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 %TITLE 'CHMGBUF - look for a buffer name'
MODULE CHMGBUF (				! Look for a buffer name
		IDENT = '3-003'			! File: CHMGBUF.BLI Edit: GB3003
		) =
BEGIN
!COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1981, 1988.  ALL RIGHTS RESERVED.
!
!THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED ONLY
!IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND 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.  NO TITLE
!TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY TRANSFERRED.
!
!THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE AND 
!SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT CORPORATION.
!
!DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS 
!SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
!
!
!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	This module scans the command buffer for a buffer name.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: Unknown
!
! MODIFIED BY:
!
! 1-001	- Original.  DJS 04-Feb-1981.  This module was created by
!	extracting the routine EDT$$GET_BUF  from the module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 02-Mar-1981
! 1-003	- Use new message codes.  JBS 04-Aug-1981
! 1-004 - Check first to see if there are more characters on command line. 
!	    STS 21-Jun-1982
! 1-005	- Change alphabetic test.  JBS 19-Jul-1982
! 1-006	- Add conditional for VT220 support.  JBS 11-Feb-1983
! 3-001 - Change lots of occurences of CMD_BUF to CMD_PTR.  GB 07-Apr-1983
! 3-002 - Add updates from V3 source kit.  GB 27-Apr-1983
! 3-003 - Remove VT220 conditional to speed up code. CJG 25-Nov-1983
!--

%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$GET_BUF : NOVALUE;	! Look for a buffer specification for the cut, paste, and append commands

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

LIBRARY 'EDTSRC:TRANSLATE';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$GET_BUF  - look for a buffer name'

GLOBAL ROUTINE EDT$$GET_BUF 			! Look for a buffer name
    : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine looks for a buffer spec for use by cut paste and append.
!	If an '=' is seen, an explicit buffer spec is there, otherwise, use
!	the paste buffer.  The routine places the address of the buffer in
!	ALT_BUF , with a zero indicating failure.
!
! FORMAL PARAMETERS:
!
!	NONE
!
! IMPLICIT INPUTS:
!
!	CMD_END
!	CMD_PTR
!	PST_BUF
!	CUR_BUF
!
! IMPLICIT OUTPUTS:
!
!	ALT_BUF
!	CMD_PTR
!
! ROUTINE VALUE:
!
!	1 = buffer spec seen, 0 = no buffer spec seen
!
! SIDE EFFECTS:
!
!	Uses EDT$$FND_BUF  to create the buffer if necessary.  If it fails,
!	gives an error message.
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$MSG_BELL : NOVALUE,		! Output a message to the terminal with a warning bell
	EDT$$CNV_UPC,				! Convert string to upper case
	EDT$$FND_BUF,				! Search for a text buffer
	EDT$$RD_CURLN;				! Get the current line

    EXTERNAL
	CMD_END,				! End of command pointer
	CMD_PTR,				! Command string pointer
	ALT_BUF : REF TBCB_BLOCK,		! Alternate buffer used for cut/paste.
	PST_BUF : REF TBCB_BLOCK,		! The paste buffer tbcb
	CUR_BUF : REF TBCB_BLOCK,		! The current buffer tbcb
	CHAR_INFO : BLOCKVECTOR [256, 1];	! Information about characters

    MESSAGES ((INVBUFNAM, INSMEM));

    LOCAL
	SAVE_TBCB,
	NEW,
	NAME_LEN,
	NAME_START,
	CHAR;

    NAME_LEN = 0;
    CHAR = CH$RCHAR (.CMD_PTR);

    IF (.CHAR EQL %C'=') AND CH$PTR_LSS (.CMD_PTR, .CMD_END)
    THEN
	BEGIN
	CMD_PTR = CH$PLUS (.CMD_PTR, 1);
	NAME_START = .CMD_PTR;

	WHILE CH$PTR_LSS (.CMD_PTR, .CMD_END) DO
	    BEGIN

	    CHAR = CH$RCHAR (.CMD_PTR);

	    IF (NOT .CHAR_INFO [.CHAR, CI_LET]		! Not alphabetic
		AND NOT .CHAR_INFO [.CHAR, CI_DIG]	! Not numeric
		AND (.CHAR NEQ %C'_'))			! Not an underscore
	    THEN
		EXITLOOP;

	    NAME_LEN = .NAME_LEN + 1;
	    CMD_PTR = CH$PLUS (.CMD_PTR, 1);
	    END;

	CHAR = CH$RCHAR (.NAME_START);

	IF ((.NAME_LEN EQL 0) OR NOT .CHAR_INFO [.CHAR, CI_LET])
	THEN
		BEGIN
		EDT$$MSG_BELL (EDT$_INVBUFNAM);
		RETURN;
		END;

	EDT$$CNV_UPC (.NAME_START, .NAME_LEN);
	SAVE_TBCB = .CUR_BUF;

	IF EDT$$FND_BUF (.NAME_START, .NAME_LEN)
	THEN
	    ALT_BUF = .CUR_BUF
	ELSE
	    EDT$$MSG_BELL (EDT$_INSMEM);

	CUR_BUF = .SAVE_TBCB;
	EDT$$RD_CURLN ();
	END
    ELSE
	ALT_BUF = .PST_BUF;

    END;					! of routine EDT$$GET_BUF

END						! of module EDT$CHMGBUF
ELUDOM