1 files changed, 32 insertions, 0 deletions

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..eb250ae
--- /dev/null
+++ b/util.h
@@ -0,0 +1,32 @@
+#ifndef ITS1_UTIL_H_INCLUDED
+#define ITS1_UTIL_H_INCLUDED
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#ifndef NDEBUG
+static void
+error(const char *msg, ...)
+{
+        va_list ap;
+
+        va_start(ap, msg);
+        fprintf(stderr, "Error: ");
+        vfprintf(stderr, msg, ap);
+        va_end(ap);
+        fprintf(stderr, "\n");
+        exit(EXIT_FAILURE);
+}
+
+#define ERROR(msg) error(msg " in \"%s()\" (%s:%d)", __func__, __FILE__, __LINE__)
+#else
+#define ERROR(msg) /**/
+#endif
+
+#ifndef NELEM
+#define NELEM(x) (sizeof(x) / sizeof(x[0]))
+#endif
+
+#endif
+