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tops20-v7-ft-dist1-clock
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7-sources/ufbuffer.bli
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%TITLE 'UFBUFFER - find a buffer'
MODULE UFBUFFER ( ! Find a buffer
IDENT = '1-004' ! File: UFBUFFER.BLI Edit: STS1004
) =
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:
!
! Find a buffer, given its name. A buffer is created if necessary.
!
! ENVIRONMENT: Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: February 7, 1978
!
! MODIFIED BY:
!
! 1-001 - Original. DJS 19-FEB-1981. This module was created by
! extracting routine EDT$$FND_BUF from module UTIL.
! 1-002 - Regularized headers. JBS 25-Feb-1981
! 1-003 - Fix module name. JBS 11-Mar-1981
! 1-004 - Initialize more of the tbcb. STS 10-Mar-1982
!--
%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!
REQUIRE 'EDTSRC:TRAROUNAM';
FORWARD ROUTINE
EDT$$FND_BUF;
!
! INCLUDE FILES:
!
REQUIRE 'EDTSRC:EDTREQ';
!
! MACROS:
!
! NONE
!
! EQUATED SYMBOLS:
!
! NONE
!
! OWN STORAGE:
!
! NONE
!
! EXTERNAL REFERENCES:
!
! In the routine
%SBTTL 'EDT$$FND_BUF - find a buffer'
GLOBAL ROUTINE EDT$$FND_BUF ( ! Find a buffer
NAME, ! pointer to the buffer name
LEN ! length of that name
) =
!++
! FUNCTIONAL DESCRIPTION:
!
! This routine searches for a buffer with a specified name and positions
! into it. If a buffer by that name does not exist, then it is created.
! The global variable PRV_BUF is set to point to the TBCB
! of the buffer we were originally positioned in.
!
! FORMAL PARAMETERS:
!
! NAME Pointer to a string containing the name of the buffer.
!
! LEN Length of the name string.
!
! IMPLICIT INPUTS:
!
! CUR_BUF
!
! IMPLICIT OUTPUTS:
!
! CUR_BUF
! PRV_BUF
!
! ROUTINE VALUE
!
! Returns 1 if the buffer was found or created, 0 if an attempt to create a
! new buffer failed.
!
! SIDE EFFECTS:
!
! May create a new buffer.
!
!--
BEGIN
EXTERNAL ROUTINE
EDT$$GET_BUFPTR,
EDT$$NEW_BUF;
EXTERNAL
LNO_ZERO : LN_BLOCK,
CUR_BUF : REF TBCB_BLOCK, ! Pointer to current buffer TBCB
PRV_BUF : REF TBCB_BLOCK; ! Pointer to previous buffer TBCB
LOCAL
BUF_ADDR : REF TBCB_BLOCK,
NEW;
!+
! Look for the buffer.
!-
IF EDT$$GET_BUFPTR (.NAME, .LEN, BUF_ADDR, NEW)
THEN
BEGIN
!+
! Position to the new buffer.
!-
PRV_BUF = .CUR_BUF;
CUR_BUF = .BUF_ADDR;
!+
! If the buffer was new, then open it up.
!-
IF (.NEW NEQ 0) THEN
BEGIN
BUF_ADDR[TBCB_INPUT_RAB] = 0;
BUF_ADDR [TBCB_LINE_COUNT] = .LNO_ZERO [LN_LO];
BUF_ADDR [TBCB_LC_M] = .LNO_ZERO [LN_MD];
BUF_ADDR [TBCB_LC_H] = .LNO_ZERO [LN_HI];
EDT$$NEW_BUF ();
END;
RETURN (1);
END
ELSE
RETURN (0);
END;
END
ELUDOM