//模拟实现memmove函数（考虑内存重叠）#include <stdio.h>#include <assert.h>#include <string.h>void * memmove(void * dst, const void * src, int count){void * ret = dst;assert(dst);assert(src);if (dst <= src || (char *)dst >= ((char *)src + count)) //正常情况不发生重叠，，从低到高{while (count–) {*(char *)dst = *(char *)src;dst = (char *)dst + 1;src = (char *)src + 1;}}else//发生重叠，从低到高{dst = (char *)dst + count – 1;src = (char *)src + count – 1;while (count–) {*(char *)dst = *(char *)src;dst = (char *)dst – 1;src = (char *)src – 1;}}return ret;}int main(){char p[] = "hello!";char *q = "world";memmove(p, q,strlen(q)+1 );printf("%s\n", p);return 0;}
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