libc/include/assert.h

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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.
 */

/**
 * @file assert.h
 * @brief Assertions.
 *
 * There's no include guard in this file because <assert.h> may usefully be
 * included multiple times, with and without NDEBUG defined.
 */

#include <sys/cdefs.h>

#undef assert

#ifdef NDEBUG
/**
 * assert() does nothing when NDEBUG is defined.
 */
# define assert(...) ((void) 0)
#else
/**
 * assert() aborts the program after logging an error message, if the
 * expression evaluates to false.
 *
 * On Android, the error goes to both stderr and logcat.
 */
# define assert(...) \
    ((__VA_ARGS__) \
        ? (void) 0 \
        : __assert2(__FILE__, __LINE__, __PRETTY_FUNCTION__, #__VA_ARGS__))
#endif

/* `static_assert` is a keyword in C++11 and C23; C11 had `_Static_assert` instead. */
#if !defined(__cplusplus) && (__STDC_VERSION__ >= 201112L && __STDC_VERSION__ < 202311L)
# undef static_assert
# define static_assert _Static_assert
#endif

__BEGIN_DECLS

/**
 * __assert() was called by assert() on failure when compiled for C89.
 * Most users want assert() instead, but this can be useful for reporting other failures.
 */
void __assert(const char* _Nonnull __file, int __line, const char* _Nonnull __msg) __noreturn;

/**
 * __assert2() is called by assert() on failure. Most users want assert()
 * instead, but this can be useful for reporting other failures.
 */
void __assert2(const char* _Nonnull __file, int __line, const char* _Nonnull __function, const char* _Nonnull __msg) __noreturn;

__END_DECLS