GRASS GIS 8 Programmer's Manual  8.4.0dev(2024)-381f661b3f
xbitxor.c
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1 #include <grass/gis.h>
2 #include <grass/raster.h>
3 #include <grass/calc.h>
4 
5 /****************************************************************
6 bitxor(a,b,c,...) = a ^ b ^ c ^ ...
7 ****************************************************************/
8 
9 int 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 }
@ E_RES_TYPE
Definition: calc.h:14
@ E_ARG_TYPE
Definition: calc.h:13
@ E_ARG_LO
Definition: calc.h:11
#define IS_NULL_C(x)
Definition: calc.h:26
int columns
Definition: calc.c:11
#define SET_NULL_C(x)
Definition: calc.h:30
int CELL
Definition: gis.h:625
#define CELL_TYPE
Definition: raster.h:11
int f_bitxor(int argc, const int *argt, void **args)
Definition: xbitxor.c:9