mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-23 03:06:48 +00:00
559a218c9b
These sys/cdefs.h are not needed. Purge them. They are mostly left-over from the $FreeBSD$ removal. A few in libc are still required for macros that cdefs.h defines. Keep those. Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D42385
177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* Copyright (c) 2004-2008 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 <float.h>
|
|
#include <limits.h>
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
|
|
#ifdef __i386__
|
|
#include <ieeefp.h>
|
|
#endif
|
|
|
|
#include "../stdio/floatio.h"
|
|
#include "fpmath.h"
|
|
#include "gdtoaimp.h"
|
|
|
|
#if (LDBL_MANT_DIG > DBL_MANT_DIG)
|
|
|
|
/* Strings values used by dtoa() */
|
|
#define INFSTR "Infinity"
|
|
#define NANSTR "NaN"
|
|
|
|
#ifdef LDBL_IMPLICIT_NBIT
|
|
#define MANH_SIZE LDBL_MANH_SIZE
|
|
#else
|
|
#define MANH_SIZE (LDBL_MANH_SIZE - 1)
|
|
#endif
|
|
|
|
#if MANH_SIZE > 32
|
|
typedef uint64_t manh_t;
|
|
#else
|
|
typedef uint32_t manh_t;
|
|
#endif
|
|
|
|
#if LDBL_MANL_SIZE > 32
|
|
typedef uint64_t manl_t;
|
|
#else
|
|
typedef uint32_t manl_t;
|
|
#endif
|
|
|
|
#define LDBL_ADJ (LDBL_MAX_EXP - 2)
|
|
#define SIGFIGS ((LDBL_MANT_DIG + 3) / 4 + 1)
|
|
|
|
static const float one[] = { 1.0f, -1.0f };
|
|
|
|
/*
|
|
* This is the long double version of __hdtoa().
|
|
*/
|
|
char *
|
|
__hldtoa(long double e, const char *xdigs, int ndigits, int *decpt, int *sign,
|
|
char **rve)
|
|
{
|
|
union IEEEl2bits u;
|
|
char *s, *s0;
|
|
manh_t manh;
|
|
manl_t manl;
|
|
int bufsize;
|
|
#ifdef __i386__
|
|
fp_prec_t oldprec;
|
|
#endif
|
|
|
|
u.e = e;
|
|
*sign = u.bits.sign;
|
|
|
|
switch (fpclassify(e)) {
|
|
case FP_NORMAL:
|
|
*decpt = u.bits.exp - LDBL_ADJ;
|
|
break;
|
|
case FP_ZERO:
|
|
*decpt = 1;
|
|
return (nrv_alloc("0", rve, 1));
|
|
case FP_SUBNORMAL:
|
|
#ifdef __i386__
|
|
oldprec = fpsetprec(FP_PE);
|
|
#endif
|
|
u.e *= 0x1p514L;
|
|
*decpt = u.bits.exp - (514 + LDBL_ADJ);
|
|
#ifdef __i386__
|
|
fpsetprec(oldprec);
|
|
#endif
|
|
break;
|
|
case FP_INFINITE:
|
|
*decpt = INT_MAX;
|
|
return (nrv_alloc(INFSTR, rve, sizeof(INFSTR) - 1));
|
|
default: /* FP_NAN or unrecognized */
|
|
*decpt = INT_MAX;
|
|
return (nrv_alloc(NANSTR, rve, sizeof(NANSTR) - 1));
|
|
}
|
|
|
|
/* FP_NORMAL or FP_SUBNORMAL */
|
|
|
|
if (ndigits == 0) /* dtoa() compatibility */
|
|
ndigits = 1;
|
|
|
|
/*
|
|
* If ndigits < 0, we are expected to auto-size, so we allocate
|
|
* enough space for all the digits.
|
|
*/
|
|
bufsize = (ndigits > 0) ? ndigits : SIGFIGS;
|
|
s0 = rv_alloc(bufsize);
|
|
|
|
/* Round to the desired number of digits. */
|
|
if (SIGFIGS > ndigits && ndigits > 0) {
|
|
float redux = one[u.bits.sign];
|
|
int offset = 4 * ndigits + LDBL_MAX_EXP - 4 - LDBL_MANT_DIG;
|
|
#ifdef __i386__
|
|
oldprec = fpsetprec(FP_PE);
|
|
#endif
|
|
u.bits.exp = offset;
|
|
u.e += redux;
|
|
u.e -= redux;
|
|
*decpt += u.bits.exp - offset;
|
|
#ifdef __i386__
|
|
fpsetprec(oldprec);
|
|
#endif
|
|
}
|
|
|
|
mask_nbit_l(u);
|
|
manh = u.bits.manh;
|
|
manl = u.bits.manl;
|
|
*s0 = '1';
|
|
for (s = s0 + 1; s < s0 + bufsize; s++) {
|
|
*s = xdigs[(manh >> (MANH_SIZE - 4)) & 0xf];
|
|
manh = (manh << 4) | (manl >> (LDBL_MANL_SIZE - 4));
|
|
manl <<= 4;
|
|
}
|
|
|
|
/* If ndigits < 0, we are expected to auto-size the precision. */
|
|
if (ndigits < 0) {
|
|
for (ndigits = SIGFIGS; s0[ndigits - 1] == '0'; ndigits--)
|
|
;
|
|
}
|
|
|
|
s = s0 + ndigits;
|
|
*s = '\0';
|
|
if (rve != NULL)
|
|
*rve = s;
|
|
return (s0);
|
|
}
|
|
|
|
#else /* (LDBL_MANT_DIG == DBL_MANT_DIG) */
|
|
|
|
char *
|
|
__hldtoa(long double e, const char *xdigs, int ndigits, int *decpt, int *sign,
|
|
char **rve)
|
|
{
|
|
|
|
return (__hdtoa((double)e, xdigs, ndigits, decpt, sign, rve));
|
|
}
|
|
|
|
#endif /* (LDBL_MANT_DIG == DBL_MANT_DIG) */
|