starboard/shared/starboard/lcpy.h

// Copyright 2015 The Cobalt 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.

// Some private implementation utility functions to make string copying fun. May
// be used by any Starboard implementation.

#ifndef STARBOARD_SHARED_STARBOARD_LCPY_H_
#define STARBOARD_SHARED_STARBOARD_LCPY_H_

#include "starboard/shared/internal_only.h"
#include "starboard/types.h"

#if SB_API_VERSION < 13

namespace starboard {
namespace shared {
namespace starboard {

template <typename CHAR>
int lcpyT(CHAR* dst, const CHAR* src, int dst_size) {
  for (int i = 0; i < dst_size; ++i) {
    if ((dst[i] = src[i]) == 0)  // We hit and copied the terminating NULL.
      return i;
  }

  // We were left off at dst_size.  We over copied 1 byte.  Null terminate.
  if (dst_size != 0)
    dst[dst_size - 1] = 0;

  // Count the rest of the |src|, and return its length in characters.
  while (src[dst_size])
    ++dst_size;
  return dst_size;
}

}  // namespace starboard
}  // namespace shared
}  // namespace starboard

#endif  // SB_API_VERSION < 13

#endif  // STARBOARD_SHARED_STARBOARD_LCPY_H_