From: CRDGW2::CRDGW2::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX" 26-JUN-1989 16:45 To: MRGATE::"ARISIA::EVERHART" Subj: How to avoid IF(.NOT.STATUS) CALL LIB$SIGNAL(%VAL(STATUS)) Message-Id: <8906262032.AA07018@crdgw1.ge.com> Received: From KL.SRI.COM by CRVAX.SRI.COM with TCP; Mon, 26 JUN 89 12:15:24 PDT Received: from CUNYVM.CUNY.EDU by KL.SRI.COM with TCP; Mon, 26 Jun 89 12:07:05 PDT Received: from UKACRL.BITNET by CUNYVM.CUNY.EDU (IBM VM SMTP R1.1) with BSMTP id 4654; Mon, 26 Jun 89 14:52:19 EDT Received: from RL.IB by UKACRL.BITNET (Mailer X1.25) with BSMTP id 6495; Mon, 26 Jun 89 18:13:35 BST Received: from RL.IB by UK.AC.RL.IB (Mailer X1.25) with BSMTP id 4306; Mon, 26 Jun 89 18:13:34 BS Via: UK.AC.KCL.PH.IPG; 26 JUN 89 18:13:29 BST Date: 26-JUN-1989 18:13:27 GMT From: SYSMGR%IPG.PH.KCL.AC.UK@CUNYVM.CUNY.EDU To: info-vax@KL.SRI.COM Subject: How to avoid IF(.NOT.STATUS) CALL LIB$SIGNAL(%VAL(STATUS)) Sender: JANET "SYSMGR@UK.AC.KCL.PH.IPG" (Nigel Arnot) It's been a while since I submitted anything. The following is the answer for anyone who is getting fed up with inserting IF( .NOT.STATUS) CALL LIB$SIGNAL( %VAL( STATUS)) in their programs. The comments at the top of CALLVMS.MAR should make things clear; CALLVMSTEST.FOR was used while I was testing it, and also as an example. Nigel Arnot (NRA%KCL.PH.IPG@UKACRL.BITNET) PS apologies if someone else posted similar recently, my infovax is about two weeks delayed at present! $! ................... Cut between dotted lines and save. ................... $!........................................................................... $! VAX/VMS archive file created by VMS_SHARE V06.10A 3-MAR-1989. $! $! VMS_SHARE was written by James Gray (Gray:OSBUSouth@Xerox.COM) from $! VMS_SHAR by Michael Bednarek (U3369429@ucsvc.dn.mu.oz.au). $! $! To unpack, simply save, concatinate all parts into one file and $! execute (@) that file. $! $! This archive was created by user SYSMGR $! on 22-JUN-1989 13:51:30.10. $! $! It contains the following 2 files: $! CALLVMS.MAR $! CALLVMSTEST.FOR $! $!============================================================================ $ SET SYMBOL/SCOPE=( NOLOCAL, NOGLOBAL ) $ VERSION = F$GETSYI( "VERSION" ) $ IF VERSION .GES "V4.4" THEN GOTO VERSION_OK $ WRITE SYS$OUTPUT "You are running VMS ''VERSION'; ", - "VMS_SHARE V06.10A 3-MAR-1989 requires VMS V4.4 or higher." $ EXIT 44 ! SS$_ABORT $VERSION_OK: $ GOTO START $! $UNPACK_FILE: $ WRITE SYS$OUTPUT "Creating ''FILE_IS'" $ DEFINE/USER_MODE SYS$OUTPUT NL: $ EDIT/TPU/COMMAND=SYS$INPUT/NODISPLAY/OUTPUT='FILE_IS'/NOSECTION - VMS_SHARE_DUMMY.DUMMY b_part := CREATE_BUFFER( "$Part", GET_INFO( COMMAND_LINE, "file_name" ) ) ; s_file_spec := GET_INFO( COMMAND_LINE, "output_file" ); SET( OUTPUT_FILE , b_part, s_file_spec ); b_errors := CREATE_BUFFER( "$Errors" ); i_errors := 0; pat_beg_1 := ANCHOR & "-+-+-+ Beginning"; pat_beg_2 := LINE_BEGIN & "+-+-+-+ Beginning"; pat_end := ANCHOR & "+-+-+-+-+ End"; POSITION ( BEGINNING_OF( b_part ) ); LOOP EXITIF SEARCH( SPAN( ' ' )@r_trail & LINE_END, FORWARD) = 0; POSITION( r_trail ); ERASE( r_trail ); ENDLOOP ; POSITION( BEGINNING_OF( b_part ) ); i_append_line := 0; LOOP EXITIF MARK ( NONE ) = END_OF( b_part ); s_x := ERASE_CHARACTER( 1 ) ; IF s_x = '+' THEN r_skip := SEARCH( pat_beg_1, FORWARD, EXACT ); IF r_skip <> 0 THEN s_x := ''; MOVE_HORIZONTAL( -CURRENT_OFFSET ); ERASE_LINE; ENDIF ; ENDIF; IF s_x = '-' THEN r_skip := SEARCH( pat_end, FORWARD, EXACT ) ; IF r_skip <> 0 THEN s_x := ''; MOVE_HORIZONTAL( -CURRENT_OFFSET ); m_skip := MARK( NONE ); r_skip := SEARCH( pat_beg_2, FORWARD, EXACT ); IF r_skip <> 0 THEN POSITION( END_OF( r_skip ) ); MOVE_HORIZONTAL( -CURRENT_OFFSET ) ; MOVE_VERTICAL( 1 ); MOVE_HORIZONTAL( -1 ); ELSE POSITION( END_OF( b_part ) ); ENDIF; ERASE( CREATE_RANGE( m_skip, MARK( NONE ), NONE ) ); ENDIF; ENDIF ; IF s_x = 'V' THEN s_x := ''; IF i_append_line <> 0 THEN APPEND_LINE ; MOVE_HORIZONTAL( -CURRENT_OFFSET ); ENDIF; i_append_line := 1 ; MOVE_VERTICAL( 1 ); ENDIF; IF s_x = 'X' THEN s_x := ''; IF i_append_line <> 0 THEN APPEND_LINE; MOVE_HORIZONTAL( -CURRENT_OFFSET ); ENDIF ; i_append_line := 0; MOVE_VERTICAL( 1 ); ENDIF; IF s_x <> '' THEN i_errors := i_errors + 1; s_text := CURRENT_LINE; POSITION( b_errors ); COPY_TEXT ( "The following line could not be unpacked properly:" ); SPLIT_LINE ; COPY_TEXT( s_x ); COPY_TEXT( s_text ); POSITION( b_part ); MOVE_VERTICAL ( 1 ); ENDIF; ENDLOOP; POSITION( BEGINNING_OF( b_part ) ); LOOP r_x := SEARCH ( "`", FORWARD, EXACT ); EXITIF r_x = 0; POSITION( r_x ); ERASE_CHARACTER ( 1 ); COPY_TEXT( ASCII( INT( ERASE_CHARACTER( 3 ) ) ) ); ENDLOOP ; IF i_errors = 0 THEN SET( NO_WRITE, b_errors, ON ); ELSE POSITION ( BEGINNING_OF( b_errors ) ); COPY_TEXT( FAO ( "The following !UL errors were detected while unpacking !AS", i_errors , s_file_spec ) ); SPLIT_LINE; SET( OUTPUT_FILE, b_errors, "SYS$COMMAND" ) ; ENDIF; EXIT; $ DELETE VMS_SHARE_DUMMY.DUMMY;* $ CHECKSUM 'FILE_IS $ WRITE SYS$OUTPUT " CHECKSUM ", - F$ELEMENT( CHECKSUM_IS .EQ. CHECKSUM$CHECKSUM, ",", "failed!!,passed." ) $ RETURN $! $START: $ FILE_IS = "CALLVMS.MAR" $ CHECKSUM_IS = 1954109594 $ COPY SYS$INPUT VMS_SHARE_DUMMY.DUMMY X; X; This routine is used to make a call of a system service or RTL routine, X; followed by a check on the status code returned. If this indicates X; trouble, the error is signalled. X; X; Example: the following code X; X;`009INTEGER SYS$ASSIGN, TTCHAN X;`009... X;`009ISTAT = SYS$ASSIGN( 'TT:', TTCHAN, , ) X;`009IF( .NOT.ISTAT) CALL LIB$SIGNAL( %VAL( ISTAT)) X; X; can be replaced by X; X;`009EXTERNAL SYS$ASSIGN X;`009INTEGER TTCHAN X; X;`009CALL CALLVMS( SYS$ASSIGN, 'TT:', TTCHAN, , ) X; `009 X; The first argument must be declared EXTERNAL (or the non-FORTRAN equivalent V; in other languages). THe other arguments can be of any type and use whateve Xr X; passing mechanisn is required by the first argument. X; X; If CALLVMS is used as a function, it returns any non-error status returned X; by the called routine. X; X`009.TITLE CALLVMS X`009.IDENT /V01/ X`009.PSECT`009CODE`009RD,NOWRT,EXE X X`009.ENTRY`009CALLVMS, `094M<> X; X; first part: copy args N down to 2 onto the stack. It's tempting just to V; zap the first argument and restore it afterwards, but it is not inconcievab Xle X; that an argument list is in a read-only PSECT. X; X`009MOVZBL`009(AP),R1`009`009`009; get argument count X`009MOVAL`0094(AP)`091R1`093,R0`009`009; base address of last argument X`009`009`009`009`009; plus 4 (is pre-decremented in loop) X`009DECL`009R1`009`009`009; decrement X`009BEQL`00910$`009`009`009; nothing to copy? X X5$:`009MOVL`009-(R0),-(SP)`009`009;copy args to stack X`009SOBGTR`009R1,5$ X X`009SUBB3`009#1,(AP),R1`009`009;retrieve argcount-1 X10$:`009CALLS`009R1,@4(AP)`009`009;call user routine X`009BLBS`009R0,90$`009`009`009;OK? X X`009PUSHL`009R0`009`009`009; NO, signal problem X`009CALLS`009#1,G`094LIB$SIGNAL X X90$:`009RET X`009.END $ GOSUB UNPACK_FILE $ FILE_IS = "CALLVMSTEST.FOR" $ CHECKSUM_IS = 458061297 $ COPY SYS$INPUT VMS_SHARE_DUMMY.DUMMY X`009EXTERNAL SYS$ASSIGN, TEST4 X X`009CALL CALLVMS( TEST4, 1, 2, '3', '4') X X`009WRITE(6,*) 'Should be OK' X`009CALL CALLVMS (SYS$ASSIGN, 'TT:', TTCHAN ,,) X X`009WRITE(6,*) 'Should be no-such-device' X`009CALL CALLVMS( SYS$ASSIGN, 'XXX', XXCHAN ,,) X X`009WRITE(6,*) 'Should be insfarg' X`009CALL CALLVMS( SYS$ASSIGN, 'TT:', TTT) X X`009STOP X`009END X X`009INTEGER FUNCTION TEST4( I,J,C,CC) X`009CHARACTER *(*) C,CC X X`009WRITE(6,*) 'TEST4 entered OK' X`009WRITE(6,*) I,J,C,CC X X`009TEST4 = 1 X`009RETURN X`009END $ GOSUB UNPACK_FILE $ EXIT