mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 01:02:46 +01:00
70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
// The Construct
|
|
//
|
|
// Copyright (C) The Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2020 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_BUFFER_MOVE_H
|
|
|
|
// copy overlapping regions
|
|
namespace ircd::buffer
|
|
{
|
|
char *&move(char *&dest, char *const &stop, const const_buffer &src);
|
|
size_t move(const mutable_buffer &dst, const const_buffer &src);
|
|
template<size_t SIZE> size_t move(const mutable_buffer &dst, const char (&)[SIZE]);
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
#ifndef __clang__
|
|
__attribute__((error
|
|
#else
|
|
__attribute__((unavailable
|
|
#endif
|
|
(
|
|
"Move source is an array. Is this a string literal? Do you want to move the \\0?"
|
|
" Disambiguate this by typing the source string_view or const_buffer."
|
|
)))
|
|
inline size_t
|
|
ircd::buffer::move(const mutable_buffer &dst,
|
|
const char (&buf)[SIZE])
|
|
{
|
|
return move(dst, const_buffer{buf});
|
|
}
|
|
|
|
inline size_t
|
|
ircd::buffer::move(const mutable_buffer &dst,
|
|
const const_buffer &src)
|
|
{
|
|
char *const &s(begin(dst)), *e(s);
|
|
e = move(e, end(dst), src);
|
|
assert(std::distance(s, e) >= 0);
|
|
return std::distance(s, e);
|
|
}
|
|
|
|
inline char *&
|
|
__attribute__((always_inline))
|
|
ircd::buffer::move(char *&dest,
|
|
char *const &stop,
|
|
const const_buffer &src)
|
|
{
|
|
assert(dest <= stop);
|
|
const size_t remain(std::distance(dest, stop));
|
|
const size_t cpsz(std::min(size(src), remain));
|
|
assert(cpsz <= size(src));
|
|
assert(cpsz <= remain);
|
|
|
|
#if __has_builtin(__builtin_memmove_inline) && !defined(RB_GENERIC)
|
|
__builtin_memmove_inline(dest, data(src), cpsz);
|
|
#else
|
|
__builtin_memmove(dest, data(src), cpsz);
|
|
#endif
|
|
|
|
dest += cpsz;
|
|
assert(dest <= stop);
|
|
return dest;
|
|
}
|