307 	if (f->fend > f->fnxt) {  in readwc()
311 		if (*f->fnxt == 0) {  in readwc()
312 			f->fnxt++;  in readwc()
327 		if (isascii(c = (unsigned char)*f->fnxt)) {  in readwc()
328 			f->fnxt++;  in readwc()
339 			if ((rest = f->fend - f->fnxt) < i) {  in readwc()
352 			mlen = mbtowc(&c, (char *)f->fnxt, i);  in readwc()
362 			c = (unsigned char)*f->fnxt;  in readwc()
366 		f->fnxt += mlen;  in readwc()
404 		(void) memcpy(f->fbuf, f->fnxt, rest);  in readb()
405 		f->fnxt = f->fbuf;  in readb()
406 		f->fend = f->fnxt + rest;  in readb()
451 	f->fnxt = f->fbuf;  in readb()
452 	f->fend = f->fnxt + (len + rest);  in readb()