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
30 FILE_RCSID("@(#)$File: cdf_time.c,v 1.20 2021/12/06 15:33:00 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
44 static 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 */
51 static int
cdf_getdays(int year)52 cdf_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 */
66 static int
cdf_getday(int year,int days)67 cdf_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 */
83 static int
cdf_getmonth(int year,int days)84 cdf_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
98 int
cdf_timestamp_to_timespec(struct timespec * ts,cdf_timestamp_t t)99 cdf_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
145 int
146 /*ARGSUSED*/
cdf_timespec_to_timestamp(cdf_timestamp_t * t,const struct timespec * ts)147 cdf_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
168 char *
cdf_ctime(const time_t * sec,char * buf)169 cdf_ctime(const time_t *sec, char *buf)
170 {
171 char *ptr = ctime_r(sec, buf);
172 if (ptr != NULL)
173 return buf;
174 #ifdef WIN32
175 (void)snprintf(buf, 26, "*Bad* 0x%16.16I64x\n",
176 CAST(long long, *sec));
177 #else
178 (void)snprintf(buf, 26, "*Bad* %#16.16" INT64_T_FORMAT "x\n",
179 CAST(long long, *sec));
180 #endif
181 return buf;
182 }
183
184
185 #ifdef TEST_TIME
186 int
main(int argc,char * argv[])187 main(int argc, char *argv[])
188 {
189 struct timespec ts;
190 char buf[25];
191 static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
192 static const char *ref = "Sat Apr 23 01:30:00 1977";
193 char *p, *q;
194
195 cdf_timestamp_to_timespec(&ts, tst);
196 p = cdf_ctime(&ts.tv_sec, buf);
197 if ((q = strchr(p, '\n')) != NULL)
198 *q = '\0';
199 if (strcmp(ref, p) != 0)
200 errx(1, "Error date %s != %s\n", ref, p);
201 return 0;
202 }
203 #endif
204