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/* $NetBSD: ldtoa.c,v 1.4.2.1 2007/05/07 19:49:06 pavel Exp $ */
/*-
* Copyright (c) 2003 David Schultz <das@FreeBSD.ORG>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <LibConfig.h>
#include <sys/EfiCdefs.h>
#include <float.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <machine/ieee.h>
#include "gdtoaimp.h"
#if defined(_MSC_VER)
/* Disable warnings about conversions to narrower data types,
primarily for the fpclassify() macro.
*/
#pragma warning ( disable : 4244 )
// Squelch bogus warnings about uninitialized variable use.
#pragma warning ( disable : 4700 )
#endif
/*
* ldtoa() is a wrapper for gdtoa() that makes it smell like dtoa(),
* except that the floating point argument is passed by reference.
* When dtoa() is passed a NaN or infinity, it sets expt to 9999.
* However, a long double could have a valid exponent of 9999, so we
* use INT_MAX in ldtoa() instead.
*/
char *
ldtoa(long double *ld, int mode, int ndigits, int *decpt, int *sign, char **rve)
{
#ifdef EXT_EXPBITS
static FPI fpi = {
LDBL_MANT_DIG, /* nbits */
LDBL_MIN_EXP - LDBL_MANT_DIG, /* emin */
LDBL_MAX_EXP - LDBL_MANT_DIG, /* emax */
FPI_Round_near, /* rounding */
#ifdef Sudden_Underflow /* unused, but correct anyway */
1
#else
0
#endif
};
int be, kind;
char *ret;
union ieee_ext_u u;
uint32_t bits[(LDBL_MANT_DIG + 31) / 32];
u.extu_ld = *ld;
*sign = (int)(u.extu_ext.ext_sign);
be = (int)(u.extu_ext.ext_exp - (LDBL_MAX_EXP - 1) - (LDBL_MANT_DIG - 1));
EXT_TO_ARRAY32(u, bits);
switch (fpclassify(u.extu_ld)) {
case FP_NORMAL:
kind = STRTOG_Normal;
#ifdef LDBL_IMPLICIT_NBIT
bits[LDBL_MANT_DIG / 32] |= 1 << ((LDBL_MANT_DIG - 1) % 32);
#endif /* LDBL_IMPLICIT_NBIT */
break;
case FP_ZERO:
kind = STRTOG_Zero;
break;
case FP_SUBNORMAL:
kind = STRTOG_Denormal;
#ifdef LDBL_IMPLICIT_NBIT
be++;
#endif
break;
case FP_INFINITE:
kind = STRTOG_Infinite;
break;
case FP_NAN:
kind = STRTOG_NaN;
break;
default:
abort();
}
ret = gdtoa(&fpi, be, (ULong *)bits, &kind, mode, ndigits, decpt, rve);
if (*decpt == -32768)
*decpt = INT_MAX;
return ret;
#else
return dtoa((double)*ld, mode, ndigits, decpt, sign, rve);
#endif
}
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