137 lines
3.5 KiB
C++
137 lines
3.5 KiB
C++
/*
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Copyright (c) 2015-2016, Arvid Norberg
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All rights reserved.
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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
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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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
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors 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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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 THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_STACK_ALLOCATOR
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#include "libtorrent/assert.hpp"
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#include "libtorrent/buffer.hpp"
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namespace libtorrent { namespace aux
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{
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struct stack_allocator
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{
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stack_allocator() {}
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// non-copyable
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stack_allocator(stack_allocator const&) = delete;
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stack_allocator& operator=(stack_allocator const&) = delete;
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int copy_string(std::string const& str)
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{
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int ret = int(m_storage.size());
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m_storage.resize(ret + str.length() + 1);
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strcpy(&m_storage[ret], str.c_str());
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return ret;
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}
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int copy_string(char const* str)
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{
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int ret = int(m_storage.size());
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int len = int(strlen(str));
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m_storage.resize(ret + len + 1);
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strcpy(&m_storage[ret], str);
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return ret;
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}
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int format_string(char const* fmt, va_list v)
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{
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int const ret = int(m_storage.size());
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m_storage.resize(ret + 512);
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#ifdef __clang__
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wformat-nonliteral"
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#endif
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int const len = std::vsnprintf(m_storage.data() + ret, 512, fmt, v);
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#ifdef __clang__
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#pragma clang diagnostic pop
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#endif
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if (len < 0) return copy_string("(format error)");
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// +1 is to include the 0-terminator
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m_storage.resize(ret + (len > 512 ? 512 : len) + 1);
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return ret;
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}
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// TODO: 3 use span<> here
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int copy_buffer(char const* buf, int const size)
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{
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int const ret = int(m_storage.size());
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m_storage.resize(ret + size);
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memcpy(&m_storage[ret], buf, size);
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return ret;
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}
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int allocate(int const bytes)
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{
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TORRENT_ASSERT(bytes >= 0);
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int ret = int(m_storage.size());
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m_storage.resize(ret + bytes);
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return ret;
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}
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char* ptr(int const idx)
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{
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TORRENT_ASSERT(idx >= 0);
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TORRENT_ASSERT(idx < int(m_storage.size()));
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return &m_storage[idx];
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}
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char const* ptr(int const idx) const
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{
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TORRENT_ASSERT(idx >= 0);
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TORRENT_ASSERT(idx < int(m_storage.size()));
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return &m_storage[idx];
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}
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void swap(stack_allocator& rhs)
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{
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m_storage.swap(rhs.m_storage);
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}
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void reset()
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{
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m_storage.clear();
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}
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private:
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std::vector<char> m_storage;
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};
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} }
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#endif
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