builtin_exit.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   builtin_exit.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hgenc <hgenc@student.42kocaeli.com.tr>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/17 18:47:00 by hgenc             #+#    #+#             */
/*   Updated: 2026/01/18 17:23:00 by hgenc            ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "../../include/minishell.h"
#include <stdlib.h>
#include <unistd.h>
 
 
static int  is_numeric(char *str)
{
    int i;
 
    i = 0;
    if (str[i] == '+' || str[i] == '-')
        i++;
    if (!str[i])
        return (0);
    while (str[i])
    {
        if (!ft_isdigit(str[i]))
            return (0);
        i++;
    }
    return (1);
}
 
static int  check_overflow(unsigned long long num, char digit)
{
    if (num > LLONG_MAX_VAL / 10)
        return (1);
    if (num == LLONG_MAX_VAL / 10
        && (unsigned long long)(digit - '0') > LLONG_MAX_VAL % 10)
        return (1);
    return (0);
}
 
static int  get_exit_code(char *str)
{
    unsigned long long  num;
    int                 sign;
    int                 i;
 
    num = 0;
    sign = 1;
    i = 0;
    if (str[i] == '-')
    {
        sign = -1;
        i++;
    }
    else if (str[i] == '+')
        i++;
    while (str[i])
    {
        if (check_overflow(num, str[i]))
            return (-1);
        num = num * 10 + (str[i] - '0');
        i++;
    }
    return ((int)(((long long)(num * sign) % 256 + 256) % 256));
}
 
static void exit_numeric_error(t_shell *shell, char *arg)
{
    shell_error("exit", arg, "numeric argument required");
    shell_exit(shell, 2);
}
 
int builtin_exit(t_shell *shell, t_cmd *cmd)
{
    int exit_code;
 
    ft_putendl_fd("exit", STDERR_FILENO);
    if (!cmd->args[1])
        shell_exit(shell, shell->exit_status);
    if (cmd->args[2])
    {
        if (!is_numeric(cmd->args[1]))
            exit_numeric_error(shell, cmd->args[1]);
        shell_error("exit", NULL, "too many arguments");
        return (2);
    }
    if (!is_numeric(cmd->args[1]))
        exit_numeric_error(shell, cmd->args[1]);
    exit_code = get_exit_code(cmd->args[1]);
    if (exit_code == -1)
        exit_numeric_error(shell, cmd->args[1]);
    shell_exit(shell, exit_code);
    return (0);
}