can_mul.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   can_mul.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kfujita <kfujita@student.42tokyo.jp>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/02/06 19:29:25 by kfujita           #+#    #+#             */
/*   Updated: 2023/05/03 19:35:15 by kfujita          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "ft_math.h"
 
#include <limits.h>
#include <stdint.h>
 
bool    can_mul(int a, int b)
{
    if (a == 0 || b == 0)
        return (true);
    else if ((0 < a && 0 < b) || (a < 0 && b < 0))
        return (b <= (INT_MAX / a));
    else if (b < 0)
        return ((INT_MIN / a) <= b);
    else
        return ((INT_MIN / b) <= a);
}
 
bool    can_mulu(unsigned int a, unsigned int b)
{
    if (a == 0 || b == 0)
        return (true);
    else
        return (b <= (UINT_MAX / a));
}
 
bool    can_mull(long a, long b)
{
    if (a == 0 || b == 0)
        return (true);
    else if ((0 < a && 0 < b) || (a < 0 && b < 0))
        return (b <= (LONG_MAX / a));
    else if (b < 0)
        return ((LONG_MIN / a) <= b);
    else
        return ((LONG_MIN / b) <= a);
}
 
bool    can_mulp(size_t a, size_t b)
{
    if (a == 0 || b == 0)
        return (true);
    else
        return (b <= (UINTPTR_MAX / a));
}