(unsigned long) membot, (unsigned long) memtop, memtop - membot);
(unsigned long) membot, (unsigned long) memtop, (int)memtop - membot);
showall(v, t)    Char **v;    struct command *t;{    memtop = (char *) sbrk(0);    (void) fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%d).\n",	    (unsigned long) membot, (unsigned long) memtop, memtop - membot);}