/*
 * Libraries and headers for PDC release 3.3 (C) 1989 Lionel Hummel.
 * PDC Software Distribution (C) 1989 Lionel Hummel and Paul Petersen.
 * PDC I/O Library (C) 1987 by J.A. Lydiatt.
 *
 * This code is freely redistributable upon the conditions that this 
 * notice remains intact and that modified versions of this file not
 * be included as part of the PDC Software Distribution without the
 * express consent of the copyright holders.  No warrantee of any
 * kind is provided with this code.  For further information, contact:
 *
 *  PDC Software Distribution    Internet:                     BIX:
 *  P.O. Box 4006             or hummel@cs.uiuc.edu            lhummel
 *  Urbana, IL  61801-8801       petersen@uicsrd.csrd.uiuc.edu
 */

/* rename - renames an existing file */

#include	<errno.h>
#include	<libraries/dos.h>
#include	<functions.h>

int
rename(old, new)
char *old, *new;
{
    struct FileLock *lock;

    if ( lock = Lock(new, ACCESS_READ) ) {
        UnLock( lock);
        errno = EEXIST;
        return -1;
    }

    if ( !Rename(old, new) ) {
        errno = IoErr();
        return -1;
    }

    return 0;
}