mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
82 lines
3.9 KiB
C
82 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
|
|
╚──────────────────────────────────────────────────────────────────────────────╝
|
|
│ │
|
|
│ The author of this software is David M. Gay. │
|
|
│ Please send bug reports to David M. Gay <dmg@acm.org> │
|
|
│ or Justine Tunney <jtunney@gmail.com> │
|
|
│ │
|
|
│ Copyright (C) 1998, 1999 by Lucent Technologies │
|
|
│ All Rights Reserved │
|
|
│ │
|
|
│ Permission to use, copy, modify, and distribute this software and │
|
|
│ its documentation for any purpose and without fee is hereby │
|
|
│ granted, provided that the above copyright notice appear in all │
|
|
│ copies and that both that the copyright notice and this │
|
|
│ permission notice and warranty disclaimer appear in supporting │
|
|
│ documentation, and that the name of Lucent or any of its entities │
|
|
│ not be used in advertising or publicity pertaining to │
|
|
│ distribution of the software without specific, written prior │
|
|
│ permission. │
|
|
│ │
|
|
│ LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, │
|
|
│ INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. │
|
|
│ IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY │
|
|
│ SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES │
|
|
│ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER │
|
|
│ IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, │
|
|
│ ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF │
|
|
│ THIS SOFTWARE. │
|
|
│ │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "third_party/gdtoa/gdtoa.internal.h"
|
|
/* clang-format off */
|
|
|
|
char*
|
|
g_ffmt(char *buf, float *f, int ndig, size_t bufsize)
|
|
{
|
|
static const FPI fpi0 = { 24, 1-127-24+1, 254-127-24+1, 1, 0, 6 };
|
|
char *b, *s, *se;
|
|
ULong bits[1], *L, sign;
|
|
int decpt, ex, i, mode;
|
|
#include "third_party/gdtoa/gdtoa_fltrnds.inc"
|
|
if (ndig < 0)
|
|
ndig = 0;
|
|
if (bufsize < (size_t)(ndig + 10))
|
|
return 0;
|
|
L = (ULong*)f;
|
|
sign = L[0] & 0x80000000L;
|
|
if ((L[0] & 0x7f800000) == 0x7f800000) {
|
|
/* Infinity or NaN */
|
|
if (L[0] & 0x7fffff) {
|
|
return stpcpy(buf, "NaN");
|
|
}
|
|
b = buf;
|
|
if (sign)
|
|
*b++ = '-';
|
|
return stpcpy(b, "Infinity");
|
|
}
|
|
if (*f == 0.) {
|
|
b = buf;
|
|
if (L[0] & 0x80000000L)
|
|
*b++ = '-';
|
|
*b++ = '0';
|
|
*b = 0;
|
|
return b;
|
|
}
|
|
bits[0] = L[0] & 0x7fffff;
|
|
if ( (ex = (L[0] >> 23) & 0xff) !=0)
|
|
bits[0] |= 0x800000;
|
|
else
|
|
ex = 1;
|
|
ex -= 0x7f + 23;
|
|
mode = 2;
|
|
if (ndig <= 0) {
|
|
if (bufsize < 16)
|
|
return 0;
|
|
mode = 0;
|
|
}
|
|
i = STRTOG_Normal;
|
|
s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);
|
|
return g__fmt(buf, s, se, decpt, sign, bufsize);
|
|
}
|