libdecnumber/bid/decimal64.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 decimal64FromString __dpd64FromString
  25 #define decimal64ToString __dpd64ToString
  26 #define decimal64ToEngString __dpd64ToEngString
  27 #define decimal64FromNumber __dpd64FromNumber
  28 #define decimal64ToNumber __dpd64ToNumber
  29
  30 #include "dpd/decimal64.c"
  31
  32 #undef decimal64FromString
  33 #undef decimal64ToString
  34 #undef decimal64ToEngString
  35 #undef decimal64FromNumber
  36 #undef decimal64ToNumber
  37
  38 #include "bid-dpd.h"
  39
  40 #ifdef IN_LIBGCC2
  41 #define decimal64FromString __decimal64FromString
  42 #define decimal64ToString __decimal64ToString
  43 #define decimal64ToEngString __decimal64ToEngString
  44 #define decimal64FromNumber __decimal64FromNumber
  45 #define decimal64ToNumber __decimal64ToNumber
  46 #endif
  47
  48 decimal64 *decimal64FromString (decimal64 *, const char *, decContext *);
  49 char *decimal64ToString (const decimal64 *, char *);
  50 char *decimal64ToEngString (const decimal64 *, char *);
  51 decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *);
  52 decNumber *decimal64ToNumber (const decimal64 *, decNumber *);
  53
  54 void __host_to_ieee_64 (_Decimal64 in, decimal64 *out);
  55 void __ieee_to_host_64 (decimal64 in, _Decimal64 *out);
  56
  57 decimal64 *
  58 decimal64FromNumber (decimal64 *d64, const decNumber *dn,
  59                       decContext *set)
  60 {
  61   /* decimal64 and _Decimal64 are different types.  */
  62   union
  63     {
  64       _Decimal64 _Dec;
  65       decimal64 dec;
  66     } u;
  67
  68   __dpd64FromNumber (d64, dn, set);
  69
  70   /* __dpd64FromNumber returns in big endian. But _dpd_to_bid64 takes
  71      host endian. */
  72   __ieee_to_host_64 (*d64, &u._Dec);
  73
  74   /* Convert DPD to BID.  */
  75   _dpd_to_bid64 (&u._Dec, &u._Dec);
  76
  77   /* dfp.c is in bid endian. */
  78   __host_to_ieee_64 (u._Dec, &u.dec);
  79
  80   /* d64 is returned as a pointer to _Decimal64 here.  */
  81   *d64 = u.dec;
  82
  83   return d64;
  84 }
  85
  86 decNumber *
  87 decimal64ToNumber (const decimal64 *bid64, decNumber *dn)
  88 {
  89   /* decimal64 and _Decimal64 are different types.  */
  90   union
  91     {
  92       _Decimal64 _Dec;
  93       decimal64 dec;
  94     } u;
  95
  96   /* bid64 is a pointer to _Decimal64 in bid endian. But _bid_to_dpd64
  97      takes host endian.  */
  98   __ieee_to_host_64 (*bid64, &u._Dec);
  99
 100   /* Convert BID to DPD.  */
 101   _bid_to_dpd64 (&u._Dec, &u._Dec);
 102
 103   /* __dpd64ToNumber is in bid endian.  */
 104   __host_to_ieee_64 (u._Dec, &u.dec);
 105
 106   return __dpd64ToNumber (&u.dec, dn);
 107 }
 108
 109 char *
 110 decimal64ToString (const decimal64 *d64, char *string)
 111 {
 112   decNumber dn;                 /* work */
 113   decimal64ToNumber (d64, &dn);
 114   decNumberToString (&dn, string);
 115   return string;
 116 }
 117
 118 char *
 119 decimal64ToEngString (const decimal64 *d64, char *string)
 120 {
 121   decNumber dn;                 /* work */
 122   decimal64ToNumber (d64, &dn);
 123   decNumberToEngString (&dn, string);
 124   return string;
 125 }
 126
 127 decimal64 *
 128 decimal64FromString (decimal64 *result, const char *string,
 129                       decContext *set)
 130 {
 131   decContext dc;                /* work */
 132   decNumber dn;                 /* .. */
 133
 134   decContextDefault (&dc, DEC_INIT_DECIMAL64);  /* no traps, please */
 135   dc.round = set->round;        /* use supplied rounding */
 136
 137   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 138   decimal64FromNumber (result, &dn, &dc);
 139   if (dc.status != 0)
 140     {                           /* something happened */
 141       decContextSetStatus (set, dc.status);     /* .. pass it on */
 142     }
 143   return result;
 144 }