diff --git a/src/reader.c b/src/reader.c
new file mode 100644
index 0000000..eb756cc
--- /dev/null
+++ b/src/reader.c
@@ -0,0 +1,43 @@
+/* reader.c: Stream reader implementation
+ * Created: 2026-02-04
+ * Author: Aryadev Chavali
+ * License: See end of file
+ * Commentary:
+ */
+
+#include <ctype.h>
+#include <string.h>
+
+#include <alisp/base.h>
+#include <alisp/reader.h>
+
+const char *read_err_to_cstr(read_err_t err)
+{
+  switch (err)
+  {
+  case READ_ERR_OK:
+    return "OK";
+    break;
+  case READ_ERR_EOF:
+    return "EOF";
+    break;
+  case READ_ERR_UNKNOWN_CHAR:
+    return "UNKNOWN_CHAR";
+    break;
+  default:
+    FAIL("Unreachable");
+  }
+}
+
+/* Copyright (C) 2026 Aryadev Chavali
+
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License Version 2 for
+ * details.
+
+ * You may distribute and modify this code under the terms of the GNU General
+ * Public License Version 2, which you should have received a copy of along with
+ * this program.  If not, please go to <https://www.gnu.org/licenses/>.
+
+ */