From 1bb00adc37479070c2d9a3c767c95304881a0db8 Mon Sep 17 00:00:00 2001
From: Roman Zeyde <roman.zeyde@gmail.com>
Date: Mon, 24 Aug 2015 13:47:27 +0300
Subject: [PATCH] fsm: add compile-time assert for response size validation

ttps://gcc.gnu.org/gcc-4.6/changes.html
---
 firmware/fsm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/firmware/fsm.c b/firmware/fsm.c
index 837dc5f..fa9a5d9 100644
--- a/firmware/fsm.c
+++ b/firmware/fsm.c
@@ -51,7 +51,9 @@
 
 static uint8_t msg_resp[MSG_OUT_SIZE];
 
-#define RESP_INIT(TYPE) TYPE *resp = (TYPE *)msg_resp; memset(resp, 0, sizeof(TYPE));
+#define RESP_INIT(TYPE) TYPE *resp = (TYPE *)msg_resp; \
+			_Static_assert(sizeof(msg_resp) >= sizeof(TYPE), #TYPE " is too large"); \
+			memset(resp, 0, sizeof(TYPE));
 
 void fsm_sendSuccess(const char *text)
 {