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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/gdtoa/g_xfmt.c
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/****************************************************************

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The author of this software is David M. Gay.

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Copyright (C) 1998 by Lucent Technologies

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All Rights Reserved

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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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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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/* Please send bug reports to David M. Gay (dmg at acm dot org,

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 * with " at " changed at "@" and " dot " changed to ".").	*/

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#include "gdtoaimp.h"

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#undef _0

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#undef _1

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/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */

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#ifdef IEEE_MC68k

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#define _0 0

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#define _1 1

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#define _2 2

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#define _3 3

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#define _4 4

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#endif

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#ifdef IEEE_8087

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#define _0 4

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#define _1 3

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#define _2 2

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#define _3 1

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#define _4 0

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#endif

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 char*

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#ifdef KR_headers

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g_xfmt(buf, V, ndig, bufsize) char *buf; char *V; int ndig; size_t bufsize;

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#else

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g_xfmt(char *buf, void *V, int ndig, size_t bufsize)

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#endif

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{

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	static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0 };

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	char *b, *s, *se;

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	ULong bits[2], sign;

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	UShort *L;

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	int decpt, ex, i, mode;

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#ifdef Honor_FLT_ROUNDS

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#include "gdtoa_fltrnds.h"

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#else

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#define fpi &fpi0

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#endif

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	if (ndig < 0)

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		ndig = 0;

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	if (bufsize < ndig + 10)

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		return 0;

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	L = (UShort *)V;

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	sign = L[_0] & 0x8000;

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	bits[1] = (L[_1] << 16) | L[_2];

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	bits[0] = (L[_3] << 16) | L[_4];

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	if ( (ex = L[_0] & 0x7fff) !=0) {

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		if (ex == 0x7fff) {

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			/* Infinity or NaN */

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			if (bits[0] | bits[1])

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				b = strcp(buf, "NaN");

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			else {

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				b = buf;

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				if (sign)

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					*b++ = '-';

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				b = strcp(b, "Infinity");

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				}

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			return b;

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			}

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		i = STRTOG_Normal;

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		}

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	else if (bits[0] | bits[1]) {

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		i = STRTOG_Denormal;

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		ex = 1;

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		}

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	else {

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		b = buf;

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#ifndef IGNORE_ZERO_SIGN

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		if (sign)

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			*b++ = '-';

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#endif

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		*b++ = '0';

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		*b = 0;

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		return b;

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		}

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	ex -= 0x3fff + 63;

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	mode = 2;

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	if (ndig <= 0) {

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		if (bufsize < 32)

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			return 0;

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		mode = 0;

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		}

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	s = gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);

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	return g__fmt(buf, s, se, decpt, sign, bufsize);

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	}

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