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fixsdsi.c

/* Handle conversion from Decimal32 to binary integer (32)

   Copyright (C) 2007, 2008 IBM Corporation.
   Copyright (C) 2008, 2009 Free Software Foundation, Inc.

   This file is part of the Decimal Floating Point C Library.

   Author(s): Pete Eberlein <eberlein@us.ibm.com>

   The Decimal Floating Point C Library is free software; you can
   redistribute it and/or modify it under the terms of the GNU Lesser
   General Public License version 2.1.

   The Decimal Floating Point 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 version 2.1 for more details.

   You should have received a copy of the GNU Lesser General Public
   License version 2.1 along with the Decimal Floating Point C Library;
   if not, write to the Free Software Foundation, Inc., 59 Temple Place,
   Suite 330, Boston, MA 02111-1307 USA.

   Please see libdfp/COPYING.txt for more information.  */

#ifndef DECIMAL_TO_INTEGER
#define DECIMAL_TO_INTEGER
#define SRC 32
#define DEST 32
#define NAME fix
#endif

#include "dfpacc.h"
#include "convert.h"
#include <string.h>
/*#include <stdlib.h> */

#define BUFMAX 128

DEST_TYPE
PREFIXED_FUNCTION_NAME (SRC_TYPE a)
{
  /* decNumber's decimal* types have the same format as C's _Decimal*
     types, but they have different calling conventions.  */

  /* TODO: Decimal float to integer conversions should raise FE_INVALID
     if the result value does not fit into the result type.  */

  char buf[BUFMAX];
  char *pos;
  decNumber qval, n1, n2;
  decContext context;
  IEEE_SRC_TYPE e;

  /* Use a large context to avoid losing precision.  */
  ___decContextDefault (&context, DEC_INIT_DECIMAL128);
  /* Need non-default rounding mode here.  */
  context.round = DEC_ROUND_DOWN;

  PASTE(___host_to_ieee_,SRC) ((&a), &e);
  PASTE(___decimal,PASTE(SRC,ToNumber))(&e, &n1);
  /* PASTE(___decimal,PASTE(SRC,ToNumber))(&a, &n1); */

  /* Rescale if the exponent is less than zero.  */
  ___decNumberToIntegralValue (&n2, &n1, &context);
  /* Get a value to use for the quantize call.  */
  ___decNumberFromString (&qval, (char *) "1.0", &context);
  /* Force the exponent to zero.  */
  ___decNumberQuantize (&n1, &n2, &qval, &context);
  /* Get a string, which at this point will not include an exponent.  */
  ___decNumberToString (&n1, buf);
  /* Ignore the fractional part.  */
  pos = strchr (buf, '.');
  if (pos)
    *pos = 0;
  /* Use a C library function to convert to the integral type.  */
  return STR_TO_INT (buf, NULL, 10);
}

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