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#include <u.h>
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#include <libc.h>
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char*
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cistrstr(char *s, char *sub)
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{
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	int c, csub, n;
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	csub = *sub;
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	if(csub == '\0')
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		return s;
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	if(csub >= 'A' && csub <= 'Z')
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		csub -= 'A' - 'a';
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	sub++;
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	n = strlen(sub);
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	for(; c = *s; s++){
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		if(c >= 'A' && c <= 'Z')
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			c -= 'A' - 'a';
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		if(c == csub && cistrncmp(s+1, sub, n) == 0)
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			return s;
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	}
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	return nil;
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}