endptr)), long double>::value), "");
    static_assert((std::is_same<decltype(std::strtol("", endptr,0)), long>::value), "");
    static_assert((std::is_same<decltype(std::strtoll("", endptr,0)), long long>::value), "");
    static_assert((std::is_same<decltype(std::strtoul("", endptr,0)), unsigned long>::value), "");
    static_assert((std::is_same<decltype(std::strtoull("", endptr,0)), unsigned long long>::value), "");
    static_assert((std::is_same<decltype(std::rand()), int>::value), "");
    static_assert((std::is_same<decltype(std::srand(0)), void>::value), "");

//  Microsoft does not implement aligned_alloc in their C library
#if TEST_STD_VER > 14 && defined(TEST_HAS_C11_FEATURES) && !defined(_WIN32)
    static_assert((std::is_same<decltype(aligned_alloc(0,0)), void*>::value), "");
#endif

    static_assert((std::is_same<decltype(std::calloc(0,0)), void*>::value), "");
    static_assert((std::is_same<decltype(std::free(0)), void>::value), "");
    static_assert((std::is_same<decltype(std::malloc(0)), void*>::value), "");
    static_assert((std::is_same<decltype(std::realloc(0,0)), void*>::value), "");
    static_assert((std::is_same<decltype(std::abort()), void>::value), "");
    static_assert((std::is_same<decltype(std::atexit(0)), int>::value), "");
    static_assert((std::is_same<decltype(std::exit(0)), void>::value), "");
    static_assert((std::is_same<decltype(std::_Exit(0)), void>::value), "");
    static_assert((std::is_same<decltype(std::getenv("")), char*>::value), "");
    static_assert((std::is_same<decltype(std::system("")), int>::value), "");
    static_assert((std::is_same<decltype(std::bsearch(0,0,0,0,0)), void*>::value), "");
    static_assert((std::is_same<decltype(std::qsort(0,0,0,0)), void>::value), "");
    static_assert((std::is_same<decltype(std::abs(0)), int>::value), "");
    static_assert((std::is_same<decltype(std::abs((long)0)), long>::value), "");
    static_assert((std::is_same<decltype(std::abs((long long)0)), long long>::value), "");
    static_assert((std::is_same<decltype(std::labs((long)0)), long>::value), "");
    static_assert((std::is_same<decltype(std::llabs((long long)0)), long long>::value), "");
    static_assert((std::is_same<decltype(std::div(0,0)), std::div_t>::value), "");
    static_assert((std::is_same<decltype(std::div(0L,0L)), std::ldiv_t>::value), "");
    static_assert((std::is_same<decltype(std::div(0LL,0LL)), std::lldiv_t>::value), "");
    static_assert((std::is_same<decltype(std::ldiv(0L,0L)), std::ldiv_t>::value), "");
    static_assert((std::is_same<decltype(std::lldiv(0LL,0LL)), std::lldiv_t>::value), "");
    wchar_t* pw = 0;
    const wchar_t* pwc = 0;
    char* pc = 0;
    static_assert((std::is_same<decltype(std::mblen("",0)), int>::value), "");
    static_assert((std::is_same<decltype(std::mbtowc(pw,"",0)), int>::value), "");
    static_assert((std::is_same<decltype(std::wctomb(pc,L' ')), int>::value), "");
    static_assert((std::is_same<decltype(std::mbstowcs(pw,"",0)), std::size_t>::value), "");
    static_assert((std::is_same<decltype(std::wcstombs(pc,pwc,0)), std::size_t>::value), "");

    test_abs();

    return 0;
}
