104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
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/*
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Copyright (c) 2018 Statoil ASA
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This file is part of the Open Porous Media project (OPM).
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OPM 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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OPM 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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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPM_CHARARRAY_HEADER_HPP
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#define OPM_CHARARRAY_HEADER_HPP
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#include <algorithm>
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#include <array>
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#include <cstring>
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#include <cstddef>
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#include <string>
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namespace Opm { namespace RestartIO { namespace Helpers {
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/// Null-terminated, left adjusted, space padded array of N characters.
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///
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/// Simple container of character data. Exists solely for purpose of
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/// outputting std::string (or types convertible to std::string) as
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/// Fortran-style \code character (len=N) \endcode values.
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///
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/// \tparam N Number of characters.
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template <std::size_t N>
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class CharArrayNullTerm
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{
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public:
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CharArrayNullTerm()
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{
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this->clear();
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}
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explicit CharArrayNullTerm(const std::string& s)
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: CharArrayNullTerm()
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{
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this->copy_in(s.c_str(), s.size());
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}
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~CharArrayNullTerm() = default;
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CharArrayNullTerm(const CharArrayNullTerm& rhs) = default;
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CharArrayNullTerm(CharArrayNullTerm&& rhs) = default;
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CharArrayNullTerm& operator=(const CharArrayNullTerm& rhs) = default;
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CharArrayNullTerm& operator=(CharArrayNullTerm&& rhs) = default;
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/// Assign from \code std::string \endcode.
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CharArrayNullTerm& operator=(const std::string& s)
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{
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this->clear();
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this->copy_in(s.data(), s.size());
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return *this;
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}
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const char* c_str() const
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{
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return this->s_.data();
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}
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private:
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enum : typename std::array<char, N + 1>::size_type { NChar = N };
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std::array<char, NChar + 1> s_;
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/// Clear contents of internal array (fill with ' ').
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void clear()
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{
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this->s_.fill(' ');
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this->s_[NChar] = '\0';
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}
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/// Assign new value to internal array (left adjusted, space padded
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/// and null-terminated).
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void copy_in(const char* s,
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const typename std::array<char, NChar + 1>::size_type len)
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{
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const auto ncpy = std::min(len, static_cast<decltype(len)>(NChar));
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// Note: Not strcpy() or strncpy() here. The former has no bounds
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// checking, the latter writes a null-terminator at position 'ncpy'
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// (s_[ncpy]) which violates the post condition if ncpy < NChar.
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std::memcpy(this->s_.data(), s,
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ncpy * sizeof *this->s_.data());
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}
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};
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}}} // Opm::RestartIO::Helpers
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#endif // CHARARRAY_HEADER
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