mirror of
https://github.com/matrix-construct/construct
synced 2024-11-06 05:48:54 +01:00
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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_BUFFER_MOVE_H
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// copy overlapping regions
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namespace ircd::buffer
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{
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char *&move(char *&dest, char *const &stop, const const_buffer &src);
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size_t move(const mutable_buffer &dst, const const_buffer &src);
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template<size_t SIZE> size_t move(const mutable_buffer &dst, const char (&)[SIZE]);
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}
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template<size_t SIZE>
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#ifndef __clang__
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__attribute__((error
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#else
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__attribute__((unavailable
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#endif
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(
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"Move source is an array. Is this a string literal? Do you want to move the \\0?"
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" Disambiguate this by typing the source string_view or const_buffer."
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)))
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inline size_t
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ircd::buffer::move(const mutable_buffer &dst,
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const char (&buf)[SIZE])
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{
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return move(dst, const_buffer{buf});
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}
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inline size_t
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ircd::buffer::move(const mutable_buffer &dst,
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const const_buffer &src)
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{
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char *const &s(begin(dst)), *e(s);
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e = move(e, end(dst), src);
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assert(std::distance(s, e) >= 0);
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return std::distance(s, e);
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}
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inline char *&
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__attribute__((always_inline))
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ircd::buffer::move(char *&dest,
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char *const &stop,
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const const_buffer &src)
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{
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assert(dest <= stop);
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const size_t remain(std::distance(dest, stop));
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const size_t cpsz(std::min(size(src), remain));
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assert(cpsz <= size(src));
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assert(cpsz <= remain);
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#if __has_builtin(__builtin_memmove_inline) && !defined(RB_GENERIC)
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__builtin_memmove_inline(dest, data(src), cpsz);
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#else
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__builtin_memmove(dest, data(src), cpsz);
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#endif
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dest += cpsz;
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assert(dest <= stop);
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return dest;
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}
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