From 6f9edfe7a295ed49ebcdd6bb5674bc70c070e1a3 Mon Sep 17 00:00:00 2001
From: Hendrik van Essen <hendrik.vanessen@ml-pa.com>
Date: Tue, 18 Jul 2023 23:00:33 +0200
Subject: [PATCH] sys/stdio_uart: add stdio_clear_stdin

---
 sys/include/stdio_base.h | 9 +++++++++
 sys/stdio/stdio.c        | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/sys/include/stdio_base.h b/sys/include/stdio_base.h
index 0d0a5a2427..2a9bf6d702 100644
--- a/sys/include/stdio_base.h
+++ b/sys/include/stdio_base.h
@@ -102,6 +102,15 @@ void stdio_init(void);
 int stdio_available(void);
 #endif
 
+/**
+ * @brief   Clear the input buffer
+ *
+ * @note    Requires 'USEMODULE += stdin'
+ *
+ * @warning This function does only work if the stdio implementation supports it.
+ */
+void stdio_clear_stdin(void);
+
 /**
  * @brief read @p len bytes from stdio uart into @p buffer
  *
diff --git a/sys/stdio/stdio.c b/sys/stdio/stdio.c
index 11fb6c5cf7..e98e70c8ed 100644
--- a/sys/stdio/stdio.c
+++ b/sys/stdio/stdio.c
@@ -78,3 +78,10 @@ int stdio_available(void)
     return tsrb_avail(&stdin_isrpipe.tsrb);
 }
 #endif
+
+void stdio_clear_stdin(void)
+{
+    if (IS_USED(MODULE_STDIN)) {
+        tsrb_clear(&stdin_isrpipe.tsrb);
+    }
+}