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strtorQ.c revision 1.4 
      1 /* $NetBSD: strtorQ.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 #define _3 3
     46 #endif
     47 #ifdef IEEE_LITTLE_ENDIAN
     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, expt, k) ULong *L; ULong *bits; Long expt; int k;
     57 #else
     58 ULtoQ(ULong *L, ULong *bits, Long expt, 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 	  case STRTOG_NaNbits:
     69 		L[_3] = bits[0];
     70 		L[_2] = bits[1];
     71 		L[_1] = bits[2];
     72 		L[_0] = (bits[3] & ~0x10000) | ((expt + 0x3fff + 112) << 16);
     73 		break;
     74 
     75 	  case STRTOG_Denormal:
     76 		L[_3] = bits[0];
     77 		L[_2] = bits[1];
     78 		L[_1] = bits[2];
     79 		L[_0] = bits[3];
     80 		break;
     81 
     82 	  case STRTOG_Infinite:
     83 		L[_0] = 0x7fff0000;
     84 		L[_1] = L[_2] = L[_3] = 0;
     85 		break;
     86 
     87 	  case STRTOG_NaN:
     88 		L[0] = ld_QNAN0;
     89 		L[1] = ld_QNAN1;
     90 		L[2] = ld_QNAN2;
     91 		L[3] = ld_QNAN3;
     92 	  }
     93 	if (k & STRTOG_Neg)
     94 		L[_0] |= 0x80000000L;
     95 	}
     96 
     97  int
     98 #ifdef KR_headers
     99 strtorQ(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
    100 #else
    101 strtorQ(CONST char *s, char **sp, int rounding, void *L)
    102 #endif
    103 {
    104 	static FPI fpi0 = { 113, 1-16383-113+1, 32766-16383-113+1, 1, SI };
    105 	FPI *fpi, fpi1;
    106 	ULong bits[4];
    107 	Long expt;
    108 	int k;
    109 
    110 	fpi = &fpi0;
    111 	if (rounding != FPI_Round_near) {
    112 		fpi1 = fpi0;
    113 		fpi1.rounding = rounding;
    114 		fpi = &fpi1;
    115 		}
    116 	k = strtodg(s, sp, fpi, &expt, bits);
    117 	if (k == STRTOG_NoMemory)
    118 		return k;
    119 	ULtoQ((ULong*)L, bits, expt, k);
    120 	return k;
    121 	}
    122