/* $Id: strformatfloat.cpp 94557 2022-04-11 13:53:21Z vboxsync $ */ /** @file * IPRT - String Formatter, Floating Point Numbers (simple approach). */ /* * Copyright (C) 2010-2022 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP RTLOGGROUP_STRING #include #include "internal/iprt.h" #include #include #include "internal/string.h" /** * Helper for rtStrFormatR80Worker that copies out the resulting string. */ static ssize_t rtStrFormatCopyOutStr(char *pszBuf, size_t cbBuf, const char *pszSrc, size_t cchSrc) { if (cchSrc < cbBuf) { memcpy(pszBuf, pszSrc, cchSrc); pszBuf[cchSrc] = '\0'; return cchSrc; } if (cbBuf) { memcpy(pszBuf, pszSrc, cbBuf - 1); pszBuf[cbBuf - 1] = '\0'; } return VERR_BUFFER_OVERFLOW; } RTDECL(ssize_t) RTStrFormatR32(char *pszBuf, size_t cbBuf, PCRTFLOAT32U pr32Value, signed int cchWidth, signed int cchPrecision, uint32_t fFlags) { RT_NOREF(cchWidth, cchPrecision); /* * Handle some special values that does require any value annotating. */ bool const fSign = pr32Value->s.fSign; if (RTFLOAT32U_IS_ZERO(pr32Value)) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-0")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+0")); if (RTFLOAT32U_IS_INF(pr32Value)) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-Inf")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+Inf")); /* * Output sign first. */ char szTmp[80]; char *pszTmp = szTmp; if (fSign) *pszTmp++ = '-'; else *pszTmp++ = '+'; /* * Normal? */ uint16_t const uExponent = pr32Value->s.uExponent; uint32_t const uFraction = pr32Value->s.uFraction; if (RTFLOAT32U_IS_NORMAL(pr32Value)) { *pszTmp++ = '1'; *pszTmp++ = 'm'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + (RTFLOAT32U_FRACTION_BITS + 3) / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_32BIT); *pszTmp++ = '^'; pszTmp += RTStrFormatNumber(pszTmp, (int32_t)uExponent - RTFLOAT32U_EXP_BIAS, 10, 0, 0, RTSTR_F_ZEROPAD | RTSTR_F_32BIT | RTSTR_F_VALSIGNED); } /* * Subnormal? */ else if (RTFLOAT32U_IS_SUBNORMAL(pr32Value)) { *pszTmp++ = '0'; *pszTmp++ = 'm'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + (RTFLOAT32U_FRACTION_BITS + 3) / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_32BIT); if (fFlags & RTSTR_F_SPECIAL) pszTmp = (char *)memcpy(pszTmp, "[SubN]", 6) + 6; } /* * NaN. */ else { Assert(RTFLOAT32U_IS_NAN(pr32Value)); if (!(fFlags & RTSTR_F_SPECIAL)) return rtStrFormatCopyOutStr(pszBuf, cbBuf, RTFLOAT32U_IS_SIGNALLING_NAN(pr32Value) ? (fSign ? "-SNan[" : "+SNan[") : fSign ? "-QNan[" : "+QNan[", 5); *pszTmp++ = RTFLOAT32U_IS_SIGNALLING_NAN(pr32Value) ? 'S' : 'Q'; *pszTmp++ = 'N'; *pszTmp++ = 'a'; *pszTmp++ = 'N'; *pszTmp++ = '['; *pszTmp++ = '.'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + (RTFLOAT32U_FRACTION_BITS + 3) / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_32BIT); *pszTmp++ = ']'; } return rtStrFormatCopyOutStr(pszBuf, cbBuf, szTmp, pszTmp - &szTmp[0]); } RTDECL(ssize_t) RTStrFormatR64(char *pszBuf, size_t cbBuf, PCRTFLOAT64U pr64Value, signed int cchWidth, signed int cchPrecision, uint32_t fFlags) { RT_NOREF(cchWidth, cchPrecision); /* * Handle some special values that does require any value annotating. */ bool const fSign = pr64Value->s.fSign; if (RTFLOAT64U_IS_ZERO(pr64Value)) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-0")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+0")); if (RTFLOAT64U_IS_INF(pr64Value)) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-Inf")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+Inf")); /* * Output sign first. */ char szTmp[160]; char *pszTmp = szTmp; if (fSign) *pszTmp++ = '-'; else *pszTmp++ = '+'; /* * Normal? */ uint16_t const uExponent = pr64Value->s.uExponent; uint64_t const uFraction = RT_MAKE_U64(pr64Value->s.uFractionLow, pr64Value->s.uFractionHigh); if (RTFLOAT64U_IS_NORMAL(pr64Value)) { *pszTmp++ = '1'; *pszTmp++ = 'm'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + (RTFLOAT64U_FRACTION_BITS + 3) / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT); *pszTmp++ = '^'; pszTmp += RTStrFormatNumber(pszTmp, (int32_t)uExponent - RTFLOAT64U_EXP_BIAS, 10, 0, 0, RTSTR_F_ZEROPAD | RTSTR_F_32BIT | RTSTR_F_VALSIGNED); } /* * Subnormal? */ else if (RTFLOAT64U_IS_SUBNORMAL(pr64Value)) { *pszTmp++ = '0'; *pszTmp++ = 'm'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + (RTFLOAT64U_FRACTION_BITS + 3) / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT); if (fFlags & RTSTR_F_SPECIAL) pszTmp = (char *)memcpy(pszTmp, "[SubN]", 6) + 6; } /* * NaN. */ else { Assert(RTFLOAT64U_IS_NAN(pr64Value)); if (!(fFlags & RTSTR_F_SPECIAL)) return rtStrFormatCopyOutStr(pszBuf, cbBuf, RTFLOAT64U_IS_SIGNALLING_NAN(pr64Value) ? (fSign ? "-SNan[" : "+SNan[") : fSign ? "-QNan[" : "+QNan[", 5); *pszTmp++ = RTFLOAT64U_IS_SIGNALLING_NAN(pr64Value) ? 'S' : 'Q'; *pszTmp++ = 'N'; *pszTmp++ = 'a'; *pszTmp++ = 'N'; *pszTmp++ = '['; *pszTmp++ = '.'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + RTFLOAT64U_FRACTION_BITS / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT); *pszTmp++ = ']'; } return rtStrFormatCopyOutStr(pszBuf, cbBuf, szTmp, pszTmp - &szTmp[0]); } /** * Common worker for RTStrFormatR80 and RTStrFormatR80u2. */ static ssize_t rtStrFormatR80Worker(char *pszBuf, size_t cbBuf, bool const fSign, bool const fInteger, uint64_t const uFraction, uint16_t uExponent, uint32_t fFlags) { char szTmp[160]; /* * Output sign first. */ char *pszTmp = szTmp; if (fSign) *pszTmp++ = '-'; else *pszTmp++ = '+'; /* * Then check for special numbers (indicated by expontent). */ bool fDenormal = false; if (uExponent == 0) { /* Zero? */ if ( !uFraction && !fInteger) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-0")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+0")); fDenormal = true; uExponent = 1; } else if (uExponent == RTFLOAT80U_EXP_MAX) { if (!fInteger) { if (!uFraction) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-PseudoInf")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+PseudoInf")); if (!(fFlags & RTSTR_F_SPECIAL)) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-PseudoNan")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+PseudoNan")); pszTmp = (char *)memcpy(pszTmp, "PseudoNan[", 10) + 10; } else if (!(uFraction & RT_BIT_64(62))) { if (!(uFraction & (RT_BIT_64(62) - 1))) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-Inf")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+Inf")); if (!(fFlags & RTSTR_F_SPECIAL)) return rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("SNan")); pszTmp = (char *)memcpy(pszTmp, "SNan[", 5) + 5; } else { if (!(uFraction & (RT_BIT_64(62) - 1))) return fSign ? rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("-Ind")) : rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("+Ind")); if (!(fFlags & RTSTR_F_SPECIAL)) return rtStrFormatCopyOutStr(pszBuf, cbBuf, RT_STR_TUPLE("QNan")); pszTmp = (char *)memcpy(pszTmp, "QNan[", 5) + 5; } pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + RTFLOAT80U_FRACTION_BITS / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT); *pszTmp++ = ']'; return rtStrFormatCopyOutStr(pszBuf, cbBuf, szTmp, pszTmp - &szTmp[0]); } /* * Format the mantissa and exponent. */ *pszTmp++ = fInteger ? '1' : '0'; *pszTmp++ = 'm'; pszTmp += RTStrFormatNumber(pszTmp, uFraction, 16, 2 + (RTFLOAT80U_FRACTION_BITS + 3) / 4, 0, RTSTR_F_SPECIAL | RTSTR_F_ZEROPAD | RTSTR_F_64BIT); *pszTmp++ = '^'; pszTmp += RTStrFormatNumber(pszTmp, (int32_t)uExponent - RTFLOAT80U_EXP_BIAS, 10, 0, 0, RTSTR_F_ZEROPAD | RTSTR_F_32BIT | RTSTR_F_VALSIGNED); if (fFlags & RTSTR_F_SPECIAL) { if (fDenormal) { if (fInteger) pszTmp = (char *)memcpy(pszTmp, "[PDn]", 5) + 5; else pszTmp = (char *)memcpy(pszTmp, "[Den]", 5) + 5; } else if (!fInteger) pszTmp = (char *)memcpy(pszTmp, "[Unn]", 5) + 5; } return rtStrFormatCopyOutStr(pszBuf, cbBuf, szTmp, pszTmp - &szTmp[0]); } RTDECL(ssize_t) RTStrFormatR80u2(char *pszBuf, size_t cbBuf, PCRTFLOAT80U2 pr80Value, signed int cchWidth, signed int cchPrecision, uint32_t fFlags) { RT_NOREF(cchWidth, cchPrecision); #ifdef RT_COMPILER_GROKS_64BIT_BITFIELDS return rtStrFormatR80Worker(pszBuf, cbBuf, pr80Value->sj64.fSign, pr80Value->sj64.fInteger, pr80Value->sj64.uFraction, pr80Value->sj64.uExponent, fFlags); #else return rtStrFormatR80Worker(pszBuf, cbBuf, pr80Value->sj.fSign, pr80Value->sj.fInteger, RT_MAKE_U64(pr80Value->sj.u32FractionLow, pr80Value->sj.u31FractionHigh), pr80Value->sj.uExponent, fFlags); #endif } RTDECL(ssize_t) RTStrFormatR80(char *pszBuf, size_t cbBuf, PCRTFLOAT80U pr80Value, signed int cchWidth, signed int cchPrecision, uint32_t fFlags) { RT_NOREF(cchWidth, cchPrecision); return rtStrFormatR80Worker(pszBuf, cbBuf, pr80Value->s.fSign, pr80Value->s.uMantissa >> 63, pr80Value->s.uMantissa & (RT_BIT_64(63) - 1), pr80Value->s.uExponent, fFlags); }