GRASS GIS 8 Programmer's Manual 8.4.1(2025)-45ca3179ab
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xbitxor.c
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1#include <grass/gis.h>
2#include <grass/raster.h>
3#include <grass/calc.h>
4
5/****************************************************************
6bitxor(a,b,c,...) = a ^ b ^ c ^ ...
7****************************************************************/
8
9int f_bitxor(int argc, const int *argt, void **args)
10{
11 CELL *res = args[0];
12 CELL **argz = (CELL **)args;
13 int i, j;
14
15 if (argc < 1)
16 return E_ARG_LO;
17
18 if (argt[0] != CELL_TYPE)
19 return E_RES_TYPE;
20
21 for (i = 1; i <= argc; i++)
22 if (argt[i] != CELL_TYPE)
23 return E_ARG_TYPE;
24
25 for (i = 0; i < columns; i++) {
26 res[i] = 0;
27 for (j = 1; j <= argc; j++) {
28 if (IS_NULL_C(&argz[j][i])) {
29 SET_NULL_C(&res[i]);
30 break;
31 }
32 res[i] ^= argz[j][i];
33 }
34 }
35
36 return 0;
37}
int columns
Definition calc.c:11
int f_bitxor(int argc, const int *argt, void **args)
Definition xbitxor.c:9