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[/] [or1k/] [tags/] [start/] [insight/] [tk/] [unix/] [tkUnixSelect.c] - Rev 579
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/* * tkUnixSelect.c -- * * This file contains X specific routines for manipulating * selections. * * Copyright (c) 1995 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: tkUnixSelect.c,v 1.1.1.1 2002-01-16 10:26:01 markom Exp $ */ #include "tkInt.h" #include "tkSelect.h" /* * When handling INCR-style selection retrievals, the selection owner * uses the following data structure to communicate between the * ConvertSelection procedure and TkSelPropProc. */ typedef struct IncrInfo { TkWindow *winPtr; /* Window that owns selection. */ Atom selection; /* Selection that is being retrieved. */ Atom *multAtoms; /* Information about conversions to * perform: one or more pairs of * (target, property). This either * points to a retrieved property (for * MULTIPLE retrievals) or to a static * array. */ unsigned long numConversions; /* Number of entries in offsets (same as * # of pairs in multAtoms). */ int *offsets; /* One entry for each pair in * multAtoms; -1 means all data has * been transferred for this * conversion. -2 means only the * final zero-length transfer still * has to be done. Otherwise it is the * offset of the next chunk of data * to transfer. This array is malloc-ed. */ int numIncrs; /* Number of entries in offsets that * aren't -1 (i.e. # of INCR-mode transfers * not yet completed). */ Tcl_TimerToken timeout; /* Token for timer procedure. */ int idleTime; /* Number of seconds since we heard * anything from the selection * requestor. */ Window reqWindow; /* Requestor's window id. */ Time time; /* Timestamp corresponding to * selection at beginning of request; * used to abort transfer if selection * changes. */ struct IncrInfo *nextPtr; /* Next in list of all INCR-style * retrievals currently pending. */ } IncrInfo; static IncrInfo *pendingIncrs = NULL; /* List of all incr structures * currently active. */ /* * Largest property that we'll accept when sending or receiving the * selection: */ #define MAX_PROP_WORDS 100000 static TkSelRetrievalInfo *pendingRetrievals = NULL; /* List of all retrievals currently * being waited for. */ /* * Forward declarations for procedures defined in this file: */ static void ConvertSelection _ANSI_ARGS_((TkWindow *winPtr, XSelectionRequestEvent *eventPtr)); static void IncrTimeoutProc _ANSI_ARGS_((ClientData clientData)); static char * SelCvtFromX _ANSI_ARGS_((long *propPtr, int numValues, Atom type, Tk_Window tkwin)); static long * SelCvtToX _ANSI_ARGS_((char *string, Atom type, Tk_Window tkwin, int *numLongsPtr)); static int SelectionSize _ANSI_ARGS_((TkSelHandler *selPtr)); static void SelRcvIncrProc _ANSI_ARGS_((ClientData clientData, XEvent *eventPtr)); static void SelTimeoutProc _ANSI_ARGS_((ClientData clientData)); /* *---------------------------------------------------------------------- * * TkSelGetSelection -- * * Retrieve the specified selection from another process. * * Results: * The return value is a standard Tcl return value. * If an error occurs (such as no selection exists) * then an error message is left in interp->result. * * Side effects: * None. * *---------------------------------------------------------------------- */ int TkSelGetSelection(interp, tkwin, selection, target, proc, clientData) Tcl_Interp *interp; /* Interpreter to use for reporting * errors. */ Tk_Window tkwin; /* Window on whose behalf to retrieve * the selection (determines display * from which to retrieve). */ Atom selection; /* Selection to retrieve. */ Atom target; /* Desired form in which selection * is to be returned. */ Tk_GetSelProc *proc; /* Procedure to call to process the * selection, once it has been retrieved. */ ClientData clientData; /* Arbitrary value to pass to proc. */ { TkSelRetrievalInfo retr; TkWindow *winPtr = (TkWindow *) tkwin; TkDisplay *dispPtr = winPtr->dispPtr; /* * The selection is owned by some other process. To * retrieve it, first record information about the retrieval * in progress. Use an internal window as the requestor. */ retr.interp = interp; if (dispPtr->clipWindow == NULL) { int result; result = TkClipInit(interp, dispPtr); if (result != TCL_OK) { return result; } } retr.winPtr = (TkWindow *) dispPtr->clipWindow; retr.selection = selection; retr.property = selection; retr.target = target; retr.proc = proc; retr.clientData = clientData; retr.result = -1; retr.idleTime = 0; retr.nextPtr = pendingRetrievals; pendingRetrievals = &retr; /* * Initiate the request for the selection. Note: can't use * TkCurrentTime for the time. If we do, and this application hasn't * received any X events in a long time, the current time will be way * in the past and could even predate the time when the selection was * made; if this happens, the request will be rejected. */ XConvertSelection(winPtr->display, retr.selection, retr.target, retr.property, retr.winPtr->window, CurrentTime); /* * Enter a loop processing X events until the selection * has been retrieved and processed. If no response is * received within a few seconds, then timeout. */ retr.timeout = Tcl_CreateTimerHandler(1000, SelTimeoutProc, (ClientData) &retr); while (retr.result == -1) { Tcl_DoOneEvent(0); } Tcl_DeleteTimerHandler(retr.timeout); /* * Unregister the information about the selection retrieval * in progress. */ if (pendingRetrievals == &retr) { pendingRetrievals = retr.nextPtr; } else { TkSelRetrievalInfo *retrPtr; for (retrPtr = pendingRetrievals; retrPtr != NULL; retrPtr = retrPtr->nextPtr) { if (retrPtr->nextPtr == &retr) { retrPtr->nextPtr = retr.nextPtr; break; } } } return retr.result; } /* *---------------------------------------------------------------------- * * TkSelPropProc -- * * This procedure is invoked when property-change events * occur on windows not known to the toolkit. Its function * is to implement the sending side of the INCR selection * retrieval protocol when the selection requestor deletes * the property containing a part of the selection. * * Results: * None. * * Side effects: * If the property that is receiving the selection was just * deleted, then a new piece of the selection is fetched and * placed in the property, until eventually there's no more * selection to fetch. * *---------------------------------------------------------------------- */ void TkSelPropProc(eventPtr) register XEvent *eventPtr; /* X PropertyChange event. */ { register IncrInfo *incrPtr; int i, format; Atom target, formatType; register TkSelHandler *selPtr; long buffer[TK_SEL_WORDS_AT_ONCE]; int numItems; char *propPtr; Tk_ErrorHandler errorHandler; /* * See if this event announces the deletion of a property being * used for an INCR transfer. If so, then add the next chunk of * data to the property. */ if (eventPtr->xproperty.state != PropertyDelete) { return; } for (incrPtr = pendingIncrs; incrPtr != NULL; incrPtr = incrPtr->nextPtr) { if (incrPtr->reqWindow != eventPtr->xproperty.window) { continue; } for (i = 0; i < incrPtr->numConversions; i++) { if ((eventPtr->xproperty.atom != incrPtr->multAtoms[2*i + 1]) || (incrPtr->offsets[i] == -1)){ continue; } target = incrPtr->multAtoms[2*i]; incrPtr->idleTime = 0; for (selPtr = incrPtr->winPtr->selHandlerList; ; selPtr = selPtr->nextPtr) { if (selPtr == NULL) { incrPtr->multAtoms[2*i + 1] = None; incrPtr->offsets[i] = -1; incrPtr->numIncrs --; return; } if ((selPtr->target == target) && (selPtr->selection == incrPtr->selection)) { formatType = selPtr->format; if (incrPtr->offsets[i] == -2) { numItems = 0; ((char *) buffer)[0] = 0; } else { TkSelInProgress ip; ip.selPtr = selPtr; ip.nextPtr = pendingPtr; pendingPtr = &ip; numItems = (*selPtr->proc)(selPtr->clientData, incrPtr->offsets[i], (char *) buffer, TK_SEL_BYTES_AT_ONCE); pendingPtr = ip.nextPtr; if (ip.selPtr == NULL) { /* * The selection handler deleted itself. */ return; } if (numItems > TK_SEL_BYTES_AT_ONCE) { panic("selection handler returned too many bytes"); } else { if (numItems < 0) { numItems = 0; } } ((char *) buffer)[numItems] = '\0'; } if (numItems < TK_SEL_BYTES_AT_ONCE) { if (numItems <= 0) { incrPtr->offsets[i] = -1; incrPtr->numIncrs--; } else { incrPtr->offsets[i] = -2; } } else { incrPtr->offsets[i] += numItems; } if (formatType == XA_STRING) { propPtr = (char *) buffer; format = 8; } else { propPtr = (char *) SelCvtToX((char *) buffer, formatType, (Tk_Window) incrPtr->winPtr, &numItems); format = 32; } errorHandler = Tk_CreateErrorHandler( eventPtr->xproperty.display, -1, -1, -1, (int (*)()) NULL, (ClientData) NULL); XChangeProperty(eventPtr->xproperty.display, eventPtr->xproperty.window, eventPtr->xproperty.atom, formatType, format, PropModeReplace, (unsigned char *) propPtr, numItems); Tk_DeleteErrorHandler(errorHandler); if (propPtr != (char *) buffer) { ckfree(propPtr); } return; } } } } } /* *-------------------------------------------------------------- * * TkSelEventProc -- * * This procedure is invoked whenever a selection-related * event occurs. It does the lion's share of the work * in implementing the selection protocol. * * Results: * None. * * Side effects: * Lots: depends on the type of event. * *-------------------------------------------------------------- */ void TkSelEventProc(tkwin, eventPtr) Tk_Window tkwin; /* Window for which event was * targeted. */ register XEvent *eventPtr; /* X event: either SelectionClear, * SelectionRequest, or * SelectionNotify. */ { register TkWindow *winPtr = (TkWindow *) tkwin; TkDisplay *dispPtr = winPtr->dispPtr; Tcl_Interp *interp; /* * Case #1: SelectionClear events. */ if (eventPtr->type == SelectionClear) { TkSelClearSelection(tkwin, eventPtr); } /* * Case #2: SelectionNotify events. Call the relevant procedure * to handle the incoming selection. */ if (eventPtr->type == SelectionNotify) { register TkSelRetrievalInfo *retrPtr; char *propInfo; Atom type; int format, result; unsigned long numItems, bytesAfter; for (retrPtr = pendingRetrievals; ; retrPtr = retrPtr->nextPtr) { if (retrPtr == NULL) { return; } if ((retrPtr->winPtr == winPtr) && (retrPtr->selection == eventPtr->xselection.selection) && (retrPtr->target == eventPtr->xselection.target) && (retrPtr->result == -1)) { if (retrPtr->property == eventPtr->xselection.property) { break; } if (eventPtr->xselection.property == None) { Tcl_SetResult(retrPtr->interp, (char *) NULL, TCL_STATIC); Tcl_AppendResult(retrPtr->interp, Tk_GetAtomName(tkwin, retrPtr->selection), " selection doesn't exist or form \"", Tk_GetAtomName(tkwin, retrPtr->target), "\" not defined", (char *) NULL); retrPtr->result = TCL_ERROR; return; } } } propInfo = NULL; result = XGetWindowProperty(eventPtr->xselection.display, eventPtr->xselection.requestor, retrPtr->property, 0, MAX_PROP_WORDS, False, (Atom) AnyPropertyType, &type, &format, &numItems, &bytesAfter, (unsigned char **) &propInfo); if ((result != Success) || (type == None)) { return; } if (bytesAfter != 0) { Tcl_SetResult(retrPtr->interp, "selection property too large", TCL_STATIC); retrPtr->result = TCL_ERROR; XFree(propInfo); return; } if ((type == XA_STRING) || (type == dispPtr->textAtom) || (type == dispPtr->compoundTextAtom)) { if (format != 8) { sprintf(retrPtr->interp->result, "bad format for string selection: wanted \"8\", got \"%d\"", format); retrPtr->result = TCL_ERROR; return; } interp = retrPtr->interp; Tcl_Preserve((ClientData) interp); retrPtr->result = (*retrPtr->proc)(retrPtr->clientData, interp, propInfo); Tcl_Release((ClientData) interp); } else if (type == dispPtr->incrAtom) { /* * It's a !?#@!?!! INCR-style reception. Arrange to receive * the selection in pieces, using the ICCCM protocol, then * hang around until either the selection is all here or a * timeout occurs. */ retrPtr->idleTime = 0; Tk_CreateEventHandler(tkwin, PropertyChangeMask, SelRcvIncrProc, (ClientData) retrPtr); XDeleteProperty(Tk_Display(tkwin), Tk_WindowId(tkwin), retrPtr->property); while (retrPtr->result == -1) { Tcl_DoOneEvent(0); } Tk_DeleteEventHandler(tkwin, PropertyChangeMask, SelRcvIncrProc, (ClientData) retrPtr); } else { char *string; if (format != 32) { sprintf(retrPtr->interp->result, "bad format for selection: wanted \"32\", got \"%d\"", format); retrPtr->result = TCL_ERROR; return; } string = SelCvtFromX((long *) propInfo, (int) numItems, type, (Tk_Window) winPtr); interp = retrPtr->interp; Tcl_Preserve((ClientData) interp); retrPtr->result = (*retrPtr->proc)(retrPtr->clientData, interp, string); Tcl_Release((ClientData) interp); ckfree(string); } XFree(propInfo); return; } /* * Case #3: SelectionRequest events. Call ConvertSelection to * do the dirty work. */ if (eventPtr->type == SelectionRequest) { ConvertSelection(winPtr, &eventPtr->xselectionrequest); return; } } /* *---------------------------------------------------------------------- * * SelTimeoutProc -- * * This procedure is invoked once every second while waiting for * the selection to be returned. After a while it gives up and * aborts the selection retrieval. * * Results: * None. * * Side effects: * A new timer callback is created to call us again in another * second, unless time has expired, in which case an error is * recorded for the retrieval. * *---------------------------------------------------------------------- */ static void SelTimeoutProc(clientData) ClientData clientData; /* Information about retrieval * in progress. */ { register TkSelRetrievalInfo *retrPtr = (TkSelRetrievalInfo *) clientData; /* * Make sure that the retrieval is still in progress. Then * see how long it's been since any sort of response was received * from the other side. */ if (retrPtr->result != -1) { return; } retrPtr->idleTime++; if (retrPtr->idleTime >= 5) { /* * Use a careful procedure to store the error message, because * the result could already be partially filled in with a partial * selection return. */ Tcl_SetResult(retrPtr->interp, "selection owner didn't respond", TCL_STATIC); retrPtr->result = TCL_ERROR; } else { retrPtr->timeout = Tcl_CreateTimerHandler(1000, SelTimeoutProc, (ClientData) retrPtr); } } /* *---------------------------------------------------------------------- * * ConvertSelection -- * * This procedure is invoked to handle SelectionRequest events. * It responds to the requests, obeying the ICCCM protocols. * * Results: * None. * * Side effects: * Properties are created for the selection requestor, and a * SelectionNotify event is generated for the selection * requestor. In the event of long selections, this procedure * implements INCR-mode transfers, using the ICCCM protocol. * *---------------------------------------------------------------------- */ static void ConvertSelection(winPtr, eventPtr) TkWindow *winPtr; /* Window that received the * conversion request; may not be * selection's current owner, be we * set it to the current owner. */ register XSelectionRequestEvent *eventPtr; /* Event describing request. */ { XSelectionEvent reply; /* Used to notify requestor that * selection info is ready. */ int multiple; /* Non-zero means a MULTIPLE request * is being handled. */ IncrInfo incr; /* State of selection conversion. */ Atom singleInfo[2]; /* incr.multAtoms points here except * for multiple conversions. */ int i; Tk_ErrorHandler errorHandler; TkSelectionInfo *infoPtr; TkSelInProgress ip; errorHandler = Tk_CreateErrorHandler(eventPtr->display, -1, -1,-1, (int (*)()) NULL, (ClientData) NULL); /* * Initialize the reply event. */ reply.type = SelectionNotify; reply.serial = 0; reply.send_event = True; reply.display = eventPtr->display; reply.requestor = eventPtr->requestor; reply.selection = eventPtr->selection; reply.target = eventPtr->target; reply.property = eventPtr->property; if (reply.property == None) { reply.property = reply.target; } reply.time = eventPtr->time; for (infoPtr = winPtr->dispPtr->selectionInfoPtr; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->selection == eventPtr->selection) break; } if (infoPtr == NULL) { goto refuse; } winPtr = (TkWindow *) infoPtr->owner; /* * Figure out which kind(s) of conversion to perform. If handling * a MULTIPLE conversion, then read the property describing which * conversions to perform. */ incr.winPtr = winPtr; incr.selection = eventPtr->selection; if (eventPtr->target != winPtr->dispPtr->multipleAtom) { multiple = 0; singleInfo[0] = reply.target; singleInfo[1] = reply.property; incr.multAtoms = singleInfo; incr.numConversions = 1; } else { Atom type; int format, result; unsigned long bytesAfter; multiple = 1; incr.multAtoms = NULL; if (eventPtr->property == None) { goto refuse; } result = XGetWindowProperty(eventPtr->display, eventPtr->requestor, eventPtr->property, 0, MAX_PROP_WORDS, False, XA_ATOM, &type, &format, &incr.numConversions, &bytesAfter, (unsigned char **) &incr.multAtoms); if ((result != Success) || (bytesAfter != 0) || (format != 32) || (type == None)) { if (incr.multAtoms != NULL) { XFree((char *) incr.multAtoms); } goto refuse; } incr.numConversions /= 2; /* Two atoms per conversion. */ } /* * Loop through all of the requested conversions, and either return * the entire converted selection, if it can be returned in a single * bunch, or return INCR information only (the actual selection will * be returned below). */ incr.offsets = (int *) ckalloc((unsigned) (incr.numConversions*sizeof(int))); incr.numIncrs = 0; for (i = 0; i < incr.numConversions; i++) { Atom target, property, type; long buffer[TK_SEL_WORDS_AT_ONCE]; register TkSelHandler *selPtr; int numItems, format; char *propPtr; target = incr.multAtoms[2*i]; property = incr.multAtoms[2*i + 1]; incr.offsets[i] = -1; for (selPtr = winPtr->selHandlerList; selPtr != NULL; selPtr = selPtr->nextPtr) { if ((selPtr->target == target) && (selPtr->selection == eventPtr->selection)) { break; } } if (selPtr == NULL) { /* * Nobody seems to know about this kind of request. If * it's of a sort that we can handle without any help, do * it. Otherwise mark the request as an errror. */ numItems = TkSelDefaultSelection(infoPtr, target, (char *) buffer, TK_SEL_BYTES_AT_ONCE, &type); if (numItems < 0) { incr.multAtoms[2*i + 1] = None; continue; } } else { ip.selPtr = selPtr; ip.nextPtr = pendingPtr; pendingPtr = &ip; type = selPtr->format; numItems = (*selPtr->proc)(selPtr->clientData, 0, (char *) buffer, TK_SEL_BYTES_AT_ONCE); pendingPtr = ip.nextPtr; if ((ip.selPtr == NULL) || (numItems < 0)) { incr.multAtoms[2*i + 1] = None; continue; } if (numItems > TK_SEL_BYTES_AT_ONCE) { panic("selection handler returned too many bytes"); } ((char *) buffer)[numItems] = '\0'; } /* * Got the selection; store it back on the requestor's property. */ if (numItems == TK_SEL_BYTES_AT_ONCE) { /* * Selection is too big to send at once; start an * INCR-mode transfer. */ incr.numIncrs++; type = winPtr->dispPtr->incrAtom; buffer[0] = SelectionSize(selPtr); if (buffer[0] == 0) { incr.multAtoms[2*i + 1] = None; continue; } numItems = 1; propPtr = (char *) buffer; format = 32; incr.offsets[i] = 0; } else if (type == XA_STRING) { propPtr = (char *) buffer; format = 8; } else { propPtr = (char *) SelCvtToX((char *) buffer, type, (Tk_Window) winPtr, &numItems); format = 32; } XChangeProperty(reply.display, reply.requestor, property, type, format, PropModeReplace, (unsigned char *) propPtr, numItems); if (propPtr != (char *) buffer) { ckfree(propPtr); } } /* * Send an event back to the requestor to indicate that the * first stage of conversion is complete (everything is done * except for long conversions that have to be done in INCR * mode). */ if (incr.numIncrs > 0) { XSelectInput(reply.display, reply.requestor, PropertyChangeMask); incr.timeout = Tcl_CreateTimerHandler(1000, IncrTimeoutProc, (ClientData) &incr); incr.idleTime = 0; incr.reqWindow = reply.requestor; incr.time = infoPtr->time; incr.nextPtr = pendingIncrs; pendingIncrs = &incr; } if (multiple) { XChangeProperty(reply.display, reply.requestor, reply.property, XA_ATOM, 32, PropModeReplace, (unsigned char *) incr.multAtoms, (int) incr.numConversions*2); } else { /* * Not a MULTIPLE request. The first property in "multAtoms" * got set to None if there was an error in conversion. */ reply.property = incr.multAtoms[1]; } XSendEvent(reply.display, reply.requestor, False, 0, (XEvent *) &reply); Tk_DeleteErrorHandler(errorHandler); /* * Handle any remaining INCR-mode transfers. This all happens * in callbacks to TkSelPropProc, so just wait until the number * of uncompleted INCR transfers drops to zero. */ if (incr.numIncrs > 0) { IncrInfo *incrPtr2; while (incr.numIncrs > 0) { Tcl_DoOneEvent(0); } Tcl_DeleteTimerHandler(incr.timeout); errorHandler = Tk_CreateErrorHandler(winPtr->display, -1, -1,-1, (int (*)()) NULL, (ClientData) NULL); XSelectInput(reply.display, reply.requestor, 0L); Tk_DeleteErrorHandler(errorHandler); if (pendingIncrs == &incr) { pendingIncrs = incr.nextPtr; } else { for (incrPtr2 = pendingIncrs; incrPtr2 != NULL; incrPtr2 = incrPtr2->nextPtr) { if (incrPtr2->nextPtr == &incr) { incrPtr2->nextPtr = incr.nextPtr; break; } } } } /* * All done. Cleanup and return. */ ckfree((char *) incr.offsets); if (multiple) { XFree((char *) incr.multAtoms); } return; /* * An error occurred. Send back a refusal message. */ refuse: reply.property = None; XSendEvent(reply.display, reply.requestor, False, 0, (XEvent *) &reply); Tk_DeleteErrorHandler(errorHandler); return; } /* *---------------------------------------------------------------------- * * SelRcvIncrProc -- * * This procedure handles the INCR protocol on the receiving * side. It is invoked in response to property changes on * the requestor's window (which hopefully are because a new * chunk of the selection arrived). * * Results: * None. * * Side effects: * If a new piece of selection has arrived, a procedure is * invoked to deal with that piece. When the whole selection * is here, a flag is left for the higher-level procedure that * initiated the selection retrieval. * *---------------------------------------------------------------------- */ static void SelRcvIncrProc(clientData, eventPtr) ClientData clientData; /* Information about retrieval. */ register XEvent *eventPtr; /* X PropertyChange event. */ { register TkSelRetrievalInfo *retrPtr = (TkSelRetrievalInfo *) clientData; char *propInfo; Atom type; int format, result; unsigned long numItems, bytesAfter; Tcl_Interp *interp; if ((eventPtr->xproperty.atom != retrPtr->property) || (eventPtr->xproperty.state != PropertyNewValue) || (retrPtr->result != -1)) { return; } propInfo = NULL; result = XGetWindowProperty(eventPtr->xproperty.display, eventPtr->xproperty.window, retrPtr->property, 0, MAX_PROP_WORDS, True, (Atom) AnyPropertyType, &type, &format, &numItems, &bytesAfter, (unsigned char **) &propInfo); if ((result != Success) || (type == None)) { return; } if (bytesAfter != 0) { Tcl_SetResult(retrPtr->interp, "selection property too large", TCL_STATIC); retrPtr->result = TCL_ERROR; goto done; } if (numItems == 0) { retrPtr->result = TCL_OK; } else if ((type == XA_STRING) || (type == retrPtr->winPtr->dispPtr->textAtom) || (type == retrPtr->winPtr->dispPtr->compoundTextAtom)) { if (format != 8) { Tcl_SetResult(retrPtr->interp, (char *) NULL, TCL_STATIC); sprintf(retrPtr->interp->result, "bad format for string selection: wanted \"8\", got \"%d\"", format); retrPtr->result = TCL_ERROR; goto done; } interp = retrPtr->interp; Tcl_Preserve((ClientData) interp); result = (*retrPtr->proc)(retrPtr->clientData, interp, propInfo); Tcl_Release((ClientData) interp); if (result != TCL_OK) { retrPtr->result = result; } } else { char *string; if (format != 32) { Tcl_SetResult(retrPtr->interp, (char *) NULL, TCL_STATIC); sprintf(retrPtr->interp->result, "bad format for selection: wanted \"32\", got \"%d\"", format); retrPtr->result = TCL_ERROR; goto done; } string = SelCvtFromX((long *) propInfo, (int) numItems, type, (Tk_Window) retrPtr->winPtr); interp = retrPtr->interp; Tcl_Preserve((ClientData) interp); result = (*retrPtr->proc)(retrPtr->clientData, interp, string); Tcl_Release((ClientData) interp); if (result != TCL_OK) { retrPtr->result = result; } ckfree(string); } done: XFree(propInfo); retrPtr->idleTime = 0; } /* *---------------------------------------------------------------------- * * SelectionSize -- * * This procedure is called when the selection is too large to * send in a single buffer; it computes the total length of * the selection in bytes. * * Results: * The return value is the number of bytes in the selection * given by selPtr. * * Side effects: * The selection is retrieved from its current owner (this is * the only way to compute its size). * *---------------------------------------------------------------------- */ static int SelectionSize(selPtr) TkSelHandler *selPtr; /* Information about how to retrieve * the selection whose size is wanted. */ { char buffer[TK_SEL_BYTES_AT_ONCE+1]; int size, chunkSize; TkSelInProgress ip; size = TK_SEL_BYTES_AT_ONCE; ip.selPtr = selPtr; ip.nextPtr = pendingPtr; pendingPtr = &ip; do { chunkSize = (*selPtr->proc)(selPtr->clientData, size, (char *) buffer, TK_SEL_BYTES_AT_ONCE); if (ip.selPtr == NULL) { size = 0; break; } size += chunkSize; } while (chunkSize == TK_SEL_BYTES_AT_ONCE); pendingPtr = ip.nextPtr; return size; } /* *---------------------------------------------------------------------- * * IncrTimeoutProc -- * * This procedure is invoked once a second while sending the * selection to a requestor in INCR mode. After a while it * gives up and aborts the selection operation. * * Results: * None. * * Side effects: * A new timeout gets registered so that this procedure gets * called again in another second, unless too many seconds * have elapsed, in which case incrPtr is marked as "all done". * *---------------------------------------------------------------------- */ static void IncrTimeoutProc(clientData) ClientData clientData; /* Information about INCR-mode * selection retrieval for which * we are selection owner. */ { register IncrInfo *incrPtr = (IncrInfo *) clientData; incrPtr->idleTime++; if (incrPtr->idleTime >= 5) { incrPtr->numIncrs = 0; } else { incrPtr->timeout = Tcl_CreateTimerHandler(1000, IncrTimeoutProc, (ClientData) incrPtr); } } /* *---------------------------------------------------------------------- * * SelCvtToX -- * * Given a selection represented as a string (the normal Tcl form), * convert it to the ICCCM-mandated format for X, depending on * the type argument. This procedure and SelCvtFromX are inverses. * * Results: * The return value is a malloc'ed buffer holding a value * equivalent to "string", but formatted as for "type". It is * the caller's responsibility to free the string when done with * it. The word at *numLongsPtr is filled in with the number of * 32-bit words returned in the result. * * Side effects: * None. * *---------------------------------------------------------------------- */ static long * SelCvtToX(string, type, tkwin, numLongsPtr) char *string; /* String representation of selection. */ Atom type; /* Atom specifying the X format that is * desired for the selection. Should not * be XA_STRING (if so, don't bother calling * this procedure at all). */ Tk_Window tkwin; /* Window that governs atom conversion. */ int *numLongsPtr; /* Number of 32-bit words contained in the * result. */ { register char *p; char *field; int numFields; long *propPtr, *longPtr; #define MAX_ATOM_NAME_LENGTH 100 char atomName[MAX_ATOM_NAME_LENGTH+1]; /* * The string is assumed to consist of fields separated by spaces. * The property gets generated by converting each field to an * integer number, in one of two ways: * 1. If type is XA_ATOM, convert each field to its corresponding * atom. * 2. If type is anything else, convert each field from an ASCII number * to a 32-bit binary number. */ numFields = 1; for (p = string; *p != 0; p++) { if (isspace(UCHAR(*p))) { numFields++; } } propPtr = (long *) ckalloc((unsigned) numFields*sizeof(long)); /* * Convert the fields one-by-one. */ for (longPtr = propPtr, *numLongsPtr = 0, p = string; ; longPtr++, (*numLongsPtr)++) { while (isspace(UCHAR(*p))) { p++; } if (*p == 0) { break; } field = p; while ((*p != 0) && !isspace(UCHAR(*p))) { p++; } if (type == XA_ATOM) { int length; length = p - field; if (length > MAX_ATOM_NAME_LENGTH) { length = MAX_ATOM_NAME_LENGTH; } strncpy(atomName, field, (unsigned) length); atomName[length] = 0; *longPtr = (long) Tk_InternAtom(tkwin, atomName); } else { char *dummy; *longPtr = strtol(field, &dummy, 0); } } return propPtr; } /* *---------------------------------------------------------------------- * * SelCvtFromX -- * * Given an X property value, formatted as a collection of 32-bit * values according to "type" and the ICCCM conventions, convert * the value to a string suitable for manipulation by Tcl. This * procedure is the inverse of SelCvtToX. * * Results: * The return value is the string equivalent of "property". It is * malloc-ed and should be freed by the caller when no longer * needed. * * Side effects: * None. * *---------------------------------------------------------------------- */ static char * SelCvtFromX(propPtr, numValues, type, tkwin) register long *propPtr; /* Property value from X. */ int numValues; /* Number of 32-bit values in property. */ Atom type; /* Type of property Should not be * XA_STRING (if so, don't bother calling * this procedure at all). */ Tk_Window tkwin; /* Window to use for atom conversion. */ { char *result; int resultSpace, curSize, fieldSize; char *atomName; /* * Convert each long in the property to a string value, which is * either the name of an atom (if type is XA_ATOM) or a hexadecimal * string. Make an initial guess about the size of the result, but * be prepared to enlarge the result if necessary. */ resultSpace = 12*numValues+1; curSize = 0; atomName = ""; /* Not needed, but eliminates compiler warning. */ result = (char *) ckalloc((unsigned) resultSpace); *result = '\0'; for ( ; numValues > 0; propPtr++, numValues--) { if (type == XA_ATOM) { atomName = Tk_GetAtomName(tkwin, (Atom) *propPtr); fieldSize = strlen(atomName) + 1; } else { fieldSize = 12; } if (curSize+fieldSize >= resultSpace) { char *newResult; resultSpace *= 2; if (curSize+fieldSize >= resultSpace) { resultSpace = curSize + fieldSize + 1; } newResult = (char *) ckalloc((unsigned) resultSpace); strncpy(newResult, result, (unsigned) curSize); ckfree(result); result = newResult; } if (curSize != 0) { result[curSize] = ' '; curSize++; } if (type == XA_ATOM) { strcpy(result+curSize, atomName); } else { sprintf(result+curSize, "0x%x", (unsigned int) *propPtr); } curSize += strlen(result+curSize); } return result; }
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