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103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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 <AK/Assertions.h>
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#include <AK/QuickSort.h>
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#include <stdlib.h>
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#include <sys/types.h>
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class SizedObject {
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public:
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SizedObject() = delete;
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SizedObject(void* data, size_t size)
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: m_data(data)
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, m_size(size)
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{
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}
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void* data() const { return m_data; }
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size_t size() const { return m_size; }
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private:
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void* m_data;
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size_t m_size;
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};
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namespace AK {
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template<>
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inline void swap(const SizedObject& a, const SizedObject& b)
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{
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ASSERT(a.size() == b.size());
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const size_t size = a.size();
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const auto a_data = reinterpret_cast<char*>(a.data());
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const auto b_data = reinterpret_cast<char*>(b.data());
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for (auto i = 0u; i < size; ++i) {
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swap(a_data[i], b_data[i]);
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}
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}
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}
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class SizedObjectSlice {
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public:
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SizedObjectSlice() = delete;
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SizedObjectSlice(void* data, size_t element_size)
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: m_data(data)
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, m_element_size(element_size)
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{
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}
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const SizedObject operator[](size_t index)
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{
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return { static_cast<char*>(m_data) + index * m_element_size, m_element_size };
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}
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private:
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void* m_data;
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size_t m_element_size;
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};
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void qsort(void* bot, size_t nmemb, size_t size, int (*compar)(const void*, const void*))
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{
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if (nmemb <= 1) {
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return;
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}
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SizedObjectSlice slice { bot, size };
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AK::dual_pivot_quick_sort(slice, 0, nmemb - 1, [=](const SizedObject& a, const SizedObject& b) { return compar(a.data(), b.data()) < 0; });
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}
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void qsort_r(void* bot, size_t nmemb, size_t size, int (*compar)(const void*, const void*, void*), void* arg)
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{
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if (nmemb <= 1) {
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return;
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}
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SizedObjectSlice slice { bot, size };
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AK::dual_pivot_quick_sort(slice, 0, nmemb - 1, [=](const SizedObject& a, const SizedObject& b) { return compar(a.data(), b.data(), arg) < 0; });
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}
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