server/telnet: Handle Ctrl+K

Handle Ctrl+K shortcut which clears the line from the cursor position
to the end of line.

Change-Id: I2ecff5284473cef7c11cf9cb7e1c0c97d55f6c1c
Signed-off-by: Brian Brooks <brooks.brian@gmail.com>
Reviewed-on: http://openocd.zylin.com/5868
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
Reviewed-by: Marc Schink <dev@zapb.de>

diff --git a/src/server/telnet_server.c b/src/server/telnet_server.c
index 0243c6328eb8205236eaaea6dbb7d3ee3edc4911..407ab68aefcd74d41d31f205e6e16fb3828cbef2 100644 (file)
--- a/src/server/telnet_server.c
+++ b/src/server/telnet_server.c
@@ -538,7 +538,17 @@ static int telnet_input(struct connection *connection)
                                                        telnet_move_cursor(connection, 0);
                                                else if (*buf_p == CTRL('E'))
                                                        telnet_move_cursor(connection, t_con->line_size);
-                                               else
+                                               else if (*buf_p == CTRL('K')) {         /* kill line to end */
+                                                       if (t_con->line_cursor < t_con->line_size) {
+                                                               /* overwrite with space, until end of line, move back */
+                                                               for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
+                                                                       telnet_write(connection, " ", 1);
+                                                               for (size_t i = t_con->line_cursor; i < t_con->line_size; i++)
+                                                                       telnet_write(connection, "\b", 1);
+                                                               t_con->line[t_con->line_cursor] = '\0';
+                                                               t_con->line_size = t_con->line_cursor;
+                                                       }
+                                               } else
                                                        LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
                                        }
                                }