diff --git a/xtandard.c b/xtandard.c
index 35097be..ba8b6fe 100644
--- a/xtandard.c
+++ b/xtandard.c
@@ -67,6 +67,16 @@ void fatal_failure (int condition, char * message) {
 	}
 }
 
+void limit (int * value, int minimum, int maximum) {
+	if (* value <= minimum) {
+		* value = minimum;
+	}
+
+	if (* value >= maximum) {
+		* value = maximum;
+	}
+}
+
 void * allocate (int size) {
 	char * data = NULL;
 
diff --git a/xtandard.h b/xtandard.h
index 4eed4d0..c54b94d 100644
--- a/xtandard.h
+++ b/xtandard.h
@@ -80,6 +80,8 @@ extern void echo_byte     (int);
 
 extern void fatal_failure (int, char *);
 
+extern void limit (int *, int, int);
+
 extern void * allocate   (int);
 extern void * reallocate (void *, int);
 extern void * deallocate (void *);