57 lines
1.6 KiB
V
57 lines
1.6 KiB
V
module net
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const (
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crlf = '\r\n'
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msg_peek = 0x02
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max_read = 400
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)
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// read_line is a *simple*, *non customizable*, blocking line reader.
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// It will *always* return a line, ending with CRLF, or just '', on EOF.
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// NB: if you want more control over the buffer, please use a buffered IO
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// reader instead: `io.new_buffered_reader({reader: io.make_reader(con)})`
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pub fn (mut con TcpConn) read_line() string {
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mut buf := [max_read]byte{} // where C.recv will store the network data
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mut res := '' // The final result, including the ending \n.
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for {
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mut line := '' // The current line. Can be a partial without \n in it.
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n := C.recv(con.sock.handle, buf, max_read - 1, msg_peek | msg_nosignal)
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if n == -1 {
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return res
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}
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if n == 0 {
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return res
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}
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buf[n] = `\0`
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mut eol_idx := -1
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for i in 0 .. n {
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if int(buf[i]) == `\n` {
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eol_idx = i
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// Ensure that tos_clone(buf) later,
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// will return *only* the first line (including \n),
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// and ignore the rest
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buf[i + 1] = `\0`
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break
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}
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}
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bufbp := byteptr(buf)
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line = tos_clone(bufbp)
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if eol_idx > 0 {
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// At this point, we are sure that recv returned valid data,
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// that contains *at least* one line.
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// Ensure that the block till the first \n (including it)
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// is removed from the socket's receive queue, so that it does
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// not get read again.
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C.recv(con.sock.handle, buf, eol_idx + 1, msg_nosignal)
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res += line
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break
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}
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// recv returned a buffer without \n in it .
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C.recv(con.sock.handle, buf, n, msg_nosignal)
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res += line
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res += crlf
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break
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}
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return res
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}
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