2021-08-19 13:07:37 +00:00
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
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│ vi: set noet ft=c ts=8 sw=8 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ The author of this software is David M. Gay. │
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│ Please send bug reports to David M. Gay <dmg@acm.org> │
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│ or Justine Tunney <jtunney@gmail.com> │
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│ │
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│ Copyright (C) 1998, 1999 by Lucent Technologies │
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│ All Rights Reserved │
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│ │
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│ Permission to use, copy, modify, and distribute this software and │
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│ its documentation for any purpose and without fee is hereby │
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│ granted, provided that the above copyright notice appear in all │
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│ copies and that both that the copyright notice and this │
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│ permission notice and warranty disclaimer appear in supporting │
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│ documentation, and that the name of Lucent or any of its entities │
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│ not be used in advertising or publicity pertaining to │
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│ distribution of the software without specific, written prior │
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│ permission. │
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│ │
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│ LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, │
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│ INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. │
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│ IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY │
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│ SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES │
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│ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER │
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│ IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, │
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│ ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF │
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│ THIS SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/runtime/fenv.h"
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2020-12-05 20:20:41 +00:00
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#include "third_party/gdtoa/gdtoa.internal.h"
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2020-12-01 11:43:40 +00:00
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2020-12-27 15:02:35 +00:00
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char *
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2020-12-01 11:43:40 +00:00
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g_ddfmt(char *buf, double *dd0, int ndig, size_t bufsize)
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{
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FPI fpi;
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char *b, *s, *se;
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ULong *L, bits0[4], *bits, *zx;
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int bx, by, decpt, ex, ey, i, j, mode;
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Bigint *x, *y, *z;
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U *dd, ddx[2];
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2022-06-19 08:13:03 +00:00
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ThInfo *TI = 0;
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2020-12-01 11:43:40 +00:00
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if (bufsize < 10 || bufsize < (size_t)(ndig + 8))
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return 0;
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dd = (U*)dd0;
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L = dd->L;
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2021-08-19 13:07:37 +00:00
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if ((L[1] & 0x7ff00000L) == 0x7ff00000L) {
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2020-12-01 11:43:40 +00:00
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/* Infinity or NaN */
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2021-08-19 13:07:37 +00:00
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if (L[1] & 0xfffff || L[0]) {
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nanret:
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return stpcpy(buf, "NaN");
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}
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if ((L[2+1] & 0x7ff00000) == 0x7ff00000) {
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if (L[2+1] & 0xfffff || L[2+0])
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2020-12-01 11:43:40 +00:00
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goto nanret;
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2021-08-19 13:07:37 +00:00
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if ((L[1] ^ L[2+1]) & 0x80000000L)
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2020-12-01 11:43:40 +00:00
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goto nanret; /* Infinity - Infinity */
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2021-08-19 13:07:37 +00:00
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}
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infret:
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2020-12-01 11:43:40 +00:00
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b = buf;
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2021-08-19 13:07:37 +00:00
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if (L[1] & 0x80000000L)
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2020-12-01 11:43:40 +00:00
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*b++ = '-';
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2021-08-19 13:07:37 +00:00
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return stpcpy(b, "Infinity");
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}
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if ((L[2+1] & 0x7ff00000) == 0x7ff00000) {
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2020-12-01 11:43:40 +00:00
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L += 2;
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2021-08-19 13:07:37 +00:00
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if (L[1] & 0xfffff || L[0])
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2020-12-01 11:43:40 +00:00
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goto nanret;
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goto infret;
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2021-08-19 13:07:37 +00:00
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}
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2020-12-01 11:43:40 +00:00
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if (dval(&dd[0]) + dval(&dd[1]) == 0.) {
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b = buf;
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2021-08-19 13:07:37 +00:00
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if (L[1] & L[2+1] & 0x80000000L)
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2020-12-01 11:43:40 +00:00
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*b++ = '-';
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*b++ = '0';
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*b = 0;
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return b;
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2021-08-19 13:07:37 +00:00
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}
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if ((L[1] & 0x7ff00000L) < (L[2+1] & 0x7ff00000L)) {
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2020-12-01 11:43:40 +00:00
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dval(&ddx[1]) = dval(&dd[0]);
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dval(&ddx[0]) = dval(&dd[1]);
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dd = ddx;
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L = dd->L;
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2021-08-19 13:07:37 +00:00
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}
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2022-06-19 08:13:03 +00:00
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z = __gdtoa_d2b(dval(&dd[0]), &ex, &bx, &TI);
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2020-12-01 11:43:40 +00:00
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if (dval(&dd[1]) == 0.)
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goto no_y;
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x = z;
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2022-06-19 08:13:03 +00:00
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y = __gdtoa_d2b(dval(&dd[1]), &ey, &by, &TI);
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2020-12-01 11:43:40 +00:00
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if ( (i = ex - ey) !=0) {
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if (i > 0) {
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2022-06-19 08:13:03 +00:00
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x = __gdtoa_lshift(x, i, &TI);
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2020-12-01 11:43:40 +00:00
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ex = ey;
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}
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2021-08-19 13:07:37 +00:00
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else
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2022-06-19 08:13:03 +00:00
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y = __gdtoa_lshift(y, -i, &TI);
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2021-08-19 13:07:37 +00:00
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}
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if ((L[1] ^ L[2+1]) & 0x80000000L) {
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2022-06-19 08:13:03 +00:00
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z = __gdtoa_diff(x, y, &TI);
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2021-08-19 13:07:37 +00:00
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if (L[1] & 0x80000000L)
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2020-12-01 11:43:40 +00:00
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z->sign = 1 - z->sign;
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2021-08-19 13:07:37 +00:00
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}
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2020-12-01 11:43:40 +00:00
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else {
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2022-06-19 08:13:03 +00:00
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z = __gdtoa_sum(x, y, &TI);
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2021-08-19 13:07:37 +00:00
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if (L[1] & 0x80000000L)
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2020-12-01 11:43:40 +00:00
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z->sign = 1;
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2021-08-19 13:07:37 +00:00
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}
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2022-06-19 08:13:03 +00:00
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__gdtoa_Bfree(x, &TI);
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__gdtoa_Bfree(y, &TI);
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2021-08-19 13:07:37 +00:00
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no_y:
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2020-12-01 11:43:40 +00:00
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bits = zx = z->x;
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for(i = 0; !*zx; zx++)
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i += 32;
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i += lo0bits(zx);
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if (i) {
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2021-10-14 00:27:13 +00:00
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__gdtoa_rshift(z, i);
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2020-12-01 11:43:40 +00:00
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ex += i;
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2021-08-19 13:07:37 +00:00
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}
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2020-12-01 11:43:40 +00:00
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fpi.nbits = z->wds * 32 - hi0bits(z->x[j = z->wds-1]);
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if (fpi.nbits < 106) {
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fpi.nbits = 106;
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if (j < 3) {
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for(i = 0; i <= j; i++)
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bits0[i] = bits[i];
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while(i < 4)
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bits0[i++] = 0;
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bits = bits0;
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}
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2021-08-19 13:07:37 +00:00
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}
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2020-12-01 11:43:40 +00:00
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mode = 2;
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if (ndig <= 0) {
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if (bufsize < (size_t)(fpi.nbits * .301029995664) + 10) {
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2022-06-19 08:13:03 +00:00
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__gdtoa_Bfree(z, &TI);
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2020-12-01 11:43:40 +00:00
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return 0;
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}
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2021-08-19 13:07:37 +00:00
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mode = 0;
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}
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2020-12-01 11:43:40 +00:00
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fpi.emin = 1-1023-53+1;
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fpi.emax = 2046-1023-106+1;
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2021-08-19 13:07:37 +00:00
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fpi.rounding = FLT_ROUNDS;
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2020-12-01 11:43:40 +00:00
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fpi.sudden_underflow = 0;
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fpi.int_max = Int_max;
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i = STRTOG_Normal;
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s = gdtoa(&fpi, ex, bits, &i, mode, ndig, &decpt, &se);
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2021-10-14 00:27:13 +00:00
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b = __gdtoa_g__fmt(buf, s, se, decpt, z->sign, bufsize);
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2022-06-19 08:13:03 +00:00
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__gdtoa_Bfree(z, &TI);
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2020-12-01 11:43:40 +00:00
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return b;
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2021-08-19 13:07:37 +00:00
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}
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