IABSD.fr/xenocara/lib/libXmu/src/DisplayQue.c

Branch : - branch - master - tag -

• Show log

  Commit

• Author : matthieu
  Date : 2022-11-07 11:48:25
  Hash : b3dd6d9d
  Message : Update libXmu to version 1.1.4

• lib/libXmu/src/DisplayQue.c

• /*
  
  Copyright 1989, 1998  The Open Group
  
  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  Except as contained in this notice, the name of The Open Group shall not be
  used in advertising or otherwise to promote the sale, use or other dealings
  in this Software without prior written authorization from The Open Group.
  
  */
  
  /*
   * Author:  Jim Fulton, MIT X Consortium
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <stdio.h>
  #include <X11/Xlib.h>
  #include <stdlib.h>
  #include <X11/Xmu/DisplayQue.h>
  
  /*
   * Prototypes
   */
  static int _DQCloseDisplay(Display*, XPointer);
  
  #define CallCloseCallback(q,e) (void) (*((q)->closefunc)) ((q), (e))
  #define CallFreeCallback(q) (void) (*((q)->freefunc)) ((q))
  
  /*
   * XmuDQCreate - create a display queue
   */
  XmuDisplayQueue *
  XmuDQCreate(XmuCloseDisplayQueueProc closefunc,
  	    XmuFreeDisplayQueueProc freefunc,
  	    XPointer data)
  {
      XmuDisplayQueue *q = malloc (sizeof (XmuDisplayQueue));
      if (q) {
  	q->nentries = 0;
  	q->head = q->tail = NULL;
  	q->closefunc = closefunc;
  	q->freefunc = freefunc;
  	q->data = data;
      }
      return q;
  }
  
  
  /*
   * XmuDQDestroy - free all storage associated with this display queue,
   * optionally invoking the close callbacks.
   */
  
  Bool
  XmuDQDestroy(XmuDisplayQueue *q, Bool docallbacks)
  {
      XmuDisplayQueueEntry *e = q->head;
  
      while (e) {
  	XmuDisplayQueueEntry *nexte = e->next;
  	if (docallbacks && q->closefunc) CallCloseCallback (q, e);
  	free (e);
  	e = nexte;
      }
      free (q);
      return True;
  }
  
  
  /*
   * XmuDQLookupDisplay - finds the indicated display on the given queue
   */
  XmuDisplayQueueEntry *
  XmuDQLookupDisplay(XmuDisplayQueue *q, Display *dpy)
  {
      XmuDisplayQueueEntry *e;
  
      for (e = q->head; e; e = e->next) {
  	if (e->display == dpy) return e;
      }
      return NULL;
  }
  
  
  /*
   * XmuDQAddDisplay - add the specified display to the queue; set data as a
   * convenience.  Does not ensure that dpy hasn't already been added.
   */
  XmuDisplayQueueEntry *
  XmuDQAddDisplay(XmuDisplayQueue *q, Display *dpy, XPointer data)
  {
      XmuDisplayQueueEntry *e;
  
      if (!(e = malloc (sizeof (XmuDisplayQueueEntry)))) {
  	return NULL;
      }
      if (!(e->closehook = XmuAddCloseDisplayHook (dpy, _DQCloseDisplay,
  						 (XPointer) q))) {
  	free (e);
  	return NULL;
      }
  
      e->display = dpy;
      e->next = NULL;
      e->data = data;
  
      if (q->tail) {
  	q->tail->next = e;
  	e->prev = q->tail;
      } else {
  	q->head = e;
  	e->prev = NULL;
      }
      q->tail = e;
      q->nentries++;
      return e;
  }
  
  
  /*
   * XmuDQRemoveDisplay - remove the specified display from the queue
   */
  Bool
  XmuDQRemoveDisplay(XmuDisplayQueue *q, Display *dpy)
  {
      XmuDisplayQueueEntry *e;
  
      for (e = q->head; e; e = e->next) {
  	if (e->display == dpy) {
  	    if (q->head == e)
  	      q->head = e->next;	/* if at head, then bump head */
  	    else
  	      e->prev->next = e->next;	/* else splice out */
  	    if (q->tail == e)
  	      q->tail = e->prev;	/* if at tail, then bump tail */
  	    else
  	      e->next->prev = e->prev;	/* else splice out */
  	    (void) XmuRemoveCloseDisplayHook (dpy, e->closehook,
  					      _DQCloseDisplay, (XPointer) q);
  	    free (e);
  	    q->nentries--;
  	    return True;
  	}
      }
      return False;
  }
  
  
  /*****************************************************************************
   *			       private functions                             *
   *****************************************************************************/
  
  /*
   * _DQCloseDisplay - upcalled from CloseHook to notify this queue; remove the
   * display when finished
   */
  static int
  _DQCloseDisplay(Display *dpy, XPointer arg)
  {
      XmuDisplayQueue *q = (XmuDisplayQueue *) arg;
      XmuDisplayQueueEntry *e;
  
      for (e = q->head; e; e = e->next) {
  	if (e->display == dpy) {
  	    if (q->closefunc) CallCloseCallback (q, e);
  	    (void) XmuDQRemoveDisplay (q, dpy);
  	    if (q->nentries == 0 && q->freefunc) CallFreeCallback (q);
  	    return 1;
  	}
      }
  
      return 0;
  }