ptoi
if ((k == CHAR && c == ptoi(f->re[p[i]].lval.np))
extern int ptoi(void *);
fp = redirect(ptoi(a[1]), a[2]);
pair = ptoi(a[3]);
arg3type = ptoi(a[3]);
t = ptoi(a[0]);
fp = redirect(ptoi(a[1]), a[2]);
n = ptoi(a[0]); /* argument number, counting from 0 */
mode = ptoi(a[1]);