--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/case_diffb.c	Fri Oct 19 14:06:22 2007 +0200
@@ -0,0 +1,21 @@
+#include "case.h"
+
+int case_diffb(s,len,t)
+register char *s;
+unsigned int len;
+register char *t;
+{
+  register unsigned char x;
+  register unsigned char y;
+
+  while (len > 0) {
+    --len;
+    x = *s++ - 'A';
+    if (x <= 'Z' - 'A') x += 'a'; else x += 'A';
+    y = *t++ - 'A';
+    if (y <= 'Z' - 'A') y += 'a'; else y += 'A';
+    if (x != y)
+      return ((int)(unsigned int) x) - ((int)(unsigned int) y);
+  }
+  return 0;
+}