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AK+Kernel: Add the FixedStringBuffer class and StdLib functions for it

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This class encapsulates a fixed Array with compile-time size definition
for storing ASCII characters.

There are also new Kernel StdLib functions to copy user data into such
objects so this class will be useful later on.
This commit is contained in:
Liav A 2023-07-17 09:20:51 +03:00 • committed by Andrew Kaster
parent 3b09560251
commit 0d30f558f4
2 changed files with 118 additions and 0 deletions
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21
Kernel/Library/StdLib.h
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -8,6 +9,7 @@
#include <AK/Checked.h>
#include <AK/Error.h>
#include <AK/FixedStringBuffer.h>
#include <AK/Forward.h>
#include <AK/Time.h>
#include <AK/Userspace.h>
@ -16,6 +18,25 @@
#include <stddef.h>
ErrorOr<NonnullOwnPtr<Kernel::KString>> try_copy_kstring_from_user(Userspace<char const*>, size_t);
template<size_t Size>
ErrorOr<void> try_copy_string_from_user_into_fixed_string_buffer(Userspace<char const*> user_str, FixedStringBuffer<Size>& buffer, size_t user_str_size)
{
if (user_str_size > Size)
return E2BIG;
TRY(buffer.copy_characters_from_user(user_str, user_str_size));
return {};
}
template<size_t Size>
ErrorOr<void> try_copy_name_from_user_into_fixed_string_buffer(Userspace<char const*> user_str, FixedStringBuffer<Size>& buffer, size_t user_str_size)
{
if (user_str_size > Size)
return ENAMETOOLONG;
TRY(buffer.copy_characters_from_user(user_str, user_str_size));
return {};
}
ErrorOr<Duration> copy_time_from_user(timespec const*);
ErrorOr<Duration> copy_time_from_user(timeval const*);
template<typename T>