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bb-r775e-bm_tops20_ks_upd_5
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sources/edt/tichar.bli
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%TITLE 'TICHAR - input a character'
MODULE TICHAR ( ! Input a character
IDENT = '3-003' ! File: TICHAR.BLI Edit: CJG3003
) =
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:
!
! Input a character.
!
! ENVIRONMENT: Runs at any access mode - AST reentrant
!
! AUTHOR: Bob Kushlis, CREATION DATE: June 9, 1979
!
! MODIFIED BY:
!
! 1-001 - Original. DJS 18-FEB-1981. This module was created by
! extracting routine EDT$$TI_INPCH from module TINPUT.
! 1-002 - Regularize headers. JBS 10-Mar-1981
! 1-003 - Revise journaling. JBS 22-Jun-1981
! 1-004 - Fix reading journal file. JBS 08-Jul-1981
! 1-005 - Don't flush the journal record in the middle of an escape sequence.
! JBS 08-Jul-1981
! 1-006 - Return 0 if the journal file ends. JBS 01-Oct-1981
! 1-007 - Use the global prompt string, if specified. JBS 21-Oct-1981
! 1-008 - Remove length of prompt string. JBS 23-Oct-1981
! 1-009 - Revise autorepeat logic, putting it in a subroutine. JBS 30-Jan-1982
! 1-010 - Flush the terminal buffer after turning off Autorepeat.
! JBS 31-Jan-1982
! 1-011 - Add JOU_VALID. JBS 09-Apr-1982
! 1-012 - Allow for 8-bit keyboards. JBS 17-Aug-1982
! 1-013 - Add SS3 for 8-bit keyboards. JBS 20-Aug-1982
! 1-014 - Revise read-ahead logic. JBS 02-Sep-1982
! 1-015 - Don't write out to the journal file here. 07-Oct-1982
! 1-016 - Add VT220 support conditional. JBS 11-Feb-1983
! 3-001 - Make argument to FLUSHJOUFI %C. GB 08-Mar-1983
! 3-002 - Remove VT220 conditional to speed up code. CJG 25-Nov-1983
! 3-003 - Check for VT52 and clear parity bit if it is a VT52. CJG 26-Jan-84
!--
%SBTTL 'Declarations'
!
! TABLE OF CONTENTS:
!
REQUIRE 'EDTSRC:TRAROUNAM';
FORWARD ROUTINE
EDT$$TI_INPCH;
!
! INCLUDE FILES:
!
REQUIRE 'EDTSRC:EDTREQ';
LIBRARY 'EDTSRC:TRANSLATE';
!
! MACROS:
!
! NONE
!
! EQUATED SYMBOLS:
!
! NONE
!
! OWN STORAGE:
!
! NONE
!
! EXTERNAL REFERENCES:
!
! In the routine
%SBTTL 'EDT$$TI_INPCH - input a character'
GLOBAL ROUTINE EDT$$TI_INPCH ( ! Input a character
BUF ! Where to store character
) =
!++
! FUNCTIONAL DESCRIPTION:
!
! This routine gets the next character from input. If recovery mode is on
! then the character is read from the journal file. If not, then we check
! to see if the character was read previously, and take it from the type-
! ahead character; otherwise, we read a chraracter from the terminal. If the
! character is not coming from the journal file, it is written to it.
!
! FORMAL PARAMETERS:
!
! BUF the address of a fullword in which the character is returned.
!
! IMPLICIT INPUTS:
!
! RCOV_MOD
! K_AUTRPT
! TIN_IRECEND
! RDAHEDBF
! RDAHED
! TIN_INREC
! TIN_IBUFPTR
! PMT_KPD
! PMT_NOKPD
! KPAD
!
! IMPLICIT OUTPUTS:
!
! TIN_IRECLEN
! RDAHED
! TIN_IBUFPTR
! JOU_VALID
!
! ROUTINE VALUE:
!
! 1 = got a character, 0 = end of journal file
!
! SIDE EFFECTS:
!
! May turn off auto-repeat.
!
!--
BEGIN
EXTERNAL ROUTINE
EDT$$RD_JOUTXT, ! Read a text record from the journal file
EDT$$OUT_FMTBUF,
EDT$$FMT_LIT,
EDT$$TI_GETCH,
EDT$$TI_BUFCH : NOVALUE,
EDT$$TI_ENBLAUTREP : NOVALUE; ! Enable and disable autorepeat
EXTERNAL
RCOV_MOD, ! Recovery mode flag
K_AUTRPT, ! Auto repeat flag
RDAHED, ! Type ahead counter
RDAHEDBF, ! Type ahead buffer
TIN_IBUFPTR : REF VECTOR, ! Pointer into journal input buffer
TIN_IRECLEN, ! Length of journal input record
TIN_INREC, ! Journal input record buffer
TIN_IRECEND, ! Pointer to end of journal input buffer
PMT_KPD : VECTOR, ! Counted ASCII string for keypad mode prompt
PMT_NOKPD : VECTOR, ! Counted ASCII string for nokeypad mode prompt
KPAD, ! 1 = keypad change mode, 0 = nokeypad change mode
TI_TYPE, ! Terminal type
JOU_VALID, ! 1 = journal record is valid
CHAR_INFO : BLOCKVECTOR [256, 1]; ! Information about characters
!+
! Check for recovery mode.
!-
IF .RCOV_MOD
THEN
BEGIN
!+
! Make sure we have a character in the buffer.
!-
WHILE (CH$PTR_EQL (.TIN_IBUFPTR, .TIN_IRECEND) OR (.TIN_IBUFPTR EQL 0)) DO
BEGIN
!+
! No characters left, try to read a new record from the journal
! file.
!+
IF EDT$$RD_JOUTXT (TIN_INREC, TIN_IRECLEN)
THEN
BEGIN
TIN_IRECEND = CH$PTR (TIN_INREC, .TIN_IRECLEN, BYTE_SIZE);
TIN_IBUFPTR = CH$PTR (TIN_INREC, 0, BYTE_SIZE);
END
ELSE
!+
! No more records in the journal file, arrange to return to the root.
!-
RETURN (0);
END;
!+
! Return next character from the journal buffer.
!-
.BUF = CH$RCHAR_A (TIN_IBUFPTR);
END
ELSE
!+
! Not in recovery mode, check for type ahead.
!-
BEGIN
!+
! If there are any characters in the type-ahead buffer, use the first.
! Otherwise block waiting for the user to type something.
!-
IF (.RDAHED GTR 0)
THEN
BEGIN
!+
! Return the oldest typed ahead character, and shuffle the buffer.
!-
RDAHED = .RDAHED - 1;
.BUF = CH$RCHAR (CH$PTR (RDAHEDBF,, BYTE_SIZE));
IF (.RDAHED GTR 0) !
THEN
CH$MOVE (.RDAHED, CH$PTR (RDAHEDBF, 1, BYTE_SIZE),
CH$PTR (RDAHEDBF, 0, BYTE_SIZE));
END
ELSE
BEGIN
!+
! Read the character from the terminal. Prompt first if requested.
!-
LOCAL
PROMPT_ADDR : REF VECTOR [8];
PROMPT_ADDR = (IF .KPAD THEN PMT_KPD ELSE PMT_NOKPD);
IF (.PROMPT_ADDR [0] GTR 0)
THEN
BEGIN
EDT$$FMT_LIT (CH$PTR (PROMPT_ADDR [1],, BYTE_SIZE), .PROMPT_ADDR [0]);
EDT$$OUT_FMTBUF ();
END;
EDT$$TI_GETCH (.BUF);
END;
!+
! Make sure the character is journaled.
!-
IF (.TI_TYPE EQL TERM_VT52) THEN .BUF = ..BUF AND %O'177';
EDT$$TI_BUFCH (..BUF);
JOU_VALID = 1;
!+
! If the character was an escape, CSI or SS3, turn auto-repeat off.
! This also disables dumping the journal buffer, so that a
! journal record can contain an entire escape or control sequence.
!-
IF .CHAR_INFO [..BUF, CI_ESC]
THEN
BEGIN
EDT$$TI_ENBLAUTREP (0);
EDT$$OUT_FMTBUF ();
END;
END;
RETURN (1);
END; ! of routine EDT$$TI_INPCH
END
ELUDOM