/*-

 * Copyright (c) 2006 Verdens Gang AS

 * Copyright (c) 2006-2011 Varnish Software AS

 * All rights reserved.

 *

 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * assert(), AN() and AZ() are static checks that should not happen.

 *      In general asserts should be cheap, such as checking return

 *      values and similar.

 * diagnostic() are asserts which are so expensive that we may want

 *      to compile them out for performance at a later date.

 * xxxassert(), XXXAN() and XXXAZ() marks conditions we ought to

 *      handle gracefully, such as malloc failure.

 */

#ifndef VAS_H_INCLUDED

#define VAS_H_INCLUDED

#include <errno.h>

#include <stddef.h>     // size_t

const char * VAS_errtxt(int e);

enum vas_e {

        VAS_WRONG,

        VAS_MISSING,

        VAS_ASSERT,

        VAS_INCOMPLETE,

        VAS_VCL,

};

typedef void vas_f(const char *, const char *, int, const char *, enum vas_e);

extern vas_f *VAS_Fail_Func v_noreturn_;

extern vas_f VAS_Fail v_noreturn_;

#ifdef WITHOUT_ASSERTS

#define assert(e)       ((void)(e))

#else /* WITH_ASSERTS */

#define assert(e)                                                       \

do {                                                                    \

        if (!(e)) {                                                     \

                VAS_Fail(__func__, __FILE__, __LINE__,                  \

                    #e, VAS_ASSERT);                                    \

        }                                                               \

} while (0)

#endif

#define xxxassert(e)                                                    \

do {                                                                    \

        if (!(e)) {                                                     \

                VAS_Fail(__func__, __FILE__, __LINE__,                  \

                    #e, VAS_MISSING);                                   \

        }                                                               \

} while (0)

/* Assert zero return value */

#define AZ(foo)         do { assert((foo) == 0); } while (0)

#define AN(foo)         do { assert((foo) != 0); } while (0)

#define XXXAZ(foo)      do { xxxassert((foo) == 0); } while (0)

#define XXXAN(foo)      do { xxxassert((foo) != 0); } while (0)

#define diagnostic(foo) assert(foo)

#define WRONG(expl)                                                     \

do {                                                                    \

        VAS_Fail(__func__, __FILE__, __LINE__, expl, VAS_WRONG);        \

} while (0)

#define _PTOK(call, var)                                                \

do {                                                                    \

        int var = call;                                                 \

        if (!var)                                                       \

                break;                                                  \

        errno = var;                                                    \

        WRONG(#call " failed");                                         \

} while (0)

#define PTOK(call) _PTOK(call, VUNIQ_NAME(_pterr))

#define INCOMPL()                                                       \

do {                                                                    \

        VAS_Fail(__func__, __FILE__, __LINE__,                          \

            "", VAS_INCOMPLETE);                                        \

} while (0)

/*

 * Most of this nightmare is stolen from FreeBSD's <cdefs.h>

 */

#ifndef __has_extension

#  define __has_extension(x)    0

#endif

#if __STDC_VERSION__ - 0 >= 202311L

#   define v_static_assert static_assert

#elif __STDC_VERSION__ - 0 >= 201112L

#   define v_static_assert _Static_assert

#elif __has_extension(c_static_assert)

#   define v_static_assert _Static_assert

#elif __GNUC_PREREQ__(4,6) && !defined(__cplusplus)

#   define v_static_assert _Static_assert

#else

#   if defined(__COUNTER__)

#       define v_static_assert(x, y)    __v_static_assert(x, __COUNTER__)

#   else

#       define v_static_assert(x, y)    __v_static_assert(x, __LINE__)

#   endif

#   define __v_static_assert(x, y)      ___v_static_assert(x, y)

#   define ___v_static_assert(x, y) \

                typedef char __vassert_## y[(x) ? 1 : -1] v_unused_

#endif

/*

 * A normal pointer difference is signed, but when we don't want a negative

 * value this little tool will make sure we don't get that.

 */

static inline size_t

{

}

#endif