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diff byte_diff.c @ 0:2cb46628feec

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from cdb-0.75 per http://cr.yp.to/cdb.html, retrieved 2025-01-03, contents appear to have been create on 2000-02-19
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Wed, 29 Jan 2025 10:50:34 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/byte_diff.c	Wed Jan 29 10:50:34 2025 +0000
@@ -0,0 +1,16 @@
+#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);
+}