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#include <u.h>
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#include <libc.h>
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/*
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 * Return pointer to first occurrence of s2 in s1,
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 * 0 if none
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 */
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char*
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utfutf(char *s1, char *s2)
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{
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	char *p;
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	long f, n1, n2;
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	Rune r;
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	n1 = chartorune(&r, s2);
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	f = r;
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	if(f <= Runesync)		/* represents self */
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		return strstr(s1, s2);
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	n2 = strlen(s2);
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	for(p=s1; p=utfrune(p, f); p+=n1)
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		if(strncmp(p, s2, n2) == 0)
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			return p;
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	return 0;
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}