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- /*
- * Copyright (c) 1989 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.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)getgrent.c 5.9 (Berkeley) 4/1/91";
- #endif /* LIBC_SCCS and not lint */
-
- #include <sys/types.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <grp.h>
-
- static FILE *_gr_fp;
- static struct group _gr_group;
- static int _gr_stayopen;
- static int grscan(), start_gr();
-
- #define MAXGRP 200
- static char *members[MAXGRP];
- #define MAXLINELENGTH 1024
- static char line[MAXLINELENGTH];
-
- struct group *
- getgrent()
- {
- if (!_gr_fp && !start_gr() || !grscan(0, 0, NULL))
- return(NULL);
- return(&_gr_group);
- }
-
- struct group *
- getgrnam(name)
- const char *name;
- {
- int rval;
-
- if (!start_gr())
- return(NULL);
- rval = grscan(1, 0, name);
- if (!_gr_stayopen)
- endgrent();
- return(rval ? &_gr_group : NULL);
- }
-
- struct group *
- #ifdef __STDC__
- getgrgid(gid_t gid)
- #else
- getgrgid(gid)
- gid_t gid;
- #endif
- {
- int rval;
-
- if (!start_gr())
- return(NULL);
- rval = grscan(1, gid, NULL);
- if (!_gr_stayopen)
- endgrent();
- return(rval ? &_gr_group : NULL);
- }
-
- static
- start_gr()
- {
- if (_gr_fp) {
- rewind(_gr_fp);
- return(1);
- }
- return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
- }
-
- int
- setgrent()
- {
- return(setgroupent(0));
- }
-
- int
- setgroupent(stayopen)
- int stayopen;
- {
- if (!start_gr())
- return(0);
- _gr_stayopen = stayopen;
- return(1);
- }
-
- void
- endgrent()
- {
- if (_gr_fp) {
- (void)fclose(_gr_fp);
- _gr_fp = NULL;
- }
- }
-
- static
- grscan(search, gid, name)
- register int search, gid;
- register char *name;
- {
- register char *cp, **m;
- char *bp;
- char *fgets(), *strsep(), *index();
-
- for (;;) {
- if (!fgets(line, sizeof(line), _gr_fp))
- return(0);
- bp = line;
- /* skip lines that are too big */
- if (!index(line, '\n')) {
- int ch;
-
- while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
- ;
- continue;
- }
- _gr_group.gr_name = strsep(&bp, ":\n");
- if (search && name && strcmp(_gr_group.gr_name, name))
- continue;
- _gr_group.gr_passwd = strsep(&bp, ":\n");
- if (!(cp = strsep(&bp, ":\n")))
- continue;
- _gr_group.gr_gid = atoi(cp);
- if (search && name == NULL && _gr_group.gr_gid != gid)
- continue;
- for (m = _gr_group.gr_mem = members;; ++m) {
- if (m == &members[MAXGRP - 1]) {
- *m = NULL;
- break;
- }
- if ((*m = strsep(&bp, ", \n")) == NULL)
- break;
- }
- return(1);
- }
- /* NOTREACHED */
- }
-