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87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/* getugroups.c -- return a list of the groups a user is in
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Copyright (C) 1990, 1991 Free Software Foundation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Written by David MacKenzie. */
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#include <sys/types.h>
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#include <grp.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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/* Even though SunOS 4, Ultrix 4, and 386BSD are mostly POSIX.1 compliant,
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their getgroups system call (except in the `System V' environment, which
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is troublesome in other ways) fills in an array of int, not gid_t
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(which is `short' on those systems). We do the same, for consistency.
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Kludge, kludge. */
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#ifdef _POSIX_VERSION
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#if !defined(sun) && !defined(ultrix) && !defined(__386BSD__)
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#define GETGROUPS_T gid_t
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#else /* sun or ultrix or 386BSD */
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#define GETGROUPS_T int
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#endif /* sun or ultrix or 386BSD */
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#else /* not _POSIX_VERSION */
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#define GETGROUPS_T int
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#endif /* not _POSIX_VERSION */
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/* setgrent, getgrent, and endgrent are not specified by POSIX.1,
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so header files might not declare them.
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If you don't have them at all, we can't implement this function.
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You lose! */
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struct group *getgrent ();
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#if defined(USG) || defined(STDC_HEADERS)
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#include <string.h>
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#else
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#include <strings.h>
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#endif
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/* Like `getgroups', but for user USERNAME instead of for
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the current process. */
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int
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getugroups (maxcount, grouplist, username)
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int maxcount;
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GETGROUPS_T *grouplist;
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char *username;
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{
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struct group *grp;
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register char **cp;
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register int count = 0;
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setgrent ();
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while ((grp = getgrent ()) != 0)
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for (cp = grp->gr_mem; *cp; ++cp)
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if (!strcmp (username, *cp))
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{
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if (maxcount != 0)
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{
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if (count >= maxcount)
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{
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endgrent ();
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return count;
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}
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grouplist[count] = grp->gr_gid;
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}
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count++;
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}
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endgrent ();
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return count;
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}
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