source: vendor/current/testsuite/nsswitch/getent_pwent.c

/* Test out of order operations with {set,get,end}pwent */

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Security context tests
   Copyright (C) Tim Potter 2000
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <pwd.h>

int main (int argc, char **argv)
{
        struct passwd *pw;
        int found = 0;
        int num_users, i;

        /* Test getpwent() without setpwent() */

        for (i = 0; i < 100; i++) {
                pw = getpwent();

                /* This is supposed to work */

#if 0
                if (pw != NULL) {
                        printf("FAIL: getpwent() with no setpwent()\n");
                        return 1;
                }
#endif
        }

        /* Work out how many user till first domain user */

        num_users = 0;
        setpwent();

        while (1) {
                pw = getpwent();
                num_users++;

                if (pw == NULL) break;

                if (strchr(pw->pw_name, '/')) {
                        found = 1;
                        break;
                }

        }

        if (!found) {
                printf("FAIL: could not find any domain users\n");
                return 1;
        }

        /* Test stopping getpwent in the middle of a set of users */

        endpwent();

        /* Test setpwent() without any getpwent() calls */

        setpwent();

        for (i = 0; i < (num_users - 1); i++) {
                getpwent();
        }

        endpwent();

        /* Test lots of setpwent() calls */
        
        setpwent();

        for (i = 0; i < (num_users - 1); i++) {
                getpwent();
        }

        for (i = 0; i < 100; i++) {
                setpwent();
        }

        /* Test lots of endpwent() calls */

        setpwent();

        for (i = 0; i < (num_users - 1); i++) {
                getpwent();
        }

        for (i = 0; i < 100; i++) {
                endpwent();
        }

        /* Everything's cool */

        printf("PASS\n");
        return 0;
}