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https://github.com/LadybirdBrowser/ladybird.git
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93c3b6bdd2
This avoids some of the the shortest-lived allocations in the kernel: StringImpl::create_uninitialized(unsigned long, char*&) StringImpl::create(char const*, unsigned long, ShouldChomp) StringBuilder::to_string() const String::vformatted(StringView, TypeErasedFormatParams) void Kernel::KBufferBuilder::appendff<unsigned int>(...) JsonObjectSerializer<Kernel::KBufferBuilder>::add(..., unsigned int) Kernel::procfs$all(Kernel::InodeIdentifier, ...) const Kernel::procfs$all(Kernel::InodeIdentifier, Kernel::KBufferBuilder&)
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/String.h>
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#include <Kernel/KBuffer.h>
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#include <stdarg.h>
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namespace Kernel {
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class KBufferBuilder {
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public:
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using OutputType = KBuffer;
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explicit KBufferBuilder(bool can_expand = false);
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explicit KBufferBuilder(RefPtr<KBufferImpl>&, bool can_expand = false);
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KBufferBuilder(KBufferBuilder&&) = default;
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~KBufferBuilder() = default;
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void append(const StringView&);
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void append(char);
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void append(const char*, int);
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void append_escaped_for_json(const StringView&);
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void append_bytes(ReadonlyBytes);
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template<typename... Parameters>
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void appendff(CheckedFormatString<Parameters...>&& fmtstr, const Parameters&... parameters)
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{
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// FIXME: This is really not the way to go about it, but vformat expects a
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// StringBuilder. Why does this class exist anyways?
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StringBuilder builder;
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vformat(builder, fmtstr.view(), AK::VariadicFormatParams { parameters... });
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append_bytes(builder.string_view().bytes());
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}
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bool flush();
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OwnPtr<KBuffer> build();
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private:
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bool check_expand(size_t);
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u8* insertion_ptr()
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{
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if (!m_buffer)
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return nullptr;
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return m_buffer->data() + m_size;
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}
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RefPtr<KBufferImpl> m_buffer;
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size_t m_size { 0 };
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bool m_can_expand { false };
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};
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}
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