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server/telnet: Handle Ctrl+A and Ctrl+E 

Handle the Ctrl+A and Ctrl+E shortcuts which move the cursor to the
beginning and end of the command line, respectively.

Change-Id: I89fa5fd3c5edeb08a3f9320fda766f72ce9d7f64
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/3415
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
This commit is contained in:
Marc Schink 2015-10-04 20:21:00 +02:00 committed by Paul Fertser
parent 9cd74c113c
commit e0010c3e6f
1 changed files with 28 additions and 0 deletions
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28
src/server/telnet_server.c
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@ -303,6 +303,30 @@ static void telnet_history_down(struct connection *connection)
telnet_history_go(connection, next_history);
}
static void telnet_move_cursor(struct connection *connection, size_t pos)
{
struct telnet_connection *tc;
size_t tmp;
tc = connection->priv;
if (pos < tc->line_cursor) {
tmp = tc->line_cursor - pos;
for (size_t i = 0; i < tmp; i += 16)
telnet_write(connection, "\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b",
MIN(tmp - i, 16));
} else {
tmp = pos - tc->line_cursor;
for (size_t i = 0; i < tmp; i += 16)
telnet_write(connection, tc->line + tc->line_cursor + i,
MIN(tmp - i, 16));
}
tc->line_cursor = pos;
}
static int telnet_input(struct connection *connection)
{
int bytes_read;
@ -482,6 +506,10 @@ static int telnet_input(struct connection *connection)
telnet_history_up(connection);
else if (*buf_p == CTRL('N')) /* cursor down */
telnet_history_down(connection);
else if (*buf_p == CTRL('A'))
telnet_move_cursor(connection, 0);
else if (*buf_p == CTRL('E'))
telnet_move_cursor(connection, t_con->line_size);
else
LOG_DEBUG("unhandled nonprintable: %2.2x", *buf_p);
}