Segfault when trying to index pointer to pointers in function

Question

I\'m trying to do something with an array (malloc-ed), namely arr of a custom struct. The array is passed by reference to a function. I get a segfault whenever I tr

Answer 1

Your problem is the line

(*arr[1])->i = 3;

Because the subscripting operator's evaluation precedes the dereferencing's evaluation it is equivalent to the following:

(*(arr[1]))->i = 3;

This is obviously wrong. You need

(*arr)[1]->i = 3;

therefore.

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Notes:

• do not cast the result of malloc
• add #include to resolve the warning
• adding an extra level of indirection (foo*** pointing to foo**) is unnecessary; just copy by value

• (in addition to the upper note) a good old 1D array should actually be sufficient in your case

• call free after malloc