1  static const double internalEndianMagic = 7.949928895127363e-275;
       2  static const unsigned char ieee_754_mantissa_mask[] = { 0x00, 0x0F, 0xFF, 0xFF,
       3      0xFF, 0xFF, 0xFF, 0xFF };
       4  static inline int 
       5  trio_isnan (double number)
       6  {
       7    int has_mantissa = 0;
       8    unsigned int i;
       9    unsigned char current;
      10    for (i = 0; i < (unsigned int)sizeof(double); i++)
      11      {
      12        current = ((unsigned char *)&number)[(((unsigned char
      13  					      *)&internalEndianMagic)[7-(i)])];
      14        has_mantissa |= (current & ieee_754_mantissa_mask[i]);
      15      }
      16    return has_mantissa;
      17  }
      18  void
      19  xmlXPathEqualNodeSetFloat(int nodeNr, double v)
      20  {
      21    int i;
      22    for (i=0; i<nodeNr; i++)
      23      if (!trio_isnan(v))
      24        break;
      25  }
      26