.NLIST	TOC,SYM
.TITLE	$IERR
.SBTTL	ULBLIB 019	- Input Error processing
.IDENT	\V01.00\
.PSECT	.LIBC.
.ENABL	LC,GBL

; Copyright (c) 1998 by Mentec, Inc., Nashua, NH.
; All rights reserved
;
; This software is furnished under a license for use only on a
; single computer system and  may  be  copied  only  with  the
; inclusion of the above copyright notice.  This software,  or
; any other copies thereof, may not be provided  or  otherwise
; made available to any other person except for  use  on  such
; system and to one who agrees to these license  terms.  Title
; to  and  ownership of the software shall at all times remain
; in Mentec, Inc.
;
; The information in this document is subject to change without
; notice and should not be construed as a commitment by Digital
; Equipment Corporation, or Mentec, Inc.
;
; Digital and Mentec  assume  no  responsibility for the use or
; reliability of its software on equipment which is not supplied
; by Digital  or Mentec,  and listed  in the  Software  Product
; Description.
;+
; $IERR
; This routine determins which error occurred on input, and
; return the approriate error code to the user
;
;	R1	-> FDB
;
;	CALL	$IERR
;
;	C-bit	= 1
;	Error code set in F.ERR
;-

S$EERB	= 52			;EMT error return byte

$IERR::
	MOVB	#FE.EOF,R0	;Assume EOF
	MOVB	@#S$EERB,R2	;What kind of error?
	BEQ	1$		;EOF if zero
	MOVB	#FE.INE,R0	;Assume hard error
	DEC	R2		;Was it?
	BEQ	1$		;Branch if so
	MOVB	#FE.CNO,R0	;Set channel not open error
1$:	MOV	R0,F.ERR(R1)	;Set the error code
	SEC			;Set C-bit
	RETURN

.END