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(* ObjectFiles.mod determines whether object files exist.
Copyright (C) 2018-2024 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE ObjectFiles ;
FROM Storage IMPORT ALLOCATE, DEALLOCATE ;
FROM DynamicStrings IMPORT Dup, Mark, string ;
FROM Indexing IMPORT Index, InitIndex, KillIndex, GetIndice, PutIndice,
HighIndice, LowIndice, InBounds, IsIndiceInIndex,
RemoveIndiceFromIndex, IncludeIndiceIntoIndex,
ForeachIndiceInIndexDo ;
FROM wrapc IMPORT fileinode ;
FROM libc IMPORT open, close ;
FROM M2Printf IMPORT fprintf1, fprintf0 ;
FROM FIO IMPORT StdErr ;
FROM Assertion IMPORT Assert ;
CONST
UNIXREADONLY = 0 ;
Debugging = FALSE ;
TYPE
FileObject = POINTER TO RECORD
name : String ;
inodeLow, inodeHigh: CARDINAL ;
END ;
FileObjects = POINTER TO RECORD
objects: Index ;
END ;
(*
RegisterModuleObject - returns TRUE if location has not already been registered.
*)
PROCEDURE RegisterModuleObject (fo: FileObjects; location: String) : BOOLEAN ;
VAR
p: FileObject ;
f: INTEGER ;
BEGIN
IF Debugging
THEN
fprintf1 (StdErr, "first time file %s has been registered... ", location)
END ;
IF NOT IsRegistered (fo, location)
THEN
NEW (p) ;
p^.name := Dup (location) ;
f := open (string (location), UNIXREADONLY, 0) ;
IF fileinode (f, p^.inodeLow, p^.inodeHigh) = 0
THEN
close (f) ;
IncludeIndiceIntoIndex (fo^.objects, p) ;
IF Debugging
THEN
fprintf0 (StdErr, " yes\n")
END ;
RETURN TRUE
ELSE
IF Debugging
THEN
fprintf0 (StdErr, " fileinode failed\n")
END
END ;
close (f) ;
DISPOSE (p)
END ;
IF Debugging
THEN
fprintf0 (StdErr, " no\n")
END ;
RETURN FALSE
END RegisterModuleObject ;
(*
isRegistered -
*)
PROCEDURE isRegistered (fo: FileObjects; f: INTEGER) : BOOLEAN ;
VAR
i, h,
low, high: CARDINAL ;
o : FileObject ;
BEGIN
IF fileinode (f, low, high) = 0
THEN
h := HighIndice (fo^.objects) ;
i := 1 ;
WHILE i <= h DO
o := GetIndice (fo^.objects, i) ;
IF o # NIL
THEN
IF (o^.inodeLow = low) AND (o^.inodeHigh = high)
THEN
RETURN TRUE
END
END ;
INC (i)
END
END ;
RETURN FALSE
END isRegistered ;
(*
IsRegistered - returns TRUE if the object at, location, is already registered.
It uses the physical location on the filesystem to determine the
uniqueness of the object file.
*)
PROCEDURE IsRegistered (fo: FileObjects; location: String) : BOOLEAN ;
VAR
f : INTEGER ;
result: BOOLEAN ;
BEGIN
f := open (string (location), UNIXREADONLY, 0) ;
result := isRegistered (fo, f) ;
close (f) ;
RETURN result
END IsRegistered ;
(*
InitFileObject - returns a new file object container.
*)
PROCEDURE InitFileObject () : FileObjects ;
VAR
fo: FileObjects ;
BEGIN
NEW (fo) ;
fo^.objects := InitIndex (1) ;
RETURN fo
END InitFileObject ;
(*
KillFileObject - destroys a file object container.
*)
PROCEDURE KillFileObject (fo: FileObjects) : FileObjects ;
BEGIN
fo^.objects := KillIndex (fo^.objects) ;
DISPOSE (fo) ;
RETURN NIL
END KillFileObject ;
END ObjectFiles.
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