/*
 * 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.
 */

// Common header for manipulations with files.
#ifndef BERBERIS_TESTS_TESTS_APK_JNI_FILE_H_
#define BERBERIS_TESTS_TESTS_APK_JNI_FILE_H_

#include <unistd.h>

#include <cstdio>
#include <cstdlib>

inline const char* InitTempFileTemplate() {
  // tempnam() is not recommended for use, but we only use it to get the
  // temp dir as it varies on different platforms. E.g. /tmp on Linux,
  // or /data/local/tmp on Android. The actual file creation is done by
  // the reliable mkstemp().
  char* gen_name = tempnam(/* dir */ nullptr, /* prefix */ nullptr);
  char* template_name;
  asprintf(&template_name, "%s-ndk-tests-XXXXXX", gen_name);
  free(gen_name);
  return template_name;
}

inline const char* TempFileTemplate() {
  static const char* kTemplateName = InitTempFileTemplate();
  return kTemplateName;
}

class TempFile {
 public:
  TempFile() {
    file_name_ = strdup(TempFileTemplate());
    // Altenatively we could have created a file descriptor by tmpfile() or
    // mkstemp() with the relative filename, but then there is no portable way
    // to identify the full file name.
    fd_ = mkstemp(file_name_);
    if (fd_ < 0) {
      file_ = NULL;
      return;
    }
    file_ = fdopen(fd_, "r+");
  }

  ~TempFile() {
    if (file_ != NULL) {
      fclose(file_);
    }
    unlink(file_name_);
    free(file_name_);
  }

  FILE* get() { return file_; }

  int fd() { return fd_; }

  const char* FileName() { return file_name_; }

 private:
  FILE* file_;
  char* file_name_;
  int fd_;
};

#endif  // BERBERIS_TESTS_TESTS_APK_JNI_FILE_H_