Home | History | Annotate | Line # | Download | only in gdtoa 
      1 /* $NetBSD: strtorxL.c,v 1.4 2011/03/20 23:15:35 christos Exp $ */
      2 
      3 /****************************************************************
      4 
      5 The author of this software is David M. Gay.
      6 
      7 Copyright (C) 1998, 2000 by Lucent Technologies
      8 All Rights Reserved
      9 
     10 Permission to use, copy, modify, and distribute this software and
     11 its documentation for any purpose and without fee is hereby
     12 granted, provided that the above copyright notice appear in all
     13 copies and that both that the copyright notice and this
     14 permission notice and warranty disclaimer appear in supporting
     15 documentation, and that the name of Lucent or any of its entities
     16 not be used in advertising or publicity pertaining to
     17 distribution of the software without specific, written prior
     18 permission.
     19 
     20 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
     21 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
     22 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
     23 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     24 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
     25 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
     26 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
     27 THIS SOFTWARE.
     28 
     29 ****************************************************************/
     30 
     31 /* Please send bug reports to David M. Gay (dmg at acm dot org,
     32  * with " at " changed at "@" and " dot " changed to ".").	*/
     33 
     34 #include "gdtoaimp.h"
     35 
     36 #undef _0
     37 #undef _1
     38 
     39 /* one or the other of IEEE_BIG_ENDIAN or IEEE_LITTLE_ENDIAN should be #defined */
     40 
     41 #ifdef IEEE_BIG_ENDIAN
     42 #define _0 0
     43 #define _1 1
     44 #define _2 2
     45 #endif
     46 #ifdef IEEE_LITTLE_ENDIAN
     47 #define _0 2
     48 #define _1 1
     49 #define _2 0
     50 #endif
     51 
     52  void
     53 #ifdef KR_headers
     54 ULtoxL(L, bits, expt, k) ULong *L; ULong *bits; Long expt; int k;
     55 #else
     56 ULtoxL(ULong *L, ULong *bits, Long expt, int k)
     57 #endif
     58 {
     59 	switch(k & STRTOG_Retmask) {
     60 	  case STRTOG_NoNumber:
     61 	  case STRTOG_Zero:
     62 		L[0] = L[1] = L[2] = 0;
     63 		break;
     64 
     65 	  case STRTOG_Normal:
     66 	  case STRTOG_Denormal:
     67 	  case STRTOG_NaNbits:
     68 		L[_0] = (expt + 0x3fff + 63) << 16;
     69 		L[_1] = bits[1];
     70 		L[_2] = bits[0];
     71 		break;
     72 
     73 	  case STRTOG_Infinite:
     74 		L[_0] = 0x7fff << 16;
     75 		L[_1] = 0x80000000;
     76 		L[_2] = 0;
     77 		break;
     78 
     79 	  case STRTOG_NaN:
     80 		L[0] = ld_QNAN0;
     81 		L[1] = ld_QNAN1;
     82 		L[2] = ld_QNAN2;
     83 	  }
     84 	if (k & STRTOG_Neg)
     85 		L[_0] |= 0x80000000L;
     86 	}
     87 
     88  int
     89 #ifdef KR_headers
     90 strtorxL(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
     91 #else
     92 strtorxL(CONST char *s, char **sp, int rounding, void *L)
     93 #endif
     94 {
     95 	static CONST FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
     96 	CONST FPI *fpi;
     97 	FPI fpi1;
     98 	ULong bits[2];
     99 	Long expt;
    100 	int k;
    101 
    102 	fpi = &fpi0;
    103 	if (rounding != FPI_Round_near) {
    104 		fpi1 = fpi0;
    105 		fpi1.rounding = rounding;
    106 		fpi = &fpi1;
    107 		}
    108 	k = strtodg(s, sp, fpi, &expt, bits);
    109 	if (k == STRTOG_NoMemory)
    110 		return k;
    111 	ULtoxL((ULong*)L, bits, expt, k);
    112 	return k;
    113 	}
    114