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+#ifndef utils_h
+#define utils_h
+/* Camicro - Microscope camera viewer.
+ *
+ * Copyright (C) 2019 Nicolas Schodet
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Contact :
+ * Web: http://ni.fr.eu.org/
+ * Email: <nico at ni.fr.eu.org>
+ */
+#include <gtk/gtk.h>
+
+/* Report a fatal error. */
+void
+utils_fatal(const char *fmt, ...)
+ __attribute__((format(printf, 1, 2), noreturn));
+
+/* Report an info. */
+void
+utils_info(const char *fmt, ...)
+ __attribute__((format(printf, 1, 2)));
+
+/* Sleep for a given number of microseconds. */
+void
+utils_delay_us(int us);
+
+/* Display an error message. */
+void
+utils_dialog_error(GtkWindow *parent, const char *fmt, ...)
+ __attribute__((format(printf, 2, 3)));
+
+#endif /* utils_h */