xnull.c

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#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/calc.h>
 
/****************************************************************
null() null values
****************************************************************/
 
int f_null(int argc, const int *argt, void **args)
{
    CELL *res = args[0];
    int i;
 
    if (argc > 0)
        return E_ARG_HI;
 
    if (argt[0] != CELL_TYPE)
        return E_RES_TYPE;
 
    for (i = 0; i < columns; i++)
        SET_NULL_C(&res[i]);
 
    return 0;
}