1  /* Copyright (C) 2007-2023 Free Software Foundation, Inc.
       2  
       3  This file is part of GCC.
       4  
       5  GCC is free software; you can redistribute it and/or modify it under
       6  the terms of the GNU General Public License as published by the Free
       7  Software Foundation; either version 3, or (at your option) any later
       8  version.
       9  
      10  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      11  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      13  for more details.
      14  
      15  Under Section 7 of GPL version 3, you are granted additional
      16  permissions described in the GCC Runtime Library Exception, version
      17  3.1, as published by the Free Software Foundation.
      18  
      19  You should have received a copy of the GNU General Public License and
      20  a copy of the GCC Runtime Library Exception along with this program;
      21  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      22  <http://www.gnu.org/licenses/>.  */
      23  
      24  #define decimal128FromString __dpd128FromString
      25  #define decimal128ToString __dpd128ToString
      26  #define decimal128ToEngString __dpd128ToEngString
      27  #define decimal128FromNumber __dpd128FromNumber
      28  #define decimal128ToNumber __dpd128ToNumber
      29  
      30  #include "dpd/decimal128.c"
      31  
      32  #undef decimal128FromString
      33  #undef decimal128ToString
      34  #undef decimal128ToEngString
      35  #undef decimal128FromNumber
      36  #undef decimal128ToNumber
      37  
      38  #include "bid-dpd.h"
      39  
      40  #ifdef IN_LIBGCC2
      41  #define decimal128FromString __decimal128FromString
      42  #define decimal128ToString __decimal128ToString
      43  #define decimal128ToEngString __decimal128ToEngString
      44  #define decimal128FromNumber __decimal128FromNumber
      45  #define decimal128ToNumber __decimal128ToNumber
      46  #endif
      47  
      48  decimal128 *decimal128FromString (decimal128 *, const char *, decContext *);
      49  char *decimal128ToString (const decimal128 *, char *);
      50  char *decimal128ToEngString (const decimal128 *, char *);
      51  decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *);
      52  decNumber *decimal128ToNumber (const decimal128 *, decNumber *);
      53  
      54  void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
      55  void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
      56  
      57  decimal128 *
      58  decimal128FromNumber (decimal128 *d128, const decNumber *dn,
      59  		      decContext *set)
      60  {
      61    /* decimal128 and _Decimal128 are different types.  */
      62    union
      63      {
      64        _Decimal128 _Dec;
      65        decimal128 dec;
      66      } u;
      67  
      68    __dpd128FromNumber (d128, dn, set);
      69  
      70    /* __dpd128FromNumber returns in big endian. But _dpd_to_bid128 takes
      71       host endian. */
      72    __ieee_to_host_128 (*d128, &u._Dec);
      73  
      74    /* Convert DPD to BID.  */
      75    _dpd_to_bid128 (&u._Dec, &u._Dec);
      76  
      77    /* dfp.c is in bid endian. */
      78    __host_to_ieee_128 (u._Dec, &u.dec);
      79  
      80    /* d128 is returned as a pointer to _Decimal128 here.  */
      81    *d128 = u.dec;
      82  
      83    return d128;
      84  }
      85  
      86  decNumber *
      87  decimal128ToNumber (const decimal128 *bid128, decNumber *dn)
      88  {
      89    /* decimal128 and _Decimal128 are different types.  */
      90    union
      91      {
      92        _Decimal128 _Dec;
      93        decimal128 dec;
      94      } u;
      95  
      96    /* bid128 is a pointer to _Decimal128 in bid endian. But _bid_to_dpd128
      97       takes host endian.  */
      98    __ieee_to_host_128 (*bid128, &u._Dec);
      99  
     100    /* Convert BID to DPD.  */
     101    _bid_to_dpd128 (&u._Dec, &u._Dec);
     102  
     103    /* __dpd128ToNumber is in bid endian.  */
     104    __host_to_ieee_128 (u._Dec, &u.dec);
     105  
     106    return __dpd128ToNumber (&u.dec, dn);
     107  }
     108  
     109  char *
     110  decimal128ToString (const decimal128 *d128, char *string)
     111  {
     112    decNumber dn;			/* work */
     113    decimal128ToNumber (d128, &dn);
     114    decNumberToString (&dn, string);
     115    return string;
     116  }
     117  
     118  char *
     119  decimal128ToEngString (const decimal128 *d128, char *string)
     120  {
     121    decNumber dn;			/* work */
     122    decimal128ToNumber (d128, &dn);
     123    decNumberToEngString (&dn, string);
     124    return string;
     125  }
     126  
     127  decimal128 *
     128  decimal128FromString (decimal128 *result, const char *string,
     129  		      decContext *set)
     130  {
     131    decContext dc;		/* work */
     132    decNumber dn;			/* .. */
     133  
     134    decContextDefault (&dc, DEC_INIT_DECIMAL128);	/* no traps, please */
     135    dc.round = set->round;	/* use supplied rounding */
     136  
     137    decNumberFromString (&dn, string, &dc);	/* will round if needed */
     138    decimal128FromNumber (result, &dn, &dc);
     139    if (dc.status != 0)
     140      {				/* something happened */
     141        decContextSetStatus (set, dc.status);	/* .. pass it on */
     142      }
     143    return result;
     144  }