Type ASSEMBLE
Source Lines : 592
Fixes Applied : 0
Most Recent Version : Tuesday, December 12, 1978
Last Fix ID : [Unmodified]
Module
DMSLAF
Function
FIND THE ACTIVE FILE TABLE BLOCK WHOSE FILENAME,
FILETYPE, AND MODE MATCH THE ONE SUPPLIED BY THE
CALLER.
Attributes
NUCLEUS RESIDENT, RE-ENTRANT
Operation
IF R0=0 AT ENTRY, DMSLAF STARTS SEARCHING THE ACTIVE
FILE TABLE AT THE FIRST BLOCK (AT FVSAFT). IF
R0=NONZERO AT ENTRY, THE GIVEN VALUE IN R0 IS TAKEN
AS THE ADDRESS OF THE PRESENT AFT BLOCK, AND
SEARCHING COMMENCES WITH THE NEXT BLOCK (IF ANY).
(THIS FEATURE FACILITATES SEARCHING FOR MORE THAN ONE
MATCHING FILE BY THE CALLING FUNCTION.)
DMSLAF EXAMINES EACH BLOCK IN THE ACTIVE FILE TABLE
FOR A FILENAME, FILETYPE, AND FILEMODE
MATCHING THOSE IN THE PARAMETER LIST. IF THE GIVEN
FILENAME AND/OR FILETYPE WAS SPECIFIED AS '*' IN THE
PARAMETER LIST, A MATCHING FILENAME OR FILETYPE,
RESPECTIVELY, IS ASSUMED. IF THE MODE WAS SPECIFIED
AS EITHER '*', BINARY 0, BLANK (X'40'), OR X'FF', THE
MODE IS ASSUMED CORRECT. IF NOT, THE GIVEN MODE
LETTER MUST EQUAL THE MODE IN THE ACTIVE FILE TABLE
BLOCK FOR A MATCH. (IT IS NOT NECESSARY TO CHECK THE
MODE NUMBER.)
EXIT CONDITIONS ARE RETURNED AS SPECIFIED ABOVE, WITH
THE ADDRESS OF THE MATCHING BLOCK (IF ANY) RETURNED
IN R1. THE CONDITION-CODE IS SET PER R15, FOR
CONVENIENCE OF THE CALLER.
Calls to Other Routines
NONE