Fix segfaults

Take care of the return code from get_atom_longs().
Free atoms correctly.

diff --git a/pager.c b/pager.c
index e7aa43a..4d99ae3 100644 (file)
--- a/pager.c
+++ b/pager.c
@@ -61,7 +61,7 @@ void setup_pager() {
   long states = { skip_pager_state };
   char buffer[16];
 
-  XChangeProperty(DADisplay, DAWindow, client_state_atom, XA_ATOM, 32, PropModeAppend, &states, 1);
+  XChangeProperty(DADisplay, DAWindow, client_state_atom, XA_ATOM, 32, PropModeAppend, (unsigned char *) &states, 1);
 
   if (desktop >= 0) {
     if (snprintf(buffer, sizeof(buffer), "Desktop %d", desktop + 1) < 0) return;
@@ -72,24 +72,27 @@ void setup_pager() {
   XStoreName(DADisplay, DAWindow, buffer);
 }
 
-void get_atom_longs(Atom atom, Atom type, Window window, long **data, unsigned long *num_items) {
+int get_atom_longs(Atom atom, Atom type, Window window, long **data, unsigned long *num_items) {
   Atom actual;
   int format;
   unsigned long num_bytes;
 
-  XGetWindowProperty(DADisplay, window, atom, 0, 8192, False, type, &actual, &format, num_items, &num_bytes, (unsigned char **) data);
+  return XGetWindowProperty(DADisplay, window, atom, 0, 8192, False, type, &actual, &format, num_items, &num_bytes, (unsigned char **) data);
 }
 
-long get_atom_long(Atom atom, Atom type, Window window) {
+int get_atom_long(Atom atom, Atom type, Window window, long *ret) {
   long *data;
-  long ret = 0;
+  int status;
   unsigned long num_items;
 
-  get_atom_longs(atom, type, window, &data, &num_items);
-  if (num_items) ret = data[0];
+  *ret = 0;
+
+  status = get_atom_longs(atom, type, window, &data, &num_items);
+  if (status != Success) return status;
+  if (num_items) *ret = data[0];
   XFree(data);
 
-  return ret;
+  return status;
 }
 
 void check_support() {
@@ -137,11 +140,11 @@ void enumerate_clients(client_t ***clients, unsigned long *num_clients, unsigned
   scale = (double) root_width / (double) dockapp_attr.width;
   aspect = (double) root_height / (double) dockapp_attr.height;
 
-  *active_window = get_atom_long(active_window_atom, XA_WINDOW, dockapp_attr.root);
-  *active_desktop = get_atom_long(current_desktop_atom, XA_CARDINAL, DefaultRootWindow(DADisplay));
+  if (get_atom_long(active_window_atom, XA_WINDOW, dockapp_attr.root, (long *) active_window) != Success) *active_window = 0;
+  if (get_atom_long(current_desktop_atom, XA_CARDINAL, DefaultRootWindow(DADisplay), (long *) active_desktop) != Success) *active_desktop = 0;
 
   if (client_list_supported) {
-    get_atom_longs(client_list_atom, XA_WINDOW, dockapp_attr.root, &data, num_clients);
+    if (get_atom_longs(client_list_atom, XA_WINDOW, dockapp_attr.root, &data, num_clients) != Success) XFree(data);
   }
   else {
     XQueryTree(DADisplay, dockapp_attr.root, &qroot, &qparent, &wins, (unsigned int *) num_clients);
@@ -165,7 +168,7 @@ void enumerate_clients(client_t ***clients, unsigned long *num_clients, unsigned
     else client = XmuClientWindow(DADisplay, wins[i]);
 
     /* Check the window is on our desktop (or all desktops). */
-    client_desktop = get_atom_long(client_desktop_atom, XA_CARDINAL, client);
+    if (get_atom_long(client_desktop_atom, XA_CARDINAL, client, &client_desktop) != Success) continue;
     if (desktop > -1) {
       if (client_desktop != desktop && client_desktop != -1) continue;
     }
@@ -179,12 +182,15 @@ void enumerate_clients(client_t ***clients, unsigned long *num_clients, unsigned
 
     /* Make sure it isn't hidden or shaded. */
     draw = 1;
-    get_atom_longs(client_state_atom, XA_ATOM, client, &states, &num_states);
-    for (j = 0; j < num_states; j++) {
-      if (states[j] == shaded_state) height = 3.0 * scale;
-      if (states[j] == skip_pager_state) draw = 0;
-      if (states[j] == hidden_state) draw = 0;
+    if (get_atom_longs(client_state_atom, XA_ATOM, client, &states, &num_states) == Success) {
+      for (j = 0; j < num_states; j++) {
+        if (states[j] == shaded_state) height = 3.0 * scale;
+        if (states[j] == skip_pager_state) draw = 0;
+        if (states[j] == hidden_state) draw = 0;
+      }
+      XFree(states);
     }
+    else continue;
     if (! draw) continue;
 
     (*clients)[i]->window = client;
@@ -440,9 +446,9 @@ int main(int argc, char **argv) {
 
   check_support();
 
-  num_desktops = get_atom_long(num_desktops_atom, XA_CARDINAL, DefaultRootWindow(DADisplay));
+  if (get_atom_long(num_desktops_atom, XA_CARDINAL, DefaultRootWindow(DADisplay), &num_desktops) != Success) num_desktops = 1;
   if (desktop == 0) {
-    desktop = get_atom_long(current_desktop_atom, XA_CARDINAL, DefaultRootWindow(DADisplay));
+    if (get_atom_long(current_desktop_atom, XA_CARDINAL, DefaultRootWindow(DADisplay), (long *) &desktop) != Success) desktop = 0;
   }
   else if (desktop < 0) desktop = -1;
   else if (desktop-- > num_desktops) {