1 files changed, 53 insertions, 1 deletions
diff --git a/tests/test-stdio.c b/tests/test-stdio.c
index 1908da35..49969520 100644
--- a/tests/test-stdio.c
+++ b/tests/test-stdio.c
@@ -1,5 +1,5 @@
 /* Test of <stdio.h> substitute.
-   Copyright (C) 2007, 2009-2022 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009-2024 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -23,6 +23,9 @@
 /* Check that the various SEEK_* macros are defined.  */
 int sk[] = { SEEK_CUR, SEEK_END, SEEK_SET };
 
+/* Check that the _PRINTF_NAN_LEN_MAX macro is defined.  */
+int pnlm[] = { _PRINTF_NAN_LEN_MAX };
+
 /* Check that NULL can be passed through varargs as a pointer type,
    per POSIX 2008.  */
 static_assert (sizeof NULL == sizeof (void *));
@@ -34,8 +37,57 @@ size_t t3;
 ssize_t t4;
 va_list t5;
 
+#include <string.h>
+
+#include "signed-nan.h"
+#include "signed-snan.h"
+#include "macros.h"
+
 int
 main (void)
 {
+  {
+    double value1;
+    char buf[64];
+
+    value1 = positive_NaNd();
+    sprintf (buf, "%g", value1);
+    ASSERT (strlen (buf) <= _PRINTF_NAN_LEN_MAX);
+
+    value1 = negative_NaNd();
+    sprintf (buf, "%g", value1);
+    ASSERT (strlen (buf) <= _PRINTF_NAN_LEN_MAX);
+  }
+#if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
+  /* Check the value of _PRINTF_NAN_LEN_MAX.  */
+  {
+    double value1;
+    memory_double value2;
+    char buf[64];
+
+    value1 = positive_SNaNd();
+    sprintf (buf, "%g", value1);
+    ASSERT (strlen (buf) <= _PRINTF_NAN_LEN_MAX);
+
+    value1 = negative_SNaNd();
+    sprintf (buf, "%g", value1);
+    ASSERT (strlen (buf) <= _PRINTF_NAN_LEN_MAX);
+
+    value2.value = positive_NaNd ();
+    #if DBL_EXPBIT0_BIT == 20
+    value2.word[DBL_EXPBIT0_WORD] ^= 0x54321;
+    #endif
+    sprintf (buf, "%g", value2.value);
+    ASSERT (strlen (buf) <= _PRINTF_NAN_LEN_MAX);
+
+    value2.value = negative_NaNd ();
+    #if DBL_EXPBIT0_BIT == 20
+    value2.word[DBL_EXPBIT0_WORD] ^= 0x54321;
+    #endif
+    sprintf (buf, "%g", value2.value);
+    ASSERT (strlen (buf) <= _PRINTF_NAN_LEN_MAX);
+  }
+#endif
+
   return 0;
 }