48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
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#ifndef INCLUDED_C_SWAP_H
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#define INCLUDED_C_SWAP_H
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#ifndef INCLUDED_C_TYPES_H
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#include <c_Types.h>
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#endif /*INCLUDED_C_TYPES_H*/
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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/**
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* @brief 泛型就地内存块数据互换接口
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*
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* @param a 指向第一个待交换对象的泛型指针
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* @param b 指向第二个待交换对象的泛型指针
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* @param size 待交换对象占用的内存字节大小 (sizeof)
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*/
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C_STATIC_FORCE_INLINE
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void c_Swap(void* a, void* b, c_size_t size) {
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// 边界与自等性防御：指针无效、长度为0、或者两个指针指向同一个内存物理地址时无需交换
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if (!a || !b || size == 0 || a == b) {
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return;
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}
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char* p1 = (char*)a;
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char* p2 = (char*)b;
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// 在栈上开辟一个小缓冲区。256 字节足以一次性吃下绝大多数基本类型和中小型结构体
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char temp_buf[256];
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c_size_t bytes_left = size;
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// 分块拷贝机制：无视对象体量，即便面临超出 256 字节的巨型结构体也能安全互换
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while (bytes_left > 0) {
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const c_size_t chunk = (bytes_left < sizeof(temp_buf)) ? bytes_left : sizeof(temp_buf);
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memcpy(temp_buf, p1, chunk);
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memcpy(p1, p2, chunk);
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memcpy(p2, temp_buf, chunk);
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p1 += chunk;
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p2 += chunk;
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bytes_left -= chunk;
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}
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}
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#endif /*INCLUDED_C_SWAP_H*/
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