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xshiftru.c
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#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/calc.h>
/****************************************************************
shiftru(a,b) = (unsigned) a >> b
****************************************************************/
int f_shiftru(int argc, const int *argt, void **args)
{
CELL *res = args[0];
CELL *arg1 = args[1];
CELL *arg2 = args[2];
int i;
if (argc < 2)
return E_ARG_LO;
if (argc > 2)
return E_ARG_HI;
if (argt[1] != CELL_TYPE || argt[2] != CELL_TYPE)
return E_ARG_TYPE;
if (argt[0] != CELL_TYPE)
return E_RES_TYPE;
for (i = 0; i < columns; i++) {
if (IS_NULL_C(&arg1[i]) || IS_NULL_C(&arg2[i]))
SET_NULL_C(&res[i]);
else
res[i] = ((unsigned int)arg1[i]) >> arg2[i];
}
return 0;
}
columns
int columns
Definition calc.c:11
f_shiftru
int f_shiftru(int argc, const int *argt, void **args)
Definition xshiftru.c:9