Type ASSEMBLE
Source Lines : 189
Fixes Applied : 0
Most Recent Version : Tuesday, December 12, 1978
Last Fix ID : [Unmodified]
Module
DMSPNT (POINT)
Function
TO PLACE A FILE STATUS TABLE ENTRY IN THE ACTIVE FILE
TABLE (IF NECESSARY), AND TO SET THE READ POINTER
AND/OR WRITE POINTER FOR THAT FILE TO A GIVEN ITEM
NUMBER.
Attributes
NUCLEUS RESIDENT, REENTRANT
Operation
DMSPNT CHECKS FOR POSSIBLE PARAMETER LIST ERRORS
AND EXITS WITH ERROR 2 IF PARAMETER LIST IF FAULTY.
IF NOT, DMSPNT CALLS DMSLAF TO DETERMINE IF THE FST
ENTRY FOR THE GIVEN FILE
IS ALREADY IN THE ACTIVE FILE TABLE. IF YES, THE
READ AND/OR WRITE POINTERS ARE SET AS DESCRIBED
BELOW.
IF NOT FOUND BY DMSLAF, THEN DMSPNT CALLS DMSLFS TO
FIND THE FILE. IF IT IS NOT FOUND, ERROR 1 IS
RETURNED TO THE CALLER. IF FOUND, THEN DMSLAFFE IS
CALLED TO
PLACE THE GIVEN FILE IN THE ACTIVE FILE TABLE.
DMSPNT THEN CHECKS THE READ POINTER PROVIDED BY THE
CALLER; IF IT IS
ZERO, NO ACTION IS TAKEN. BUT IF NONZERO, THEN ITS
VALUE IS STORED IN THE READ POINTER (AFTRP) IN THE
ACTIVE FILE TABLE.
NEXT, DMSPNT CHECKS THE WRITE POINTER PROVIDED BY THE
CALLER; IF IT IS ZERO
NO ACTION IS TAKEN. IF THE WRITE POINTER IS A
HALFWORD OF ALL ONES (THAT IS,=65535), THEN THE WRITE
POINTER AFTWP IS SET TO THE NUMBER OF ITEMS (AFTIC)
PLUS ONE. IF THE WRITE POINTER IS NEITHER 0 NOR
65535, THEN ITS VALUE IS STORED IN THE WRITE POINTER
(AFTWP) IN THE ACTIVE FILE TABLE.
WHEN THROUGH, POINT RETURNS TO THE CALLER AS SHOWN IN
THE EXIT CONDITIONS ABOVE.
Calls to Other Routines
DMSLAFFE, DMSLAF, DMSLFS