// Copyright status: this file is in the public domain.

#include "lx.h"

#include "internal.h"

static void chain_done(LX_CONN *xc)
{
 int savedop;
 int savedn;

 if (xc->chain)
  { savedop = xc->traceop;
    savedn = xc->tracen;
    xc->traceop = TRACEOP_IDLE;
    xc->tracen = -1;
    (*xc->chain->done)(xc,xc->chainpriv);
    xc->traceop = savedop;
    xc->tracen = savedn;
  }
}

void *lx__chainable(LX_CONN *xc, CHAINER *ch)
{
 if (xc->chain != ch)
  { chain_done(xc);
    xc->chain = ch;
    xc->chainpriv = (*ch->start)(xc);
  }
 return(xc->chainpriv);
}

int lx__nochain(LX_CONN *xc)
{
 if (! xc->chain) return(0);
 chain_done(xc);
 xc->chain = 0;
 xc->chainpriv = 0;
 return(1);
}