1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include "../common/compat.h"
30#include <stdio.h>
31#include <sys/types.h>
32#include <unistd.h>
33#include <sys/syscall.h>
34
35/*
36 * If reading from the utmp file, map the data to the SunOS 4.1
37 * format on the fly.
38 */
39
40extern void to_utmp(char *, char *, int);
41
42int
43read(int fd, char *buf, int size)
44{
45	return (bc_read(fd, buf, size));
46}
47
48int
49bc_read(int fd, char *buf, int size)
50{
51	int ret, off;
52	char *nbuf;
53
54	if (fd_get(fd) != -1) { /* we're reading utmp (utmpx, really) */
55		size = getmodsize(size, sizeof (struct compat_utmp),
56		    sizeof (struct utmpx));
57
58		if ((nbuf = (void *)malloc(size)) == NULL) {
59			(void) fprintf(stderr, "read: malloc failed\n");
60			exit(-1);
61		}
62
63		if ((ret = _read(fd, nbuf, size)) == -1) {
64			free(nbuf);
65			return (-1);
66		}
67
68		to_utmp(buf, nbuf, ret);
69
70		ret = getmodsize(ret, sizeof (struct utmpx),
71		    sizeof (struct compat_utmp));
72		free(nbuf);
73		return (ret);
74	}
75
76	return (_read(fd, buf, size));
77}
78
79void
80to_utmp(char *buf, char *nbuf, int len)
81{
82	struct compat_utmp *ut;
83	struct utmpx *utx;
84
85	utx = (struct utmpx *)nbuf;
86	ut  = (struct compat_utmp *)buf;
87
88	while ((char *)utx < (nbuf + len)) {
89		(void) strncpy(ut->ut_line, utx->ut_line, sizeof (ut->ut_line));
90		(void) strncpy(ut->ut_name, utx->ut_user, sizeof (ut->ut_name));
91		(void) strncpy(ut->ut_host, utx->ut_host, sizeof (ut->ut_host));
92		ut->ut_time = utx->ut_tv.tv_sec;
93		utx++;
94		ut++;
95	}
96}
97