minishell/src/ft_errno.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_errno.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/02/21 12:40:46 by khais             #+#    #+#             */
/*   Updated: 2025/03/21 16:18:57 by jguelen          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_errno.h"
#include "libft.h"
#include <stdio.h>
#include <unistd.h>

/*
** get or set ft_errno
**
** if errno is FT_EGET, return ft_errno and do not set it
**
** else set ft_errno to errno, and return the previous value of ft_errno
*/
t_errno	ft_errno(t_errno errno)
{
	static t_errno	ft_errno = FT_ESUCCESS;
	t_errno			ft_errno_backup;

	if (errno != FT_EGET)
	{
		ft_errno_backup = ft_errno;
		ft_errno = errno;
		return (ft_errno_backup);
	}
	return (ft_errno);
}

/*
** get the current value of ft_errno
*/
t_errno	ft_errno_get(void)
{
	return (ft_errno(FT_EGET));
}

char	*ft_strerror(t_errno errno)
{
	static char	*strs[] = {
	[FT_ESUCCESS] = "Success",
	[FT_EINVAL] = "Invalid argument",
	[FT_EBADID] = "Bad identifier",
	[FT_EUNEXPECTED_PIPE] = "minishell: syntax error near unexpected token `|'",
	[FT_EMALFORMED_REDIRECTION] = "minishell: malformed redirection (perhaps a \
	 missing filename)",
	[FT_ENOMEM] = "Cannot allocate memory",
	[FT_STATFAIL] = "minishell: stat: internal failure",
	[FT_ISDIR] = "Is a directory",
	};

	if (errno >= 0 && errno < FT_EMAXERRNO)
		return (strs[errno]);
	return ("Invalid error code");
}

t_errno	ft_perror(char *desc)
{
	if (ft_errno_get() == FT_EERRNO)
		perror(desc);
	else
	{
		if (desc != NULL && desc[0] != '\0')
			ft_dprintf(STDERR_FILENO, "%s: ", desc);
		ft_dprintf(STDERR_FILENO, "%s\n", ft_strerror(ft_errno_get()));
	}
	return (ft_errno_get());
}