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AK+Kernel: Introduce StdLib function to copy FixedStringBuffer to user

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This new Kernel StdLib function will be used to copy contents of a
FixedStringBuffer with a null character to a user process.

The first user of this new function is the prctl option of
PR_GET_PROCESS_NAME which would copy a process name including a null
character to a user provided buffer.
This commit is contained in:
Liav A 2023-08-23 21:10:02 +03:00 • committed by Tim Schumacher
parent 6cb88e224e
commit 72231b405a
3 changed files with 19 additions and 5 deletions
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7
AK/FixedStringBuffer.h
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@ -95,8 +95,13 @@ public:
return m_storage.span();
}
StringView representable_view() const { return StringView(m_storage.data(), m_stored_length); }
Span<u8 const> span_view_ensuring_ending_null_char()
{
VERIFY(m_stored_length + 1 <= Size);
m_storage[m_stored_length] = '\0';
return Span<u8 const>(m_storage.data(), m_stored_length + 1);
}
size_t fixed_length() const { return Size; }
size_t stored_length() const { return m_stored_length; }
FixedStringBuffer()