Type ASSEMBLE
Source Lines : 1,184
Fixes Applied : 6
Most Recent Version : Tuesday, December 12, 1978
Last Fix ID : [HRC073DS]

Module

      DMSEDX

Function

      PERFORMS INITIALIZATION FOR THE CMS EDITOR.

Attributes

      EXECUTES IN TRANSIENT AREA. REUSEABLE.

Operation

      DMSEDX LOADED INTO THE TRANSIENT AREA OF VIRTUAL
      MACHINE STORAGE AND EXECUTED AS A RESULT OF THE CMS
      EDIT COMMAND BEING ISSUED. DMSEDX FIRST ATTEMPTS
      TO LOAD A SAVED SYSTEM WITH THE NAME AT THE ENTRY
      FOR 'SHREXEC' IN THE CMS NUCLEUS SAVED SYSTEM NAME
      TABLE ''SYSNAMES''. IF THE NAME PROVIDED IS NOT
      VALID, AN ATTEMPT IS MADE TO LOADMOD A DMSEXT MODULE
      USING THE USER'S ACCESSED DISKS.
      DMSEDX NOW ISSUES A DMSFREE FOR ALL BUT 15K OF
      VIRTUAL MACHINE STORAGE. THE FIRST PART OF THIS
      FREE STORAGE IS CLEARED TO X'0' AND ALLOCATED TO
      TE EDCB (EDIT CONTROL BLOCK) WHICH IS USED BY ALL
      EDIT ROUTINES. THE EDCB CONTAINS ALL NECESSARY
      ASSIGNMENTS TO ALLOW THE CMS EDITOR TO BE REENTRANT
      AND THEREFORE BE ALLOWED TO BE LOADED INTO A VM/370
      SHARED SEGMENT.
      DMSEDX THEN INITIALIZES EDCB WITH ALL NECESSARY
      PLIST, ETC. REQUIRED BY EDIT ROUTINES.

      DMSEDX SCANS THE EDIT COMMAND LINE FOR VALIDITY.

      IF A REMOTE 3270 TERMINAL IS IN USE IT IS FORCED TO
      OPERATE IN 2741 OR TYPEWRITE MODE TO CUT DOWN ON THE
      AMOUNT OF DATA TRANSMITTED. THIS MODE CAN BE
      OVERRIDDEN BY THE FORMAT SUBCOMMAND.

      IF THE NODISP OPTION WAS SPECIFIED IN THE EDIT
      COMMAND A 3270 TYPE TERMINAL IS FORCED TO OPERATE IN
      2741 MODE FOR THE DURATION OF THE EDIT SESSION. NO
      OVERRIDE IS ALLOWED.

      IF THE FILE IS FOUND ON DISK BY THE CALL TO
      DMSSTT, THE FILE IS READ FROM
      DISK BY DMSBRD AND THE FILE PLACE IN THE EDIT FREE
      STORAGE AREA WITH APPROPRIATE LINE POINTERS INCLUDED
      IN EACH RECORD.
      IF THE FILE IS NOT FOUND ON DISK, STORAGE IS
      INITIALIZED AND A MESSAGE IS TYPED TELLING THE
      USER THE FILE IS NEW.
      AT THIS TIME THE FILE ATTRIBUTES, EXISTING,
      SPECIFIED, OR DEFAULTED, ARE MOVED TO THE PROPER
      AREA IN EDCB.

      DMSEDX THEN BRANCHES TO THE MAIN EDIT ROUTINE.

Calls to Other Routines

      DMSSTT,DMSERR,DMSEDF,DMSBRD,DMSFNS,DMSFREE,DMSFRET
      DMSKEY,DMSCWT