GRASS GIS 8 Programmer's Manual 8.4.1(2025)-45ca3179ab
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xand2.c
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1#include <grass/gis.h>
2#include <grass/raster.h>
3#include <grass/calc.h>
4
5/****************************************************************
6and2(a,b,c,...) = a && b && c && ...
7
8Differs from and() in that the boolean axioms:
9
10 false && x == false
11 x && false == false
12
13hold even when x is null.
14****************************************************************/
15
16int f_and2(int argc, const int *argt, void **args)
17{
18 CELL *res = args[0];
19 CELL **argz = (CELL **)args;
20 int i, j;
21
22 if (argc < 1)
23 return E_ARG_LO;
24
25 if (argt[0] != CELL_TYPE)
26 return E_RES_TYPE;
27
28 for (i = 1; i <= argc; i++)
29 if (argt[i] != CELL_TYPE)
30 return E_ARG_TYPE;
31
32 for (i = 0; i < columns; i++) {
33 res[i] = 1;
34 for (j = 1; j <= argc; j++) {
35 if (!IS_NULL_C(&argz[j][i]) && !argz[j][i]) {
36 res[i] = 0;
37 break;
38 }
39 if (IS_NULL_C(&argz[j][i]))
40 SET_NULL_C(&res[i]);
41 }
42 }
43
44 return 0;
45}
int columns
Definition calc.c:11
int f_and2(int argc, const int *argt, void **args)
Definition xand2.c:16