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extern end;

static void *curbrk = (char*)&end;

void *

sbrk(incr)

int incr; {

        extern int errno;

        extern int _brk(void *);

        void *ptr = curbrk;

        int t;

        if (incr == 0)

                return curbrk;

        t = _brk (curbrk + incr);

        if (t == -1 && errno)

                return (void *)-1;

        curbrk = ((char *)curbrk) + incr;

        return ptr;

}