/* $NetBSD: ldtoa.c,v 1.4.2.1 2007/05/07 19:49:06 pavel Exp $ */ /*- * Copyright (c) 2003 David Schultz * 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 #include #include #include #include #include #include #include #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 }