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sortix--sortix/libc/grp/getgrgid_r.cpp
2014-05-16 14:06:36 +02:00

54 lines
1.7 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
grp/getgrgid_r.cpp
Searchs the group database for a group with the given numeric group id.
*******************************************************************************/
#include <errno.h>
#include <grp.h>
#include <stdio.h>
extern "C"
int getgrgid_r(gid_t gid,
struct group* restrict ret,
char* restrict buf,
size_t buflen,
struct group** restrict ret_ptr)
{
if ( !ret_ptr )
return errno = EINVAL;
if ( !ret || !buf )
return *ret_ptr = NULL, errno = EINVAL;
FILE* fgroup = opengr();
if ( !fgroup )
return *ret_ptr = NULL, errno;
int errnum;
while ( (errnum = fgetgrent_r(fgroup, ret, buf, buflen, ret_ptr)) == 0 &&
*ret_ptr )
{
if ( (*ret_ptr)->gr_gid != gid )
continue;
fclose(fgroup);
return *ret_ptr = *ret_ptr, 0;
}
fclose(fgroup);
return *ret_ptr = NULL, errnum ? errnum : (errno = ENOGROUP);
}