/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include_next <assert.h>

#ifndef _LIBSPL_ASSERT_H
#define	_LIBSPL_ASSERT_H

#include <stdio.h>
#include <stdlib.h>

#ifndef __assert_c99
static inline void
__assert_c99(const char *expr, const char *file, int line, const char *func)
{
	fprintf(stderr, "%s:%i: %s: Assertion `%s` failed.\n",
		file, line, func, expr);
	abort();
}
#endif  /* __assert_c99 */

#ifndef verify
#if defined(__STDC__)
#if __STDC_VERSION__ - 0 >= 199901L
#define	verify(EX) (void)((EX) || \
	(__assert_c99(#EX, __FILE__, __LINE__, __func__), 0))
#else
#define	verify(EX) (void)((EX) || (__assert(#EX, __FILE__, __LINE__), 0))
#endif  /* __STDC_VERSION__ - 0 >= 199901L */
#else
#define	verify(EX) (void)((EX) || (_assert("EX", __FILE__, __LINE__), 0))
#endif	/* __STDC__ */
#endif  /* verify */

#undef VERIFY
#undef ASSERT

#define	VERIFY	verify
#define	ASSERT	assert

extern void __assert(const char *, const char *, int);

static inline int
assfail(const char *buf, const char *file, int line)
{
	__assert(buf, file, line);
	return (0);
}

/* BEGIN CSTYLED */
#define	VERIFY3_IMPL(LEFT, OP, RIGHT, TYPE) do { \
	const TYPE __left = (TYPE)(LEFT); \
	const TYPE __right = (TYPE)(RIGHT); \
	if (!(__left OP __right)) { \
		char *__buf = alloca(256); \
		(void) snprintf(__buf, 256, "%s %s %s (0x%llx %s 0x%llx)", \
			#LEFT, #OP, #RIGHT, \
			(u_longlong_t)__left, #OP, (u_longlong_t)__right); \
		assfail(__buf, __FILE__, __LINE__); \
	} \
} while (0)
/* END CSTYLED */

#define	VERIFY3S(x, y, z)	VERIFY3_IMPL(x, y, z, int64_t)
#define	VERIFY3U(x, y, z)	VERIFY3_IMPL(x, y, z, uint64_t)
#define	VERIFY3P(x, y, z)	VERIFY3_IMPL(x, y, z, uintptr_t)
#define	VERIFY0(x)		VERIFY3_IMPL(x, ==, 0, uint64_t)

#ifdef NDEBUG
#define	ASSERT3S(x, y, z)	((void)0)
#define	ASSERT3U(x, y, z)	((void)0)
#define	ASSERT3P(x, y, z)	((void)0)
#define	ASSERT0(x)		((void)0)
#define	ASSERTV(x)
#define	IMPLY(A, B)		((void)0)
#define	EQUIV(A, B)		((void)0)
#else
#define	ASSERT3S(x, y, z)	VERIFY3S(x, y, z)
#define	ASSERT3U(x, y, z)	VERIFY3U(x, y, z)
#define	ASSERT3P(x, y, z)	VERIFY3P(x, y, z)
#define	ASSERT0(x)		VERIFY0(x)
#define	ASSERTV(x)		x
#define	IMPLY(A, B) \
	((void)(((!(A)) || (B)) || \
	    assfail("(" #A ") implies (" #B ")", __FILE__, __LINE__)))
#define	EQUIV(A, B) \
	((void)((!!(A) == !!(B)) || \
	    assfail("(" #A ") is equivalent to (" #B ")", __FILE__, __LINE__)))

#endif  /* NDEBUG */

#endif  /* _LIBSPL_ASSERT_H */