//
// open.cocci (based on kmalloc 7)
//
//

@r exists@
local idexpression x;
statement S;
expression E;
identifier f,l;
position p1,p2,p3;
expression *ptr != NULL;
@@

(
if ((x@p1 = \(open\|fopen\)(...)) == NULL) S
|
x@p1 = \(open\|fopen\)(...);
...
if (x == NULL) S
)
<... when != x
     when != if (...) { <+...x...+> }
(
goto@p3 l;
|
x->f = E
)
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

cocci.print_main("",p1)
cocci.print_secs("", p2)