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/*
* tclMacLibrary.c --
*
* This file should be included in Tcl extensions that want to
* automatically open their resource forks when the code is linked.
* These routines should not be exported but should be compiled
* locally by each fragment. Many thanks to Jay Lieske
* <lieske@princeton.edu> who provide an initial version of this
* file.
*
* Copyright (c) 1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclMacLibrary.c,v 1.4 2000/02/10 09:59:10 jingham Exp $
*/
/*
* Here is another place that we are using the old routine names...
*/
#include <CodeFragments.h>
#include <Errors.h>
#include <Resources.h>
#include <Strings.h>
#include "tclMacInt.h"
/*
* These function are not currently defined in any header file. The
* only place they should be used is in the Initialization and
* Termination entry points for a code fragment. The prototypes
* are included here to avoid compile errors.
*/
OSErr TclMacInitializeFragment _ANSI_ARGS_((
struct CFragInitBlock* initBlkPtr));
void TclMacTerminateFragment _ANSI_ARGS_((void));
/*
* Static functions in this file.
*/
static OSErr OpenLibraryResource _ANSI_ARGS_((
struct CFragInitBlock* initBlkPtr));
static void CloseLibraryResource _ANSI_ARGS_((void));
/*
* The refnum of the opened resource fork.
*/
static short ourResFile = kResFileNotOpened;
/*
* This is the resource token for the our resource file.
* It stores the name we registered with the resource facility.
* We only need to use this if we are actually registering ourselves.
*/
#ifdef TCL_REGISTER_LIBRARY
static Tcl_Obj *ourResToken;
#endif
/*
*----------------------------------------------------------------------
*
* TclMacInitializeFragment --
*
* Called by MacOS CFM when the shared library is loaded. All this
* function really does is give Tcl a chance to open and register
* the resource fork of the library.
*
* Results:
* MacOS error code if loading should be canceled.
*
* Side effects:
* Opens the resource fork of the shared library file.
*
*----------------------------------------------------------------------
*/
OSErr
TclMacInitializeFragment(
struct CFragInitBlock* initBlkPtr) /* Pointer to our library. */
{
OSErr err = noErr;
#ifdef __MWERKS__
{
extern OSErr __initialize( CFragInitBlock* initBlkPtr);
err = __initialize((CFragInitBlock *) initBlkPtr);
}
#endif
if (err == noErr)
err = OpenLibraryResource( initBlkPtr);
return err;
}
/*
*----------------------------------------------------------------------
*
* TclMacTerminateFragment --
*
* Called by MacOS CFM when the shared library is unloaded.
*
* Results:
* None.
*
* Side effects:
* The resource fork of the code fragment is closed.
*
*----------------------------------------------------------------------
*/
void
TclMacTerminateFragment()
{
CloseLibraryResource();
#ifdef __MWERKS__
{
extern void __terminate(void);
__terminate();
}
#endif
}
/*
*----------------------------------------------------------------------
*
* OpenLibraryResource --
*
* This routine can be called by a MacOS fragment's initialiation
* function to open the resource fork of the file.
* Call it with the same data passed to the initialization function.
* If the fragment loading should fail if the resource fork can't
* be opened, then the initialization function can pass on this
* return value.
*
* If you #define TCL_REGISTER_RESOURCE before compiling this resource,
* then your library will register its open resource fork with the
* resource command.
*
* Results:
* It returns noErr on success and a MacOS error code on failure.
*
* Side effects:
* The resource fork of the code fragment is opened read-only and
* is installed at the head of the resource chain.
*
*----------------------------------------------------------------------
*/
static OSErr
OpenLibraryResource(
struct CFragInitBlock* initBlkPtr)
{
/*
* The 3.0 version of the Universal headers changed CFragInitBlock
* to an opaque pointer type. CFragSystem7InitBlock is now the
* real pointer.
*/
#if !defined(UNIVERSAL_INTERFACES_VERSION) || (UNIVERSAL_INTERFACES_VERSION < 0x0300)
struct CFragInitBlock *realInitBlkPtr = initBlkPtr;
#else
CFragSystem7InitBlock *realInitBlkPtr = (CFragSystem7InitBlock *) initBlkPtr;
#endif
FSSpec* fileSpec = NULL;
OSErr err = noErr;
if (realInitBlkPtr->fragLocator.where == kDataForkCFragLocator) {
fileSpec = realInitBlkPtr->fragLocator.u.onDisk.fileSpec;
} else if (realInitBlkPtr->fragLocator.where == kResourceCFragLocator) {
fileSpec = realInitBlkPtr->fragLocator.u.inSegs.fileSpec;
} else {
err = resFNotFound;
}
/*
* Open the resource fork for this library in read-only mode.
* This will make it the current res file, ahead of the
* application's own resources.
*/
if (fileSpec != NULL) {
ourResFile = FSpOpenResFile(fileSpec, fsRdPerm);
if (ourResFile == kResFileNotOpened) {
err = ResError();
} else {
#ifdef TCL_REGISTER_LIBRARY
ourResToken = Tcl_NewObj();
Tcl_IncrRefCount(ourResToken);
p2cstr(realInitBlkPtr->libName);
Tcl_SetStringObj(ourResToken, (char *) realInitBlkPtr->libName, -1);
c2pstr((char *) realInitBlkPtr->libName);
TclMacRegisterResourceFork(ourResFile, ourResToken,
TCL_RESOURCE_DONT_CLOSE);
#endif
SetResFileAttrs(ourResFile, mapReadOnly);
}
}
return err;
}
/*
*----------------------------------------------------------------------
*
* CloseLibraryResource --
*
* This routine should be called by a MacOS fragment's termination
* function to close the resource fork of the file
* that was opened with OpenLibraryResource.
*
* Results:
* None.
*
* Side effects:
* The resource fork of the code fragment is closed.
*
*----------------------------------------------------------------------
*/
static void
CloseLibraryResource()
{
if (ourResFile != kResFileNotOpened) {
#ifdef TCL_REGISTER_LIBRARY
int length;
TclMacUnRegisterResourceFork(
Tcl_GetStringFromObj(ourResToken, &length),
NULL);
Tcl_DecrRefCount(ourResToken);
#endif
CloseResFile(ourResFile);
ourResFile = kResFileNotOpened;
}
}
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