[sysprof] cat: protect against writing binary to TTY

[Christian Hergert <chergert src gnome org>]

commit cdd9a64177c074b2879c7258e07eb49f20bebfa5
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 29 16:05:17 2018 -0700

    cat: protect against writing binary to TTY

 tools/sysprof-cat.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/tools/sysprof-cat.c b/tools/sysprof-cat.c
index f7a1e12..b2e5ac8 100644
--- a/tools/sysprof-cat.c
+++ b/tools/sysprof-cat.c
@@ -115,6 +115,12 @@ main (gint   argc,
   if (argc == 1)
     return 0;
 
+  if (isatty (STDOUT_FILENO))
+    {
+      g_printerr ("stdout is a TTY, refusing to write binary data to stdout.\n");
+      return EXIT_FAILURE;
+    }
+
   for (guint i = 1; i < argc; i++)
     {
       if (!g_file_test (argv[i], G_FILE_TEST_IS_REGULAR))