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+/*
+ * $Xorg: extutil.c,v 1.4 2001/02/09 02:03:49 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.
+ *
+ * Author: Jim Fulton, MIT X Consortium
+ *
+ *
+ * Xlib Extension-Writing Utilities
+ *
+ * This package contains utilities for writing the client API for various
+ * protocol extensions. THESE INTERFACES ARE NOT PART OF THE X STANDARD AND
+ * ARE SUBJECT TO CHANGE!
+ *
+ * Routines include:
+ *
+ * XextCreateExtension called once per extension
+ * XextDestroyExtension if no longer using extension
+ * XextAddDisplay add another display
+ * XextRemoveDisplay remove a display
+ * XextFindDisplay is a display open
+ *
+ * In addition, the following Xlib-style interfaces are provided:
+ *
+ * XSetExtensionErrorHandler establish an extension error handler
+ * XMissingExtension raise an error about missing ext
+ */
+
+#include <stdio.h>
+#include "Xlibint.h"
+#include "Xext.h"
+#include "extutil.h"
+
+
+/*
+ * XextCreateExtension - return an extension descriptor containing context
+ * information for this extension. This object is passed to all Xext
+ * routines.
+ */
+XExtensionInfo *XextCreateExtension ()
+{
+ register XExtensionInfo *info =
+ (XExtensionInfo *) Xmalloc (sizeof (XExtensionInfo));
+
+ if (info) {
+ info->head = NULL;
+ info->cur = NULL;
+ info->ndisplays = 0;
+ }
+ return info;
+}
+
+
+/*
+ * XextDestroyExtension - free memory the given extension descriptor
+ */
+void XextDestroyExtension (info)
+ XExtensionInfo *info;
+{
+ info->head = NULL; /* to catch refs after this */
+ info->cur = NULL;
+ info->ndisplays = 0;
+ XFree ((char *) info);
+}
+
+
+
+/*
+ * XextAddDisplay - add a display to this extension
+ */
+XExtDisplayInfo *XextAddDisplay (extinfo, dpy, ext_name, hooks, nevents, data)
+ XExtensionInfo *extinfo;
+ Display *dpy;
+ char *ext_name;
+ XExtensionHooks *hooks;
+ int nevents;
+ XPointer data;
+{
+ XExtDisplayInfo *dpyinfo;
+
+ dpyinfo = (XExtDisplayInfo *) Xmalloc (sizeof (XExtDisplayInfo));
+ if (!dpyinfo) return NULL;
+ dpyinfo->display = dpy;
+ dpyinfo->data = data;
+ dpyinfo->codes = XInitExtension (dpy, ext_name);
+
+ /*
+ * if the server has the extension, then we can initialize the
+ * appropriate function vectors
+ */
+ if (dpyinfo->codes) {
+ int i, j;
+
+ for (i = 0, j = dpyinfo->codes->first_event; i < nevents; i++, j++) {
+ XESetWireToEvent (dpy, j, hooks->wire_to_event);
+ XESetEventToWire (dpy, j, hooks->event_to_wire);
+ }
+ if (hooks->create_gc)
+ XESetCreateGC (dpy, dpyinfo->codes->extension, hooks->create_gc);
+ if (hooks->copy_gc)
+ XESetCopyGC (dpy, dpyinfo->codes->extension, hooks->copy_gc);
+ if (hooks->flush_gc)
+ XESetFlushGC (dpy, dpyinfo->codes->extension, hooks->flush_gc);
+ if (hooks->free_gc)
+ XESetFreeGC (dpy, dpyinfo->codes->extension, hooks->free_gc);
+ if (hooks->create_font)
+ XESetCreateFont (dpy, dpyinfo->codes->extension, hooks->create_font);
+ if (hooks->free_font)
+ XESetFreeFont (dpy, dpyinfo->codes->extension, hooks->free_font);
+ if (hooks->close_display)
+ XESetCloseDisplay (dpy, dpyinfo->codes->extension,
+ hooks->close_display);
+ if (hooks->error)
+ XESetError (dpy, dpyinfo->codes->extension, hooks->error);
+ if (hooks->error_string)
+ XESetErrorString (dpy, dpyinfo->codes->extension,
+ hooks->error_string);
+ } else if (hooks->close_display) {
+ /* The server doesn't have this extension.
+ * Use a private Xlib-internal extension to hang the close_display
+ * hook on so that the "cache" (extinfo->cur) is properly cleaned.
+ * (XBUG 7955)
+ */
+ XExtCodes *codes = XAddExtension(dpy);
+ if (!codes) {
+ XFree(dpyinfo);
+ return NULL;
+ }
+ XESetCloseDisplay (dpy, codes->extension, hooks->close_display);
+ }
+
+ /*
+ * now, chain it onto the list
+ */
+ _XLockMutex(_Xglobal_lock);
+ dpyinfo->next = extinfo->head;
+ extinfo->head = dpyinfo;
+ extinfo->cur = dpyinfo;
+ extinfo->ndisplays++;
+ _XUnlockMutex(_Xglobal_lock);
+ return dpyinfo;
+}
+
+
+/*
+ * XextRemoveDisplay - remove the indicated display from the extension object
+ */
+int XextRemoveDisplay (extinfo, dpy)
+ XExtensionInfo *extinfo;
+ Display *dpy;
+{
+ XExtDisplayInfo *dpyinfo, *prev;
+
+ /*
+ * locate this display and its back link so that it can be removed
+ */
+ _XLockMutex(_Xglobal_lock);
+ prev = NULL;
+ for (dpyinfo = extinfo->head; dpyinfo; dpyinfo = dpyinfo->next) {
+ if (dpyinfo->display == dpy) break;
+ prev = dpyinfo;
+ }
+ if (!dpyinfo) {
+ _XUnlockMutex(_Xglobal_lock);
+ return 0; /* hmm, actually an error */
+ }
+
+ /*
+ * remove the display from the list; handles going to zero
+ */
+ if (prev)
+ prev->next = dpyinfo->next;
+ else
+ extinfo->head = dpyinfo->next;
+
+ extinfo->ndisplays--;
+ if (dpyinfo == extinfo->cur) extinfo->cur = NULL; /* flush cache */
+ _XUnlockMutex(_Xglobal_lock);
+
+ Xfree ((char *) dpyinfo);
+ return 1;
+}
+
+
+/*
+ * XextFindDisplay - look for a display in this extension; keeps a cache
+ * of the most-recently used for efficiency.
+ */
+XExtDisplayInfo *XextFindDisplay (extinfo, dpy)
+ XExtensionInfo *extinfo;
+ Display *dpy;
+{
+ register XExtDisplayInfo *dpyinfo;
+
+ /*
+ * see if this was the most recently accessed display
+ */
+ if ((dpyinfo = extinfo->cur)&& dpyinfo->display == dpy) return dpyinfo;
+
+
+ /*
+ * look for display in list
+ */
+ _XLockMutex(_Xglobal_lock);
+ for (dpyinfo = extinfo->head; dpyinfo; dpyinfo = dpyinfo->next) {
+ if (dpyinfo->display == dpy) {
+ extinfo->cur = dpyinfo; /* cache most recently used */
+ _XUnlockMutex(_Xglobal_lock);
+ return dpyinfo;
+ }
+ }
+ _XUnlockMutex(_Xglobal_lock);
+
+ return NULL;
+}
+
+
+
+static int _default_exterror (dpy, ext_name, reason)
+ Display *dpy;
+ char *ext_name;
+ char *reason;
+{
+ fprintf (stderr, "Xlib: extension \"%s\" %s on display \"%s\".\n",
+ ext_name, reason, DisplayString(dpy));
+ return 0;
+}
+
+
+/*
+ * XSetExtensionErrorHandler - sets the handler that gets called when a
+ * requested extension is referenced. This should eventually move into Xlib.
+ */
+
+extern int (*_XExtensionErrorFunction)();
+
+#if NeedFunctionPrototypes
+int (*XSetExtensionErrorHandler(
+ int (*handler)(
+#if NeedNestedPrototypes
+ Display*,
+ char *,
+ char *
+#endif
+ )
+))()
+#else
+int (*XSetExtensionErrorHandler(handler))()
+ int (*handler)();
+#endif
+{
+ int (*oldhandler)() = _XExtensionErrorFunction;
+
+ _XExtensionErrorFunction = (handler ? handler :
+ _default_exterror);
+ return oldhandler;
+}
+
+
+/*
+ * XMissingExtension - call the extension error handler
+ */
+#if NeedFunctionPrototypes
+int XMissingExtension (
+ Display *dpy,
+ _Xconst char *ext_name)
+#else
+int XMissingExtension (dpy, ext_name)
+ Display *dpy;
+ char *ext_name;
+#endif
+{
+ int (*func)() = (_XExtensionErrorFunction ?
+ _XExtensionErrorFunction : _default_exterror);
+
+ if (!ext_name) ext_name = X_EXTENSION_UNKNOWN;
+ return (*func) (dpy, ext_name, X_EXTENSION_MISSING);
+}
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