incr3.c

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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>

int
datetime_get_increment_type(const DateTime * dt, int *mode, int *from,
                            int *to, int *fracsec)
{
    if (!datetime_is_valid_type(dt))
        return datetime_error_code();

    *mode = DATETIME_RELATIVE;
    *to = dt->to;
    *fracsec = dt->fracsec;

    if (datetime_is_absolute(dt)) {
        if (datetime_in_interval_year_month(dt->to))
            *from = DATETIME_YEAR;
        else
            *from = DATETIME_DAY;
    }
    else {
        *from = dt->from;
    }
    return 0;
}


int datetime_set_increment_type(const DateTime * src, DateTime * incr)
{
    int mode, from, to, fracsec;

    if (datetime_get_increment_type(src, &mode, &from, &to, &fracsec) != 0)
        return datetime_error_code();
    return datetime_set_type(incr, mode, from, to, fracsec);
}