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e5497a326a
StringBuilder::appendf was already used, thus this name. If we some day replace all usages of printf, we could rename this method.
89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/UserOrKernelBuffer.h>
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#include <Kernel/VM/MemoryManager.h>
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namespace Kernel {
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bool UserOrKernelBuffer::is_kernel_buffer() const
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{
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return !is_user_address(VirtualAddress(m_buffer));
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}
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String UserOrKernelBuffer::copy_into_string(size_t size) const
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{
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if (!m_buffer)
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return {};
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if (is_user_address(VirtualAddress(m_buffer))) {
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char* buffer;
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auto data_copy = StringImpl::create_uninitialized(size, buffer);
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if (!copy_from_user(buffer, m_buffer, size))
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return {};
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return data_copy;
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}
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return String(ReadonlyBytes { m_buffer, size });
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}
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bool UserOrKernelBuffer::write(const void* src, size_t offset, size_t len)
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{
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if (!m_buffer)
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return false;
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if (is_user_address(VirtualAddress(m_buffer)))
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return copy_to_user(m_buffer + offset, src, len);
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memcpy(m_buffer + offset, src, len);
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return true;
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}
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bool UserOrKernelBuffer::read(void* dest, size_t offset, size_t len) const
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{
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if (!m_buffer)
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return false;
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if (is_user_address(VirtualAddress(m_buffer)))
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return copy_from_user(dest, m_buffer + offset, len);
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memcpy(dest, m_buffer + offset, len);
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return true;
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}
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bool UserOrKernelBuffer::memset(int value, size_t offset, size_t len)
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{
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if (!m_buffer)
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return false;
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if (is_user_address(VirtualAddress(m_buffer)))
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return memset_user(m_buffer + offset, value, len);
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::memset(m_buffer + offset, value, len);
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return true;
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}
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}
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