#include	<u.h>#include	<libc.h>#include	<bio.h> longBgetrune(Biobufhdr *bp){	int c, i;	Rune rune;	char str[UTFmax]; 	c = Bgetc(bp);	if(c < Runeself) {		/* one char */		bp->runesize = 1;		return c;	}	str[0] = c;	bp->runesize = 0; 	for(i=1;;) {		c = Bgetc(bp);		if(c < 0)			return c;		if (i >= sizeof str)			return Runeerror;		str[i++] = c; 		if(fullrune(str, i)) {			/* utf is long enough to be a rune, but could be bad. */			bp->runesize = chartorune(&rune, str);			if (rune == Runeerror)				bp->runesize = 0;	/* push back nothing */			else				/* push back bytes unconsumed by chartorune */				for(; i > bp->runesize; i--)					Bungetc(bp);			return rune;		}	}} intBungetrune(Biobufhdr *bp){ 	if(bp->state == Bracteof)		bp->state = Bractive;	if(bp->state != Bractive)		return Beof;	bp->icount -= bp->runesize;	bp->runesize = 0;	return 1;}