From dd04850c27e8bc273506f4a64bb28b7ddf111dc5 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 24 Jul 2025 20:51:55 +0000
Subject: kapi: rework text device interface

---
 kapi/src/cio.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 kapi/src/cio.cpp

(limited to 'kapi/src/cio.cpp')

diff --git a/kapi/src/cio.cpp b/kapi/src/cio.cpp
new file mode 100644
index 0000000..aa26d49
--- /dev/null
+++ b/kapi/src/cio.cpp
@@ -0,0 +1,29 @@
+#include "kapi/cio.hpp"
+
+#include <optional>
+#include <utility>
+
+namespace teachos::cio
+{
+  auto constinit null_device = output_device{};
+
+  auto constinit active_device = &null_device;
+
+  auto set_output_device(output_device & device) -> std::optional<output_device *>
+  {
+    if (&device == active_device)
+    {
+      return {};
+    }
+    return std::exchange(active_device, &device);
+  }
+
+  auto print(std::string_view text) -> void { active_device->write(text); }
+
+  auto println(std::string_view text) -> void { active_device->writeln(text); }
+
+  auto print_error(std::string_view text) -> void { active_device->write_error(text); }
+
+  auto println_error(std::string_view text) -> void { active_device->writeln_error(text); }
+
+}  // namespace teachos::cio
\ No newline at end of file
-- 
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