Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/common/tuklib_exit.c

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       tuklib_exit.c
+/// \brief      Close stdout and stderr, and exit
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "tuklib_common.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "tuklib_gettext.h"
+#include "tuklib_progname.h"
+#include "tuklib_exit.h"
+
+
+extern void
+tuklib_exit(int status, int err_status, int show_error)
+{
+        if (status != err_status) {
+                // Close stdout. If something goes wrong,
+                // print an error message to stderr.
+                const int ferror_err = ferror(stdout);
+                const int fclose_err = fclose(stdout);
+                if (ferror_err || fclose_err) {
+                        status = err_status;
+
+                        // If it was fclose() that failed, we have the reason
+                        // in errno. If only ferror() indicated an error,
+                        // we have no idea what the reason was.
+                        if (show_error)
+                                fprintf(stderr, "%s: %s: %s\n", progname,
+                                                _("Writing to standard "
+                                                        "output failed"),
+                                                fclose_err ? strerror(errno)
+                                                        : _("Unknown error"));
+                }
+        }
+
+        if (status != err_status) {
+                // Close stderr. If something goes wrong, there's
+                // nothing where we could print an error message.
+                // Just set the exit status.
+                const int ferror_err = ferror(stderr);
+                const int fclose_err = fclose(stderr);
+                if (fclose_err || ferror_err)
+                        status = err_status;
+        }
+
+        exit(status);
+}