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/*-
* 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
pdiff(const void *b, const void *e)
{
AN(b);
AN(e);
assert(b <= e);
return ((size_t)((const char *)e - (const char *)b));
}
#endif
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