1 files changed, 76 insertions, 0 deletions
diff --git a/kern/src/print.cpp b/kern/src/print.cpp
new file mode 100644
index 0000000..64e2c65
--- /dev/null
+++ b/kern/src/print.cpp
@@ -0,0 +1,76 @@
+
+#include "kern/print.hpp"
+
+#include <string_view>
+
+namespace teachos
+{
+  namespace
+  {
+    print_handler * current_print_handler{};
+    println_handler * current_println_handler{};
+    print_handler * current_print_error_handler{};
+    println_handler * current_println_error_handler{};
+  }  // namespace
+
+  auto print(std::string_view text) -> void
+  {
+    if (current_print_handler)
+    {
+      current_print_handler(text);
+    }
+  }
+
+  auto println(std::string_view text) -> void
+  {
+    if (current_println_handler)
+    {
+      current_println_handler(text);
+    }
+  }
+
+  auto print_error(std::string_view text) -> void
+  {
+    if (current_print_error_handler)
+    {
+      current_print_error_handler(text);
+    }
+  }
+
+  auto println_error(std::string_view text) -> void
+  {
+    if (current_println_error_handler)
+    {
+      current_println_error_handler(text);
+    }
+  }
+
+  auto set_print_handler(print_handler handler) -> print_handler *
+  {
+    auto old = current_print_handler;
+    current_print_handler = handler;
+    return old;
+  }
+
+  auto set_println_handler(println_handler handler) -> print_handler *
+  {
+    auto old = current_println_handler;
+    current_println_handler = handler;
+    return old;
+  }
+
+  auto set_print_error_handler(print_handler handler) -> print_handler *
+  {
+    auto old = current_print_error_handler;
+    current_print_error_handler = handler;
+    return old;
+  }
+
+  auto set_println_error_handler(println_handler handler) -> print_handler *
+  {
+    auto old = current_println_error_handler;
+    current_println_error_handler = handler;
+    return old;
+  }
+
+}  // namespace teachos