38 lines
1.0 KiB
C++
38 lines
1.0 KiB
C++
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2020, Danny Robson <danny@nerdcruft.net>
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*/
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#include "paths.hpp"
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#include "win32/windows.hpp"
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#include "win32/except.hpp"
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#include <stdexcept>
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///////////////////////////////////////////////////////////////////////////////
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std::filesystem::path
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cruft::paths::expand (std::filesystem::path const &val)
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{
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auto const required_size = ExpandEnvironmentStringsW (val.native ().data (), nullptr, 0) + 1;
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std::wstring store (required_size, '\0');
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auto const actual_size = ExpandEnvironmentStringsW (
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val.native ().data (),
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store.data (),
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store.size ()
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);
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if (actual_size == 0)
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win32::error::throw_code ();
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if (actual_size > required_size)
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throw std::runtime_error ("Unable to expand path");
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store.resize (actual_size);
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return store;
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}
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