I'm parsing a string (a `char*`) and I'm using `sscanf` to parse numbers from the string into doubles, like so:

```
// char* expression;
double value = 0;
sscanf(expression, "%lf", &value);

```

This works great, but I would then like to continue parsing the string through conventional means. I need to know how many characters have been parsed by `sscanf` so that I may resume my manual parsing from the new offset.

Obviously, the easiest way would be to somehow calculate the number of characters that `sscanf` parses, but if there's no simple way to do that, I *am* open to alternative double parsing options. However, I'm currently using `sscanf` because it's fast, simple, and readable. Either way, I just need a way to evaluate the double and continue parsing after it.