49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*
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* Copyright (c) 2013, 2014, 2021 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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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 : 0;
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}
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