1// Tencent is pleased to support the open source community by making RapidJSON available.
2//
3// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
4//
5// Licensed under the MIT License (the "License"); you may not use this file except
6// in compliance with the License. You may obtain a copy of the License at
7//
8// http://opensource.org/licenses/MIT
9//
10// Unless required by applicable law or agreed to in writing, software distributed
11// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12// CONDITIONS OF ANY KIND, either express or implied. See the License for the
13// specific language governing permissions and limitations under the License.
14
15#ifndef RAPIDJSON_INTERNAL_STRFUNC_H_
16#define RAPIDJSON_INTERNAL_STRFUNC_H_
17
18#include "../stream.h"
19
20RAPIDJSON_NAMESPACE_BEGIN
21namespace internal {
22
23//! Custom strlen() which works on different character types.
24/*! \tparam Ch Character type (e.g. char, wchar_t, short)
25 \param s Null-terminated input string.
26 \return Number of characters in the string.
27 \note This has the same semantics as strlen(), the return value is not number of Unicode codepoints.
28*/
29template <typename Ch>
30inline SizeType StrLen(const Ch* s) {
31 const Ch* p = s;
32 while (*p) ++p;
33 return SizeType(p - s);
34}
35
36//! Returns number of code points in a encoded string.
37template<typename Encoding>
38bool CountStringCodePoint(const typename Encoding::Ch* s, SizeType length, SizeType* outCount) {
39 GenericStringStream<Encoding> is(s);
40 const typename Encoding::Ch* end = s + length;
41 SizeType count = 0;
42 while (is.src_ < end) {
43 unsigned codepoint;
44 if (!Encoding::Decode(is, &codepoint))
45 return false;
46 count++;
47 }
48 *outCount = count;
49 return true;
50}
51
52} // namespace internal
53RAPIDJSON_NAMESPACE_END
54
55#endif // RAPIDJSON_INTERNAL_STRFUNC_H_
56