Added libXmu

1 files changed, 194 insertions, 0 deletions

diff --git a/libXmu/src/DisplayQue.c b/libXmu/src/DisplayQue.c
new file mode 100644
index 000000000..ae9f92e1d
--- /dev/null
+++ b/libXmu/src/DisplayQue.c
@@ -0,0 +1,194 @@
+/* $Xorg: DisplayQue.c,v 1.4 2001/02/09 02:03:52 xorgcvs Exp $ */
+
+/*
+ 
+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.
+
+*/
+/* $XFree86: xc/lib/Xmu/DisplayQue.c,v 3.4 2001/07/25 15:04:50 dawes Exp $ */
+
+/*
+ * 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 = (XmuDisplayQueue *) 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 ((char *) e);
+	e = nexte;
+    }
+    free ((char *) 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 = (XmuDisplayQueueEntry *) malloc (sizeof (XmuDisplayQueueEntry)))) {
+	return NULL;
+    }
+    if (!(e->closehook = XmuAddCloseDisplayHook (dpy, _DQCloseDisplay,
+						 (XPointer) q))) {
+	free ((char *) 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 ((char *) 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;
+}