libdecnumber/bid/decimal64.c

/* Copyright (C) 2007
   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

GCC 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 General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

#define decimal64FromString __dpd64FromString
#define decimal64ToString __dpd64ToString
#define decimal64ToEngString __dpd64ToEngString
#define decimal64FromNumber __dpd64FromNumber
#define decimal64ToNumber __dpd64ToNumber

#include "dpd/decimal64.c"

#undef decimal64FromString
#undef decimal64ToString
#undef decimal64ToEngString
#undef decimal64FromNumber
#undef decimal64ToNumber

#include "bid-dpd.h"

#ifdef IN_LIBGCC2
#define decimal64FromString __decimal64FromString
#define decimal64ToString __decimal64ToString
#define decimal64ToEngString __decimal64ToEngString
#define decimal64FromNumber __decimal64FromNumber
#define decimal64ToNumber __decimal64ToNumber
#endif

decimal64 *decimal64FromString (decimal64 *, const char *, decContext *);
char *decimal64ToString (const decimal64 *, char *);
char *decimal64ToEngString (const decimal64 *, char *);
decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *);
decNumber *decimal64ToNumber (const decimal64 *, decNumber *);

void __host_to_ieee_64 (_Decimal64 in, decimal64 *out);
void __ieee_to_host_64 (decimal64 in, _Decimal64 *out);

decimal64 *
decimal64FromNumber (decimal64 *d64, const decNumber *dn,
		      decContext *set)
{
  /* decimal64 and _Decimal64 are different types.  */
  union
    {
      _Decimal64 _Dec;
      decimal64 dec;
    } u;

  __dpd64FromNumber (d64, dn, set);

  /* __dpd64FromNumber returns in big endian. But _dpd_to_bid64 takes
     host endian. */
  __ieee_to_host_64 (*d64, &u._Dec);

  /* Convert DPD to BID.  */
  _dpd_to_bid64 (&u._Dec, &u._Dec);

  /* dfp.c is in bid endian. */
  __host_to_ieee_64 (u._Dec, &u.dec);

  /* d64 is returned as a pointer to _Decimal64 here.  */
  *d64 = u.dec;

  return d64;
}

decNumber *
decimal64ToNumber (const decimal64 *bid64, decNumber *dn)
{
  /* decimal64 and _Decimal64 are different types.  */
  union
    {
      _Decimal64 _Dec;
      decimal64 dec;
    } u;

  /* bid64 is a pointer to _Decimal64 in bid endian. But _bid_to_dpd64
     takes host endian.  */
  __ieee_to_host_64 (*bid64, &u._Dec);

  /* Convert BID to DPD.  */
  _bid_to_dpd64 (&u._Dec, &u._Dec);

  /* __dpd64ToNumber is in bid endian.  */
  __host_to_ieee_64 (u._Dec, &u.dec);

  return __dpd64ToNumber (&u.dec, dn);
}

char *
decimal64ToString (const decimal64 *d64, char *string)
{
  decNumber dn;			/* work */
  decimal64ToNumber (d64, &dn);
  decNumberToString (&dn, string);
  return string;
}

char *
decimal64ToEngString (const decimal64 *d64, char *string)
{
  decNumber dn;			/* work */
  decimal64ToNumber (d64, &dn);
  decNumberToEngString (&dn, string);
  return string;
}

decimal64 *
decimal64FromString (decimal64 *result, const char *string,
		      decContext *set)
{
  decContext dc;		/* work */
  decNumber dn;			/* .. */

  decContextDefault (&dc, DEC_INIT_DECIMAL64);	/* no traps, please */
  dc.round = set->round;	/* use supplied rounding */

  decNumberFromString (&dn, string, &dc);	/* will round if needed */
  decimal64FromNumber (result, &dn, &dc);
  if (dc.status != 0)
    {				/* something happened */
      decContextSetStatus (set, dc.status);	/* .. pass it on */
    }
  return result;
}