projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9385eb3d A |
1 | /**************************************************************** |
| 2 | ||
| 3 | The author of this software is David M. Gay. | |
| 4 | ||
| 5 | Copyright (C) 1998 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 | ||
| 3d9156a7 A |
29 | /* Please send bug reports to David M. Gay (dmg at acm dot org, |
| 30 | * with " at " changed at "@" and " dot " changed to "."). */ | |
| 9385eb3d A |
31 | |
| 32 | #include "gdtoaimp.h" | |
| 33 | ||
| 34 | int | |
| 35 | #ifdef KR_headers | |
| 36 | strtoIg(s00, se, fpi, exp, B, rvp) CONST char *s00; char **se; FPI *fpi; Long *exp; Bigint **B; int *rvp; | |
| 37 | #else | |
| 38 | strtoIg(CONST char *s00, char **se, FPI *fpi, Long *exp, Bigint **B, int *rvp) | |
| 39 | #endif | |
| 40 | { | |
| 41 | Bigint *b, *b1; | |
| 42 | int i, nb, nw, nw1, rv, rv1, swap; | |
| 43 | unsigned int nb1, nb11; | |
| 44 | Long e1; | |
| 45 | ||
| 46 | b = *B; | |
| 47 | rv = strtodg(s00, se, fpi, exp, b->x); | |
| 48 | if (!(rv & STRTOG_Inexact)) { | |
| 49 | B[1] = 0; | |
| 50 | return *rvp = rv; | |
| 51 | } | |
| 52 | e1 = exp[0]; | |
| 53 | rv1 = rv ^ STRTOG_Inexact; | |
| 54 | b1 = Balloc(b->k); | |
| 55 | Bcopy(b1, b); | |
| 56 | nb = fpi->nbits; | |
| 57 | nb1 = nb & 31; | |
| 58 | nb11 = (nb1 - 1) & 31; | |
| 59 | nw = b->wds; | |
| 60 | nw1 = nw - 1; | |
| 61 | if (rv & STRTOG_Inexlo) { | |
| 62 | swap = 0; | |
| 63 | b1 = increment(b1); | |
| 64 | if (fpi->sudden_underflow | |
| 65 | && (rv & STRTOG_Retmask) == STRTOG_Zero) { | |
| 66 | b1->x[0] = 0; | |
| 67 | b1->x[nw1] = 1L << nb11; | |
| 68 | rv1 += STRTOG_Normal - STRTOG_Zero; | |
| 69 | rv1 &= ~STRTOG_Underflow; | |
| 70 | goto swapcheck; | |
| 71 | } | |
| 72 | if (b1->wds > nw | |
| 73 | || nb1 && b1->x[nw1] & 1L << nb1) { | |
| 74 | if (++e1 > fpi->emax) | |
| 75 | rv1 = STRTOG_Infinite | STRTOG_Inexhi; | |
| 76 | rshift(b1, 1); | |
| 77 | } | |
| 78 | else if ((rv & STRTOG_Retmask) == STRTOG_Denormal) { | |
| 79 | if (b1->x[nw1] & 1L << nb11) { | |
| 80 | rv1 += STRTOG_Normal - STRTOG_Denormal; | |
| 81 | rv1 &= ~STRTOG_Underflow; | |
| 82 | } | |
| 83 | } | |
| 84 | } | |
| 85 | else { | |
| 86 | swap = STRTOG_Neg; | |
| 87 | if ((rv & STRTOG_Retmask) == STRTOG_Infinite) { | |
| 88 | b1 = set_ones(b1, nb); | |
| 89 | e1 = fpi->emax; | |
| 90 | rv1 = STRTOG_Normal | STRTOG_Inexlo; | |
| 91 | goto swapcheck; | |
| 92 | } | |
| 93 | decrement(b1); | |
| 94 | if ((rv & STRTOG_Retmask) == STRTOG_Denormal) { | |
| 95 | for(i = nw1; !b1->x[i]; --i) | |
| 96 | if (!i) { | |
| 97 | rv1 = STRTOG_Zero | STRTOG_Inexlo; | |
| 98 | break; | |
| 99 | } | |
| 100 | goto swapcheck; | |
| 101 | } | |
| 102 | if (!(b1->x[nw1] & 1L << nb11)) { | |
| 103 | if (e1 == fpi->emin) { | |
| 104 | if (fpi->sudden_underflow) | |
| 105 | rv1 += STRTOG_Zero - STRTOG_Normal; | |
| 106 | else | |
| 107 | rv1 += STRTOG_Denormal - STRTOG_Normal; | |
| 108 | rv1 |= STRTOG_Underflow; | |
| 109 | } | |
| 110 | else { | |
| 111 | b1 = lshift(b1, 1); | |
| 112 | b1->x[0] |= 1; | |
| 113 | --e1; | |
| 114 | } | |
| 115 | } | |
| 116 | } | |
| 117 | swapcheck: | |
| 118 | if (swap ^ (rv & STRTOG_Neg)) { | |
| 119 | rvp[0] = rv1; | |
| 120 | rvp[1] = rv; | |
| 121 | B[0] = b1; | |
| 122 | B[1] = b; | |
| 123 | exp[1] = exp[0]; | |
| 124 | exp[0] = e1; | |
| 125 | } | |
| 126 | else { | |
| 127 | rvp[0] = rv; | |
| 128 | rvp[1] = rv1; | |
| 129 | B[1] = b1; | |
| 130 | exp[1] = e1; | |
| 131 | } | |
| 132 | return rv; | |
| 133 | } |