1 /* $NetBSD: cdf_time.c,v 1.5 2013/01/03 23:05:38 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 1.12 2012/05/15 17:14:36 christos Exp $") 34 #else 35 __RCSID("$NetBSD: cdf_time.c,v 1.5 2013/01/03 23:05:38 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 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 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 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 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*/ 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 * 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%16.16llx\n", (long long)*sec); 181 return buf; 182 } 183 184 185 #ifdef TEST 186 int 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