/*
 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
 * See the copyright notice in the ACK home directory, in the file "Copyright".
 */
/* $Header$ */

#include	<string.h>

char *
strerror(register int errnum)
{
	extern const char *_sys_errlist[];
	extern const int _sys_nerr;

  	if (errnum < 0 || errnum >= _sys_nerr)
		return "unknown error";
	return (char *)_sys_errlist[errnum];
}