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      1 /* $NetBSD: strtorx.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 #define _4 4
     47 #endif
     48 #ifdef IEEE_LITTLE_ENDIAN
     49 #define _0 4
     50 #define _1 3
     51 #define _2 2
     52 #define _3 1
     53 #define _4 0
     54 #endif
     55 
     56  void
     57 #ifdef KR_headers
     58 ULtox(L, bits, expt, k) UShort *L; ULong *bits; Long expt; int k;
     59 #else
     60 ULtox(UShort *L, ULong *bits, Long expt, int k)
     61 #endif
     62 {
     63 	switch(k & STRTOG_Retmask) {
     64 	  case STRTOG_NoNumber:
     65 	  case STRTOG_Zero:
     66 		L[0] = L[1] = L[2] = L[3] = L[4] = 0;
     67 		break;
     68 
     69 	  case STRTOG_Denormal:
     70 		L[_0] = 0;
     71 		goto normal_bits;
     72 
     73 	  case STRTOG_Normal:
     74 	  case STRTOG_NaNbits:
     75 		L[_0] = expt + 0x3fff + 63;
     76  normal_bits:
     77 		L[_4] = (UShort)bits[0];
     78 		L[_3] = (UShort)(bits[0] >> 16);
     79 		L[_2] = (UShort)bits[1];
     80 		L[_1] = (UShort)(bits[1] >> 16);
     81 		break;
     82 
     83 	  case STRTOG_Infinite:
     84 		L[_0] = 0x7fff;
     85 		L[_1] = 0x8000;
     86 		L[_2] = L[_3] = L[_4] = 0;
     87 		break;
     88 
     89 	  case STRTOG_NaN:
     90 		L[0] = ldus_QNAN0;
     91 		L[1] = ldus_QNAN1;
     92 		L[2] = ldus_QNAN2;
     93 		L[3] = ldus_QNAN3;
     94 		L[4] = ldus_QNAN4;
     95 	  }
     96 	if (k & STRTOG_Neg)
     97 		L[_0] |= 0x8000;
     98 	}
     99 
    100  int
    101 #ifdef KR_headers
    102 strtorx(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
    103 #else
    104 strtorx(CONST char *s, char **sp, int rounding, void *L)
    105 #endif
    106 {
    107 	static CONST FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };
    108 	CONST FPI *fpi;
    109 	FPI fpi1;
    110 	ULong bits[2];
    111 	Long expt;
    112 	int k;
    113 
    114 	fpi = &fpi0;
    115 	if (rounding != FPI_Round_near) {
    116 		fpi1 = fpi0;
    117 		fpi1.rounding = rounding;
    118 		fpi = &fpi1;
    119 		}
    120 	k = strtodg(s, sp, fpi, &expt, bits);
    121 	if (k == STRTOG_NoMemory)
    122 		return k;
    123 	    ULtox((UShort*)L, bits, expt, k);
    124 	return k;
    125 	}
    126