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strtorx.c revision 1.1 
      1 /* $NetBSD: strtorx.c,v 1.1 2006/01/25 15:18:55 kleink 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_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 #define _4 4
     47 #endif
     48 #ifdef IEEE_8087
     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, exp, k) UShort *L; ULong *bits; Long exp; int k;
     59 #else
     60 ULtox(UShort *L, ULong *bits, Long exp, 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] = exp + 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] = L[_2] = L[_3] = L[_4] = 0;
     86 		break;
     87 
     88 	  case STRTOG_NaN:
     89 		L[0] = ldus_QNAN0;
     90 		L[1] = ldus_QNAN1;
     91 		L[2] = ldus_QNAN2;
     92 		L[3] = ldus_QNAN3;
     93 		L[4] = ldus_QNAN4;
     94 	  }
     95 	if (k & STRTOG_Neg)
     96 		L[_0] |= 0x8000;
     97 	}
     98 
     99  int
    100 #ifdef KR_headers
    101 strtorx(s, sp, rounding, L) CONST char *s; char **sp; int rounding; void *L;
    102 #else
    103 strtorx(CONST char *s, char **sp, int rounding, void *L)
    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(s, sp, fpi, &exp, bits);
    119 	ULtox((UShort*)L, bits, exp, k);
    120 	return k;
    121 	}
    122