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libbb: move is_in_supplementary_groups() from test to libbb

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function                                             old     new   delta
is_in_supplementary_groups                             -      54     +54
nexpr                                                766     721     -45
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(add/remove: 1/0 grow/shrink: 0/1 up/down: 54/-45)              Total: 9 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2024-10-07 01:20:43 +02:00
parent bb5525613e
commit 748b168154
3 changed files with 26 additions and 19 deletions
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20
libbb/bb_getgroups.c
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@ -45,3 +45,23 @@ gid_t* FAST_FUNC bb_getgroups(int *ngroups, gid_t *group_array)
*ngroups = n;
return group_array;
}
/* Return non-zero if GID is in our supplementary group list. */
int FAST_FUNC is_in_supplementary_groups(int *pngroups, gid_t **pgroup_array, gid_t gid)
{
int i;
int ngroups;
gid_t *group_array;
if (*pngroups == 0)
*pgroup_array = bb_getgroups(pngroups, NULL);
ngroups = *pngroups;
group_array = *pgroup_array;
/* Search through the list looking for GID. */
for (i = 0; i < ngroups; i++)
if (gid == group_array[i])
return 1;
return 0;
}