Improve init_tty readability

2 files changed, 10 insertions, 2 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 36964f57437..1cce3b5c48e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,10 @@
 2014-03-23  Daniel Colascione  <dancol@dancol.org>
 
+        * term.c (init_tty): Rearrange condition for clarity; print
+        appropriate diagnostic.
+
+2014-03-23  Daniel Colascione  <dancol@dancol.org>
+
         * process.c (DATAGRAM_CONN_P): Don't underflow datagram_address
         array.  (ASAN caught.)
 
diff --git a/src/term.c b/src/term.c
index 773e85faabc..3bcbb70aff6 100644
--- a/src/term.c
+++ b/src/term.c
@@ -4031,12 +4031,15 @@ init_tty (const char *name, const char *terminal_type, bool must_succeed)
        open a frame on the same terminal.  */
     int flags = O_RDWR | O_NOCTTY | (ctty ? 0 : O_IGNORE_CTTY);
     int fd = emacs_open (name, flags, 0);
-    tty->input = tty->output = fd < 0 || ! isatty (fd) ? 0 : fdopen (fd, "w+");
+    tty->input = tty->output =
+      ((fd < 0 || ! isatty (fd))
+       ? NULL
+       : fdopen (fd, "w+"));
 
     if (! tty->input)
       {
         char const *diagnostic
-          = tty->input ? "Not a tty device: %s" : "Could not open file: %s";
+          = (fd < 0) ? "Could not open file: %s" : "Not a tty device: %s";
         emacs_close (fd);
         maybe_fatal (must_succeed, terminal, diagnostic, diagnostic, name);
       }