From d4e26c1d59f7e69bd71c92b93c033e197a38a782 Mon Sep 17 00:00:00 2001
From: Mikhail Osipov <mike.osipov@gmail.com>
Date: Thu, 6 Feb 2020 14:06:18 +0300
Subject: init

---
 defer.h        | 20 ++++++++++++++++++++
 tests/Makefile |  9 +++++++++
 tests/defer.c  | 12 ++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 defer.h
 create mode 100644 tests/Makefile
 create mode 100644 tests/defer.c

diff --git a/defer.h b/defer.h
new file mode 100644
index 0000000..91e45a2
--- /dev/null
+++ b/defer.h
@@ -0,0 +1,20 @@
+#ifndef __DEFER_H__
+#define __DEFER_H__
+
+#ifndef __unused
+#define __unused	__attribute__((unused))
+#endif
+
+#define __cleanup(f)	__attribute__((cleanup(f)))
+
+#define CAT(a, b)	CAT_(a, b)
+#define CAT_(a, b)	a ## b
+
+#define UNIQ(name)	CAT(name, __LINE__)
+
+#define defer						\
+    auto void UNIQ(defer_func)(int *);			\
+    int UNIQ(defer_var) __cleanup(UNIQ(defer_func));	\
+    void UNIQ(defer_func)(int *__arg __unused)
+
+#endif
diff --git a/tests/Makefile b/tests/Makefile
new file mode 100644
index 0000000..166ee66
--- /dev/null
+++ b/tests/Makefile
@@ -0,0 +1,9 @@
+defer: defer.o
+	gcc -o $@ $<
+
+%.o: %.c
+	gcc -c -I.. -o $@ $<
+
+clean:
+	@echo cleaning...
+	@rm -f *.o
diff --git a/tests/defer.c b/tests/defer.c
new file mode 100644
index 0000000..d5f75d7
--- /dev/null
+++ b/tests/defer.c
@@ -0,0 +1,12 @@
+#include "defer.h"
+
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	defer { printf("exit\n"); }
+
+	printf("Hello World!\n");
+
+	return 0;
+}
-- 
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