/**
* 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/>.
*/
#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.
*
* @etymology (Assert)ion.
*/
#ifdef NDEBUG
# define assert(expression) ((void)0)
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define assert(expression) \
((void)((expression) ? 0 : (__assert_fail(#expression, 0, __FILE__, __LINE__, __func__), 0)))
#else
# define assert(expression) \
((void)((expression) ? 0 : (__assert_fail(#expression, 0, __FILE__, __LINE__, NULL), 0)))
#endif
#if defined(__SLIBC_SOURCE) || defined(__GNU_SOURCE)
/**
* Unless `NDEBUG` is defined, print an error message
* and abort the process, if `errnum` is non-zero.
*
* `assert_perror` is a GNU-compliant slibc extension.
*
* @etymology (`assert`) version of (`perror`).
*
* @param errnum:int The error code, describing the error that occurred.
*/
# ifdef assert_perror
# undef assert_perror
# endif
# ifdef NDEBUG
# define assert_perror(errnum) ((void)0)
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define assert_perror(errnum) \
((void)((errnum == 0) ? 0 : (__assert_fail(NULL, errnum, __FILE__, __LINE__, __func__), 0)))
# else
# define assert_perror(errnum) \
((void)((errnum == 0) ? 0 : (__assert_fail(NULL, errnum, __FILE__, __LINE__, NULL), 0)))
# endif
#endif
/* The definitions above shall be redefined at any time this header file
* is included. The definitions below are static, and thus guarded. */
#ifndef _ASSERT_H
#define _ASSERT_H
#if defined(__C11__)
/**
* A compile-time error should occur if the expression
* evaluates to zero.
*
* @etymology (Static) (assert)tion.
*
* @param expression:scalar The expression to evaluate.
* @param message:const char* The message to print on error.
*/
# define static_assert _Static_assert
#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,
* `NULL` if unknown (C99 is required.)
*/
__noreturn void __assert_fail(const char*, int, const char*, int, const char*)
__GCC_ONLY(__attribute__((__nonnull__(3, 5))));
#endif
