54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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grp/getgrgid_r.c
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Searchs the group database for a group with the given numeric group id.
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*******************************************************************************/
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#include <errno.h>
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#include <grp.h>
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#include <stdio.h>
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int getgrgid_r(gid_t gid,
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struct group* restrict ret,
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char* restrict buf,
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size_t buflen,
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struct group** restrict ret_ptr)
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{
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if ( !ret_ptr )
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return errno = EINVAL;
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if ( !ret || !buf )
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return *ret_ptr = NULL, errno = EINVAL;
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FILE* fgroup = opengr();
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if ( !fgroup )
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return *ret_ptr = NULL, errno;
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int errnum;
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while ( (errnum = fgetgrent_r(fgroup, ret, buf, buflen, ret_ptr)) == 0 &&
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*ret_ptr )
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{
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if ( (*ret_ptr)->gr_gid != gid )
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continue;
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fclose(fgroup);
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return *ret_ptr = *ret_ptr, 0;
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}
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fclose(fgroup);
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return *ret_ptr = NULL, errnum ? errnum : (errno = ENOGROUP);
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}
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