2 files changed, 33 insertions, 0 deletions
diff --git a/6.c b/6.c
new file mode 100644
index 0000000..f36c934
--- /dev/null
+++ b/6.c
@@ -0,0 +1,32 @@
+
+#include <stdio.h>
+
+
+int
+main()
+{
+	char buf[4];
+	int c, n = 0;
+
+	while ((c = fgetc(stdin)) != EOF) {
+		buf[n % 4] = c;
+		++n;
+
+		if (n >= 4
+				&& buf[0] != buf[1] && buf[0] != buf[2] && buf[0] != buf[3]
+				&& buf[1] != buf[2] && buf[1] != buf[3] && buf[2] != buf[3])
+		{
+			break;
+		}
+	}
+
+	if (c == EOF) {
+		printf("No marker read in %d bytes\n", n);
+		return 1;
+	}
+
+	printf("Marker read after %d bytes\n", n);
+
+	return 0;
+}
+
diff --git a/makefile b/makefile
index ef0b2f0..b00a363 100644
--- a/makefile
+++ b/makefile
@@ -7,6 +7,7 @@ all: bin \
 	bin/3a bin/3b \
 	bin/4a bin/4b \
 	bin/5 \
+	bin/6 \
 
 bin:
 	mkdir -p $@