text: /****************************************************************
  
  The author of this software is David M. Gay.
  
  Copyright (C) 2004 by David M. Gay.
  All Rights Reserved
  Based on material in the rest of /netlib/fp/gdota.tar.gz,
  which is copyright (C) 1998, 2000 by Lucent Technologies.
  
  Permission to use, copy, modify, and distribute this software and
  its documentation for any purpose and without fee is hereby
  granted, provided that the above copyright notice appear in all
  copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of Lucent or any of its entities
  not be used in advertising or publicity pertaining to
  distribution of the software without specific, written prior
  permission.
  
  LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
  IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
  SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
  THIS SOFTWARE.
  
  ****************************************************************/
  
  /* This is a variant of strtod that works on Intel ia32 systems */
  /* with the default extended-precision arithmetic -- it does not */
  /* require setting the precision control to 53 bits.  */
  
  /* Please send bug reports to David M. Gay (dmg at acm dot org,
   * with " at " changed at "@" and " dot " changed to ".").	*/
  
  #include "gdtoaimp.h"
  
  double __strtod (const char *s, char **sp)
  {
  	static FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI };
  	ULong bits[2];
  	Long exp;
  	int k;
  	union { ULong L[2]; double d; } u;
  
  	k = __strtodg(s, sp, &fpi, &exp, bits);
  	switch(k & STRTOG_Retmask) {
  	  case STRTOG_NoNumber:
  	  case STRTOG_Zero:
  		u.L[0] = u.L[1] = 0;
  		break;
  
  	  case STRTOG_Normal:
  		u.L[_1] = bits[0];
  		u.L[_0] = (bits[1] & ~0x100000) | ((exp + 0x3ff + 52) << 20);
  		break;
  
  	  case STRTOG_Denormal:
  		u.L[_1] = bits[0];
  		u.L[_0] = bits[1];
  		break;
  
  	  case STRTOG_Infinite:
  		u.L[_0] = 0x7ff00000;
  		u.L[_1] = 0;
  		break;
  
  	  case STRTOG_NaN:
  		u.L[0] = d_QNAN0;
  		u.L[1] = d_QNAN1;
  		break;
  
  	  case STRTOG_NaNbits:
  		u.L[_0] = 0x7ff00000 | bits[1];
  		u.L[_1] = bits[0];
  	}
  	if (k & STRTOG_Neg)
  		u.L[_0] |= 0x80000000L;
  	return u.d;
  }
  