GRASS GIS 7 Programmer's Manual
7.9.dev(2021)-e5379bbd7
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xor2.c
Go to the documentation of this file.
1
2
#include <
grass/gis.h
>
3
#include <
grass/raster.h
>
4
#include <
grass/calc.h
>
5
6
/****************************************************************
7
or2(a,b,c,...) = a || b || c || ...
8
9
Differs from or() in that the boolean axioms:
10
11
true || x == true
12
x || true == true
13
14
hold even when x is null.
15
****************************************************************/
16
17
int
f_or2
(
int
argc,
const
int
*argt,
void
**args)
18
{
19
CELL
*res = args[0];
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] != argt[0])
30
return
E_ARG_TYPE
;
31
32
for
(i = 0; i <
columns
; i++) {
33
res[i] = 0;
34
for
(j = 1; j <= argc; j++) {
35
CELL
*arg = args[j];
36
if
(!
IS_NULL_C
(&arg[i]) && arg[i]) {
37
res[i] = 1;
38
break
;
39
}
40
if
(
IS_NULL_C
(&arg[i]))
41
SET_NULL_C
(&res[i]);
42
}
43
}
44
45
return
0;
46
}
CELL_TYPE
#define CELL_TYPE
Definition:
raster.h:11
SET_NULL_C
#define SET_NULL_C(x)
Definition:
calc.h:32
E_ARG_TYPE
Definition:
calc.h:14
IS_NULL_C
#define IS_NULL_C(x)
Definition:
calc.h:28
columns
int columns
Definition:
calc.c:12
raster.h
gis.h
f_or2
int f_or2(int argc, const int *argt, void **args)
Definition:
xor2.c:17
E_ARG_LO
Definition:
calc.h:12
CELL
int CELL
Definition:
gis.h:602
E_RES_TYPE
Definition:
calc.h:15
calc.h
lib
calc
xor2.c
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