1/**************************************************************** 2 3The author of this software is David M. Gay. 4 5Copyright (C) 1998 by Lucent Technologies 6All Rights Reserved 7 8Permission to use, copy, modify, and distribute this software and 9its documentation for any purpose and without fee is hereby 10granted, provided that the above copyright notice appear in all 11copies and that both that the copyright notice and this 12permission notice and warranty disclaimer appear in supporting 13documentation, and that the name of Lucent or any of its entities 14not be used in advertising or publicity pertaining to 15distribution of the software without specific, written prior 16permission. 17 18LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 19INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. 20IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY 21SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 22WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER 23IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, 24ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF 25THIS 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 int 35#ifdef KR_headers 36strtoIg(s00, se, fpi, exp, B, rvp) CONST char *s00; char **se; FPI *fpi; Long *exp; Bigint **B; int *rvp; 37#else 38strtoIg(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 ((rv & STRTOG_Retmask) == STRTOG_Zero) { 65 if (fpi->sudden_underflow) { 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 rv1 &= STRTOG_Inexlo | STRTOG_Underflow | STRTOG_Zero; 73 rv1 |= STRTOG_Inexhi | STRTOG_Denormal; 74 goto swapcheck; 75 } 76 if (b1->wds > nw 77 || (nb1 && b1->x[nw1] & 1L << nb1)) { 78 if (++e1 > fpi->emax) 79 rv1 = STRTOG_Infinite | STRTOG_Inexhi; 80 rshift(b1, 1); 81 } 82 else if ((rv & STRTOG_Retmask) == STRTOG_Denormal) { 83 if (b1->x[nw1] & 1L << nb11) { 84 rv1 += STRTOG_Normal - STRTOG_Denormal; 85 rv1 &= ~STRTOG_Underflow; 86 } 87 } 88 } 89 else { 90 swap = STRTOG_Neg; 91 if ((rv & STRTOG_Retmask) == STRTOG_Infinite) { 92 b1 = set_ones(b1, nb); 93 e1 = fpi->emax; 94 rv1 = STRTOG_Normal | STRTOG_Inexlo; 95 goto swapcheck; 96 } 97 decrement(b1); 98 if ((rv & STRTOG_Retmask) == STRTOG_Denormal) { 99 for(i = nw1; !b1->x[i]; --i) 100 if (!i) { 101 rv1 = STRTOG_Zero | STRTOG_Inexlo; 102 break; 103 } 104 goto swapcheck; 105 } 106 if (!(b1->x[nw1] & 1L << nb11)) { 107 if (e1 == fpi->emin) { 108 if (fpi->sudden_underflow) 109 rv1 += STRTOG_Zero - STRTOG_Normal; 110 else 111 rv1 += STRTOG_Denormal - STRTOG_Normal; 112 rv1 |= STRTOG_Underflow; 113 } 114 else { 115 b1 = lshift(b1, 1); 116 b1->x[0] |= 1; 117 --e1; 118 } 119 } 120 } 121 swapcheck: 122 if (swap ^ (rv & STRTOG_Neg)) { 123 rvp[0] = rv1; 124 rvp[1] = rv; 125 B[0] = b1; 126 B[1] = b; 127 exp[1] = exp[0]; 128 exp[0] = e1; 129 } 130 else { 131 rvp[0] = rv; 132 rvp[1] = rv1; 133 B[1] = b1; 134 exp[1] = e1; 135 } 136 return rv; 137 } 138