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/**
* slibc — Yet another C library
* Copyright © 2015 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ASSERT_H
#define _ASSERT_H
#include <slibc/version.h>
#include <slibc/features.h>
/* The `assert` macro shall be redefined according to the the
* current state of `NDEBUF` each time <assert.h> is included. */
#ifdef assert
# undef assert
#endif
/**
* Unless `NDEBUG` is defined, print an error message
* and abort the process, if the expression evaluates to
* non-zero.
*
* POSIX specifies that `assert` shall not evaluate the
* expression if `NDEBUG` is defined. This is probably
* to save CPU-cycles.
*/
#ifdef NDEBUG
# define assert(expression) ((void)0)
#else
# define assert(expression) \
((void)((expression) ? 0 : (__assert_fail(#expression, 0, __FILE__, __LINE__, __func__), 0)))
#endif
/**
* A compile-time error should occur if the expression
* evaluates to zero.
*
* @param expression:scalar The expression to evaluate.
* @param message:const char* The message to print on error.
*/
#define static_assert _Static_assert
/**
* Unless `NDEBUG` is defined, print an error message
* and abort the process, if `errnum` is non-zero.
*
* @param errnum:int The error code, describing the error that occurred.
*
* `assert_perror` is a GNU extension.
*/
#if defined(_SLIBC_SOURCE) || defined(_GNU_SOURCE)
#ifdef assert_perror
# undef assert_perror
#endif
#ifdef NDEBUG
# define assert_perror(errnum) ((void)0)
#else
# define assert_perror(errnum) \
((void)((errnum == 0) ? 0 : (__assert_fail(NULL, errnum, __FILE__, __LINE__, __func__), 0)))
#endif
/**
* The function that is called if an assertion fails.
*
* @param expression The expression that failed, `NULL` if `assert_perror` failed
* @param errnum The code of the fatal error, 0 if `assert` failed
* @param file The filename of the source cose whence the assertion was made
* @param line The line in the source code whence the assertion was made
* @param func The function in the source code whence the assertion was made
*/
void __assert_fail(const char* expression, int errnum, const char* file, int line, const char* func)
__noreturn __GCC_ONLY(__attribute__((nonnull(3, 4, 5))));
#endif
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