Type ASSEMBLE
Source Lines : 708
Fixes Applied : 4
Most Recent Version : Tuesday, December 12, 1978
Last Fix ID : [HRC073DS]
Module
DMSSCR
Function
LOAD DISPLAY BUFFERS AND CREATE A PARAMETER LIST FOR
MODULE DMSGIO.
Attributes
EXECUTES IN USER AREA AS PART OF EDIT LOAD MODULE.
Operation
UPON ENTRY TO THIS ROUTINE THE TWO BYTES LABELLED
SCRFLGS, AND SCRFLG2 WILL BE SET TO INDICATE THE
FOLLOWING:
SCRFLGS= X'80' REWRITE THE STATUS AREA
SCRFLGS= X'40' WRITE THE CURRENT LINE TO LINE 9 OF ALL DISPLAYS
EXCEPT 3278 MOD 2A WHICH IS LINE 7
SCRFLGS= X'20' WRITE FROM THE CURRENT LINE DOWN TO THE
BOTTOM OF THE OUTPUT AREA.
SCRFLGS= X'02' WRITE FROM CURRENT LINE UP TO TOP
SCRFLG2= X'80' CAUSE CP MORE STATUS. ISSUED WITH A
COMPLETE WRITE REQUEST.
SCRFLG2= X'40' CAUSE AN EFFECTIVE OPERATOR CANCEL.
SCAFLG2= X'04' WRITE LAST COMMAND TO INPUT AREA
DMSSCR USES THE FLAG BITS TO LOAD A DISPLAY BUFFER
AREA WHICH IS LOCATED IN USER FREE STORAGE. THIS AREA
WAS OBTAINED BY DMSEDX DURING INITIALIZATION.
FILEID INFORMATION IS OBTAINED FROM CONTROL BLOCKS
IN DMSEDI. EDITOR STATUS IS DETERMINED BY FLAG BITS
IN DMSEDI INDICATING 'NEW FILE','EDIT MODE',OR
'INPUT MODE'.
THE LENGTH AND ADDRESS OF A MESSAGE TO BE WRITTEN
ARE LOCATED IN REGISTERS 0 AND 1 RESPECTIVELY AT
ENTRY TO THIS MODULE.
THE TRUNCATION COLUMN IS USED TO DETERMINE THE
LENGTH OF THE CURRENT LINE TO BE PLACED IN THE INPUT
AREA BUFFER. IN THE CASE OF A DISPLAY CHANGE COMMAND
WITH LINEMODE IN EFFECT, THE LINE NUMBER IS NOT
WRITTEN IN THE INPUT AREA WITH THE REST OF THE DATA.
IT IS THEREBY PROTECTED FROM ALTERATION BY THE USER.
LOADING OUTPUT AREA BUFFERS
THE OUTPUT BUFFERS ARE ALWAYS LOADED SO THAT LINE 9
OF THE DISPLAY ALWAYS CONTAINS THE CURRENT LINE UNLESS
IT IS A 3278 MOD 2A THEN IT IS LINE 7. IF
THE VERIFICATION COLUMN IS GREATER THAN 80, TWO LINES
MAY BE USED TO DISPLAY THE RECORD.
TRAILING BLANKS IN A RECORD ARE IGNORED IN DETERMIN-
ING WHETHER OR NOT A RECORD WILL REQUIRE TWO DISPLAY
LINES.
THE CURRENT LINE IS THE FIRST TO BE LOADED INTO THE
BUFFER AREA.
ENOUGH RECORDS FOLLOWING THE CURRENT LINE TO FILL
THE REMAINING LOWER OUTPUT BUFFER AREA ARE THEN
LOADED.
THEN THE LINES PRECEDING THE CURRENT LINE ARE
LOADED IN REVERSE ORDER, THAT IS, LINE 8, LINE 7, ETC,
THROUGH LINE 2.
IN THE CASE OF TOP OF FILE OR END OF FILE BEING
ENCOUNTEREDIN LOADING THE BUFFER AREA, THE REMAINING
BUFFER LINES IN THE OUTPUT AREA ARE PADDED WITH
BLANKS.
WHEN THE REQUESTED BUFFERS HAVE BEEN LOADED A
PARAMETER LIST IS GENERATED USING THE UPPER AND LOWER
LIMITS OF THE WRITE REQUEST TO CALCULATE THE NUMBER
OF BYTES TO BE WRITTEN. A CALL IS MADE TO DMSGIO FOR
ISSUANCE OF THE CP DIAGNOSE TO WRITE TO THE DISPLAY.
UPON RETURN FROM DMSGIO, DMSSCR RETURNS TO THE CALLER
WITH CP'S DIAGNOSE RETURN CODE IN REGISTER 15.
Calls to Other Routines
DMSGIO