sscanf match double

sscanf(str, "%lf", &num);

Here I try to parse a开发者_如何学JAVA double. It catches inf which is fine. However it also catches infififi as inf, which is wrong in my case.

Other examples would be nandoscope as nan and 123abc as 123. How to fix this behavior?

That's by design, so it doesn't need fixing. Perhaps you can rewrite your code to read a delimiter after the double, or see if sscanf is reading the whole string.