diff --git a/src/common/chartype.c b/src/common/chartype.c
index 31412948e..193dc3200 100644
--- a/src/common/chartype.c
+++ b/src/common/chartype.c
@@ -79,9 +79,9 @@ int IsAscii (char C)
 
 
 int IsBlank (char C)
-/* Check for a space, tab or newline */
+/* Check for a space or tab */
 {
-    return (C == ' ' || C == '\t' || C == '\n');
+    return (C == ' ' || C == '\t');
 }
 
 
@@ -110,6 +110,14 @@ int IsUpper (char C)
 
 
 
+int IsBDigit (char C)
+/* Check for binary digits (0/1) */
+{
+    return (C == '0' || C == '1');
+}
+
+
+
 int IsXDigit (char C)
 /* Check for hexadecimal digits */
 {
diff --git a/src/common/chartype.h b/src/common/chartype.h
index 3f895e4d0..3292da75e 100644
--- a/src/common/chartype.h
+++ b/src/common/chartype.h
@@ -65,7 +65,7 @@ int IsAscii (char C);
 /* Check for an ASCII character */
 
 int IsBlank (char C);
-/* Check for a space, tab or newline */
+/* Check for a space or tab */
 
 int IsDigit (char C);
 /* Check for a digit */
@@ -73,12 +73,12 @@ int IsDigit (char C);
 int IsLower (char C);
 /* Check for a lower case char */
 
-int IsSpace (char C);
-/* Check for white space characters */
-
 int IsUpper (char C);
 /* Check for upper case characters */
 
+int IsBDigit (char C);
+/* Check for binary digits (0/1) */
+
 int IsXDigit (char C);
 /* Check for hexadecimal digits */