c++ - How to avoid strcpy_s buffer too small -

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I have to copy the std :: string data into four arrays. The length of my string is variable, but the length of my four array is fixed. 

  const int = 5; Four names [size]; Std :: string data = "1234567890"; Strcpy_s (name, 5, data.c_str ()); // buffer causes buffer too small claims strcpy_s (name, 11, data.c_str ()); // copies fine (data length and zero) strcpy_s (name, size (data), data.c_str ()); // copy is ok   
 How can I always copy the length of the array safely?  
 Should I like this every time?  
  std :: string to copy = data.substr (0, size-1); Strcpy_s (name, toCopy.c_str ());    
 
 
  _TRUNCATE    
 
  strncpy_s (name, data.c_str (), _TRUNCATE);   
 Anyone can copy it to fill the  name  buffer while still keeping in mind the termination termination (unlike conventional struncup ).

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