From f535e5b6db1026d95b6bb5be11f15da3dd5eee90 Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Fri, 30 May 2014 08:53:55 -0600
Subject: [PATCH] snprintf():  If size is zero, then snprintf() should return
 the size of the required buffer without writing anyting.  From Sami Pelkonen

---
 ChangeLog | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 4518aec22f..f6d5c674a5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -7382,3 +7382,6 @@
 	* arch/arm/src/stm32/stm32_rtcc.c:  Add retry logic to RTC initialization.
 	  It sometimes takes longer for the RTC to initialize, at least as noted
 	  on an F2 part.  From dlsitzer (2014-5-27).
+	* libc/stdio/lib_snprintf.c:  If the size passed to snprintf() is zero,
+	  then snprintf() must write nothing, but instead return the size of the
+	  buffer needed to hold the entire string.  From Sami Pelkonen (2014-5-30).