/****************************************************************
 *								*
 *	Copyright 2011 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

#include "mdef.h"

#include "cmd.h"
#include "compiler.h"
#include "indir_enum.h"
#include "opcode.h"
#include "toktyp.h"

LITREF mval	literal_zero;

/* Halt the process similar to op_halt but allow a return code to be specified. If no return code
 * is specified, return code 0 is used as a default (making it identical to op_halt).
 */
int m_zhalt(void)
{
	triple	*triptr;
	oprtype ot;
	int	status;
	DCL_THREADGBL_ACCESS;

	SETUP_THREADGBL_ACCESS;
	/* Let m_halt() handle the case of the missing return code */
	if ((TK_SPACE == TREF(window_token)) || (TK_EOL == TREF(window_token)))
		return m_halt();
	switch (status = expr(&ot, MUMPS_NUM))		/* NOTE assignment */
	{
	case EXPR_FAIL:
		return FALSE;
	case EXPR_GOOD:
		triptr = newtriple(OC_ZHALT);
		triptr->operand[0] = ot;
		return TRUE;
	case EXPR_INDR:
		make_commarg(&ot, indir_zhalt);
		return TRUE;
	default:
		GTMASSERT;
	}
	return FALSE; /* This should never get executed, added to make compiler happy */
}