1 files changed, 77 insertions, 0 deletions
diff --git a/lib/verror.c b/lib/verror.c
new file mode 100644
index 0000000..6bd365e
--- /dev/null
+++ b/lib/verror.c
@@ -0,0 +1,77 @@
+/* va_list error handler for noninteractive utilities
+   Copyright (C) 2006-2007, 2009-2020 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 <https://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake.  */
+
+#include <config.h>
+
+#include "verror.h"
+#include "xvasprintf.h"
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+#if ENABLE_NLS
+# include "gettext.h"
+# define _(msgid) gettext (msgid)
+#endif
+
+#ifndef _
+# define _(String) String
+#endif
+
+/* Print a message with 'vfprintf (stderr, FORMAT, ARGS)';
+   if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
+   If STATUS is nonzero, terminate the program with 'exit (STATUS)'.
+   Use the globals error_print_progname and error_message_count similarly
+   to error().  */
+void
+verror (int status, int errnum, const char *format, va_list args)
+{
+  verror_at_line (status, errnum, NULL, 0, format, args);
+}
+
+/* Print a message with 'vfprintf (stderr, FORMAT, ARGS)';
+   if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
+   If STATUS is nonzero, terminate the program with 'exit (STATUS)'.
+   If FNAME is not NULL, prepend the message with "FNAME:LINENO:".
+   Use the globals error_print_progname, error_message_count, and
+   error_one_per_line similarly to error_at_line().  */
+void
+verror_at_line (int status, int errnum, const char *file,
+                unsigned int line_number, const char *format, va_list args)
+{
+  char *message = xvasprintf (format, args);
+  if (message)
+    {
+      /* Until https://sourceware.org/bugzilla/show_bug.cgi?id=2997 is fixed,
+         glibc violates GNU Coding Standards when the file argument to
+         error_at_line is NULL.  */
+      if (file)
+        error_at_line (status, errnum, file, line_number, "%s", message);
+      else
+        error (status, errnum, "%s", message);
+    }
+  else
+    {
+      /* EOVERFLOW, EINVAL, and EILSEQ from xvasprintf are signs of
+         serious programmer errors.  */
+      error (0, errno, _("unable to display error message"));
+      abort ();
+    }
+  free (message);
+}