625 lines
18 KiB
C++
625 lines
18 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2014 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "mathlib.h"
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#include "errorlogger.h"
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#include <string>
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#include <sstream>
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#include <cstdlib>
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#include <cmath>
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#include <cctype>
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#include <limits>
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MathLib::bigint MathLib::toLongNumber(const std::string &str)
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{
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// hexadecimal numbers:
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if (isHex(str)) {
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if (str[0] == '-') {
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bigint ret = 0;
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std::istringstream istr(str);
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istr >> std::hex >> ret;
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return ret;
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} else {
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unsigned long long ret = 0;
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std::istringstream istr(str);
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istr >> std::hex >> ret;
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return (bigint)ret;
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}
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}
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// octal numbers:
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if (isOct(str)) {
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bigint ret = 0;
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std::istringstream istr(str);
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istr >> std::oct >> ret;
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return ret;
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}
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// binary numbers:
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if (isBin(str)) {
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bigint ret = 0;
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for (std::string::size_type i = str[0] == '0'?2:3; i < str.length(); i++) {
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ret <<= 1;
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if (str[i] == '1')
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ret |= 1;
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}
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if (str[0] == '-')
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ret = -ret;
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return ret;
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}
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if (isFloat(str))
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return static_cast<bigint>(std::atof(str.c_str()));
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bigint ret = 0;
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std::istringstream istr(str);
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istr >> ret;
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return ret;
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}
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double MathLib::toDoubleNumber(const std::string &str)
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{
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if (isHex(str))
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return static_cast<double>(toLongNumber(str));
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// nullcheck
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else if (isNullValue(str))
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return 0.0;
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// otherwise, convert to double
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std::istringstream istr(str);
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double ret;
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istr >> ret;
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return ret;
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}
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template<> std::string MathLib::toString(double value)
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{
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std::ostringstream result;
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result.precision(12);
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result << value;
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if (result.str() == "-0")
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return "0.0";
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if (result.str().find(".") == std::string::npos)
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return result.str() + ".0";
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return result.str();
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}
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bool MathLib::isFloat(const std::string &s)
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{
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if (s.empty())
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return false;
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enum {START, BASE_PLUSMINUS, BASE_DIGITS1, LEADING_DECIMAL, TRAILING_DECIMAL, BASE_DIGITS2, E, MANTISSA_PLUSMINUS, MANTISSA_DIGITS, F} state = START;
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for (std::string::const_iterator it = s.begin(); it != s.end(); ++it) {
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switch (state) {
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case START:
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if (*it=='+' || *it=='-')
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state=BASE_PLUSMINUS;
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else if (*it=='.')
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state=LEADING_DECIMAL;
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else if (std::isdigit(*it))
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state=BASE_DIGITS1;
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else
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return false;
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break;
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case BASE_PLUSMINUS:
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if (*it=='.')
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state=LEADING_DECIMAL;
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else if (std::isdigit(*it))
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state=BASE_DIGITS1;
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else if (*it=='e' || *it=='E')
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state=E;
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else
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return false;
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break;
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case LEADING_DECIMAL:
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if (std::isdigit(*it))
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state=BASE_DIGITS2;
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else if (*it=='e' || *it=='E')
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state=E;
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else
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return false;
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break;
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case BASE_DIGITS1:
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if (*it=='e' || *it=='E')
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state=E;
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else if (*it=='.')
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state=TRAILING_DECIMAL;
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else if (!std::isdigit(*it))
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return false;
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break;
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case TRAILING_DECIMAL:
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if (*it=='e' || *it=='E')
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state=E;
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else if (std::isdigit(*it))
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state=BASE_DIGITS2;
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else
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return false;
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break;
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case BASE_DIGITS2:
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if (*it=='e' || *it=='E')
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state=E;
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else if (*it=='f' || *it=='F')
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state=F;
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else if (!std::isdigit(*it))
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return false;
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break;
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case E:
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if (*it=='+' || *it=='-')
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state=MANTISSA_PLUSMINUS;
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else if (std::isdigit(*it))
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state=MANTISSA_DIGITS;
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else
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return false;
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break;
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case MANTISSA_PLUSMINUS:
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if (!std::isdigit(*it))
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return false;
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else
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state=MANTISSA_DIGITS;
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break;
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case MANTISSA_DIGITS:
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if (*it=='f' || *it=='F')
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state=F;
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else if (!std::isdigit(*it))
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return false;
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break;
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case F:
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return false;
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}
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}
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return (state==BASE_DIGITS2 || state == MANTISSA_DIGITS || state == TRAILING_DECIMAL || state == F);
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}
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bool MathLib::isNegative(const std::string &s)
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{
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// remember position
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std::string::size_type n = 0;
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// eat up whitespace
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while (std::isspace(s[n])) ++n;
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// every negative number has a negative sign
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return (s[n] == '-');
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}
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bool MathLib::isPositive(const std::string &s)
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{
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return !MathLib::isNegative(s);
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}
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/*! \brief Does the string represent an octal number?
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* In case leading or trailing white space is provided, the function
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* returns false.
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* Additional information can be found here:
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* http://gcc.gnu.org/onlinedocs/gcc/Binary-constants.html
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*
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* \param[in] s The string to check. In case the string is empty, the function returns false.
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* \return Return true in case a octal number is provided and false otherwise.
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**/
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bool MathLib::isOct(const std::string& s)
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{
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enum {START, PLUSMINUS, OCTAL_PREFIX, DIGITS} state = START;
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for (std::string::const_iterator it = s.begin(); it != s.end(); ++it) {
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switch (state) {
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case START:
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if (*it == '+' || *it == '-')
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state = PLUSMINUS;
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else if (*it == '0')
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state = OCTAL_PREFIX;
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else
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return false;
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break;
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case PLUSMINUS:
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if (*it == '0')
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state = OCTAL_PREFIX;
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else
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return false;
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break;
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case OCTAL_PREFIX:
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if (isOctalDigit(*it))
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state = DIGITS;
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else
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return false;
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break;
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case DIGITS:
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if (isOctalDigit(*it))
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state = DIGITS;
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else
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return isValidSuffix(it,s.end());
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break;
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default:
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return false;
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}
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}
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return state == DIGITS;
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}
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bool MathLib::isHex(const std::string& s)
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{
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// return false, in case an empty string is provided
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if (s.empty())
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return false;
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enum {START, PLUSMINUS, HEX_PREFIX, DIGIT, DIGITS} state = START;
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for (std::string::const_iterator it = s.begin(); it != s.end(); ++it) {
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switch (state) {
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case START:
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if (*it == '+' || *it == '-')
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state = PLUSMINUS;
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else if (*it == '0')
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state = HEX_PREFIX;
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else
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return false;
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break;
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case PLUSMINUS:
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if (*it == '0')
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state = HEX_PREFIX;
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else
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return false;
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break;
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case HEX_PREFIX:
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if (*it == 'x' || *it == 'X')
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state = DIGIT;
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else
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return false;
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break;
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case DIGIT:
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if (isxdigit(*it))
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state = DIGITS;
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else
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return false;
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break;
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case DIGITS:
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if (isxdigit(*it))
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state = DIGITS;
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else
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return isValidSuffix(it,s.end());
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break;
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default:
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return false;
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}
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}
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return state == DIGITS;
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}
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bool MathLib::isValidSuffix(std::string::const_iterator it, std::string::const_iterator end)
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{
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enum {START, SUFFIX_U, SUFFIX_UL, SUFFIX_ULL, SUFFIX_L, SUFFIX_LU, SUFFIX_LL, SUFFIX_LLU} state = START;
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for (; it != end; ++it) {
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switch (state) {
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case START:
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if (*it == 'u' || *it == 'U')
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state = SUFFIX_U;
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else if (*it == 'l' || *it == 'L')
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state = SUFFIX_L;
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else
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return false;
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break;
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case SUFFIX_U:
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if (*it == 'l' || *it == 'L')
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state = SUFFIX_UL; // UL
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else
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return false;
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break;
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case SUFFIX_UL:
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if (*it == 'l' || *it == 'L')
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state = SUFFIX_ULL; // ULL
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else
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return false;
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break;
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case SUFFIX_L:
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if (*it == 'u' || *it == 'U')
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state = SUFFIX_LU; // LU
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else if (*it == 'l' || *it == 'L')
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state = SUFFIX_LL; // LL
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else
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return false;
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break;
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case SUFFIX_LU:
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return false;
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break;
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case SUFFIX_LL:
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if (*it == 'u' || *it == 'U')
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state = SUFFIX_LLU; // LLU
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else
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return false;
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break;
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default:
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return false;
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}
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}
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return (state == SUFFIX_U) || (state == SUFFIX_L)
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|| (state == SUFFIX_UL) || (state == SUFFIX_LU) || (state == SUFFIX_LL)
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|| (state == SUFFIX_ULL) || (state == SUFFIX_LLU);
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}
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/*! \brief Does the string represent a binary number?
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* In case leading or trailing white space is provided, the function
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* returns false.
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* Additional information can be found here:
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* http://gcc.gnu.org/onlinedocs/gcc/Binary-constants.html
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*
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* \param[in] s The string to check. In case the string is empty, the function returns false.
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* \return Return true in case a binary number is provided and false otherwise.
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**/
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bool MathLib::isBin(const std::string& s)
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{
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enum {START, PLUSMINUS, GNU_BIN_PREFIX, DIGIT, DIGITS} state = START;
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for (std::string::const_iterator it = s.begin(); it != s.end(); ++it) {
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switch (state) {
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case START:
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if (*it == '+' || *it == '-')
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state = PLUSMINUS;
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else if (*it == '0')
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state = GNU_BIN_PREFIX;
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else
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return false;
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break;
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case PLUSMINUS:
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if (*it == '0')
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state = GNU_BIN_PREFIX;
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else
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return false;
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break;
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case GNU_BIN_PREFIX:
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if (*it == 'b' || *it == 'B')
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state = DIGIT;
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else
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return false;
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break;
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case DIGIT:
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if (*it == '0' || *it == '1')
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state = DIGITS;
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else
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return false;
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break;
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case DIGITS:
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if (*it == '0' || *it == '1')
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state = DIGITS;
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else
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return isValidSuffix(it,s.end());
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break;
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default:
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return false;
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}
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}
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return state == DIGITS;
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}
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bool MathLib::isInt(const std::string & s)
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{
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// perform prechecks:
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// ------------------
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// first check, if a point is found, it is an floating point value
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const std::string charsToIndicateAFloat=".eE";
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if (s.find_last_of(charsToIndicateAFloat) != std::string::npos)
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return false;
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// remember position
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unsigned long n = 0;
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// eat up whitespace
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while (std::isspace(s[n])) ++n;
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// determine type
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if (isHex(s) || isOct(s)) {
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return true;
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}
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// check sign
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if (s[n] == '-' || s[n] == '+') ++n;
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// starts with digit
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bool bStartsWithDigit=false;
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while (std::isdigit(s[n])) {
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bStartsWithDigit=true;
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++n;
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}
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while (std::tolower(s[n]) == 'u' || std::tolower(s[n]) == 'l') ++n; // unsigned or long (long)
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if (!bStartsWithDigit)
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return false;
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// eat up whitespace
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while (std::isspace(s[n]))
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++n;
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// if everything goes good, we are at the end of the string and no digits/character
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// is here --> return true, but if something was found e.g. 12E+12AA return false
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return (n >= s.length());
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}
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std::string MathLib::add(const std::string & first, const std::string & second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second)) {
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return toString(toLongNumber(first) + toLongNumber(second));
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}
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double d1 = toDoubleNumber(first);
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double d2 = toDoubleNumber(second);
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int count = 0;
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while (d1 > 100000.0 * d2 && toString(d1+d2)==first && ++count<5)
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d2 *= 10.0;
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while (d2 > 100000.0 * d1 && toString(d1+d2)==second && ++count<5)
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d1 *= 10.0;
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return toString(d1 + d2);
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}
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std::string MathLib::subtract(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second)) {
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return toString(toLongNumber(first) - toLongNumber(second));
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}
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if (first == second)
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return "0.0" ;
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double d1 = toDoubleNumber(first);
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double d2 = toDoubleNumber(second);
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int count = 0;
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while (d1 > 100000.0 * d2 && toString(d1-d2)==first && ++count<5)
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d2 *= 10.0;
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while (d2 > 100000.0 * d1 && toString(d1-d2)==second && ++count<5)
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d1 *= 10.0;
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return toString(d1 - d2);
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}
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std::string MathLib::divide(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second)) {
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const bigint a = toLongNumber(first);
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const bigint b = toLongNumber(second);
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if (a == std::numeric_limits<bigint>::min())
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throw InternalError(0, "Internal Error: Division overflow");
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if (b == 0)
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throw InternalError(0, "Internal Error: Division by zero");
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return toString(toLongNumber(first) / b);
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} else if (second == "0.0") {
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if (first=="0.0" || first=="+0.0")
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return "nan.0";
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if (first=="-0.0")
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return "-nan.0";
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return (first[0] == '-') ? "-inf.0" : "inf.0";
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}
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return toString(toDoubleNumber(first) / toDoubleNumber(second));
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}
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std::string MathLib::multiply(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second)) {
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return toString(toLongNumber(first) * toLongNumber(second));
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}
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return toString(toDoubleNumber(first) * toDoubleNumber(second));
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}
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std::string MathLib::mod(const std::string &first, const std::string &second)
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{
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if (MathLib::isInt(first) && MathLib::isInt(second)) {
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bigint b = toLongNumber(second);
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if (b == 0)
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throw InternalError(0, "Internal Error: Division by zero");
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return toString(toLongNumber(first) % b);
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}
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return toString(std::fmod(toDoubleNumber(first),toDoubleNumber(second)));
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}
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std::string MathLib::calculate(const std::string &first, const std::string &second, char action)
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{
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switch (action) {
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case '+':
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return MathLib::add(first, second);
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case '-':
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return MathLib::subtract(first, second);
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case '*':
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return MathLib::multiply(first, second);
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case '/':
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return MathLib::divide(first, second);
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case '%':
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return MathLib::mod(first, second);
|
|
|
|
case '&':
|
|
return MathLib::toString(MathLib::toLongNumber(first) & MathLib::toLongNumber(second));
|
|
|
|
case '|':
|
|
return MathLib::toString(MathLib::toLongNumber(first) | MathLib::toLongNumber(second));
|
|
|
|
case '^':
|
|
return MathLib::toString(MathLib::toLongNumber(first) ^ MathLib::toLongNumber(second));
|
|
|
|
default:
|
|
throw InternalError(0, std::string("Unexpected action '") + action + "' in MathLib::calculate(). Please report this to Cppcheck developers.");
|
|
}
|
|
}
|
|
|
|
std::string MathLib::sin(const std::string &tok)
|
|
{
|
|
return toString(std::sin(toDoubleNumber(tok)));
|
|
}
|
|
|
|
|
|
std::string MathLib::cos(const std::string &tok)
|
|
{
|
|
return toString(std::cos(toDoubleNumber(tok)));
|
|
}
|
|
|
|
std::string MathLib::tan(const std::string &tok)
|
|
{
|
|
return toString(std::tan(toDoubleNumber(tok)));
|
|
}
|
|
|
|
|
|
std::string MathLib::abs(const std::string &tok)
|
|
{
|
|
return toString(std::abs(toDoubleNumber(tok)));
|
|
}
|
|
|
|
bool MathLib::isEqual(const std::string &first, const std::string &second)
|
|
{
|
|
// this conversion is needed for formatting
|
|
// e.g. if first=0.1 and second=1.0E-1, the direct comparison of the strings would fail
|
|
return toString(toDoubleNumber(first)) == toString(toDoubleNumber(second));
|
|
}
|
|
|
|
bool MathLib::isNotEqual(const std::string &first, const std::string &second)
|
|
{
|
|
return !isEqual(first, second);
|
|
}
|
|
|
|
bool MathLib::isGreater(const std::string &first, const std::string &second)
|
|
{
|
|
return toDoubleNumber(first) > toDoubleNumber(second);
|
|
}
|
|
|
|
bool MathLib::isGreaterEqual(const std::string &first, const std::string &second)
|
|
{
|
|
return toDoubleNumber(first) >= toDoubleNumber(second);
|
|
}
|
|
|
|
bool MathLib::isLess(const std::string &first, const std::string &second)
|
|
{
|
|
return toDoubleNumber(first) < toDoubleNumber(second);
|
|
}
|
|
|
|
bool MathLib::isLessEqual(const std::string &first, const std::string &second)
|
|
{
|
|
return toDoubleNumber(first) <= toDoubleNumber(second);
|
|
}
|
|
|
|
bool MathLib::isNullValue(const std::string &str)
|
|
{
|
|
return (str == "-0" || str == "0" || str == "+0"
|
|
|| str == "-0.0" || str == "0.0" || str == "+0.0"
|
|
|| str == "-0." || str == "+0."
|
|
|| str == "-0E-00" || str == "-0E+00" || str == "+0E+00" || str == "+0E-00"
|
|
|| str == "-0e-00" || str == "-0e+00" || str == "+0e+00" || str == "+0e-00"
|
|
|| str == "-0E-0");
|
|
}
|
|
|
|
bool MathLib::isOctalDigit(char c)
|
|
{
|
|
return (c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7');
|
|
}
|