progmem and sprintf

ok, doesn't work.  how cast or manipulate message does?  can see commented out line can put message in buffer strcpy_p.  works great.  can't figure out sprintf_p. 

code: [select]


void setup(){
 
  serial.begin(9600);
  serial.println("the serial works");
 
  printoutmessage(f("all base belong us!"));
 
}


void loop(){}

void printoutmessage(const __flashstringhelper* message){
 
  char buffer[40];
 
  //strcpy_p(buffer , (const prog_char*) message);
 
  sprintf_p(buffer, pstr("ha ha %s") , message);
 
  serial.println(buffer);
 
}



by way, know print overloaded this.  serial.print line there demonstration.  need able fill char buffer sprintf. 

tried too, doesn't work.  ends printing garbage on screen.  don't know it's trying read from.  progmem stuff has been spooky business me. 

code: [select]

sprintf_p(buffer, pstr("ha ha %s") , (char*) pgm_read_word (&message));

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