mirror of
https://github.com/matrix-construct/construct
synced 2024-08-26 03:15:17 +02:00
38 lines
971 B
C++
38 lines
971 B
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_ENV_H
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namespace ircd::util
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{
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string_view getenv(const string_view &);
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}
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inline ircd::string_view
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ircd::util::getenv(const string_view &key)
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{
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if(unlikely(size(key) > 127))
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throw std::runtime_error
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{
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"getenv(): variable key is too long."
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};
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// Ensure the key is null terminated for the std:: call.
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char keystr[128];
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const size_t len{copy(keystr, key)};
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keystr[std::min(len, sizeof(keystr) - 1)] = '\0';
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const string_view var
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{
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std::getenv(keystr)
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};
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return var;
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}
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