379 lines
9.6 KiB
C++
379 lines
9.6 KiB
C++
/*
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* This file is a part of PikoTools
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* and is distributed under the (new) BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2017-2021, Tomasz Sowa
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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 are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * 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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* * Neither the name Tomasz Sowa nor the names of contributors to this
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* project may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef headerfile_picotools_convert_strtoint
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#define headerfile_picotools_convert_strtoint
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#include <limits>
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#include "text.h"
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#include "misc.h"
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namespace pt
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{
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template<typename CharType>
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unsigned long long Toull(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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unsigned long long res = 0;
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bool carry = false;
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int digit;
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SetOverflow(was_overflow, false);
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if( allow_skip_whitechars )
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str = skip_white(str);
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while( !carry && is_digit(*str, base, &digit) )
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{
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#ifdef __GNUC__
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carry = __builtin_mul_overflow(res, static_cast<unsigned long long>(base), &res);
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if( !carry )
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{
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carry = __builtin_add_overflow(res, static_cast<unsigned long long>(digit), &res);
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}
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#else
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// on other compilers than GCC or CLANG we do not test overflow at the moment
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res = res * static_cast<unsigned long long>(base) + static_cast<unsigned long long>(digit);
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#endif
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str += 1;
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}
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if( carry )
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{
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if( after_str )
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{
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while( is_digit(*str, base, &digit) )
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{
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str += 1;
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}
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}
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SetOverflow(was_overflow, true);
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res = 0;
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}
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if( after_str )
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*after_str = str;
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return res;
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}
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template<typename CharType>
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long long Toll(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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bool was_sign = false;
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bool was_overflow_u = false;
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SetOverflow(was_overflow, false);
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if( allow_skip_whitechars )
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str = skip_white(str);
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if( *str == '-' )
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{
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was_sign = true;
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str += 1;
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}
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unsigned long long uval = Toull(str, base, after_str, &was_overflow_u, false);
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unsigned long long sign_add = ( was_sign ) ? 1 : 0;
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if( was_overflow_u )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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if( uval > static_cast<unsigned long long>(std::numeric_limits<long long>::max()) + sign_add )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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if( was_sign )
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{
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return static_cast<long long>(0) - static_cast<long long>(uval);
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}
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return static_cast<long long>(uval);
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}
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template<typename CharType, typename IntegerType>
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IntegerType ToUnsignedIntegerType(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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bool was_overflow_ll = false;
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SetOverflow(was_overflow, false);
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unsigned long long val = Toull(str, base, after_str, &was_overflow_ll, allow_skip_whitechars);
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if( was_overflow_ll || val > static_cast<unsigned long long>(std::numeric_limits<IntegerType>::max()) )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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return static_cast<IntegerType>(val);
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}
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template<class CharType>
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unsigned long Toul(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToUnsignedIntegerType<CharType, unsigned long>(str, base, after_str, was_overflow, allow_skip_whitechars);
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}
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template<class CharType>
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unsigned int Toui(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToUnsignedIntegerType<CharType, unsigned int>(str, base, after_str, was_overflow, allow_skip_whitechars);
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}
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template<typename CharType, typename IntegerType>
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IntegerType ToIntegerType(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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bool was_overflow_ll = false;
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SetOverflow(was_overflow, false);
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long long val = Toll(str, base, after_str, &was_overflow_ll, allow_skip_whitechars);
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if( was_overflow_ll ||
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val < static_cast<long long>(std::numeric_limits<IntegerType>::min()) ||
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val > static_cast<long long>(std::numeric_limits<IntegerType>::max()) )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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return static_cast<IntegerType>(val);
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}
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template<class CharType>
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long Tol(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToIntegerType<CharType, long>(str, base, after_str, was_overflow, allow_skip_whitechars);
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}
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template<class CharType>
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int Toi(const CharType * str, int base = 10, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToIntegerType<CharType, int>(str, base, after_str, was_overflow, allow_skip_whitechars);
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}
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/*
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*
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* the base will be automatically detected
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*
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* (first digit is [1-9]) - base 10
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* 0 - 8
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* # - 16
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* & - 2
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*
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*/
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template<typename CharType>
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unsigned long long Toull_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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if( allow_skip_whitechars )
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str = skip_white(str);
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int base = 10;
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if( *str == '0' )
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{
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base = 8;
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str += 1;
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}
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else
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if( *str == '#' )
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{
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base = 16;
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str += 1;
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}
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else
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if( *str == '&' )
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{
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base = 2;
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str += 1;
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}
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return Toull(str, base, after_str, was_overflow, false);
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}
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template<typename CharType>
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long long Toll_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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bool was_sign = false;
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bool was_overflow_u = false;
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SetOverflow(was_overflow, false);
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if( allow_skip_whitechars )
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str = skip_white(str);
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if( *str == '-' )
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{
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was_sign = true;
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str += 1;
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}
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unsigned long long uval = Toull_b(str, after_str, &was_overflow_u, false);
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unsigned long long sign_add = ( was_sign ) ? 1 : 0;
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if( was_overflow_u )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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if( uval > static_cast<unsigned long long>(std::numeric_limits<long long>::max()) + sign_add )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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if( was_sign )
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{
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return static_cast<long long>(0) - static_cast<long long>(uval);
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}
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return static_cast<long long>(uval);
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}
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template<typename CharType, typename IntegerType>
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IntegerType ToUnsignedIntegerType_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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bool was_overflow_ll = false;
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SetOverflow(was_overflow, false);
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unsigned long long val = Toull_b(str, after_str, &was_overflow_ll, allow_skip_whitechars);
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if( was_overflow_ll || val > static_cast<unsigned long long>(std::numeric_limits<IntegerType>::max()) )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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return static_cast<IntegerType>(val);
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}
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template<class CharType>
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unsigned long Toul_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToUnsignedIntegerType_b<CharType, unsigned long>(str, after_str, was_overflow, allow_skip_whitechars);
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}
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template<class CharType>
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unsigned int Toui_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToUnsignedIntegerType_b<CharType, unsigned int>(str, after_str, was_overflow, allow_skip_whitechars);
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}
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template<typename CharType, typename IntegerType>
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IntegerType ToIntegerType_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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bool was_overflow_ll = false;
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SetOverflow(was_overflow, false);
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long long val = Toll_b(str, after_str, &was_overflow_ll, allow_skip_whitechars);
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if( was_overflow_ll ||
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val < static_cast<long long>(std::numeric_limits<IntegerType>::min()) ||
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val > static_cast<long long>(std::numeric_limits<IntegerType>::max()) )
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{
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SetOverflow(was_overflow, true);
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return 0;
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}
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return static_cast<IntegerType>(val);
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}
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template<class CharType>
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long Tol_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToIntegerType_b<CharType, long>(str, after_str, was_overflow, allow_skip_whitechars);
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}
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template<class CharType>
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int Toi_b(const CharType * str, const CharType ** after_str = 0, bool * was_overflow = 0, bool allow_skip_whitechars = true)
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{
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return ToIntegerType_b<CharType, int>(str, after_str, was_overflow, allow_skip_whitechars);
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}
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}
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#endif
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