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strtopQ.c revision 1.1.1.2 
      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 "gdtoaimp.h"
     33 
     34 #undef _0
     35 #undef _1
     36 
     37 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
     38 
     39 #ifdef IEEE_MC68k
     40 #define _0 0
     41 #define _1 1
     42 #define _2 2
     43 #define _3 3
     44 #endif
     45 #ifdef IEEE_8087
     46 #define _0 3
     47 #define _1 2
     48 #define _2 1
     49 #define _3 0
     50 #endif
     51 
     52  int
     53 #ifdef KR_headers
     54 strtopQ(s, sp, V) CONST char *s; char **sp; void *V;
     55 #else
     56 strtopQ(CONST char *s, char **sp, void *V)
     57 #endif
     58 {
     59 	static FPI fpi0 = { 113, 1-16383-113+1, 32766 - 16383 - 113 + 1, 1, SI };
     60 	ULong bits[4];
     61 	Long exp;
     62 	int k;
     63 	ULong *L = (ULong*)V;
     64 #ifdef Honor_FLT_ROUNDS
     65 #include "gdtoa_fltrnds.h"
     66 #else
     67 #define fpi &fpi0
     68 #endif
     69 
     70 	k = strtodg(s, sp, fpi, &exp, bits);
     71 	switch(k & STRTOG_Retmask) {
     72 	  case STRTOG_NoNumber:
     73 	  case STRTOG_Zero:
     74 		L[0] = L[1] = L[2] = L[3] = 0;
     75 		break;
     76 
     77 	  case STRTOG_Normal:
     78 	  case STRTOG_NaNbits:
     79 		L[_3] = bits[0];
     80 		L[_2] = bits[1];
     81 		L[_1] = bits[2];
     82 		L[_0] = (bits[3] & ~0x10000) | ((exp + 0x3fff + 112) << 16);
     83 		break;
     84 
     85 	  case STRTOG_Denormal:
     86 		L[_3] = bits[0];
     87 		L[_2] = bits[1];
     88 		L[_1] = bits[2];
     89 		L[_0] = bits[3];
     90 		break;
     91 
     92 	  case STRTOG_Infinite:
     93 		L[_0] = 0x7fff0000;
     94 		L[_1] = L[_2] = L[_3] = 0;
     95 		break;
     96 
     97 	  case STRTOG_NaN:
     98 		L[0] = ld_QNAN0;
     99 		L[1] = ld_QNAN1;
    100 		L[2] = ld_QNAN2;
    101 		L[3] = ld_QNAN3;
    102 	  }
    103 	if (k & STRTOG_Neg)
    104 		L[_0] |= 0x80000000L;
    105 	return k;
    106 	}
    107