[gnome-flashback] backends: add gf_verify_monitor_spec

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 41cfccef578a3d60bdaacd984d69ea1e9ce7b116
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Sep 20 17:54:48 2017 +0300

    backends: add gf_verify_monitor_spec

 backends/gf-monitor-spec-private.h |   15 +++++++++------
 backends/gf-monitor-spec.c         |   21 +++++++++++++++++++++
 2 files changed, 30 insertions(+), 6 deletions(-)
---
diff --git a/backends/gf-monitor-spec-private.h b/backends/gf-monitor-spec-private.h
index 5c02a43..7dd1dd4 100644
--- a/backends/gf-monitor-spec-private.h
+++ b/backends/gf-monitor-spec-private.h
@@ -34,15 +34,18 @@ struct _GfMonitorSpec
   gchar *serial;
 };
 
-GfMonitorSpec *gf_monitor_spec_clone   (GfMonitorSpec *spec);
+GfMonitorSpec *gf_monitor_spec_clone   (GfMonitorSpec  *spec);
 
-gboolean       gf_monitor_spec_equals  (GfMonitorSpec *spec,
-                                        GfMonitorSpec *other_spec);
+gboolean       gf_monitor_spec_equals  (GfMonitorSpec  *spec,
+                                        GfMonitorSpec  *other_spec);
 
-gint           gf_monitor_spec_compare (GfMonitorSpec *spec_a,
-                                        GfMonitorSpec *spec_b);
+gint           gf_monitor_spec_compare (GfMonitorSpec  *spec_a,
+                                        GfMonitorSpec  *spec_b);
 
-void           gf_monitor_spec_free    (GfMonitorSpec *spec);
+void           gf_monitor_spec_free    (GfMonitorSpec  *spec);
+
+gboolean       gf_verify_monitor_spec  (GfMonitorSpec  *spec,
+                                        GError        **error);
 
 G_END_DECLS
 
diff --git a/backends/gf-monitor-spec.c b/backends/gf-monitor-spec.c
index 33be477..41e3f51 100644
--- a/backends/gf-monitor-spec.c
+++ b/backends/gf-monitor-spec.c
@@ -21,6 +21,7 @@
 
 #include "config.h"
 
+#include <gio/gio.h>
 #include <string.h>
 
 #include "gf-monitor-spec-private.h"
@@ -80,3 +81,23 @@ gf_monitor_spec_free (GfMonitorSpec *spec)
   g_free (spec->serial);
   g_free (spec);
 }
+
+gboolean
+gf_verify_monitor_spec (GfMonitorSpec  *spec,
+                        GError        **error)
+{
+  if (spec->connector &&
+      spec->vendor &&
+      spec->product &&
+      spec->serial)
+    {
+      return TRUE;
+    }
+  else
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                   "Monitor spec incomplete");
+
+      return FALSE;
+    }
+}