sync code with last improvements from OpenBSD
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277
lib/libXext/src/extutil.c
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277
lib/libXext/src/extutil.c
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/*
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*
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Copyright 1989, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*
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* Author: Jim Fulton, MIT X Consortium
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*
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*
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* Xlib Extension-Writing Utilities
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*
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* This package contains utilities for writing the client API for various
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* protocol extensions. THESE INTERFACES ARE NOT PART OF THE X STANDARD AND
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* ARE SUBJECT TO CHANGE!
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*
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* Routines include:
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*
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* XextCreateExtension called once per extension
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* XextDestroyExtension if no longer using extension
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* XextAddDisplay add another display
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* XextRemoveDisplay remove a display
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* XextFindDisplay is a display open
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*
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* In addition, the following Xlib-style interfaces are provided:
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*
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* XSetExtensionErrorHandler establish an extension error handler
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* XMissingExtension raise an error about missing ext
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <X11/Xlibint.h>
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#include <X11/extensions/Xext.h>
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#include <X11/extensions/extutil.h>
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#include <X11/extensions/ge.h>
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#include "extutilP.h"
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/*
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* XextCreateExtension - return an extension descriptor containing context
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* information for this extension. This object is passed to all Xext
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* routines.
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*/
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XExtensionInfo *XextCreateExtension (void)
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{
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register XExtensionInfo *info = Xmalloc (sizeof (XExtensionInfo));
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if (info) {
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info->head = NULL;
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info->cur = NULL;
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info->ndisplays = 0;
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}
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return info;
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}
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/*
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* XextDestroyExtension - free memory the given extension descriptor
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*/
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void XextDestroyExtension (XExtensionInfo *info)
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{
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info->head = NULL; /* to catch refs after this */
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info->cur = NULL;
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info->ndisplays = 0;
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XFree (info);
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}
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/*
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* XextAddDisplay - add a display to this extension
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*/
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XExtDisplayInfo *XextAddDisplay (
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XExtensionInfo *extinfo,
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Display *dpy,
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_Xconst char *ext_name,
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XExtensionHooks *hooks,
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int nevents,
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XPointer data)
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{
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XExtDisplayInfo *dpyinfo;
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dpyinfo = Xmalloc (sizeof (XExtDisplayInfo));
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if (!dpyinfo) return NULL;
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dpyinfo->display = dpy;
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dpyinfo->data = data;
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dpyinfo->codes = XInitExtension (dpy, ext_name);
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/*
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* if the server has the extension, then we can initialize the
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* appropriate function vectors
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*/
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if (dpyinfo->codes) {
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int i, j;
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for (i = 0, j = dpyinfo->codes->first_event; i < nevents; i++, j++) {
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XESetWireToEvent (dpy, j, hooks->wire_to_event);
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XESetEventToWire (dpy, j, hooks->event_to_wire);
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}
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/* register extension for XGE */
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if (strcmp(ext_name, GE_NAME))
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xgeExtRegister(dpy, dpyinfo->codes->major_opcode, hooks);
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if (hooks->create_gc)
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XESetCreateGC (dpy, dpyinfo->codes->extension, hooks->create_gc);
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if (hooks->copy_gc)
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XESetCopyGC (dpy, dpyinfo->codes->extension, hooks->copy_gc);
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if (hooks->flush_gc)
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XESetFlushGC (dpy, dpyinfo->codes->extension, hooks->flush_gc);
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if (hooks->free_gc)
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XESetFreeGC (dpy, dpyinfo->codes->extension, hooks->free_gc);
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if (hooks->create_font)
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XESetCreateFont (dpy, dpyinfo->codes->extension, hooks->create_font);
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if (hooks->free_font)
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XESetFreeFont (dpy, dpyinfo->codes->extension, hooks->free_font);
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if (hooks->close_display)
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XESetCloseDisplay (dpy, dpyinfo->codes->extension,
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hooks->close_display);
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if (hooks->error)
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XESetError (dpy, dpyinfo->codes->extension, hooks->error);
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if (hooks->error_string)
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XESetErrorString (dpy, dpyinfo->codes->extension,
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hooks->error_string);
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} else if (hooks->close_display) {
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/* The server doesn't have this extension.
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* Use a private Xlib-internal extension to hang the close_display
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* hook on so that the "cache" (extinfo->cur) is properly cleaned.
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* (XBUG 7955)
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*/
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XExtCodes *codes = XAddExtension(dpy);
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if (!codes) {
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XFree(dpyinfo);
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return NULL;
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}
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XESetCloseDisplay (dpy, codes->extension, hooks->close_display);
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}
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/*
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* now, chain it onto the list
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*/
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_XLockMutex(_Xglobal_lock);
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dpyinfo->next = extinfo->head;
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extinfo->head = dpyinfo;
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extinfo->cur = dpyinfo;
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extinfo->ndisplays++;
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_XUnlockMutex(_Xglobal_lock);
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return dpyinfo;
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}
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/*
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* XextRemoveDisplay - remove the indicated display from the extension object
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*/
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int XextRemoveDisplay (XExtensionInfo *extinfo, Display *dpy)
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{
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XExtDisplayInfo *dpyinfo, *prev;
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/*
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* locate this display and its back link so that it can be removed
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*/
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_XLockMutex(_Xglobal_lock);
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prev = NULL;
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for (dpyinfo = extinfo->head; dpyinfo; dpyinfo = dpyinfo->next) {
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if (dpyinfo->display == dpy) break;
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prev = dpyinfo;
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}
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if (!dpyinfo) {
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_XUnlockMutex(_Xglobal_lock);
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return 0; /* hmm, actually an error */
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}
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/*
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* remove the display from the list; handles going to zero
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*/
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if (prev)
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prev->next = dpyinfo->next;
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else
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extinfo->head = dpyinfo->next;
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extinfo->ndisplays--;
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if (dpyinfo == extinfo->cur) extinfo->cur = NULL; /* flush cache */
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_XUnlockMutex(_Xglobal_lock);
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Xfree (dpyinfo);
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return 1;
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}
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/*
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* XextFindDisplay - look for a display in this extension; keeps a cache
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* of the most-recently used for efficiency.
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*/
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XExtDisplayInfo *XextFindDisplay (XExtensionInfo *extinfo, Display *dpy)
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{
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register XExtDisplayInfo *dpyinfo;
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/*
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* see if this was the most recently accessed display
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*/
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if ((dpyinfo = extinfo->cur)&& dpyinfo->display == dpy) return dpyinfo;
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/*
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* look for display in list
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*/
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_XLockMutex(_Xglobal_lock);
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for (dpyinfo = extinfo->head; dpyinfo; dpyinfo = dpyinfo->next) {
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if (dpyinfo->display == dpy) {
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extinfo->cur = dpyinfo; /* cache most recently used */
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_XUnlockMutex(_Xglobal_lock);
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return dpyinfo;
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}
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}
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_XUnlockMutex(_Xglobal_lock);
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return NULL;
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}
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static int _default_exterror (Display *dpy, _Xconst char *ext_name, _Xconst char *reason)
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{
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fprintf (stderr, "Xlib: extension \"%s\" %s on display \"%s\".\n",
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ext_name, reason, DisplayString(dpy));
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return 0;
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}
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/*
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* XSetExtensionErrorHandler - sets the handler that gets called when a
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* requested extension is referenced. This should eventually move into Xlib.
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*/
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extern XextErrorHandler _XExtensionErrorFunction;
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XextErrorHandler XSetExtensionErrorHandler (XextErrorHandler handler)
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{
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XextErrorHandler oldhandler = _XExtensionErrorFunction;
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_XExtensionErrorFunction = (handler ? handler :
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_default_exterror);
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return oldhandler;
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}
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/*
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* XMissingExtension - call the extension error handler
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*/
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int XMissingExtension (Display *dpy, _Xconst char *ext_name)
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{
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XextErrorHandler func = (_XExtensionErrorFunction ?
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_XExtensionErrorFunction : _default_exterror);
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if (!ext_name) ext_name = X_EXTENSION_UNKNOWN;
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return (*func) (dpy, ext_name, X_EXTENSION_MISSING);
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}
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