Passing Through A Variable Argument List

Hello,

I'm just trying to define a small API for this wickedy thing I'm doing. While some functions are complex, others merely wrap certain C runtime functions.

Right now I'm trying to define a function that wraps sscanf. As this function uses a variable argument list, assuming I declare the wrapper with the same arguments how do I pass it a va_arg?

Code:

---

int String_Scan(char *buffer, char *format, ...)
{
  // ?
  // Profit
}

---

You might want to have a look at this thread, especially post #4.

I don't think I could use a for loop and make individual calls to sscanf because I would also have to look through the format string and make sure it points to the nearest specifier. Seems to over-complicate things somewhat. :confused:

I think you have to. You can just pass over "...". I think you have to do the conversion yourself.


Quzah.

I suppose rather than fluffing around I could just use:-

Code:

---

#define String_Scan  sscanf

---

;)

Well if String_Scan ultimately calls sscanf, then you need to use the va_arg stuff and pass the "..." onto vsscanf()

In fact, it's generally a lot easier all round if you begin by providing vString_Scan() where the ... is replaced by a va_arg parameter, then String_Scan() is just a very thin wrapper around vString_Scan() which does all the work (and calls vsscanf).

Quote:

---

Originally Posted by SMurf

Right now I'm trying to define a function that wraps sscanf. As this function uses a variable argument list, assuming I declare the wrapper with the same arguments how do I pass it a va_arg?

---

vsscanf() is meant for this.