math.h

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/*
 * Copyright (C) 2022 ML!PA Consulting GmbH
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#ifdef __cplusplus
extern "C" {
#endif

#define SIGNOF(a) _Generic(a, unsigned char: 1,          \
                              unsigned short: 1,         \
                              unsigned int: 1,           \
                              unsigned long: 1,          \
                              unsigned long long: 1,     \
                              default: ((a) <= 0 ? ((a) == 0 ? 1L : -1L ): 1L))

#define DIV_ROUND(a, b)  ((SIGNOF(a) * ((SIGNOF(a) * (a)) + (SIGNOF(b) * (b)) / 2) / (b)))

#define DIV_ROUND_UP(a, b) ((SIGNOF(a)>0 && SIGNOF(b)>0) ? (((a) + (b) - 1) / (b)):\
                            (SIGNOF(a)<0 && SIGNOF(b)<0) ? (((a) + (b) + 1) / (b)): (a) / (b))

#define DIV_ROUND_INF(a, b) (SIGNOF(a) * (((SIGNOF(a) * (a)) + (SIGNOF(b) * (b)) - 1) / (b)))

#define MATH_ALIGN(num, chunk) ((chunk) * DIV_ROUND_INF(num, chunk))
 
#ifdef __cplusplus
}
#endif