diff --git a/ap/libc/glibc/glibc-2.23/stdio-common/bug20.c b/ap/libc/glibc/glibc-2.23/stdio-common/bug20.c
new file mode 100644
index 0000000..385f6ff
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdio-common/bug20.c
@@ -0,0 +1,32 @@
+/* BZ #5225 */
+#include <stdio.h>
+#include <string.h>
+#include <wchar.h>
+
+static int
+do_test (void)
+{
+  wchar_t in[] = L"123,abc,321";
+  /* This is the critical part for this test.  format must be in
+     read-only memory.  */
+  static const wchar_t format[50] = L"%d,%[^,],%d";
+  int out_d1, out_d2;
+  char out_s[50];
+  printf ("in='%ls' format='%ls'\n", in, format);
+  if (swscanf (in, format, &out_d1, out_s, &out_d2) != 3)
+    {
+      puts ("swscanf did not return 3");
+      return 1;
+    }
+  printf ("in='%ls' format='%ls'\n", in, format);
+  printf ("out_d1=%d out_s='%s' out_d2=%d\n", out_d1, out_s, out_d2);
+  if (out_d1 != 123 || strcmp (out_s, "abc") != 0 || out_d2 != 321)
+    {
+      puts ("swscanf did not return the correct values");
+      return 1;
+    }
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"