sortix--sortix/libc/grp/getgrent_r.c

/*
 * Copyright (c) 2013 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * grp/getgrent_r.c
 * Reads a group entry (but not fully thread-securely).
 */

#include <errno.h>
#include <grp.h>

int getgrent_r(struct group* restrict result,
               char* restrict buf,
               size_t buflen,
               struct group** restrict result_pointer)
{
	if ( !result_pointer )
		return errno = EINVAL;
	if ( !__grp_file && !(__grp_file = opengr()) )
		return errno;
	return fgetgrent_r(__grp_file, result, buf, buflen, result_pointer);
}