1 files changed, 66 insertions, 0 deletions
diff --git a/core/rdar.c b/core/rdar.c
new file mode 100644
index 0000000..ff5022f
--- /dev/null
+++ b/core/rdar.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+
+/* Version conversion macros */
+#define VERSION_U16(MAJOR, MINOR)   \
+    (((MINOR) << 8) | (MAJOR))
+#define VERSION_MAJOR(VERSION)      \
+    ((VERSION) & 0xFF)
+#define VERSION_MINOR(VERSION)      \
+    (((VERSION) >> 8) & 0xFF)
+
+/*
+ * Software version
+ *
+ * XXX: We encode it as a U16 so that we may bundle it
+ *      with the file data as binary.
+ */
+#define RDAR_VERSION VERSION_U16(1, 0)  /* v1.0 */
+
+static void
+help(void)
+{
+    printf("usage: ./rdar <... flags>\n");
+    printf("[-h]    Display this help menu\n");
+    printf("[-v]    Display the program version\n");
+}
+
+static void
+version(void)
+{
+    uint16_t Major, Minor;
+
+    Major = VERSION_MAJOR(RDAR_VERSION);
+    Minor = VERSION_MINOR(RDAR_VERSION);
+    printf("Version v%d.%d\n", Major, Minor);
+}
+
+int
+main(int argc, char **argv)
+{
+    int opt;
+
+    if (argc < 2) {
+        printf("fatal: too few arguments\n");
+        help();
+        return -1;
+    }
+
+    while ((opt = getopt(argc, argv, "hv")) != -1) {
+        switch (opt) {
+        case 'h':
+            help();
+            return -1;
+        case 'v':
+            version();
+            return -1;
+        }
+    }
+}