strfunc.h
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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
20 RAPIDJSON_NAMESPACE_BEGIN
21 namespace 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 */
29 template <typename Ch>
30 inline 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.
37 template<typename Encoding>
38 bool 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
53 RAPIDJSON_NAMESPACE_END
54
55 #endif // RAPIDJSON_INTERNAL_STRFUNC_H_
rapidjson::SizeType
unsigned SizeType
Size type (for string lengths, array sizes, etc.)
Definition: rapidjson.h:380