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/* $Id: gettime.c 4135 2000-10-19 16:38:13Z kondou $
**
** Find and return time information portably.
*/
#include "config.h"
#include "libinn.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
int
GetTimeInfo(TIMEINFO *Now)
{
static time_t NextHour;
static long LastTzone;
struct tm *tm;
int secondsUntilNextHour;
struct timeval tv;
#ifndef HAVE_TM_GMTOFF
struct tm local;
struct tm gmt;
#endif
/* Get the basic time. */
if (gettimeofday(&tv, (struct timezone *) 0) == -1)
return -1;
Now->time = tv.tv_sec;
Now->usec = tv.tv_usec;
/* Now get the timezone if the last time < HH:00:00 <= now for some HH. */
if (NextHour <= Now->time) {
tm = localtime(&Now->time);
if (tm == NULL)
return -1;
secondsUntilNextHour = 60 * (60 - tm->tm_min) - tm->tm_sec;
#ifdef HAVE_TM_GMTOFF
LastTzone = (0 - tm->tm_gmtoff) / 60;
#else
/* To get the timezone, compare localtime with GMT. */
local = *tm;
if ((tm = gmtime(&Now->time)) == NULL)
return -1;
gmt = *tm;
/* Assume we are never more than 24 hours away. */
LastTzone = gmt.tm_yday - local.tm_yday;
if (LastTzone > 1)
LastTzone = -24;
else if (LastTzone < -1)
LastTzone = 24;
else
LastTzone *= 24;
/* Scale in the hours and minutes; ignore seconds. */
LastTzone += gmt.tm_hour - local.tm_hour;
LastTzone *= 60;
LastTzone += gmt.tm_min - local.tm_min;
#endif /* defined(HAVE_TM_GMTOFF) */
NextHour = Now->time + secondsUntilNextHour;
}
Now->tzone = LastTzone;
return 0;
}
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