Tay Ray Chuan <rctay89@xxxxxxxxx> writes:
> On Thu, Jul 7, 2011 at 1:57 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote:
>> Tay Ray Chuan <rctay89@xxxxxxxxx> writes:
>>
>>> Group free()'s that are called when a malloc() fails in
>>> xdl_prepare_ctx(), making for more readable code.
>>
>> Nicer, but I wonder if we can get away with a single label that lets us
>> abort with freeing whatever we have allocated by making sure that the
>> various pointer fields and variables are initialized to NULL, which may
>> lead to even more readable code.
>
> Pardon my dullness. Do you mean to check if the various fields are set
> to NULL upon allocation, and free()'ing them if so?
What I meant was that, instead of doing this:
func() {
if (somefunc(&A, ...) < 0)
goto failA;
... do something ...
B = someotheralloc();
if (!B)
goto failB;
... do something ...
C = yetanotheralloc();
if (!C)
goto failC;
... do things using A, B, C ...
return 0;
failC:
free(B);
failB:
free(A);
failA:
return -1;
}
it would be easier to follow if you did:
func() {
A = B = C = NULL;
if (somefunc(&A, ...) < 0)
goto fail;
... do something ...
B = someotheralloc();
if (!B)
goto fail;
... do something ...
C = yetanotheralloc();
if (!C)
goto fail;
... do things using A, B, C ...
fail:
free(B);
free(A);
return -1;
}
Especially when you have more than 2 such fail labels.
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