libdecnumber/bid/decimal128.c

   1 /* Copyright (C) 2007
   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 2, 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 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, USA.  */
  20
  21 /* As a special exception, if you link this library with other files,
  22    some of which are compiled with GCC, to produce an executable,
  23    this library does not by itself cause the resulting executable
  24    to be covered by the GNU General Public License.
  25    This exception does not however invalidate any other reasons why
  26    the executable file might be covered by the GNU General Public License.  */
  27
  28 #define decimal128FromString __dpd128FromString
  29 #define decimal128ToString __dpd128ToString
  30 #define decimal128ToEngString __dpd128ToEngString
  31 #define decimal128FromNumber __dpd128FromNumber
  32 #define decimal128ToNumber __dpd128ToNumber
  33
  34 #include "dpd/decimal128.c"
  35
  36 #undef decimal128FromString
  37 #undef decimal128ToString
  38 #undef decimal128ToEngString
  39 #undef decimal128FromNumber
  40 #undef decimal128ToNumber
  41
  42 #include "bid-dpd.h"
  43
  44 #ifdef IN_LIBGCC2
  45 #define decimal128FromString __decimal128FromString
  46 #define decimal128ToString __decimal128ToString
  47 #define decimal128ToEngString __decimal128ToEngString
  48 #define decimal128FromNumber __decimal128FromNumber
  49 #define decimal128ToNumber __decimal128ToNumber
  50 #endif
  51
  52 decimal128 *decimal128FromString (decimal128 *, const char *, decContext *);
  53 char *decimal128ToString (const decimal128 *, char *);
  54 char *decimal128ToEngString (const decimal128 *, char *);
  55 decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *);
  56 decNumber *decimal128ToNumber (const decimal128 *, decNumber *);
  57
  58 void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
  59 void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
  60
  61 decimal128 *
  62 decimal128FromNumber (decimal128 *d128, const decNumber *dn,
  63                       decContext *set)
  64 {
  65   /* decimal128 and _Decimal128 are different types.  */
  66   union
  67     {
  68       _Decimal128 _Dec;
  69       decimal128 dec;
  70     } u;
  71
  72   __dpd128FromNumber (d128, dn, set);
  73
  74   /* __dpd128FromNumber returns in big endian. But _dpd_to_bid128 takes
  75      host endian. */
  76   __ieee_to_host_128 (*d128, &u._Dec);
  77
  78   /* Convert DPD to BID.  */
  79   _dpd_to_bid128 (&u._Dec, &u._Dec);
  80
  81   /* dfp.c is in bid endian. */
  82   __host_to_ieee_128 (u._Dec, &u.dec);
  83
  84   /* d128 is returned as a pointer to _Decimal128 here.  */
  85   *d128 = u.dec;
  86
  87   return d128;
  88 }
  89
  90 decNumber *
  91 decimal128ToNumber (const decimal128 *bid128, decNumber *dn)
  92 {
  93   /* decimal128 and _Decimal128 are different types.  */
  94   union
  95     {
  96       _Decimal128 _Dec;
  97       decimal128 dec;
  98     } u;
  99
 100   /* bid128 is a pointer to _Decimal128 in bid endian. But _bid_to_dpd128
 101      takes host endian.  */
 102   __ieee_to_host_128 (*bid128, &u._Dec);
 103
 104   /* Convert BID to DPD.  */
 105   _bid_to_dpd128 (&u._Dec, &u._Dec);
 106
 107   /* __dpd128ToNumber is in bid endian.  */
 108   __host_to_ieee_128 (u._Dec, &u.dec);
 109
 110   return __dpd128ToNumber (&u.dec, dn);
 111 }
 112
 113 char *
 114 decimal128ToString (const decimal128 *d128, char *string)
 115 {
 116   decNumber dn;                 /* work */
 117   decimal128ToNumber (d128, &dn);
 118   decNumberToString (&dn, string);
 119   return string;
 120 }
 121
 122 char *
 123 decimal128ToEngString (const decimal128 *d128, char *string)
 124 {
 125   decNumber dn;                 /* work */
 126   decimal128ToNumber (d128, &dn);
 127   decNumberToEngString (&dn, string);
 128   return string;
 129 }
 130
 131 decimal128 *
 132 decimal128FromString (decimal128 *result, const char *string,
 133                       decContext *set)
 134 {
 135   decContext dc;                /* work */
 136   decNumber dn;                 /* .. */
 137
 138   decContextDefault (&dc, DEC_INIT_DECIMAL128); /* no traps, please */
 139   dc.round = set->round;        /* use supplied rounding */
 140
 141   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 142   decimal128FromNumber (result, &dn, &dc);
 143   if (dc.status != 0)
 144     {                           /* something happened */
 145       decContextSetStatus (set, dc.status);     /* .. pass it on */
 146     }
 147   return result;
 148 }