Add util.h

1 files changed, 22 insertions, 0 deletions

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..6ae26a6
--- /dev/null
+++ b/util.h
@@ -0,0 +1,22 @@
+#ifndef _util_h_
+#define _util_h_
+
+#include <ctype.h>
+#include "xenon.h"
+
+#define min(a,b) ((a)<(b)?(a):(b))
+#define max(a,b) ((a)>(b)?(a):(b))
+
+static int inline hexval(char digit)
+{
+	if (!isxdigit(digit))
+		return 0;
+	if (isdigit(digit))
+		return digit - '0';
+	if (isalpha(digit))
+		return tolower(digit) - 'a' + 10;
+	return 0;
+}
+
+#endif
+