projects / apple / libc.git / blame
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|---|---|---|
| 9385eb3d A |
1 | /**************************************************************** |
| 2 | ||
| 3 | The author of this software is David M. Gay. | |
| 4 | ||
| 5 | Copyright (C) 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 | |
| 30 | David M. Gay | |
| 31 | Bell Laboratories, Room 2C-463 | |
| 32 | 600 Mountain Avenue | |
| 33 | Murray Hill, NJ 07974-0636 | |
| 34 | U.S.A. | |
| 35 | dmg@bell-labs.com | |
| 36 | */ | |
| 37 | ||
| 38 | #include "gdtoaimp.h" | |
| 39 | ||
| 40 | static void | |
| 41 | #ifdef KR_headers | |
| 42 | L_shift(x, x1, i) ULong *x; ULong *x1; int i; | |
| 43 | #else | |
| 44 | L_shift(ULong *x, ULong *x1, int i) | |
| 45 | #endif | |
| 46 | { | |
| 47 | int j; | |
| 48 | ||
| 49 | i = 8 - i; | |
| 50 | i <<= 2; | |
| 51 | j = ULbits - i; | |
| 52 | do { | |
| 53 | *x |= x[1] << j; | |
| 54 | x[1] >>= i; | |
| 55 | } while(++x < x1); | |
| 56 | } | |
| 57 | ||
| 58 | int | |
| 59 | #ifdef KR_headers | |
| 60 | hexnan(sp, fpi, x0) | |
| 61 | CONST char **sp; FPI *fpi; ULong *x0; | |
| 62 | #else | |
| 63 | hexnan( CONST char **sp, FPI *fpi, ULong *x0) | |
| 64 | #endif | |
| 65 | { | |
| 66 | ULong c, h, *x, *x1, *xe; | |
| 67 | CONST char *s; | |
| 68 | int havedig, hd0, i, nbits; | |
| 69 | ||
| 70 | if (!hexdig['0']) | |
| 71 | hexdig_init_D2A(); | |
| 72 | nbits = fpi->nbits; | |
| 73 | x = x0 + (nbits >> kshift); | |
| 74 | if (nbits & kmask) | |
| 75 | x++; | |
| 76 | *--x = 0; | |
| 77 | x1 = xe = x; | |
| 78 | havedig = hd0 = i = 0; | |
| 79 | s = *sp; | |
| 80 | while(c = *(CONST unsigned char*)++s) { | |
| 81 | if (!(h = hexdig[c])) { | |
| 82 | if (c <= ' ') { | |
| 83 | if (hd0 < havedig) { | |
| 84 | if (x < x1 && i < 8) | |
| 85 | L_shift(x, x1, i); | |
| 86 | if (x <= x0) { | |
| 87 | i = 8; | |
| 88 | continue; | |
| 89 | } | |
| 90 | hd0 = havedig; | |
| 91 | *--x = 0; | |
| 92 | x1 = x; | |
| 93 | i = 0; | |
| 94 | } | |
| 95 | continue; | |
| 96 | } | |
| 97 | if (/*(*/ c == ')' && havedig) { | |
| 98 | *sp = s + 1; | |
| 99 | break; | |
| 100 | } | |
| 101 | return STRTOG_NaN; | |
| 102 | } | |
| 103 | havedig++; | |
| 104 | if (++i > 8) { | |
| 105 | if (x <= x0) | |
| 106 | continue; | |
| 107 | i = 1; | |
| 108 | *--x = 0; | |
| 109 | } | |
| 110 | *x = (*x << 4) | h & 0xf; | |
| 111 | } | |
| 112 | if (!havedig) | |
| 113 | return STRTOG_NaN; | |
| 114 | if (x < x1 && i < 8) | |
| 115 | L_shift(x, x1, i); | |
| 116 | if (x > x0) { | |
| 117 | x1 = x0; | |
| 118 | do *x1++ = *x++; | |
| 119 | while(x <= xe); | |
| 120 | do *x1++ = 0; | |
| 121 | while(x1 <= xe); | |
| 122 | } | |
| 123 | else { | |
| 124 | /* truncate high-order word if necessary */ | |
| 125 | if ( (i = nbits & (ULbits-1)) !=0) | |
| 126 | *xe &= ((ULong)0xffffffff) >> (ULbits - i); | |
| 127 | } | |
| 128 | for(x1 = xe;; --x1) { | |
| 129 | if (*x1 != 0) | |
| 130 | break; | |
| 131 | if (x1 == x0) { | |
| 132 | *x1 = 1; | |
| 133 | break; | |
| 134 | } | |
| 135 | } | |
| 136 | return STRTOG_NaNbits; | |
| 137 | } |