libdecnumber/bid/decimal128.c

   1 /* Copyright (C) 2007, 2009
   2    Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 #define decimal128FromString __dpd128FromString
  26 #define decimal128ToString __dpd128ToString
  27 #define decimal128ToEngString __dpd128ToEngString
  28 #define decimal128FromNumber __dpd128FromNumber
  29 #define decimal128ToNumber __dpd128ToNumber
  30
  31 #include "dpd/decimal128.c"
  32
  33 #undef decimal128FromString
  34 #undef decimal128ToString
  35 #undef decimal128ToEngString
  36 #undef decimal128FromNumber
  37 #undef decimal128ToNumber
  38
  39 #include "bid-dpd.h"
  40
  41 #ifdef IN_LIBGCC2
  42 #define decimal128FromString __decimal128FromString
  43 #define decimal128ToString __decimal128ToString
  44 #define decimal128ToEngString __decimal128ToEngString
  45 #define decimal128FromNumber __decimal128FromNumber
  46 #define decimal128ToNumber __decimal128ToNumber
  47 #endif
  48
  49 decimal128 *decimal128FromString (decimal128 *, const char *, decContext *);
  50 char *decimal128ToString (const decimal128 *, char *);
  51 char *decimal128ToEngString (const decimal128 *, char *);
  52 decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *);
  53 decNumber *decimal128ToNumber (const decimal128 *, decNumber *);
  54
  55 void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
  56 void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
  57
  58 decimal128 *
  59 decimal128FromNumber (decimal128 *d128, const decNumber *dn,
  60                       decContext *set)
  61 {
  62   /* decimal128 and _Decimal128 are different types.  */
  63   union
  64     {
  65       _Decimal128 _Dec;
  66       decimal128 dec;
  67     } u;
  68
  69   __dpd128FromNumber (d128, dn, set);
  70
  71   /* __dpd128FromNumber returns in big endian. But _dpd_to_bid128 takes
  72      host endian. */
  73   __ieee_to_host_128 (*d128, &u._Dec);
  74
  75   /* Convert DPD to BID.  */
  76   _dpd_to_bid128 (&u._Dec, &u._Dec);
  77
  78   /* dfp.c is in bid endian. */
  79   __host_to_ieee_128 (u._Dec, &u.dec);
  80
  81   /* d128 is returned as a pointer to _Decimal128 here.  */
  82   *d128 = u.dec;
  83
  84   return d128;
  85 }
  86
  87 decNumber *
  88 decimal128ToNumber (const decimal128 *bid128, decNumber *dn)
  89 {
  90   /* decimal128 and _Decimal128 are different types.  */
  91   union
  92     {
  93       _Decimal128 _Dec;
  94       decimal128 dec;
  95     } u;
  96
  97   /* bid128 is a pointer to _Decimal128 in bid endian. But _bid_to_dpd128
  98      takes host endian.  */
  99   __ieee_to_host_128 (*bid128, &u._Dec);
 100
 101   /* Convert BID to DPD.  */
 102   _bid_to_dpd128 (&u._Dec, &u._Dec);
 103
 104   /* __dpd128ToNumber is in bid endian.  */
 105   __host_to_ieee_128 (u._Dec, &u.dec);
 106
 107   return __dpd128ToNumber (&u.dec, dn);
 108 }
 109
 110 char *
 111 decimal128ToString (const decimal128 *d128, char *string)
 112 {
 113   decNumber dn;                 /* work */
 114   decimal128ToNumber (d128, &dn);
 115   decNumberToString (&dn, string);
 116   return string;
 117 }
 118
 119 char *
 120 decimal128ToEngString (const decimal128 *d128, char *string)
 121 {
 122   decNumber dn;                 /* work */
 123   decimal128ToNumber (d128, &dn);
 124   decNumberToEngString (&dn, string);
 125   return string;
 126 }
 127
 128 decimal128 *
 129 decimal128FromString (decimal128 *result, const char *string,
 130                       decContext *set)
 131 {
 132   decContext dc;                /* work */
 133   decNumber dn;                 /* .. */
 134
 135   decContextDefault (&dc, DEC_INIT_DECIMAL128); /* no traps, please */
 136   dc.round = set->round;        /* use supplied rounding */
 137
 138   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 139   decimal128FromNumber (result, &dn, &dc);
 140   if (dc.status != 0)
 141     {                           /* something happened */
 142       decContextSetStatus (set, dc.status);     /* .. pass it on */
 143     }
 144   return result;
 145 }