argv_exp0
if (argv_exp0(sp, ecp, ecp->cp, ecp->clen))
if (argv_exp0(sp, ecp, t, p - t))
if (argv_exp0(sp, ecp, t, p - t))
if (argv_exp0(sp, ecp, p, ecp->cp - p))
if (argv_exp0(sp, cmdp, sp->cargv[-1], strlen(sp->cargv[-1])))
if (argv_exp0(sp,
(void)argv_exp0(sp, excp, bp, len);
int argv_exp0(SCR *, EXCMD *, char *, size_t);