contrib/gdtoa/strtorQ.c

   1 /****************************************************************
   2
   3 The author of this software is David M. Gay.
   4
   5 Copyright (C) 1998, 2000 by Lucent Technologies
   6 All Rights Reserved
   7
   8 Permission to use, copy, modify, and distribute this software and
   9 its documentation for any purpose and without fee is hereby
  10 granted, provided that the above copyright notice appear in all
  11 copies and that both that the copyright notice and this
  12 permission notice and warranty disclaimer appear in supporting
  13 documentation, and that the name of Lucent or any of its entities
  14 not be used in advertising or publicity pertaining to
  15 distribution of the software without specific, written prior
  16 permission.
  17
  18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
  20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
  21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
  25 THIS SOFTWARE.
  26
  27 ****************************************************************/
  28
  29 /* Please send bug reports to David M. Gay (dmg at acm dot org,
  30  * with " at " changed at "@" and " dot " changed to ".").      */
  31
  32 /* $FreeBSD: head/contrib/gdtoa/strtorQ.c 227753 2011-11-20 14:45:42Z theraven $ */
  33
  34 #include "gdtoaimp.h"
  35
  36 #undef _0
  37 #undef _1
  38
  39 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
  40
  41 #ifdef IEEE_MC68k
  42 #define _0 0
  43 #define _1 1
  44 #define _2 2
  45 #define _3 3
  46 #endif
  47 #ifdef IEEE_8087
  48 #define _0 3
  49 #define _1 2
  50 #define _2 1
  51 #define _3 0
  52 #endif
  53
  54  void
  55 #ifdef KR_headers
  56 ULtoQ(L, bits, exp, k) ULong *L; ULong *bits; Long exp; int k;
  57 #else
  58 ULtoQ(ULong *L, ULong *bits, Long exp, int k)
  59 #endif
  60 {
  61         switch(k & STRTOG_Retmask) {
  62           case STRTOG_NoNumber:
  63           case STRTOG_Zero:
  64                 L[0] = L[1] = L[2] = L[3] = 0;
  65                 break;
  66
  67           case STRTOG_Normal:
  68                 L[_3] = bits[0];
  69                 L[_2] = bits[1];
  70                 L[_1] = bits[2];
  71                 L[_0] = (bits[3] & ~0x10000) | ((exp + 0x3fff + 112) << 16);
  72                 break;
  73
  74           case STRTOG_NaNbits:
  75                 L[_3] = bits[0];
  76                 L[_2] = bits[1];
  77                 L[_1] = bits[2];
  78                 L[_0] = (bits[3] & ~0x10000)
  79                     | (((exp + 0x3fff + 112) << 16) | (1 << 15));
  80                 break;
  81
  82           case STRTOG_Denormal:
  83                 L[_3] = bits[0];
  84                 L[_2] = bits[1];
  85                 L[_1] = bits[2];
  86                 L[_0] = bits[3];
  87                 break;
  88
  89           case STRTOG_Infinite:
  90                 L[_0] = 0x7fff0000;
  91                 L[_1] = L[_2] = L[_3] = 0;
  92                 break;
  93
  94           case STRTOG_NaN:
  95                 L[0] = ld_QNAN0;
  96                 L[1] = ld_QNAN1;
  97                 L[2] = ld_QNAN2;
  98                 L[3] = ld_QNAN3;
  99           }
 100         if (k & STRTOG_Neg)
 101                 L[_0] |= 0x80000000L;
 102         }
 103
 104  int
 105 #ifdef KR_headers
 106 strtorQ_l(s, sp, rounding, L, locale) CONST char *s; char **sp; int rounding;
 107 void *L; locale_t locale;
 108 #else
 109 strtorQ_l(CONST char *s, char **sp, int rounding, void *L, locale_t locale)
 110 #endif
 111 {
 112         static FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI };
 113         FPI *fpi, fpi1;
 114         ULong bits[4];
 115         Long exp;
 116         int k;
 117
 118         fpi = &fpi0;
 119         if (rounding != FPI_Round_near) {
 120                 fpi1 = fpi0;
 121                 fpi1.rounding = rounding;
 122                 fpi = &fpi1;
 123                 }
 124         k = strtodg_l(s, sp, fpi, &exp, bits, locale);
 125         ULtoQ((ULong*)L, bits, exp, k);
 126         return k;
 127         }