dev(sell): add simple libc and implement shell

please see the log for detail.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/ulib/iostream.cpp b/src/ulib/iostream.cpp
new file mode 100644
index 0000000..d5394f9
--- /dev/null
+++ b/src/ulib/iostream.cpp
@@ -0,0 +1,8 @@
+#include "ulib/iostream"
+
+namespace std
+{
+    istream cin(stdin);
+    ostream cout(stdout);
+    ostream cerr(stderr);
+} // namespace std