Printf in userspace

ulib/putchar.c

@@ -0,0 +1,9 @@
+#include <stdint.h>
+#include <sysdefs/ipcpipe.h>
+#include <system/ipcpipe.h>
+#include <printf/printf.h>
+
+void putchar_(char c) {
+  char buf = c;
+  ipcpipe(IPCPIPE_SELFPID, IPCPIPE_OUT, IPCPIPE_WRITE, (uint8_t *)&buf, sizeof(buf));
+}