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 %TITLE 'LDIVISION - divide line number by 10**(0-14)'
MODULE LDIVISION (				! Pseudo division by 10**(0-14)
		IDENT = '1-003'			! File: LDIVISION.BLI Edit: GB1003
		) =
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 replaces all division in EDT.  it determines the highest
!	power of ten (from 10**0 to 10**14) which can be divided into a line
!	number.
!
! ENVIRONMENT:	Runs at any access mode - AST reentrant
!
! AUTHOR: Sharon M. Burlingame, CREATION DATE: February 11, 1982
!
! MODIFIED BY:
!
! 1-001	- Original.  SMB 11-FEB-1982
! 1-002 - Minor modifications due to code review input.  SMB 24-May-1982
! 1-003 - Start of modifications for Tops10/20. GB December 1982
!	  Remove moveline macro and add code to copy line no.
!--

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

REQUIRE 'EDTSRC:TRAROUNAM';

FORWARD ROUTINE
    EDT$$LDIV : NOVALUE;			! Divide a line number by 10**(0-14)

!
! INCLUDE FILES:
!

REQUIRE 'EDTSRC:EDTREQ';

!
! MACROS:
!
!	NONE
!
! EQUATED SYMBOLS:
!
!	NONE
!
! OWN STORAGE:
!
!	NONE
!
! EXTERNAL REFERENCES:
!
!	In the routine
%SBTTL 'EDT$$LDIV  - divide line number by 10**(0-14)'

GLOBAL ROUTINE EDT$$LDIV (			! Divide line number by 10**(0-14)
    NUMBER, 					! The line number
    D, 						! Number of times divisible
    I						! Power of ten to divide by
    ) : NOVALUE =

!++
! FUNCTIONAL DESCRIPTION:
!
!	This routine performs division by repeated comparisons and
!	subtractions.  It determines how many times a line number
!	is divisible by a power of ten and returns a digit from 0-9.
!
! FORMAL PARAMETERS:
!
!	NUMBER			input/output parameter - line number to be divided
!
!	D			output parameter - digit to be returned = number of times
!				a power of ten divided the line number
!
!	I			input parameter - power of ten to divide by
!
! IMPLICIT INPUTS:
!
!	LNO0
!
! IMPLICIT OUTPUTS:
!
!	NONE
!
! ROUTINE VALUE:
!
!	NONE
!
! SIDE EFFECTS:
!
! 	The value in NUMBER is decreased by D * 10**(I)
!
!--

    BEGIN

    EXTERNAL ROUTINE
	EDT$$CMP_LNO;

    EXTERNAL
	LNO0 : LNOVECTOR [14];

    MAP
	NUMBER : REF LN_BLOCK;

    LOCAL
	DIGIT,
	LINNO : LN_BLOCK;

!+
! Fetch the line number into a local
!-
    LINNO [LN_LO] = .NUMBER [LN_LO];
    LINNO [LN_MD] = .NUMBER [LN_MD];
    LINNO [LN_HI] = .NUMBER [LN_HI];
!+
! Determine how many times this power of ten will divide the line number
!-
    DIGIT = 0;

    WHILE (EDT$$CMP_LNO (LINNO, LNO0 [.I]) GEQ 0) DO
!+
! We've found the correct power of ten
! Find the digit corresponding to this power of ten
!-
	BEGIN
	SUBLINE (LNO0 [.I], LINNO, LINNO);
	DIGIT = .DIGIT + 1;
	END;

!+
! Transfer the digit and new line number to return parameters
!-
    .D = .DIGIT;
    NUMBER [LN_LO] = .LINNO [LN_LO];
    NUMBER [LN_MD] = .LINNO [LN_MD];
    NUMBER [LN_HI] = .LINNO [LN_HI];
    END;


END
ELUDOM