1 files changed, 89 insertions, 0 deletions
diff --git a/lib/long-options.c b/lib/long-options.c
new file mode 100644
index 0000000..fb61661
--- /dev/null
+++ b/lib/long-options.c
@@ -0,0 +1,89 @@
+/* Utility to accept --help and --version options as unobtrusively as possible.
+
+   Copyright (C) 1993, 1994, 1998, 1999, 2000, 2002, 2003, 2004, 2005,
+   2006 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 2, 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Jim Meyering.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "long-options.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include "version-etc.h"
+
+static struct option const long_options[] =
+{
+  {"help", no_argument, NULL, 'h'},
+  {"version", no_argument, NULL, 'v'},
+  {NULL, 0, NULL, 0}
+};
+
+/* Process long options --help and --version, but only if argc == 2.
+   Be careful not to gobble up `--'.  */
+
+void
+parse_long_options (int argc,
+		    char **argv,
+		    const char *command_name,
+		    const char *package,
+		    const char *version,
+		    void (*usage_func) (int),
+		    /* const char *author1, ...*/ ...)
+{
+  int c;
+  int saved_opterr;
+
+  saved_opterr = opterr;
+
+  /* Don't print an error message for unrecognized options.  */
+  opterr = 0;
+
+  if (argc == 2
+      && (c = getopt_long (argc, argv, "+", long_options, NULL)) != -1)
+    {
+      switch (c)
+	{
+	case 'h':
+	  (*usage_func) (EXIT_SUCCESS);
+
+	case 'v':
+	  {
+	    va_list authors;
+	    va_start (authors, usage_func);
+	    version_etc_va (stdout, command_name, package, version, authors);
+	    exit (0);
+	  }
+
+	default:
+	  /* Don't process any other long-named options.  */
+	  break;
+	}
+    }
+
+  /* Restore previous value.  */
+  opterr = saved_opterr;
+
+  /* Reset this to zero so that getopt internals get initialized from
+     the probably-new parameters when/if getopt is called later.  */
+  optind = 0;
+}