libdecnumber/bid/decimal128.c

   1 /* Copyright (C) 2007-2018 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 }