strncpy用法

strncpy

char * strncpy ( char * destination, const char * source, size_t num );

Copy characters from string

最多只复制source字符串中前num个字符. 如果在这之前遇到'\0',则在destination字符串剩下字节全部补'\0'，直到num个字节.

当source字符串的长度大于或等于num时，不会对destination补'\0'。只有小于的时候才补'\0'。

Parameters

destinationPointer
            to the destination array where the content is to be copied.

source
            C string to be copied.

numMaximum
            number of characters to be copied from source.

Return Value destination is returned.

/* strncpy example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str1[]= "To be or not to be";
  char str2[6];
  strncpy (str2,str1,5);
  str2[5]='\0';
  puts (str2);
  return 0;
}

Output:

To be