gcc/mpfr/set_str_raw.c

/* mpfr_set_str_binary -- set a floating-point number from a binary string

Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by the Arenaire and Cacao projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR 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 MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301, USA. */

#include "mpfr-impl.h"

/* Currently the number should be of the form +/- xxxx.xxxxxxEyy, with
   decimal exponent. The mantissa of x is supposed to be large enough
   to hold all the bits of str. */

void
mpfr_set_str_binary (mpfr_ptr x, const char *str)
{
  int has_sign;
  int res;

  if (*str == 'N')
    {
      MPFR_SET_NAN(x);
      __gmpfr_flags |= MPFR_FLAGS_NAN;
      return;
    }

  has_sign = *str == '-' || *str == '+';
  if (str[has_sign] == 'I')
    {
      MPFR_SET_INF(x);
      if (*str == '-')
        MPFR_SET_NEG(x);
      else
        MPFR_SET_POS(x);
      return;
    }

  res = mpfr_strtofr (x, str, 0, 2, GMP_RNDZ);
  MPFR_ASSERTN (res == 0);
}