stack_block
struct stack_block *prev;
struct stack_block stackbase;
struct stack_block *stackp = &stackbase;
struct stack_block *sp;
sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
struct stack_block *sp;
struct stack_block *oldstackp;
struct stack_block *sp;
sizeof(struct stack_block) - MINSIZE + newlen);
struct stack_block *stackp;