Add a new seat method to return the cursor position.

The motivation is for the SUPDUP protocol.  The server may send a
signal for the terminal to reset any input buffers.  After this, the
server will not know the state of the terminal, so it is required to
send its cursor position back.

misc.c

@@ -368,6 +368,7 @@ bool nullseat_verbose_no(Seat *seat) { return false; }
 bool nullseat_verbose_yes(Seat *seat) { return true; }
 bool nullseat_interactive_no(Seat *seat) { return false; }
 bool nullseat_interactive_yes(Seat *seat) { return true; }
+bool nullseat_get_cursor_position(Seat *seat, int *x, int *y) { return false; }
 
 bool null_lp_verbose_no(LogPolicy *lp) { return false; }
 bool null_lp_verbose_yes(LogPolicy *lp) { return true; }

pscp.c

@@ -83,6 +83,7 @@ static const SeatVtable pscp_seat_vt = {
     nullseat_set_trust_status_vacuously,
     cmdline_seat_verbose,
     nullseat_interactive_no,
+    nullseat_get_cursor_position,
 };
 static Seat pscp_seat[1] = {{ &pscp_seat_vt }};
 

psftp.c

@@ -65,6 +65,7 @@ static const SeatVtable psftp_seat_vt = {
     nullseat_set_trust_status_vacuously,
     cmdline_seat_verbose,
     nullseat_interactive_yes,
+    nullseat_get_cursor_position,
 };
 static Seat psftp_seat[1] = {{ &psftp_seat_vt }};
 

putty.h

@@ -918,6 +918,13 @@ struct SeatVtable {
      * Ask the seat whether it's an interactive program.
      */
     bool (*interactive)(Seat *seat);
+
+    /*
+     * Return the seat's current idea of where the output cursor is.
+     *
+     * Returns true if the seat has a cursor. Returns false if not.
+     */
+    bool (*get_cursor_position)(Seat *seat, int *x, int *y);
 };
 
 static inline size_t seat_output(
@@ -967,6 +974,8 @@ static inline bool seat_verbose(Seat *seat)
 { return seat->vt->verbose(seat); }
 static inline bool seat_interactive(Seat *seat)
 { return seat->vt->interactive(seat); }
+static inline bool seat_get_cursor_position(Seat *seat, int *x, int *y)
+{ return  seat->vt->get_cursor_position(seat, x, y); }
 
 /* Unlike the seat's actual method, the public entry point
  * seat_connection_fatal is a wrapper function with a printf-like API,
@@ -1023,6 +1032,7 @@ bool nullseat_verbose_no(Seat *seat);
 bool nullseat_verbose_yes(Seat *seat);
 bool nullseat_interactive_no(Seat *seat);
 bool nullseat_interactive_yes(Seat *seat);
+bool nullseat_get_cursor_position(Seat *seat, int *x, int *y);
 
 /*
  * Seat functions provided by the platform's console-application
@@ -1607,6 +1617,7 @@ int term_get_userpass_input(Terminal *term, prompts_t *p, bufchain *input);
 void term_set_trust_status(Terminal *term, bool trusted);
 void term_keyinput(Terminal *, int codepage, const void *buf, int len);
 void term_keyinputw(Terminal *, const wchar_t * widebuf, int len);
+void term_get_cursor_position(Terminal *term, int *x, int *y);
 
 typedef enum SmallKeypadKey {
     SKK_HOME, SKK_END, SKK_INSERT, SKK_DELETE, SKK_PGUP, SKK_PGDN,

sesschan.c

@@ -199,6 +199,7 @@ static const SeatVtable sesschan_seat_vt = {
     nullseat_set_trust_status,
     nullseat_verbose_no,
     nullseat_interactive_no,
+    nullseat_get_cursor_position,
 };
 
 Channel *sesschan_new(SshChannel *c, LogContext *logctx,

sshserver.c

@@ -122,6 +122,7 @@ static const SeatVtable server_seat_vt = {
     nullseat_set_trust_status,
     nullseat_verbose_no,
     nullseat_interactive_no,
+    nullseat_get_cursor_position,
 };
 
 static void server_socket_log(Plug *plug, PlugLogType type, SockAddr *addr,

terminal.c

@@ -1810,6 +1810,12 @@ void term_set_trust_status(Terminal *term, bool trusted)
     term->trusted = trusted;
 }
 
+void term_get_cursor_position(Terminal *term, int *x, int *y)
+{
+    *x = term->curs.x;
+    *y = term->curs.y;
+}
+
 /*
  * Set up the terminal for a given size.
  */

unix/gtkwin.c

@@ -373,6 +373,7 @@ static const char *gtk_seat_get_x_display(Seat *seat);
 static bool gtk_seat_get_windowid(Seat *seat, long *id);
 #endif
 static bool gtk_seat_set_trust_status(Seat *seat, bool trusted);
+static bool gtk_seat_get_cursor_position(Seat *seat, int *x, int *y);
 
 static const SeatVtable gtk_seat_vt = {
     gtk_seat_output,
@@ -399,6 +400,7 @@ static const SeatVtable gtk_seat_vt = {
     gtk_seat_set_trust_status,
     nullseat_verbose_yes,
     nullseat_interactive_yes,
+    gtk_seat_get_cursor_position,
 };
 
 static void gtk_eventlog(LogPolicy *lp, const char *string)
@@ -5530,3 +5532,13 @@ static bool gtk_seat_set_trust_status(Seat *seat, bool trusted)
     term_set_trust_status(inst->term, trusted);
     return true;
 }
+
+static bool gtk_seat_get_cursor_position(Seat *seat, int *x, int *y)
+{
+    GtkFrontend *inst = container_of(seat, GtkFrontend, seat);
+    if (inst->term) {
+        term_get_cursor_position(inst->term, x, y);
+        return true;
+    }
+    return false;
+}

unix/uxplink.c

@@ -407,6 +407,7 @@ static const SeatVtable plink_seat_vt = {
     console_set_trust_status,
     cmdline_seat_verbose,
     plink_seat_interactive,
+    nullseat_get_cursor_position,
 };
 static Seat plink_seat[1] = {{ &plink_seat_vt }};
 

windows/window.c

@@ -336,6 +336,7 @@ static void win_seat_connection_fatal(Seat *seat, const char *msg);
 static void win_seat_update_specials_menu(Seat *seat);
 static void win_seat_set_busy_status(Seat *seat, BusyStatus status);
 static bool win_seat_set_trust_status(Seat *seat, bool trusted);
+static bool win_seat_get_cursor_position(Seat *seat, int *x, int *y);
 
 static const SeatVtable win_seat_vt = {
     win_seat_output,
@@ -358,6 +359,7 @@ static const SeatVtable win_seat_vt = {
     win_seat_set_trust_status,
     nullseat_verbose_yes,
     nullseat_interactive_yes,
+    win_seat_get_cursor_position,
 };
 static WinGuiSeat wgs = { .seat.vt = &win_seat_vt,
                           .logpolicy.vt = &win_gui_logpolicy_vt };
@@ -5801,3 +5803,9 @@ static bool win_seat_set_trust_status(Seat *seat, bool trusted)
     term_set_trust_status(term, trusted);
     return true;
 }
+
+static bool win_seat_get_cursor_position(Seat *seat, int *x, int *y)
+{
+    term_get_cursor_position(term, x, y);
+    return true;
+}

windows/winplink.c

@@ -101,6 +101,7 @@ static const SeatVtable plink_seat_vt = {
     console_set_trust_status,
     cmdline_seat_verbose,
     plink_seat_interactive,
+    nullseat_get_cursor_position,
 };
 static Seat plink_seat[1] = {{ &plink_seat_vt }};