/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <ftw.h>

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "TemporaryFile.h"

#include <gtest/gtest.h>

static void MakeTree(const char* root) {
  char path[PATH_MAX];

  snprintf(path, sizeof(path), "%s/dir", root);
  ASSERT_EQ(0, mkdir(path, 0555));
  snprintf(path, sizeof(path), "%s/dir/sub", root);
  ASSERT_EQ(0, mkdir(path, 0555));
  snprintf(path, sizeof(path), "%s/unreadable-dir", root);
  ASSERT_EQ(0, mkdir(path, 0000));

  snprintf(path, sizeof(path), "%s/dangler", root);
  ASSERT_EQ(0, symlink("/does-not-exist", path));
  snprintf(path, sizeof(path), "%s/symlink", root);
  ASSERT_EQ(0, symlink("sub2", path));

  int fd;
  snprintf(path, sizeof(path), "%s/regular", root);
  ASSERT_NE(-1, fd = open(path, O_CREAT|O_TRUNC, 0666));
  ASSERT_EQ(0, close(fd));
}

void sanity_check_ftw(const char* fpath, const struct stat* sb, int tflag) {
  ASSERT_TRUE(fpath != NULL);
  ASSERT_TRUE(sb != NULL);

  if (S_ISDIR(sb->st_mode)) {
    EXPECT_TRUE(tflag == FTW_D || tflag == FTW_DNR || tflag == FTW_DP) << fpath;
  } else if (S_ISLNK(sb->st_mode)) {
    EXPECT_EQ(FTW_SL, tflag) << fpath;
  } else {
    EXPECT_EQ(FTW_F, tflag) << fpath;
  }
}

void sanity_check_nftw(const char* fpath, const struct stat* sb, int tflag, struct FTW* ftwbuf) {
  sanity_check_ftw(fpath, sb, tflag);
  ASSERT_EQ('/', fpath[ftwbuf->base - 1]) << fpath;
}

int check_ftw(const char* fpath, const struct stat* sb, int tflag) {
  sanity_check_ftw(fpath, sb, tflag);
  return 0;
}

int check_ftw64(const char* fpath, const struct stat64* sb, int tflag) {
  sanity_check_ftw(fpath, reinterpret_cast<const struct stat*>(sb), tflag);
  return 0;
}

int check_nftw(const char* fpath, const struct stat* sb, int tflag, struct FTW* ftwbuf) {
  sanity_check_nftw(fpath, sb, tflag, ftwbuf);
  return 0;
}

int check_nftw64(const char* fpath, const struct stat64* sb, int tflag, struct FTW* ftwbuf) {
  sanity_check_nftw(fpath, reinterpret_cast<const struct stat*>(sb), tflag, ftwbuf);
  return 0;
}

TEST(ftw, ftw) {
  TemporaryDir root;
  MakeTree(root.dirname);
  ASSERT_EQ(0, ftw(root.dirname, check_ftw, 128));
}

TEST(ftw, ftw64) {
  TemporaryDir root;
  MakeTree(root.dirname);
  ASSERT_EQ(0, ftw64(root.dirname, check_ftw64, 128));
}

TEST(ftw, nftw) {
  TemporaryDir root;
  MakeTree(root.dirname);
  ASSERT_EQ(0, nftw(root.dirname, check_nftw, 128, 0));
}

TEST(ftw, nftw64) {
  TemporaryDir root;
  MakeTree(root.dirname);
  ASSERT_EQ(0, nftw64(root.dirname, check_nftw64, 128, 0));
}