#include <stdlib.h>
#include <stdarg.h>
#include <strings.h>

#include "plot.h"
#include "istack.h"
#include "dirimpl.h"
#include "dir-op.h"

DIRRV dir_op(void **privp __attribute__((__unused__)), DIROP op, ...)
{
 va_list ap;
 char *arg;

 va_start(ap,op);
 switch (op)
  { default:
       abort();
       break;
    case DIROP_INIT:
       return(DIRRV_MORE);
       break;
    case DIROP_ARG:
       arg = va_arg(ap,char *);
       if (arg == 0)
	{ istack_err("missing operation");
	}
       else
	{      if (!strcmp(arg,"set")) plot_op(OP_SET);
	  else if (!strcmp(arg,"min")) plot_op(OP_MIN);
	  else if (!strcmp(arg,"max")) plot_op(OP_MAX);
	  else
	   { istack_err("invalid operation - set, min, max");
	   }
	}
       return(DIRRV_NOMORE);
       break;
  }
 va_end(ap);
 abort();
}