xmul.c

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#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/calc.h>
 
/****************************************************************
mul(a,b) = a * b
****************************************************************/
 
int f_mul(int argc, const int *argt, void **args)
{
    int i, j;
 
    if (argc < 1)
        return E_ARG_LO;
 
    for (i = 1; i <= argc; i++)
        if (argt[i] != argt[0])
            return E_ARG_TYPE;
 
    switch (argt[0]) {
    case CELL_TYPE: {
        CELL *res = args[0];
        CELL **argz = (CELL **)args;
 
        for (i = 0; i < columns; i++) {
            res[i] = 1;
            for (j = 1; j <= argc; j++) {
                if (IS_NULL_C(&argz[j][i])) {
                    SET_NULL_C(&res[i]);
                    break;
                }
                res[i] *= argz[j][i];
            }
        }
        return 0;
    }
    case FCELL_TYPE: {
        FCELL *res = args[0];
        FCELL **argz = (FCELL **)args;
 
        for (i = 0; i < columns; i++) {
            res[i] = 1;
            for (j = 1; j <= argc; j++) {
                if (IS_NULL_F(&argz[j][i])) {
                    SET_NULL_F(&res[i]);
                    break;
                }
                res[i] *= argz[j][i];
            }
        }
        return 0;
    }
    case DCELL_TYPE: {
        DCELL *res = args[0];
        DCELL **argz = (DCELL **)args;
 
        for (i = 0; i < columns; i++) {
            res[i] = 1;
            for (j = 1; j <= argc; j++) {
                if (IS_NULL_D(&argz[j][i])) {
                    SET_NULL_D(&res[i]);
                    break;
                }
                res[i] *= argz[j][i];
            }
        }
        return 0;
    }
    default:
        return E_INV_TYPE;
    }
}