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Member "leafnode-1.12.0/timegm.c" (30 Jan 2009, 2399 Bytes) of package /linux/misc/leafnode-1.12.0.tar.xz:


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