#include <stdarg.h>

#include "lx.h"

#include "proto.h"
#include "internal.h"

void lx_ChangeGC_va(LX_CONN *xc, LX_XID gc, ...)
{
 va_list ap;
 int key;
#define SIMPLE(name,type,suf,bit,field)\
	type arg_##name;
#define MAPPED(name,converter,bit,field)\
	LX_XID arg_##name;						\
	int proto_##name;
#define GRAPHICSEXPOSURES(name,type,suf,bit,field) SIMPLE(name,type,suf,bit,field)
#define CLIPMASK(name,type,suf,bit,field) SIMPLE(name,type,suf,bit,field)
 GCFIELDS
#undef SIMPLE
#undef MAPPED
#undef GRAPHICSEXPOSURES
#undef CLIPMASK
 unsigned int mask;
 int o;
 unsigned char req[104];

 if (xc->flags & XCF_FAIL)
  { lx__bad_call(xc,"lx_ChangeGC_va");
    return;
  }
 mask = 0;
 va_start(ap,gc);
 while <"args"> (1)
  { key = va_arg(ap,int);
#define SIMPLE(name,type,suf,bit,field)\
	case LX__GCV_##name:						\
		arg_##name = va_arg(ap,type);				\
		mask |= bit;						\
		break;
#define MAPPED(name,converter,bit,field)\
	case LX__GCV_##name:						\
		arg_##name = va_arg(ap,unsigned long int);		\
		proto_##name = converter(arg_##name);			\
		if (proto_##name < 0)					\
		 { lx__bad_call(xc,"lx_ChangeGC_va");			\
		   return;						\
		 }							\
		mask |= bit;						\
		break;
#define GRAPHICSEXPOSURES(name,type,suf,bit,field)\
	case LX__GCV_##name:						\
		arg_##name = lx__boolean_to_proto(va_arg(ap,type));	\
		mask |= bit;						\
		break;
#define CLIPMASK(name,type,suf,bit,field)\
	case LX__GCV_##name:						\
		arg_##name = va_arg(ap,type);				\
		if (arg_##name == LX_GCCLIPMASK_None) arg_##name = 0;	\
		mask |= bit;						\
		break;
    switch (key)
     { GCFIELDS
       case LX__GCV_END:
	  break <"args">;
       default:
	  lx_abort();
	  break;
     }
#undef SIMPLE
#undef MAPPED
#undef GRAPHICSEXPOSURES
#undef CLIPMASK
  }
 va_end(ap);
 req[0] = XP_REQ_ChangeGC;
 req[1] = 0;
 // req[2] and [3] filled in later
 w_card32(&req[4],gc);
 w_card32(&req[8],mask);
 o = 12;
#define SIMPLE(name,type,suf,bit,field)\
	if (mask & bit) { mask &= ~bit; w_card32(&req[o],arg_##name); o += 4; }
#define MAPPED(name,converter,bit,field)\
	if (mask & bit) { mask &= ~bit; w_card32(&req[o],proto_##name); o += 4; }
#define GRAPHICSEXPOSURES(name,type,suf,bit,field) SIMPLE(name,type,suf,bit,field)
#define CLIPMASK(name,type,suf,bit,field) SIMPLE(name,type,suf,bit,field)
 GCFIELDS
#undef SIMPLE
#undef MAPPED
#undef GRAPHICSEXPOSURES
#undef CLIPMASK
 // XXX update GC shdadow, if any
 w_card16(&req[2],o>>2);
 lx__send_req(xc,&req[0],o);
}