135 lines
3.7 KiB
C++
135 lines
3.7 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include <errno.h>
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#include <libgen.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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TEST(stdlib, drand48) {
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srand48(0x01020304);
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EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
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EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
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EXPECT_DOUBLE_EQ(0.42015087072844537, drand48());
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EXPECT_DOUBLE_EQ(0.061637783047395089, drand48());
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}
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TEST(stdlib, lrand48_random_rand) {
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srand48(0x01020304);
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EXPECT_EQ(1409163720, lrand48());
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EXPECT_EQ(397769746, lrand48());
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EXPECT_EQ(902267124, lrand48());
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EXPECT_EQ(132366131, lrand48());
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#if __BIONIC__
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// On bionic, random(3) is equivalent to lrand48...
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srandom(0x01020304);
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EXPECT_EQ(1409163720, random());
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EXPECT_EQ(397769746, random());
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EXPECT_EQ(902267124, random());
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EXPECT_EQ(132366131, random());
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// ...and rand(3) is the bottom 32 bits.
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srand(0x01020304);
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EXPECT_EQ(static_cast<int>(1409163720), rand());
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EXPECT_EQ(static_cast<int>(397769746), rand());
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EXPECT_EQ(static_cast<int>(902267124), rand());
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EXPECT_EQ(static_cast<int>(132366131), rand());
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#endif
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}
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TEST(stdlib, mrand48) {
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srand48(0x01020304);
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EXPECT_EQ(-1476639856, mrand48());
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EXPECT_EQ(795539493, mrand48());
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EXPECT_EQ(1804534249, mrand48());
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EXPECT_EQ(264732262, mrand48());
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}
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TEST(stdlib, posix_memalign) {
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void* p;
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ASSERT_EQ(0, posix_memalign(&p, 512, 128));
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ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(p) % 512);
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free(p);
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// Can't align to a non-power of 2.
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ASSERT_EQ(EINVAL, posix_memalign(&p, 81, 128));
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}
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TEST(stdlib, realpath__NULL_filename) {
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errno = 0;
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char* p = realpath(NULL, NULL);
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ASSERT_TRUE(p == NULL);
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ASSERT_EQ(EINVAL, errno);
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}
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TEST(stdlib, realpath__empty_filename) {
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errno = 0;
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char* p = realpath("", NULL);
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ASSERT_TRUE(p == NULL);
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ASSERT_EQ(ENOENT, errno);
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}
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TEST(stdlib, realpath__ENOENT) {
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errno = 0;
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char* p = realpath("/this/directory/path/almost/certainly/does/not/exist", NULL);
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ASSERT_TRUE(p == NULL);
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ASSERT_EQ(ENOENT, errno);
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}
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TEST(stdlib, realpath) {
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// Get the name of this executable.
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char executable_path[PATH_MAX];
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int rc = readlink("/proc/self/exe", executable_path, sizeof(executable_path));
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ASSERT_NE(rc, -1);
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executable_path[rc] = '\0';
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char buf[PATH_MAX + 1];
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char* p = realpath("/proc/self/exe", buf);
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ASSERT_STREQ(executable_path, p);
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p = realpath("/proc/self/exe", NULL);
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ASSERT_STREQ(executable_path, p);
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free(p);
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}
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TEST(stdlib, qsort) {
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struct s {
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char name[16];
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static int comparator(const void* lhs, const void* rhs) {
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return strcmp(reinterpret_cast<const s*>(lhs)->name, reinterpret_cast<const s*>(rhs)->name);
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}
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};
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s entries[3];
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strcpy(entries[0].name, "charlie");
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strcpy(entries[1].name, "bravo");
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strcpy(entries[2].name, "alpha");
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qsort(entries, 3, sizeof(s), s::comparator);
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ASSERT_STREQ("alpha", entries[0].name);
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ASSERT_STREQ("bravo", entries[1].name);
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ASSERT_STREQ("charlie", entries[2].name);
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qsort(entries, 3, sizeof(s), s::comparator);
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ASSERT_STREQ("alpha", entries[0].name);
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ASSERT_STREQ("bravo", entries[1].name);
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ASSERT_STREQ("charlie", entries[2].name);
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}
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