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Kernel: Add KString, a single-owner string with OOM failure exposion
This is a simple string class for use in the kernel. It encapsulates a length + character array in a single-allocation object. Main differences from AK::String: - Single-owner (no reference counting.) - Allocation failures are exposed, not hidden. The basic idea is to allow better and more precise string management in the kernel.
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3 changed files with 89 additions and 0 deletions
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@ -112,6 +112,7 @@ set(KERNEL_SOURCES
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Interrupts/SpuriousInterruptHandler.cpp
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Interrupts/UnhandledInterruptHandler.cpp
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KBufferBuilder.cpp
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KString.cpp
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KSyms.cpp
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Lock.cpp
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Net/E1000NetworkAdapter.cpp
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40
Kernel/KString.cpp
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40
Kernel/KString.cpp
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@ -0,0 +1,40 @@
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/*
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* Copyright (c) 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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#include <Kernel/KString.h>
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namespace Kernel {
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OwnPtr<KString> KString::try_create(StringView const& string)
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{
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char* characters = nullptr;
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size_t length = string.length();
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auto new_string = KString::try_create_uninitialized(length, characters);
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if (!new_string)
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return {};
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if (!string.is_empty())
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__builtin_memcpy(characters, string.characters_without_null_termination(), length);
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characters[length] = '\0';
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return new_string;
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}
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OwnPtr<KString> KString::try_create_uninitialized(size_t length, char*& characters)
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{
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size_t allocation_size = sizeof(KString) + (sizeof(char) * length) + sizeof(char);
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auto* slot = kmalloc(allocation_size);
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if (!slot)
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return {};
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auto* new_string = new (slot) KString(length);
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characters = new_string->m_characters;
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return adopt_own(*new_string);
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}
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OwnPtr<KString> KString::try_clone() const
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{
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return try_create(view());
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}
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}
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48
Kernel/KString.h
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48
Kernel/KString.h
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@ -0,0 +1,48 @@
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/*
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* Copyright (c) 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/Format.h>
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#include <AK/OwnPtr.h>
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namespace Kernel {
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class KString {
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public:
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static OwnPtr<KString> try_create_uninitialized(size_t, char*&);
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static OwnPtr<KString> try_create(StringView const&);
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OwnPtr<KString> try_clone() const;
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bool is_empty() const { return m_length == 0; }
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size_t length() const { return m_length; }
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char const* characters() const { return m_characters; }
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StringView view() const { return { characters(), length() }; }
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private:
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explicit KString(size_t length)
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: m_length(length)
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{
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}
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size_t m_length { 0 };
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char m_characters[0];
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};
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}
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namespace AK {
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template<>
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struct Formatter<Kernel::KString> : Formatter<StringView> {
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void format(FormatBuilder& builder, Kernel::KString const& value)
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{
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Formatter<StringView>::format(builder, value.characters());
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}
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};
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}
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