From 07d5b4852cf5564781a321ed9b3daeb2ababed28 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Sun, 19 Apr 2026 20:52:29 +0100
Subject: [PATCH] libc: io: fputc now updates errno on success

---
 lib/libc/io/stdio/fputc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/libc/io/stdio/fputc.c b/lib/libc/io/stdio/fputc.c
index df41978..3a323a7 100644
--- a/lib/libc/io/stdio/fputc.c
+++ b/lib/libc/io/stdio/fputc.c
@@ -15,6 +15,7 @@ int __fputc(int c, struct __opaque_file *stream)
 		return EOF;
 	}
 
+	__set_errno(SUCCESS);
 	return c;
 }