Function that returns true if all bytes in a buffer are NULL. This is useful for testing whether opaque structures like FSRef are valid, presumably after having been bzero'd.

int IsZeros(const void *s1, size_t n) {
  if (n != 0) {
    const unsigned char *p1 = s1;
    
    do {
      if (*p1++ != 0)
        return (0);
    } while (--n != 0);
  }
  return (1);
}

Compatible with:

• Mac OS X 10.0
• Mac OS X 10.1
• Mac OS X 10.2
• Mac OS X 10.3
• Mac OS X 10.4 PPC
• Mac OS X 10.4 Intel
• Mac OS X 10.5 PPC
• Mac OS X 10.5 Intel

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