89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/****************************************************************
|
|
|
|
The author of this software is David M. Gay.
|
|
|
|
Copyright (C) 1998 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.
|
|
|
|
****************************************************************/
|
|
|
|
/* Please send bug reports to David M. Gay (dmg at acm dot org,
|
|
* with " at " changed at "@" and " dot " changed to "."). */
|
|
|
|
#include "gdtoaimp.h"
|
|
|
|
char*
|
|
#ifdef KR_headers
|
|
g_ffmt(buf, f, ndig, bufsize) char *buf; float *f; int ndig; unsigned bufsize;
|
|
#else
|
|
g_ffmt(char *buf, float *f, int ndig, unsigned bufsize)
|
|
#endif
|
|
{
|
|
static FPI fpi = { 24, 1-127-24+1, 254-127-24+1, 1, 0 };
|
|
char *b, *s, *se;
|
|
ULong bits[1], *L, sign;
|
|
int decpt, ex, i, mode;
|
|
|
|
if (ndig < 0)
|
|
ndig = 0;
|
|
if (bufsize < ndig + 10)
|
|
return 0;
|
|
|
|
L = (ULong*)f;
|
|
sign = L[0] & 0x80000000L;
|
|
if ((L[0] & 0x7f800000) == 0x7f800000) {
|
|
/* Infinity or NaN */
|
|
if (L[0] & 0x7fffff) {
|
|
return strcp(buf, "NaN");
|
|
}
|
|
b = buf;
|
|
if (sign)
|
|
*b++ = '-';
|
|
return strcp(b, "Infinity");
|
|
}
|
|
if (*f == 0.) {
|
|
b = buf;
|
|
#ifndef IGNORE_ZERO_SIGN
|
|
if (L[0] & 0x80000000L)
|
|
*b++ = '-';
|
|
#endif
|
|
*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);
|
|
}
|