Try fix of compile warnings about assigned but unused variables

...as returned values of functions declared with attribute
warn_unused_result [-Wunused-result].

Signed-off-by: Slava Zanko <slavazanko@gmail.com>

lib/util.c

@@ -208,9 +208,8 @@ mc_util_write_backup_content (const char *from_file_name, const char *to_file_na
     if (fwrite ((const void *) contents, 1, length, backup_fd) != length)
         ret1 = FALSE;
     {
-        int ret2;
+        (void) fflush (backup_fd);
-        ret2 = fflush (backup_fd);
+        (void) fclose (backup_fd);
-        ret2 = fclose (backup_fd);
     }
     g_free (contents);
     return ret1;

lib/vfs/direntry.c

@@ -1523,10 +1523,8 @@ vfs_s_get_line (struct vfs_class *me, int sock, char *buf, int buf_len, char ter
     {
         if (logfile)
         {
-            size_t ret1;
+            (void) fwrite (&c, 1, 1, logfile);
-            int ret2;
+            (void) fflush (logfile);
-            ret1 = fwrite (&c, 1, 1, logfile);
-            ret2 = fflush (logfile);
         }
         if (c == '\n')
             return 1;

src/background.c

@@ -200,7 +200,7 @@ background_attention (int fd, void *closure)
     /*    void *routine; */
     int argc, i, result, status;
     char *data[MAXCALLARGS];
-    ssize_t bytes, ret;
+    ssize_t bytes;
     struct TaskList *p;
     int to_child_fd = -1;
     enum ReturnType type;
@@ -330,9 +330,9 @@ background_attention (int fd, void *closure)
             }
 
         /* Send the result code and the value for shared variables */
-        ret = write (to_child_fd, &result, sizeof (int));
+        (void) write (to_child_fd, &result, sizeof (int));
         if (have_ctx && to_child_fd != -1)
-            ret = write (to_child_fd, ctx, sizeof (FileOpContext));
+            (void) write (to_child_fd, ctx, sizeof (FileOpContext));
     }
     else if (type == Return_String)
     {
@@ -365,15 +365,15 @@ background_attention (int fd, void *closure)
         if (resstr)
         {
             len = strlen (resstr);
-            ret = write (to_child_fd, &len, sizeof (len));
+            (void) write (to_child_fd, &len, sizeof (len));
             if (len != 0)
-                ret = write (to_child_fd, resstr, len);
+                (void) write (to_child_fd, resstr, len);
             g_free (resstr);
         }
         else
         {
             len = 0;
-            ret = write (to_child_fd, &len, sizeof (len));
+            (void) write (to_child_fd, &len, sizeof (len));
         }
     }
     for (i = 0; i < argc; i++)
@@ -398,17 +398,16 @@ static void
 parent_call_header (void *routine, int argc, enum ReturnType type, FileOpContext * ctx)
 {
     int have_ctx;
-    ssize_t ret;
 
     have_ctx = (ctx != NULL);
 
-    ret = write (parent_fd, &routine, sizeof (routine));
+    (void) write (parent_fd, &routine, sizeof (routine));
-    ret = write (parent_fd, &argc, sizeof (int));
+    (void) write (parent_fd, &argc, sizeof (int));
-    ret = write (parent_fd, &type, sizeof (type));
+    (void) write (parent_fd, &type, sizeof (type));
-    ret = write (parent_fd, &have_ctx, sizeof (have_ctx));
+    (void) write (parent_fd, &have_ctx, sizeof (have_ctx));
 
     if (have_ctx)
-        ret = write (parent_fd, ctx, sizeof (FileOpContext));
+        (void) write (parent_fd, ctx, sizeof (FileOpContext));
 }
 
 /* --------------------------------------------------------------------------------------------- */
@@ -417,7 +416,6 @@ static int
 parent_va_call (void *routine, gpointer data, int argc, va_list ap)
 {
     int i;
-    ssize_t ret;
     struct FileOpContext *ctx = (struct FileOpContext *) data;
 
     parent_call_header (routine, argc, Return_Integer, ctx);
@@ -428,13 +426,13 @@ parent_va_call (void *routine, gpointer data, int argc, va_list ap)
 
         len = va_arg (ap, int);
         value = va_arg (ap, void *);
-        ret = write (parent_fd, &len, sizeof (int));
+        (void) write (parent_fd, &len, sizeof (int));
-        ret = write (parent_fd, value, len);
+        (void) write (parent_fd, value, len);
     }
 
-    ret = read (from_parent_fd, &i, sizeof (int));
+    (void) read (from_parent_fd, &i, sizeof (int));
     if (ctx)
-        ret = read (from_parent_fd, ctx, sizeof (FileOpContext));
+        (void) read (from_parent_fd, ctx, sizeof (FileOpContext));
 
     return i;
 }

src/clipboard.c

@@ -66,7 +66,6 @@ clipboard_file_to_ext_clip (const gchar * event_group_name, const gchar * event_
                             gpointer init_data, gpointer data)
 {
     char *tmp, *cmd;
-    int res = 0;
     const char *d = getenv ("DISPLAY");
 
     (void) event_group_name;
@@ -81,7 +80,7 @@ clipboard_file_to_ext_clip (const gchar * event_group_name, const gchar * event_
     cmd = g_strconcat (clipboard_store_path, " ", tmp, " 2>/dev/null", (char *) NULL);
 
     if (cmd != NULL)
-        res = my_system (EXECUTE_AS_SHELL, shell, cmd);
+        (void) my_system (EXECUTE_AS_SHELL, shell, cmd);
 
     g_free (cmd);
     g_free (tmp);
@@ -127,7 +126,6 @@ clipboard_text_to_file (const gchar * event_group_name, const gchar * event_name
 {
     int file;
     vfs_path_t *fname_vpath = NULL;
-    ssize_t ret;
     size_t str_len;
     const char *text = (const char *) data;
 
@@ -147,7 +145,7 @@ clipboard_text_to_file (const gchar * event_group_name, const gchar * event_name
         return TRUE;
 
     str_len = strlen (text);
-    ret = mc_write (file, (char *) text, str_len);
+    (void) mc_write (file, (char *) text, str_len);
     mc_close (file);
     return TRUE;
 }

src/cons.handler.c

@@ -90,7 +90,6 @@ show_console_contents_linux (int starty, unsigned char begin_line, unsigned char
     unsigned char message = 0;
     unsigned short bytes = 0;
     int i;
-    ssize_t ret;
 
     /* Is tty console? */
     if (mc_global.tty.console_flag == '\0')
@@ -105,29 +104,29 @@ show_console_contents_linux (int starty, unsigned char begin_line, unsigned char
 
     /* Send command to the console handler */
     message = CONSOLE_CONTENTS;
-    ret = write (pipefd1[1], &message, 1);
+    (void) write (pipefd1[1], &message, 1);
     /* Check for outdated cons.saver */
-    ret = read (pipefd2[0], &message, 1);
+    (void) read (pipefd2[0], &message, 1);
     if (message != CONSOLE_CONTENTS)
         return;
 
     /* Send the range of lines that we want */
-    ret = write (pipefd1[1], &begin_line, 1);
+    (void) write (pipefd1[1], &begin_line, 1);
-    ret = write (pipefd1[1], &end_line, 1);
+    (void) write (pipefd1[1], &end_line, 1);
     /* Read the corresponding number of bytes */
-    ret = read (pipefd2[0], &bytes, 2);
+    (void) read (pipefd2[0], &bytes, 2);
 
     /* Read the bytes and output them */
     for (i = 0; i < bytes; i++)
     {
         if ((i % COLS) == 0)
             tty_gotoyx (starty + (i / COLS), 0);
-        ret = read (pipefd2[0], &message, 1);
+        (void) read (pipefd2[0], &message, 1);
         tty_print_char (message);
     }
 
     /* Read the value of the mc_global.tty.console_flag */
-    ret = read (pipefd2[0], &message, 1);
+    (void) read (pipefd2[0], &message, 1);
 }
 
 /* --------------------------------------------------------------------------------------------- */
@@ -240,10 +239,9 @@ handle_console_linux (console_action_t action)
         if (action == CONSOLE_DONE || mc_global.tty.console_flag == '\0')
         {
             /* We are done -> Let's clean up */
-            pid_t ret;
             close (pipefd1[1]);
             close (pipefd2[0]);
-            ret = waitpid (cons_saver_pid, &status, 0);
+            (void) waitpid (cons_saver_pid, &status, 0);
             mc_global.tty.console_flag = '\0';
         }
         break;

src/consaver/cons.saver.c

@@ -143,8 +143,7 @@ send_contents (char *buffer, unsigned int columns, unsigned int rows)
 static void __attribute__ ((noreturn)) die (void)
 {
     unsigned char zero = 0;
-    ssize_t ret;
+    (void) write (1, &zero, 1);
-    ret = write (1, &zero, 1);
     exit (3);
 }
 

src/diffviewer/ydiff.c

@@ -2148,7 +2148,6 @@ static void
 do_merge_hunk (WDiff * dview)
 {
     int from1, to1, from2, to2;
-    int res;
     int hunk;
 
     hunk = get_current_hunk (dview, &from1, &to1, &from2, &to2);
@@ -2195,7 +2194,7 @@ do_merge_hunk (WDiff * dview)
         }
         fflush (merge_file);
         fclose (merge_file);
-        res = rewrite_backup_content (merge_file_name_vpath, dview->file[0]);
+        rewrite_backup_content (merge_file_name_vpath, dview->file[0]);
         mc_unlink (merge_file_name_vpath);
         vfs_path_free (merge_file_name_vpath);
     }
@@ -2977,7 +2976,7 @@ dview_ok_to_exit (WDiff * dview)
         break;
     case 1:                    /* No */
         if (mc_util_restore_from_backup_if_possible (dview->file[0], "~~~"))
-            res = mc_util_unlink_backup_if_possible (dview->file[0], "~~~");
+            mc_util_unlink_backup_if_possible (dview->file[0], "~~~");
         /* fall through */
     default:
         res = TRUE;

src/filemanager/find.c

@@ -1694,10 +1694,9 @@ do_find (const char *start_dir, ssize_t start_dir_len, const char *ignore_dirs,
             /* absolute path */
             if (start_dir_len < 0)
             {
-                int ret;
                 vfs_path_free (current_panel->cwd_vpath);
                 current_panel->cwd_vpath = vfs_path_from_str (PATH_SEP_STR);
-                ret = chdir (PATH_SEP_STR);
+                chdir (PATH_SEP_STR);
             }
             panelize_save_panel (current_panel);
         }

src/filemanager/panel.c

@@ -4123,7 +4123,7 @@ panel_new_with_dir (const char *panel_name, const char *wpath)
         vfs_path_t *vpath;
 
         vpath = vfs_path_from_str (curdir);
-        err = mc_chdir (vpath);
+        mc_chdir (vpath);
         vfs_path_free (vpath);
     }
     g_free (curdir);

src/filemanager/panelize.c

@@ -388,9 +388,8 @@ do_external_panelize (char *command)
         current_panel->count = next_free;
         if (list->list[0].fname[0] == PATH_SEP)
         {
-            int ret;
             panel_set_cwd (current_panel, PATH_SEP_STR);
-            ret = chdir (PATH_SEP_STR);
+            chdir (PATH_SEP_STR);
         }
     }
     else

src/filemanager/tree.c

@@ -739,7 +739,6 @@ static void
 tree_rescan (void *data)
 {
     WTree *tree = data;
-    int ret;
     vfs_path_t *old_vpath;
 
     old_vpath = vfs_path_clone (vfs_get_raw_current_dir ());
@@ -749,7 +748,7 @@ tree_rescan (void *data)
     if (tree->selected_ptr != NULL && mc_chdir (tree->selected_ptr->name) == 0)
     {
         tree_store_rescan (tree->selected_ptr->name);
-        ret = mc_chdir (old_vpath);
+        mc_chdir (old_vpath);
     }
     vfs_path_free (old_vpath);
 }

src/main.c

@@ -603,10 +603,8 @@ main (int argc, char *argv[])
                            S_IRUSR | S_IWUSR);
         if (last_wd_fd != -1)
         {
-            ssize_t ret1;
+            (void) write (last_wd_fd, last_wd_string, strlen (last_wd_string));
-            int ret2;
+            (void) close (last_wd_fd);
-            ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
-            ret2 = close (last_wd_fd);
         }
     }
     g_free (last_wd_string);

src/subshell.c

@@ -252,10 +252,7 @@ init_subshell_child (const char *pty_name)
 
     /* It simplifies things to change to our home directory here, */
     /* and the user's startup file may do a `cd' command anyway   */
-    {
+    chdir (mc_config_get_home_dir ());        /* FIXME? What about when we re-run the subshell? */
-        int ret;
-        ret = chdir (mc_config_get_home_dir ());        /* FIXME? What about when we re-run the subshell? */
-    }
 
     /* Set MC_SID to prevent running one mc from another */
     mc_sid = getsid (0);

src/vfs/fish/fish.c

@@ -251,9 +251,8 @@ fish_command (struct vfs_class *me, struct vfs_s_super *super, int wait_reply, c
 
     if (logfile)
     {
-        size_t ret;
+        (void) fwrite (str, strlen (str), 1, logfile);
-        ret = fwrite (str, strlen (str), 1, logfile);
+        (void) fflush (logfile);
-        ret = fflush (logfile);
     }
 
     tty_enable_interrupt_key ();
@@ -330,13 +329,13 @@ fish_pipeopen (struct vfs_s_super *super, const char *path, const char *argv[])
     }
     else
     {
-        res = dup2 (fileset1[0], 0);
+        (void) dup2 (fileset1[0], 0);
         close (fileset1[0]);
         close (fileset1[1]);
-        res = dup2 (fileset2[1], 1);
+        (void) dup2 (fileset2[1], 1);
         close (2);
         /* stderr to /dev/null */
-        res = open ("/dev/null", O_WRONLY);
+        (void) open ("/dev/null", O_WRONLY);
         close (fileset2[0]);
         close (fileset2[1]);
         execvp (path, const_cast (char **, argv));

src/vfs/ftpfs/ftpfs.c

@@ -477,8 +477,7 @@ ftpfs_command (struct vfs_class *me, struct vfs_s_super *super, int wait_reply,
         }
         else
         {
-            size_t ret;
+            (void) fwrite (cmdstr, cmdlen, 1, MEDATA->logfile);
-            ret = fwrite (cmdstr, cmdlen, 1, MEDATA->logfile);
         }
 
         fflush (MEDATA->logfile);