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g_xfmt.c
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g_xfmt.c
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
│ vi: set noet ft=c ts=8 sw=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"
char*
g_xfmt(char *buf, void *V, int ndig, size_t bufsize)
{
static const FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0, Int_max };
char *b, *s, *se;
ULong bits[2], sign;
UShort *L;
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 = (UShort *)V;
sign = L[4] & 0x8000;
bits[1] = ((ULong)L[3] << 16) | L[2];
bits[0] = ((ULong)L[1] << 16) | L[0];
if ( (ex = L[4] & 0x7fff) !=0) {
if (ex == 0x7fff) {
/* Infinity or NaN */
if (!bits[0] && bits[1]== 0x80000000) {
b = buf;
if (sign)
*b++ = '-';
b = stpcpy(b, "Infinity");
}
else
b = stpcpy(buf, "NaN");
return b;
}
i = STRTOG_Normal;
}
else if (bits[0] | bits[1]) {
i = STRTOG_Denormal;
ex = 1;
}
else {
b = buf;
if (sign)
*b++ = '-';
*b++ = '0';
*b = 0;
return b;
}
ex -= 0x3fff + 63;
mode = 2;
if (ndig <= 0) {
if (bufsize < 32)
return 0;
mode = 0;
}
s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);
return __gdtoa_g__fmt(buf, s, se, decpt, sign, bufsize);
}