1 files changed, 34 insertions, 0 deletions
diff --git a/Source/Applications/Shell/Applets/cat.cpp b/Source/Applications/Shell/Applets/cat.cpp
new file mode 100644
index 0000000..169226e
--- /dev/null
+++ b/Source/Applications/Shell/Applets/cat.cpp
@@ -0,0 +1,34 @@
+#include <App/StreamApp.proto.h>
+
+class rot13 : public StreamApp {
+	public:
+	rot13() : StreamApp("cat", "Concatenate some input files") {
+		addFlag("r", "rot13", "Apply a ROT13 encryption to the output", FT_BOOL, "");
+	}
+	int run();
+};
+
+APP(rot13);
+
+int rot13::run() {
+	while (!in->eof()) {
+		String s = in->get();
+		if (in->eof() && s.empty()) break;
+		if (bFlag("rot13")) {
+			for (u32int i = 0; i < s.size(); i++) {
+				WChar &c = s[i];
+				if (c >= WChar('A') and c <= WChar('Z')) {
+					c += 13;
+					if (c > WChar('Z')) c -= 26;
+				}
+				if (c >= WChar('a') and c <= WChar('z')) {
+					c += 13;
+					if (c > WChar('z')) c -= 26;
+				}
+			}
+		}
+		*out << s << ENDL;
+	}
+	return 0;
+}
+