69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
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#ifndef INCLUDED_C_INSERTIONSORT_H
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#define INCLUDED_C_INSERTIONSORT_H
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#ifndef INCLUDED_C_BASE_H
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#include <c_Base.h>
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#endif /*INCLUDED_C_BASE_H*/
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#ifndef INCLUDED_C_MEMORY_H
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#include <c_Memory.h>
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#endif /*INCLUDED_C_MEMORY_H*/
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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/**
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* 通用插入排序函数
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* @param base 指向待排序数组首元素的指针
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* @param num 数组中元素的个数
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* @param size 每个元素的大小（字节数）
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* @param compar 指向比较函数的指针
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*/
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C_STATIC_FORCE_INLINE
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void c_InsertionSort(void* base, c_size_t num, c_size_t size,
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int (*compar)(const void*, const void*)) {
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char* arr = (char*)base; // 强转为 char* 以便按单字节进行指针偏移
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// 分配一块临时内存，用于存放当前要插入的“哨兵”元素（temp）
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#define STACK_LIMIT 128
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char stack_buf[STACK_LIMIT];
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void* temp = NULL;
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if (size <= STACK_LIMIT) {
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temp = stack_buf;
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} else {
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temp = C_ALLOC(size);
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if (temp == NULL) return;
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}
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for (c_size_t i = 1; i < num; i++) {
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// temp = arr[i]：将当前元素复制到临时空间
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memcpy(temp, arr + (i * size), size);
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long long j = i - 1;
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// 循环条件：j >= 0 且 arr[j] > temp
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// 使用 compar(arr + (j * size), temp) > 0 来判断是否需要后移
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while (j >= 0 && compar(arr + (j * size), temp) > 0) {
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// arr[j + 1] = arr[j]：将前面的元素往后移一位
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memcpy(arr + ((j + 1) * size), arr + (j * size), size);
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j--;
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}
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// arr[j + 1] = temp：将目标元素插入到正确位置
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memcpy(arr + ((j + 1) * size), temp, size);
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}
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// Only trigger free if it was actually allocated from the heap
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if (size > STACK_LIMIT) {
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C_FREE(temp);
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}
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#undef STACK_LIMIT
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}
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#endif /*INCLUDED_C_INSERTIONSORT_H*/
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