GRASS GIS 8 Programmer's Manual 8.2.1(2023)-exported
xbitor.c
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1
2#include <grass/gis.h>
3#include <grass/raster.h>
4#include <grass/calc.h>
5
6/****************************************************************
7bitor(a,b,c,...) = a | b | c | ...
8****************************************************************/
9
10int f_bitor(int argc, const int *argt, void **args)
11{
12 CELL *res = args[0];
13 CELL **argz = (CELL **) args;
14 int i, j;
15
16 if (argc < 1)
17 return E_ARG_LO;
18
19 if (argt[0] != CELL_TYPE)
20 return E_RES_TYPE;
21
22 for (i = 1; i <= argc; i++)
23 if (argt[i] != CELL_TYPE)
24 return E_ARG_TYPE;
25
26 for (i = 0; i < columns; i++) {
27 res[i] = 0;
28 for (j = 1; j <= argc; j++) {
29 if (IS_NULL_C(&argz[j][i])) {
30 SET_NULL_C(&res[i]);
31 break;
32 }
33 res[i] |= argz[j][i];
34 }
35 }
36
37 return 0;
38}
int columns
Definition: calc.c:12
int f_bitor(int argc, const int *argt, void **args)
Definition: xbitor.c:10