libdecnumber/bid/decimal32.c

   1 /* Copyright (C) 2007-2024 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 decimal32FromString __dpd32FromString
  25 #define decimal32ToString __dpd32ToString
  26 #define decimal32ToEngString __dpd32ToEngString
  27 #define decimal32FromNumber __dpd32FromNumber
  28 #define decimal32ToNumber __dpd32ToNumber
  29
  30 #include "dpd/decimal32.c"
  31
  32 #undef decimal32FromString
  33 #undef decimal32ToString
  34 #undef decimal32ToEngString
  35 #undef decimal32FromNumber
  36 #undef decimal32ToNumber
  37
  38 #include "bid-dpd.h"
  39
  40 #ifdef IN_LIBGCC2
  41 #define decimal32FromString __decimal32FromString
  42 #define decimal32ToString __decimal32ToString
  43 #define decimal32ToEngString __decimal32ToEngString
  44 #define decimal32FromNumber __decimal32FromNumber
  45 #define decimal32ToNumber __decimal32ToNumber
  46 #endif
  47
  48 decimal32 *decimal32FromString (decimal32 *, const char *, decContext *);
  49 char *decimal32ToString (const decimal32 *, char *);
  50 char *decimal32ToEngString (const decimal32 *, char *);
  51 decimal32 *decimal32FromNumber (decimal32 *, const decNumber *, decContext *);
  52 decNumber *decimal32ToNumber (const decimal32 *, decNumber *);
  53
  54 void __host_to_ieee_32 (_Decimal32 in, decimal32 *out);
  55 void __ieee_to_host_32 (decimal32 in, _Decimal32 *out);
  56
  57 decimal32 *
  58 decimal32FromNumber (decimal32 *d32, const decNumber *dn,
  59                       decContext *set)
  60 {
  61   /* decimal32 and _Decimal32 are different types.  */
  62   union
  63     {
  64       _Decimal32 _Dec;
  65       decimal32 dec;
  66     } u;
  67
  68   __dpd32FromNumber (d32, dn, set);
  69
  70   /* __dpd32FromNumber returns in big endian. But _dpd_to_bid32 takes
  71      host endian. */
  72   __ieee_to_host_32 (*d32, &u._Dec);
  73
  74   /* Convert DPD to BID.  */
  75   _dpd_to_bid32 (&u._Dec, &u._Dec);
  76
  77   /* dfp.c is in bid endian. */
  78   __host_to_ieee_32 (u._Dec, &u.dec);
  79
  80   /* d32 is returned as a pointer to _Decimal32 here.  */
  81   *d32 = u.dec;
  82
  83   return d32;
  84 }
  85
  86 decNumber *
  87 decimal32ToNumber (const decimal32 *bid32, decNumber *dn)
  88 {
  89   /* decimal32 and _Decimal32 are different types.  */
  90   union
  91     {
  92       _Decimal32 _Dec;
  93       decimal32 dec;
  94     } u;
  95
  96   /* bid32 is a pointer to _Decimal32 in bid endian. But _bid_to_dpd32
  97      takes host endian.  */
  98   __ieee_to_host_32 (*bid32, &u._Dec);
  99
 100   /* Convert BID to DPD.  */
 101   _bid_to_dpd32 (&u._Dec, &u._Dec);
 102
 103   /* __dpd32ToNumber is in bid endian.  */
 104   __host_to_ieee_32 (u._Dec, &u.dec);
 105
 106   return __dpd32ToNumber (&u.dec, dn);
 107 }
 108
 109 char *
 110 decimal32ToString (const decimal32 *d32, char *string)
 111 {
 112   decNumber dn;                 /* work */
 113   decimal32ToNumber (d32, &dn);
 114   decNumberToString (&dn, string);
 115   return string;
 116 }
 117
 118 char *
 119 decimal32ToEngString (const decimal32 *d32, char *string)
 120 {
 121   decNumber dn;                 /* work */
 122   decimal32ToNumber (d32, &dn);
 123   decNumberToEngString (&dn, string);
 124   return string;
 125 }
 126
 127 decimal32 *
 128 decimal32FromString (decimal32 *result, const char *string,
 129                       decContext *set)
 130 {
 131   decContext dc;                /* work */
 132   decNumber dn;                 /* .. */
 133
 134   decContextDefault (&dc, DEC_INIT_DECIMAL32);  /* no traps, please */
 135   dc.round = set->round;        /* use supplied rounding */
 136
 137   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 138   decimal32FromNumber (result, &dn, &dc);
 139   if (dc.status != 0)
 140     {                           /* something happened */
 141       decContextSetStatus (set, dc.status);     /* .. pass it on */
 142     }
 143   return result;
 144 }