1 files changed, 18 insertions, 0 deletions

diff --git a/byte_diff.c b/byte_diff.c
new file mode 100644
index 0000000..0c4d17b
--- /dev/null
+++ b/byte_diff.c
@@ -0,0 +1,18 @@
+/* Public domain. */
+
+#include "byte.h"
+
+int byte_diff(s,n,t)
+register char *s;
+register unsigned int n;
+register char *t;
+{
+  for (;;) {
+    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
+    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
+    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
+    if (!n) return 0; if (*s != *t) break; ++s; ++t; --n;
+  }
+  return ((int)(unsigned int)(unsigned char) *s)
+       - ((int)(unsigned int)(unsigned char) *t);
+}