git.saurik.com Git - apple/libc.git/blob - gdtoa/FreeBSD/gdtoa-strtopx.c

1 /****************************************************************

3 The author of this software is David M. Gay.

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.

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.

27 ****************************************************************/

29 /* Please send bug reports to David M. Gay (dmg at acm dot org,

30 * with " at " changed at "@" and " dot " changed to "."). */

32 #include "xlocale_private.h"

34 #include "gdtoaimp.h"

36 #undef _0

37 #undef _1

39 /* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */

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

56 int

57 #ifdef KR_headers

 strtopx(s, sp, V, loc) CONST char *s; char **sp; void *V; locale_t loc;

59 #else

 strtopx(CONST char *s, char **sp, void *V, locale_t loc)

61 #endif

62 {

         static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, SI };

64 ULong bits[2];

65 Long exp;

66 int k;

67 UShort *L = (UShort*)V;

68 #ifdef Honor_FLT_ROUNDS

69 #include "gdtoa_fltrnds.h"

70 #else

71 #define fpi &fpi0

72 #endif

         k = strtodg(s, sp, fpi, &exp, bits, loc);

75 switch(k & STRTOG_Retmask) {

76 case STRTOG_NoNumber:

                 L[0] = L[1] = L[2] = L[3] = L[4] = 0;

78 return k; // avoid setting sign

80 case STRTOG_Zero:

                 L[0] = L[1] = L[2] = L[3] = L[4] = 0;

82 break;

84 case STRTOG_Denormal:

85 L[_0] = 0;

86 goto normal_bits;

88 case STRTOG_Normal:

89 case STRTOG_NaNbits:

                 L[_0] = exp + 0x3fff + 63;

91 normal_bits:

                 L[_4] = (UShort)bits[0];

                 L[_3] = (UShort)(bits[0] >> 16);

                 L[_2] = (UShort)bits[1];

                 L[_1] = (UShort)(bits[1] >> 16);

96 break;

98 case STRTOG_Infinite:

99 L[_0] = 0x7fff;

100 L[_1] = 0x8000;

                 L[_2] = L[_3] = L[_4] = 0;

102 break;

103

104 case STRTOG_NaN:

105 L[0] = ldus_QNAN0;

106 L[1] = ldus_QNAN1;

107 L[2] = ldus_QNAN2;

108 L[3] = ldus_QNAN3;

109 L[4] = ldus_QNAN4;

110 }

111 if (k & STRTOG_Neg)

112 L[_0] |= 0x8000;

113 return k;

114 }