diff --git a/ap/libc/glibc/glibc-2.23/stdio-common/tst-sprintf.c b/ap/libc/glibc/glibc-2.23/stdio-common/tst-sprintf.c
new file mode 100644
index 0000000..d5284b9
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/stdio-common/tst-sprintf.c
@@ -0,0 +1,90 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <locale.h>
+#include <string.h>
+#include <libc-internal.h>
+
+
+static int
+do_test (void)
+{
+  char buf[100];
+  int result = 0;
+
+  if (sprintf (buf, "%.0ls", L"foo") != 0
+      || strlen (buf) != 0)
+    {
+      puts ("sprintf (buf, \"%.0ls\", L\"foo\") produced some output");
+      result = 1;
+    }
+
+#define SIZE (1024*70000)
+#define STR(x) #x
+
+  char *dst = malloc (SIZE + 1);
+
+  if (dst == NULL)
+    {
+      puts ("memory allocation failure");
+      result = 1;
+    }
+  else
+    {
+      sprintf (dst, "%*s", SIZE, "");
+      if (strnlen (dst, SIZE + 1) != SIZE)
+	{
+	  puts ("sprintf (dst, \"%*s\", " STR(SIZE) ", \"\") did not produce enough output");
+	  result = 1;
+	}
+      free (dst);
+    }
+
+  if (sprintf (buf, "%1$d%3$.*2$s%4$d", 7, 67108863, "x", 8) != 3
+      || strcmp (buf, "7x8") != 0)
+    {
+      printf ("sprintf (buf, \"%%1$d%%3$.*2$s%%4$d\", 7, 67108863, \"x\", 8) produced `%s' output", buf);
+      result = 1;
+    }
+
+  /* We are testing a corner case of the sprintf format string here.  */
+  DIAG_PUSH_NEEDS_COMMENT;
+  DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
+  int n = sprintf (buf, "%67108863.16\"%d", 7);
+  DIAG_POP_NEEDS_COMMENT;
+
+  if (n != 14 || strcmp (buf, "%67108863.16\"7") != 0)
+    {
+      printf ("sprintf (buf, \"%%67108863.16\\\"%%d\", 7) produced `%s' output",
+              buf);
+      result = 1;
+    }
+
+  /* We are testing a corner case of the sprintf format string here.  */
+  DIAG_PUSH_NEEDS_COMMENT;
+  DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
+  n = sprintf (buf, "%*\"%d", 0x3ffffff, 7);
+  DIAG_POP_NEEDS_COMMENT;
+
+  if (n != 11 || strcmp (buf, "%67108863\"7") != 0)
+    {
+      printf ("sprintf (buf, \"%%*\\\"%%d\", 0x3ffffff, 7) produced `%s' output", buf);
+      result = 1;
+    }
+
+  if (setlocale (LC_ALL, "de_DE.UTF-8") == NULL)
+    {
+      puts ("cannot set locale");
+      result = 1;
+    }
+  else if (sprintf (buf, "%.8s\n", "Foo: \277") != 7
+	   || strcmp (buf, "Foo: \277\n") != 0)
+    {
+      printf ("sprintf (buf, \"%%.8s\\n\", \"Foo: \\277\") produced '%s' output\n", buf);
+      result = 1;
+    }
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"