mirror of
https://github.com/matrix-construct/construct
synced 2024-07-01 08:18:20 +02:00
117 lines
3 KiB
C++
117 lines
3 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_COPY_H
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namespace ircd::buffer
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{
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// copy single character
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char *©(char *&dest, char *const &stop, char src);
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size_t copy(const mutable_buffer &dst, const char src);
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// copy non-overlapping regions
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char *©(char *&dest, char *const &stop, const const_buffer &src);
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size_t copy(const mutable_buffer &dst, const const_buffer &src);
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template<size_t SIZE> size_t copy(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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"Copy source is an array. Is this a string literal? Do you want to copy 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::copy(const mutable_buffer &dst,
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const char (&buf)[SIZE])
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{
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return copy(dst, const_buffer{buf});
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}
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inline size_t
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ircd::buffer::copy(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 = copy(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 size_t
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ircd::buffer::copy(const mutable_buffer &dst,
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const char src)
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{
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char *const &s(begin(dst)), *e(s);
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e = copy(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::copy(char *&__restrict__ dest,
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char *const &__restrict__ 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 auto *const __restrict__ srcp
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{
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data(src)
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};
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const size_t remain
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(
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std::distance(dest, stop)
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);
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const size_t cpsz
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{
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std::min(size(src), remain)
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};
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assert(!overlap(const_buffer(dest, cpsz), src));
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assert(cpsz <= size(src));
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assert(cpsz <= remain);
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// Suppress warnings which present from the __builtin_memcpy() but these
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// are actually caused by the overlap assertion above which should have no
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// side-effects; this is very likely a bug in gcc.
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#pragma GCC diagnostic push
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#ifdef RB_ASSERT
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#pragma GCC diagnostic ignored "-Warray-bounds"
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#pragma GCC diagnostic ignored "-Wstringop-overflow"
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#endif
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__builtin_memcpy(dest, srcp, cpsz);
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#pragma GCC diagnostic pop
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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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inline char *&
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ircd::buffer::copy(char *&__restrict__ dest,
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char *const &__restrict__ stop,
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char src)
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{
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assert(dest <= stop);
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const bool cpsz(dest != stop);
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(cpsz? *dest : src) = src;
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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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