NetBSD/lib/libc/gen/getgrouplist.c

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/* $NetBSD: getgrouplist.c,v 1.15 2000/01/22 22:19:10 mycroft Exp $ */
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/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
#if 0
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static char sccsid[] = "@(#)getgrouplist.c 8.2 (Berkeley) 12/8/94";
#else
__RCSID("$NetBSD: getgrouplist.c,v 1.15 2000/01/22 22:19:10 mycroft Exp $");
#endif
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#endif /* LIBC_SCCS and not lint */
/*
* get credential
*/
#include "namespace.h"
#include <sys/param.h>
#include <assert.h>
#include <grp.h>
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#include <string.h>
#include <unistd.h>
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#ifdef __weak_alias
__weak_alias(getgrouplist,_getgrouplist)
#endif
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int
getgrouplist(uname, agroup, groups, grpcnt)
const char *uname;
gid_t agroup;
gid_t *groups;
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int *grpcnt;
{
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struct group *grp;
int i, ngroups;
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int ret, maxgroups;
_DIAGASSERT(uname != NULL);
_DIAGASSERT(groups != NULL);
_DIAGASSERT(grpcnt != NULL);
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ret = 0;
ngroups = 0;
maxgroups = *grpcnt;
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/*
* install primary group
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*/
if (ngroups < maxgroups)
groups[ngroups] = agroup;
else
ret = -1;
ngroups++;
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/*
* Scan the group file to find additional groups.
*/
setgrent();
nextgroup:
while ((grp = getgrent()) != NULL) {
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if (grp->gr_gid == agroup)
continue;
for (i = 0; grp->gr_mem[i]; i++) {
if (!strcmp(grp->gr_mem[i], uname)) {
for (i = 0; i < MIN(ngroups, maxgroups); i++) {
if (grp->gr_gid == groups[i])
goto nextgroup;
}
if (ngroups < maxgroups)
groups[ngroups] = grp->gr_gid;
else
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ret = -1;
ngroups++;
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break;
}
}
}
endgrent();
*grpcnt = ngroups;
return (ret);
}