[KLUG Programming] Passing on variable argument lists.

[Adam Williams]

> >It appears not; va_start/arg/end/copy seems to be for processing
> >variable parameter lists in a function,  I just want to pass them into a
> >'subordinate' function.
> How is that not "processing"?
> >And it appears this can't be done directly - 
> >void ogo_call(char* ogourl, 
> >              char* ogouser, 
> >              char* ogopasswd,
> >              char* ogocall,
> >              char* ogoargs,
> >               ... ) {
> >...blah...blah...
> >  results = xmlrpc_client_call_server(&env, server,
> >                                     ogocall,
> >                                     ogoargs);
> >
> >- results in a segmentation fault (although it obviously compiles OK).
> Right, it can't be done directly. That is what I understand the var_args stuff 
> is for. AFAIK, it's used to write things like printf, which has the same 
> syntax that I think you want to use... extensible, or variable paramter lists).

Yep,  I was pretty sure I had it with -

#include<stdarg.h>
...blah...blah...
void ogo_call(char* ogourl, 
              char* ogouser, 
              char* ogopasswd,
              char* ogocall,
              char* ogoargs, 
              ... ) {
  va_list valist;
  va_start(valist, ogoargs);
  ...blah....blah
  results = xmlrpc_client_call_server(&env, server, ogocall, valist);
  va_end(valist);
  ...blah...blah...

- and I even found examples that almost seem to claim with certainty
that this is the correct way to do it.  And it compiled!

Only to be met with -
URL: http://kohocton/RPC2
  User:adam
  Password: ******
  Call: appointment.fetch
  In ogo_call
  In ogo_call: server setup
  In ogo_call: auth info setup
xmlrpc_data.c:488: Unknown type code when building value
- crap!

I found examples like -
#include <stdarg.h>
#include <stdio.h>
int  mysprintf (char* dest, char* source,...){
    va_list vlist;
    va_start(vlist,source);
    vsprintf(dest,"%s",vlist);
}
- which seems like exactly what I want to do.