libdecnumber/bid/decimal64.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 decimal64FromString __dpd64FromString
  26 #define decimal64ToString __dpd64ToString
  27 #define decimal64ToEngString __dpd64ToEngString
  28 #define decimal64FromNumber __dpd64FromNumber
  29 #define decimal64ToNumber __dpd64ToNumber
  30
  31 #include "dpd/decimal64.c"
  32
  33 #undef decimal64FromString
  34 #undef decimal64ToString
  35 #undef decimal64ToEngString
  36 #undef decimal64FromNumber
  37 #undef decimal64ToNumber
  38
  39 #include "bid-dpd.h"
  40
  41 #ifdef IN_LIBGCC2
  42 #define decimal64FromString __decimal64FromString
  43 #define decimal64ToString __decimal64ToString
  44 #define decimal64ToEngString __decimal64ToEngString
  45 #define decimal64FromNumber __decimal64FromNumber
  46 #define decimal64ToNumber __decimal64ToNumber
  47 #endif
  48
  49 decimal64 *decimal64FromString (decimal64 *, const char *, decContext *);
  50 char *decimal64ToString (const decimal64 *, char *);
  51 char *decimal64ToEngString (const decimal64 *, char *);
  52 decimal64 *decimal64FromNumber (decimal64 *, const decNumber *, decContext *);
  53 decNumber *decimal64ToNumber (const decimal64 *, decNumber *);
  54
  55 void __host_to_ieee_64 (_Decimal64 in, decimal64 *out);
  56 void __ieee_to_host_64 (decimal64 in, _Decimal64 *out);
  57
  58 decimal64 *
  59 decimal64FromNumber (decimal64 *d64, const decNumber *dn,
  60                       decContext *set)
  61 {
  62   /* decimal64 and _Decimal64 are different types.  */
  63   union
  64     {
  65       _Decimal64 _Dec;
  66       decimal64 dec;
  67     } u;
  68
  69   __dpd64FromNumber (d64, dn, set);
  70
  71   /* __dpd64FromNumber returns in big endian. But _dpd_to_bid64 takes
  72      host endian. */
  73   __ieee_to_host_64 (*d64, &u._Dec);
  74
  75   /* Convert DPD to BID.  */
  76   _dpd_to_bid64 (&u._Dec, &u._Dec);
  77
  78   /* dfp.c is in bid endian. */
  79   __host_to_ieee_64 (u._Dec, &u.dec);
  80
  81   /* d64 is returned as a pointer to _Decimal64 here.  */
  82   *d64 = u.dec;
  83
  84   return d64;
  85 }
  86
  87 decNumber *
  88 decimal64ToNumber (const decimal64 *bid64, decNumber *dn)
  89 {
  90   /* decimal64 and _Decimal64 are different types.  */
  91   union
  92     {
  93       _Decimal64 _Dec;
  94       decimal64 dec;
  95     } u;
  96
  97   /* bid64 is a pointer to _Decimal64 in bid endian. But _bid_to_dpd64
  98      takes host endian.  */
  99   __ieee_to_host_64 (*bid64, &u._Dec);
 100
 101   /* Convert BID to DPD.  */
 102   _bid_to_dpd64 (&u._Dec, &u._Dec);
 103
 104   /* __dpd64ToNumber is in bid endian.  */
 105   __host_to_ieee_64 (u._Dec, &u.dec);
 106
 107   return __dpd64ToNumber (&u.dec, dn);
 108 }
 109
 110 char *
 111 decimal64ToString (const decimal64 *d64, char *string)
 112 {
 113   decNumber dn;                 /* work */
 114   decimal64ToNumber (d64, &dn);
 115   decNumberToString (&dn, string);
 116   return string;
 117 }
 118
 119 char *
 120 decimal64ToEngString (const decimal64 *d64, char *string)
 121 {
 122   decNumber dn;                 /* work */
 123   decimal64ToNumber (d64, &dn);
 124   decNumberToEngString (&dn, string);
 125   return string;
 126 }
 127
 128 decimal64 *
 129 decimal64FromString (decimal64 *result, const char *string,
 130                       decContext *set)
 131 {
 132   decContext dc;                /* work */
 133   decNumber dn;                 /* .. */
 134
 135   decContextDefault (&dc, DEC_INIT_DECIMAL64);  /* no traps, please */
 136   dc.round = set->round;        /* use supplied rounding */
 137
 138   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 139   decimal64FromNumber (result, &dn, &dc);
 140   if (dc.status != 0)
 141     {                           /* something happened */
 142       decContextSetStatus (set, dc.status);     /* .. pass it on */
 143     }
 144   return result;
 145 }