86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
/*
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* Copyright 1990 by the Massachusetts Institute of Technology.
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* For copying and distribution information, please see the file
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* <Copyright.MIT>.
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*
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* Convert a struct tm * to a UNIX time.
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*
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* from: maketime.c,v 4.2 90/01/09 15:54:51 raeburn Exp $
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* $Id: maketime.c,v 1.3 1995/07/18 16:37:29 mark Exp $
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*/
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#if 0
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#ifndef lint
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static char rcsid[] =
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"$Id: maketime.c,v 1.1 1994/03/21 16:23:54 piero Exp ";
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#endif lint
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#endif
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#include <sys/time.h>
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#define daysinyear(y) (((y) % 4) ? 365 : (((y) % 100) ? 366 : (((y) % 400) ? 365 : 366)))
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#define SECSPERDAY 24*60*60
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#define SECSPERHOUR 60*60
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#define SECSPERMIN 60
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static int cumdays[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334,
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365};
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static int leapyear[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static int nonleapyear[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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long
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maketime(tp, local)
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register struct tm *tp;
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int local;
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{
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register long retval;
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int foo;
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int *marray;
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if (tp->tm_mon < 0 || tp->tm_mon > 11 ||
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tp->tm_hour < 0 || tp->tm_hour > 23 ||
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tp->tm_min < 0 || tp->tm_min > 59 ||
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tp->tm_sec < 0 || tp->tm_sec > 59) /* out of range */
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return 0;
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retval = 0;
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if (tp->tm_year < 1900)
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foo = tp->tm_year + 1900;
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else
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foo = tp->tm_year;
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if (foo < 1901 || foo > 2038) /* year is too small/large */
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return 0;
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if (daysinyear(foo) == 366) {
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if (tp->tm_mon > 1)
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retval+= SECSPERDAY; /* add leap day */
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marray = leapyear;
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} else
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marray = nonleapyear;
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if (tp->tm_mday < 0 || tp->tm_mday > marray[tp->tm_mon])
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return 0; /* out of range */
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while (--foo >= 1970)
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retval += daysinyear(foo) * SECSPERDAY;
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retval += cumdays[tp->tm_mon] * SECSPERDAY;
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retval += (tp->tm_mday-1) * SECSPERDAY;
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retval += tp->tm_hour * SECSPERHOUR + tp->tm_min * SECSPERMIN + tp->tm_sec;
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if (local) {
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/* need to use local time, so we retrieve timezone info */
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struct timezone tz;
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struct timeval tv;
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if (gettimeofday(&tv, &tz) < 0) {
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/* some error--give up? */
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return(retval);
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}
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retval += tz.tz_minuteswest * SECSPERMIN;
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}
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return(retval);
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}
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