libdecnumber/bid/decimal32.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 decimal32FromString __dpd32FromString
#define decimal32ToString __dpd32ToString
#define decimal32ToEngString __dpd32ToEngString
#define decimal32FromNumber __dpd32FromNumber
#define decimal32ToNumber __dpd32ToNumber

#include "dpd/decimal32.c"

#undef decimal32FromString
#undef decimal32ToString
#undef decimal32ToEngString
#undef decimal32FromNumber
#undef decimal32ToNumber

#include "bid-dpd.h"

#ifdef IN_LIBGCC2
#define decimal32FromString __decimal32FromString
#define decimal32ToString __decimal32ToString
#define decimal32ToEngString __decimal32ToEngString
#define decimal32FromNumber __decimal32FromNumber
#define decimal32ToNumber __decimal32ToNumber
#endif

decimal32 *decimal32FromString (decimal32 *, const char *, decContext *);
char *decimal32ToString (const decimal32 *, char *);
char *decimal32ToEngString (const decimal32 *, char *);
decimal32 *decimal32FromNumber (decimal32 *, const decNumber *, decContext *);
decNumber *decimal32ToNumber (const decimal32 *, decNumber *);

void __host_to_ieee_32 (_Decimal32 in, decimal32 *out);
void __ieee_to_host_32 (decimal32 in, _Decimal32 *out);

decimal32 *
decimal32FromNumber (decimal32 *d32, const decNumber *dn,
		      decContext *set)
{
  /* decimal32 and _Decimal32 are different types.  */
  union
    {
      _Decimal32 _Dec;
      decimal32 dec;
    } u;

  __dpd32FromNumber (d32, dn, set);

  /* __dpd32FromNumber returns in big endian. But _dpd_to_bid32 takes
     host endian. */
  __ieee_to_host_32 (*d32, &u._Dec);

  /* Convert DPD to BID.  */
  _dpd_to_bid32 (&u._Dec, &u._Dec);

  /* dfp.c is in bid endian. */
  __host_to_ieee_32 (u._Dec, &u.dec);

  /* d32 is returned as a pointer to _Decimal32 here.  */
  *d32 = u.dec;

  return d32;
}

decNumber *
decimal32ToNumber (const decimal32 *bid32, decNumber *dn)
{
  /* decimal32 and _Decimal32 are different types.  */
  union
    {
      _Decimal32 _Dec;
      decimal32 dec;
    } u;

  /* bid32 is a pointer to _Decimal32 in bid endian. But _bid_to_dpd32
     takes host endian.  */
  __ieee_to_host_32 (*bid32, &u._Dec);

  /* Convert BID to DPD.  */
  _bid_to_dpd32 (&u._Dec, &u._Dec);

  /* __dpd32ToNumber is in bid endian.  */
  __host_to_ieee_32 (u._Dec, &u.dec);

  return __dpd32ToNumber (&u.dec, dn);
}

char *
decimal32ToString (const decimal32 *d32, char *string)
{
  decNumber dn;			/* work */
  decimal32ToNumber (d32, &dn);
  decNumberToString (&dn, string);
  return string;
}

char *
decimal32ToEngString (const decimal32 *d32, char *string)
{
  decNumber dn;			/* work */
  decimal32ToNumber (d32, &dn);
  decNumberToEngString (&dn, string);
  return string;
}

decimal32 *
decimal32FromString (decimal32 *result, const char *string,
		      decContext *set)
{
  decContext dc;		/* work */
  decNumber dn;			/* .. */

  decContextDefault (&dc, DEC_INIT_DECIMAL32);	/* no traps, please */
  dc.round = set->round;	/* use supplied rounding */

  decNumberFromString (&dn, string, &dc);	/* will round if needed */
  decimal32FromNumber (result, &dn, &dc);
  if (dc.status != 0)
    {				/* something happened */
      decContextSetStatus (set, dc.status);	/* .. pass it on */
    }
  return result;
}