//===-- Unittests for functions from POSIX dirent.h -----------------------===//
//
// 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/__support/CPP/string_view.h"
#include "src/dirent/closedir.h"
#include "src/dirent/dirfd.h"
#include "src/dirent/opendir.h"
#include "src/dirent/readdir.h"

#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/Test.h"

#include <dirent.h>

using LlvmLibcDirentTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
using string_view = LIBC_NAMESPACE::cpp::string_view;

TEST_F(LlvmLibcDirentTest, SimpleOpenAndRead) {
  ::DIR *dir = LIBC_NAMESPACE::opendir("testdata");
  ASSERT_TRUE(dir != nullptr);
  // The file descriptors 0, 1 and 2 are reserved for standard streams.
  // So, the file descriptor for the newly opened directory should be
  // greater than 2.
  ASSERT_GT(LIBC_NAMESPACE::dirfd(dir), 2);

  struct ::dirent *file1 = nullptr, *file2 = nullptr, *dir1 = nullptr,
                  *dir2 = nullptr;
  while (true) {
    struct ::dirent *d = LIBC_NAMESPACE::readdir(dir);
    if (d == nullptr)
      break;
    if (string_view(&d->d_name[0]) == "file1.txt")
      file1 = d;
    if (string_view(&d->d_name[0]) == "file2.txt")
      file2 = d;
    if (string_view(&d->d_name[0]) == "dir1")
      dir1 = d;
    if (string_view(&d->d_name[0]) == "dir2")
      dir2 = d;
  }

  // Verify that we don't break out of the above loop in error.
  ASSERT_ERRNO_SUCCESS();

  ASSERT_TRUE(file1 != nullptr);
  ASSERT_TRUE(file2 != nullptr);
  ASSERT_TRUE(dir1 != nullptr);
  ASSERT_TRUE(dir2 != nullptr);

  ASSERT_EQ(LIBC_NAMESPACE::closedir(dir), 0);
}

TEST_F(LlvmLibcDirentTest, OpenNonExistentDir) {
  ::DIR *dir = LIBC_NAMESPACE::opendir("___xyz123__.non_existent__");
  ASSERT_TRUE(dir == nullptr);
  ASSERT_ERRNO_EQ(ENOENT);
}

TEST_F(LlvmLibcDirentTest, OpenFile) {
  ::DIR *dir = LIBC_NAMESPACE::opendir("testdata/file1.txt");
  ASSERT_TRUE(dir == nullptr);
  ASSERT_ERRNO_EQ(ENOTDIR);
}