2aa62f2bc9
This set of three packages: AppPkg, StdLib, StdLibPrivateInternalFiles; contains the implementation of libraries based upon non-UEFI standards such as ISO/IEC-9899, the library portion of the C Language Standard, POSIX, etc. AppPkg contains applications that make use of the standard libraries defined in the StdLib Package. StdLib contains header (include) files and the implementations of the standard libraries. StdLibPrivateInternalFiles contains files for the exclusive use of the library implementations in StdLib. These files should never be directly referenced from applications or other code. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11600 6f19259b-4bc3-4df7-8a09-765794883524
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/* $NetBSD: ldtoa.c,v 1.4.2.1 2007/05/07 19:49:06 pavel Exp $ */
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/*-
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* Copyright (c) 2003 David Schultz <das@FreeBSD.ORG>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <LibConfig.h>
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#include <sys/EfiCdefs.h>
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#include <float.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <math.h>
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#include <stdlib.h>
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#include <machine/ieee.h>
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#include "gdtoaimp.h"
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#if defined(_MSC_VER)
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/* Disable warnings about conversions to narrower data types,
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primarily for the fpclassify() macro.
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*/
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#pragma warning ( disable : 4244 )
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// Squelch bogus warnings about uninitialized variable use.
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#pragma warning ( disable : 4700 )
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#endif
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/*
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* ldtoa() is a wrapper for gdtoa() that makes it smell like dtoa(),
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* except that the floating point argument is passed by reference.
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* When dtoa() is passed a NaN or infinity, it sets expt to 9999.
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* However, a long double could have a valid exponent of 9999, so we
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* use INT_MAX in ldtoa() instead.
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*/
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char *
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ldtoa(long double *ld, int mode, int ndigits, int *decpt, int *sign, char **rve)
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{
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#ifdef EXT_EXPBITS
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static FPI fpi = {
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LDBL_MANT_DIG, /* nbits */
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LDBL_MIN_EXP - LDBL_MANT_DIG, /* emin */
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LDBL_MAX_EXP - LDBL_MANT_DIG, /* emax */
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FPI_Round_near, /* rounding */
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#ifdef Sudden_Underflow /* unused, but correct anyway */
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1
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#else
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0
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#endif
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};
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int be, kind;
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char *ret;
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union ieee_ext_u u;
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uint32_t bits[(LDBL_MANT_DIG + 31) / 32];
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u.extu_ld = *ld;
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*sign = (int)(u.extu_ext.ext_sign);
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be = (int)(u.extu_ext.ext_exp - (LDBL_MAX_EXP - 1) - (LDBL_MANT_DIG - 1));
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EXT_TO_ARRAY32(u, bits);
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switch (fpclassify(u.extu_ld)) {
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case FP_NORMAL:
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kind = STRTOG_Normal;
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#ifdef LDBL_IMPLICIT_NBIT
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bits[LDBL_MANT_DIG / 32] |= 1 << ((LDBL_MANT_DIG - 1) % 32);
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#endif /* LDBL_IMPLICIT_NBIT */
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break;
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case FP_ZERO:
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kind = STRTOG_Zero;
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break;
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case FP_SUBNORMAL:
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kind = STRTOG_Denormal;
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#ifdef LDBL_IMPLICIT_NBIT
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be++;
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#endif
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break;
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case FP_INFINITE:
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kind = STRTOG_Infinite;
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break;
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case FP_NAN:
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kind = STRTOG_NaN;
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break;
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default:
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abort();
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}
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ret = gdtoa(&fpi, be, (ULong *)bits, &kind, mode, ndigits, decpt, rve);
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if (*decpt == -32768)
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*decpt = INT_MAX;
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return ret;
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#else
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return dtoa((double)*ld, mode, ndigits, decpt, sign, rve);
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#endif
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}
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