strtold.c

来自「Glibc 2.3.2源代码(解压后有100多M)」· C语言 代码 · 共 44 行

/* Copyright (C) 1999 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <math.h>

/* The actual implementation for all floating point sizes is in strtod.c.
   These macros tell it to produce the `long double' version, `strtold'.  */

# define FLOAT		long double
# define FLT		LDBL
# ifdef USE_IN_EXTENDED_LOCALE_MODEL
#  define STRTOF	__strtold_l
# else
#  define STRTOF	strtold
# endif
# define MPN2FLOAT	__mpn_construct_long_double
# define FLOAT_HUGE_VAL	HUGE_VALL
# define SET_MANTISSA(flt, mant) \
  do { union ieee854_long_double u;					      \
       u.d = (flt);							      \
       u.ieee.mantissa0 = 0x8000;					      \
       u.ieee.mantissa1 = 0;						      \
       u.ieee.mantissa2 = ((mant) >> 32);	      			      \
       u.ieee.mantissa3 = (mant) & 0xffffffff;				      \
       (flt) = u.d;							      \
  } while (0)

# include "strtod.c"