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//===-- Unittests for rand ------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "src/stdlib/rand.h"
#include "src/stdlib/srand.h"
#include "test/UnitTest/Test.h"
#include <stddef.h>
TEST(LlvmLibcRandTest, UnsetSeed) {
static int vals[1000];
for (size_t i = 0; i < 1000; ++i) {
int val = LIBC_NAMESPACE::rand();
ASSERT_GE(val, 0);
ASSERT_LE(val, RAND_MAX);
vals[i] = val;
}
// The C standard specifies that if 'srand' is never called it should behave
// as if 'srand' was called with a value of 1. If we seed the value with 1 we
// should get the same sequence as the unseeded version.
LIBC_NAMESPACE::srand(1);
for (size_t i = 0; i < 1000; ++i)
ASSERT_EQ(LIBC_NAMESPACE::rand(), vals[i]);
}
TEST(LlvmLibcRandTest, SetSeed) {
const unsigned int SEED = 12344321;
LIBC_NAMESPACE::srand(SEED);
const size_t NUM_RESULTS = 10;
int results[NUM_RESULTS];
for (size_t i = 0; i < NUM_RESULTS; ++i) {
results[i] = LIBC_NAMESPACE::rand();
ASSERT_GE(results[i], 0);
ASSERT_LE(results[i], RAND_MAX);
}
// If the seed is set to the same value, it should give the same sequence.
LIBC_NAMESPACE::srand(SEED);
for (size_t i = 0; i < NUM_RESULTS; ++i) {
int val = LIBC_NAMESPACE::rand();
EXPECT_EQ(results[i], val);
}
}
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