TITLE	"Z3SHEMPT - Z3lib 4.0"
;================================================================
;   The Libraries, Version 4, (C) 1989 by Alpha Systems Corp.
;----------------------------------------------------------------
; Author  : Harold F. Bower
;		Derived from Z3SHEMPT.Z80 Ver 1.1 by Richard Conn
; Date    : 8 Mar 87
; Version : 1.2
; Module  : Z3SHEMPT
; Abstract: This module contains the routine SHEMPTY which tests
;	the shell stack and returns a flag indicating the results
;	of the test
; Revision:
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

;  Module Entry Points

	PUBLIC		SHEMPTY

;  External References

	EXT		GETSH

	.Z80
	CSEG
;===============================================================
; NAME - SHEMPTY
; Entry: - None
; Exit : A = 0, Zero Flag Set (Z) if Empty
;	     A <> 0, Zero Flag Reset (NZ) if NOT Empty
; Uses : AF
; Special Requirements: None
;===============================================================

SHEMPTY: PUSH	HL		;save HL
	CALL	GETSH		;get ptr to shell stack
	JR	Z,NOSHELL	;error if no shell stack
	LD	A,(HL)		;check first element

NOSHELL: OR	A		;set flags
	POP	HL		;get HL
	RET

	END