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+/*
+ * pkgua.c --
+ *
+ * This file contains a simple Tcl package "pkgua" that is intended
+ * for testing the Tcl dynamic unloading facilities.
+ *
+ * Copyright (c) 1995 Sun Microsystems, Inc.
+ * Copyright (c) 2004 Georgios Petasis
+ *
+ * See the file "license.terms" for information on usage and redistribution
+ * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+ *
+ * RCS: @(#) $Id: pkgua.c,v 1.1 2004/02/24 22:58:48 dkf Exp $
+ */
+
+#include "tcl.h"
+
+/*
+ * Prototypes for procedures defined later in this file:
+ */
+
+static int PkguaEqObjCmd _ANSI_ARGS_((ClientData clientData,
+ Tcl_Interp *interp, int objc, Tcl_Obj * CONST objv[]));
+static int PkguaQuoteObjCmd _ANSI_ARGS_((ClientData clientData,
+ Tcl_Interp *interp, int objc, Tcl_Obj * CONST objv[]));
+
+/*
+ * In the following hash table we are going to store a struct that
+ * holds all the command tokens created by Tcl_CreateObjCommand in an
+ * interpreter, indexed by the interpreter. In this way, we can find
+ * which command tokens we have registered in a specific interpreter,
+ * in order to unload them. We need to keep the various command tokens
+ * we have registered, as they are the only safe way to unregister our
+ * registered commands, even if they have been renamed.
+ *
+ * Note that this code is utterly single-threaded.
+ */
+
+static Tcl_HashTable interpTokenMap;
+static int interpTokenMapInitialised = 0;
+#define MAX_REGISTERED_COMMANDS 2
+
+
+static int
+PkguaInitTokensHashTable(void)
+{
+ if (interpTokenMapInitialised) {
+ return;
+ }
+ Tcl_InitHashTable(&interpTokenMap, TCL_ONE_WORD_KEYS);
+ interpTokenMapInitialised = 1;
+};
+
+static int
+PkguaFreeTokensHashTable(void)
+{
+ Tcl_HashSearch search;
+ Tcl_HashEntry *entryPtr;
+
+ for (entryPtr = Tcl_FirstHashEntry(&interpTokenMap, &search);
+ entryPtr != NULL; entryPtr = Tcl_NextHashEntry(&search)) {
+ Tcl_Free((char *) Tcl_GetHashValue(entryPtr));
+ }
+ interpTokenMapInitialised = 0;
+};
+
+static Tcl_Command *
+PkguaInterpToTokens(interp)
+ Tcl_Interp *interp;
+{
+ int newEntry;
+ Tcl_Command *cmdTokens;
+ Tcl_HashEntry *entryPtr =
+ Tcl_CreateHashEntry(&interpTokenMap, (char *) interp, &newEntry);
+
+ if (newEntry) {
+ cmdTokens = (Tcl_Command *)
+ Tcl_Alloc(sizeof(Tcl_Command) * (MAX_REGISTERED_COMMANDS+1));
+ for (newEntry=0 ; newEntry<MAX_REGISTERED_COMMANDS+1 ; ++newEntry) {
+ cmdTokens[newEntry] = NULL;
+ }
+ Tcl_SetHashValue(entryPtr, (ClientData) cmdTokens);
+ } else {
+ cmdTokens = (Tcl_Command *) Tcl_GetHashValue(entryPtr);
+ }
+ return cmdTokens;
+};
+
+static void
+PkguaDeleteTokens(interp)
+ Tcl_Interp *interp;
+{
+ Tcl_HashEntry *entryPtr =
+ Tcl_FindHashEntry(&interpTokenMap, (char *) interp);
+
+ if (entryPtr) {
+ Tcl_Free((char *) Tcl_GetHashValue(entryPtr));
+ Tcl_DeleteHashEntry(entryPtr);
+ }
+};
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * PkguaEqObjCmd --
+ *
+ * This procedure is invoked to process the "pkgua_eq" Tcl command.
+ * It expects two arguments and returns 1 if they are the same,
+ * 0 if they are different.
+ *
+ * Results:
+ * A standard Tcl result.
+ *
+ * Side effects:
+ * See the user documentation.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+PkguaEqObjCmd(dummy, interp, objc, objv)
+ ClientData dummy; /* Not used. */
+ Tcl_Interp *interp; /* Current interpreter. */
+ int objc; /* Number of arguments. */
+ Tcl_Obj * CONST objv[]; /* Argument objects. */
+{
+ int result;
+ CONST char *str1, *str2;
+ int len1, len2, n;
+
+ if (objc != 3) {
+ Tcl_WrongNumArgs(interp, 1, objv, "string1 string2");
+ return TCL_ERROR;
+ }
+
+ str1 = Tcl_GetStringFromObj(objv[1], &len1);
+ str2 = Tcl_GetStringFromObj(objv[2], &len2);
+ if (len1 == len2) {
+ result = (Tcl_UtfNcmp(str1, str2, len1) == 0);
+ } else {
+ result = 0;
+ }
+ Tcl_SetObjResult(interp, Tcl_NewIntObj(result));
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * PkguaQuoteObjCmd --
+ *
+ * This procedure is invoked to process the "pkgua_quote" Tcl command.
+ * It expects one argument, which it returns as result.
+ *
+ * Results:
+ * A standard Tcl result.
+ *
+ * Side effects:
+ * See the user documentation.
+ *
+ *----------------------------------------------------------------------
+ */
+
+static int
+PkguaQuoteObjCmd(dummy, interp, objc, objv)
+ ClientData dummy; /* Not used. */
+ Tcl_Interp *interp; /* Current interpreter. */
+ int objc; /* Number of arguments. */
+ Tcl_Obj * CONST objv[]; /* Argument strings. */
+{
+ if (objc != 2) {
+ Tcl_WrongNumArgs(interp, 1, objv, "value");
+ return TCL_ERROR;
+ }
+ Tcl_SetObjResult(interp, objv[1]);
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Pkgua_Init --
+ *
+ * This is a package initialization procedure, which is called
+ * by Tcl when this package is to be added to an interpreter.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Pkgua_Init(interp)
+ Tcl_Interp *interp; /* Interpreter in which the package is
+ * to be made available. */
+{
+ int code, cmdIndex = 0;
+ Tcl_Command *cmdTokens;
+
+ if (Tcl_InitStubs(interp, TCL_VERSION, 0) == NULL) {
+ return TCL_ERROR;
+ }
+
+ /*
+ * Initialise our Hash table, where we store the registered
+ * command tokens for each interpreter.
+ */
+
+ PkguaInitTokensHashTable();
+
+ code = Tcl_PkgProvide(interp, "Pkgua", "1.0");
+ if (code != TCL_OK) {
+ return code;
+ }
+
+ Tcl_SetVar(interp, "::pkgua_loaded", ".", TCL_APPEND_VALUE);
+
+ cmdTokens = PkguaInterpToTokens(interp);
+ cmdTokens[cmdIndex++] =
+ Tcl_CreateObjCommand(interp, "pkgua_eq", PkguaEqObjCmd,
+ (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
+ cmdTokens[cmdIndex++] =
+ Tcl_CreateObjCommand(interp, "pkgua_quote", PkguaQuoteObjCmd,
+ (ClientData) 0, (Tcl_CmdDeleteProc *) NULL);
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Pkgua_SafeInit --
+ *
+ * This is a package initialization procedure, which is called
+ * by Tcl when this package is to be added to an unsafe interpreter.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Pkgua_SafeInit(interp)
+ Tcl_Interp *interp; /* Interpreter in which the package is
+ * to be made available. */
+{
+ return Pkgua_Init(interp);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Pkgua_Unload --
+ *
+ * This is a package unloading initialization procedure, which is
+ * called by Tcl when this package is to be unloaded form an
+ * interpreter.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Pkgua_Unload(interp, flags)
+ Tcl_Interp *interp; /* Interpreter from which the package is
+ * to be unloaded. */
+ int flags; /* Flags passed by the unloading mechanism */
+{
+ int code, cmdIndex;
+ Tcl_Command *cmdTokens = PkguaInterpToTokens(interp);
+
+ for (cmdIndex=0 ; cmdIndex<MAX_REGISTERED_COMMANDS ; cmdIndex++) {
+ if (cmdTokens[cmdIndex] == NULL) {
+ continue;
+ }
+ code = Tcl_DeleteCommandFromToken(interp, cmdTokens[cmdIndex]);
+ if (code != TCL_OK) {
+ return code;
+ }
+ }
+
+ PkguaDeleteTokens(interp);
+
+ Tcl_SetVar(interp, "::pkgua_detached", ".", TCL_APPEND_VALUE);
+
+ if (flags == TCL_UNLOAD_DETACH_FROM_PROCESS) {
+ /*
+ * Tcl is ready to detach this library from the running
+ * application. We should free all the memory that is not
+ * related to any interpreter.
+ */
+ PkguaFreeTokensHashTable();
+
+ Tcl_SetVar(interp, "::pkgua_unloaded", ".", TCL_APPEND_VALUE);
+ }
+ return TCL_OK;
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * Pkgua_SafeUnload --
+ *
+ * This is a package unloading initialization procedure, which is
+ * called by Tcl when this package is to be unloaded form an
+ * interpreter.
+ *
+ * Results:
+ * None.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Pkgua_SafeUnload(interp, flags)
+ Tcl_Interp *interp; /* Interpreter from which the package is
+ * to be unloaded. */
+ int flags; /* Flags passed by the unloading mechanism */
+{
+ return Pkgua_Unload(interp, flags);
+}
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