/*
 * Copyright (C) 2013 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 <fcntl.h>
#include <unistd.h>

template<int (*mk_fn)(char*)>
class GenericTemporaryFile {
 public:
  GenericTemporaryFile(const char* dirpath = NULL) {
    if (dirpath != NULL) {
      init(dirpath);
    } else {
      // Since we might be running on the host or the target, and if we're
      // running on the host we might be running under bionic or glibc,
      // let's just try both possible temporary directories and take the
      // first one that works.
      init("/data/local/tmp");
      if (fd == -1) {
        init("/tmp");
      }
    }
  }

  ~GenericTemporaryFile() {
    close(fd);
    unlink(filename);
  }

  void reopen() {
    close(fd);
    fd = open(filename, O_RDWR);
  }

  int fd;
  char filename[1024];

 private:
  void init(const char* tmp_dir) {
    snprintf(filename, sizeof(filename), "%s/TemporaryFile-XXXXXX", tmp_dir);
    fd = mk_fn(filename);
  }
};

typedef GenericTemporaryFile<mkstemp> TemporaryFile;

class TemporaryDir {
 public:
  TemporaryDir() {
    if (!init("/data/local/tmp")) {
      init("/tmp");
    }
  }

  ~TemporaryDir() {
    rmdir(dirname);
  }

  char dirname[1024];

 private:
  bool init(const char* tmp_dir) {
    snprintf(dirname, sizeof(dirname), "%s/TemporaryDir-XXXXXX", tmp_dir);
    return (mkdtemp(dirname) != NULL);
  }

};