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/*
* Copyright (C) 1995. Bill Brown <brown@gis.uiuc.edu> & Michael Shapiro
*
* This program is free software under the GPL (>=v2)
* Read the file GPL.TXT coming with GRASS for details.
*/
#include <grass/datetime.h>
static int have(int x, const DateTime *dt)
{
return datetime_is_between(x, dt->from, dt->to);
}
/*!
* \brief
*
* returns 0 on success
*
* \param dt
* \param minutes
* \return int
*/
int datetime_check_timezone(const DateTime *dt, int minutes)
{
if (!datetime_is_absolute(dt))
return datetime_error(-1, "datetime not absolute");
if (!have(DATETIME_MINUTE, dt))
return datetime_error(-2, "datetime has no minute");
if (!datetime_is_valid_timezone(minutes))
return datetime_error(-3, "invalid datetime timezone");
return 0;
}
/*!
* \brief
*
* returns 0 on success
*
* \param dt
* \param minutes
* \return int
*/
int datetime_get_timezone(const DateTime *dt, int *minutes)
{
int stat;
stat = datetime_check_timezone(dt, dt->tz);
if (stat == 0)
*minutes = dt->tz;
return stat;
}
/*!
* \brief
*
* returns 0 on success
*
* \param dt
* \param minutes
* \return int
*/
int datetime_set_timezone(DateTime *dt, int minutes)
{
int stat;
stat = datetime_check_timezone(dt, minutes);
if (stat == 0)
dt->tz = minutes;
return stat;
}
/*!
* \brief
*
* unsets timezone in 'dt'
* returns 0
*
* \param dt
* \return int
*/
int datetime_unset_timezone(DateTime *dt)
{
dt->tz = -9999;
return 0;
}
/*!
* \brief
*
* Returns:
* 1 OK: -720 <= minutes <= 780 (720 = 12 hours; 780 = 13 hours)
* 0 NOT OK
*
* \param minutes
* \return int
*/
int datetime_is_valid_timezone(int minutes)
{
return (minutes >= -720 && minutes <= 780);
}
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