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#include <u.h>
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#include <libc.h>
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char*
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utfrrune(char *s, long c)
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{
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	long c1;
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	Rune r;
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	char *s1;
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	if(c < Runesync)		/* not part of utf sequence */
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		return strrchr(s, c);
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	s1 = 0;
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	for(;;) {
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		c1 = *(uchar*)s;
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		if(c1 < Runeself) {	/* one byte rune */
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			if(c1 == 0)
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				return s1;
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			if(c1 == c)
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				s1 = s;
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			s++;
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			continue;
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		}
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		c1 = chartorune(&r, s);
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		if(r == c)
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			s1 = s;
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		s += c1;
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	}
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}