libdecnumber/bid/decimal32.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 decimal32FromString __dpd32FromString
  29 #define decimal32ToString __dpd32ToString
  30 #define decimal32ToEngString __dpd32ToEngString
  31 #define decimal32FromNumber __dpd32FromNumber
  32 #define decimal32ToNumber __dpd32ToNumber
  33
  34 #include "dpd/decimal32.c"
  35
  36 #undef decimal32FromString
  37 #undef decimal32ToString
  38 #undef decimal32ToEngString
  39 #undef decimal32FromNumber
  40 #undef decimal32ToNumber
  41
  42 #include "bid-dpd.h"
  43
  44 #ifdef IN_LIBGCC2
  45 #define decimal32FromString __decimal32FromString
  46 #define decimal32ToString __decimal32ToString
  47 #define decimal32ToEngString __decimal32ToEngString
  48 #define decimal32FromNumber __decimal32FromNumber
  49 #define decimal32ToNumber __decimal32ToNumber
  50 #endif
  51
  52 decimal32 *decimal32FromString (decimal32 *, const char *, decContext *);
  53 char *decimal32ToString (const decimal32 *, char *);
  54 char *decimal32ToEngString (const decimal32 *, char *);
  55 decimal32 *decimal32FromNumber (decimal32 *, const decNumber *, decContext *);
  56 decNumber *decimal32ToNumber (const decimal32 *, decNumber *);
  57
  58 void __host_to_ieee_32 (_Decimal32 in, decimal32 *out);
  59 void __ieee_to_host_32 (decimal32 in, _Decimal32 *out);
  60
  61 decimal32 *
  62 decimal32FromNumber (decimal32 *d32, const decNumber *dn,
  63                       decContext *set)
  64 {
  65   /* decimal32 and _Decimal32 are different types.  */
  66   union
  67     {
  68       _Decimal32 _Dec;
  69       decimal32 dec;
  70     } u;
  71
  72   __dpd32FromNumber (d32, dn, set);
  73
  74   /* __dpd32FromNumber returns in big endian. But _dpd_to_bid32 takes
  75      host endian. */
  76   __ieee_to_host_32 (*d32, &u._Dec);
  77
  78   /* Convert DPD to BID.  */
  79   _dpd_to_bid32 (&u._Dec, &u._Dec);
  80
  81   /* dfp.c is in bid endian. */
  82   __host_to_ieee_32 (u._Dec, &u.dec);
  83
  84   /* d32 is returned as a pointer to _Decimal32 here.  */
  85   *d32 = u.dec;
  86
  87   return d32;
  88 }
  89
  90 decNumber *
  91 decimal32ToNumber (const decimal32 *bid32, decNumber *dn)
  92 {
  93   /* decimal32 and _Decimal32 are different types.  */
  94   union
  95     {
  96       _Decimal32 _Dec;
  97       decimal32 dec;
  98     } u;
  99
 100   /* bid32 is a pointer to _Decimal32 in bid endian. But _bid_to_dpd32
 101      takes host endian.  */
 102   __ieee_to_host_32 (*bid32, &u._Dec);
 103
 104   /* Convert BID to DPD.  */
 105   _bid_to_dpd32 (&u._Dec, &u._Dec);
 106
 107   /* __dpd32ToNumber is in bid endian.  */
 108   __host_to_ieee_32 (u._Dec, &u.dec);
 109
 110   return __dpd32ToNumber (&u.dec, dn);
 111 }
 112
 113 char *
 114 decimal32ToString (const decimal32 *d32, char *string)
 115 {
 116   decNumber dn;                 /* work */
 117   decimal32ToNumber (d32, &dn);
 118   decNumberToString (&dn, string);
 119   return string;
 120 }
 121
 122 char *
 123 decimal32ToEngString (const decimal32 *d32, char *string)
 124 {
 125   decNumber dn;                 /* work */
 126   decimal32ToNumber (d32, &dn);
 127   decNumberToEngString (&dn, string);
 128   return string;
 129 }
 130
 131 decimal32 *
 132 decimal32FromString (decimal32 *result, const char *string,
 133                       decContext *set)
 134 {
 135   decContext dc;                /* work */
 136   decNumber dn;                 /* .. */
 137
 138   decContextDefault (&dc, DEC_INIT_DECIMAL32);  /* no traps, please */
 139   dc.round = set->round;        /* use supplied rounding */
 140
 141   decNumberFromString (&dn, string, &dc);       /* will round if needed */
 142   decimal32FromNumber (result, &dn, &dc);
 143   if (dc.status != 0)
 144     {                           /* something happened */
 145       decContextSetStatus (set, dc.status);     /* .. pass it on */
 146     }
 147   return result;
 148 }