/*
 *      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/>.
 *
 *      This file contains functions for use with non-ANSI conforming systems
 *      to implement absent ANSI functionality.
 */

#include <stdio.h>
#include <ac/stddef.h>
#include <ac/stdlib.h>
#include <ac/string.h>

#include <main.h>


/*
 *  NAME
 *      strerror - string for error number
 *
 *  SYNOPSIS
 *      char *strerror(int errnum);
 *
 *  DESCRIPTION
 *      The strerror function maps the error number in errnum to an error
 *      message string.
 *
 *  RETURNS
 *      The strerror function returns a pointer to the string, the contents of
 *      which are implementation-defined.  The array pointed to shall not be
 *      modified by the program, but may be overwritten by a subsequent call to
 *      the strerror function.
 *
 *  CAVEAT
 *      Unknown errors will be rendered in the form "Error %d", where %d will
 *      be replaced by a decimal representation of the error number.
 */

#ifndef HAVE_STRERROR

char *
strerror(int n)
{
    extern int      sys_nerr;
    extern char     *sys_errlist[];
    static char     buffer[16];

    if (n < 1 || n > sys_nerr)
    {
        sprintf(buffer, "Error %d", n);
        return buffer;
    }
    return sys_errlist[n];
}

#endif /* !HAVE_STRERROR */