align.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_MEMORY_ALIGN_HPP
#define TETL_MEMORY_ALIGN_HPP
 
#include <etl/_bit/bit_cast.hpp>
#include <etl/_cstddef/size_t.hpp>
#include <etl/_cstdint/uintptr_t.hpp>
 
namespace etl {

[[nodiscard]] inline auto align(etl::size_t alignment, etl::size_t size, void*& ptr, etl::size_t& space) noexcept
    -> void*
{
    auto off = static_cast<etl::size_t>(bit_cast<etl::uintptr_t>(ptr) & (alignment - 1));
    if (off != 0) {
        off = alignment - off;
    }
    if (space < off || space - off < size) {
        return nullptr;
    }
 
    ptr = static_cast<char*>(ptr) + off;
    space -= off;
    return ptr;
}
 
} // namespace etl
 
#endif // TETL_MEMORY_ALIGN_HPP