GRASS GIS 7 Programmer's Manual  7.5.svn(2017)-r71769
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xbitand.c
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1 
2 #include <grass/gis.h>
3 #include <grass/raster.h>
4 #include <grass/calc.h>
5 
6 /****************************************************************
7 bitand(a,b,c,...) = a & b & c & ...
8 ****************************************************************/
9 
10 int f_bitand(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 }
#define CELL_TYPE
Definition: raster.h:11
#define SET_NULL_C(x)
Definition: calc.h:32
int f_bitand(int argc, const int *argt, void **args)
Definition: xbitand.c:10
#define IS_NULL_C(x)
Definition: calc.h:28
int columns
Definition: calc.c:12
Definition: calc.h:12
int CELL
Definition: gis.h:580