1 files changed, 10 insertions, 0 deletions
diff --git a/src/stdio/__overflow.c b/src/stdio/__overflow.c
new file mode 100644
index 0000000..e65a594
--- /dev/null
+++ b/src/stdio/__overflow.c
@@ -0,0 +1,10 @@
+#include "stdio_impl.h"
+
+int __overflow(FILE *f, int _c)
+{
+	unsigned char c = _c;
+	if (!f->wend && __towrite(f)) return EOF;
+	if (f->wpos != f->wend && c != f->lbf) return *f->wpos++ = c;
+	if (f->write(f, &c, 1)!=1) return EOF;
+	return c;
+}