fix -Wmaybe-unused and -Wstringop-truncation warnings

i3bar/src/ipc.c

@@ -340,8 +340,9 @@ int i3_send_msg(uint32_t type, const char *payload) {
     memcpy(walk, &type, sizeof(uint32_t));
     walk += sizeof(uint32_t);
 
-    if (payload != NULL)
-        strncpy(walk, payload, len);
+    if (payload != NULL) {
+        memcpy(walk, payload, len);
+    }
 
     swrite(i3_connection->fd, buffer, to_write);
 

src/click.c

@@ -39,6 +39,9 @@ static bool tiling_resize_for_border(Con *con, border_t border, xcb_button_press
         case BORDER_BOTTOM:
             search_direction = D_DOWN;
             break;
+        default:
+            ELOG("BUG: invalid border value %d\n", border);
+            return false;
     }
 
     bool res = resize_find_tiling_participants(&first, &second, search_direction, false);

src/commands.c

@@ -1325,7 +1325,7 @@ void cmd_focus_direction(I3_CMD, const char *direction_str) {
     HANDLE_EMPTY_MATCH;
     CMD_FOCUS_WARN_CHILDREN;
 
-    direction_t direction;
+    direction_t direction = D_LEFT;
     position_t position;
     bool auto_direction = true;
     if (strcmp(direction_str, "prev") == 0) {

src/config_parser.c

@@ -919,7 +919,7 @@ parse_file_result_t parse_file(struct parser_ctx *ctx, const char *f, IncludedFi
             continuation = NULL;
         }
 
-        strncpy(buf + strlen(buf), buffer, strlen(buffer) + 1);
+        strcpy(buf + strlen(buf), buffer);
 
         /* Skip comments and empty lines. */
         if (skip_line || comment) {
@@ -1043,7 +1043,7 @@ parse_file_result_t parse_file(struct parser_ctx *ctx, const char *f, IncludedFi
         } else {
             /* Copy until the next variable, then copy its value */
             strncpy(destwalk, walk, distance);
-            strncpy(destwalk + distance, nearest->value, strlen(nearest->value));
+            strcpy(destwalk + distance, nearest->value);
             walk += distance + strlen(nearest->key);
             destwalk += distance + strlen(nearest->value);
         }

src/sd-daemon.c

@@ -340,6 +340,11 @@ int sd_notify(int unset_environment, const char *state) {
         goto finish;
     }
 
+    if (strlen(e) > sizeof(sockaddr.un.sun_path)) {
+        r = -EINVAL;
+        goto finish;
+    }
+
     if ((fd = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0) {
         r = -errno;
         goto finish;
@@ -347,7 +352,7 @@ int sd_notify(int unset_environment, const char *state) {
 
     memset(&sockaddr, 0, sizeof(sockaddr));
     sockaddr.sa.sa_family = AF_UNIX;
-    strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
+    strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path) - 1);
 
     if (sockaddr.un.sun_path[0] == '@')
         sockaddr.un.sun_path[0] = 0;

src/x.c

@@ -731,6 +731,9 @@ void x_draw_decoration(Con *con) {
             /* Make sure the icon does not escape title boundaries */
             icon_offset_x = min(deco_width - icon_size - icon_padding - title_padding, title_offset_x + predict_text_width(title) + icon_padding);
             break;
+        default:
+            ELOG("BUG: invalid config.title_align value %d\n", config.title_align);
+            return;
     }
 
     draw_util_text(title, dest_surface,