Clankers: code had several

strcasecmp("XYZ", s, 3)
strcasecmp("ABCD", s, 4)

I added
strcasecmp("MN", s, strlen(s))

and Copilot says: "No, no, no. This will read past the length of "MN". Change the length parameter.

🙈

Edit: it was strncasecmp() of course, as @hyc correctly pointed out.

@icing what it lacks in competence, it sure makes up for in confidence

@icing my assumption on what is being checked is likely wrong, but if not, all three comparions are :p (inputs XYZFOO and M)

@jelte Yes, they give wrong results on prefixes. I am fixing that.

However, I wanted to illustrate how the LLM pattern matching goes haywire here...

@icing not strncasecmp?

@hyc yeah, right sorry, miswrote.