mirror of
https://github.com/jart/cosmopolitan.git
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2fc507c98f
* modelines: tw -> sw shiftwidth, not textwidth. * space-surround modelines * fix irregular modelines * Fix modeline in titlegen.c
112 lines
4.6 KiB
C
112 lines
4.6 KiB
C
/*-*- 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 "third_party/gdtoa/gdtoa.internal.h"
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static double
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__gdtoa_ulpdown(U *d)
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{
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double u;
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ULong *L = d->L;
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u = __gdtoa_ulp(d);
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if (!(L[0] | (L[1] & 0xfffff))
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&& (L[1] & 0x7ff00000) > 0x00100000)
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u *= 0.5;
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return u;
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}
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int
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strtodI(const char *s, char **sp, double *dd)
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{
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static const FPI fpi = { 53, 1-1023-53+1, 2046-1023-53+1, 1, SI, 0 /*unused*/ };
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ULong bits[2], sign;
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Long exp;
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int j, k;
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U *u;
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k = strtodg(s, sp, &fpi, &exp, bits);
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u = (U*)dd;
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sign = k & STRTOG_Neg ? 0x80000000L : 0;
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switch(k & STRTOG_Retmask) {
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case STRTOG_NoNumber:
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dval(&u[0]) = dval(&u[1]) = 0.;
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break;
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case STRTOG_Zero:
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dval(&u[0]) = dval(&u[1]) = 0.;
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goto contain;
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case STRTOG_Denormal:
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word1(&u[0]) = bits[0];
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word0(&u[0]) = bits[1];
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goto contain;
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case STRTOG_Normal:
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word1(&u[0]) = bits[0];
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word0(&u[0]) = (bits[1] & ~0x100000) | ((exp + 0x3ff + 52) << 20);
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contain:
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j = k & STRTOG_Inexact;
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if (sign) {
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word0(&u[0]) |= sign;
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j = STRTOG_Inexact - j;
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}
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switch(j) {
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case STRTOG_Inexlo:
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dval(&u[1]) = dval(&u[0]) + __gdtoa_ulp(&u[0]);
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break;
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case STRTOG_Inexhi:
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dval(&u[1]) = dval(&u[0]);
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dval(&u[0]) -= __gdtoa_ulpdown(u);
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break;
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default:
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dval(&u[1]) = dval(&u[0]);
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}
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break;
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case STRTOG_Infinite:
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word0(&u[0]) = word0(&u[1]) = sign | 0x7ff00000;
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word1(&u[0]) = word1(&u[1]) = 0;
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if (k & STRTOG_Inexact) {
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if (sign) {
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word0(&u[1]) = 0xffefffffL;
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word1(&u[1]) = 0xffffffffL;
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}
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else {
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word0(&u[0]) = 0x7fefffffL;
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word1(&u[0]) = 0xffffffffL;
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}
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}
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break;
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case STRTOG_NaN:
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u->L[0] = (u+1)->L[0] = d_QNAN0;
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u->L[1] = (u+1)->L[1] = d_QNAN1;
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break;
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case STRTOG_NaNbits:
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word0(&u[0]) = word0(&u[1]) = 0x7ff00000 | sign | bits[1];
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word1(&u[0]) = word1(&u[1]) = bits[0];
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}
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return k;
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}
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