libdecnumber/bid/decimal32.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 decimal32FromString __dpd32FromString
  26 #define decimal32ToString __dpd32ToString
  27 #define decimal32ToEngString __dpd32ToEngString
  28 #define decimal32FromNumber __dpd32FromNumber
  29 #define decimal32ToNumber __dpd32ToNumber
  30
  31 #include "dpd/decimal32.c"
  32
  33 #undef decimal32FromString
  34 #undef decimal32ToString
  35 #undef decimal32ToEngString
  36 #undef decimal32FromNumber
  37 #undef decimal32ToNumber
  38
  39 #include "bid-dpd.h"
  40
  41 #ifdef IN_LIBGCC2
  42 #define decimal32FromString __decimal32FromString
  43 #define decimal32ToString __decimal32ToString
  44 #define decimal32ToEngString __decimal32ToEngString
  45 #define decimal32FromNumber __decimal32FromNumber
  46 #define decimal32ToNumber __decimal32ToNumber
  47 #endif
  48
  49 decimal32 *decimal32FromString (decimal32 *, const char *, decContext *);
  50 char *decimal32ToString (const decimal32 *, char *);
  51 char *decimal32ToEngString (const decimal32 *, char *);
  52 decimal32 *decimal32FromNumber (decimal32 *, const decNumber *, decContext *);
  53 decNumber *decimal32ToNumber (const decimal32 *, decNumber *);
  54
  55 void __host_to_ieee_32 (_Decimal32 in, decimal32 *out);
  56 void __ieee_to_host_32 (decimal32 in, _Decimal32 *out);
  57
  58 decimal32 *
  59 decimal32FromNumber (decimal32 *d32, const decNumber *dn,
  60                       decContext *set)
  61 {
  62   /* decimal32 and _Decimal32 are different types.  */
  63   union
  64     {
  65       _Decimal32 _Dec;
  66       decimal32 dec;
  67     } u;
  68
  69   __dpd32FromNumber (d32, dn, set);
  70
  71   /* __dpd32FromNumber returns in big endian. But _dpd_to_bid32 takes
  72      host endian. */
  73   __ieee_to_host_32 (*d32, &u._Dec);
  74
  75   /* Convert DPD to BID.  */
  76   _dpd_to_bid32 (&u._Dec, &u._Dec);
  77
  78   /* dfp.c is in bid endian. */
  79   __host_to_ieee_32 (u._Dec, &u.dec);
  80
  81   /* d32 is returned as a pointer to _Decimal32 here.  */
  82   *d32 = u.dec;
  83
  84   return d32;
  85 }
  86
  87 decNumber *
  88 decimal32ToNumber (const decimal32 *bid32, decNumber *dn)
  89 {
  90   /* decimal32 and _Decimal32 are different types.  */
  91   union
  92     {
  93       _Decimal32 _Dec;
  94       decimal32 dec;
  95     } u;
  96
  97   /* bid32 is a pointer to _Decimal32 in bid endian. But _bid_to_dpd32
  98      takes host endian.  */
  99   __ieee_to_host_32 (*bid32, &u._Dec);
 100
 101   /* Convert BID to DPD.  */
 102   _bid_to_dpd32 (&u._Dec, &u._Dec);
 103
 104   /* __dpd32ToNumber is in bid endian.  */
 105   __host_to_ieee_32 (u._Dec, &u.dec);
 106
 107   return __dpd32ToNumber (&u.dec, dn);
 108 }
 109
 110 char *
 111 decimal32ToString (const decimal32 *d32, char *string)
 112 {
 113   decNumber dn;                 /* work */
 114   decimal32ToNumber (d32, &dn);
 115   decNumberToString (&dn, string);
 116   return string;
 117 }
 118
 119 char *
 120 decimal32ToEngString (const decimal32 *d32, char *string)
 121 {
 122   decNumber dn;                 /* work */
 123   decimal32ToNumber (d32, &dn);
 124   decNumberToEngString (&dn, string);
 125   return string;
 126 }
 127
 128 decimal32 *
 129 decimal32FromString (decimal32 *result, const char *string,
 130                       decContext *set)
 131 {
 132   decContext dc;                /* work */
 133   decNumber dn;                 /* .. */
 134
 135   decContextDefault (&dc, DEC_INIT_DECIMAL32);  /* no traps, please */
 136   dc.round = set->round;        /* use supplied rounding */
 137
 138   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 139   decimal32FromNumber (result, &dn, &dc);
 140   if (dc.status != 0)
 141     {                           /* something happened */
 142       decContextSetStatus (set, dc.status);     /* .. pass it on */
 143     }
 144   return result;
 145 }