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File: [cvs.NetBSD.org] / src / lib / libc / gen / getgrouplist.c (download)
Revision 1.17, Thu Aug 7 16:42:49 2003 UTC (20 years, 7 months ago) by agc
Move UCB-licensed code from 4-clause to 3-clause licence. Patches provided by Joel Baker in PR 22280, verified by myself. |
/* $NetBSD: getgrouplist.c,v 1.17 2003/08/07 16:42:49 agc Exp $ */ /* * 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. 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> #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)getgrouplist.c 8.2 (Berkeley) 12/8/94"; #else __RCSID("$NetBSD: getgrouplist.c,v 1.17 2003/08/07 16:42:49 agc Exp $"); #endif #endif /* LIBC_SCCS and not lint */ /* * get credential */ #include "namespace.h" #include <sys/param.h> #include <assert.h> #include <grp.h> #include <string.h> #include <unistd.h> #ifdef __weak_alias __weak_alias(getgrouplist,_getgrouplist) #endif /* * _getgrent_user() is a libc-private function defined in getgrent.c which * use because certain name service types such as Hesiod lookup grouplists * by username rather than just iterating over the list of groups. */ struct group *_getgrent_user(const char *); int getgrouplist(uname, agroup, groups, grpcnt) const char *uname; gid_t agroup; gid_t *groups; int *grpcnt; { struct group *grp; int i, ngroups; int ret, maxgroups; _DIAGASSERT(uname != NULL); _DIAGASSERT(groups != NULL); _DIAGASSERT(grpcnt != NULL); ret = 0; ngroups = 0; maxgroups = *grpcnt; /* * install primary group */ if (ngroups < maxgroups) groups[ngroups] = agroup; else ret = -1; ngroups++; /* * Scan the group file to find additional groups. */ setgrent(); nextgroup: while ((grp = _getgrent_user(uname)) != NULL) { if (grp->gr_gid == agroup) continue; 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 ret = -1; ngroups++; } endgrent(); *grpcnt = ngroups; return (ret); }