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These are formatters that can only be used with debug print
functions, such as dbgln(). Currently this is limited to
Formatter<ErrorOr<T>>. With this you can still debug log ErrorOr
values (good for debugging), but trying to use them in any
String::formatted() call will fail (which prevents .to_string()
errors with the new failable strings being ignored).
You make a formatter debug only by adding a constexpr method like:
static constexpr bool is_debug_only() { return true; }
76 lines
1.8 KiB
C++
76 lines
1.8 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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#include <stdarg.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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