Rename libkmod-util.h to macro.h
diff --git a/libkmod/macro.h b/libkmod/macro.h
new file mode 100644
index 0000000..4c8f543
--- /dev/null
+++ b/libkmod/macro.h
@@ -0,0 +1,58 @@
+/*
+ * libkmod - interface to kernel module operations
+ *
+ * Copyright (C) 2011 ProFUSION embedded systems
+ * Copyright (C) 2011 Lucas De Marchi <lucas.de.marchi@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _LIBKMOD_MACRO_H_
+#define _LIBKMOD_MACRO_H_
+
+#include <stddef.h>
+
+#define BUILD_ASSERT(cond) \
+ do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
+
+#define EXPR_BUILD_ASSERT(cond) \
+ (sizeof(char [1 - 2*!(cond)]) - 1)
+
+#if HAVE_TYPEOF
+#define check_type(expr, type) \
+ ((typeof(expr) *)0 != (type *)0)
+
+#define check_types_match(expr1, expr2) \
+ ((typeof(expr1) *)0 != (typeof(expr2) *)0)
+#else
+/* Without typeof, we can only test the sizes. */
+#define check_type(expr, type) \
+ EXPR_BUILD_ASSERT(sizeof(expr) == sizeof(type))
+
+#define check_types_match(expr1, expr2) \
+ EXPR_BUILD_ASSERT(sizeof(expr1) == sizeof(expr2))
+#endif /* HAVE_TYPEOF */
+
+#define container_of(member_ptr, containing_type, member) \
+ ((containing_type *) \
+ ((char *)(member_ptr) - offsetof(containing_type, member)) \
+ - check_types_match(*(member_ptr), ((containing_type *)0)->member))
+
+#define __must_check __attribute__((warn_unused_result))
+#define __printf_format(a,b) __attribute__((format (printf, a, b)))
+#if !defined(__always_inline)
+#define __always_inline __inline__ __attribute__((always_inline))
+#endif
+
+#endif