/*
 * xotclStubLib.c --
 *
 *      Stub object that will be statically linked into extensions of XOTcl
 *
 * Copyright (c) 2001-2008 Gustaf Neumann, Uwe Zdun
 * Copyright (c) 1998 Paul Duffin.
 *
 * See the file "tcl-license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 */

/*
 * 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

/*
 * This ensures that the Xotcl_InitStubs has a prototype in
 * xotcl.h and is not the macro that turns it into Tcl_PkgRequire
 */

#ifndef USE_XOTCL_STUBS
#define USE_XOTCL_STUBS
#endif

#include "xotclInt.h"

XotclStubs *xotclStubsPtr = NULL;
XotclIntStubs *xotclIntStubsPtr = NULL;

/*
 *----------------------------------------------------------------------
 *
 * Xotcl_InitStubs --
 *
 *      Tries to initialise the stub table pointers and ensures that
 *      the correct version of XOTcl is loaded.
 *
 * Results:
 *      The actual version of XOTcl that satisfies the request, or
 *      NULL to indicate that an error occurred.
 *
 * Side effects:
 *      Sets the stub table pointers.
 *
 *----------------------------------------------------------------------
 */

CONST char *
Xotcl_InitStubs (interp, version, exact)
    Tcl_Interp *interp;
    CONST char *version;
    int exact;
{
    CONST char *actualVersion;

    actualVersion = Tcl_PkgRequireEx(interp, "XOTcl", version, exact,
        (ClientData *) &xotclStubsPtr);

    if (actualVersion == NULL) {
        xotclStubsPtr = NULL;
        return NULL;
    }

    if (xotclStubsPtr == NULL) {
        return NULL;
    }

    if (xotclStubsPtr->hooks) {
        xotclIntStubsPtr = xotclStubsPtr->hooks->xotclIntStubs;
    } else {
        xotclIntStubsPtr = NULL;
    }

    return actualVersion;
}