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/*
* tclStubLib.c --
*
* Stub object that will be statically linked into extensions that want
* to access Tcl.
*
* Copyright (c) 1998-1999 by Scriptics Corporation.
* Copyright (c) 1998 Paul Duffin.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclStubLib.c,v 1.9 2005/11/02 14:51:05 dkf Exp $
*/
/*
* We need to ensure that we use the stub macros so that this file contains no
* references to any of the stub functions. This will make it possible to
* build an extension that references Tcl_InitStubs but doesn't end up
* including the rest of the stub functions.
*/
#ifndef USE_TCL_STUBS
#define USE_TCL_STUBS
#endif
#undef USE_TCL_STUB_PROCS
#include "tclInt.h"
/*
* Ensure that Tcl_InitStubs is built as an exported symbol. The other stub
* functions should be built as non-exported symbols.
*/
#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT
TclStubs *tclStubsPtr = NULL;
TclPlatStubs *tclPlatStubsPtr = NULL;
TclIntStubs *tclIntStubsPtr = NULL;
TclIntPlatStubs *tclIntPlatStubsPtr = NULL;
static TclStubs * HasStubSupport(Tcl_Interp *interp);
static TclStubs *
HasStubSupport(
Tcl_Interp *interp)
{
Interp *iPtr = (Interp *) interp;
if (iPtr->stubTable && (iPtr->stubTable->magic == TCL_STUB_MAGIC)) {
return iPtr->stubTable;
}
interp->result =
"This interpreter does not support stubs-enabled extensions.";
interp->freeProc = TCL_STATIC;
return NULL;
}
/*
*----------------------------------------------------------------------
*
* Tcl_InitStubs --
*
* Tries to initialise the stub table pointers and ensures that the
* correct version of Tcl is loaded.
*
* Results:
* The actual version of Tcl that satisfies the request, or NULL to
* indicate that an error occurred.
*
* Side effects:
* Sets the stub table pointers.
*
*----------------------------------------------------------------------
*/
#ifdef Tcl_InitStubs
#undef Tcl_InitStubs
#endif
CONST char *
Tcl_InitStubs(
Tcl_Interp *interp,
CONST char *version,
int exact)
{
CONST char *actualVersion = NULL;
TclStubs *tmp;
TclStubs **tmpp;
/*
* We can't optimize this check by caching tclStubsPtr because that
* prevents apps from being able to load/unload Tcl dynamically multiple
* times. [Bug 615304]
*/
tclStubsPtr = HasStubSupport(interp);
if (!tclStubsPtr) {
return NULL;
}
/*
* This is needed to satisfy GCC 3.3's strict aliasing rules.
*/
tmpp = &tmp;
actualVersion = Tcl_PkgRequireEx(interp, "Tcl", version, exact,
(ClientData *) tmpp);
if (actualVersion == NULL) {
tclStubsPtr = NULL;
return NULL;
}
if (tclStubsPtr->hooks) {
tclPlatStubsPtr = tclStubsPtr->hooks->tclPlatStubs;
tclIntStubsPtr = tclStubsPtr->hooks->tclIntStubs;
tclIntPlatStubsPtr = tclStubsPtr->hooks->tclIntPlatStubs;
} else {
tclPlatStubsPtr = NULL;
tclIntStubsPtr = NULL;
tclIntPlatStubsPtr = NULL;
}
return actualVersion;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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