1 files changed, 87 insertions, 0 deletions
diff --git a/lib/xexit.c b/lib/xexit.c
new file mode 100644
index 0000000..a3244d4
--- /dev/null
+++ b/lib/xexit.c
@@ -0,0 +1,87 @@
+/* xexit.c -- exit with attention to return values and closing stdout.
+   $Id: xexit.c,v 1.8 2007/07/01 21:20:31 karl Exp $
+
+   Copyright (C) 1999, 2003, 2004, 2007 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+
+#include "system.h"
+
+/* SunOS 4.1.1 gets STDC_HEADERS defined, but it doesn't provide
+   EXIT_FAILURE.  So far no system has defined one of EXIT_FAILURE and
+   EXIT_SUCCESS without the other.  */
+#ifdef EXIT_SUCCESS
+ /* The following test is to work around the gross typo in
+    systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
+    is defined to 0, not 1.  */
+# if !EXIT_FAILURE
+#  undef EXIT_FAILURE
+#  define EXIT_FAILURE 1
+# endif
+#else /* not EXIT_SUCCESS */
+# ifdef VMS /* these values suppress some messages; from gnuplot */
+#   define EXIT_SUCCESS 1
+#   define EXIT_FAILURE 0x10000002
+# else /* not VMS */
+#  define EXIT_SUCCESS 0
+#  define EXIT_FAILURE 1
+# endif /* not VMS */
+#endif /* not EXIT_SUCCESS */
+
+
+/* Flush stdout first, exit if failure (therefore, xexit should be
+   called to exit every program, not just `return' from main).
+   Otherwise, if EXIT_STATUS is zero, exit successfully, else
+   unsuccessfully.  */
+
+void
+xexit (int exit_status)
+{
+  if (ferror (stdout))
+    {
+      fputs (_("ferror on stdout\n"), stderr);
+      exit_status = 1;
+    }
+  else if (fflush (stdout) != 0)
+    {
+      fputs (_("fflush error on stdout\n"), stderr);
+      exit_status = 1;
+    }
+
+  exit_status = exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+
+  exit (exit_status);
+}
+
+
+/* Why do we care about stdout you may ask?  Here's why, from Jim
+   Meyering in the lib/closeout.c file.  */
+
+/* If a program writes *anything* to stdout, that program should close
+   stdout and make sure that the close succeeds.  Otherwise, suppose that
+   you go to the extreme of checking the return status of every function
+   that does an explicit write to stdout.  The last printf can succeed in
+   writing to the internal stream buffer, and yet the fclose(stdout) could
+   still fail (due e.g., to a disk full error) when it tries to write
+   out that buffered data.  Thus, you would be left with an incomplete
+   output file and the offending program would exit successfully.
+
+   Besides, it's wasteful to check the return value from every call
+   that writes to stdout -- just let the internal stream state record
+   the failure.  That's what the ferror test is checking below.
+
+   It's important to detect such failures and exit nonzero because many
+   tools (most notably `make' and other build-management systems) depend
+   on being able to detect failure in other tools via their exit status.  */