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#define A_SIZE 16
char *string_data;
char a[A_SIZE];
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if (string_data) {
  if (strlen(string_data) < sizeof(a)) {
    strcpy(a, string_data);
  }
  else {
    /* handle string too large condition */
  }
}
else {
  /* handle null string condition */
}

Compliant Solution 3

Example using The strncpy_s()The strncpy_s function copies not more than a maximum number n of successive characters (characters that
follow a null character are not copied) from the source array pointed to by s2 to the array
pointed to by s1to a destination array. If no null character was copied from s2the source array, then s1n the nth position in the destination array is set to a null
character.character, guaranteeing that the resulting string is null-terminated.

This compliant solution also guarantees that the string is null-terminated.

Exception

An exception to this rule applies if the intent of the programmer was to convert a null-terminated byte string to a character array.  To be compliant with this standard, this intent must be made clear statement in comments.

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