test-terminal_expect_send: expect-like helper tool

A small terminal-client tool, which expects a specific line(-start),
and then sends a specified line to the other side. Optionally,
it prints all received lines to its LOG service.

Ref #3278

repos/os/src/test/terminal_expect_send/main.cc

@@ -0,0 +1,79 @@
+/*
+ * \brief  Send terminal output on specified input (like expect)
+ * \author Stefan Kalkowski
+ * \date   2019-04-03
+ */
+
+/*
+ * Copyright (C) 2019 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU Affero General Public License version 3.
+ */
+
+/* Genode includes */
+#include <base/attached_rom_dataspace.h>
+#include <base/component.h>
+#include <terminal_session/connection.h>
+
+using namespace Genode;
+
+struct Main
+{
+	enum { MAX_LINE_LENGTH = 512 };
+
+	using Line = String<MAX_LINE_LENGTH>;
+	Terminal::Connection terminal;
+	Signal_handler<Main> read_avail;
+	unsigned             line_idx = 0;
+	char                 line[MAX_LINE_LENGTH];
+	char                 read_buffer[MAX_LINE_LENGTH];
+	Line                 expect {};
+	Line                 send {};
+	bool                 verbose { false };
+
+	void handle_read_avail()
+	{
+		unsigned num_bytes = terminal.read(read_buffer, sizeof(read_buffer));
+
+		for (unsigned i = 0; i < num_bytes; i++) {
+
+			/* copy over all characters other than line-end */
+			if (read_buffer[i] != '\n' &&
+			    read_buffer[i] != '\r') {
+				line[line_idx++] = read_buffer[i];
+				line[line_idx] = 0;
+			}
+
+			/* check for expected line-start string, if found send line */
+			if (expect.valid() && expect == line) {
+				terminal.write(send.string(), send.length()-1);
+				terminal.write("\r\n", 2);
+			}
+
+			/* check for line end */
+			if (read_buffer[i] == '\n') {
+				if (verbose) log(Cstring(line));
+				line_idx = 0;
+			}
+		}
+	}
+
+	Main(Env &env) : terminal(env),
+	                 read_avail(env.ep(), *this, &Main::handle_read_avail)
+	{
+		terminal.read_avail_sigh(read_avail);
+
+		try {
+			Genode::Attached_rom_dataspace config { env, "config" };
+
+			verbose = config.xml().attribute_value("verbose", false);
+			config.xml().attribute("expect").value(line, sizeof(line));
+			expect = Line(line);
+			config.xml().attribute("send").value(line, sizeof(line));
+			send = Line(line);
+		} catch (...) { warning("No config data available"); }
+	}
+};
+
+void Component::construct(Env &env) { static Main main(env); }

repos/os/src/test/terminal_expect_send/target.mk

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+TARGET = test-terminal_expect_send
+SRC_CC = main.cc
+LIBS   = base