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 21366 2007-06-27 10:06:22Z lha $"); 37 38 static int 39 is_leap(unsigned y) 40 { 41 y += 1900; 42 return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0); 43 } 44 45 /* 46 * This is a simplifed version of timegm(3) that doesn't accept out of 47 * bound values that timegm(3) normally accepts but those are not 48 * valid in asn1 encodings. 49 */ 50 51 time_t 52 _der_timegm (struct tm *tm) 53 { 54 static const unsigned ndays[2][12] ={ 55 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, 56 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}}; 57 time_t res = 0; 58 unsigned i; 59 60 if (tm->tm_year < 0) 61 return -1; 62 if (tm->tm_mon < 0 || tm->tm_mon > 11) 63 return -1; 64 if (tm->tm_mday < 1 || tm->tm_mday > ndays[is_leap(tm->tm_year)][tm->tm_mon]) 65 return -1; 66 if (tm->tm_hour < 0 || tm->tm_hour > 23) 67 return -1; 68 if (tm->tm_min < 0 || tm->tm_min > 59) 69 return -1; 70 if (tm->tm_sec < 0 || tm->tm_sec > 59) 71 return -1; 72 73 for (i = 70; i < tm->tm_year; ++i) 74 res += is_leap(i) ? 366 : 365; 75 76 for (i = 0; i < tm->tm_mon; ++i) 77 res += ndays[is_leap(tm->tm_year)][i]; 78 res += tm->tm_mday - 1; 79 res *= 24; 80 res += tm->tm_hour; 81 res *= 60; 82 res += tm->tm_min; 83 res *= 60; 84 res += tm->tm_sec; 85 return res; 86 } 87