console: add & use qemu_console_lookup_by_device_name

We have two places needing this, and a third one will come shortly.
So factor things out into a helper function to reduce code duplication.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>

include/ui/console.h

@@ -378,6 +378,8 @@ void graphic_hw_gl_block(QemuConsole *con, bool block);
 
 QemuConsole *qemu_console_lookup_by_index(unsigned int index);
 QemuConsole *qemu_console_lookup_by_device(DeviceState *dev, uint32_t head);
+QemuConsole *qemu_console_lookup_by_device_name(const char *device_id,
+                                                uint32_t head, Error **errp);
 bool qemu_console_is_visible(QemuConsole *con);
 bool qemu_console_is_graphic(QemuConsole *con);
 bool qemu_console_is_fixedsize(QemuConsole *con);

ui/console.c

@@ -1790,6 +1790,29 @@ QemuConsole *qemu_console_lookup_by_device(DeviceState *dev, uint32_t head)
     return NULL;
 }
 
+QemuConsole *qemu_console_lookup_by_device_name(const char *device_id,
+                                                uint32_t head, Error **errp)
+{
+    DeviceState *dev;
+    QemuConsole *con;
+
+    dev = qdev_find_recursive(sysbus_get_default(), device_id);
+    if (dev == NULL) {
+        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+                  "Device '%s' not found", device_id);
+        return NULL;
+    }
+
+    con = qemu_console_lookup_by_device(dev, head);
+    if (con == NULL) {
+        error_setg(errp, "Device %s (head %d) is not bound to a QemuConsole",
+                   device_id, head);
+        return NULL;
+    }
+
+    return con;
+}
+
 bool qemu_console_is_visible(QemuConsole *con)
 {
     return (con == active_console) || (con->dcls > 0);

ui/input.c

@@ -82,19 +82,12 @@ void qemu_input_handler_bind(QemuInputHandlerState *s,
                              const char *device_id, int head,
                              Error **errp)
 {
-    DeviceState *dev;
     QemuConsole *con;
+    Error *err = NULL;
 
-    dev = qdev_find_recursive(sysbus_get_default(), device_id);
+    con = qemu_console_lookup_by_device_name(device_id, head, &err);
-    if (dev == NULL) {
+    if (err) {
-        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+        error_propagate(errp, err);
-                  "Device '%s' not found", device_id);
-        return;
-    }
-
-    con = qemu_console_lookup_by_device(dev, head);
-    if (con == NULL) {
-        error_setg(errp, "Device %s is not bound to a QemuConsole", device_id);
         return;
     }
 

ui/vnc.c

@@ -3732,19 +3732,12 @@ void vnc_display_open(const char *id, Error **errp)
 
     device_id = qemu_opt_get(opts, "display");
     if (device_id) {
-        DeviceState *dev;
         int head = qemu_opt_get_number(opts, "head", 0);
+        Error *err = NULL;
 
-        dev = qdev_find_recursive(sysbus_get_default(), device_id);
+        con = qemu_console_lookup_by_device_name(device_id, head, &err);
-        if (dev == NULL) {
+        if (err) {
-            error_setg(errp, "Device '%s' not found", device_id);
+            error_propagate(errp, err);
-            goto fail;
-        }
-
-        con = qemu_console_lookup_by_device(dev, head);
-        if (con == NULL) {
-            error_setg(errp, "Device %s is not bound to a QemuConsole",
-                       device_id);
             goto fail;
         }
     } else {