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Code Issues Releases Wiki Activity

ircd::buffer: Add move() analogue.

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This commit is contained in:
Jason Volk 2018-03-20 02:18:26 -07:00
parent bd80297733
commit 7a86a134fc
1 changed files with 46 additions and 0 deletions
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46
include/ircd/buffer/buffer.h
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@ -68,8 +68,11 @@ namespace ircd::buffer
template<class it> size_t consume(buffer<it> &buffer, const size_t &bytes);
template<class it> buffer<it> operator+(const buffer<it> &buffer, const size_t &bytes);
template<class it> it copy(it &dest, const it &stop, const const_buffer &);
template<class it> it move(it &dest, const it &stop, const const_buffer &);
template<size_t SIZE> size_t copy(const mutable_buffer &dst, const char (&buf)[SIZE]);
template<size_t SIZE> size_t move(const mutable_buffer &dst, const char (&buf)[SIZE]);
size_t copy(const mutable_buffer &dst, const const_buffer &src);
size_t move(const mutable_buffer &dst, const const_buffer &src);
size_t reverse(const mutable_buffer &dst, const const_buffer &src);
void reverse(const mutable_buffer &buf);
void zero(const mutable_buffer &buf);
@ -210,6 +213,19 @@ ircd::buffer::reverse(const mutable_buffer &dst,
return ret;
}
template<size_t SIZE>
__attribute__((error
(
"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});
}
template<size_t SIZE>
__attribute__((error
(
@ -223,6 +239,16 @@ ircd::buffer::copy(const mutable_buffer &dst,
return copy(dst, const_buffer{buf});
}
inline size_t
ircd::buffer::move(const mutable_buffer &dst,
const const_buffer &src)
{
auto e{begin(dst)};
move(e, end(dst), src);
assert(std::distance(begin(dst), e) >= 0);
return std::distance(begin(dst), e);
}
inline size_t
ircd::buffer::copy(const mutable_buffer &dst,
const const_buffer &src)
@ -233,6 +259,26 @@ ircd::buffer::copy(const mutable_buffer &dst,
return std::distance(begin(dst), e);
}
template<class it>
it
ircd::buffer::move(it &dest,
const it &stop,
const const_buffer &src)
{
const it ret{dest};
const ssize_t srcsz(size(src));
assert(ret <= stop);
const ssize_t remain{std::distance(ret, stop)};
const ssize_t mvsz{std::min(srcsz, remain)};
assert(mvsz <= srcsz);
assert(mvsz <= remain);
assert(remain >= 0);
memmove(ret, data(src), mvsz);
dest += mvsz;
assert(dest <= stop);
return ret;
}
template<class it>
it
ircd::buffer::copy(it &dest,