Fix usage and version write error checking.

"fflush (stdout)" is needed to detect most errors (only a closed stdout
could be detected otherwise). A ferror test is also needed to avoid
false positives since the C standard allows errno to be set even in
the absence of errors.

1 files changed, 6 insertions, 2 deletions

diff --git a/main.c b/main.c
index 1f5f530b..b2e129c4 100644
--- a/main.c
+++ b/main.c
@@ -176,7 +176,9 @@ options:\n\
   -Z\t\topen the first folder with new message, exit immediately if none\n\
   -h\t\tthis help message");
 
-  if (errno && errno != EPIPE)
+  fflush (stdout);
+
+  if (ferror (stdout) && errno && errno != EPIPE)
     exit (1);
   exit (0);
 }
@@ -572,7 +574,9 @@ static void show_version (void)
 
   mutt_print_patchlist();
 
-  if (errno && errno != EPIPE)
+  fflush (stdout);
+
+  if (ferror (stdout) && errno && errno != EPIPE)
     exit (1);
   exit (0);
 }