__sfvwrite
retval = __sfvwrite(fp, &uio);
if (__sfvwrite(fp, &uio) != 0)
extern int __sfvwrite(FILE *, struct __suio *);
if (__sfvwrite(fp, &uio) != 0)
retval = __sfvwrite(stdout, &uio) ? EOF : '\n';
retval = __sfvwrite(fp, &uio);
err = __sfvwrite(fp, uio);
return (__sfvwrite(fp, &uio) != EOF ? (wint_t)wc : WEOF);
__sfvwrite(io->fp, &io->uio);