@@ -68,7 +68,7 @@ static struct uevent_notify psy_change = {UEVENT_CHANGE, "power_supply", NULL, uevent_battery_update};
 
 static void uevent_battery_plug()
 {
-    printf("reinitialize batteries after HW change\n");
+    fprintf(stderr, "reinitialize batteries after HW change\n");
     reinit_battery();
 }
 static struct uevent_notify psy_plug = {UEVENT_ADD | UEVENT_REMOVE, "power_supply", NULL, uevent_battery_plug};

@@ -18,16 +18,17 @@ #include "version.h"
 
 void print_usage()
 {
-    printf("Usage: tint2 [OPTION...]\n"
-           "\n"
-           "Options:\n"
-           "  -c path_to_config_file   Loads the configuration file from a\n"
-           "                           custom location.\n"
-           "  -v, --version            Prints version information and exits.\n"
-           "  -h, --help               Display this help and exits.\n"
-           "\n"
-           "For more information, run `man tint2` or visit the project page\n"
-           "<https://gitlab.com/o9000/tint2>.\n");
+    fprintf(stdout,
+            "Usage: tint2 [OPTION...]\n"
+            "\n"
+            "Options:\n"
+            "  -c path_to_config_file   Loads the configuration file from a\n"
+            "                           custom location.\n"
+            "  -v, --version            Prints version information and exits.\n"
+            "  -h, --help               Display this help and exits.\n"
+            "\n"
+            "For more information, run `man tint2` or visit the project page\n"
+            "<https://gitlab.com/o9000/tint2>.\n");
 }
 
 void handle_cli_arguments(int argc, char **argv)
@@ -39,7 +40,7 @@ if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
             print_usage();
             exit(0);
         } else if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--version") == 0) {
-            printf("tint2 version %s\n", VERSION_STRING);
+            fprintf(stdout, "tint2 version %s\n", VERSION_STRING);
             exit(0);
         } else if (strcmp(argv[i], "-c") == 0) {
             if (i + 1 < argc) {

@@ -126,14 +126,14 @@ // lang_index_default is a constant that encodes the Name key without a language
     int lang_index_default = 1;
 #define LANG_DBG 0
     if (LANG_DBG)
-        printf("Languages:");
+        fprintf(stderr, "Languages:");
     for (int i = 0; languages[i]; i++) {
         lang_index_default = i + 1;
         if (LANG_DBG)
-            printf(" %s", languages[i]);
+            fprintf(stderr, " %s", languages[i]);
     }
     if (LANG_DBG)
-        printf("\n");
+        fprintf(stderr, "\n");
     // we currently do not know about any Name key at all, so use an invalid index
     int lang_index_name = lang_index_default + 1;
     int lang_index_generic_name = lang_index_default + 1;
@@ -281,7 +281,7 @@ {
     fprintf(stdout, "\033[1;33m");
     DesktopEntry entry;
     read_desktop_file("/usr/share/applications/firefox.desktop", &entry);
-    printf("Name:%s GenericName:%s Icon:%s Exec:%s\n", entry.name, entry.generic_name, entry.icon, entry.exec);
+    fprintf(stderr, "Name:%s GenericName:%s Icon:%s Exec:%s\n", entry.name, entry.generic_name, entry.icon, entry.exec);
     fprintf(stdout, "\033[0m");
 }
 

@@ -330,19 +330,19 @@ {
     fprintf(stdout, "\033[1;33m");
     IconTheme *theme = load_theme("oxygen");
     if (!theme) {
-        printf("Could not load theme\n");
+        fprintf(stderr, "Could not load theme\n");
         return;
     }
-    printf("Loaded theme: %s\n", theme->name);
+    fprintf(stderr, "Loaded theme: %s\n", theme->name);
     GSList *item = theme->list_inherits;
     while (item != NULL) {
-        printf("Inherits:%s\n", (char *)item->data);
+        fprintf(stderr, "Inherits:%s\n", (char *)item->data);
         item = g_slist_next(item);
     }
     item = theme->list_directories;
     while (item != NULL) {
         IconThemeDir *dir = item->data;
-        printf("Dir:%s Size=%d MinSize=%d MaxSize=%d Threshold=%d Type=%s\n",
+        fprintf(stderr, "Dir:%s Size=%d MinSize=%d MaxSize=%d Threshold=%d Type=%s\n",
                dir->name,
                dir->size,
                dir->min_size,
@@ -623,10 +623,10 @@ file_name[0] = 0;
                     // filename = directory/$(themename)/subdirectory/iconname.extension
                     sprintf(file_name, "%s/%s/%s/%s%s", base_name, theme_name, dir_name, icon_name, extension);
                     if (debug_icons)
-                        printf("Checking %s\n", file_name);
+                        fprintf(stderr, "Checking %s\n", file_name);
                     if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                         if (debug_icons)
-                            printf("Found potential match: %s\n", file_name);
+                            fprintf(stderr, "Found potential match: %s\n", file_name);
                         // Closest match
                         if (directory_size_distance((IconThemeDir *)dir->data, size) < minimal_size &&
                             (!best_file_theme ? 1 : theme == best_file_theme)) {
@@ -638,7 +638,7 @@ best_file_name = strdup(file_name);
                             minimal_size = directory_size_distance((IconThemeDir *)dir->data, size);
                             best_file_theme = theme;
                             if (debug_icons)
-                                printf("best_file_name = %s; minimal_size = %d\n", best_file_name, minimal_size);
+                                fprintf(stderr, "best_file_name = %s; minimal_size = %d\n", best_file_name, minimal_size);
                         }
                         // Next larger match
                         if (((IconThemeDir *)dir->data)->size >= size &&
@@ -652,7 +652,7 @@ next_larger = strdup(file_name);
                             next_larger_size = ((IconThemeDir *)dir->data)->size;
                             next_larger_theme = theme;
                             if (debug_icons)
-                                printf("next_larger = %s; next_larger_size = %d\n", next_larger, next_larger_size);
+                                fprintf(stderr, "next_larger = %s; next_larger_size = %d\n", next_larger, next_larger_size);
                         }
                     }
                 }
@@ -683,10 +683,10 @@ file_name = calloc(strlen(base_name) + strlen(icon_name) + strlen(extension) + 100, 1);
                 // filename = directory/iconname.extension
                 sprintf(file_name, "%s/%s%s", base_name, icon_name, extension);
                 if (debug_icons)
-                    printf("Checking %s\n", file_name);
+                    fprintf(stderr, "Checking %s\n", file_name);
                 if (g_file_test(file_name, G_FILE_TEST_EXISTS)) {
                     if (debug_icons)
-                        printf("Found %s\n", file_name);
+                        fprintf(stderr, "Found %s\n", file_name);
                     g_slist_free(extensions);
                     return file_name;
                 } else {

@@ -297,7 +297,7 @@ i++;
         launcherIcon->y = posy;
         launcherIcon->x = posx;
         launcher_icon_on_change_layout(launcherIcon);
-        // printf("launcher %d : %d,%d\n", i, posx, posy);
+        // fprintf(stderr, "launcher %d : %d,%d\n", i, posx, posy);
         if (panel_horizontal) {
             if (i % icons_per_column) {
                 posy += launcher->icon_size + launcher->area.paddingx;

@@ -420,7 +420,7 @@ 
     check_manager_window(client);
 
     if (client->manager_window == None) {
-        printf("No XSETTINGS manager, tint2 uses config option 'launcher_icon_theme'.\n");
+        fprintf(stderr, "No XSETTINGS manager, tint2 uses config option 'launcher_icon_theme'.\n");
         free(client);
         return NULL;
     } else {

@@ -256,7 +256,7 @@ }
             }
             return;
         }
-        // printf("atom root_win = %s, %s\n", XGetAtomName(server.display, at), task->title);
+        // fprintf(stderr, "atom root_win = %s, %s\n", XGetAtomName(server.display, at), task->title);
 
         // Window title changed
         if (at == server.atom._NET_WM_VISIBLE_NAME || at == server.atom._NET_WM_NAME || at == server.atom.WM_NAME) {
@@ -305,7 +305,7 @@ }
         // Window desktop changed
         else if (at == server.atom._NET_WM_DESKTOP) {
             int desktop = get_window_desktop(win);
-            // printf("  Window desktop changed %d, %d\n", task->desktop, desktop);
+            // fprintf(stderr, "  Window desktop changed %d, %d\n", task->desktop, desktop);
             // bug in windowmaker : send unecessary 'desktop changed' when focus changed
             if (desktop != task->desktop) {
                 task_update_desktop(task);

@@ -209,7 +209,7 @@ memcpy(&panels[i], &panel_config, sizeof(Panel));
     }
 
     fprintf(stderr,
-            "tint2 : nb monitor %d, nb monitor used %d, nb desktop %d\n",
+            "tint2 : nb monitors %d, nb monitors used %d, nb desktops %d\n",
             server.num_monitors,
             num_panels,
             server.num_desktops);
@@ -289,7 +289,7 @@ if (!server.gc) {
             XGCValues gcv;
             server.gc = XCreateGC(server.display, p->main_win, 0, &gcv);
         }
-        // printf("panel %d : %d, %d, %d, %d\n", i, p->posx, p->posy, p->area.width, p->area.height);
+        // fprintf(stderr, "panel %d : %d, %d, %d, %d\n", i, p->posx, p->posy, p->area.width, p->area.height);
         set_panel_properties(p);
         set_panel_background(p);
         if (!snapshot_path) {
@@ -322,7 +322,7 @@ panel->area.width = (server.monitors[panel->monitor].width - panel->marginx) * panel->area.width / 100;
         if (panel->fractional_height)
             panel->area.height = (server.monitors[panel->monitor].height - panel->marginy) * panel->area.height / 100;
         if (panel->area.bg->border.radius > panel->area.height / 2) {
-            printf("panel_background_id rounded is too big... please fix your tint2rc\n");
+            fprintf(stderr, "panel_background_id rounded is too big... please fix your tint2rc\n");
             g_array_append_val(backgrounds, *panel->area.bg);
             panel->area.bg = &g_array_index(backgrounds, Background, backgrounds->len - 1);
             panel->area.bg->border.radius = panel->area.height / 2;
@@ -348,7 +348,7 @@ else
             panel->area.width = old_panel_height;
 
         if (panel->area.bg->border.radius > panel->area.width / 2) {
-            printf("panel_background_id rounded is too big... please fix your tint2rc\n");
+            fprintf(stderr, "panel_background_id rounded is too big... please fix your tint2rc\n");
             g_array_append_val(backgrounds, *panel->area.bg);
             panel->area.bg = &g_array_index(backgrounds, Background, backgrounds->len - 1);
             panel->area.bg->border.radius = panel->area.width / 2;
@@ -401,7 +401,7 @@ } else {
         panel->hidden_width = panel->area.width - diff;
         panel->hidden_height = panel->area.height;
     }
-    // printf("panel : posx %d, posy %d, width %d, height %d\n", panel->posx, panel->posy, panel->area.width,
+    // fprintf(stderr, "panel : posx %d, posy %d, width %d, height %d\n", panel->posx, panel->posy, panel->area.width,
     // panel->area.height);
 }
 
@@ -416,7 +416,7 @@ {
     Panel *panel = (Panel *)obj;
     relayout_with_constraint(&panel->area, 0);
 
-    // printf("resize_panel\n");
+    // fprintf(stderr, "resize_panel\n");
     if (taskbar_mode != MULTI_DESKTOP && taskbar_enabled) {
         // propagate width/height on hidden taskbar
         int width = panel->taskbar[server.desktop].area.width;

@@ -425,14 +425,14 @@ RROutput primary_output = XRRGetOutputPrimary(server.display, server.root_win);
 
         if (res && res->ncrtc >= num_monitors) {
             // use xrandr to identify monitors (does not work with proprietery nvidia drivers)
-            printf("xRandr: Found crtc's: %d\n", res->ncrtc);
+            fprintf(stderr, "xRandr: Found crtc's: %d\n", res->ncrtc);
             server.monitors = calloc(res->ncrtc, sizeof(Monitor));
             num_monitors = 0;
             for (int i = 0; i < res->ncrtc; ++i) {
                 XRRCrtcInfo *crtc_info = XRRGetCrtcInfo(server.display, res, res->crtcs[i]);
                 // Ignore empty crtc
                 if (!crtc_info->width || !crtc_info->height) {
-                    printf("xRandr: crtc %d seems disabled\n", i);
+                    fprintf(stderr, "xRandr: crtc %d seems disabled\n", i);
                     XRRFreeCrtcInfo(crtc_info);
                     continue;
                 }
@@ -445,7 +445,7 @@ server.monitors[i_monitor].height = crtc_info->height;
                 server.monitors[i_monitor].names = calloc((crtc_info->noutput + 1), sizeof(gchar *));
                 for (int j = 0; j < crtc_info->noutput; ++j) {
                     XRROutputInfo *output_info = XRRGetOutputInfo(server.display, res, crtc_info->outputs[j]);
-                    printf("xRandr: Linking output %s with crtc %d\n", output_info->name, i);
+                    fprintf(stderr, "xRandr: Linking output %s with crtc %d\n", output_info->name, i);
                     server.monitors[i_monitor].names[j] = g_strdup(output_info->name);
                     XRRFreeOutputInfo(output_info);
                     server.monitors[i_monitor].primary = crtc_info->outputs[j] == primary_output;
@@ -702,14 +702,14 @@ XChangeWindowAttributes(server.display, server.composite_manager, CWEventMask, &attrs);
 
         server.real_transparency = TRUE;
         server.depth = 32;
-        printf("real transparency on... depth: %d\n", server.depth);
+        fprintf(stderr, "real transparency on... depth: %d\n", server.depth);
         server.colormap = XCreateColormap(server.display, server.root_win, visual, AllocNone);
         server.visual = visual;
     } else {
         // no composite manager or snapshot mode => fake transparency
         server.real_transparency = FALSE;
         server.depth = DefaultDepth(server.display, server.screen);
-        printf("real transparency off.... depth: %d\n", server.depth);
+        fprintf(stderr, "real transparency off.... depth: %d\n", server.depth);
         server.colormap = DefaultColormap(server.display, server.screen);
         server.visual = DefaultVisual(server.display, server.screen);
     }
@@ -732,7 +732,7 @@ // icewm doesn't open under the mouse.
     // and xfce doesn't open at all.
     e->xbutton.x = e->xbutton.x_root;
     e->xbutton.y = e->xbutton.y_root;
-    // printf("**** %d, %d\n", e->xbutton.x, e->xbutton.y);
+    // fprintf(stderr, "**** %d, %d\n", e->xbutton.x, e->xbutton.y);
     // XSetInputFocus(server.display, e->xbutton.window, RevertToParent, e->xbutton.time);
     XSendEvent(server.display, e->xbutton.window, False, ButtonPressMask, e);
 }

@@ -198,7 +198,7 @@ Window win = task->win;
 
     // free title and icon just for the first task
     // even with task_on_all_desktop and with task_on_all_panel
-    // printf("remove_task %s %d\n", task->title, task->desktop);
+    // fprintf(stderr, "remove_task %s %d\n", task->title, task->desktop);
     if (task->title)
         free(task->title);
     task_remove_icon(task);
@@ -591,7 +591,7 @@ active_task = NULL;
     }
 
     Window w1 = get_active_window();
-    // printf("Change active task %ld\n", w1);
+    // fprintf(stderr, "Change active task %ld\n", w1);
 
     if (w1) {
         if (!get_task_buttons(w1)) {

@@ -267,7 +267,7 @@ for (int j = 0; j < TASK_STATE_COUNT; ++j) {
         if (!panel->g_task.background[j])
             panel->g_task.background[j] = &g_array_index(backgrounds, Background, 0);
         if (panel->g_task.background[j]->border.radius > panel->g_task.area.height / 2) {
-            printf("task%sbackground_id has a too large rounded value. Please fix your tint2rc\n",
+            fprintf(stderr, "task%sbackground_id has a too large rounded value. Please fix your tint2rc\n",
                    j == 0 ? "_" : j == 1 ? "_active_" : j == 2 ? "_iconified_" : "_urgent_");
             g_array_append_val(backgrounds, *panel->g_task.background[j]);
             panel->g_task.background[j] = &g_array_index(backgrounds, Background, backgrounds->len - 1);
@@ -432,7 +432,7 @@ {
     Taskbar *taskbar = (Taskbar *)obj;
     Panel *panel = (Panel *)taskbar->area.panel;
 
-    // printf("resize_taskbar %d %d\n", taskbar->area.posx, taskbar->area.posy);
+    // fprintf(stderr, "resize_taskbar %d %d\n", taskbar->area.posx, taskbar->area.posy);
     if (panel_horizontal) {
         relayout_with_constraint(&taskbar->area, panel->g_task.maximum_width);
 

@@ -1839,7 +1839,7 @@ -1);
             if (pixbuf)
                 g_object_unref(pixbuf);
         } else {
-            printf("Could not load %s\n", file);
+            fprintf(stderr, "Could not load %s\n", file);
             GdkPixbuf *pixbuf = load_icon(DEFAULT_ICON);
             GtkTreeIter iter;
             gtk_list_store_append(store, &iter);
@@ -1897,7 +1897,7 @@ process_events();
 
     DesktopEntry *entry = calloc(1, sizeof(DesktopEntry));
     if (!read_desktop_file(file, entry))
-        printf("Could not load %s\n", file);
+        fprintf(stderr, "Could not load %s\n", file);
     if (entry->hidden_from_menus) {
         free(entry);
         return;

@@ -981,7 +981,7 @@ }
 
 void config_save_file(const char *path)
 {
-    printf("config_save_file : %s\n", path);
+    fprintf(stderr, "config_save_file : %s\n", path);
 
     FILE *fp;
     if ((fp = fopen(path, "w+t")) == NULL)

@@ -223,7 +223,7 @@ }
 
     while ((nb = fread(buffer, 1, sizeof(buffer), file_src)) > 0) {
         if (nb != fwrite(buffer, 1, nb, file_dest)) {
-            printf("Error while copying file %s to %s\n", path_src, path_dest);
+            fprintf(stderr, "Error while copying file %s to %s\n", path_src, path_dest);
         }
     }
 
@@ -931,7 +931,7 @@ pango_layout_get_pixel_extents(layout, &rect_ink, &rect);
     *height_ink = rect_ink.height;
     *height = rect.height;
     *width = rect.width;
-    // printf("dimension : %d - %d\n", rect_ink.height, rect.height);
+    // fprintf(stderr, "dimension : %d - %d\n", rect_ink.height, rect.height);
 
     g_object_unref(layout);
     cairo_destroy(c);

@@ -194,7 +194,7 @@ fprintf(stderr, "Bind failed\n");
         return -1;
     }
 
-    printf("Kernel uevent interface initialized...\n");
+    fprintf(stderr, "Kernel uevent interface initialized...\n");
 
     return uevent_fd;
 }