@Will: People simply might not know for sure. There are literally thousands of library functions in C. You'd need to get somebody who i) reads the answer, ii) knows that the method requires three methods in every conceivable implementation of the C standard libraries, iii) notices the error, iv) is confident enough in his/her assessment to say something and risk appearing foolish if wrong, v) cares enough to say something, and vi) is either a PPCG user or willing to sign up as one, since guests can't comment.