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1  memmove函数的实现

#include 
   
    #include 
    
     void* my_memmove(void*dest, const void*src, size_t len)  {       char *pdest = (char *)dest;      const char* psrc = (char *)src;      if ((psrc < pdest) && (pdest < psrc + len))      { 		pdest = pdest + len - 1;		psrc = psrc + len - 1;        while (len--)          {			printf("*pstr is %c and *pdest is %c\n", *psrc, *pdest);            *pdest-- = *psrc--;          }      }      else      {          while (len--)          {              *pdest++ = *psrc++;          }      }      return dest;  }  int main(){	char s1[10] = "chenyu";	printf("dest is %s\n", s1);	printf("src is %s\n", s1 - 3);	memmove(s1, s1 - 3, 6);	printf("s1 is %s\n", s1 + 3);	char s2[10] = "chenyu";	my_memmove(s2, s2 - 3, 6);	printf("s2 is %s\n", s2 + 3
    
   

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