Implement tabby_printer_link_init()

include/tabby/printer.h

@@ -31,6 +31,8 @@ typedef struct _tabby_printer_packet {
     };
 } tabby_printer_packet;
 
+int tabby_printer_link_init(int fd);
+
 /*
  * For receiving printer data packets from a Game Boy Camera
  */

src/printer.c

@@ -9,6 +9,23 @@
 
 #define PACKET_RECV_ERROR_THRESHOLD 30
 
+int tabby_printer_link_init(int fd) {
+    uint8_t out = 'K',
+            in;
+
+    while (1) {
+        read(fd, &in, 1);
+
+        if (in == 'O') {
+            write(fd, &out, 1);
+
+            break;
+        }
+    }
+
+    return 0;
+}
+
 static uint16_t checksum(tabby_printer_packet *header, void *body) {
     uint16_t checksum = header->data[2]
                       + header->data[3]