From a416f938f3c940d9b05462b85c6f9165a7200cf6 Mon Sep 17 00:00:00 2001
From: Alex Dowad <alexinbeijing@gmail.com>
Date: Thu, 5 Nov 2020 23:27:07 +0200
Subject: [PATCH] Treat non-ASCII characters as erroneous when converting ASCII
 text

---
 ext/mbstring/libmbfl/filters/mbfilter_ascii.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ext/mbstring/libmbfl/filters/mbfilter_ascii.c b/ext/mbstring/libmbfl/filters/mbfilter_ascii.c
index 4e02c26aac8..e411d8a7073 100644
--- a/ext/mbstring/libmbfl/filters/mbfilter_ascii.c
+++ b/ext/mbstring/libmbfl/filters/mbfilter_ascii.c
@@ -79,7 +79,12 @@ const struct mbfl_convert_vtbl vtbl_wchar_ascii = {
  */
 int mbfl_filt_conv_ascii_wchar(int c, mbfl_convert_filter *filter)
 {
-	return (*filter->output_function)(c, filter->data);
+	if (c < 0x80) {
+		(*filter->output_function)(c, filter->data);
+	} else {
+		(*filter->output_function)(c | MBFL_WCSGROUP_THROUGH, filter->data);
+	}
+	return c;
 }