stock FormatQuery(Format[], va_args<>)
{
    new
        out[512];
    va_format(out, sizeof(out), Format, va_start<1>);
    return out;
}
//--- used like this
print( FormatQuery("%s - %s AW %d %d %d %f", "ABC", "yo", 1, 2, 3 , 5.5) );

//=================

#define BYTES_PER_CELL 4
// HUGE credit to ZeeX for finally cracking this problem:
// [url=http://forum.sa-mp.com/index.php?topic=79810.msg901721#msg901721]http://forum.sa-mp.com/index.php?topic=79810.msg901721#msg901721[/url]
stock FormatQuery2( fstring[], {Float, _}:...)
{
    // This is the number of parameters which are not variable that are passed
    // to this function (i.e. the number of named parameters).
    static const
        STATIC_ARGS = 3;
    // Get the number of variable arguments.
    new
        n = (numargs() - STATIC_ARGS) * BYTES_PER_CELL;
    if(n)
    {
        new
            message[144],
            arg_start,
            arg_end;

        // Load the real address of the last static parameter. Do this by
        // loading the address of the last known static parameter and then
        // adding the value of [FRM].
        #emit CONST.alt        fstring
        #emit LCTRL          5
        #emit ADD
        #emit STOR.S.pri        arg_start

        // Load the address of the last variable parameter. Do this by adding
        // the number of variable parameters on the value just loaded.
        #emit LOAD.S.alt        n
        #emit ADD
        #emit STOR.S.pri        arg_end

        // Push the variable arguments. This is done by loading the value of
        // each one in reverse order and pushing them. I'd love to be able to
        // rewrite this to use the values of pri and alt for comparison,
        // instead of having to constantly load and reload two variables.
        do
        {
            #emit LOAD.I
            #emit PUSH.pri
            arg_end -= BYTES_PER_CELL;
            #emit LOAD.S.pri      arg_end
        }
        while(arg_end > arg_start);

        // Push the static format parameters.
        #emit PUSH.S          fstring
        #emit PUSH.C          144
        #emit PUSH.ADR         message

        // Now push the number of arguments passed to format, including both
        // static and variable ones and call the function.
        n += BYTES_PER_CELL * 3;
        #emit PUSH.S          n
        #emit SYSREQ.C         format

        // Remove all data, including the return value, from the stack.
        n += BYTES_PER_CELL;
        #emit LCTRL          4
        #emit LOAD.S.alt        n
        #emit ADD
        #emit SCTRL          4

        return print(message); // here D:\...pwn(390) : error 079: inconsistent return types (array & non-array)
    }
    return fstring;
}