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xisnull.c
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#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/calc.h>
/**********************************************************************
isnull(x)
return 1 if x is null, 0 otherwise
**********************************************************************/
int f_isnull(int argc, const int *argt, void **args)
{
int *res = args[0];
int i;
if (argc < 1)
return E_ARG_LO;
if (argc > 1)
return E_ARG_HI;
if (argt[0] != CELL_TYPE)
return E_RES_TYPE;
switch (argt[1]) {
case CELL_TYPE: {
CELL *arg1 = args[1];
for (i = 0; i < columns; i++)
res[i] = IS_NULL_C(&arg1[i]) ? 1 : 0;
return 0;
}
case FCELL_TYPE: {
FCELL *arg1 = args[1];
for (i = 0; i < columns; i++)
res[i] = IS_NULL_F(&arg1[i]) ? 1 : 0;
return 0;
}
case DCELL_TYPE: {
DCELL *arg1 = args[1];
for (i = 0; i < columns; i++)
res[i] = IS_NULL_D(&arg1[i]) ? 1 : 0;
return 0;
}
default:
return E_INV_TYPE;
}
}
int c_isnull(int argc, int *argt)
{
if (argc < 1)
return E_ARG_LO;
if (argc > 1)
return E_ARG_HI;
argt[0] = CELL_TYPE;
return 0;
}
columns
int columns
Definition calc.c:11
f_isnull
int f_isnull(int argc, const int *argt, void **args)
Definition xisnull.c:10
c_isnull
int c_isnull(int argc, int *argt)
Definition xisnull.c:50