Fix long/short cpu stat init

Fixes brndnmtthws#1630.

src/core.cc

@@ -747,15 +747,14 @@ struct text_object *construct_text_object(char *s, const char *arg, long line,
   END OBJ(diskiograph_write, &update_diskio) parse_diskiograph_arg(obj, arg);
   obj->callbacks.graphval = &diskiographval_write;
 #endif /* BUILD_GUI */
-  END OBJ(color, nullptr)
-  if (false
+  END OBJ(color, nullptr) if (false
 #ifdef BUILD_GUI
-  || out_to_gui(*state)
+                              || out_to_gui(*state)
 #endif /* BUILD_GUI */
 #ifdef BUILD_NCURSES
-  || out_to_ncurses.get(*state)
+                              || out_to_ncurses.get(*state)
 #endif /* BUILD_NCURSES */
-) {
+  ) {
     Colour c = arg != nullptr ? parse_color(arg) : default_color.get(*state);
     obj->data.l = c.to_argb32();
     set_current_text_color(c);
@@ -1058,9 +1057,6 @@ struct text_object *construct_text_object(char *s, const char *arg, long line,
        * nothing else than just that, using an ugly switch(). */
       if (strncmp(s, "top", 3) == EQUAL) {
     if (parse_top_args(s, arg, obj) != 0) {
-#ifdef __linux__
-      determine_longstat_file();
-#endif
       obj->cb_handle = create_cb_handle(update_top);
     } else {
       free(obj);

src/linux.cc

@@ -903,6 +903,10 @@ void determine_longstat_file(void) {
   FILE *stat_fp;
   static int reported = 0;
   char buf[MAX_PROCSTAT_LINELEN + 1];
+  static int stat_initialized = 0;
+
+  /* only execute once */
+  if (stat_initialized) return;
 
   if (!(stat_fp = open_file("/proc/stat", &reported))) return;
   while (!feof(stat_fp) &&
@@ -913,6 +917,7 @@ void determine_longstat_file(void) {
     }
   }
   fclose(stat_fp);
+  stat_initialized = 1;
 }
 
 void get_cpu_count(void) {
@@ -1000,6 +1005,7 @@ int update_stat(void) {
   }
 
   if (!stat_template) {
+    determine_longstat_file();
     stat_template =
         KFLAG_ISSET(KFLAG_IS_LONGSTAT) ? TMPL_LONGSTAT : TMPL_SHORTSTAT;
   }
@@ -1216,8 +1222,7 @@ static void get_dev_path(const char *dir, const char *dev, char *out_buf) {
     if (name_fd < 0) {
       snprintf(path, 512, "%s%s/device/name", dir, namelist[i]->d_name);
       name_fd = open(path, O_RDONLY);
-      if (name_fd < 0)
-        continue;
+      if (name_fd < 0) continue;
     }
     size = read(name_fd, name, strlen(dev));
     if (size < strlen(dev)) {

src/linux.h

@@ -58,8 +58,6 @@ int update_stat(void);
 
 void print_distribution(struct text_object *, char *, unsigned int);
 
-void determine_longstat_file(void);
-
 extern char e_iface[64];
 extern char interfaces_arr[MAX_NET_INTERFACES][64];