#include "lib9.h" char*utfrune(char *s, long c){	long c1;	Rune r;	int n; 	if(c < Runesync)		/* not part of utf sequence */		return strchr(s, c); 	for(;;) {		c1 = *(uchar*)s;		if(c1 < Runeself) {	/* one byte rune */			if(c1 == 0)				return 0;			if(c1 == c)				return s;			s++;			continue;		}		n = chartorune(&r, s);		if(r == c)			return s;		s += n;	}	return 0;}