1/*-
2 * Copyright (c) 2001 FreeBSD Inc.
3 * All rights reserved.
4 *
5 * These routines are for converting time_t to fixed-bit representations
6 * for use in protocols or storage.  When converting time to a larger
7 * representation of time_t these routines are expected to assume temporal
8 * locality and use the 50-year rule to properly set the msb bits.  XXX
9 *
10 * Redistribution and use under the terms of the COPYRIGHT file at the
11 * base of the source tree.
12 */
13
14#include <sys/types.h>
15#include <timeconv.h>
16
17/*
18 * Convert a 32 bit representation of time_t into time_t.  XXX needs to
19 * implement the 50-year rule to handle post-2038 conversions.
20 */
21time_t
22_time32_to_time(__int32_t t32)
23{
24    return((time_t)t32);
25}
26
27/*
28 * Convert time_t to a 32 bit representation.  If time_t is 64 bits we can
29 * simply chop it down.   The resulting 32 bit representation can be
30 * converted back to a temporally local 64 bit time_t using time32_to_time.
31 */
32__int32_t
33_time_to_time32(time_t t)
34{
35    return((__int32_t)t);
36}
37
38/*
39 * Convert a 64 bit representation of time_t into time_t.  If time_t is
40 * represented as 32 bits we can simply chop it and not support times
41 * past 2038.
42 */
43time_t
44_time64_to_time(__int64_t t64)
45{
46    return((time_t)t64);
47}
48
49/*
50 * Convert time_t to a 64 bit representation.  If time_t is represented
51 * as 32 bits we simply sign-extend and do not support times past 2038.
52 */
53__int64_t
54_time_to_time64(time_t t)
55{
56    return((__int64_t)t);
57}
58
59/*
60 * Convert to/from 'long'.  Depending on the sizeof(long) this may or
61 * may not require using the 50-year rule.
62 */
63long
64_time_to_long(time_t t)
65{
66    if (sizeof(long) == sizeof(__int64_t))
67	return(_time_to_time64(t));
68    return((long)t);
69}
70
71time_t
72_long_to_time(long tlong)
73{
74    if (sizeof(long) == sizeof(__int32_t))
75	return(_time32_to_time(tlong));
76    return((time_t)tlong);
77}
78
79/*
80 * Convert to/from 'int'.  Depending on the sizeof(int) this may or
81 * may not require using the 50-year rule.
82 */
83int
84_time_to_int(time_t t)
85{
86    if (sizeof(int) == sizeof(__int64_t))
87	return(_time_to_time64(t));
88    return((int)t);
89}
90
91time_t
92_int_to_time(int tint)
93{
94    if (sizeof(int) == sizeof(__int32_t))
95	return(_time32_to_time(tint));
96    return((time_t)tint);
97}
98