/*
 *      dnsutl - utilities to make DNS easier to configure
 *      Copyright (C) 1991-1995, 1999, 2006, 2007 Peter Miller
 *
 *      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 <ac/unistd.h>

#include <arglex.h>
#include <error.h>
#include <help.h>


void
help(const char *name, void (*usage)(void))
{
    const char      *argv[3];

    /*
     * collect the rest of the command line,
     * if necessary
     */
    if (usage)
    {
        arglex();
        if (arglex_token != arglex_token_eoln)
            usage();
    }
    if (!name)
        name = progname;

    /*
     * Invoke the appropriate man(1) command.  This will find the
     * right language on the search path, and it already knows how
     * to translate the *roff into text.
     */
    argv[0] = "man";
    argv[1] = progname;
    argv[2] = 0;
    error("%s %s", argv[0], argv[1]);
    execvp(argv[0], (char *const *)argv);
    nfatal("exec %s", argv[0]);
    /* NOTREACHED */
}