main: Add helper for mocking device node

src/meson.build

@@ -25,6 +25,7 @@ sources = [
   'accel-mount-matrix.c',
   'accel-scale.c',
   'accel-attributes.c',
+  'utils.c',
   resources,
 ]
 

src/utils.c

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2021 Bastien Nocera <hadess@hadess.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3 as published by
+ * the Free Software Foundation.
+ *
+ */
+
+#include "utils.h"
+
+char *
+get_device_file (GUdevDevice *device)
+{
+	if (!IS_TEST)
+		return g_udev_device_get_device_file (device);
+
+	return g_build_filename (g_getenv ("UMOCKDEV_DIR"),
+				 "iio-dev-data.bin",
+				 NULL);
+}

src/utils.h

@@ -10,5 +10,8 @@
 #pragma once
 
 #include <glib.h>
+#include <gudev/gudev.h>
 
 #define IS_TEST (g_getenv ("UMOCKDEV_DIR") != NULL)
+
+char *get_device_file (GUdevDevice *device);