1 /* group-list.c --Print a list of group IDs or names.
2 Copyright (C) 1989-2023 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 /* Written by Arnold Robbins.
18 Major rewrite by David MacKenzie, djm@gnu.ai.mit.edu.
19 Extracted from id.c by James Youngman. */
23 #include <sys/types.h>
29 #include "mgetgroups.h"
31 #include "group-list.h"
34 /* Print all of the distinct groups the user is in. */
36 print_group_list (char const *username
,
37 uid_t ruid
, gid_t rgid
, gid_t egid
,
38 bool use_names
, char delim
)
41 struct passwd
*pwd
= NULL
;
45 pwd
= getpwuid (ruid
);
50 if (!print_group (rgid
, use_names
))
56 if (!print_group (egid
, use_names
))
63 int n_groups
= xgetgroups (username
, (pwd
? pwd
->pw_gid
: egid
), &groups
);
68 error (0, errno
, _("failed to get groups for user %s"),
73 error (0, errno
, _("failed to get groups for the current process"));
78 for (int i
= 0; i
< n_groups
; i
++)
79 if (groups
[i
] != rgid
&& groups
[i
] != egid
)
82 if (!print_group (groups
[i
], use_names
))
90 /* Convert a gid_t to string. Do not use this function directly.
91 Instead, use it via the gidtostr macro.
92 Beware that it returns a pointer to static storage. */
94 gidtostr_ptr (gid_t
const *gid
)
96 static char buf
[INT_BUFSIZE_BOUND (uintmax_t)];
97 return umaxtostr (*gid
, buf
);
99 #define gidtostr(g) gidtostr_ptr (&(g))
101 /* Print the name or value of group ID GID. */
103 print_group (gid_t gid
, bool use_name
)
105 struct group
*grp
= NULL
;
110 grp
= getgrgid (gid
);
113 error (0, 0, _("cannot find name for group ID %lu"),
114 (unsigned long int) gid
);
119 char *s
= grp
? grp
->gr_name
: gidtostr (gid
);