From f7860e788d1ae58f35f72d3de8ad9f6d684de71b Mon Sep 17 00:00:00 2001
From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Fri, 1 Nov 2019 02:18:31 +0100
Subject: [PATCH 78/82] v4l2: add shorthand macros for v4l2 type checks

Some wrappers for common static_assert checks.

* v4l2.c (CHECK_V4L2_STRUCT_SIZE, CHECK_V4L2_RESERVED_SIZE.
CHECK_V4L2_STRUCT_RESERVED_SIZE): New macros.
---
 v4l2.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/v4l2.c b/v4l2.c
index 1e01fa6..b45f7f8 100644
--- a/v4l2.c
+++ b/v4l2.c
@@ -15,6 +15,24 @@
 #include <linux/types.h>
 #include <linux/videodev2.h>
 
+#include "static_assert.h"
+
+#define CHECK_V4L2_STRUCT_SIZE(s_) \
+	static_assert(sizeof(struct s_) == sizeof(struct_##s_), \
+		      "Unexpected struct " #s_ " size")
+#define CHECK_V4L2_STRUCT_SIZE_LE(s_) \
+	static_assert(sizeof(struct s_) <= sizeof(struct_##s_), \
+		      "Unexpected struct " #s_ " size, " \
+		      "please update the decoder")
+#define CHECK_V4L2_RESERVED_SIZE(s_) \
+	static_assert(sizeof_field(struct s_, reserved) \
+		      >= sizeof_field(struct_##s_, reserved), \
+		      "Unexpected struct " #s_ ".reserved size, " \
+		      "please update the decoder")
+#define CHECK_V4L2_STRUCT_RESERVED_SIZE(s_) \
+	CHECK_V4L2_STRUCT_SIZE(s_); \
+	CHECK_V4L2_RESERVED_SIZE(s_)
+
 #include DEF_MPERS_TYPE(struct_v4l2_buffer)
 #include DEF_MPERS_TYPE(struct_v4l2_clip)
 #ifdef VIDIOC_CREATE_BUFS
-- 
2.1.4