--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/case_diffs.c	Fri Oct 19 14:06:22 2007 +0200
@@ -0,0 +1,19 @@
+#include "case.h"
+
+int case_diffs(s,t)
+register char *s;
+register char *t;
+{
+  register unsigned char x;
+  register unsigned char y;
+
+  for (;;) {
+    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) break;
+    if (!x) break;
+  }
+  return ((int)(unsigned int) x) - ((int)(unsigned int) y);
+}