56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
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#ifndef BOOST_THREAD_DETAIL_STRING_TO_UNSIGNED_HPP_INCLUDED
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#define BOOST_THREAD_DETAIL_STRING_TO_UNSIGNED_HPP_INCLUDED
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// Copyright 2023 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <string>
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#include <climits>
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namespace boost
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{
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namespace thread_detail
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{
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inline bool string_to_unsigned( std::string const& s, unsigned& v )
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{
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v = 0;
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if( s.empty() )
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{
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return false;
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}
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for( char const* p = s.c_str(); *p; ++p )
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{
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unsigned char ch = static_cast<unsigned char>( *p );
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if( ch < '0' || ch > '9' )
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{
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return false;
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}
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if( v > UINT_MAX / 10 )
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{
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return false;
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}
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unsigned q = static_cast<unsigned>( ch - '0' );
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if( v == UINT_MAX / 10 && q > UINT_MAX % 10 )
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{
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return false;
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}
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v = v * 10 + q;
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}
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return true;
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}
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} // namespace thread_detail
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} // namespace boost
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#endif // #ifndef BOOST_THREAD_DETAIL_STRING_TO_UNSIGNED_HPP_INCLUDED
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