/*-

 * 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 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 __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

pdiff(const void *b, const void *e)

{

  AN(b);

  AN(e);

  assert(b <= e);

  return ((size_t)((const char *)e - (const char *)b));

}

Unexecuted instantiation: vas.c:pdiff

Unexecuted instantiation: vct.c:pdiff

Unexecuted instantiation: vsb.c:pdiff

#endif