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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.
*/
/*
* 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.
*/
#define USE_TCL_STUBS
#include "tclInt.h"
MODULE_SCOPE const TclStubs *tclStubsPtr;
MODULE_SCOPE const TclPlatStubs *tclPlatStubsPtr;
MODULE_SCOPE const TclIntStubs *tclIntStubsPtr;
MODULE_SCOPE const TclIntPlatStubs *tclIntPlatStubsPtr;
const TclStubs *tclStubsPtr = NULL;
const TclPlatStubs *tclPlatStubsPtr = NULL;
const TclIntStubs *tclIntStubsPtr = NULL;
const TclIntPlatStubs *tclIntPlatStubsPtr = NULL;
static const TclStubs *
HasStubSupport(
Tcl_Interp *interp)
{
Interp *iPtr = (Interp *) interp;
if (iPtr->stubTable && iPtr->stubTable->magic == TCL_STUB_MAGIC) {
return iPtr->stubTable;
}
iPtr->result =
(char *) "interpreter uses an incompatible stubs mechanism";
iPtr->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');
}
/*
*----------------------------------------------------------------------
*
* TclInitStubs --
*
* 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.
*
*----------------------------------------------------------------------
*/
MODULE_SCOPE const char *
TclInitStubs(
Tcl_Interp *interp,
const char *version,
int exact,
int major,
int magic)
{
Interp *iPtr = (Interp *) interp;
const char *actualVersion = NULL;
ClientData pkgData = NULL;
const char *p, *q;
/*
* Detect whether the extension and the stubs library were built
* against Tcl header files declaring use of incompatible stubs
* mechanisms. Even within the same mechanism, also detect if
* the header files are from different major versions. Either
* is seriously broken. An extension and its stubs library ought
* to share compatible headers, if not the same one.
*/
if (magic != TCL_STUB_MAGIC || major != TCL_MAJOR_VERSION) {
iPtr->result =
(char *) "extension linked to incompatible stubs library";
iPtr->freeProc = TCL_STATIC;
return NULL;
}
/*
* Detect whether an extension compiled against a Tcl header file
* of one major version is requesting to use a stubs table of a
* different major version. According to our compat rules, that's
* a request that cannot succeed. Different major versions imply
* incompatible stub tables.
*/
p = version;
q = TCL_VERSION;
while (isDigit(*p)) {
if (*p++ != *q++) {
goto badVersion;
}
}
if (isDigit(*q)) {
badVersion:
iPtr->result = (char *)
"extension passed bad version argument to stubs library";
iPtr->freeProc = TCL_STATIC;
return 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) {
p = version;
int count = 0;
while (*p) {
count += !isDigit(*p++);
}
if (count == 1) {
q = actualVersion;
p = version;
while (*p && (*p == *q)) {
p++; q++;
}
if (*p) {
/* Construct error message */
Tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
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;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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