42-minishell/builtin_exit.c at main · torus/42-minishell · GitHub

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#include <limits.h>
#include "minishell.h"
#include "builtin.h"
#include "env.h"
#include "libft/libft.h"

static void	put_exit_errmsg_and_exit(char *exit_status)
{
	char	*tmp;

	tmp = ft_strjoin(exit_status, ": numeric argument required");
	check_malloc_has_succeeded("exit", tmp);
	put_minish_err_msg_and_exit(2, "exit", tmp);
}

static void	exit_atol(char *str)
{
	char	*nptr;
	long	num;
	int		sign;

	nptr = str;
	sign = 1;
	num = 0;
	while (*nptr == ' ' || *nptr == '\t' || *nptr == '\f'
		|| *nptr == '\r' || *nptr == '\n' || *nptr == '\v')
		nptr++;
	if (*nptr == '-')
	{
		sign = -1;
		nptr++;
	}
	if (!ft_isdigit(*nptr) || is_long_overflow(nptr, sign))
		put_exit_errmsg_and_exit(str);
	while (ft_isdigit(*nptr))
		num = num * 10 + (*nptr++ - '0');
	while (*nptr == ' ' || *nptr == '\t' || *nptr == '\f'
		|| *nptr == '\r' || *nptr == '\n' || *nptr == '\v')
		nptr++;
	if (*nptr)
		put_exit_errmsg_and_exit(str);
	exit((sign * num) & 255);
}

/*
 * builtin exit command
 * argv: ["exit", "0"]
 */
int	builtin_exit(char **argv)
{
	int	argv_len;

	argv_len = ptrarr_len((void **)argv);
	if (argv_len > 2)
		return (put_minish_err_msg_and_ret(1, "exit", "too many arguments"));
	else if (argv_len == 2)
		exit_atol(argv[1]);
	else
		exit(g_shell.status);
	return (0);
}