shared_source/c_tcl_base_7_5_w_mods/tclwindde.c

/* $Header$ */
/* 
 * tclWinDde.c --
 *
 *      This file provides procedures that implement the "send"
 *      command, allowing commands to be passed from interpreter
 *      to interpreter.
 *
 * Copyright (c) 1997 by Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclwindde.c,v 1.1.1.1 2001/06/13 04:48:43 dtashley Exp $
 */

#include "tclPort.h"
#include <ddeml.h>

/*
 * TCL_STORAGE_CLASS is set unconditionally to DLLEXPORT because the
 * Registry_Init declaration is in the source file itself, which is only
 * accessed when we are building a library.
 */

#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT

/* 
 * The following structure is used to keep track of the interpreters
 * registered by this process.
 */

typedef struct RegisteredInterp {
    struct RegisteredInterp *nextPtr;
                                /* The next interp this application knows
                                 * about. */
    char *name;                 /* Interpreter's name (malloc-ed). */
    Tcl_Interp *interp;         /* The interpreter attached to this name. */
} RegisteredInterp;

/*
 * Used to keep track of conversations.
 */

typedef struct Conversation {
    struct Conversation *nextPtr;
                                /* The next conversation in the list. */
    RegisteredInterp *riPtr;    /* The info we know about the conversation. */
    HCONV hConv;                /* The DDE handle for this conversation. */
    Tcl_Obj *returnPackagePtr;  /* The result package for this conversation. */
} Conversation;

typedef struct ThreadSpecificData {
    Conversation *currentConversations;
                                /* A list of conversations currently
                                 * being processed. */
    RegisteredInterp *interpListPtr;
                                /* List of all interpreters registered
                                 * in the current process. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * The following variables cannot be placed in thread-local storage.
 * The Mutex ddeMutex guards access to the ddeInstance.
 */
static HSZ ddeServiceGlobal = 0;
static DWORD ddeInstance;       /* The application instance handle given
                                 * to us by DdeInitialize. */
static int ddeIsServer = 0;

#define TCL_DDE_VERSION "1.1"
#define TCL_DDE_PACKAGE_NAME "dde"
#define TCL_DDE_SERVICE_NAME "TclEval"

TCL_DECLARE_MUTEX(ddeMutex)

/*
 * Forward declarations for procedures defined later in this file.
 */

static void                 DdeExitProc _ANSI_ARGS_((ClientData clientData));
static void                 DeleteProc _ANSI_ARGS_((ClientData clientData));
static Tcl_Obj *            ExecuteRemoteObject _ANSI_ARGS_((
                                RegisteredInterp *riPtr, 
                                Tcl_Obj *ddeObjectPtr));
static int                  MakeDdeConnection _ANSI_ARGS_((Tcl_Interp *interp,
                                char *name, HCONV *ddeConvPtr));
static HDDEDATA CALLBACK    DdeServerProc _ANSI_ARGS_((UINT uType,
                                UINT uFmt, HCONV hConv, HSZ ddeTopic,
                                HSZ ddeItem, HDDEDATA hData, DWORD dwData1, 
                                DWORD dwData2));
static void                 SetDdeError _ANSI_ARGS_((Tcl_Interp *interp));
int Tcl_DdeObjCmd(ClientData clientData,        /* Used only for deletion */
        Tcl_Interp *interp,             /* The interp we are sending from */
        int objc,                       /* Number of arguments */
        Tcl_Obj *CONST objv[]); /* The arguments */

EXTERN int Dde_Init(Tcl_Interp *interp);

/*
 *----------------------------------------------------------------------
 *
 * Dde_Init --
 *
 *      This procedure initializes the dde command.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

int
Dde_Init(
    Tcl_Interp *interp)
{
    ThreadSpecificData *tsdPtr;
    
    if (!Tcl_InitStubs(interp, "8.0", 0)) {
        return TCL_ERROR;
    }

    Tcl_CreateObjCommand(interp, "dde", Tcl_DdeObjCmd, NULL, NULL);

    tsdPtr = (ThreadSpecificData *)
        Tcl_GetThreadData((Tcl_ThreadDataKey *) &dataKey, sizeof(ThreadSpecificData));
    
    if (tsdPtr == NULL) {
        tsdPtr = TCL_TSD_INIT(&dataKey);
        tsdPtr->currentConversations = NULL;
        tsdPtr->interpListPtr = NULL;
    }
    Tcl_CreateExitHandler(DdeExitProc, NULL);

    return Tcl_PkgProvide(interp, TCL_DDE_PACKAGE_NAME, TCL_DDE_VERSION);
}


/*
 *----------------------------------------------------------------------
 *
 * Initialize --
 *
 *      Initialize the global DDE instance.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Registers the DDE server proc.
 *
 *----------------------------------------------------------------------
 */

static void
Initialize(void)
{
    int nameFound = 0;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    
    /*
     * See if the application is already registered; if so, remove its
     * current name from the registry. The deletion of the command
     * will take care of disposing of this entry.
     */

    if (tsdPtr->interpListPtr != NULL) {
        nameFound = 1;
    }

    /*
     * Make sure that the DDE server is there. This is done only once,
     * add an exit handler tear it down.
     */

    if (ddeInstance == 0) {
        Tcl_MutexLock(&ddeMutex);
        if (ddeInstance == 0) {
            if (DdeInitialize(&ddeInstance, DdeServerProc,
                    CBF_SKIP_REGISTRATIONS
                    | CBF_SKIP_UNREGISTRATIONS
                    | CBF_FAIL_POKES, 0) 
                    != DMLERR_NO_ERROR) {
                ddeInstance = 0;
            }
        }
        Tcl_MutexUnlock(&ddeMutex);
    }
    if ((ddeServiceGlobal == 0) && (nameFound != 0)) {
        Tcl_MutexLock(&ddeMutex);
        if ((ddeServiceGlobal == 0) && (nameFound != 0)) {
            ddeIsServer = 1;
            Tcl_CreateExitHandler(DdeExitProc, NULL);
            ddeServiceGlobal = DdeCreateStringHandle(ddeInstance, \
                    TCL_DDE_SERVICE_NAME, 0);
            DdeNameService(ddeInstance, ddeServiceGlobal, 0L, DNS_REGISTER);
        } else {
            ddeIsServer = 0;
        }
        Tcl_MutexUnlock(&ddeMutex);
    }
}    

/*
 *--------------------------------------------------------------
 *
 * DdeSetServerName --
 *
 *      This procedure is called to associate an ASCII name with a Dde
 *      server.  If the interpreter has already been named, the
 *      name replaces the old one.
 *
 * Results:
 *      The return value is the name actually given to the interp.
 *      This will normally be the same as name, but if name was already
 *      in use for a Dde Server then a name of the form "name #2" will
 *      be chosen,  with a high enough number to make the name unique.
 *
 * Side effects:
 *      Registration info is saved, thereby allowing the "send" command
 *      to be used later to invoke commands in the application.  In
 *      addition, the "send" command is created in the application's
 *      interpreter.  The registration will be removed automatically
 *      if the interpreter is deleted or the "send" command is removed.
 *
 *--------------------------------------------------------------
 */

static char *
DdeSetServerName(
    Tcl_Interp *interp,
    char *name                  /* The name that will be used to
                                 * refer to the interpreter in later
                                 * "send" commands.  Must be globally
                                 * unique. */
    )
{
    int suffix, offset;
    RegisteredInterp *riPtr, *prevPtr;
    Tcl_DString dString;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * See if the application is already registered; if so, remove its
     * current name from the registry. The deletion of the command
     * will take care of disposing of this entry.
     */

    for (riPtr = tsdPtr->interpListPtr, prevPtr = NULL; riPtr != NULL; 
            prevPtr = riPtr, riPtr = riPtr->nextPtr) {
        if (riPtr->interp == interp) {
            if (name != NULL) {
                if (prevPtr == NULL) {
                    tsdPtr->interpListPtr = tsdPtr->interpListPtr->nextPtr;
                } else {
                    prevPtr->nextPtr = riPtr->nextPtr;
                }
                break;
            } else {
                /*
                 * the name was NULL, so the caller is asking for
                 * the name of the current interp.
                 */

                return riPtr->name;
            }
        }
    }

    if (name == NULL) {
        /*
         * the name was NULL, so the caller is asking for
         * the name of the current interp, but it doesn't
         * have a name.
         */

        return "";
    }
    
    /*
     * Pick a name to use for the application.  Use "name" if it's not
     * already in use.  Otherwise add a suffix such as " #2", trying
     * larger and larger numbers until we eventually find one that is
     * unique.
     */

    suffix = 1;
    offset = 0;
    Tcl_DStringInit(&dString);

    /*
     * We have found a unique name. Now add it to the registry.
     */

    riPtr = (RegisteredInterp *) ckalloc(sizeof(RegisteredInterp));
    riPtr->interp = interp;
    riPtr->name = ckalloc(strlen(name) + 1);
    riPtr->nextPtr = tsdPtr->interpListPtr;
    tsdPtr->interpListPtr = riPtr;
    strcpy(riPtr->name, name);

    Tcl_CreateObjCommand(interp, "dde", Tcl_DdeObjCmd,
            (ClientData) riPtr, DeleteProc);
    if (Tcl_IsSafe(interp)) {
        Tcl_HideCommand(interp, "dde", "dde");
    }
    Tcl_DStringFree(&dString);

    /*
     * re-initialize with the new name
     */
    Initialize();
    
    return riPtr->name;
}

/*
 *--------------------------------------------------------------
 *
 * DeleteProc
 *
 *      This procedure is called when the command "dde" is destroyed.
 *
 * Results:
 *      none
 *
 * Side effects:
 *      The interpreter given by riPtr is unregistered.
 *
 *--------------------------------------------------------------
 */

static void
DeleteProc(clientData)
    ClientData clientData;      /* The interp we are deleting passed
                                 * as ClientData. */
{
    RegisteredInterp *riPtr = (RegisteredInterp *) clientData;
    RegisteredInterp *searchPtr, *prevPtr;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    for (searchPtr = tsdPtr->interpListPtr, prevPtr = NULL;
            (searchPtr != NULL) && (searchPtr != riPtr);
            prevPtr = searchPtr, searchPtr = searchPtr->nextPtr) {
        /*
         * Empty loop body.
         */
    }

    if (searchPtr != NULL) {
        if (prevPtr == NULL) {
            tsdPtr->interpListPtr = tsdPtr->interpListPtr->nextPtr;
        } else {
            prevPtr->nextPtr = searchPtr->nextPtr;
        }
    }
    ckfree(riPtr->name);
    Tcl_EventuallyFree(clientData, TCL_DYNAMIC);
}

/*
 *--------------------------------------------------------------
 *
 * ExecuteRemoteObject --
 *
 *      Takes the package delivered by DDE and executes it in
 *      the server's interpreter.
 *
 * Results:
 *      A list Tcl_Obj * that describes what happened. The first
 *      element is the numerical return code (TCL_ERROR, etc.).
 *      The second element is the result of the script. If the
 *      return result was TCL_ERROR, then the third element
 *      will be the value of the global "errorCode", and the
 *      fourth will be the value of the global "errorInfo".
 *      The return result will have a refCount of 0.
 *
 * Side effects:
 *      A Tcl script is run, which can cause all kinds of other
 *      things to happen.
 *
 *--------------------------------------------------------------
 */

static Tcl_Obj *
ExecuteRemoteObject(
    RegisteredInterp *riPtr,        /* Info about this server. */
    Tcl_Obj *ddeObjectPtr)          /* The object to execute. */
{
    Tcl_Obj *errorObjPtr;
    Tcl_Obj *returnPackagePtr;
    int result;

    result = Tcl_EvalObjEx(riPtr->interp, ddeObjectPtr, TCL_EVAL_GLOBAL);
    returnPackagePtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL);
    Tcl_ListObjAppendElement(NULL, returnPackagePtr,
            Tcl_NewIntObj(result));
    Tcl_ListObjAppendElement(NULL, returnPackagePtr,
            Tcl_GetObjResult(riPtr->interp));
    if (result == TCL_ERROR) {
        errorObjPtr = Tcl_GetVar2Ex(riPtr->interp, "errorCode", NULL,
                TCL_GLOBAL_ONLY);
        Tcl_ListObjAppendElement(NULL, returnPackagePtr, errorObjPtr);
        errorObjPtr = Tcl_GetVar2Ex(riPtr->interp, "errorInfo", NULL,
                TCL_GLOBAL_ONLY);
        Tcl_ListObjAppendElement(NULL, returnPackagePtr, errorObjPtr);
    }

    return returnPackagePtr;
}

/*
 *--------------------------------------------------------------
 *
 * DdeServerProc --
 *
 *      Handles all transactions for this server. Can handle
 *      execute, request, and connect protocols. Dde will
 *      call this routine when a client attempts to run a dde
 *      command using this server.
 *
 * Results:
 *      A DDE Handle with the result of the dde command.
 *
 * Side effects:
 *      Depending on which command is executed, arbitrary
 *      Tcl scripts can be run.
 *
 *--------------------------------------------------------------
 */

static HDDEDATA CALLBACK
DdeServerProc (
    UINT uType,                 /* The type of DDE transaction we
                                 * are performing. */
    UINT uFmt,                  /* The format that data is sent or
                                 * received. */
    HCONV hConv,                /* The conversation associated with the 
                                 * current transaction. */
    HSZ ddeTopic,               /* A string handle. Transaction-type 
                                 * dependent. */
    HSZ ddeItem,                /* A string handle. Transaction-type 
                                 * dependent. */
    HDDEDATA hData,             /* DDE data. Transaction-type dependent. */
    DWORD dwData1,              /* Transaction-dependent data. */
    DWORD dwData2)              /* Transaction-dependent data. */
{
    Tcl_DString dString;
    int len;
    char *utilString;
    Tcl_Obj *ddeObjectPtr;
    HDDEDATA ddeReturn = NULL;
    RegisteredInterp *riPtr;
    Conversation *convPtr, *prevConvPtr;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    switch(uType) {
        case XTYP_CONNECT:

            /*
             * Dde is trying to initialize a conversation with us. Check
             * and make sure we have a valid topic.
             */

            len = DdeQueryString(ddeInstance, ddeTopic, NULL, 0, 0);
            Tcl_DStringInit(&dString);
            Tcl_DStringSetLength(&dString, len);
            utilString = Tcl_DStringValue(&dString);
            DdeQueryString(ddeInstance, ddeTopic, utilString, len + 1,
                    CP_WINANSI);

            for (riPtr = tsdPtr->interpListPtr; riPtr != NULL;
                    riPtr = riPtr->nextPtr) {
                if (stricmp(utilString, riPtr->name) == 0) {
                    Tcl_DStringFree(&dString);
                    return (HDDEDATA) TRUE;
                }
            }

            Tcl_DStringFree(&dString);
            return (HDDEDATA) FALSE;

        case XTYP_CONNECT_CONFIRM:

            /*
             * Dde has decided that we can connect, so it gives us a 
             * conversation handle. We need to keep track of it
             * so we know which execution result to return in an
             * XTYP_REQUEST.
             */

            len = DdeQueryString(ddeInstance, ddeTopic, NULL, 0, 0);
            Tcl_DStringInit(&dString);
            Tcl_DStringSetLength(&dString, len);
            utilString = Tcl_DStringValue(&dString);
            DdeQueryString(ddeInstance, ddeTopic, utilString, len + 1, 
                    CP_WINANSI);
            for (riPtr = tsdPtr->interpListPtr; riPtr != NULL; 
                    riPtr = riPtr->nextPtr) {
                if (stricmp(riPtr->name, utilString) == 0) {
                    convPtr = (Conversation *) ckalloc(sizeof(Conversation));
                    convPtr->nextPtr = tsdPtr->currentConversations;
                    convPtr->returnPackagePtr = NULL;
                    convPtr->hConv = hConv;
                    convPtr->riPtr = riPtr;
                    tsdPtr->currentConversations = convPtr;
                    break;
                }
            }
            Tcl_DStringFree(&dString);
            return (HDDEDATA) TRUE;

        case XTYP_DISCONNECT:

            /*
             * The client has disconnected from our server. Forget this
             * conversation.
             */

            for (convPtr = tsdPtr->currentConversations, prevConvPtr = NULL;
                    convPtr != NULL; 
                    prevConvPtr = convPtr, convPtr = convPtr->nextPtr) {
                if (hConv == convPtr->hConv) {
                    if (prevConvPtr == NULL) {
                        tsdPtr->currentConversations = convPtr->nextPtr;
                    } else {
                        prevConvPtr->nextPtr = convPtr->nextPtr;
                    }
                    if (convPtr->returnPackagePtr != NULL) {
                        Tcl_DecrRefCount(convPtr->returnPackagePtr);
                    }
                    ckfree((char *) convPtr);
                    break;
                }
            }
            return (HDDEDATA) TRUE;

        case XTYP_REQUEST:

            /*
             * This could be either a request for a value of a Tcl variable,
             * or it could be the send command requesting the results of the
             * last execute.
             */

            if (uFmt != CF_TEXT) {
                return (HDDEDATA) FALSE;
            }

            ddeReturn = (HDDEDATA) FALSE;
            for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)
                    && (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {
                /*
                 * Empty loop body.
                 */
            }

            if (convPtr != NULL) {
                char *returnString;

                len = DdeQueryString(ddeInstance, ddeItem, NULL, 0,
                        CP_WINANSI);
                Tcl_DStringInit(&dString);
                Tcl_DStringSetLength(&dString, len);
                utilString = Tcl_DStringValue(&dString);
                DdeQueryString(ddeInstance, ddeItem, utilString, 
                        len + 1, CP_WINANSI);
                if (stricmp(utilString, "$TCLEVAL$EXECUTE$RESULT") == 0) {
                    returnString =
                        Tcl_GetStringFromObj(convPtr->returnPackagePtr, &len);
                    ddeReturn = DdeCreateDataHandle(ddeInstance,
                            returnString, len+1, 0, ddeItem, CF_TEXT,
                            0);
                } else {
                    Tcl_Obj *variableObjPtr = Tcl_GetVar2Ex(
                            convPtr->riPtr->interp, utilString, NULL, 
                            TCL_GLOBAL_ONLY);
                    if (variableObjPtr != NULL) {
                        returnString = Tcl_GetStringFromObj(variableObjPtr,
                                &len);
                        ddeReturn = DdeCreateDataHandle(ddeInstance,
                                returnString, len+1, 0, ddeItem, CF_TEXT, 0);
                    } else {
                        ddeReturn = NULL;
                    }
                }
                Tcl_DStringFree(&dString);
            }
            return ddeReturn;

        case XTYP_EXECUTE: {

            /*
             * Execute this script. The results will be saved into
             * a list object which will be retreived later. See
             * ExecuteRemoteObject.
             */

            Tcl_Obj *returnPackagePtr;

            for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)
                    && (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {
                /*
                 * Empty loop body.
                 */

            }

            if (convPtr == NULL) {
                return (HDDEDATA) DDE_FNOTPROCESSED;
            }

            utilString = (char *) DdeAccessData(hData, &len);
            ddeObjectPtr = Tcl_NewStringObj(utilString, -1);
            Tcl_IncrRefCount(ddeObjectPtr);
            DdeUnaccessData(hData);
            if (convPtr->returnPackagePtr != NULL) {
                Tcl_DecrRefCount(convPtr->returnPackagePtr);
            }
            convPtr->returnPackagePtr = NULL;
            returnPackagePtr = 
                    ExecuteRemoteObject(convPtr->riPtr, ddeObjectPtr);
            for (convPtr = tsdPtr->currentConversations; (convPtr != NULL)
                    && (convPtr->hConv != hConv); convPtr = convPtr->nextPtr) {
                /*
                 * Empty loop body.
                 */

            }
            if (convPtr != NULL) {
                Tcl_IncrRefCount(returnPackagePtr);
                convPtr->returnPackagePtr = returnPackagePtr;
            }
            Tcl_DecrRefCount(ddeObjectPtr);
            if (returnPackagePtr == NULL) {
                return (HDDEDATA) DDE_FNOTPROCESSED;
            } else {
                return (HDDEDATA) DDE_FACK;
            }
        }
            
        case XTYP_WILDCONNECT: {

            /*
             * Dde wants a list of services and topics that we support.
             */

            HSZPAIR *returnPtr;
            int i;
            int numItems;

            for (i = 0, riPtr = tsdPtr->interpListPtr; riPtr != NULL;
                    i++, riPtr = riPtr->nextPtr) {
                /*
                 * Empty loop body.
                 */

            }

            numItems = i;
            ddeReturn = DdeCreateDataHandle(ddeInstance, NULL,
                    (numItems + 1) * sizeof(HSZPAIR), 0, 0, 0, 0);
            returnPtr = (HSZPAIR *) DdeAccessData(ddeReturn, &len);
            for (i = 0, riPtr = tsdPtr->interpListPtr; i < numItems; 
                    i++, riPtr = riPtr->nextPtr) {
                returnPtr[i].hszSvc = DdeCreateStringHandle(
                        ddeInstance, "TclEval", CP_WINANSI);
                returnPtr[i].hszTopic = DdeCreateStringHandle(
                        ddeInstance, riPtr->name, CP_WINANSI);
            }
            returnPtr[i].hszSvc = NULL;
            returnPtr[i].hszTopic = NULL;
            DdeUnaccessData(ddeReturn);
            return ddeReturn;
        }

    }
    return NULL;
}

/*
 *--------------------------------------------------------------
 *
 * DdeExitProc --
 *
 *      Gets rid of our DDE server when we go away.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The DDE server is deleted.
 *
 *--------------------------------------------------------------
 */

static void
DdeExitProc(
    ClientData clientData)          /* Not used in this handler. */
{
    DdeNameService(ddeInstance, NULL, 0, DNS_UNREGISTER);
    DdeUninitialize(ddeInstance);
    ddeInstance = 0;
}

/*
 *--------------------------------------------------------------
 *
 * MakeDdeConnection --
 *
 *      This procedure is a utility used to connect to a DDE
 *      server when given a server name and a topic name.
 *
 * Results:
 *      A standard Tcl result.
 *      
 *
 * Side effects:
 *      Passes back a conversation through ddeConvPtr
 *
 *--------------------------------------------------------------
 */

static int
MakeDdeConnection(
    Tcl_Interp *interp,         /* Used to report errors. */
    char *name,                 /* The connection to use. */
    HCONV *ddeConvPtr)
{
    HSZ ddeTopic, ddeService;
    HCONV ddeConv;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    
    ddeService = DdeCreateStringHandle(ddeInstance, "TclEval", 0);
    ddeTopic = DdeCreateStringHandle(ddeInstance, name, 0);

    ddeConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);
    DdeFreeStringHandle(ddeInstance, ddeService);
    DdeFreeStringHandle(ddeInstance, ddeTopic);

    if (ddeConv == (HCONV) NULL) {
        if (interp != NULL) {
            Tcl_AppendResult(interp, "no registered server named \"",
                    name, "\"", (char *) NULL);
        }
        return TCL_ERROR;
    }

    *ddeConvPtr = ddeConv;
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * SetDdeError --
 *
 *      Sets the interp result to a cogent error message
 *      describing the last DDE error.
 *
 * Results:
 *      None.
 *      
 *
 * Side effects:
 *      The interp's result object is changed.
 *
 *--------------------------------------------------------------
 */

static void
SetDdeError(
    Tcl_Interp *interp)     /* The interp to put the message in.*/
{
    Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);
    int err;

    err = DdeGetLastError(ddeInstance);
    switch (err) {
        case DMLERR_DATAACKTIMEOUT:
        case DMLERR_EXECACKTIMEOUT:
        case DMLERR_POKEACKTIMEOUT:
            Tcl_SetStringObj(resultPtr,
                    "remote interpreter did not respond", -1);
            break;

        case DMLERR_BUSY:
            Tcl_SetStringObj(resultPtr, "remote server is busy", -1);
            break;

        case DMLERR_NOTPROCESSED:
            Tcl_SetStringObj(resultPtr, 
                    "remote server cannot handle this command", -1);
            break;

        default:
            Tcl_SetStringObj(resultPtr, "dde command failed", -1);
    }
}

/*
 *--------------------------------------------------------------
 *
 * Tcl_DdeObjCmd --
 *
 *      This procedure is invoked to process the "dde" Tcl command.
 *      See the user documentation for details on what it does.
 *
 * Results:
 *      A standard Tcl result.
 *
 * Side effects:
 *      See the user documentation.
 *
 *--------------------------------------------------------------
 */

int
Tcl_DdeObjCmd(
    ClientData clientData,      /* Used only for deletion */
    Tcl_Interp *interp,         /* The interp we are sending from */
    int objc,                   /* Number of arguments */
    Tcl_Obj *CONST objv[])      /* The arguments */
{
    enum {
        DDE_SERVERNAME,
        DDE_EXECUTE,
        DDE_POKE,
        DDE_REQUEST,
        DDE_SERVICES,
        DDE_EVAL
    };

    static char *ddeCommands[] = {"servername", "execute", "poke",
          "request", "services", "eval", 
          (char *) NULL};
    static char *ddeOptions[] = {"-async", (char *) NULL};
    int index, argIndex;
    int async = 0;
    int result = TCL_OK;
    HSZ ddeService = NULL;
    HSZ ddeTopic = NULL;
    HSZ ddeItem = NULL;
    HDDEDATA ddeData = NULL;
    HDDEDATA ddeItemData = NULL;
    HCONV hConv = NULL;
    HSZ ddeCookie = 0;
    char *serviceName, *topicName, *itemString, *dataString;
    char *string;
    int firstArg, length, dataLength;
    DWORD ddeResult;
    HDDEDATA ddeReturn;
    RegisteredInterp *riPtr;
    Tcl_Interp *sendInterp;
    Tcl_Obj *objPtr;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * Initialize DDE server/client
     */
    
    if (objc < 2) {
        Tcl_WrongNumArgs(interp, 1, objv, 
                "?-async? serviceName topicName value");
        return TCL_ERROR;
    }

    if (Tcl_GetIndexFromObj(interp, objv[1], ddeCommands, "command", 0,
            &index) != TCL_OK) {
        return TCL_ERROR;
    }

    switch (index) {
        case DDE_SERVERNAME:
            if ((objc != 3) && (objc != 2)) {
                Tcl_WrongNumArgs(interp, 1, objv, 
                        "servername ?serverName?");
                return TCL_ERROR;
            }
            firstArg = (objc - 1);
            break;
        case DDE_EXECUTE:
            if ((objc < 5) || (objc > 6)) {
                Tcl_WrongNumArgs(interp, 1, objv, 
                        "execute ?-async? serviceName topicName value");
                return TCL_ERROR;
            }
            if (Tcl_GetIndexFromObj(NULL, objv[2], ddeOptions, "option", 0,
                    &argIndex) != TCL_OK) {
                if (objc != 5) {
                    Tcl_WrongNumArgs(interp, 1, objv,
                            "execute ?-async? serviceName topicName value");
                    return TCL_ERROR;
                }
                async = 0;
                firstArg = 2;
            } else {
                if (objc != 6) {
                    Tcl_WrongNumArgs(interp, 1, objv,
                            "execute ?-async? serviceName topicName value");
                    return TCL_ERROR;
                }
                async = 1;
                firstArg = 3;
            }
            break;
        case DDE_POKE:
            if (objc != 6) {
                Tcl_WrongNumArgs(interp, 1, objv,
                        "poke serviceName topicName item value");
                return TCL_ERROR;
            }
            firstArg = 2;
            break;
        case DDE_REQUEST:
            if (objc != 5) {
                Tcl_WrongNumArgs(interp, 1, objv, 
                        "request serviceName topicName value");
                return TCL_ERROR;
            }
            firstArg = 2;
            break;
        case DDE_SERVICES:
            if (objc != 4) {
                Tcl_WrongNumArgs(interp, 1, objv,
                        "services serviceName topicName");
                return TCL_ERROR;
            }
            firstArg = 2;
            break;
        case DDE_EVAL:
            if (objc < 4) {
                Tcl_WrongNumArgs(interp, 1, objv, 
                        "eval ?-async? serviceName args");
                return TCL_ERROR;
            }
            if (Tcl_GetIndexFromObj(NULL, objv[2], ddeOptions, "option", 0,
                    &argIndex) != TCL_OK) {
                if (objc < 4) {
                    Tcl_WrongNumArgs(interp, 1, objv,
                            "eval ?-async? serviceName args");
                    return TCL_ERROR;
                }
                async = 0;
                firstArg = 2;
            } else {
                if (objc < 5) {
                    Tcl_WrongNumArgs(interp, 1, objv,
                            "eval ?-async? serviceName args");
                    return TCL_ERROR;
                }
                async = 1;
                firstArg = 3;
            }
            break;
    }

    Initialize();

    if (firstArg != 1) {
        serviceName = Tcl_GetStringFromObj(objv[firstArg], &length);
    } else {
        length = 0;
    }

    if (length == 0) {
        serviceName = NULL;
    } else if ((index != DDE_SERVERNAME) && (index != DDE_EVAL)) {
        ddeService = DdeCreateStringHandle(ddeInstance, serviceName,
                CP_WINANSI);
    }

    if ((index != DDE_SERVERNAME) &&(index != DDE_EVAL)) {
        topicName = Tcl_GetStringFromObj(objv[firstArg + 1], &length);
        if (length == 0) {
            topicName = NULL;
        } else {
            ddeTopic = DdeCreateStringHandle(ddeInstance, 
                    topicName, CP_WINANSI);
        }
    }

    switch (index) {
        case DDE_SERVERNAME: {
            serviceName = DdeSetServerName(interp, serviceName);
            if (serviceName != NULL) {
                Tcl_SetStringObj(Tcl_GetObjResult(interp),
                        serviceName, -1);
            } else {
                Tcl_ResetResult(interp);
            }
            break;
        }
        case DDE_EXECUTE: {
            dataString = Tcl_GetStringFromObj(objv[firstArg + 2], &dataLength);
            if (dataLength == 0) {
                Tcl_SetStringObj(Tcl_GetObjResult(interp),
                        "cannot execute null data", -1);
                result = TCL_ERROR;
                break;
            }
            hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, 
                    NULL);
            DdeFreeStringHandle (ddeInstance, ddeService) ;
            DdeFreeStringHandle (ddeInstance, ddeTopic) ;

            if (hConv == NULL) {
                SetDdeError(interp);
                result = TCL_ERROR;
                break;
            }

            ddeData = DdeCreateDataHandle(ddeInstance, dataString,
                    dataLength+1, 0, 0, CF_TEXT, 0);
            if (ddeData != NULL) {
                if (async) {
                    DdeClientTransaction((LPBYTE) ddeData, 0xFFFFFFFF, hConv, 0, 
                            CF_TEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);
                    DdeAbandonTransaction(ddeInstance, hConv, 
                            ddeResult);
                } else {
                    ddeReturn = DdeClientTransaction((LPBYTE) ddeData, 0xFFFFFFFF,
                            hConv, 0, CF_TEXT, XTYP_EXECUTE, 30000, NULL);
                    if (ddeReturn == 0) {
                        SetDdeError(interp);
                        result = TCL_ERROR;
                    }
                }
                DdeFreeDataHandle(ddeData);
            } else {
                SetDdeError(interp);
                result = TCL_ERROR;
            }
            break;
        }
        case DDE_REQUEST: {
            itemString = Tcl_GetStringFromObj(objv[firstArg + 2], &length);
            if (length == 0) {
                Tcl_SetStringObj(Tcl_GetObjResult(interp),
                        "cannot request value of null data", -1);
                return TCL_ERROR;
            }
            hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);
            DdeFreeStringHandle (ddeInstance, ddeService) ;
            DdeFreeStringHandle (ddeInstance, ddeTopic) ;
            
            if (hConv == NULL) {
                SetDdeError(interp);
                result = TCL_ERROR;
            } else {
                Tcl_Obj *returnObjPtr;
                ddeItem = DdeCreateStringHandle(ddeInstance, 
                        itemString, CP_WINANSI);
                if (ddeItem != NULL) {
                    ddeData = DdeClientTransaction(NULL, 0, hConv, ddeItem,
                            CF_TEXT, XTYP_REQUEST, 5000, NULL);
                    if (ddeData == NULL) {
                        SetDdeError(interp);
                        result = TCL_ERROR;
                    } else {
                        dataString = DdeAccessData(ddeData, &dataLength);
                        returnObjPtr = Tcl_NewStringObj(dataString, -1);
                        DdeUnaccessData(ddeData);
                        DdeFreeDataHandle(ddeData);
                        Tcl_SetObjResult(interp, returnObjPtr);
                    }
                } else {
                    SetDdeError(interp);
                    result = TCL_ERROR;
                }
            }

            break;
        }
        case DDE_POKE: {
            itemString = Tcl_GetStringFromObj(objv[firstArg + 2], &length);
            if (length == 0) {
                Tcl_SetStringObj(Tcl_GetObjResult(interp),
                        "cannot have a null item", -1);
                return TCL_ERROR;
            }
            dataString = Tcl_GetStringFromObj(objv[firstArg + 3], &length);
            
            hConv = DdeConnect(ddeInstance, ddeService, ddeTopic, NULL);
            DdeFreeStringHandle (ddeInstance,ddeService) ;
            DdeFreeStringHandle (ddeInstance, ddeTopic) ;

            if (hConv == NULL) {
                SetDdeError(interp);
                result = TCL_ERROR;
            } else {
                ddeItem = DdeCreateStringHandle(ddeInstance, itemString, \
                        CP_WINANSI);
                if (ddeItem != NULL) {
                    ddeData = DdeClientTransaction(dataString,length+1, \
                            hConv, ddeItem,
                            CF_TEXT, XTYP_POKE, 5000, NULL);
                    if (ddeData == NULL) {
                        SetDdeError(interp);
                        result = TCL_ERROR;
                    }
                } else {
                    SetDdeError(interp);
                    result = TCL_ERROR;
                }
            }
            break;
        }

        case DDE_SERVICES: {
            HCONVLIST hConvList;
            CONVINFO convInfo;
            Tcl_Obj *convListObjPtr, *elementObjPtr;
            Tcl_DString dString;
            char *name;
            
            convInfo.cb = sizeof(CONVINFO);
            hConvList = DdeConnectList(ddeInstance, ddeService, 
                    ddeTopic, 0, NULL);
            DdeFreeStringHandle (ddeInstance,ddeService) ;
            DdeFreeStringHandle (ddeInstance, ddeTopic) ;
            hConv = 0;
            convListObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL);
            Tcl_DStringInit(&dString);

            while (hConv = DdeQueryNextServer(hConvList, hConv), hConv != 0) {
                elementObjPtr = Tcl_NewListObj(0, (Tcl_Obj **) NULL);
                DdeQueryConvInfo(hConv, QID_SYNC, &convInfo);
                length = DdeQueryString(ddeInstance, 
                        convInfo.hszSvcPartner, NULL, 0, CP_WINANSI);
                Tcl_DStringSetLength(&dString, length);
                name = Tcl_DStringValue(&dString);
                DdeQueryString(ddeInstance, convInfo.hszSvcPartner, 
                        name, length + 1, CP_WINANSI);
                Tcl_ListObjAppendElement(interp, elementObjPtr,
                        Tcl_NewStringObj(name, length));
                length = DdeQueryString(ddeInstance, convInfo.hszTopic,
                        NULL, 0, CP_WINANSI);
                Tcl_DStringSetLength(&dString, length);
                name = Tcl_DStringValue(&dString);
                DdeQueryString(ddeInstance, convInfo.hszTopic, name,
                        length + 1, CP_WINANSI);
                Tcl_ListObjAppendElement(interp, elementObjPtr,
                        Tcl_NewStringObj(name, length));
                Tcl_ListObjAppendElement(interp, convListObjPtr, elementObjPtr);
            }
            DdeDisconnectList(hConvList);
            Tcl_SetObjResult(interp, convListObjPtr);
            Tcl_DStringFree(&dString);
            break;
        }
        case DDE_EVAL: {
            objc -= (async + 3);
            ((Tcl_Obj **) objv) += (async + 3);

            /*
             * See if the target interpreter is local.  If so, execute
             * the command directly without going through the DDE server.
             * Don't exchange objects between interps.  The target interp could
             * compile an object, producing a bytecode structure that refers to 
             * other objects owned by the target interp.  If the target interp 
             * is then deleted, the bytecode structure would be referring to 
             * deallocated objects.
             */
            
            for (riPtr = tsdPtr->interpListPtr; riPtr != NULL; riPtr
                     = riPtr->nextPtr) {
                if (stricmp(serviceName, riPtr->name) == 0) {
                    break;
                }
            }
            
            if (riPtr != NULL) {
                /*
                 * This command is to a local interp. No need to go through
                 * the server.
                 */
                
                Tcl_Preserve((ClientData) riPtr);
                sendInterp = riPtr->interp;
                Tcl_Preserve((ClientData) sendInterp);
                
                /*
                 * Don't exchange objects between interps.  The target interp would
                 * compile an object, producing a bytecode structure that refers to 
                 * other objects owned by the target interp.  If the target interp 
                 * is then deleted, the bytecode structure would be referring to 
                 * deallocated objects.
                 */

                if (objc == 1) {
                    result = Tcl_EvalObjEx(sendInterp, objv[0], TCL_EVAL_GLOBAL);
                } else {
                    objPtr = Tcl_ConcatObj(objc, objv);
                    Tcl_IncrRefCount(objPtr);
                    result = Tcl_EvalObjEx(sendInterp, objPtr, TCL_EVAL_GLOBAL);
                    Tcl_DecrRefCount(objPtr);
                }
                if (interp != sendInterp) {
                    if (result == TCL_ERROR) {
                        /*
                         * An error occurred, so transfer error information from the
                         * destination interpreter back to our interpreter.  
                         */
                        
                        Tcl_ResetResult(interp);
                        objPtr = Tcl_GetVar2Ex(sendInterp, "errorInfo", NULL, 
                                TCL_GLOBAL_ONLY);
                        string = Tcl_GetStringFromObj(objPtr, &length);
                        Tcl_AddObjErrorInfo(interp, string, length);
                        
                        objPtr = Tcl_GetVar2Ex(sendInterp, "errorCode", NULL,
                                TCL_GLOBAL_ONLY);
                        Tcl_SetObjErrorCode(interp, objPtr);
                    }
                    Tcl_SetObjResult(interp, Tcl_GetObjResult(sendInterp));
                }
                Tcl_Release((ClientData) riPtr);
                Tcl_Release((ClientData) sendInterp);
            } else {
                /*
                 * This is a non-local request. Send the script to the server and poll
                 * it for a result.
                 */
                
                if (MakeDdeConnection(interp, serviceName, &hConv) != TCL_OK) {
                    goto error;
                }
                
                objPtr = Tcl_ConcatObj(objc, objv);
                string = Tcl_GetStringFromObj(objPtr, &length);
                ddeItemData = DdeCreateDataHandle(ddeInstance, string, length+1, 0, 0,
                        CF_TEXT, 0);
                
                if (async) {
                    ddeData = DdeClientTransaction((LPBYTE) ddeItemData, 0xFFFFFFFF, hConv, 0,
                            CF_TEXT, XTYP_EXECUTE, TIMEOUT_ASYNC, &ddeResult);
                    DdeAbandonTransaction(ddeInstance, hConv, ddeResult);
                } else {
                    ddeData = DdeClientTransaction((LPBYTE) ddeItemData, 0xFFFFFFFF, hConv, 0,
                            CF_TEXT, XTYP_EXECUTE, 30000, NULL);
                    if (ddeData != 0) {
                        
                        ddeCookie = DdeCreateStringHandle(ddeInstance, 
                                "$TCLEVAL$EXECUTE$RESULT", CP_WINANSI);
                        ddeData = DdeClientTransaction(NULL, 0, hConv, ddeCookie,
                                CF_TEXT, XTYP_REQUEST, 30000, NULL);
                    }
                }
                
                
                Tcl_DecrRefCount(objPtr);
                
                if (ddeData == 0) {
                    SetDdeError(interp);
                    goto errorNoResult;
                }
                
                if (async == 0) {
                    Tcl_Obj *resultPtr;
                    
                    /*
                     * The return handle has a two or four element list in it. The first
                     * element is the return code (TCL_OK, TCL_ERROR, etc.). The
                     * second is the result of the script. If the return code is TCL_ERROR,
                     * then the third element is the value of the variable "errorCode",
                     * and the fourth is the value of the variable "errorInfo".
                     */
                    
                    resultPtr = Tcl_NewObj();
                    length = DdeGetData(ddeData, NULL, 0, 0);
                    Tcl_SetObjLength(resultPtr, length);
                    string = Tcl_GetString(resultPtr);
                    DdeGetData(ddeData, string, length, 0);
                    Tcl_SetObjLength(resultPtr, strlen(string));
                    
                    if (Tcl_ListObjIndex(NULL, resultPtr, 0, &objPtr) != TCL_OK) {
                        Tcl_DecrRefCount(resultPtr);
                        goto error;
                    }
                    if (Tcl_GetIntFromObj(NULL, objPtr, &result) != TCL_OK) {
                        Tcl_DecrRefCount(resultPtr);
                        goto error;
                    }
                    if (result == TCL_ERROR) {
                        Tcl_ResetResult(interp);
                        
                        if (Tcl_ListObjIndex(NULL, resultPtr, 3, &objPtr) != TCL_OK) {
                            Tcl_DecrRefCount(resultPtr);
                            goto error;
                        }
                        length = -1;
                        string = Tcl_GetStringFromObj(objPtr, &length);
                        Tcl_AddObjErrorInfo(interp, string, length);
                        
                        Tcl_ListObjIndex(NULL, resultPtr, 2, &objPtr);
                        Tcl_SetObjErrorCode(interp, objPtr);
                    }
                    if (Tcl_ListObjIndex(NULL, resultPtr, 1, &objPtr) != TCL_OK) {
                        Tcl_DecrRefCount(resultPtr);
                        goto error;
                    }
                    Tcl_SetObjResult(interp, objPtr);
                    Tcl_DecrRefCount(resultPtr);
                }
            }
        }
    }
    if (ddeCookie != NULL) {
        DdeFreeStringHandle(ddeInstance, ddeCookie);
    }
    if (ddeItem != NULL) {
        DdeFreeStringHandle(ddeInstance, ddeItem);
    }
    if (ddeItemData != NULL) {
        DdeFreeDataHandle(ddeItemData);
    }
    if (ddeData != NULL) {
        DdeFreeDataHandle(ddeData);
    }
    if (hConv != NULL) {
        DdeDisconnect(hConv);
    }
    return result;

    error:
    Tcl_SetStringObj(Tcl_GetObjResult(interp),
            "invalid data returned from server", -1);

    errorNoResult:
    if (ddeCookie != NULL) {
        DdeFreeStringHandle(ddeInstance, ddeCookie);
    }
    if (ddeItem != NULL) {
        DdeFreeStringHandle(ddeInstance, ddeItem);
    }
    if (ddeItemData != NULL) {
        DdeFreeDataHandle(ddeItemData);
    }
    if (ddeData != NULL) {
        DdeFreeDataHandle(ddeData);
    }
    if (hConv != NULL) {
        DdeDisconnect(hConv);
    }
    return TCL_ERROR;
}

/* End of tclwindde.c */