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Showing content from https://cplusplus.github.io/LWG/issue3071 below:

[networking.ts] read_until still refers to "input sequence"

template<class SyncReadStream, class DynamicBuffer>
  size_t read_until(SyncReadStream& s, DynamicBuffer&& b, char delim);
template<class SyncReadStream, class DynamicBuffer>
  size_t read_until(SyncReadStream& s, DynamicBuffer&& b,
                    char delim, error_code& ec);
template<class SyncReadStream, class DynamicBuffer>
  size_t read_until(SyncReadStream& s, DynamicBuffer&& b, string_view delim);
template<class SyncReadStream, class DynamicBuffer>
  size_t read_until(SyncReadStream& s, DynamicBuffer&& b,
                    string_view delim, error_code& ec);

-1- Effects: Reads data from the buffer-oriented synchronous read stream (17.1.1 [networking.ts::buffer.stream.reqmts.syncreadstream]) object stream by performing zero or more calls to the stream's read_some member function, until the input sequence readable bytes of the dynamic buffer (16.2.4 [networking.ts::buffer.reqmts.dynamicbuffer]) object b contain s the specified delimiter delim.

-2- Data is placed into the dynamic buffer object b. A mutable buffer sequence (16.2.1) is obtained prior to each read_some call using b.prepare(N), where N is an unspecified value such that N <= max_size() - size(). [Note: Implementations are encouraged to use b.capacity() when determining N, to minimize the number of read_some calls performed on the stream. — end note] After each read_some call, the implementation performs b.commit(n), where n is the return value from read_some. -3- The synchronous read_until operation continues until:

1. (3.1) — the input sequence readable bytes of b contain s the delimiter delim; or

2. (3.2) — b.size() == b.max_size(); or

3. (3.3) — an asynchronous read_some operation fails.

-4- On exit, if the input sequence readable bytes of b contain s the delimiter, ec is set such that !ec is true. Otherwise, if b.size() == b.max_size(), ec is set such that ec == stream_errc::not_found. If b.size() < b.max_size(), ec contains the error_code from the most recent read_some call. -5- Returns: The number of bytes in the input sequence of readable bytes inb up to and including the delimiter, if present. [Note: On completion, the buffer may contain additional bytes following the delimiter. — end note] Otherwise returns 0.

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