[9] | 1 | /* glpenv06.c (standard time) */ |
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| 2 | |
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| 3 | /*********************************************************************** |
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| 4 | * This code is part of GLPK (GNU Linear Programming Kit). |
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| 5 | * |
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| 6 | * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
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| 7 | * 2009, 2010, 2011 Andrew Makhorin, Department for Applied Informatics, |
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| 8 | * Moscow Aviation Institute, Moscow, Russia. All rights reserved. |
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| 9 | * E-mail: <mao@gnu.org>. |
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| 10 | * |
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| 11 | * GLPK is free software: you can redistribute it and/or modify it |
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| 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation, either version 3 of the License, or |
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| 14 | * (at your option) any later version. |
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| 15 | * |
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| 16 | * GLPK is distributed in the hope that it will be useful, but WITHOUT |
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| 17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 18 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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| 19 | * License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with GLPK. If not, see <http://www.gnu.org/licenses/>. |
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| 23 | ***********************************************************************/ |
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| 24 | |
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| 25 | #ifdef HAVE_CONFIG_H |
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| 26 | #include <config.h> |
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| 27 | #endif |
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| 28 | |
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| 29 | #include "glpapi.h" |
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| 30 | |
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| 31 | /*********************************************************************** |
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| 32 | * NAME |
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| 33 | * |
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| 34 | * glp_time - determine current universal time |
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| 35 | * |
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| 36 | * SYNOPSIS |
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| 37 | * |
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| 38 | * glp_long glp_time(void); |
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| 39 | * |
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| 40 | * RETURNS |
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| 41 | * |
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| 42 | * The routine glp_time returns the current universal time (UTC), in |
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| 43 | * milliseconds, elapsed since 00:00:00 GMT January 1, 1970. */ |
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| 44 | |
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| 45 | static const int epoch = 2440588; /* = jday(1, 1, 1970) */ |
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| 46 | |
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| 47 | /* POSIX version ******************************************************/ |
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| 48 | |
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| 49 | #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY) |
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| 50 | |
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| 51 | #include <sys/time.h> |
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| 52 | #include <time.h> |
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| 53 | |
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| 54 | glp_long glp_time(void) |
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| 55 | { struct timeval tv; |
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| 56 | struct tm *tm; |
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| 57 | glp_long t; |
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| 58 | int j; |
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| 59 | gettimeofday(&tv, NULL); |
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| 60 | tm = gmtime(&tv.tv_sec); |
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| 61 | j = jday(tm->tm_mday, tm->tm_mon + 1, 1900 + tm->tm_year); |
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| 62 | xassert(j >= 0); |
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| 63 | t = xlset(j - epoch); |
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| 64 | t = xlmul(t, xlset(24)); |
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| 65 | t = xladd(t, xlset(tm->tm_hour)); |
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| 66 | t = xlmul(t, xlset(60)); |
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| 67 | t = xladd(t, xlset(tm->tm_min)); |
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| 68 | t = xlmul(t, xlset(60)); |
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| 69 | t = xladd(t, xlset(tm->tm_sec)); |
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| 70 | t = xlmul(t, xlset(1000)); |
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| 71 | t = xladd(t, xlset(tv.tv_usec / 1000)); |
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| 72 | return t; |
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| 73 | } |
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| 74 | |
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| 75 | /* Windows version ****************************************************/ |
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| 76 | |
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| 77 | #elif defined(__WOE__) |
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| 78 | |
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| 79 | #include <windows.h> |
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| 80 | |
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| 81 | glp_long glp_time(void) |
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| 82 | { SYSTEMTIME st; |
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| 83 | glp_long t; |
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| 84 | int j; |
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| 85 | GetSystemTime(&st); |
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| 86 | j = jday(st.wDay, st.wMonth, st.wYear); |
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| 87 | xassert(j >= 0); |
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| 88 | t = xlset(j - epoch); |
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| 89 | t = xlmul(t, xlset(24)); |
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| 90 | t = xladd(t, xlset(st.wHour)); |
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| 91 | t = xlmul(t, xlset(60)); |
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| 92 | t = xladd(t, xlset(st.wMinute)); |
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| 93 | t = xlmul(t, xlset(60)); |
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| 94 | t = xladd(t, xlset(st.wSecond)); |
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| 95 | t = xlmul(t, xlset(1000)); |
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| 96 | t = xladd(t, xlset(st.wMilliseconds)); |
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| 97 | return t; |
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| 98 | } |
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| 99 | |
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| 100 | /* portable ISO C version *********************************************/ |
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| 101 | |
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| 102 | #else |
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| 103 | |
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| 104 | #include <time.h> |
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| 105 | |
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| 106 | glp_long glp_time(void) |
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| 107 | { time_t timer; |
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| 108 | struct tm *tm; |
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| 109 | glp_long t; |
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| 110 | int j; |
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| 111 | timer = time(NULL); |
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| 112 | tm = gmtime(&timer); |
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| 113 | j = jday(tm->tm_mday, tm->tm_mon + 1, 1900 + tm->tm_year); |
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| 114 | xassert(j >= 0); |
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| 115 | t = xlset(j - epoch); |
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| 116 | t = xlmul(t, xlset(24)); |
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| 117 | t = xladd(t, xlset(tm->tm_hour)); |
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| 118 | t = xlmul(t, xlset(60)); |
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| 119 | t = xladd(t, xlset(tm->tm_min)); |
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| 120 | t = xlmul(t, xlset(60)); |
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| 121 | t = xladd(t, xlset(tm->tm_sec)); |
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| 122 | t = xlmul(t, xlset(1000)); |
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| 123 | return t; |
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| 124 | } |
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| 125 | |
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| 126 | #endif |
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| 127 | |
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| 128 | /*********************************************************************** |
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| 129 | * NAME |
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| 130 | * |
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| 131 | * glp_difftime - compute difference between two time values |
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| 132 | * |
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| 133 | * SYNOPSIS |
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| 134 | * |
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| 135 | * double glp_difftime(glp_long t1, glp_long t0); |
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| 136 | * |
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| 137 | * RETURNS |
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| 138 | * |
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| 139 | * The routine glp_difftime returns the difference between two time |
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| 140 | * values t1 and t0, expressed in seconds. */ |
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| 141 | |
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| 142 | double glp_difftime(glp_long t1, glp_long t0) |
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| 143 | { return |
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| 144 | xltod(xlsub(t1, t0)) / 1000.0; |
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| 145 | } |
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| 146 | |
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| 147 | /**********************************************************************/ |
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| 148 | |
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| 149 | #if 0 |
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| 150 | int main(void) |
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| 151 | { glp_long t; |
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| 152 | glp_ldiv d; |
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| 153 | int ttt, ss, mm, hh, day, month, year; |
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| 154 | char s[50]; |
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| 155 | t = glp_time(); |
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| 156 | xprintf("t = %s\n", xltoa(t, s)); |
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| 157 | d = xldiv(t, xlset(1000)); |
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| 158 | ttt = d.rem.lo, t = d.quot; |
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| 159 | d = xldiv(t, xlset(60)); |
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| 160 | ss = d.rem.lo, t = d.quot; |
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| 161 | d = xldiv(t, xlset(60)); |
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| 162 | mm = d.rem.lo, t = d.quot; |
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| 163 | d = xldiv(t, xlset(24)); |
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| 164 | hh = d.rem.lo, t = d.quot; |
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| 165 | xassert(jdate(t.lo + epoch, &day, &month, &year) == 0); |
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| 166 | xprintf("%04d-%02d-%02d %02d:%02d:%02d.%03d\n", year, month, day, |
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| 167 | hh, mm, ss, ttt); |
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| 168 | return 0; |
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| 169 | } |
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| 170 | #endif |
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| 171 | |
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| 172 | /* eof */ |
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