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construct/include/ircd/strn.h

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2019-09-18 18:49:40 +02:00
// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_STRN_H
// Vintage
namespace ircd
{
struct strncpy;
}
/// This is a function. It works the same as the standard strncpy() but it has
/// some useful modernizations and may be informally referred to as strncpy++.
/// See ircd::strlcpy() documentation for reasoning details.
///
struct ircd::strncpy
{
mutable_buffer ret;
public:
operator string_view() const
{
return ret;
}
operator size_t() const
{
return size(ret);
}
strncpy(char *const &dst, const string_view &src, const size_t &max)
:ret{[&]() -> mutable_buffer
{
const auto len(std::min(src.size(), max));
buffer::copy(mutable_buffer(dst, len), src);
return { dst, len };
}()}
{}
#ifndef HAVE_STRNCPY
strncpy(char *const &dst, const char *const &src, const size_t &max)
:strncpy{dst, string_view{src, strnlen(src, max)}, max}
{}
#endif
strncpy(const mutable_buffer &dst, const string_view &src)
:strncpy{data(dst), src, size(dst)}
{}
};