if (exponent == 0 ? !zero_mantissa : exponent < IEEE754_DOUBLE_BIAS)
if (exponent == 0) { if (zero_mantissa) expnegative = 0; else {  expnegative = 1; exponent = -(1 - IEEE754_DOUBLE_BIAS); } } else if (exponent >= IEEE754_DOUBLE_BIAS) { expnegative = 0; exponent -= IEEE754_DOUBLE_BIAS; } else
__printf_fphex (FILE *fp,		const struct printf_info *info,		const void *const *args){  /* The floating-point value to output.  */  union    {      union ieee754_double dbl;      union ieee854_long_double ldbl;    }  fpnum;  /* Locale-dependent representation of decimal point.	*/  wchar_t decimal;  /* "NaN" or "Inf" for the special cases.  */  const char *special = NULL;  /* Buffer for the generated number string for the mantissa.  The     maximal size for the mantissa is 64 bits.  */  char numbuf[16];  char *numstr;  char *numend;  int negative;  /* The maximal exponent of two in decimal notation has 5 digits.  */  char expbuf[5];  char *expstr;  int expnegative;  int exponent;  /* Non-zero is mantissa is zero.  */  int zero_mantissa;  /* The leading digit before the decimal point.  */  char leading;  /* Precision.  */  int precision = info->prec;  /* Width.  */  int width = info->width;  /* Number of characters written.  */  int done = 0;  /* Figure out the decimal point character.  */  if (info->extra == 0)    {      if (mbtowc (&decimal, _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT),		  strlen (_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT))) <= 0)	decimal = (wchar_t) *_NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);    }  else    {      if (mbtowc (&decimal, _NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT),		  strlen (_NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT))) <= 0)	decimal = (wchar_t) *_NL_CURRENT (LC_MONETARY, MON_DECIMAL_POINT);    }  /* Give default value.  */  if (decimal == L'\0')    decimal = L'.';  /* Fetch the argument value.	*/  if (info->is_long_double && sizeof (long double) > sizeof (double))    {      fpnum.ldbl.d = *(const long double *) args[0];      /* Check for special values: not a number or infinity.  */      if (__isnanl (fpnum.ldbl.d))	{	  special = isupper (info->spec) ? "NAN" : "nan";	  negative = 0;	}      else	{	  if (__isinfl (fpnum.ldbl.d))	    special = isupper (info->spec) ? "INF" : "inf";	  negative = signbit (fpnum.ldbl.d);	}    }  else    {      fpnum.dbl.d = *(const double *) args[0];      /* Check for special values: not a number or infinity.  */      if (__isnan (fpnum.dbl.d))	{	  special = isupper (info->spec) ? "NAN" : "nan";	  negative = 0;	}      else	{	  if (__isinf (fpnum.dbl.d))	    special = isupper (info->spec) ? "INF" : "inf";	  negative = signbit (fpnum.dbl.d);	}    }  if (special)    {      int width = info->width;      if (negative || info->showsign || info->space)	--width;      width -= 3;      if (!info->left && width > 0)	PADN (' ', width);      if (negative)	outchar ('-');      else if (info->showsign)	outchar ('+');      else if (info->space)	outchar (' ');      PRINT (special, 3);      if (info->left && width > 0)	PADN (' ', width);      return done;    }  /* We are handling here only 64 and 80 bit IEEE foating point     numbers.  */  if (info->is_long_double == 0 || sizeof (double) == sizeof (long double))    {      /* We have 52 bits of mantissa plus one implicit digit.  Since	 52 bits are representable without rest using hexadecimal	 digits we use only the implicit digits for the number before	 the decimal point.  */      unsigned long long int num;      num = (((unsigned long long int) fpnum.dbl.ieee.mantissa0) << 32	     | fpnum.dbl.ieee.mantissa1);      zero_mantissa = num == 0;      if (sizeof (unsigned long int) > 6)	numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,			     info->spec == 'A');      else	numstr = _itoa (num, numbuf + sizeof numbuf, 16,			info->spec == 'A');      /* Fill with zeroes.  */      while (numstr > numbuf + (sizeof numbuf - 52 / 4))	*--numstr = '0';      leading = fpnum.dbl.ieee.exponent == 0 ? '0' : '1';      exponent = fpnum.dbl.ieee.exponent;      if (exponent == 0 ? !zero_mantissa : exponent < IEEE754_DOUBLE_BIAS)	{	  expnegative = 1;	  exponent = -(exponent - IEEE754_DOUBLE_BIAS);	}      else	{	  expnegative = 0;	  if (exponent != 0)	    exponent -= IEEE754_DOUBLE_BIAS;	}    }  else    {      /* The "strange" 80 bit format on ix86 and m68k has an explicit	 leading digit in the 64 bit mantissa.  */      unsigned long long int num;      assert (sizeof (long double) == 12);      num = (((unsigned long long int) fpnum.ldbl.ieee.mantissa0) << 32	     | fpnum.ldbl.ieee.mantissa1);      zero_mantissa = num == 0;      if (sizeof (unsigned long int) > 6)	numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,			     info->spec == 'A');      else	numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');      /* Fill with zeroes.  */      while (numstr > numbuf + (sizeof numbuf - 64 / 4))	*--numstr = '0';      /* We use a full nibble for the leading digit.  */      leading = *numstr++;      /* We have 3 bits from the mantissa in the leading nibble.  */      exponent = fpnum.ldbl.ieee.exponent;      if (exponent == 0 ? !zero_mantissa	  : exponent < IEEE854_LONG_DOUBLE_BIAS + 3)	{	  expnegative = 1;	  exponent = -(exponent - (IEEE854_LONG_DOUBLE_BIAS + 3));	}      else	{	  expnegative = 0;	  if (exponent != 0)	    exponent -= IEEE854_LONG_DOUBLE_BIAS + 3;	}    }  /* Look for trailing zeroes.  */  if (! zero_mantissa)    {      numend = numbuf + sizeof numbuf;      while (numend[-1] == '0')	--numend;      if (precision == -1)	precision = numend - numstr;      else if (precision < numend - numstr	       && (numstr[precision] > '8'		   || (('A' < '0' || 'a' < '0')		       && numstr[precision] < '0')		   || (numstr[precision] == '8'		       && (precision + 1 < numend - numstr			   /* Round to even.  */			   || (precision > 0			       && ((numstr[precision - 1] & 1)				   ^ (isdigit (numstr[precision - 1]) == 0)))			   || (precision == 0			       && ((leading & 1)				   ^ (isdigit (leading) == 0)))))))	{	  /* Round up.  */	  int cnt = precision;	  while (--cnt >= 0)	    {	      char ch = numstr[cnt];	      /* We assume that the digits and the letters are ordered		 like in ASCII.  This is true for the rest of GNU, too.  */	      if (ch == '9')		{		  numstr[cnt] = info->spec;	/* This is tricky,						   think about it!  */		  break;		}	      else if (tolower (ch) < 'f')		{		  ++numstr[cnt];		  break;		}	      else		numstr[cnt] = '0';	    }	  if (cnt < 0)	    {	      /* The mantissa so far was fff...f  Now increment the		 leading digit.  Here it is again possible that we		 get an overflow.  */	      if (leading == '9')		leading = info->spec;	      else if (tolower (leading) < 'f')		++leading;	      else		{		  leading = 1;		  if (expnegative)		    {		      exponent += 4;		      if (exponent >= 0)			expnegative = 0;		    }		  else		    exponent += 4;		}	    }	}    }  else    numend = numstr;  /* Now we can compute the exponent string.  */  expstr = _itoa_word (exponent, expbuf + sizeof expbuf, 10, 0);  /* Now we have all information to compute the size.  */  width -= ((negative || info->showsign || info->space)	    /* Sign.  */	    + 2    + 1 + 1 + precision + 1 + 1	    /* 0x    h   .   hhh         P   ExpoSign.  */	    + ((expbuf + sizeof expbuf) - expstr));	    /* Exponent.  */  /* A special case if when the mantissa is zero and the `#' is not     given.  In this case we must not print the decimal point.  */  if (zero_mantissa && precision == 0 && !info->alt)    ++width;		/* This nihilates the +1 for the decimal-point			   character in the following equation.  */  if (!info->left && width > 0)    PADN (' ', width);  if (negative)    outchar ('-');  else if (info->showsign)    outchar ('+');  else if (info->space)    outchar (' ');  outchar ('0');  outchar (info->spec == 'A' ? 'X' : 'x');  outchar (leading);  if (!zero_mantissa || precision > 0 || info->alt)    outchar (decimal);  if (!zero_mantissa || precision > 0)    {      PRINT (numstr, MIN (numend - numstr, precision));      if (precision > numend - numstr)	PADN ('0', precision - (numend - numstr));    }  if (info->left && info->pad == '0' && width > 0)    PADN ('0', width);  outchar (info->spec == 'A' ? 'P' : 'p');  outchar (expnegative ? '-' : '+');  PRINT (expstr, (expbuf + sizeof expbuf) - expstr);  if (info->left && info->pad != '0' && width > 0)    PADN (info->pad, width);  return done;}