/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.

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 "tensorflow/stream_executor/lib/path.h"
#include "tensorflow/stream_executor/lib/strcat.h"

namespace stream_executor {
namespace port {
namespace internal {

static bool IsAbsolutePath(port::StringPiece path) {
  return !path.empty() && path[0] == '/';
}

// For an array of paths of length count, append them all together,
// ensuring that the proper path separators are inserted between them.
string JoinPathImpl(std::initializer_list<port::StringPiece> paths) {
  string result;

  for (port::StringPiece path : paths) {
    if (path.empty()) continue;

    if (result.empty()) {
      result = std::string(path);
      continue;
    }

    if (result[result.size() - 1] == '/') {
      if (IsAbsolutePath(path)) {
        StrAppend(&result, path.substr(1));
      } else {
        StrAppend(&result, path);
      }
    } else {
      if (IsAbsolutePath(path)) {
        StrAppend(&result, path);
      } else {
        StrAppend(&result, "/", path);
      }
    }
  }

  return result;
}

}  // namespace internal
}  // namespace port
}  // namespace stream_executor
