From c38dd32029b7fdc7cb9d1cc4427a43d9d5fb7374 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Sun, 21 Jun 2015 14:31:04 +0100
Subject: similarity.c

---
 similarity.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 similarity.c

diff --git a/similarity.c b/similarity.c
new file mode 100644
index 0000000..b1fbd06
--- /dev/null
+++ b/similarity.c
@@ -0,0 +1,44 @@
+#include <errno.h>
+#include <error.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+	unsigned long matches = 0, misses = 0;
+	char *strings[2];
+	size_t lengths[2];
+	size_t pos[2] = {0};
+	unsigned current = 0;
+
+	if (argc != 3)
+		error(1, 0, "Incorrect number of arguments %d", argc);
+
+	strings[0] = argv[1];
+	lengths[0] = strlen(strings[0]);
+	strings[1] = argv[2];
+	lengths[1] = strlen(strings[1]);
+
+	for (; pos[0] < lengths[0] && pos[1] < lengths[1];) {
+		if (strings[0][pos[0]] == strings[1][pos[1]]) {
+			matches++;
+			pos[0]++;
+			pos[1]++;
+			current = current ? 0 : 1;
+		} else {
+			pos[current ? 0 : 1]++;
+			misses++;
+		}
+	}
+
+	if (lengths[0] > pos[0])
+		misses += lengths[0] - pos[0] - 1;
+
+	if (lengths[1] > pos[1])
+		misses += lengths[1] - pos[1] - 1;
+
+	printf("Matches: %lu, Misses: %lu\n", matches, misses);
+
+	return 0;
+}
-- 
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