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string.cpp
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78 lines (68 loc) · 2.42 KB
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/**
* @file string.cpp
* @package cppp-base
* @author ChenPi11
* @brief C++ Plus String type implementation.
* @version 0.0.1
* @date 2023-08-26
* @copyright Copyright (c) 2023 The C++ Plus Project
*/
/* Copyright (C) 2023 The C++ Plus Project.
This file is part of the cppp-base library.
The cppp-base library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the The C++ Plus Project; either version 3
of the License, or (at your option) any later version.
The cppp-base library is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the cppp-base library; see the file COPYING.
If not, see <https://www.gnu.org/licenses/>. */
#include "cppp/exception.hpp"
#include "cppp/messages.hpp"
#include <cppp/string.hpp>
#include <cstdlib>
#include <iostream>
#include <cstring>
using namespace cppp;
/*
1. The minimum increment or decrement unit length for each allocation operation is 'DEFAULT_ALLOCATE_SIZE'.
2. Each allocation operation ensures that the allocated '_allocated_size' is divisible by 'DEFAULT_ALLOCATE_SIZE'.
3. Each allocation operation ensures that the allocated '_allocated_size' is greater than or equal to 'length'.
4. The length of allocation is determined based on 'length'.
*/
void WString::_update_buffer_size(const SizeType& length)
{
CharType* new_buffer = nullptr;
SizeType new_size = (length / DEFAULT_ALLOCATE_SIZE + (SizeType)(bool)(length % DEFAULT_ALLOCATE_SIZE)) * DEFAULT_ALLOCATE_SIZE;
if(new_size == 0)
{
free(_raw_data);
goto end;
}
new_buffer = (CharType*)realloc(_raw_data, new_size * sizeof(CharType));
if (new_buffer == nullptr)
{
throw MemoryError(base::messages::ERROR_ALLOC_MEMORY);
}
end:
_raw_data = new_buffer;
_allocated_size = new_size;
_length = length;
memset(_raw_data + _length, 0, _allocated_size - _length);
}
// Reset the string.
WString::WString()
{
_update_buffer_size(0);
}
WString::WString(const WString& string)
{
_update_buffer_size(string.length());
}
WString::WString(const WString&& string)
{
_update_buffer_size(string.length());
}