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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 1.21 2007/12/13 15:23:20 dgp 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"
/*
* Tcl_InitStubs and stub table pointers are built as exported symbols.
*/
TclStubs *tclStubsPtr = NULL;
TclPlatStubs *tclPlatStubsPtr = NULL;
TclIntStubs *tclIntStubsPtr = NULL;
TclIntPlatStubs *tclIntPlatStubsPtr = NULL;
TclTomMathStubs* tclTomMathStubsPtr = NULL;
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;
}
/*
* Use our own isdigit to avoid linking to libc on windows
*/
static int isDigit(const int c)
{
return (c >= '0' && c <= '9');
}
/*
*----------------------------------------------------------------------
*
* 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;
ClientData pkgData = NULL;
/*
* 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;
}
actualVersion = Tcl_PkgRequireEx(interp, "Tcl", version, 0, &pkgData);
if (actualVersion == NULL) {
return NULL;
}
if (exact) {
CONST char *p = version;
int count = 0;
while (*p) {
count += !isDigit(*p++);
}
if (count == 1) {
CONST char *q = actualVersion;
p = version;
while (*p && (*p == *q)) {
p++; q++;
}
if (*p) {
return NULL;
}
} else {
actualVersion = Tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
if (actualVersion == NULL) {
return NULL;
}
}
}
tclStubsPtr = (TclStubs*)pkgData;
if (tclStubsPtr->hooks) {
tclPlatStubsPtr = tclStubsPtr->hooks->tclPlatStubs;
tclIntStubsPtr = tclStubsPtr->hooks->tclIntStubs;
tclIntPlatStubsPtr = tclStubsPtr->hooks->tclIntPlatStubs;
} else {
tclPlatStubsPtr = NULL;
tclIntStubsPtr = NULL;
tclIntPlatStubsPtr = NULL;
}
return actualVersion;
}
/*
*----------------------------------------------------------------------
*
* TclTomMathInitStubs --
*
* Initializes the Stubs table for Tcl's subset of libtommath
*
* Results:
* Returns a standard Tcl result.
*
* This procedure should not be called directly, but rather through
* the TclTomMath_InitStubs macro, to insure that the Stubs table
* matches the header files used in compilation.
*
*----------------------------------------------------------------------
*/
#ifdef TclTomMathInitializeStubs
#undef TclTomMathInitializeStubs
#endif
CONST char*
TclTomMathInitializeStubs(
Tcl_Interp* interp, /* Tcl interpreter */
CONST char* version, /* Tcl version needed */
int epoch, /* Stubs table epoch from the header files */
int revision /* Stubs table revision number from the
* header files */
) {
int exact = 0;
const char* packageName = "tcl::tommath";
const char* errMsg = NULL;
ClientData pkgClientData = NULL;
const char* actualVersion =
Tcl_PkgRequireEx(interp, packageName, version, exact, &pkgClientData);
TclTomMathStubs* stubsPtr = (TclTomMathStubs*) pkgClientData;
if (actualVersion == NULL) {
return NULL;
}
if (pkgClientData == NULL) {
errMsg = "missing stub table pointer";
} else if ((stubsPtr->tclBN_epoch)() != epoch) {
errMsg = "epoch number mismatch";
} else if ((stubsPtr->tclBN_revision)() != revision) {
errMsg = "requires a later revision";
} else {
tclTomMathStubsPtr = stubsPtr;
return actualVersion;
}
Tcl_ResetResult(interp);
Tcl_AppendResult(interp, "error loading ", packageName,
" (requested version ", version,
", actual version ", actualVersion,
"): ", errMsg, NULL);
return NULL;
}
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