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https://github.com/SerenityOS/serenity
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2bba9411ca
We have many places in the kernel code that we have boolean flags that are only set once, and never reset again but are checked multiple times before and after the time they're being set, which matches the purpose of the SetOnce class.
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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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 <AK/Format.h>
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#include <AK/SetOnce.h>
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#include <AK/StringBuilder.h>
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#include <Kernel/Library/KString.h>
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extern SetOnce g_not_in_early_boot;
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namespace Kernel {
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ErrorOr<NonnullOwnPtr<KString>> KString::try_create(StringView 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 = TRY(KString::try_create_uninitialized(length, characters));
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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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ErrorOr<NonnullOwnPtr<KString>> KString::vformatted(StringView fmtstr, AK::TypeErasedFormatParams& params)
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{
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StringBuilder builder;
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TRY(AK::vformat(builder, fmtstr, params));
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return try_create(builder.string_view());
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}
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NonnullOwnPtr<KString> KString::must_create(StringView string)
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{
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// We can only enforce success during early boot.
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VERIFY(!g_not_in_early_boot.was_set());
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return KString::try_create(string).release_value();
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}
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ErrorOr<NonnullOwnPtr<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 ENOMEM;
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auto new_string = TRY(adopt_nonnull_own_or_enomem(new (slot) KString(length)));
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characters = new_string->m_characters;
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return new_string;
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}
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NonnullOwnPtr<KString> KString::must_create_uninitialized(size_t length, char*& characters)
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{
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// We can only enforce success during early boot.
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VERIFY(!g_not_in_early_boot.was_set());
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return KString::try_create_uninitialized(length, characters).release_value();
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}
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ErrorOr<NonnullOwnPtr<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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void KString::operator delete(void* string)
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{
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if (!string)
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return;
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size_t allocation_size = sizeof(KString) + (sizeof(char) * static_cast<KString*>(string)->m_length) + sizeof(char);
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kfree_sized(string, allocation_size);
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}
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}
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