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 %TITLE 'CHMCHGC - change case'
MODULE CHMCHGC (				! Change case
		IDENT = '3-003'			! File: CHMCHGC.BLI Edit: CJG3003
		) =
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 executes the change mode commands
!	CHGC, CHGU, and CHGL.
!
! 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 PROCESS_CHGC from routine CHANGE.BLI.
! 1-002	- Regularize headers.  JBS 27-Feb-1981
! 1-003	- Fix module name.  JBS 02-Mar-1981
! 1-004	- Use the ASSERT macro.  JBS 01-Jun-1981
! 1-005	- Change the alphabetic test logic.  JBS 19-Jul-1982
! 1-006	- New screen update logic.  JBS 13-Sep-1982
! 1-007	- Add conditionals for WPS and VT220 support.  JBS 10-FEB-1983
! 3-001 - Add updates from V3 sources.  GB 26-Apr-1983
! 3-002 - Remove VT220 conditional to speed up code. CJG 25-Nov-1983
! 3-003 - Modify ASSERT macro to include error code. CJG 30-Jan-1984
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

LIBRARY 'EDTSRC:TRANSLATE';

FORWARD ROUTINE
    EDT$$CHG_CAS : NOVALUE;			! Process the changecase commands

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine

%SBTTL 'EDT$$CHG_CAS  - change case'

GLOBAL ROUTINE EDT$$CHG_CAS (			! Change case
		FC,				! first character
		LC				! last character
	) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This is the processing routine for the changecase commands.
!	This routine is called by the process lines command
!	for each line of the selected text.
!
! FORMAL PARAMETERS:
!
!  FC			First character position to process
!
!  LC			Last character position to process
!
! IMPLICIT INPUTS:
!
!	CAS_TYP
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
!	NONE
!
!--

    BEGIN


    EXTERNAL
	CAS_TYP,
	CHAR_INFO : BLOCKVECTOR [256, 1];	! Information about charactere

    LOCAL
	CHAR,
	CP;

    CP = .FC;

    WHILE CH$PTR_NEQ (.CP, .LC) DO
	BEGIN

	IF .CHAR_INFO [CH$RCHAR (.CP), CI_LET]		! If this is a letter
	THEN

	    CASE .CAS_TYP FROM CASE_K_CHGC TO CASE_K_CHGL OF
		SET

		[CASE_K_CHGC] :
!+
! Invert case
!-
		    CH$WCHAR (CH$RCHAR (.CP) XOR %O'40', .CP);

		[CASE_K_CHGU] :
!+
! Force to upper case
!-
		    CH$WCHAR (CH$RCHAR (.CP) AND ( NOT %O'40'), .CP);

		[CASE_K_CHGL] :
!+
! Force to lower case
!-
		    CH$WCHAR (CH$RCHAR (.CP) OR %O'40', .CP);

		[OUTRANGE] :
		    ASSERT (3, 0);
		TES;

	CP = CH$PLUS (.CP, 1);
	END;

    END;					! of routine EDT$$CHG_CAS

!<BLF/PAGE>

END						! of module EDT$CHMCHGC

ELUDOM