1 /* $NetBSD: cdf_time.c,v 1.7 2015/01/02 21:15:32 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2008 Christos Zoulas
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "file.h"
30
31 #ifndef lint
32 #if 0
33 FILE_RCSID("@(#)$File: cdf_time.c,v 1.15 2014/05/14 23:15:42 christos Exp $")
34 #else
35 __RCSID("$NetBSD: cdf_time.c,v 1.7 2015/01/02 21:15:32 christos Exp $");
36 #endif
37 #endif
38
39 #include <time.h>
40 #ifdef TEST
41 #include <err.h>
42 #endif
43 #include <string.h>
44
45 #include "cdf.h"
46
47 #define isleap(y) ((((y) % 4) == 0) && \
48 ((((y) % 100) != 0) || (((y) % 400) == 0)))
49
50 static const int mdays[] = {
51 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
52 };
53
54 /*
55 * Return the number of days between jan 01 1601 and jan 01 of year.
56 */
57 static int
cdf_getdays(int year)58 cdf_getdays(int year)
59 {
60 int days = 0;
61 int y;
62
63 for (y = CDF_BASE_YEAR; y < year; y++)
64 days += isleap(y) + 365;
65
66 return days;
67 }
68
69 /*
70 * Return the day within the month
71 */
72 static int
cdf_getday(int year,int days)73 cdf_getday(int year, int days)
74 {
75 size_t m;
76
77 for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
78 int sub = mdays[m] + (m == 1 && isleap(year));
79 if (days < sub)
80 return days;
81 days -= sub;
82 }
83 return days;
84 }
85
86 /*
87 * Return the 0...11 month number.
88 */
89 static int
cdf_getmonth(int year,int days)90 cdf_getmonth(int year, int days)
91 {
92 size_t m;
93
94 for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
95 days -= mdays[m];
96 if (m == 1 && isleap(year))
97 days--;
98 if (days <= 0)
99 return (int)m;
100 }
101 return (int)m;
102 }
103
104 int
cdf_timestamp_to_timespec(struct timespec * ts,cdf_timestamp_t t)105 cdf_timestamp_to_timespec(struct timespec *ts, cdf_timestamp_t t)
106 {
107 struct tm tm;
108 #ifdef HAVE_STRUCT_TM_TM_ZONE
109 static char UTC[] = "UTC";
110 #endif
111 int rdays;
112
113 /* Unit is 100's of nanoseconds */
114 ts->tv_nsec = (t % CDF_TIME_PREC) * 100;
115
116 t /= CDF_TIME_PREC;
117 tm.tm_sec = (int)(t % 60);
118 t /= 60;
119
120 tm.tm_min = (int)(t % 60);
121 t /= 60;
122
123 tm.tm_hour = (int)(t % 24);
124 t /= 24;
125
126 /* XXX: Approx */
127 tm.tm_year = (int)(CDF_BASE_YEAR + (t / 365));
128
129 rdays = cdf_getdays(tm.tm_year);
130 t -= rdays - 1;
131 tm.tm_mday = cdf_getday(tm.tm_year, (int)t);
132 tm.tm_mon = cdf_getmonth(tm.tm_year, (int)t);
133 tm.tm_wday = 0;
134 tm.tm_yday = 0;
135 tm.tm_isdst = 0;
136 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
137 tm.tm_gmtoff = 0;
138 #endif
139 #ifdef HAVE_STRUCT_TM_TM_ZONE
140 tm.tm_zone = UTC;
141 #endif
142 tm.tm_year -= 1900;
143 ts->tv_sec = mktime(&tm);
144 if (ts->tv_sec == -1) {
145 errno = EINVAL;
146 return -1;
147 }
148 return 0;
149 }
150
151 int
152 /*ARGSUSED*/
cdf_timespec_to_timestamp(cdf_timestamp_t * t,const struct timespec * ts)153 cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timespec *ts)
154 {
155 #ifndef __lint__
156 (void)&t;
157 (void)&ts;
158 #endif
159 #ifdef notyet
160 struct tm tm;
161 if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
162 errno = EINVAL;
163 return -1;
164 }
165 *t = (ts->ts_nsec / 100) * CDF_TIME_PREC;
166 *t = tm.tm_sec;
167 *t += tm.tm_min * 60;
168 *t += tm.tm_hour * 60 * 60;
169 *t += tm.tm_mday * 60 * 60 * 24;
170 #endif
171 return 0;
172 }
173
174 char *
cdf_ctime(const time_t * sec,char * buf)175 cdf_ctime(const time_t *sec, char *buf)
176 {
177 char *ptr = ctime_r(sec, buf);
178 if (ptr != NULL)
179 return buf;
180 (void)snprintf(buf, 26, "*Bad* 0x%16.16" INT64_T_FORMAT "x\n",
181 (long long)*sec);
182 return buf;
183 }
184
185
186 #ifdef TEST_TIME
187 int
main(int argc,char * argv[])188 main(int argc, char *argv[])
189 {
190 struct timespec ts;
191 char buf[25];
192 static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
193 static const char *ref = "Sat Apr 23 01:30:00 1977";
194 char *p, *q;
195
196 cdf_timestamp_to_timespec(&ts, tst);
197 p = cdf_ctime(&ts.tv_sec, buf);
198 if ((q = strchr(p, '\n')) != NULL)
199 *q = '\0';
200 if (strcmp(ref, p) != 0)
201 errx(1, "Error date %s != %s\n", ref, p);
202 return 0;
203 }
204 #endif
205