1 /* 2 * Copyright (c) 1997 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "der_locl.h" 35 36 RCSID("$Id: timegm.c,v 1.7 1999/12/02 17:05:02 joda Exp $"); 37 38 #ifndef HAVE_TIMEGM 39 40 static int 41 is_leap(unsigned y) 42 { 43 y += 1900; 44 return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0); 45 } 46 47 time_t 48 timegm (struct tm *tm) 49 { 50 static const unsigned ndays[2][12] ={ 51 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, 52 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}}; 53 time_t res = 0; 54 unsigned i; 55 56 for (i = 70; i < tm->tm_year; ++i) 57 res += is_leap(i) ? 366 : 365; 58 59 for (i = 0; i < tm->tm_mon; ++i) 60 res += ndays[is_leap(tm->tm_year)][i]; 61 res += tm->tm_mday - 1; 62 res *= 24; 63 res += tm->tm_hour; 64 res *= 60; 65 res += tm->tm_min; 66 res *= 60; 67 res += tm->tm_sec; 68 return res; 69 } 70 71 #endif /* HAVE_TIMEGM */ 72