From f307d999e66a2fd3e8da4e647ad7b94021301431 Mon Sep 17 00:00:00 2001
From: YAMAMOTO Takashi <yamamoto@midokura.com>
Date: Tue, 10 Nov 2020 15:31:01 +0900
Subject: [PATCH] lib_libvsprintf.c: Implement "t" modifier for printf

Introduced by C99 for ptrdiff_t.
---
 libs/libc/stdio/lib_libvsprintf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libs/libc/stdio/lib_libvsprintf.c b/libs/libc/stdio/lib_libvsprintf.c
index 6f38a0dbc68..7f147cf7923 100644
--- a/libs/libc/stdio/lib_libvsprintf.c
+++ b/libs/libc/stdio/lib_libvsprintf.c
@@ -375,7 +375,9 @@ static int vsprintf_internal(FAR struct lib_outstream_s *stream,
                 }
             }
 
-          if (c == 'z')
+          /* Note: On Nuttx, ptrdiff_t == intptr_t == ssize_t. */
+
+          if (c == 'z' || c == 't')
             {
               switch (sizeof(size_t))
                 {