strncpy的源代码实现

#include <stdio.h>#include <stdlib.h>char* strncpy(char *dest,char *src,unsigned int n){ char *strRtn=dest; while(n && (*dest++=*src++)){ n--; } printf("n:%d/n",n); if(n) { while(--n) *dest++; } return strRtn;}int main(){ char* dest=(char*)malloc(sizeof(char)*100); char *src="helloworld!"; printf("%s/n",strncpy(dest,src,300));}