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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libbio/bgetrune.c – Rev 2

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