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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"
#include "tclPort.h"
TclStubs *tclStubsPtr = NULL;
TclPlatStubs *tclPlatStubsPtr = NULL;
TclIntStubs *tclIntStubsPtr = NULL;
TclIntPlatStubs *tclIntPlatStubsPtr = NULL;
static TclStubs *
HasStubSupport(interp)
Tcl_Interp *interp;
{
Interp *iPtr = (Interp *) interp;
if (iPtr->stubTable && (iPtr->stubTable->magic == TCL_STUB_MAGIC)) {
return iPtr->stubTable;
}
interp->result = "interpreter uses an incompatible stubs mechanism";
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.
*
*----------------------------------------------------------------------
*/
#undef Tcl_InitStubs
CONST char *
Tcl_InitStubs(interp, version, exact)
Tcl_Interp *interp;
CONST char *version;
int exact;
{
CONST char *actualVersion = NULL;
TclStubs *stubsPtr;
/*
* 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]
*/
stubsPtr = HasStubSupport(interp);
if (!stubsPtr) {
return NULL;
}
actualVersion = stubsPtr->tcl_PkgRequireEx(interp, "Tcl", version, 0, NULL);
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;
}
}
}
tclStubsPtr = stubsPtr;
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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