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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.
*/
#include "tclInt.h"
/*
* 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.
*
*----------------------------------------------------------------------
*/
#undef Tcl_InitStubs
MODULE_SCOPE const char *
Tcl_InitStubs(
Tcl_Interp *interp,
const char *version,
int exact)
{
Interp *iPtr = (Interp *) interp;
const char *actualVersion = NULL;
TclStubInfoType stub;
const TclStubs *stubsPtr = iPtr->stubTable;
/*
* 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]
*/
if (!stubsPtr || (stubsPtr->magic != TCL_STUB_MAGIC)) {
iPtr->result = "interpreter uses an incompatible stubs mechanism";
iPtr->freeProc = TCL_STATIC;
return NULL;
}
actualVersion = stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 0, &stub.data);
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 || isDigit(*q)) {
/* Construct error message */
stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
return NULL;
}
} else {
actualVersion = stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 1, NULL);
if (actualVersion == NULL) {
return NULL;
}
}
}
TclInitStubTable(stub.version);
return actualVersion;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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