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 %TITLE 'CHMINSCHR - insert a string of characters'
MODULE CHMINSCHR (				! Insert a string of characters
		IDENT = '3-002'			! File: CHMINSCHR.BLI Edit: GB3002
		) =
BEGIN
!
!			  COPYRIGHT (c) 1981, 1985 BY
!	      DIGITAL EQUIPMENT CORPORATION, MAYNARD, MASS.
!		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 WHICH IS NOT SUPPLIED BY DIGITAL.
!

!++
! FACILITY:	EDT -- The DEC Standard Editor
!
! ABSTRACT:
!
!	This module does a (change mode) insertion of a string of
!	characters at the current position in the text.
!
! 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 INSERT_CHARS from the module CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 02-Mar-1981
! 1-003	- Change SPLIT_LINE to EDT$$SPLT_LNINS .  JBS 30-Mar-1981
! 1-004	- Fix up some comments.  JBS 02-Jun-1981
! 1-005	- Use new message codes.  JBS 04-Aug-1981
! 1-006	- New screen update logic.  JBS 13-Sep-1982
! 1-007 - Replace call to edt$$tst_eob. STS 22-Sep-1982
! 1-008 - Add a parameter to the split line routine.  SMB 16-Nov-1982
! 1-009 - Change the parameter to split line routine.  SMB 17-Nov-1982
! 1-010	- Change the call to EDT$$MRK_LNCHG.  JBS 27-Dec-1982
! 3-001 - Change CPY_MEM to CPY_STR.  GB 1-Mar-1983
! 3-002 - Add updates from V3 source kit.  GB 27-Apr-1983
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$INS_STR;				! Insert a string of characters at the current position

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$INS_STR  - insert a string of characters'

GLOBAL ROUTINE EDT$$INS_STR (			! Insert a string of characters
	S, 					! Address of string to insert
	L					! Length of string to insert
    ) =

!++
! FUNCTIONAL DESCRIPTION:
!
!	Insert a string of characters at the current position in the text.
!
! FORMAL PARAMETERS:
!
!  S 			a pointer to the string
!  L 			the length of the string
!
! IMPLICIT INPUTS:
!
!	SEL_POS
!	LN_END
!	LN_LEN
!	LN_PTR
!	LN_BUF
!
! IMPLICIT OUTPUTS:
!
!	SEL_POS
!	LN_PTR
!
! ROUTINE VALUE:
!
!	1 = success, 0 = error (line overflow)
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$MSG_BELL : NOVALUE,		! Output a message to the terminal with a warning bell
	EDT$$MRK_LNCHG : NOVALUE,		! Track line update
	EDT$$CS_UP,				! Move up a line
	EDT$$UPD_LNLEN : NOVALUE,		! Update the length of the current line
	EDT$$SEL_RNGPOS,			! Compare the select line with the current line
	EDT$$SPLT_LNINS : NOVALUE;		! Split a line of text at the current cursor position
    EXTERNAL
	SEL_POS,				! select position.
	LN_END,				! End of current line pointer
	LN_LEN,				! Length of current line
	WK_LN : REF LIN_BLOCK,
	EOB_LN,
	LN_PTR,				! Current character pointer
	LN_BUF;				! Line buffer

    MESSAGES ((LINEXC255));
!+
! First make sure the line will not overflow.
!-

    IF (.LN_LEN + .L GTRU 255)
    THEN
	BEGIN
	EDT$$MSG_BELL (EDT$_LINEXC255);
	RETURN (0);
	END
    ELSE
	BEGIN

	LOCAL
	    OLD_LPOINT;

!+
! Check for the old EOB.
!-

	IF (.WK_LN EQLA EOB_LN)
	THEN
	    BEGIN
	    EDT$$SPLT_LNINS (0);	!Dont use optimizer
	    EDT$$CS_UP ();
	    END;

!+
! Compute the new cursor position.
!-
	OLD_LPOINT = .LN_PTR;
	LN_PTR = CH$PLUS (.LN_PTR, .L);
!+
! Open up a hole for the new characters.
!-
	EDT$$CPY_STR (CH$DIFF (.LN_END, .OLD_LPOINT), .OLD_LPOINT, .LN_PTR);
!+
! And move the new one(s) in.
!-
	EDT$$CPY_STR (.L, .S, .OLD_LPOINT);
!+
! Update the length of the line.
!-
	EDT$$UPD_LNLEN (.L);
!+
! Record the insertion for the screen updater.
!-
	EDT$$MRK_LNCHG (SCR_EDIT_MODIFY, CH$DIFF (.OLD_LPOINT,
					 	CH$PTR (LN_BUF,, BYTE_SIZE)));
!+
! Update select ranges if necessary.
!-

	IF (EDT$$SEL_RNGPOS () EQL 0)
	THEN
!+
! The current line is the select line.
!-

	    IF CH$PTR_LSS (.OLD_LPOINT, .SEL_POS) THEN SEL_POS = CH$PLUS (.SEL_POS, .L);

	RETURN (1);
	END;

    END;


END
ELUDOM