usr/src/usr.sbin/vipw/vipw.c

/*
 * Copyright (c) 1987 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)vipw.c      5.16 (Berkeley) 3/3/91";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *progname = "vipw";
char *tempname;

main()
{
        register int pfd, tfd;
        struct stat begin, end;

        pw_init();
        pfd = pw_lock();
        tfd = pw_tmp();
        copyfile(pfd, tfd);
        (void)close(tfd);

        for (;;) {
                if (stat(tempname, &begin))
                        pw_error(tempname, 1, 1);
                pw_edit(0);
                if (stat(tempname, &end))
                        pw_error(tempname, 1, 1);
                if (begin.st_mtime == end.st_mtime) {
                        (void)fprintf(stderr, "vipw: no changes made\n");
                        pw_error((char *)NULL, 0, 0);
                }
                if (pw_mkdb())
                        break;
                pw_prompt();
        }
        exit(0);
}

copyfile(from, to)
        register int from, to;
{
        register int nr, nw, off;
        char buf[8*1024];

        while ((nr = read(from, buf, sizeof(buf))) > 0)
                for (off = 0; off < nr; nr -= nw, off += nw)
                        if ((nw = write(to, buf + off, nr)) < 0)
                                pw_error(tempname, 1, 1);
        if (nr < 0)
                pw_error(_PATH_MASTERPASSWD, 1, 1);
}