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77486a0d08
We don't actually need the va_list and other stdarg definitions in the kernel, because we actually don't use the "pure" printf interface in any kernel code at all, but we retain the snprintf declaration because the libstdc++ library still need it to be declared and extern'ed.
75 lines
1.7 KiB
C++
75 lines
1.7 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/StringBuilder.h>
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#include <AK/StringView.h>
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#include <Kernel/KBuffer.h>
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namespace Kernel {
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class KBufferBuilder {
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AK_MAKE_NONCOPYABLE(KBufferBuilder);
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public:
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using OutputType = KBuffer;
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static ErrorOr<KBufferBuilder> try_create();
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KBufferBuilder(KBufferBuilder&&) = default;
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KBufferBuilder& operator=(KBufferBuilder&&) = default;
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~KBufferBuilder() = default;
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ErrorOr<void> append(StringView);
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ErrorOr<void> append(char);
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ErrorOr<void> append(char const*, int);
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ErrorOr<void> append_escaped_for_json(StringView);
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ErrorOr<void> append_bytes(ReadonlyBytes);
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template<typename... Parameters>
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ErrorOr<void> appendff(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
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{
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// FIXME: This really not ideal, but vformat expects StringBuilder.
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StringBuilder builder;
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AK::VariadicFormatParams<AK::AllowDebugOnlyFormatters::No, Parameters...> variadic_format_params { parameters... };
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TRY(vformat(builder, fmtstr.view(), variadic_format_params));
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return 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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ReadonlyBytes bytes() const
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{
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if (!m_buffer)
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return {};
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return m_buffer->bytes();
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}
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size_t length() const
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{
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return m_size;
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}
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private:
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explicit KBufferBuilder(NonnullOwnPtr<KBuffer>);
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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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OwnPtr<KBuffer> m_buffer;
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size_t m_size { 0 };
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};
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}
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