newlib/libc/stdlib/strtorx.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 #include <_ansi.h>
  33 #include <errno.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include "mprec.h"
  37 #include "gdtoa.h"
  38
  39 #if defined (_HAVE_LONG_DOUBLE) && !defined (_LDBL_EQ_DBL)
  40
  41 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
  42
  43 #ifdef IEEE_MC68k
  44 #define _0 0
  45 #define _1 1
  46 #define _2 2
  47 #define _3 3
  48 #define _4 4
  49 #endif
  50 #ifdef IEEE_8087
  51 #define _0 4
  52 #define _1 3
  53 #define _2 2
  54 #define _3 1
  55 #define _4 0
  56 #endif
  57
  58  void
  59 #ifdef KR_headers
  60 ULtox(L, bits, exp, k) __UShort *L; __ULong *bits; Long exp; int k;
  61 #else
  62 ULtox(__UShort *L, __ULong *bits, Long exp, int k)
  63 #endif
  64 {
  65         switch(k & STRTOG_Retmask) {
  66           case STRTOG_NoNumber:
  67           case STRTOG_Zero:
  68                 L[0] = L[1] = L[2] = L[3] = L[4] = 0;
  69                 break;
  70
  71           case STRTOG_Denormal:
  72                 L[_0] = 0;
  73                 goto normal_bits;
  74
  75           case STRTOG_Normal:
  76           case STRTOG_NaNbits:
  77                 L[_0] = exp + 0x3fff + 63;
  78  normal_bits:
  79                 L[_4] = (__UShort)bits[0];
  80                 L[_3] = (__UShort)(bits[0] >> 16);
  81                 L[_2] = (__UShort)bits[1];
  82                 L[_1] = (__UShort)(bits[1] >> 16);
  83                 break;
  84
  85           case STRTOG_Infinite:
  86                 L[_0] = 0x7fff;
  87                 L[_1] = 0x8000;
  88                 L[_2] = L[_3] = L[_4] = 0;
  89                 break;
  90
  91           case STRTOG_NaN:
  92                 *((long double*)L) = __builtin_nanl ("");
  93           }
  94         if (k & STRTOG_Neg)
  95                 L[_0] |= 0x8000;
  96         }
  97
  98  int
  99 #ifdef KR_headers
 100 _strtorx_l(p, s, sp, rounding, L, loc) struct _reent *p; const char *s; char **sp; int rounding; void *L; locale_t loc;
 101 #else
 102 _strtorx_l(struct _reent *p, const char *s, char **sp, int rounding, void *L,
 103            locale_t loc)
 104 #endif
 105 {
 106         static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
 107         FPI *fpi, fpi1;
 108         __ULong bits[2];
 109         Long exp;
 110         int k;
 111
 112         fpi = &fpi0;
 113         if (rounding != FPI_Round_near) {
 114                 fpi1 = fpi0;
 115                 fpi1.rounding = rounding;
 116                 fpi = &fpi1;
 117                 }
 118         k = _strtodg_l(p, s, sp, fpi, &exp, bits, loc);
 119         ULtox((__UShort*)L, bits, exp, k);
 120         return k;
 121         }
 122
 123 #endif /* _HAVE_LONG_DOUBLE && !_LDBL_EQ_DBL */