/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#define OVS_TYPEOF(OBJECT) void *
#endif
+/* Given OBJECT of type pointer-to-structure, expands to the offset of MEMBER
+ * within an instance of the structure.
+ *
+ * The GCC-specific version avoids the technicality of undefined behavior if
+ * OBJECT is null, invalid, or not yet initialized. This makes some static
+ * checkers (like Coverity) happier. But the non-GCC version does not actually
+ * dereference any pointer, so it would be surprising for it to cause any
+ * problems in practice.
+ */
+#ifdef __GNUC__
+#define OBJECT_OFFSETOF(OBJECT, MEMBER) offsetof(typeof(*(OBJECT)), MEMBER)
+#else
+#define OBJECT_OFFSETOF(OBJECT, MEMBER) \
+ ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))
+#endif
+
/* Given POINTER, the address of the given MEMBER in a STRUCT object, returns
the STRUCT object. */
#define CONTAINER_OF(POINTER, STRUCT, MEMBER) \
* from the type of '*OBJECT'. */
#define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \
((OVS_TYPEOF(OBJECT)) (void *) \
- ((char *) (POINTER) - ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))))
+ ((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER)))
+
+/* Given POINTER, the address of the given MEMBER within an object of the type
+ * that that OBJECT points to, assigns the address of the outer object to
+ * OBJECT, which must be an lvalue.
+ *
+ * Evaluates to 1. */
+#define ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER) \
+ ((OBJECT) = OBJECT_CONTAINING(POINTER, OBJECT, MEMBER), 1)
#ifdef __cplusplus
extern "C" {
void *x2nrealloc(void *p, size_t *n, size_t s);
void ovs_strlcpy(char *dst, const char *src, size_t size);
+void ovs_strzcpy(char *dst, const char *src, size_t size);
+void ovs_abort(int err_no, const char *format, ...)
+ PRINTF_FORMAT(2, 3) NO_RETURN;
void ovs_fatal(int err_no, const char *format, ...)
PRINTF_FORMAT(2, 3) NO_RETURN;
+void ovs_fatal_valist(int err_no, const char *format, va_list)
+ PRINTF_FORMAT(2, 0) NO_RETURN;
void ovs_error(int err_no, const char *format, ...) PRINTF_FORMAT(2, 3);
+void ovs_error_valist(int err_no, const char *format, va_list)
+ PRINTF_FORMAT(2, 0);
+const char *ovs_retval_to_string(int);
void ovs_hex_dump(FILE *, const void *, size_t, uintptr_t offset, bool ascii);
bool str_to_int(const char *, int base, int *);