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make_dmy.c
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make_dmy.c
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#include <stdio.h>
#include <stdlib.h>
#include <vicNl.h>
#ifndef _LEAPYR
#define LEAPYR(y) (!((y)%400) || (!((y)%4) && ((y)%100)))
#endif
static char vcid[] = "$Id: make_dmy.c,v 4.4.2.1 2007/05/04 21:30:46 vicadmin Exp $";
dmy_struct *make_dmy(global_param_struct *global)
/**********************************************************************
make_dmy Dag Lohmann January 1996
This subroutine creates an array of structures that contain
information about the day, month and year of each time step.
modifications:
7-25-96 Added hour count, so that model can run on less than
a daily time step. KAC
5-17-99 Modified routine to use LEAPYR function, make use of
simulation ending dates, and to skip over initial
forcing data records so that the model can be run on
subsets of more complete data records. KAC
8-19-99 Modified routine to estimate the number of records
that should be skipped before starting to write
model output, based on the number of years defined
with the SKIPYEAR global variable. KAC
3-14-00 Fixed problem with accounting for number of days in
February. If last simulation year was a leap year,
number of days in February was not reset to 28 after
working out number of records and before working out
the number of forcing file records to skip. KAC
2006-02-07 Changed indexing of line 63 (if(endday...) by 1 GCT
**********************************************************************/
{
extern param_set_struct param_set;
dmy_struct *temp;
int hr, year, day, month, jday, ii, daymax;
int days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
int endmonth, endday, endyear, skiprec, i, offset;
int tmpmonth, tmpday, tmpyear, tmphr, tmpjday, step;
char DONE;
char ErrStr[MAXSTRING];
hr = global->starthour;
year = global->startyear;
day = global->startday;
month = global->startmonth;
/** Check if user defined end date instead of number of records **/
if(global->nrecs < 0) {
if((global->endyear < 0) || (global->endmonth < 0)
|| (global->endday < 0)) {
nrerror("The model global file MUST define EITHER the number of records to simulate (NRECS), or the year (ENDYEAR), month (ENDMONTH), and day (ENDDAY) of the last full simulation day");
}
endday = global->endday;
endmonth = global->endmonth;
endyear = global->endyear;
if(LEAPYR(endyear)) days[1] = 29;
else days[1] = 28;
if(endday < days[global->endmonth-1]) endday++;
else {
endday = 1;
endmonth++;
if(endmonth > 12) {
endmonth = 1;
endyear++;
}
}
DONE = FALSE;
ii = 0;
tmpyear = year;
tmpmonth = month;
tmpday = day;
tmphr = hr;
while(!DONE) {
get_next_time_step(&tmpyear,&tmpmonth,&tmpday,&tmphr,
&tmpjday,global->dt);
ii++;
if(tmpyear == endyear)
if(tmpmonth == endmonth)
if(tmpday == endday)
DONE = TRUE;
}
global->nrecs = ii;
}
else {
offset = 0;
tmphr = hr;
while (tmphr != 0) {
tmphr += global->dt;
offset++;
if(tmphr >= 24) tmphr = 0;
}
if( ((global->dt * (global->nrecs - offset)) % 24) != 0 ) {
sprintf(ErrStr,"Nrecs must be defined such that the model ends after completing a full day. Currently Nrecs is set to %i, while %i and %i are allowable values.", global->nrecs, ((global->dt * (global->nrecs - offset)) / 24) * 24, ((global->dt * (global->nrecs - offset)) / 24) * 24 + 24);
nrerror(ErrStr);
}
}
// allocate dmy struct
temp = (dmy_struct*) calloc(global->nrecs, sizeof(dmy_struct));
/** Create Date Structure for each Modeled Time Step **/
jday = day;
if( LEAPYR(year) ) days[1] = 29;
else days[1] = 28;
for ( ii = 0; ii < month-1; ii++ )
jday += days[ii];
DONE = FALSE;
ii = 0;
while(!DONE) {
temp[ii].hour = hr;
temp[ii].day = day;
temp[ii].month = month;
temp[ii].year = year;
temp[ii].day_in_year = jday;
get_next_time_step(&year,&month,&day,&hr,&jday,global->dt);
ii++;
if(ii == global->nrecs) DONE=TRUE;
}
/** Determine number of forcing records to skip before model start time **/
for ( i = 0; i < 2; i++ ) {
if(param_set.FORCE_DT[i] != MISSING) {
if(global->forceyear[i] > 0) {
tmpyear = global->forceyear[i];
tmpmonth = global->forcemonth[i];
tmpday = global->forceday[i];
tmphr = global->forcehour[i];
tmpjday = tmpday;
if ( LEAPYR(tmpyear) ) days[1] = 29;
else days[1] = 28;
for ( ii = 0; ii < tmpmonth-1; ii++)
tmpjday += days[ii];
step = (int)(1./((float)global->dt/24.));
while(tmpyear < temp[0].year ||
(tmpyear == temp[0].year && tmpjday < temp[0].day_in_year)) {
get_next_time_step(&tmpyear,&tmpmonth,&tmpday,&tmphr,
&tmpjday,global->dt);
global->forceskip[i] ++;
}
}
}
}
/** Determine the number of records to skip before starting output files **/
skiprec = 0;
for ( i = 0; i < global->skipyear; i++ ) {
if(LEAPYR(temp[skiprec].year)) skiprec += 366 * 24 / global->dt;
else skiprec += 365 * 24 / global->dt;
}
global->skipyear = skiprec;
return temp;
}
void get_next_time_step(int *year,
int *month,
int *day,
int *hr,
int *jday,
int dt) {
int days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
int daymax;
*hr += dt;
if(*hr >= 24) {
*hr=0;
*day += 1;
*jday += 1;
if(LEAPYR(*year)) days[1] = 29;
else days[1] = 28;
if(*day > days[*month-1]) {
*day = 1;
*month += 1;
if(*month == 13){
*month = 1;
*jday = 1;
*year += 1;
}
}
}
}
/**********************************************************************
free_dmy Ted Bohn April 2007
This subroutine frees the dmy array.
modifications:
**********************************************************************/
void free_dmy(dmy_struct **dmy) {
if (*dmy == NULL)
return;
free(*dmy);
}