memcpy()只是memmove()的一个子集

memcpy()在执行内存重叠的情况下时，就会发生错误，而memmove()不会

void *memmove(void *dest, const void *src, size_t count)
{assert((dest!=0)&&(src!=0));unsigned char *pdest =(char * )dest;unsigned char *psrc = (char * )src;int i=0;if ((pdest < psrc) || (pdest > psrc + count)) ///正向拷贝{for (i= 0; i < count; i++) {*pdest ++ = *psrc ++;}}else      /*反向拷贝*/{psrc += count;pdest += count; for (i= 0; i < count; i++){ psrc --; pdest --; *pdest = *psrc;} }return dest;
}