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/*
* Copyright (C) 2019 The Android Open Source Project
*
* 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.
*/
#ifndef SRC_TRACE_PROCESSOR_NULL_TERM_STRING_VIEW_H_
#define SRC_TRACE_PROCESSOR_NULL_TERM_STRING_VIEW_H_
#include "perfetto/base/string_view.h"
namespace perfetto {
namespace trace_processor {
// A string-like object that refers to a non-owned piece of memory which is
// null terminated.
class NullTermStringView : public base::StringView {
public:
// Creates an empty view.
NullTermStringView() : StringView() {}
// Make the view copy constructible.
NullTermStringView(const NullTermStringView&) = default;
NullTermStringView& operator=(const NullTermStringView&) = default;
// Creates a NullTermStringView from a null-terminated C string.
// Deliberately not "explicit".
NullTermStringView(const char* cstr) : StringView(cstr) {}
// Creates a NullTermStringView from a null terminated C-string where the
// size is known. This allows a call to strlen() to be avoided.
// Note: This string MUST be null terminated i.e. data[size] == '\0' MUST hold
// for this constructor to be valid.
NullTermStringView(const char* data, size_t size) : StringView(data, size) {
PERFETTO_DCHECK(data[size] == '\0');
}
// This instead has to be explicit, as creating a NullTermStringView out of a
// std::string can be subtle.
explicit NullTermStringView(const std::string& str) : StringView(str) {}
// Returns the null terminated C-string backing this string view. The same
// pointer as |data()| is returned.
const char* c_str() const { return data(); }
};
} // namespace trace_processor
} // namespace perfetto
#endif // SRC_TRACE_PROCESSOR_NULL_TERM_STRING_VIEW_H_
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