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-rw-r--r--xsettings/xsettings-client.c577
1 files changed, 577 insertions, 0 deletions
diff --git a/xsettings/xsettings-client.c b/xsettings/xsettings-client.c
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+/*
+ * Copyright © 2001 Red Hat, Inc.
+ *
+ * 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, and that the name of Red Hat not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. Red Hat makes no representations about the
+ * suitability of this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ *
+ * RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL RED HAT
+ * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Owen Taylor, Red Hat, Inc.
+ */
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <X11/Xlib.h>
+#include <X11/Xmd.h> /* For CARD16 */
+
+#include "xsettings-client.h"
+
+struct _XSettingsClient
+{
+ Display *display;
+ int screen;
+ XSettingsNotifyFunc notify;
+ XSettingsWatchFunc watch;
+ void *cb_data;
+
+ XSettingsGrabFunc grab;
+ XSettingsGrabFunc ungrab;
+
+ Window manager_window;
+ Atom manager_atom;
+ Atom selection_atom;
+ Atom xsettings_atom;
+
+ XSettingsList *settings;
+};
+
+static void
+notify_changes (XSettingsClient *client,
+ XSettingsList *old_list)
+{
+ XSettingsList *old_iter = old_list;
+ XSettingsList *new_iter = client->settings;
+
+ if (!client->notify)
+ return;
+
+ while (old_iter || new_iter)
+ {
+ int cmp;
+
+ if (old_iter && new_iter)
+ cmp = strcmp (old_iter->setting->name, new_iter->setting->name);
+ else if (old_iter)
+ cmp = -1;
+ else
+ cmp = 1;
+
+ if (cmp < 0)
+ {
+ client->notify (old_iter->setting->name,
+ XSETTINGS_ACTION_DELETED,
+ NULL,
+ client->cb_data);
+ }
+ else if (cmp == 0)
+ {
+ if (!xsettings_setting_equal (old_iter->setting,
+ new_iter->setting))
+ client->notify (old_iter->setting->name,
+ XSETTINGS_ACTION_CHANGED,
+ new_iter->setting,
+ client->cb_data);
+ }
+ else
+ {
+ client->notify (new_iter->setting->name,
+ XSETTINGS_ACTION_NEW,
+ new_iter->setting,
+ client->cb_data);
+ }
+
+ if (old_iter)
+ old_iter = old_iter->next;
+ if (new_iter)
+ new_iter = new_iter->next;
+ }
+}
+
+static int
+ignore_errors (Display *display, XErrorEvent *event)
+{
+ return True;
+}
+
+static char local_byte_order = '\0';
+
+#define BYTES_LEFT(buffer) ((buffer)->data + (buffer)->len - (buffer)->pos)
+
+static XSettingsResult
+fetch_card16 (XSettingsBuffer *buffer,
+ CARD16 *result)
+{
+ CARD16 x;
+
+ if (BYTES_LEFT (buffer) < 2)
+ return XSETTINGS_ACCESS;
+
+ x = *(CARD16 *)buffer->pos;
+ buffer->pos += 2;
+
+ if (buffer->byte_order == local_byte_order)
+ *result = x;
+ else
+ *result = (x << 8) | (x >> 8);
+
+ return XSETTINGS_SUCCESS;
+}
+
+static XSettingsResult
+fetch_ushort (XSettingsBuffer *buffer,
+ unsigned short *result)
+{
+ CARD16 x;
+ XSettingsResult r;
+
+ r = fetch_card16 (buffer, &x);
+ if (r == XSETTINGS_SUCCESS)
+ *result = x;
+
+ return r;
+}
+
+static XSettingsResult
+fetch_card32 (XSettingsBuffer *buffer,
+ CARD32 *result)
+{
+ CARD32 x;
+
+ if (BYTES_LEFT (buffer) < 4)
+ return XSETTINGS_ACCESS;
+
+ x = *(CARD32 *)buffer->pos;
+ buffer->pos += 4;
+
+ if (buffer->byte_order == local_byte_order)
+ *result = x;
+ else
+ *result = (x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24);
+
+ return XSETTINGS_SUCCESS;
+}
+
+static XSettingsResult
+fetch_card8 (XSettingsBuffer *buffer,
+ CARD8 *result)
+{
+ if (BYTES_LEFT (buffer) < 1)
+ return XSETTINGS_ACCESS;
+
+ *result = *(CARD8 *)buffer->pos;
+ buffer->pos += 1;
+
+ return XSETTINGS_SUCCESS;
+}
+
+#define XSETTINGS_PAD(n,m) ((n + m - 1) & (~(m-1)))
+
+static XSettingsList *
+parse_settings (unsigned char *data,
+ size_t len)
+{
+ XSettingsBuffer buffer;
+ XSettingsResult result = XSETTINGS_SUCCESS;
+ XSettingsList *settings = NULL;
+ CARD32 serial;
+ CARD32 n_entries;
+ CARD32 i;
+ XSettingsSetting *setting = NULL;
+
+ local_byte_order = xsettings_byte_order ();
+
+ buffer.pos = buffer.data = data;
+ buffer.len = len;
+
+ result = fetch_card8 (&buffer, (char *)&buffer.byte_order);
+ if (buffer.byte_order != MSBFirst &&
+ buffer.byte_order != LSBFirst)
+ {
+ fprintf (stderr, "Invalid byte order in XSETTINGS property\n");
+ result = XSETTINGS_FAILED;
+ goto out;
+ }
+
+ buffer.pos += 3;
+
+ result = fetch_card32 (&buffer, &serial);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ result = fetch_card32 (&buffer, &n_entries);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ for (i = 0; i < n_entries; i++)
+ {
+ CARD8 type;
+ CARD16 name_len;
+ CARD32 v_int;
+ size_t pad_len;
+
+ result = fetch_card8 (&buffer, &type);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ buffer.pos += 1;
+
+ result = fetch_card16 (&buffer, &name_len);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ pad_len = XSETTINGS_PAD(name_len, 4);
+ if (BYTES_LEFT (&buffer) < pad_len)
+ {
+ result = XSETTINGS_ACCESS;
+ goto out;
+ }
+
+ setting = malloc (sizeof *setting);
+ if (!setting)
+ {
+ result = XSETTINGS_NO_MEM;
+ goto out;
+ }
+ setting->type = XSETTINGS_TYPE_INT; /* No allocated memory */
+
+ setting->name = malloc (name_len + 1);
+ if (!setting->name)
+ {
+ result = XSETTINGS_NO_MEM;
+ goto out;
+ }
+
+ memcpy (setting->name, buffer.pos, name_len);
+ setting->name[name_len] = '\0';
+ buffer.pos += pad_len;
+
+ result = fetch_card32 (&buffer, &v_int);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+ setting->last_change_serial = v_int;
+
+ switch (type)
+ {
+ case XSETTINGS_TYPE_INT:
+ result = fetch_card32 (&buffer, &v_int);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ setting->data.v_int = (INT32)v_int;
+ break;
+ case XSETTINGS_TYPE_STRING:
+ result = fetch_card32 (&buffer, &v_int);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ pad_len = XSETTINGS_PAD (v_int, 4);
+ if (v_int + 1 == 0 || /* Guard against wrap-around */
+ BYTES_LEFT (&buffer) < pad_len)
+ {
+ result = XSETTINGS_ACCESS;
+ goto out;
+ }
+
+ setting->data.v_string = malloc (v_int + 1);
+ if (!setting->data.v_string)
+ {
+ result = XSETTINGS_NO_MEM;
+ goto out;
+ }
+
+ memcpy (setting->data.v_string, buffer.pos, v_int);
+ setting->data.v_string[v_int] = '\0';
+ buffer.pos += pad_len;
+
+ break;
+ case XSETTINGS_TYPE_COLOR:
+ result = fetch_ushort (&buffer, &setting->data.v_color.red);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+ result = fetch_ushort (&buffer, &setting->data.v_color.green);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+ result = fetch_ushort (&buffer, &setting->data.v_color.blue);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+ result = fetch_ushort (&buffer, &setting->data.v_color.alpha);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ break;
+ default:
+ /* Quietly ignore unknown types */
+ break;
+ }
+
+ setting->type = type;
+
+ result = xsettings_list_insert (&settings, setting);
+ if (result != XSETTINGS_SUCCESS)
+ goto out;
+
+ setting = NULL;
+ }
+
+ out:
+
+ if (result != XSETTINGS_SUCCESS)
+ {
+ switch (result)
+ {
+ case XSETTINGS_NO_MEM:
+ fprintf(stderr, "Out of memory reading XSETTINGS property\n");
+ break;
+ case XSETTINGS_ACCESS:
+ fprintf(stderr, "Invalid XSETTINGS property (read off end)\n");
+ break;
+ case XSETTINGS_DUPLICATE_ENTRY:
+ fprintf (stderr, "Duplicate XSETTINGS entry for '%s'\n", setting->name);
+ case XSETTINGS_FAILED:
+ case XSETTINGS_SUCCESS:
+ case XSETTINGS_NO_ENTRY:
+ break;
+ }
+
+ if (setting)
+ xsettings_setting_free (setting);
+
+ xsettings_list_free (settings);
+ settings = NULL;
+
+ }
+
+ return settings;
+}
+
+static void
+read_settings (XSettingsClient *client)
+{
+ Atom type;
+ int format;
+ unsigned long n_items;
+ unsigned long bytes_after;
+ unsigned char *data;
+ int result;
+
+ int (*old_handler) (Display *, XErrorEvent *);
+
+ XSettingsList *old_list = client->settings;
+
+ client->settings = NULL;
+
+ if (client->manager_window)
+ {
+ old_handler = XSetErrorHandler (ignore_errors);
+ result = XGetWindowProperty (client->display, client->manager_window,
+ client->xsettings_atom, 0, LONG_MAX,
+ False, client->xsettings_atom,
+ &type, &format, &n_items, &bytes_after, &data);
+ XSetErrorHandler (old_handler);
+
+ if (result == Success && type != None)
+ {
+ if (type != client->xsettings_atom)
+ {
+ fprintf (stderr, "Invalid type for XSETTINGS property");
+ }
+ else if (format != 8)
+ {
+ fprintf (stderr, "Invalid format for XSETTINGS property %d", format);
+ }
+ else
+ client->settings = parse_settings (data, n_items);
+
+ XFree (data);
+ }
+ }
+
+ notify_changes (client, old_list);
+ xsettings_list_free (old_list);
+}
+
+static void
+add_events (Display *display,
+ Window window,
+ long mask)
+{
+ XWindowAttributes attr;
+
+ XGetWindowAttributes (display, window, &attr);
+ XSelectInput (display, window, attr.your_event_mask | mask);
+}
+
+static void
+check_manager_window (XSettingsClient *client)
+{
+ if (client->manager_window && client->watch)
+ client->watch (client->manager_window, False, 0, client->cb_data);
+
+ if (client->grab)
+ client->grab (client->display);
+ else
+ XGrabServer (client->display);
+
+ client->manager_window = XGetSelectionOwner (client->display,
+ client->selection_atom);
+ if (client->manager_window)
+ XSelectInput (client->display, client->manager_window,
+ PropertyChangeMask | StructureNotifyMask);
+
+ if (client->ungrab)
+ client->ungrab (client->display);
+ else
+ XUngrabServer (client->display);
+
+ XFlush (client->display);
+
+ if (client->manager_window && client->watch)
+ client->watch (client->manager_window, True,
+ PropertyChangeMask | StructureNotifyMask,
+ client->cb_data);
+
+ read_settings (client);
+}
+
+XSettingsClient *
+xsettings_client_new (Display *display,
+ int screen,
+ XSettingsNotifyFunc notify,
+ XSettingsWatchFunc watch,
+ void *cb_data)
+{
+ XSettingsClient *client;
+ char buffer[256];
+ char *atom_names[3];
+ Atom atoms[3];
+
+ client = malloc (sizeof *client);
+ if (!client)
+ return NULL;
+
+ client->display = display;
+ client->screen = screen;
+ client->notify = notify;
+ client->watch = watch;
+ client->cb_data = cb_data;
+ client->grab = NULL;
+ client->ungrab = NULL;
+
+ client->manager_window = None;
+ client->settings = NULL;
+
+ sprintf(buffer, "_XSETTINGS_S%d", screen);
+ atom_names[0] = buffer;
+ atom_names[1] = "_XSETTINGS_SETTINGS";
+ atom_names[2] = "MANAGER";
+
+ XInternAtoms (display, atom_names, 3, False, atoms);
+
+ client->selection_atom = atoms[0];
+ client->xsettings_atom = atoms[1];
+ client->manager_atom = atoms[2];
+
+ /* Select on StructureNotify so we get MANAGER events
+ */
+ add_events (display, RootWindow (display, screen), StructureNotifyMask);
+
+ if (client->watch)
+ client->watch (RootWindow (display, screen), True, StructureNotifyMask,
+ client->cb_data);
+
+ check_manager_window (client);
+
+ return client;
+}
+
+void
+xsettings_client_set_grab_func (XSettingsClient *client,
+ XSettingsGrabFunc grab)
+{
+ client->grab = grab;
+}
+
+void
+xsettings_client_set_ungrab_func (XSettingsClient *client,
+ XSettingsGrabFunc ungrab)
+{
+ client->ungrab = ungrab;
+}
+
+void
+xsettings_client_destroy (XSettingsClient *client)
+{
+ if (client->watch)
+ client->watch (RootWindow (client->display, client->screen),
+ False, 0, client->cb_data);
+ if (client->manager_window && client->watch)
+ client->watch (client->manager_window, False, 0, client->cb_data);
+
+ xsettings_list_free (client->settings);
+ free (client);
+}
+
+XSettingsResult
+xsettings_client_get_setting (XSettingsClient *client,
+ const char *name,
+ XSettingsSetting **setting)
+{
+ XSettingsSetting *search = xsettings_list_lookup (client->settings, name);
+ if (search)
+ {
+ *setting = xsettings_setting_copy (search);
+ return *setting ? XSETTINGS_SUCCESS : XSETTINGS_NO_MEM;
+ }
+ else
+ return XSETTINGS_NO_ENTRY;
+}
+
+Bool
+xsettings_client_process_event (XSettingsClient *client,
+ XEvent *xev)
+{
+ /* The checks here will not unlikely cause us to reread
+ * the properties from the manager window a number of
+ * times when the manager changes from A->B. But manager changes
+ * are going to be pretty rare.
+ */
+ if (xev->xany.window == RootWindow (client->display, client->screen))
+ {
+ if (xev->xany.type == ClientMessage &&
+ xev->xclient.message_type == client->manager_atom &&
+ xev->xclient.data.l[1] == client->selection_atom)
+ {
+ check_manager_window (client);
+ return True;
+ }
+ }
+ else if (xev->xany.window == client->manager_window)
+ {
+ if (xev->xany.type == DestroyNotify)
+ {
+ check_manager_window (client);
+ return True;
+ }
+ else if (xev->xany.type == PropertyNotify)
+ {
+ read_settings (client);
+ return True;
+ }
+ }
+
+ return False;
+}