zig

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      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 #define _4 4
     45 #endif
     46 #ifdef IEEE_8087
     47 #define _0 4
     48 #define _1 3
     49 #define _2 2
     50 #define _3 1
     51 #define _4 0
     52 #endif
     53 
     54 typedef union lD {
     55 	UShort L[5];
     56 	long double D;
     57 } lD;
     58 
     59 static int __strtopx (const char *s, char **sp, lD *V)
     60 {
     61 	static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI,
     62 			   Int_max };
     63 	ULong bits[2];
     64 	Long expo;
     65 	int k;
     66 	UShort *L = & (V->L[0]);
     67 #ifdef Honor_FLT_ROUNDS
     68 #include "gdtoa_fltrnds.h"
     69 #else
     70 #define fpi &fpi0
     71 #endif
     72 	V->D = 0.0L;
     73 
     74 	k = __strtodg(s, sp, fpi, &expo, bits);
     75 	switch(k & STRTOG_Retmask) {
     76 	  case STRTOG_NoNumber:
     77 	  case STRTOG_Zero:
     78 		L[0] = L[1] = L[2] = L[3] = L[4] = 0;
     79 		break;
     80 
     81 	  case STRTOG_Denormal:
     82 		L[_0] = 0;
     83 		goto normal_bits;
     84 
     85 	  case STRTOG_Normal:
     86 	  case STRTOG_NaNbits:
     87 		L[_0] = expo + 0x3fff + 63;
     88  normal_bits:
     89 		L[_4] = (UShort)bits[0];
     90 		L[_3] = (UShort)(bits[0] >> 16);
     91 		L[_2] = (UShort)bits[1];
     92 		L[_1] = (UShort)(bits[1] >> 16);
     93 		break;
     94 
     95 	  case STRTOG_Infinite:
     96 		L[_0] = 0x7fff;
     97 		L[_1] = 0x8000;
     98 		L[_2] = L[_3] = L[_4] = 0;
     99 		break;
    100 
    101 	  case STRTOG_NaN:
    102 		L[0] = ldus_QNAN0;
    103 		L[1] = ldus_QNAN1;
    104 		L[2] = ldus_QNAN2;
    105 		L[3] = ldus_QNAN3;
    106 		L[4] = ldus_QNAN4;
    107 	}
    108 	if (k & STRTOG_Neg)
    109 		L[_0] |= 0x8000;
    110 	return k;
    111 }
    112 
    113 long double __cdecl
    114 __strtold (const char * __restrict__ src, char ** __restrict__ endptr)
    115 {
    116 	lD ret;
    117 	ret.D = 0.0L;
    118 	__strtopx(src, endptr,  &ret);
    119 	return ret.D;
    120 }
    121 
    122 long double __cdecl
    123 __mingw_strtold (const char * __restrict__ src, char ** __restrict__ endptr)
    124   __attribute__((alias("__strtold")));
    125