if statements with = in them

[armageddon85]

I have a quick Q.

if ((q = p->from1) && (!p->from1->fq)) {

in this statement is q being set to p->from1 or is it checking if q is equal to p->from1.

I know == is checking to see if they are equal, im just not sure about this one.

[Return 0]

q is being set to p->from1