1 /* 2 * Copyright (c) 1997 Kungliga Tekniska Högskolan 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 /* 35 adapted for Samba4 by Andrew Tridgell 36 */ 37 38 #include "includes.h" 39 40 #include <time.h> 41 42 #ifndef HAVE_TIMEGM 43 44 static int is_leap(unsigned y) 45 { 46 y += 1900; 47 return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0); 48 } 49 50 time_t timegm(struct tm *tm) 51 { 52 static const unsigned ndays[2][12] ={ 53 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, 54 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}}; 55 time_t res = 0; 56 unsigned i; 57 58 if (tm->tm_mon > 12 || 59 tm->tm_mon < 0 || 60 tm->tm_mday > 31 || 61 tm->tm_min > 60 || 62 tm->tm_sec > 60 || 63 tm->tm_hour > 24) { 64 /* invalid tm structure */ 65 return 0; 66 } 67 68 for (i = 70; i < tm->tm_year; ++i) 69 res += is_leap(i) ? 366 : 365; 70 71 for (i = 0; i < tm->tm_mon; ++i) 72 res += ndays[is_leap(tm->tm_year)][i]; 73 res += tm->tm_mday - 1; 74 res *= 24; 75 res += tm->tm_hour; 76 res *= 60; 77 res += tm->tm_min; 78 res *= 60; 79 res += tm->tm_sec; 80 return res; 81 } 82 #endif /* HAVE_TIMEGM */ 83