strfunc.h

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// Tencent is pleased to support the open source community by making RapidJSON available.
//
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
//
// Licensed under the MIT License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// http://opensource.org/licenses/MIT
//
// 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.

#ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
#define RAPIDJSON_INTERNAL_STRFUNC_H_

#include "../stream.h"
#include <cwchar>

RAPIDJSON_NAMESPACE_BEGIN
namespace internal
{

template <typename Ch>
inline SizeType StrLen(const Ch* s)
{
  RAPIDJSON_ASSERT(s != 0);
  const Ch* p = s;
  while (*p)
    ++p;
  return SizeType(p - s);
}

template <>
inline SizeType StrLen(const char* s)
{
  return SizeType(std::strlen(s));
}

template <>
inline SizeType StrLen(const wchar_t* s)
{
  return SizeType(std::wcslen(s));
}

template <typename Encoding>
bool CountStringCodePoint(const typename Encoding::Ch* s, SizeType length, SizeType* outCount)
{
  RAPIDJSON_ASSERT(s != 0);
  RAPIDJSON_ASSERT(outCount != 0);
  GenericStringStream<Encoding> is(s);
  const typename Encoding::Ch* end = s + length;
  SizeType count = 0;
  while (is.src_ < end)
  {
    unsigned codepoint;
    if (!Encoding::Decode(is, &codepoint))
      return false;
    count++;
  }
  *outCount = count;
  return true;
}

}  // namespace internal
RAPIDJSON_NAMESPACE_END

#endif  // RAPIDJSON_INTERNAL_STRFUNC_H_