1/*-
2 * Copyright (c) 2008 Christos Zoulas
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
15 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
16 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "file.h"
28
29#ifndef lint
30FILE_RCSID("@(#)$File: cdf_time.c,v 1.19 2019/03/12 20:43:05 christos Exp $")
31#endif
32
33#include <time.h>
34#ifdef TEST
35#include <err.h>
36#endif
37#include <string.h>
38
39#include "cdf.h"
40
41#define isleap(y) ((((y) % 4) == 0) && \
42    ((((y) % 100) != 0) || (((y) % 400) == 0)))
43
44static const int mdays[] = {
45    31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
46};
47
48/*
49 * Return the number of days between jan 01 1601 and jan 01 of year.
50 */
51static int
52cdf_getdays(int year)
53{
54	int days = 0;
55	int y;
56
57	for (y = CDF_BASE_YEAR; y < year; y++)
58		days += isleap(y) + 365;
59
60	return days;
61}
62
63/*
64 * Return the day within the month
65 */
66static int
67cdf_getday(int year, int days)
68{
69	size_t m;
70
71	for (m = 0; m < __arraycount(mdays); m++) {
72		int sub = mdays[m] + (m == 1 && isleap(year));
73		if (days < sub)
74			return days;
75		days -= sub;
76	}
77	return days;
78}
79
80/*
81 * Return the 0...11 month number.
82 */
83static int
84cdf_getmonth(int year, int days)
85{
86	size_t m;
87
88	for (m = 0; m < __arraycount(mdays); m++) {
89		days -= mdays[m];
90		if (m == 1 && isleap(year))
91			days--;
92		if (days <= 0)
93			return CAST(int, m);
94	}
95	return CAST(int, m);
96}
97
98int
99cdf_timestamp_to_timespec(struct timespec *ts, cdf_timestamp_t t)
100{
101	struct tm tm;
102#ifdef HAVE_STRUCT_TM_TM_ZONE
103	static char UTC[] = "UTC";
104#endif
105	int rdays;
106
107	/* Unit is 100's of nanoseconds */
108	ts->tv_nsec = (t % CDF_TIME_PREC) * 100;
109
110	t /= CDF_TIME_PREC;
111	tm.tm_sec = CAST(int, t % 60);
112	t /= 60;
113
114	tm.tm_min = CAST(int, t % 60);
115	t /= 60;
116
117	tm.tm_hour = CAST(int, t % 24);
118	t /= 24;
119
120	/* XXX: Approx */
121	tm.tm_year = CAST(int, CDF_BASE_YEAR + (t / 365));
122
123	rdays = cdf_getdays(tm.tm_year);
124	t -= rdays - 1;
125	tm.tm_mday = cdf_getday(tm.tm_year, CAST(int, t));
126	tm.tm_mon = cdf_getmonth(tm.tm_year, CAST(int, t));
127	tm.tm_wday = 0;
128	tm.tm_yday = 0;
129	tm.tm_isdst = 0;
130#ifdef HAVE_STRUCT_TM_TM_GMTOFF
131	tm.tm_gmtoff = 0;
132#endif
133#ifdef HAVE_STRUCT_TM_TM_ZONE
134	tm.tm_zone = UTC;
135#endif
136	tm.tm_year -= 1900;
137	ts->tv_sec = mktime(&tm);
138	if (ts->tv_sec == -1) {
139		errno = EINVAL;
140		return -1;
141	}
142	return 0;
143}
144
145int
146/*ARGSUSED*/
147cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timespec *ts)
148{
149#ifndef __lint__
150	(void)&t;
151	(void)&ts;
152#endif
153#ifdef notyet
154	struct tm tm;
155	if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
156		errno = EINVAL;
157		return -1;
158	}
159	*t = (ts->ts_nsec / 100) * CDF_TIME_PREC;
160	*t = tm.tm_sec;
161	*t += tm.tm_min * 60;
162	*t += tm.tm_hour * 60 * 60;
163	*t += tm.tm_mday * 60 * 60 * 24;
164#endif
165	return 0;
166}
167
168char *
169cdf_ctime(const time_t *sec, char *buf)
170{
171	char *ptr = ctime_r(sec, buf);
172	if (ptr != NULL)
173		return buf;
174	(void)snprintf(buf, 26, "*Bad* %#16.16" INT64_T_FORMAT "x\n",
175	    CAST(long long, *sec));
176	return buf;
177}
178
179
180#ifdef TEST_TIME
181int
182main(int argc, char *argv[])
183{
184	struct timespec ts;
185	char buf[25];
186	static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
187	static const char *ref = "Sat Apr 23 01:30:00 1977";
188	char *p, *q;
189
190	cdf_timestamp_to_timespec(&ts, tst);
191	p = cdf_ctime(&ts.tv_sec, buf);
192	if ((q = strchr(p, '\n')) != NULL)
193		*q = '\0';
194	if (strcmp(ref, p) != 0)
195		errx(1, "Error date %s != %s\n", ref, p);
196	return 0;
197}
198#endif
199