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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2003-2025 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
/* MH ali command */
#include <mh.h>
#ifdef HAVE_TERMIOS_H
# include <termios.h>
#endif
#include <sys/ioctl.h>
#include <sys/stat.h>
static char prog_doc[] = N_("List mail aliases");
static char args_doc[] = N_("ALIAS [ALIAS...]");
static int list_mode;
static int user_mode;
static int normalize_mode;
static int nolist_mode;
static void
alias_handler (struct mu_parseopt *po, struct mu_option *opt, char const *arg)
{
mh_alias_read (arg, 1);
}
static struct mu_option options[] = {
{ "alias", 0, N_("FILE"), MU_OPTION_DEFAULT,
N_("use the additional alias FILE"),
mu_c_string, NULL, alias_handler },
{ "noalias", 0, NULL, 0,
N_("do not read the system alias file"),
mu_c_int, &nolist_mode, NULL, "1" },
{ "list", 0, NULL, MU_OPTION_DEFAULT,
N_("list each address on a separate line"),
mu_c_bool, &list_mode },
{ "normalize", 0, NULL, MU_OPTION_DEFAULT,
N_("try to determine the official hostname for each address"),
mu_c_bool, &normalize_mode },
{ "user", 0, NULL, MU_OPTION_DEFAULT,
N_("list the aliases that expand to given addresses"),
mu_c_bool, &user_mode },
MU_OPTION_END
};
static int
getcols (void)
{
struct winsize ws;
ws.ws_col = ws.ws_row = 0;
if ((ioctl(1, TIOCGWINSZ, (char *) &ws) < 0) || ws.ws_row == 0)
{
const char *columns = getenv ("COLUMNS");
if (columns)
ws.ws_col = strtol (columns, NULL, 10);
}
if (ws.ws_col == 0)
ws.ws_col = 80;
return ws.ws_col;
}
static void
ali_print_name_list (mu_list_t list, int off)
{
mu_iterator_t itr;
char *item;
mu_list_get_iterator (list, &itr);
if (list_mode)
{
for (mu_iterator_first (itr);
!mu_iterator_is_done (itr); mu_iterator_next (itr))
{
mu_iterator_current (itr, (void **)&item);
printf ("%s\n", item);
}
}
else
{
int ncol = getcols ();
int n = off;
int i = 0;
for (mu_iterator_first (itr), i = 0;
!mu_iterator_is_done (itr);
mu_iterator_next (itr), i++)
{
int len;
if (i > 0)
n += printf (", ");
mu_iterator_current (itr, (void **)&item);
len = strlen (item) + 2;
if (n + len > ncol)
n = printf ("\n ");
len = printf ("%s", item);
n += len;
}
printf ("\n");
}
mu_iterator_destroy (&itr);
}
static int
ali_print_alias (char *name, mu_list_t alias, void *data MU_ARG_UNUSED)
{
int n;
if (name)
n = printf ("%s: ", name);
else
n = 0;
ali_print_name_list (alias, n);
return 0;
}
static void
ali_print_name (char *name)
{
printf ("%s\n", name);
}
int
main (int argc, char **argv)
{
mh_getopt (&argc, &argv, options, 0, args_doc, prog_doc, NULL);
if (!nolist_mode)
mh_read_aliases ();
if (!user_mode)
{
if (argc == 0)
mh_alias_enumerate (ali_print_alias, NULL);
else
{
int i;
for (i = 0; i < argc; i++)
{
mu_list_t al = NULL;
if (mh_alias_get (argv[i], &al) == 0)
{
ali_print_alias (NULL, al, NULL);
mu_list_destroy (&al);
}
else
ali_print_name (argv[i]);
}
}
}
else
{
if (argc == 0)
{
mu_error ("List of addresses is not given");
exit (1);
}
else
{
int i;
for (i = 0; i < argc; i++)
{
mu_list_t nl = NULL;
if (mh_alias_get_alias (argv[i], &nl) == 0)
{
ali_print_name_list (nl, 0);
mu_list_destroy (&nl);
}
else
printf ("%s\n", argv[i]);
}
}
}
return 0;
}
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