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_