strncpy

char *strncpy(char *dest, const char *src, size_t n);

char *
strncpy(char *dest, const char *src, size_t n)
{
    size_t i;

   for (i = 0; i < n && src[i] != '\0'; i++)
        dest[i] = src[i];
    for ( ; i < n; i++)
        dest[i] = '\0';

   return dest;
}