1/****************************************************************
  2
  3The author of this software is David M. Gay.
  4
  5Copyright (C) 1998 by Lucent Technologies
  6All Rights Reserved
  7
  8Permission to use, copy, modify, and distribute this software and
  9its documentation for any purpose and without fee is hereby
 10granted, provided that the above copyright notice appear in all
 11copies and that both that the copyright notice and this
 12permission notice and warranty disclaimer appear in supporting
 13documentation, and that the name of Lucent or any of its entities
 14not be used in advertising or publicity pertaining to
 15distribution of the software without specific, written prior
 16permission.
 17
 18LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 19INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
 20IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
 21SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 22WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
 23IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 24ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
 25THIS SOFTWARE.
 26
 27****************************************************************/
 28
 29/* Please send bug reports to David M. Gay (dmg at acm dot org,
 30 * with " at " changed at "@" and " dot " changed to ".").	*/
 31
 32#include "gdtoaimp.h"
 33
 34#undef _0
 35#undef _1
 36
 37/* one or the other of IEEE_MC68k or IEEE_8087 should be #defined */
 38
 39#ifdef IEEE_MC68k
 40#define _0 0
 41#define _1 1
 42#define _2 2
 43#define _3 3
 44#define _4 4
 45#endif
 46#ifdef IEEE_8087
 47#define _0 4
 48#define _1 3
 49#define _2 2
 50#define _3 1
 51#define _4 0
 52#endif
 53
 54char *__g_xfmt (char *buf, void *V, int ndig, size_t bufsize)
 55{
 56	static FPI fpi0 = { 64, 1-16383-64+1, 32766 - 16383 - 64 + 1, 1, 0, Int_max };
 57	char *b, *s, *se;
 58	ULong bits[2], sign;
 59	UShort *L;
 60	int decpt, ex, i, mode;
 61#if defined(__MINGW32__) || defined(__MINGW64__)
 62	int fptype = __fpclassifyl (*(long double*) V);
 63#endif	/* MinGW */
 64#ifdef Honor_FLT_ROUNDS
 65#include "gdtoa_fltrnds.h"
 66#else
 67#define fpi &fpi0
 68#endif
 69
 70	if (ndig < 0)
 71		ndig = 0;
 72	if (bufsize < (size_t)(ndig + 10))
 73		return 0;
 74
 75	L = (UShort *)V;
 76	sign = L[_0] & 0x8000;
 77	ex = L[_0] & 0x7fff;
 78	bits[1] = (L[_1] << 16) | L[_2];
 79	bits[0] = (L[_3] << 16) | L[_4];
 80
 81#if defined(__MINGW32__) || defined(__MINGW64__)
 82	if (fptype & FP_NAN) {
 83		/* NaN or Inf */
 84		if (fptype & FP_NORMAL) {
 85			b = buf;
 86			*b++ = sign ? '-': '+';
 87			strncpy (b, "Infinity", ndig ? ndig : 8);
 88			return (buf + strlen (buf));
 89		}
 90		strncpy (buf, "NaN", ndig ? ndig : 3);
 91		return (buf + strlen (buf));
 92	}
 93	else if (fptype & FP_NORMAL) {
 94		/* Normal or subnormal */
 95		if  (fptype & FP_ZERO) {
 96			i = STRTOG_Denormal;
 97			ex = 1;
 98		}
 99		else
100			i = STRTOG_Normal;
101	}
102#else
103	if (ex != 0) {
104		if (ex == 0x7fff) {
105			/* Infinity or NaN */
106			if (!bits[0] && bits[1]== 0x80000000) {
107				b = buf;
108				if (sign)
109					*b++ = '-';
110				b = strcp(b, "Infinity");
111			}
112			else
113				b = strcp(buf, "NaN");
114			return b;
115		}
116		i = STRTOG_Normal;
117	}
118	else if (bits[0] | bits[1]) {
119		i = STRTOG_Denormal;
120		ex = 1;
121	}
122#endif
123	else {
124	/*	i = STRTOG_Zero; */
125		b = buf;
126#ifndef IGNORE_ZERO_SIGN
127		if (sign)
128			*b++ = '-';
129#endif
130		*b++ = '0';
131		*b = 0;
132		return b;
133	}
134	ex -= 0x3fff + 63;
135	mode = 2;
136	if (ndig <= 0) {
137		if (bufsize < 32)
138			return 0;
139		mode = 0;
140	}
141	s = __gdtoa(fpi, ex, bits, &i, mode, ndig, &decpt, &se);
142	return __g__fmt(buf, s, se, decpt, sign, bufsize);
143}