diff --git a/src/actions.c b/src/actions.c
index ca575ff..c7ce94b 100644
--- a/src/actions.c
+++ b/src/actions.c
@@ -228,7 +228,7 @@ action_add(unsigned short mod, unsigned char button, KeySym keysym, action_type_
 
     action_t *action;
 
-    if (!action_list || (action = action_find_match(mod, button, keysym)) == NULL) {
+    if (!action_list || !(action = action_find_match(mod, button, keysym))) {
         action = (action_t *) MALLOC(sizeof(action_t));
         action->next = action_list;
         action_list = action;
diff --git a/src/buttons.c b/src/buttons.c
index 3f1374c..1c42d5a 100644
--- a/src/buttons.c
+++ b/src/buttons.c
@@ -193,7 +193,7 @@ bbar_handle_enter_notify(event_t *ev)
 
     REQUIRE_RVAL(XEVENT_IS_MYWIN(ev, &buttonbar->event_data), 0);
 
-    if ((bbar = find_bbar_by_window(ev->xany.window)) == NULL) {
+    if (!(bbar = find_bbar_by_window(ev->xany.window))) {
         return 0;
     }
     bbar_draw(bbar, IMAGE_STATE_SELECTED, 0);
@@ -215,7 +215,7 @@ bbar_handle_leave_notify(event_t *ev)
 
     REQUIRE_RVAL(XEVENT_IS_MYWIN(ev, &buttonbar->event_data), 0);
 
-    if ((bbar = find_bbar_by_window(ev->xany.window)) == NULL) {
+    if (!(bbar = find_bbar_by_window(ev->xany.window))) {
         return 0;
     }
     bbar_draw(bbar, IMAGE_STATE_NORMAL, 0);
@@ -234,7 +234,7 @@ bbar_handle_button_press(event_t *ev)
 
     REQUIRE_RVAL(XEVENT_IS_MYWIN(ev, &buttonbar->event_data), 0);
 
-    if ((bbar = find_bbar_by_window(ev->xany.window)) == NULL) {
+    if (!(bbar = find_bbar_by_window(ev->xany.window))) {
         D_EVENTS((" -> No buttonbar found for this window.\n"));
         return 0;
     }
@@ -326,7 +326,7 @@ bbar_handle_button_release(event_t *ev)
 
     REQUIRE_RVAL(XEVENT_IS_MYWIN(ev, &buttonbar->event_data), 0);
 
-    if ((bbar = find_bbar_by_window(ev->xany.window)) == NULL) {
+    if (!(bbar = find_bbar_by_window(ev->xany.window))) {
         D_EVENTS((" -> No buttonbar found for this window.\n"));
         return 0;
     }
@@ -364,7 +364,7 @@ bbar_handle_motion_notify(event_t *ev)
 
     REQUIRE_RVAL(XEVENT_IS_MYWIN(ev, &buttonbar->event_data), 0);
 
-    if ((bbar = find_bbar_by_window(ev->xany.window)) == NULL) {
+    if (!(bbar = find_bbar_by_window(ev->xany.window))) {
         return 0;
     }
     while (XCheckTypedWindowEvent(Xdisplay, ev->xany.window, MotionNotify, ev));
@@ -392,7 +392,7 @@ bbar_handle_motion_notify(event_t *ev)
 unsigned char
 bbar_dispatch_event(event_t *ev)
 {
-    if (buttonbar->event_data.handlers[ev->type] != NULL) {
+    if (buttonbar->event_data.handlers[ev->type]) {
         return ((buttonbar->event_data.handlers[ev->type]) (ev));
     }
     return (0);
@@ -721,7 +721,7 @@ button_t *find_button_by_index(buttonbar_t *bbar, long idx)
     } else {
         b = bbar->buttons;
     }
-    for (i = 0; (b != NULL) && (i < idx); b = b->next, i++);
+    for (i = 0; (b) && (i < idx); b = b->next, i++);
     return ((i == idx) ? (b) : (NULL));
 }
 
@@ -816,19 +816,19 @@ button_set_action(button_t *button, action_type_t type, char *action)
     switch (type) {
         case ACTION_MENU:
             button->action.menu = find_menu_by_title(menu_list, action);
-            return ((button->action.menu == NULL) ? (0) : (1));
+            return ((!button->action.menu) ? (0) : (1));
             break;
         case ACTION_STRING:
         case ACTION_ECHO:
             button->action.string = (char *) MALLOC(strlen(action) + 2);
             strcpy(button->action.string, action);
             parse_escaped_string(button->action.string);
-            return ((button->action.string == NULL) ? (0) : (1));
+            return ((!button->action.string) ? (0) : (1));
             break;
         case ACTION_SCRIPT:
             button->action.script = (char *) MALLOC(strlen(action) + 2);
             strcpy(button->action.script, action);
-            return ((button->action.script == NULL) ? (0) : (1));
+            return ((!button->action.script) ? (0) : (1));
             break;
         default:
             break;
diff --git a/src/command.c b/src/command.c
index 65fc09f..0f7fdd3 100644
--- a/src/command.c
+++ b/src/command.c
@@ -1330,7 +1330,7 @@ sgi_get_pty(void)
     privileges(INVOKE);
     ptydev = ttydev = _getpty(&fd, O_RDWR | O_NDELAY, 0620, 0);
     privileges(REVERT);
-    return (ptydev == NULL ? -1 : fd);
+    return (!ptydev ? -1 : fd);
 
 }
 #endif
@@ -1411,7 +1411,7 @@ posix_get_pty(void)
             return (-1);
         } else {
             ptydev = ttydev = ptsname(fd);
-            if (ttydev == NULL) {
+            if (!ttydev) {
                 libast_print_error("ptsname(%d) failed:  %s\n", fd, strerror(errno));
                 return (-1);
             }
@@ -1509,7 +1509,7 @@ get_tty(void)
 #endif /* ultrix */
 
     privileges(INVOKE);
-    if (ttydev == NULL) {
+    if (!ttydev) {
         libast_print_error("Slave tty device name is NULL.  Failed to open slave pty.\n");
         exit(EXIT_FAILURE);
     } else if ((fd = open(ttydev, O_RDWR)) < 0) {
@@ -1908,7 +1908,7 @@ init_locale(void)
     locale = setlocale(LC_ALL, "");
     XSetLocaleModifiers("");
     TermWin.fontset = (XFontSet) 0;
-    if ((locale == NULL) || (!XSupportsLocale())) {
+    if ((!locale) || (!XSupportsLocale())) {
         libast_print_warning("Locale not supported; defaulting to portable \"C\" locale.\n");
         locale = setlocale(LC_ALL, "C");
         XSetLocaleModifiers("");
@@ -1956,7 +1956,7 @@ xim_send_spot(void)
     static XPoint oldSpot = { -1, -1 };
     XVaNestedList preedit_attr;
 
-    if (xim_input_context == NULL) {
+    if (!xim_input_context) {
         return;
     }
 
@@ -2045,8 +2045,8 @@ xim_real_init(void)
             *(end + 1) = '\0';
             if (*s) {
                 snprintf(buf, sizeof(buf), "@im=%s", s);
-                if (((p = XSetLocaleModifiers(buf)) != NULL) && (*p)
-                    && ((xim_input_method = XOpenIM(Xdisplay, NULL, NULL, NULL)) != NULL)) {
+                if (((p = XSetLocaleModifiers(buf))) && (*p)
+                    && ((xim_input_method = XOpenIM(Xdisplay, NULL, NULL, NULL)))) {
                     break;
                 }
             }
@@ -2057,20 +2057,20 @@ xim_real_init(void)
     }
 
     /* try with XMODIFIERS env. var. */
-    if (xim_input_method == NULL && getenv("XMODIFIERS") && (p = XSetLocaleModifiers("")) != NULL && *p) {
+    if (!xim_input_method && getenv("XMODIFIERS") && (p = XSetLocaleModifiers("")) && *p) {
         xim_input_method = XOpenIM(Xdisplay, NULL, NULL, NULL);
     }
 
     /* try with no modifiers base */
-    if (xim_input_method == NULL && (p = XSetLocaleModifiers("@im=none")) != NULL && *p) {
+    if (!xim_input_method && (p = XSetLocaleModifiers("@im=none")) && *p) {
         xim_input_method = XOpenIM(Xdisplay, NULL, NULL, NULL);
     }
 
-    if (xim_input_method == NULL) {
+    if (!xim_input_method) {
         xim_input_method = XOpenIM(Xdisplay, NULL, NULL, NULL);
     }
 
-    if (xim_input_method == NULL) {
+    if (!xim_input_method) {
         return -1;
     }
 #ifdef USE_X11R6_XIM
@@ -2157,7 +2157,7 @@ xim_real_init(void)
     if (status_attr) {
         XFree(status_attr);
     }
-    if (xim_input_context == NULL) {
+    if (!xim_input_context) {
         libast_print_error("Failed to create input context\n");
         XCloseIM(xim_input_method);
         return -1;
@@ -2376,7 +2376,7 @@ run_command(char **argv)
         if (chdir(initial_dir)) {
             libast_print_warning("Unable to chdir to \"%s\" -- %s\n", initial_dir, strerror(errno));
         }
-        if (argv != NULL) {
+        if (argv) {
 #if DEBUG >= DEBUG_CMD
             if (DEBUG_LEVEL >= DEBUG_CMD) {
                 int i;
@@ -2393,7 +2393,7 @@ run_command(char **argv)
 
             const char *argv0, *shell;
 
-            if ((shell = getenv("SHELL")) == NULL || *shell == '\0')
+            if (!(shell = getenv("SHELL")) || *shell == '\0')
                 shell = "/bin/sh";
 
             argv0 = my_basename(shell);
@@ -3089,14 +3089,14 @@ escreen_init(char **argv)
     efuns = escreen_reg_funcs();
 
     /* Create buttonbar for Escreen's use. */
-    if ((bbar = bbar_create()) == NULL) {
-        if (buttonbar != NULL) {
+    if (!(bbar = bbar_create())) {
+        if (buttonbar) {
             bbar = buttonbar;
         } else {
             return -1;
         }
     } else {
-        if (buttonbar == NULL) {
+        if (!buttonbar) {
             buttonbar = bbar;
         }
         bbar_set_font(bbar, ((rs_es_font) ? (rs_es_font) : ("-*-helvetica-medium-r-normal--10-*-*-*-p-*-iso8859-1")));
@@ -3105,7 +3105,7 @@ escreen_init(char **argv)
     }
 
     BITFIELD_SET(eterm_options, ETERM_OPTIONS_PAUSE);
-    if ((TermWin.screen = ns_attach_by_URL(rs_url, rs_hop, &efuns, &ns_err, bbar)) == NULL) {
+    if (!(TermWin.screen = ns_attach_by_URL(rs_url, rs_hop, &efuns, &ns_err, bbar))) {
         D_CMD(("ns_attach_by_URL(%s,%s) failed\n", rs_url, rs_hop));
         return -1;
     }
@@ -3284,7 +3284,7 @@ check_pixmap_change(int sig)
         last_update = now;
         old_handler = signal(SIGALRM, check_pixmap_change);
         alarm(rs_anim_delay);
-        if (rs_anim_pixmaps[image_idx] == NULL) {
+        if (!rs_anim_pixmaps[image_idx]) {
             image_idx = 0;
         }
     }
@@ -3390,7 +3390,7 @@ cmd_getc(void)
             XNextEvent(Xdisplay, &ev);
 
 #ifdef USE_XIM
-            if (xim_input_context != NULL) {
+            if (xim_input_context) {
                 if (!XFilterEvent(&ev, ev.xkey.window)) {
                     event_dispatch(&ev);
                 }
@@ -3803,7 +3803,7 @@ v_writeBig(int f, char *d, int len)
     int written;
     int c = len;
 
-    if (v_bufstr == NULL && len > 0) {
+    if (!v_bufstr && len > 0) {
 
         v_buffer = MALLOC(len);
         v_bufstr = v_buffer;
diff --git a/src/defaultfont.c b/src/defaultfont.c
index 6200d89..2c45f19 100644
--- a/src/defaultfont.c
+++ b/src/defaultfont.c
@@ -178,10 +178,10 @@ eterm_default_font_locale(char ***fonts, char ***mfonts, char **mencoding, int *
     int j, k;
 
     locale = setlocale(LC_CTYPE, "");
-    if (locale == NULL)
-        if ((locale = getenv("LC_ALL")) == NULL)
-            if ((locale = getenv("LC_CTYPE")) == NULL)
-                if ((locale = getenv("LANG")) == NULL)
+    if (!locale)
+        if (!(locale = getenv("LC_ALL")))
+            if (!(locale = getenv("LC_CTYPE")))
+                if (!(locale = getenv("LANG")))
                     locale = "C";       /* failsafe */
 
     /* Obtain a "normalized" name of current encoding.
diff --git a/src/draw.c b/src/draw.c
index 355e246..85a22d0 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -168,7 +168,7 @@ bevel_pixmap(Pixmap p, int w, int h, Imlib_Border * bord, unsigned char up)
         real_depth = Xdepth;
     }
     ximg = XGetImage(Xdisplay, p, 0, 0, w, h, -1, ZPixmap);
-    if (ximg == NULL) {
+    if (!ximg) {
         return;
     }
     /* Determine bitshift and bitmask values */
diff --git a/src/e.c b/src/e.c
index e752fa4..6948e21 100644
--- a/src/e.c
+++ b/src/e.c
@@ -156,12 +156,12 @@ enl_ipc_send(char *str)
     unsigned short len;
     XEvent ev;
 
-    if (str == NULL) {
+    if (!str) {
         ASSERT(last_msg != NULL);
         str = last_msg;
         D_ENL(("Resending last message \"%s\" to Enlightenment.\n", str));
     } else {
-        if (last_msg != NULL) {
+        if (last_msg) {
             FREE(last_msg);
         }
         last_msg = STRDUP(str);
@@ -246,7 +246,7 @@ enl_ipc_get(const char *msg_data)
     }
     buff[12] = 0;
     blen = strlen(buff);
-    if (message != NULL) {
+    if (message) {
         len += blen;
         message = (char *) REALLOC(message, len + 1);
         strcat(message, buff);
diff --git a/src/events.c b/src/events.c
index aa10db5..43f255d 100644
--- a/src/events.c
+++ b/src/events.c
@@ -353,7 +353,7 @@ handle_client_message(event_t *ev)
 
         XGetWindowProperty(Xdisplay, Xroot, props[PROP_DND_SELECTION], 0L, 1000000L, False, AnyPropertyType, &ActualType,
                            &ActualFormat, &Size, &RemainingBytes, &data);
-        if (data != NULL) {
+        if (data) {
             XChangeProperty(Xdisplay, Xroot, XA_CUT_BUFFER0, XA_STRING, 8, PropModeReplace, data, strlen(data));
             selection_paste(XA_CUT_BUFFER0);
             XSetInputFocus(Xdisplay, Xroot, RevertToNone, CurrentTime);
@@ -493,7 +493,7 @@ handle_focus_in(event_t *ev)
         }
         bbar_draw_all(IMAGE_STATE_NORMAL, MODE_SOLID);
 #ifdef USE_XIM
-        if (xim_input_context != NULL)
+        if (xim_input_context)
             XSetICFocus(xim_input_context);
 #endif
         if (BITFIELD_IS_SET(vt_options, VT_OPTIONS_URG_ALERT)) {
@@ -527,7 +527,7 @@ handle_focus_out(event_t *ev)
         }
         bbar_draw_all(IMAGE_STATE_DISABLED, MODE_SOLID);
 #ifdef USE_XIM
-        if (xim_input_context != NULL)
+        if (xim_input_context)
             XUnsetICFocus(xim_input_context);
 #endif
     }
@@ -874,7 +874,7 @@ process_x_event(event_t *ev)
 #if 0
     D_EVENTS(("process_x_event(ev [%8p] %s on window 0x%08x)\n", ev, event_type_to_name(ev->xany.type), ev->xany.window));
 #endif
-    if (primary_data.handlers[ev->type] != NULL) {
+    if (primary_data.handlers[ev->type]) {
         return ((primary_data.handlers[ev->type]) (ev));
     }
     return (0);
diff --git a/src/font.c b/src/font.c
index 55efbce..4051f64 100644
--- a/src/font.c
+++ b/src/font.c
@@ -179,7 +179,7 @@ font_cache_add(const char *name, unsigned char type, void *info)
     D_FONT((" -> Created new cachefont_t struct at %p:  \"%s\", %d, %p\n", font, font->name, font->type, font->fontinfo.xfontinfo));
 
     /* Actually add the struct to the end of our cache linked list. */
-    if (font_cache == NULL) {
+    if (!font_cache) {
         font_cache = cur_font = font;
         font->next = NULL;
         D_FONT((" -> Stored as first font in cache.  font_cache == cur_font == font == %p\n", font_cache));
@@ -202,7 +202,7 @@ font_cache_del(const void *info)
 
     D_FONT(("font_cache_del(%8p) called.\n", info));
 
-    if (font_cache == NULL) {
+    if (!font_cache) {
         return;                 /* No fonts in the cache.  Theoretically this should never happen, but... */
     }
 
@@ -376,7 +376,7 @@ load_font(const char *name, const char *fallback, unsigned char type)
     }
 
     /* Specify some sane fallbacks */
-    if (name == NULL) {
+    if (!name) {
         if (fallback) {
             name = fallback;
             fallback = "fixed";
@@ -388,14 +388,14 @@ load_font(const char *name, const char *fallback, unsigned char type)
             fallback = "-misc-fixed-medium-r-normal--13-120-75-75-c-60-iso8859-1";
 #endif
         }
-    } else if (fallback == NULL) {
+    } else if (!fallback) {
         fallback = "fixed";
     }
     D_FONT((" -> Using name == \"%s\" and fallback == \"%s\"\n", name, fallback));
 
     /* Look for the font name in the cache.  If it's there, add one to the
        reference count and return the existing fontinfo pointer to the caller. */
-    if ((font = font_cache_find(name, type)) != NULL) {
+    if ((font = font_cache_find(name, type))) {
         font_cache_add_ref(font);
         D_FONT((" -> Font found in cache.  Incrementing reference count to %d and returning existing data.\n", font->ref_cnt));
         switch (type) {
@@ -416,9 +416,9 @@ load_font(const char *name, const char *fallback, unsigned char type)
 
     /* No match in the cache, so we'll have to add it. */
     if (type == FONT_TYPE_X) {
-        if ((xfont = XLoadQueryFont(Xdisplay, name)) == NULL) {
+        if (!(xfont = XLoadQueryFont(Xdisplay, name))) {
             libast_print_error("Unable to load font \"%s\".  Falling back on \"%s\"\n", name, fallback);
-            if ((xfont = XLoadQueryFont(Xdisplay, fallback)) == NULL) {
+            if (!(xfont = XLoadQueryFont(Xdisplay, fallback))) {
                 libast_fatal_error("Couldn't load the fallback font either.  Giving up.\n");
             } else {
                 font_cache_add(fallback, type, (void *) xfont);
@@ -461,7 +461,7 @@ change_font(int init, const char *fontname)
 
     if (init) {
         ASSERT(etfonts != NULL);
-        if ((def_font_idx >= font_cnt) || (etfonts[def_font_idx] == NULL)) {
+        if ((def_font_idx >= font_cnt) || (!etfonts[def_font_idx])) {
             def_font_idx = font_idx;
         } else {
             font_idx = def_font_idx;
@@ -518,7 +518,7 @@ change_font(int init, const char *fontname)
         }
 
         /* If we get here with a non-NULL fontname, we have to load a new font.  Rats. */
-        if (fontname != NULL) {
+        if (fontname) {
             eterm_font_add(&etfonts, fontname, font_idx);
         } else if (font_idx == old_idx) {
             /* Sigh.  What a waste of time, changing to the same font. */
@@ -539,7 +539,7 @@ change_font(int init, const char *fontname)
     }
 
 #ifndef NO_BOLDFONT
-    if (init && rs_boldFont != NULL) {
+    if (init && rs_boldFont) {
         /* If we're initializing, load the bold font too. */
         boldFont = load_font(rs_boldFont, "-misc-fixed-bold-r-semicondensed--13-120-75-75-c-60-iso8859-1", FONT_TYPE_X);
     }
@@ -636,7 +636,7 @@ change_font(int init, const char *fontname)
     /* Check the bold font size and make sure it matches the normal font */
 #ifndef NO_BOLDFONT
     TermWin.boldFont = NULL;    /* FIXME:  Memory leak?  Not that anyone uses bold fonts.... */
-    if (boldFont != NULL) {
+    if (boldFont) {
 
         fw = boldFont->min_bounds.width;
         fh = boldFont->ascent + boldFont->descent + rs_line_space;
@@ -825,7 +825,7 @@ parse_font_fx(char *line)
             }
             set_shadow_color_by_name(which, color);
             FREE(color);
-            if (line == NULL) {
+            if (!line) {
                 break;
             }
         }
diff --git a/src/grkelot.c b/src/grkelot.c
index d8fed71..285dbfb 100644
--- a/src/grkelot.c
+++ b/src/grkelot.c
@@ -250,7 +250,7 @@ kstate_add_xlat(char *str)
     char *sval;
     int i;
 
-    if (str == NULL)
+    if (!str)
         return;
     /* add a new xlat table in state */
     if (pStateNow->num_xlat == 0) {
@@ -263,11 +263,11 @@ kstate_add_xlat(char *str)
     xlat->last = (u_int) atoi(strtok(NULL, ":"));
     i = 0;
     pval_tmp = CALLOC(MAX_VAL, sizeof(K_XLAT));
-    while ((sval = strtok(NULL, ",")) != NULL) {
+    while ((sval = strtok(NULL, ","))) {
         pval_tmp[i++] = (u_int) (atoi(sval));
     }
     xlat->pval = CALLOC(i, sizeof(K_XLAT));
-    if (xlat->pval != NULL)
+    if (xlat->pval)
         memcpy(xlat->pval, pval_tmp, i * sizeof(u_int));
     FREE(pval_tmp);
     pStateNow->num_xlat++;
@@ -281,7 +281,7 @@ kstate_add_switcher(char *str)
 {
     K_SWITCH *switcher;
 
-    if (str == NULL)
+    if (!str)
         return;
     if (pStateNow->num_switcher >= MAX_SWITCHER)
         return;
diff --git a/src/menus.c b/src/menus.c
index 99143e0..f53c9ea 100644
--- a/src/menus.c
+++ b/src/menus.c
@@ -301,7 +301,7 @@ menu_handle_button_release(event_t *ev)
 
         if (button_press_time && (ev->xbutton.time - button_press_time > MENU_CLICK_TIME)) {
             /* Take action here based on the current menu item */
-            if ((item = menuitem_get_current(current_menu)) != NULL) {
+            if ((item = menuitem_get_current(current_menu))) {
                 if (item->type == MENUITEM_SUBMENU) {
                     menu_display_submenu(current_menu, item);
                 } else {
@@ -326,7 +326,7 @@ menu_handle_button_release(event_t *ev)
         if (current_menu && (ev->xbutton.x >= 0) && (ev->xbutton.y >= 0) && (ev->xbutton.x < current_menu->w)
             && (ev->xbutton.y < current_menu->h)) {
             /* Click inside the menu window.  Activate the current item. */
-            if ((item = menuitem_get_current(current_menu)) != NULL) {
+            if ((item = menuitem_get_current(current_menu))) {
                 if (item->type == MENUITEM_SUBMENU) {
                     menu_display_submenu(current_menu, item);
                 } else {
@@ -415,7 +415,7 @@ menu_handle_motion_notify(event_t *ev)
 unsigned char
 menu_dispatch_event(event_t *ev)
 {
-    if (menu_event_data.handlers[ev->type] != NULL) {
+    if (menu_event_data.handlers[ev->type]) {
         return ((menu_event_data.handlers[ev->type]) (ev));
     }
     return (0);
@@ -599,7 +599,7 @@ menu_is_child(menu_t *menu, menu_t *submenu)
 
     for (i = 0; i < menu->numitems; i++) {
         item = menu->items[i];
-        if (item->type == MENUITEM_SUBMENU && item->action.submenu != NULL) {
+        if (item->type == MENUITEM_SUBMENU && item->action.submenu) {
             if (item->action.submenu == submenu) {
                 return 1;
             } else if (menu_is_child(item->action.submenu, submenu)) {
@@ -686,8 +686,8 @@ menuitem_change_current(menuitem_t *item)
             menuitem_deselect(current_menu);
             /* If we're changing from one submenu to another and neither is a child of the other, or if we're changing from a submenu to
                no current item at all, reset the tree for the current submenu */
-            if (current->type == MENUITEM_SUBMENU && current->action.submenu != NULL) {
-                if ((item && item->type == MENUITEM_SUBMENU && item->action.submenu != NULL
+            if (current->type == MENUITEM_SUBMENU && current->action.submenu) {
+                if ((item && item->type == MENUITEM_SUBMENU && item->action.submenu
                      && !menu_is_child(current->action.submenu, item->action.submenu)
                      && !menu_is_child(item->action.submenu, current->action.submenu))
                     || (!item)) {
@@ -839,7 +839,7 @@ menu_reset_all(menulist_t *list)
         return;
 
     D_MENU(("menu_reset_all(%8p) called\n", list));
-    if (current_menu && menuitem_get_current(current_menu) != NULL) {
+    if (current_menu && menuitem_get_current(current_menu)) {
         menuitem_deselect(current_menu);
     }
     for (i = 0; i < list->nummenus; i++) {
@@ -862,7 +862,7 @@ menu_reset_tree(menu_t *menu)
     }
     for (i = 0; i < menu->numitems; i++) {
         item = menu->items[i];
-        if (item->type == MENUITEM_SUBMENU && item->action.submenu != NULL) {
+        if (item->type == MENUITEM_SUBMENU && item->action.submenu) {
             menu_reset_tree(item->action.submenu);
         }
     }
@@ -880,7 +880,7 @@ menu_reset_submenus(menu_t *menu)
     D_MENU(("menu_reset_submenus(menu %8p \"%s\"), window 0x%08x\n", menu, menu->title, menu->win));
     for (i = 0; i < menu->numitems; i++) {
         item = menu->items[i];
-        if (item->type == MENUITEM_SUBMENU && item->action.submenu != NULL) {
+        if (item->type == MENUITEM_SUBMENU && item->action.submenu) {
             menu_reset_tree(item->action.submenu);
         }
     }
@@ -1344,11 +1344,11 @@ menu_dialog(void *xd, char *prompt, int maxlen, char **retstr, int (*inp_tab) (v
         inp_tab = NULL;
         maxlen = 0;
         retstr = NULL;
-        if ((b = STRDUP("Press \"Return\" to continue...")) == NULL) {
+        if (!(b = STRDUP("Press \"Return\" to continue..."))) {
             return ret;
         }
     } else {
-        if (((b = MALLOC(maxlen + 1)) == NULL)) {
+        if ((!(b = MALLOC(maxlen + 1)))) {
             return ret;
         } else if (*retstr) {
             strncpy(b, *retstr, maxlen);
diff --git a/src/misc.c b/src/misc.c
index f793344..6a94aa1 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -285,7 +285,7 @@ safe_print_string(const char *str, unsigned long len)
         rb_size = 0;
         return ((char *) NULL);
     }
-    if (ret_buff == NULL) {
+    if (!ret_buff) {
         rb_size = len;
         ret_buff = (char *) MALLOC(rb_size + 1);
     } else if (len > rb_size) {
diff --git a/src/options.c b/src/options.c
index 2b305a3..aa19b9a 100644
--- a/src/options.c
+++ b/src/options.c
@@ -1345,7 +1345,7 @@ parse_keyboard(char *buff, void *state)
             len = parse_escaped_string(str);
             if (len > 255)
                 len = 255;      /* We can only handle lengths that will fit in a char */
-            if (len && KeySym_map[sym] == NULL) {
+            if (len && !KeySym_map[sym]) {
 
                 char *p = MALLOC(len + 1);
 
@@ -1674,7 +1674,7 @@ parse_image(char *buff, void *state)
         if (allow_list) {
             char *allow;
 
-            for (; (allow = (char *) strsep(&allow_list, " ")) != NULL;) {
+            for (; (allow = (char *)strsep(&allow_list, " "));) {
                 if (!BEG_STRCASECMP(allow, "image")) {
                     images[idx].mode |= ALLOW_IMAGE;
                 } else if (!BEG_STRCASECMP(allow, "trans")) {
@@ -1703,25 +1703,25 @@ parse_image(char *buff, void *state)
             return NULL;
         }
         if (!strcasecmp(state, "normal")) {
-            if (images[idx].norm == NULL) {
+            if (!images[idx].norm) {
                 images[idx].norm = (simage_t *) MALLOC(sizeof(simage_t));
                 new = 1;
             }
             images[idx].current = images[idx].norm;
         } else if (!strcasecmp(state, "selected")) {
-            if (images[idx].selected == NULL) {
+            if (!images[idx].selected) {
                 images[idx].selected = (simage_t *) MALLOC(sizeof(simage_t));
                 new = 1;
             }
             images[idx].current = images[idx].selected;
         } else if (!strcasecmp(state, "clicked")) {
-            if (images[idx].clicked == NULL) {
+            if (!images[idx].clicked) {
                 images[idx].clicked = (simage_t *) MALLOC(sizeof(simage_t));
                 new = 1;
             }
             images[idx].current = images[idx].clicked;
         } else if (!strcasecmp(state, "disabled")) {
-            if (images[idx].disabled == NULL) {
+            if (!images[idx].disabled) {
                 images[idx].disabled = (simage_t *) MALLOC(sizeof(simage_t));
                 new = 1;
             }
@@ -1745,7 +1745,7 @@ parse_image(char *buff, void *state)
                         file_peek_line());
             return NULL;
         }
-        if (images[idx].current == NULL) {
+        if (!images[idx].current) {
             libast_print_error("Parse error in file %s, line %lu:  Encountered \"color\" with no image state defined\n", file_peek_path(),
                         file_peek_line());
             return NULL;
@@ -1777,7 +1777,7 @@ parse_image(char *buff, void *state)
                         file_peek_line());
             return NULL;
         }
-        if (images[idx].current == NULL) {
+        if (!images[idx].current) {
             libast_print_error("Parse error in file %s, line %lu:  Encountered \"file\" with no image state defined\n", file_peek_path(),
                         file_peek_line());
             return NULL;
@@ -1801,7 +1801,7 @@ parse_image(char *buff, void *state)
                         file_peek_line());
             return NULL;
         }
-        if (images[idx].current == NULL) {
+        if (!images[idx].current) {
             libast_print_error("Parse error in file %s, line %lu:  Encountered \"geom\" with no image state defined\n", file_peek_path(),
                         file_peek_line());
             return NULL;
@@ -1825,7 +1825,7 @@ parse_image(char *buff, void *state)
                         file_peek_path(), file_peek_line());
             return NULL;
         }
-        if (images[idx].current == NULL) {
+        if (!images[idx].current) {
             libast_print_error("Parse error in file %s, line %lu:  Encountered color modifier with no image state defined\n",
                         file_peek_path(), file_peek_line());
             return NULL;
@@ -1928,7 +1928,7 @@ parse_image(char *buff, void *state)
                         file_peek_line());
             return NULL;
         }
-        if (images[idx].current == NULL) {
+        if (!images[idx].current) {
             libast_print_error("Parse error in file %s, line %lu:  Encountered \"bevel\" with no image state defined\n", file_peek_path(),
                         file_peek_line());
             return NULL;
@@ -1938,7 +1938,7 @@ parse_image(char *buff, void *state)
                         file_peek_line());
             return NULL;
         }
-        if (images[idx].current->iml->bevel != NULL) {
+        if (images[idx].current->iml->bevel) {
             FREE(images[idx].current->iml->bevel->edges);
             FREE(images[idx].current->iml->bevel);
         }
@@ -1968,7 +1968,7 @@ parse_image(char *buff, void *state)
                         file_peek_line());
             return NULL;
         }
-        if (images[idx].current == NULL) {
+        if (!images[idx].current) {
             libast_print_error("Parse error in file %s, line %lu:  Encountered \"padding\" with no image state defined\n",
                         file_peek_path(), file_peek_line());
             return NULL;
@@ -2370,7 +2370,7 @@ parse_multichar(char *buff, void *state)
     }
     if (!BEG_STRCASECMP(buff, "encoding ")) {
         RESET_AND_ASSIGN(rs_multichar_encoding, spiftool_get_word(2, buff));
-        if (rs_multichar_encoding != NULL) {
+        if (rs_multichar_encoding) {
             if (BEG_STRCASECMP(rs_multichar_encoding, "eucj")
                 && BEG_STRCASECMP(rs_multichar_encoding, "sjis")
                 && BEG_STRCASECMP(rs_multichar_encoding, "euckr")
@@ -2486,13 +2486,13 @@ spifconf_parse_theme(char **theme, char *spifconf_name, unsigned char fallback)
         spifconf_shell_expand(path);
     }
     if (fallback & PARSE_TRY_USER_THEME) {
-        if (theme && *theme && (ret = spifconf_parse(spifconf_name, *theme, path)) != NULL) {
+        if (theme && *theme && (ret = spifconf_parse(spifconf_name, *theme, path))) {
             return ret;
         }
     }
     if (fallback & PARSE_TRY_DEFAULT_THEME) {
         RESET_AND_ASSIGN(*theme, STRDUP(PACKAGE));
-        if ((ret = spifconf_parse(spifconf_name, *theme, path)) != NULL) {
+        if ((ret = spifconf_parse(spifconf_name, *theme, path))) {
             return ret;
         }
     }
@@ -2634,8 +2634,8 @@ post_parse(void)
     }
 
     /* set any defaults not already set */
-    if (rs_name == NULL) {
-        if (rs_exec_args != NULL) {
+    if (!rs_name) {
+        if (rs_exec_args) {
             rs_name = STRDUP(rs_exec_args[0]);
         } else {
             rs_name = STRDUP(APL_NAME " " VERSION);
@@ -2666,7 +2666,7 @@ post_parse(void)
 #endif
 
 #ifndef NO_BOLDFONT
-    if (rs_font[0] == NULL && rs_boldFont != NULL) {
+    if (!rs_font[0] && rs_boldFont) {
         rs_font[0] = rs_boldFont;
         rs_boldFont = NULL;
     }
@@ -2697,7 +2697,7 @@ post_parse(void)
                 eterm_font_add(&etmfonts, rs_mfont[i], ((i == 0) ? def_font_idx : ((i <= def_font_idx) ? (i - 1) : i)));
                 RESET_AND_ASSIGN(rs_mfont[i], NULL);
             }
-        } else if (etmfonts[i] == NULL) {
+        } else if (!etmfonts[i]) {
             eterm_font_add(&etmfonts, etfonts[i], i);
         }
 #endif
@@ -2719,7 +2719,7 @@ post_parse(void)
 #endif
     }
 #ifdef MULTI_CHARSET
-    if (rs_multichar_encoding != NULL) {
+    if (rs_multichar_encoding) {
         set_multichar_encoding(rs_multichar_encoding);
     }
 #endif
@@ -3042,7 +3042,7 @@ post_parse(void)
         NumLockMask = modmasks[rs_numlock_mod - 1];
     }
 #ifdef BACKGROUND_CYCLING_SUPPORT
-    if (rs_anim_pixmap_list != NULL) {
+    if (rs_anim_pixmap_list) {
         rs_anim_delay = strtoul(rs_anim_pixmap_list, (char **) NULL, 0);
         fflush(stdout);
         if (rs_anim_delay == 0) {
@@ -3058,7 +3058,7 @@ post_parse(void)
 
             for (i = 0; i < count; i++) {
                 temp = spiftool_get_word(i + 2, rs_anim_pixmap_list);    /* +2 rather than +1 to account for the delay */
-                if (temp == NULL)
+                if (!temp)
                     break;
                 if (spiftool_num_words(temp) != 3) {
                     if (spiftool_num_words(temp) == 1) {
@@ -3194,7 +3194,7 @@ save_config(char *path, unsigned char save_theme)
         link(path, bak_path);
         unlink(path);
     }
-    if ((fp = fopen(path, "w")) == NULL) {
+    if (!(fp = fopen(path, "w"))) {
         libast_print_error("Unable to save configuration to file \"%s\" -- %s\n", path, strerror(errno));
         return errno;
     }
@@ -3286,7 +3286,7 @@ save_config(char *path, unsigned char save_theme)
         fprintf(fp, "begin imageclasses\n");
         fprintf(fp, "    path \"%s\"\n", rs_path);
 #ifdef PIXMAP_SUPPORT
-        if (rs_icon != NULL) {
+        if (rs_icon) {
             fprintf(fp, "    icon %s\n", rs_icon);
         }
         if (rs_anim_delay) {
diff --git a/src/options.h b/src/options.h
index 00c3fdf..2acb680 100644
--- a/src/options.h
+++ b/src/options.h
@@ -83,7 +83,7 @@
                                    } while (0)
 #define CHECK_VALID_INDEX(i)       (((i) >= image_bg) && ((i) < image_max))
 
-#define RESET_AND_ASSIGN(var, val)  do {if ((var) != NULL) FREE(var);  (var) = (val);} while (0)
+#define RESET_AND_ASSIGN(var, val)  do {if ((var)) FREE(var);  (var) = (val);} while (0)
 
 #define BITFIELD_SET(var, field)       ((var) |= (field))
 #define BITFIELD_CLEAR(var, field)     ((var) &= ~(field))
diff --git a/src/pixmap.c b/src/pixmap.c
index 0330ac9..a9e45ad 100644
--- a/src/pixmap.c
+++ b/src/pixmap.c
@@ -263,7 +263,7 @@ set_pixmap_scale(const char *geom, pixmap_t *pmap)
     char *p, *opstr;
     int n;
 
-    if (geom == NULL)
+    if (!geom)
         return 0;
 
     D_PIXMAP(("scale_pixmap(\"%s\")\n", geom));
@@ -272,13 +272,13 @@ set_pixmap_scale(const char *geom, pixmap_t *pmap)
         xterm_seq(ESCSEQ_XTERM_TITLE, str);
         return 0;
     }
-    if ((opstr = strchr(geom, ':')) != NULL) {
+    if ((opstr = strchr(geom, ':'))) {
         *opstr++ = '\0';
         op = parse_pixmap_ops(opstr);
     } else {
         op = pmap->op;
     }
-    if ((p = strchr(geom, ';')) == NULL)
+    if (!(p = strchr(geom, ';')))
         p = strchr(geom, '\0');
     n = (p - geom);
     if (n > GEOM_LEN - 1)
@@ -696,7 +696,7 @@ create_trans_pixmap(simage_t *simg, unsigned char which, Drawable d, int x, int
             && need_colormod(simg->iml)) {
             colormod_trans(p, simg->iml, gc, width, height);
         }
-        if (simg->iml->bevel != NULL) {
+        if (simg->iml->bevel) {
             D_PIXMAP(("Beveling pixmap 0x%08x with edges %d, %d, %d, %d\n", p, simg->iml->bevel->edges->left,
                       simg->iml->bevel->edges->top, simg->iml->bevel->edges->right, simg->iml->bevel->edges->bottom));
             bevel_pixmap(p, width, height, simg->iml->bevel->edges, simg->iml->bevel->up);
@@ -872,7 +872,7 @@ paste_simage(simage_t *simg, unsigned char which, Window win, Drawable d, unsign
 
             gc = LIBAST_X_CREATE_GC(0, NULL);
             p = create_viewport_pixmap(simg, win, x, y, w, h);
-            if (simg->iml->bevel != NULL) {
+            if (simg->iml->bevel) {
                 bevel_pixmap(p, w, h, simg->iml->bevel->edges, simg->iml->bevel->up);
             }
             XCopyArea(Xdisplay, p, d, gc, 0, 0, w, h, x, y);
@@ -882,7 +882,7 @@ paste_simage(simage_t *simg, unsigned char which, Window win, Drawable d, unsign
     }
 
     if (((which == image_max) || (image_mode_is(which, MODE_IMAGE) && image_mode_is(which, ALLOW_IMAGE)))
-        && (simg->iml != NULL)) {
+        && (simg->iml)) {
         imlib_context_set_image(simg->iml->im);
         imlib_context_set_drawable(d);
         imlib_context_set_anti_alias(1);
@@ -1251,7 +1251,7 @@ render_simage(simage_t *simg, Window win, unsigned short width, unsigned short h
                 } else {
                     shaped_window_apply_mask(win, simg->pmap->mask);
                 }
-                if (simg->iml->bevel != NULL) {
+                if (simg->iml->bevel) {
                     bevel_pixmap(simg->pmap->pixmap, width, height, simg->iml->bevel->edges, simg->iml->bevel->up);
                 }
                 D_PIXMAP(("Setting background of window 0x%08x to 0x%08x\n", win, simg->pmap->pixmap));
@@ -1285,14 +1285,14 @@ render_simage(simage_t *simg, Window win, unsigned short width, unsigned short h
             copy_buffer_pixmap(MODE_SOLID, (unsigned long) PixColors[bgColor], width, height);
             XSetWindowBackgroundPixmap(Xdisplay, win, buffer_pixmap);
         } else {
-            if ((renderop & RENDER_FORCE_PIXMAP) || (simg->iml->bevel != NULL)) {
+            if ((renderop & RENDER_FORCE_PIXMAP) || (simg->iml->bevel)) {
                 if (simg->pmap->pixmap != None) {
                     LIBAST_X_FREE_PIXMAP(simg->pmap->pixmap);
                 }
                 simg->pmap->pixmap = LIBAST_X_CREATE_PIXMAP(width, height);
                 XSetForeground(Xdisplay, gc, ((which == image_bg) ? (PixColors[bgColor]) : (simg->bg)));
                 XFillRectangle(Xdisplay, simg->pmap->pixmap, gc, 0, 0, width, height);
-                if (simg->iml->bevel != NULL && simg->iml->bevel->edges != NULL) {
+                if (simg->iml->bevel && simg->iml->bevel->edges) {
                     DRAW_SOLID_BEVEL(simg->pmap->pixmap, width, height, simg->bg, simg->iml->bevel->up,
                                      simg->iml->bevel->edges->left);
                 }
@@ -1345,7 +1345,7 @@ search_path(const char *pathlist, const char *file)
         D_OPTIONS(("Unable to access %s -- %s\n", name, strerror(errno)));
     }
 
-    if ((p = strchr(file, '@')) == NULL)
+    if (!(p = strchr(file, '@')))
         p = strchr(file, '\0');
     len = (p - file);
     /* leave room for an extra '/' and trailing '\0' */
@@ -1370,11 +1370,11 @@ search_path(const char *pathlist, const char *file)
     } else {
         D_OPTIONS(("Unable to access %s -- %s\n", name, strerror(errno)));
     }
-    for (path = pathlist; path != NULL && *path != '\0'; path = p) {
+    for (path = pathlist; path && *path != '\0'; path = p) {
         int n;
 
         /* colon delimited */
-        if ((p = strchr(path, ':')) == NULL)
+        if (!(p = strchr(path, ':')))
             p = strchr(path, '\0');
         n = (p - path);
         if (*p != '\0')
@@ -1433,20 +1433,20 @@ load_image(const char *file, simage_t *simg)
     ASSERT_RVAL(simg != NULL, 0);
     D_PIXMAP(("load_image(%s, %8p)\n", file, simg));
     if (*file != '\0') {
-        if ((geom = strchr(file, '@')) != NULL) {
+        if ((geom = strchr(file, '@'))) {
             *geom++ = 0;
-        } else if ((geom = strchr(file, ';')) != NULL) {
+        } else if ((geom = strchr(file, ';'))) {
             *geom++ = 0;
         }
-        if (geom != NULL) {
+        if (geom) {
             set_pixmap_scale(geom, simg->pmap);
         }
-        if ((f = search_path(rs_path, file)) == NULL) {
+        if (!(f = search_path(rs_path, file))) {
             f = search_path(getenv(PATH_ENV), file);
         }
-        if (f != NULL) {
+        if (f) {
             im = imlib_load_image_with_error_return(f, &im_err);
-            if (im == NULL) {
+            if (!im) {
                 libast_print_error("Unable to load image file \"%s\" -- %s\n", file, imlib_strerror(im_err));
                 return 0;
             } else {
@@ -1810,7 +1810,7 @@ colormod_trans(Pixmap p, imlib_t *iml, GC gc, unsigned short w, unsigned short h
         real_depth = Xdepth;
     }
     ximg = XGetImage(Xdisplay, p, 0, 0, w, h, -1, ZPixmap);
-    if (ximg == NULL) {
+    if (!ximg) {
         libast_print_warning("XGetImage(Xdisplay, 0x%08x, 0, 0, %d, %d, -1, ZPixmap) returned NULL.\n", p, w, h);
         return;
     }
@@ -2170,14 +2170,14 @@ set_icon_pixmap(char *filename, XWMHints * pwm_hints)
     imlib_context_set_color_modifier(tmp_cmod);
     imlib_reset_color_modifier();
     if (filename && *filename) {
-        if ((icon_path = search_path(rs_path, filename)) == NULL)
+        if (!(icon_path = search_path(rs_path, filename)))
             icon_path = search_path(getenv(PATH_ENV), filename);
-        if (icon_path != NULL) {
+        if (icon_path) {
             XIconSize *icon_sizes;
             int count, i;
 
             temp_im = imlib_load_image_with_error_return(icon_path, &im_err);
-            if (temp_im == NULL) {
+            if (!temp_im) {
                 libast_print_error("Unable to load icon file \"%s\" -- %s\n", icon_path, imlib_strerror(im_err));
             } else {
                 /* If we're going to render the image anyway, might as well be nice and give it to the WM in a size it likes. */
@@ -2205,7 +2205,7 @@ set_icon_pixmap(char *filename, XWMHints * pwm_hints)
         }
     }
 
-    if (temp_im == NULL) {
+    if (!temp_im) {
         w = h = 48;
         temp_im = imlib_create_image_using_data(48, 48, (DATA32 *) (icon_data + 2));
         imlib_context_set_image(temp_im);
diff --git a/src/screen.c b/src/screen.c
index 006856b..1005fac 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -122,7 +122,7 @@ blank_screen_mem(text_t **tp, rend_t **rp, int row, rend_t efs)
     register unsigned int i = TERM_WINDOW_GET_REPORTED_COLS();
     rend_t *r, fs = efs;
 
-    if (tp[row] == NULL) {
+    if (!tp[row]) {
         tp[row] = MALLOC(sizeof(text_t) * (TERM_WINDOW_GET_REPORTED_COLS() + 1));
         rp[row] = MALLOC(sizeof(rend_t) * TERM_WINDOW_GET_REPORTED_COLS());
     }
@@ -264,7 +264,7 @@ scr_reset(void)
                 screen.row += k;
                 TermWin.nscrolled -= k;
                 for (i = TermWin.saveLines - TermWin.nscrolled; k--; i--) {
-                    if (screen.text[i] == NULL) {
+                    if (!screen.text[i]) {
                         blank_screen_mem(screen.text, screen.rend, i, DEFAULT_RSTYLE);
                     }
                 }
@@ -455,7 +455,7 @@ scr_change_screen(int scrn)
     if (current_screen == PRIMARY) {
         scroll_text(0, (TERM_WINDOW_GET_REPORTED_ROWS() - 1), TERM_WINDOW_GET_REPORTED_ROWS(), 0);
         for (i = TermWin.saveLines; i < TERM_WINDOW_GET_REPORTED_ROWS() + TermWin.saveLines; i++)
-            if (screen.text[i] == NULL) {
+            if (!screen.text[i]) {
                 blank_screen_mem(screen.text, screen.rend, i, DEFAULT_RSTYLE);
             }
     }
@@ -634,7 +634,7 @@ scroll_text(int row1, int row2, int count, int spec)
         for (i = 0, j = row1; i < count; i++, j++) {
             buf_text[i] = screen.text[j];
             buf_rend[i] = screen.rend[j];
-            if (buf_text[i] == NULL) {
+            if (!buf_text[i]) {
                 /* A new ALLOC is done with size ncol and
                    blankline with size prev_ncol -- Sebastien van K */
                 buf_text[i] = MALLOC(sizeof(text_t) * (prev_ncol + 1));
@@ -661,7 +661,7 @@ scroll_text(int row1, int row2, int count, int spec)
         for (i = 0, j = row2; i < count; i++, j--) {
             buf_text[i] = screen.text[j];
             buf_rend[i] = screen.rend[j];
-            if (buf_text[i] == NULL) {
+            if (!buf_text[i]) {
                 /* A new ALLOC is done with size ncol and
                    blankline with size prev_ncol -- Sebastien van K */
                 buf_text[i] = MALLOC(sizeof(text_t) * (prev_ncol + 1));
@@ -728,7 +728,7 @@ scr_add_lines(const unsigned char *str, int nlines, int len)
     BOUND(screen.row, -TermWin.nscrolled, TERM_WINDOW_GET_REPORTED_ROWS() - 1);
 
     row = screen.row + TermWin.saveLines;
-    if (screen.text[row] == NULL) {
+    if (!screen.text[row]) {
         blank_screen_mem(screen.text, screen.rend, row, DEFAULT_RSTYLE);
     }                           /* avoid segfault -- added by Sebastien van K */
     beg.row = screen.row;
@@ -1581,7 +1581,7 @@ scr_printscreen(int fullhist)
     text_t *t;
     FILE *fd;
 
-    if ((fd = popen_printer()) == NULL)
+    if (!(fd = popen_printer()))
         return;
     nrows = TERM_WINDOW_GET_REPORTED_ROWS();
     if (fullhist) {
@@ -1945,7 +1945,7 @@ scr_refresh(int type)
                 XChangeGC(Xdisplay, TermWin.gc, gcmask, &gcvalue);
             }
 #ifndef NO_BOLDFONT
-            if (!wbyte && MONO_BOLD(rend) && TermWin.boldFont != NULL) {
+            if (!wbyte && MONO_BOLD(rend) && TermWin.boldFont) {
                 XSetFont(Xdisplay, TermWin.gc, TermWin.boldFont->fid);
                 bfont = 1;
             } else if (bfont) {
@@ -2256,8 +2256,8 @@ scr_search_scrollback(char *str)
     unsigned int *i;
     unsigned long row, lrow, col, rows, cols, len, k;
 
-    if (str == NULL) {
-        if ((str = last_str) == NULL) {
+    if (!str) {
+        if (!(str = last_str)) {
             return;
         }
     } else {
@@ -2498,9 +2498,9 @@ selection_fetch(Window win, unsigned prop, int delete)
         if ((XGetWindowProperty
              (Xdisplay, win, prop, (nread / 4), PROP_SIZE, delete, AnyPropertyType, &actual_type, &actual_fmt, &nitems,
               &bytes_after, &data) != Success)
-            || (actual_type == None) || (data == NULL)) {
+            || (actual_type == None) || (!data)) {
             D_SELECT(("Unable to fetch the value of property %d from window 0x%08x\n", (int) prop, (int) win));
-            if (data != NULL) {
+            if (data) {
                 XFree(data);
             }
             return;
@@ -2557,7 +2557,7 @@ void
 selection_copy_string(Atom sel, char *str, size_t len)
 {
     D_SELECT(("Copying %ul bytes from 0x%08x to selection %d\n", len, str, (int) sel));
-    if (str == NULL || len == 0) {
+    if (!str || len == 0) {
         return;
     }
     if (IS_SELECTION(sel)) {
@@ -2584,7 +2584,7 @@ void
 selection_paste(Atom sel)
 {
     D_SELECT(("Attempting to paste selection %d.\n", (int) sel));
-    if (selection.text != NULL) {
+    if (selection.text) {
         /* If we have a selection of our own, paste it. */
         D_SELECT(("Pasting my current selection of length %lu\n", selection.len));
         selection_write(selection.text, selection.len);
@@ -2857,9 +2857,9 @@ selection_click(int clicks, int x, int y)
 
 /* what do we want: spaces/tabs are delimiters or cutchars or non-cutchars */
 #ifdef CUTCHAR_OPTION
-#  define DELIMIT_TEXT(x) (strchr((rs_cutchars?rs_cutchars:CUTCHARS), (x)) != NULL)
+#  define DELIMIT_TEXT(x) (strchr((rs_cutchars ? rs_cutchars : CUTCHARS), (x)))
 #else
-#  define DELIMIT_TEXT(x) (strchr(CUTCHARS, (x)) != NULL)
+#  define DELIMIT_TEXT(x) (strchr(CUTCHARS, (x)))
 #endif
 #ifdef MULTI_CHARSET
 #define DELIMIT_REND(x)	(((x) & RS_multiMask) ? 1 : 0)
@@ -3351,7 +3351,7 @@ selection_send(XSelectionRequestEvent * rq)
         xtextp.value = NULL;
         xtextp.nitems = 0;
         if (XmbTextListToTextProperty(Xdisplay, l, 1, XUTF8StringStyle, &xtextp) == Success) {
-            if (xtextp.nitems > 0 && xtextp.value != NULL) {
+            if (xtextp.nitems > 0 && xtextp.value) {
                 XChangeProperty(Xdisplay, rq->requestor, rq->property,
                                 rq->target, 8, PropModeReplace, xtextp.value, xtextp.nitems);
                 ev.xselection.property = rq->property;
@@ -3367,7 +3367,7 @@ selection_send(XSelectionRequestEvent * rq)
         xtextp.value = NULL;
         xtextp.nitems = 0;
         if (XmbTextListToTextProperty(Xdisplay, l, 1, XCompoundTextStyle, &xtextp) == Success) {
-            if (xtextp.nitems > 0 && xtextp.value != NULL) {
+            if (xtextp.nitems > 0 && xtextp.value) {
                 XChangeProperty(Xdisplay, rq->requestor, rq->property, props[PROP_COMPOUND_TEXT],
                                 8, PropModeReplace, xtextp.value, xtextp.nitems);
                 ev.xselection.property = rq->property;
diff --git a/src/script.c b/src/script.c
index 2424904..336f20a 100644
--- a/src/script.c
+++ b/src/script.c
@@ -160,7 +160,7 @@ script_handler_copy(spif_charptr_t *params)
     Atom sel = XA_PRIMARY;
 
     if (params) {
-        for (i = 0; (buffer_id = params[i]) != NULL; i++) {
+        for (i = 0; (buffer_id = params[i]); i++) {
             if (*buffer_id) {
                 if (*buffer_id >= '0' && *buffer_id <= '7') {
                     sel = (Atom) ((int) XA_CUT_BUFFER0 + (int) (*buffer_id - '0'));
@@ -261,7 +261,7 @@ script_handler_paste(spif_charptr_t *params)
     Atom sel = XA_PRIMARY;
 
     if (params) {
-        for (i = 0; (buffer_id = params[i]) != NULL; i++) {
+        for (i = 0; (buffer_id = params[i]); i++) {
             if (*buffer_id) {
                 if (*buffer_id >= '0' && *buffer_id <= '7') {
                     sel = (Atom) ((int) XA_CUT_BUFFER0 + (int) (*buffer_id - '0'));
@@ -389,7 +389,7 @@ script_handler_search(spif_charptr_t *params)
     static char *search = NULL;
 
     if (params && *params) {
-        if (search != NULL) {
+        if (search) {
             FREE(search);
         }
         search = STRDUP(*params);
@@ -740,7 +740,7 @@ script_parse(char *s)
     D_SCRIPT(("Parsing:  \"%s\"\n", s));
 
     token_list = spiftool_split(";", s);
-    if (token_list == NULL) {
+    if (!token_list) {
         D_SCRIPT(("No tokens found; ignoring script.\n"));
         return;
     }
@@ -751,7 +751,7 @@ script_parse(char *s)
         if (!(*pstr)) {
             continue;
         }
-        if ((params = strchr(pstr, '(')) != NULL) {
+        if ((params = strchr(pstr, '('))) {
             if (params != pstr) {
                 len = params - pstr;
                 func_name = (char *) MALLOC(len + 1);
@@ -771,7 +771,7 @@ script_parse(char *s)
         }
         if (params) {
             params++;
-            if ((tmp = strrchr(params, ')')) != NULL) {
+            if ((tmp = strrchr(params, ')'))) {
                 *tmp = 0;
             } else {
                 libast_print_error("Error in script \"%s\":  Missing closing parentheses for \"%s\".\n", s, token_list[i]);
@@ -783,7 +783,7 @@ script_parse(char *s)
             param_list = NULL;
         }
         D_SCRIPT(("Calling function %s with parameters:  %s\n", func_name, NONULL(params)));
-        if ((func = script_find_handler(func_name)) != NULL) {
+        if ((func = script_find_handler(func_name))) {
             (func->handler) (param_list);
         } else {
             libast_print_error("Error in script \"%s\":  No such function \"%s\".\n", s, func_name);
diff --git a/src/scrollbar.c b/src/scrollbar.c
index 1723931..2c3fc3b 100644
--- a/src/scrollbar.c
+++ b/src/scrollbar.c
@@ -357,7 +357,7 @@ sb_handle_motion_notify(event_t *ev)
 unsigned char
 scrollbar_dispatch_event(event_t *ev)
 {
-    if (scrollbar_event_data.handlers[ev->type] != NULL) {
+    if (scrollbar_event_data.handlers[ev->type]) {
         return ((scrollbar_event_data.handlers[ev->type]) (ev));
     }
     return (0);
diff --git a/src/startup.c b/src/startup.c
index 6f54066..576c60f 100644
--- a/src/startup.c
+++ b/src/startup.c
@@ -95,7 +95,7 @@ eterm_bootstrap(int argc, char *argv[])
     init_libast();
 
     /* Open display, get options/resources and create the window */
-    if (getenv("DISPLAY") != NULL) {
+    if (getenv("DISPLAY")) {
         display_name = STRDUP(getenv("DISPLAY"));
     }
 
@@ -160,7 +160,7 @@ eterm_bootstrap(int argc, char *argv[])
     props[PROP_EWMH_STATE] = XInternAtom(Xdisplay, "_NET_WM_STATE", False);
     props[PROP_EWMH_STATE_STICKY] = XInternAtom(Xdisplay, "_NET_WM_STATE_STICKY", False);
 
-    if ((theme_dir = spifconf_parse_theme(&rs_theme, THEME_CFG, PARSE_TRY_ALL)) != NULL) {
+    if ((theme_dir = spifconf_parse_theme(&rs_theme, THEME_CFG, PARSE_TRY_ALL))) {
         char *tmp;
 
         D_OPTIONS(("spifconf_parse_theme() returned \"%s\"\n", theme_dir));
@@ -168,9 +168,7 @@ eterm_bootstrap(int argc, char *argv[])
         sprintf(tmp, "ETERM_THEME_ROOT=%s", theme_dir);
         putenv(tmp);
     }
-    if ((user_dir =
-         spifconf_parse_theme(&rs_theme, (rs_config_file ? rs_config_file : USER_CFG),
-                          (PARSE_TRY_USER_THEME | PARSE_TRY_NO_THEME))) != NULL) {
+    if ((user_dir = spifconf_parse_theme(&rs_theme, (rs_config_file ? rs_config_file : USER_CFG), (PARSE_TRY_USER_THEME | PARSE_TRY_NO_THEME)))) {
         char *tmp;
 
         D_OPTIONS(("spifconf_parse_theme() returned \"%s\"\n", user_dir));
@@ -268,7 +266,7 @@ eterm_bootstrap(int argc, char *argv[])
 #endif
 
     val = XDisplayString(Xdisplay);
-    if (display_name == NULL) {
+    if (!display_name) {
         display_name = val;
     }
 
@@ -292,7 +290,7 @@ eterm_bootstrap(int argc, char *argv[])
         putenv("COLORTERM_BCE=" COLORTERMENV "-mono");
         putenv("TERM=" TERMENV);
     } else {
-        if (rs_term_name != NULL) {
+        if (rs_term_name) {
             i = strlen(rs_term_name);
             term_string = MALLOC(i + 6);
 
diff --git a/src/term.c b/src/term.c
index 8435da1..44a4d29 100644
--- a/src/term.c
+++ b/src/term.c
@@ -473,7 +473,7 @@ lookup_key(XEvent * ev)
         PrivMode((!numlock_state), PrivMode_aplKP);
     }
 #ifdef USE_XIM
-    if (xim_input_context != NULL) {
+    if (xim_input_context) {
         Status status_return;
 
         kbuf[0] = '\0';
@@ -680,7 +680,7 @@ lookup_key(XEvent * ev)
         if (keysym >= 0xff00 && keysym <= 0xffff) {
 #ifdef KEYSYM_ATTRIBUTE
             /* The "keysym" attribute in the config file gets handled here. */
-            if (!(shft | ctrl) && KeySym_map[keysym - 0xff00] != NULL) {
+            if (!(shft | ctrl) && KeySym_map[keysym - 0xff00]) {
 
                 const unsigned char *tmpbuf;
                 unsigned int len;
@@ -1080,7 +1080,7 @@ popen_printer(void)
         libast_print_warning("Running setuid/setgid.  Refusing to use custom printpipe.\n");
         RESET_AND_ASSIGN(rs_print_pipe, STRDUP(PRINTPIPE));
     }
-    if ((stream = (FILE *) popen(rs_print_pipe, "w")) == NULL) {
+    if (!(stream = (FILE *)popen(rs_print_pipe, "w"))) {
         libast_print_error("Can't open printer pipe \"%s\" -- %s\n", rs_print_pipe, strerror(errno));
     }
     return stream;
@@ -1102,7 +1102,7 @@ process_print_pipe(void)
     int index;
     FILE *fd;
 
-    if ((fd = popen_printer()) != NULL) {
+    if ((fd = popen_printer())) {
         for (index = 0; index < 4; /* nil */ ) {
             unsigned char ch = cmd_getc();
 
@@ -2081,7 +2081,7 @@ append_to_title(const char *str)
     REQUIRE(str != NULL);
 
     XFetchName(Xdisplay, TermWin.parent, &name);
-    if (name != NULL) {
+    if (name) {
         buff = (char *) MALLOC(strlen(name) + strlen(str) + 1);
         strcpy(buff, name);
         strcat(buff, str);
@@ -2098,7 +2098,7 @@ append_to_icon_name(const char *str)
     REQUIRE(str != NULL);
 
     XGetIconName(Xdisplay, TermWin.parent, &name);
-    if (name != NULL) {
+    if (name) {
         buff = (char *) MALLOC(strlen(name) + strlen(str) + 1);
         strcpy(buff, name);
         strcat(buff, str);
@@ -2158,19 +2158,19 @@ xterm_seq(int op, const char *str)
             set_title(str);
             break;
         case ESCSEQ_XTERM_PROP:        /* 3 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) == NULL) {
+            if (!(nstr = (char *)strsep(&tnstr, ";"))) {
                 break;
             }
-            if ((valptr = strchr(nstr, '=')) != NULL) {
+            if ((valptr = strchr(nstr, '='))) {
                 *(valptr++) = 0;
             }
             set_text_property(TermWin.parent, nstr, valptr);
             break;
         case ESCSEQ_XTERM_CHANGE_COLOR:        /* Changing existing colors 256 */
-            while ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            while ((nstr = (char *)strsep(&tnstr, ";"))) {
                 i = (unsigned int) strtoul(nstr, (char **) NULL, 0);
                 nstr = (char *) strsep(&tnstr, ";");
-                if ((i < 256) && (nstr != NULL)) {
+                if ((i < 256) && (nstr)) {
                     D_COLORS(("Changing color : [%d] -> %s\n", i, nstr));
                     set_window_color(i, nstr);
                 }
@@ -2256,7 +2256,7 @@ xterm_seq(int op, const char *str)
                 case 1:
                     changed = 0;
                     for (; 1;) {
-                        if ((color = (char *) strsep(&tnstr, ";")) == NULL) {
+                        if (!(color = (char *)strsep(&tnstr, ";"))) {
                             break;
                         }
                         which = image_max;
@@ -2264,13 +2264,13 @@ xterm_seq(int op, const char *str)
                                       which = idx; break;}
                         );
                         if (which != image_max) {
-                            if ((color = (char *) strsep(&tnstr, ";")) == NULL) {
+                            if (!(color = (char *)strsep(&tnstr, ";"))) {
                                 break;
                             }
                         } else {
                             which = image_bg;
                         }
-                        if ((mod = (char *) strsep(&tnstr, ";")) == NULL) {
+                        if (!(mod = (char *)strsep(&tnstr, ";"))) {
                             break;
                         }
                         if (!strcasecmp(mod, "clear")) {
@@ -2297,7 +2297,7 @@ xterm_seq(int op, const char *str)
                             changed = 1;
                             continue;
                         }
-                        if ((valptr = (char *) strsep(&tnstr, ";")) == NULL) {
+                        if (!(valptr = (char *)strsep(&tnstr, ";"))) {
                             break;
                         }
                         D_CMD(("Modifying the %s attribute of the %s color modifier of the %s image to be %s\n",
@@ -2314,7 +2314,7 @@ xterm_seq(int op, const char *str)
                         if (!strcasecmp(color, "image")) {
                             imlib_t *iml = images[which].current->iml;
 
-                            if (iml->mod == NULL) {
+                            if (!iml->mod) {
                                 iml->mod = create_colormod();
                             }
                             if (!BEG_STRCASECMP(mod, "brightness")) {
@@ -2331,7 +2331,7 @@ xterm_seq(int op, const char *str)
                         } else if (!strcasecmp(color, "red")) {
                             imlib_t *iml = images[which].current->iml;
 
-                            if (iml->rmod == NULL) {
+                            if (!iml->rmod) {
                                 iml->rmod = create_colormod();
                             }
                             if (!BEG_STRCASECMP(mod, "brightness")) {
@@ -2348,7 +2348,7 @@ xterm_seq(int op, const char *str)
                         } else if (!strcasecmp(color, "green")) {
                             imlib_t *iml = images[which].current->iml;
 
-                            if (iml->gmod == NULL) {
+                            if (!iml->gmod) {
                                 iml->gmod = create_colormod();
                             }
                             if (!BEG_STRCASECMP(mod, "brightness")) {
@@ -2365,7 +2365,7 @@ xterm_seq(int op, const char *str)
                         } else if (!strcasecmp(color, "blue")) {
                             imlib_t *iml = images[which].current->iml;
 
-                            if (iml->bmod == NULL) {
+                            if (!iml->bmod) {
                                 iml->bmod = create_colormod();
                             }
                             if (!BEG_STRCASECMP(mod, "bright")) {
@@ -2387,14 +2387,14 @@ xterm_seq(int op, const char *str)
                 case 2:
                     changed = 0;
                     which = image_max;
-                    if ((nstr = (char *) strsep(&tnstr, ";")) == NULL || (valptr = (char *) strsep(&tnstr, ";")) == NULL) {
+                    if (!(nstr = (char *)strsep(&tnstr, ";")) || !(valptr = (char *)strsep(&tnstr, ";"))) {
                         break;
                     }
                     FOREACH_IMAGE(if (!strcasecmp(valptr, (get_image_type(idx) + 6))) {
                                   which = idx; break;}
                     );
                     if (which != image_max) {
-                        if ((valptr = (char *) strsep(&tnstr, ";")) == NULL) {
+                        if (!(valptr = (char *)strsep(&tnstr, ";"))) {
                             break;
                         }
                     } else {
@@ -2408,7 +2408,7 @@ xterm_seq(int op, const char *str)
                         s = (int) strtol(valptr, (char **) NULL, 0);
                         s = ((100 - s) << 8) / 100;
                         if (s == 0x100) {
-                            if (iml->mod != NULL) {
+                            if (iml->mod) {
                                 if (iml->mod->brightness != 0x100) {
                                     iml->mod->brightness = 0x100;
                                     changed = 1;
@@ -2418,7 +2418,7 @@ xterm_seq(int op, const char *str)
                                 }
                             }
                         } else {
-                            if (iml->mod == NULL) {
+                            if (!iml->mod) {
                                 iml->mod = create_colormod();
                             }
                             if (iml->mod->brightness != s) {
@@ -2438,7 +2438,7 @@ xterm_seq(int op, const char *str)
                         }
                         r = (t & 0xff0000) >> 16;
                         if (r == 0xff) {
-                            if (iml->rmod != NULL) {
+                            if (iml->rmod) {
                                 if (iml->rmod->brightness != 0x100) {
                                     iml->rmod->brightness = 0x100;
                                     changed = 1;
@@ -2448,7 +2448,7 @@ xterm_seq(int op, const char *str)
                                 }
                             }
                         } else {
-                            if (iml->rmod == NULL) {
+                            if (!iml->rmod) {
                                 iml->rmod = create_colormod();
                             }
                             if (iml->rmod->brightness != (int) r) {
@@ -2458,7 +2458,7 @@ xterm_seq(int op, const char *str)
                         }
                         g = (t & 0xff00) >> 8;
                         if (g == 0xff) {
-                            if (iml->gmod != NULL) {
+                            if (iml->gmod) {
                                 if (iml->gmod->brightness != 0x100) {
                                     iml->gmod->brightness = 0x100;
                                     changed = 1;
@@ -2468,7 +2468,7 @@ xterm_seq(int op, const char *str)
                                 }
                             }
                         } else {
-                            if (iml->gmod == NULL) {
+                            if (!iml->gmod) {
                                 iml->gmod = create_colormod();
                             }
                             if (iml->gmod->brightness != (int) g) {
@@ -2478,7 +2478,7 @@ xterm_seq(int op, const char *str)
                         }
                         b = t & 0xff;
                         if (b == 0xff) {
-                            if (iml->bmod != NULL) {
+                            if (iml->bmod) {
                                 if (iml->bmod->brightness != 0x100) {
                                     iml->bmod->brightness = 0x100;
                                     changed = 1;
@@ -2488,7 +2488,7 @@ xterm_seq(int op, const char *str)
                                 }
                             }
                         } else {
-                            if (iml->bmod == NULL) {
+                            if (!iml->bmod) {
                                 iml->bmod = create_colormod();
                                 iml->bmod->contrast = iml->bmod->gamma = 0x100;
                             }
@@ -2709,54 +2709,54 @@ xterm_seq(int op, const char *str)
 
 #ifdef XTERM_COLOR_CHANGE
         case ESCSEQ_XTERM_FGCOLOR:     /* 10 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 set_window_color(fgColor, nstr);
             }
             /* drop */
         case ESCSEQ_XTERM_BGCOLOR:     /* 11 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 set_window_color(bgColor, nstr);
             }
             /* drop */
         case ESCSEQ_XTERM_CURSOR_COLOR:        /* 12 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
 # ifndef NO_CURSORCOLOR
                 set_window_color(cursorColor, nstr);
 # endif
             }
             /* drop */
         case ESCSEQ_XTERM_PTR_FGCOLOR: /* 13 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 set_pointer_colors(nstr, NULL);
             }
             /* drop */
         case ESCSEQ_XTERM_PTR_BGCOLOR: /* 14 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 /* UNSUPPORTED */
             }
             /* drop */
         case ESCSEQ_XTERM_TEK_FGCOLOR: /* 15 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 /* UNSUPPORTED */
             }
             /* drop */
         case ESCSEQ_XTERM_TEK_BGCOLOR: /* 16 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 /* UNSUPPORTED */
             }
             /* drop */
         case ESCSEQ_XTERM_HILIGHT_COLOR:       /* 17 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 /* UNSUPPORTED */
             }
             /* drop */
         case ESCSEQ_XTERM_BOLD_COLOR:  /* 18 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 set_window_color(colorBD, nstr);
             }
             /* drop */
         case ESCSEQ_XTERM_ULINE_COLOR: /* 19 */
-            if ((nstr = (char *) strsep(&tnstr, ";")) != NULL) {
+            if ((nstr = (char *)strsep(&tnstr, ";"))) {
                 set_window_color(colorUL, nstr);
             }
 #endif
diff --git a/src/utmp.c b/src/utmp.c
index f946514..32c6745 100644
--- a/src/utmp.c
+++ b/src/utmp.c
@@ -181,7 +181,7 @@ remove_utmp_entry(void)
     setutent();
     strncpy(utmp.ut_id, ut_id, sizeof(utmp.ut_id));
     utmp.ut_type = USER_PROCESS;
-    if (getutid(&utmp) == NULL) {
+    if (!getutid(&utmp)) {
         return;
     }
     utmp.ut_type = DEAD_PROCESS;
@@ -204,7 +204,7 @@ remove_utmp_entry(void)
      * The following code waw copied from the poeigl-1.20 login/init package.
      * Special thanks to poe for the code examples.
      */
-    while ((putmp = getutent()) != NULL) {
+    while ((putmp = getutent())) {
         if (putmp->ut_pid == pid) {
             putmp->ut_type = DEAD_PROCESS;
             putmp->ut_pid = 0;
@@ -286,10 +286,10 @@ get_tslot(const char *ttyname)
     char buf[256], name[256];
     FILE *fd;
 
-    if ((fd = fopen(UTMP_FILENAME, "r")) != NULL) {
+    if ((fd = fopen(UTMP_FILENAME, "r"))) {
         int i;
 
-        for (i = 1; fgets(buf, sizeof(buf), fd) != NULL; i++) {
+        for (i = 1; fgets(buf, sizeof(buf), fd); i++) {
             if (*buf == '#' || sscanf(buf, "%s", name) != 1)
                 continue;
             if (!strcmp(ttyname, name)) {
@@ -313,7 +313,7 @@ write_utmp(struct utmp *putmp)
 
     fprintf(stderr, "Utmp file is %s\n", UTMP_FILENAME);
     privileges(INVOKE);
-    if ((fd = fopen(UTMP_FILENAME, "r+")) != NULL) {
+    if ((fd = fopen(UTMP_FILENAME, "r+"))) {
         utmp_pos = get_tslot(putmp->ut_line) * sizeof(struct utmp);
 
         if (utmp_pos >= 0) {
@@ -384,7 +384,7 @@ remove_utmp_entry(void)
     FILE *fd;
 
     privileges(INVOKE);
-    if (!ut_id[0] && (fd = fopen(UTMP_FILENAME, "r+")) != NULL) {
+    if (!ut_id[0] && (fd = fopen(UTMP_FILENAME, "r+"))) {
         struct utmp utmp;
         MEMSET(&utmp, 0, sizeof(struct utmp));
 
diff --git a/src/windows.c b/src/windows.c
index a9cff63..7c946aa 100644
--- a/src/windows.c
+++ b/src/windows.c
@@ -69,7 +69,7 @@ set_text_property(Window win, char *propname, char *value)
 
     ASSERT(propname != NULL);
 
-    if (value == NULL) {
+    if (!value) {
         atom = XInternAtom(Xdisplay, propname, True);
         if (atom == None) {
             return;
@@ -189,8 +189,8 @@ get_color_by_name(const char *name, const char *fallback)
 {
     XColor xcol;
 
-    if (name == NULL) {
-        if (fallback == NULL) {
+    if (!name) {
+        if (!fallback) {
             return ((Pixel) - 1);
         } else {
             name = fallback;
@@ -348,13 +348,13 @@ set_pointer_colors(const char *fg_name, const char *bg_name)
 {
     XColor fg, bg;
 
-    if (fg_name != NULL) {
+    if (fg_name) {
         fg.pixel = get_color_by_name(fg_name, COLOR_NAME(pointerColor));
     } else {
         fg.pixel = PixColors[pointerColor];
     }
     XQueryColor(Xdisplay, cmap, &fg);
-    if (bg_name != NULL) {
+    if (bg_name) {
         bg.pixel = get_color_by_name(bg_name, COLOR_NAME(bgColor));
     } else {
         bg.pixel = PixColors[bgColor];
@@ -735,7 +735,7 @@ set_window_color(int idx, const char *color)
 
     D_X11(("idx == %d, color == \"%s\"\n", idx, NONULL(color)));
 
-    if (color == NULL || *color == '\0')
+    if (!color || *color == '\0')
         return;
 
     /* handle color aliases */
diff --git a/utils/Esetroot.c b/utils/Esetroot.c
index dbe6b37..137987e 100644
--- a/utils/Esetroot.c
+++ b/utils/Esetroot.c
@@ -181,7 +181,7 @@ main(int argc, char *argv[])
     imlib_context_set_display(Xdisplay);
     imlib_context_set_visual(DefaultVisual(Xdisplay, DefaultScreen(Xdisplay)));
     im = imlib_load_image_immediately(fname);
-    if (im == NULL) {
+    if (!im) {
         fprintf(stderr, "%s:  Unable to load image file \"%s\".\n", *argv, fname);
         exit(1);
     } else if (debug) {