/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1987, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)vipw.c	8.3 (Berkeley) 04/02/94";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pw_util.h"

char *tempname;

void	copyfile __P((int, int));
void	usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int pfd, tfd;
	struct stat begin, end;
	int ch;

	while ((ch = getopt(argc, argv, "")) != EOF)
		switch (ch) {
		case '?':
		default:
			usage();
		}
	
	argc -= optind;
	argv += optind;

	if (argc != 0)
		usage();

	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) {
			warnx("no changes made");
			pw_error((char *)NULL, 0, 0);
		}
		if (pw_mkdb())
			break;
		pw_prompt();
	}
	exit(0);
}

void
copyfile(from, to)
	int from, to;
{
	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);
}

void
usage()
{

	(void)fprintf(stderr, "usage: vipw\n");
	exit(1);
}