can_add.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   can_add.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kfujita <kfujita@student.42tokyo.jp>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/02/06 19:14:07 by kfujita           #+#    #+#             */
/*   Updated: 2023/05/03 19:35:16 by kfujita          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "ft_math.h"
 
#include <limits.h>
#include <stdint.h>
 
bool    can_add(int a, int b)
{
    if ((a <= 0 && 0 <= b) || (b <= 0 && 0 <= a))
        return (true);
    else if (0 < a)
        return (b <= (INT_MAX - a));
    else
        return ((INT_MIN - a) <= b);
}
 
bool    can_addu(unsigned int a, unsigned int b)
{
    return (b <= (UINT_MAX - a));
}
 
bool    can_addl(long a, long b)
{
    if ((a <= 0 && 0 <= b) || (b <= 0 && 0 <= a))
        return (true);
    else if (0 < a)
        return (b <= (LONG_MAX - a));
    else
        return ((LONG_MIN - a) <= b);
}
 
bool    can_addp(size_t a, size_t b)
{
    return (b <= (UINTPTR_MAX - a));
}