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get_flag_options.c
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get_flag_options.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* flag_utilities.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: kblack <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2019/03/05 13:24:49 by kblack #+# #+# */
/* Updated: 2019/03/05 22:30:21 by kblack ### ########.fr */
/* */
/* ************************************************************************** */
#include "ft_ls.h"
/*
** flag_option_error prints an error message when the user inputs an invalid
** flag/option
*/
void flag_option_error(char av)
{
ft_putstr("ls: illegal option -- ");
ft_putchar(av);
ft_putchar('\n');
ft_putstr("usage: ls [-");
ft_putstr(FLAG);
ft_putstr("] [file ...]");
ft_putchar('\n');
exit(-1);
}
/*
** flag_handler uses bit masking to signal what flags the user is specifying
** this value is saved in "flags" and passed throughout the program
*/
int flag_handler(char *av)
{
int i;
int flags;
i = 0;
flags = 0;
while (av[++i])
{
if (!(ft_strchr(FLAG, av[i])))
flag_option_error(av[i]);
av[i] == 'a' ? BIT_ON(flags, OPT_a) : 0;
av[i] == 'l' ? BIT_ON(flags, OPT_l) : 0;
av[i] == 'R' ? BIT_ON(flags, OPT_R) : 0;
av[i] == 'r' ? BIT_ON(flags, OPT_r) : 0;
av[i] == 't' ? BIT_ON(flags, OPT_t) : 0;
}
return (flags);
}