1 /* 2 * Copyright (c) 1997, 2006 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 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: timegm.c 18606 2006-10-19 16:19:10Z lha $"); 37 #endif 38 39 #include "roken.h" 40 41 static int 42 is_leap(unsigned y) 43 { 44 y += 1900; 45 return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0); 46 } 47 48 /* 49 * XXX This is a simplifed version of timegm, it needs to support out of 50 * bounds values. 51 */ 52 53 time_t 54 rk_timegm (struct tm *tm) 55 { 56 static const unsigned ndays[2][12] ={ 57 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, 58 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}}; 59 time_t res = 0; 60 unsigned i; 61 62 if (tm->tm_year < 0) 63 return -1; 64 if (tm->tm_mon < 0 || tm->tm_mon > 11) 65 return -1; 66 if (tm->tm_mday < 1 || tm->tm_mday > ndays[is_leap(tm->tm_year)][tm->tm_mon]) 67 return -1; 68 if (tm->tm_hour < 0 || tm->tm_hour > 23) 69 return -1; 70 if (tm->tm_min < 0 || tm->tm_min > 59) 71 return -1; 72 if (tm->tm_sec < 0 || tm->tm_sec > 59) 73 return -1; 74 75 for (i = 70; i < tm->tm_year; ++i) 76 res += is_leap(i) ? 366 : 365; 77 78 for (i = 0; i < tm->tm_mon; ++i) 79 res += ndays[is_leap(tm->tm_year)][i]; 80 res += tm->tm_mday - 1; 81 res *= 24; 82 res += tm->tm_hour; 83 res *= 60; 84 res += tm->tm_min; 85 res *= 60; 86 res += tm->tm_sec; 87 return res; 88 } 89