mirror of
https://github.com/matrix-construct/construct
synced 2024-12-26 07:23:53 +01:00
112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 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_STRL_H
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// Vintage
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namespace ircd
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{
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struct strlcpy;
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struct strlcat;
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}
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/// This is a function. It works the same as the standard strlcpy() but it has
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/// some useful modernizations and may be informally referred to as strlcpy++.
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///
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/// - It optionally works with string_view inputs and ircd::buffer outputs.
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/// This allows for implicit size parameters and increases its safety while
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/// simplifying its usage (no more sizeof(buf) where buf coderots into char*).
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///
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/// - Its objectification allows for a configurable return type. The old
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/// strlcpy() returned a size integer type. When using string_view's and
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/// buffers this would generally lead to the pattern { dst, strlcpy(dst, src) }
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/// and this is no longer necessary.
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///
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struct ircd::strlcpy
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{
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mutable_buffer ret;
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public:
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operator string_view() const
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{
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return ret;
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}
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operator size_t() const
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{
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return size(ret);
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}
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strlcpy(char *const &dst, const string_view &src, const size_t &max)
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:ret{[&]() -> mutable_buffer
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{
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mutable_buffer buf{dst, max};
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const mutable_buffer tgt
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{
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buf, std::min(size(src), std::max(max, 1UL) - 1UL)
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};
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consume(buf, copy(tgt, src));
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consume(buf, copy(buf, '\0'));
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return tgt;
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}()}
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{}
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#ifndef HAVE_STRLCPY
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strlcpy(char *const &dst, const char *const &src, const size_t &max)
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:strlcpy{dst, string_view{src, strnlen(src, max)}, max}
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{}
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#endif
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strlcpy(const mutable_buffer &dst, const string_view &src)
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:strlcpy{data(dst), src, size(dst)}
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{}
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};
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/// This is a function. It works the same as the standard strlcat() but it has
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/// some useful modernizations and may be informally referred to as strlcat++.
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/// see: ircd::strlcpy().
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///
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struct ircd::strlcat
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{
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mutable_buffer ret;
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public:
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operator string_view() const
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{
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return ret;
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}
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operator size_t() const
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{
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return size(ret);
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}
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strlcat(char *const &dst, const string_view &src, const size_t &max)
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:ret{[&]() -> mutable_buffer
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{
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const auto pos{strnlen(dst, max)};
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const auto remain{max - pos};
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strlcpy(dst + pos, src, remain);
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return { dst, pos + src.size() };
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}()}
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{}
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#ifndef HAVE_STRLCAT
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strlcat(char *const &dst, const char *const &src, const size_t &max)
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:strlcat{dst, string_view{src, ::strnlen(src, max)}, max}
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{}
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#endif
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strlcat(const mutable_buffer &dst, const string_view &src)
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:strlcat{data(dst), src, size(dst)}
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{}
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};
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