--- coreutils/coreutils-8.28/src/fmt.c	2017-09-01 00:11:03.000000000 -0700
+++ coreutils_modified/coreutils-8.28/src/fmt.c	2018-12-11 16:18:50.296134362 -0800
@@ -320,7 +320,7 @@
   bool ok = true;
   char const *max_width_option = NULL;
   char const *goal_width_option = NULL;
-
+  struct stat fileinfo;
   initialize_main (&argc, &argv);
   set_program_name (argv[0]);
   setlocale (LC_ALL, "");
@@ -423,27 +423,41 @@
             fmt (stdin);
           else
             {
-              FILE *in_stream;
-              in_stream = fopen (file, "r");
-              if (in_stream != NULL)
-                {
-                  fmt (in_stream);
-                  if (fclose (in_stream) == EOF)
-                    {
-                      error (0, errno, "%s", quotef (file));
-                      ok = false;
+	      if (stat(file, &fileinfo) == 0)
+		{
+		  if (S_ISBLK(fileinfo.st_mode) || S_ISCHR(fileinfo.st_mode) || S_ISFIFO(fileinfo.st_mode))
+		    {
+		      error (0, errno, _("unsupported filetype detected for %s"), quoteaf (file));
+		      ok = false;
+	            }
+		  else
+		    {				
+              	      FILE *in_stream;
+              	      in_stream = fopen (file, "r");
+                      if (in_stream != NULL)
+                        {
+                          fmt (in_stream);
+                          if (fclose (in_stream) == EOF)
+                            {
+                              error (0, errno, "%s", quotef (file));
+                              ok = false;
+                            }
+                        }
+                      else
+                        {
+                          error (0, errno, _("cannot open %s for reading"), quoteaf (file));
+                          ok = false;
+                        }
                     }
-                }
-              else
-                {
-                  error (0, errno, _("cannot open %s for reading"),
-                         quoteaf (file));
-                  ok = false;
-                }
+        	}
+               else
+		{
+ 	          error (0, errno, _("error applying stat on file %s"), quoteaf (file));
+                  ok = false;  	
+		}	
             }
         }
-    }
-
+    }	
   return ok ? EXIT_SUCCESS : EXIT_FAILURE;
 }
 
----------------------------------------------------------------------------------------------------

--- coreutils_modified/coreutils-8.28/tests/fmt/base.pl	2018-12-11 18:17:02.770372487 -0800
+++ coreutils/coreutils-8.28/tests/fmt/base.pl	2017-09-01 00:11:03.000000000 -0700
@@ -35,7 +35,7 @@
      ['bad-suffix', '-72x',	{IN=> ''},
       {ERR => "fmt: invalid width: '72x'\n"}, {EXIT => 1}],
      ['no-file', 'no-such-file',
-      {ERR => "fmt: error applying stat on file 'no-such-file':"
+      {ERR => "fmt: cannot open 'no-such-file' for reading:"
        . " No such file or directory\n"}, {EXIT => 1}],
      ['obs-1', '-c -72',
       {ERR => "fmt: invalid option -- 7; -WIDTH is recognized only when it"