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/* @(#)rename.c 1.5 03/10/05 Copyright 1998-2003 J. Schilling */
#ifndef lint
static char sccsid[] =
"@(#)rename.c 1.5 03/10/05 Copyright 1998-2003 J. Schilling";
#endif
/*
* rename() for old systems that don't have it.
*
* Copyright (c) 1998-2003 J. Schilling
*/
/*
* 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; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#define rename __nothing__
#include <mconfig.h>
#ifndef HAVE_RENAME
#include <stdio.h> /* XXX not OK but needed for js_xx() in schily.h */
#include <unixstd.h>
#include <strdefs.h>
#include <statdefs.h>
#include <maxpath.h>
#include <standard.h>
#include <utypes.h>
#include <schily.h>
#include <errno.h>
#undef rename
#include <libport.h>
#ifndef MAXPATHNAME
#define MAXPATHNAME 1024
#endif
#if MAXPATHNAME < 1024
#undef MAXPATHNAME
#define MAXPATHNAME 1024
#endif
#define MAXNAME MAXPATHNAME
#define FILEDESC struct stat
#ifndef HAVE_LSTAT
#define lstat stat
#endif
EXPORT int
rename(old, new)
const char *old;
const char *new;
{
char nname[MAXNAME];
char bakname[MAXNAME];
char strpid[32];
int strplen;
BOOL savpresent = FALSE;
BOOL newpresent = FALSE;
int serrno;
FILEDESC ostat;
FILEDESC xstat;
serrno = geterrno();
if (lstat(old, &ostat) < 0)
return (-1);
if (lstat(new, &xstat) >= 0) {
newpresent = TRUE;
if (ostat.st_dev == xstat.st_dev &&
ostat.st_ino == xstat.st_ino)
return (0); /* old == new we are done */
}
strplen = js_snprintf(strpid, sizeof (strpid), ".%lld",
(Llong)getpid());
if (strlen(new) <= (MAXNAME-strplen) ||
strchr(&new[MAXNAME-strplen], '/') == NULL) {
/*
* Save old version of file 'new'.
*/
strncpy(nname, new, MAXNAME-strplen);
nname[MAXNAME-strplen] = '\0';
js_snprintf(bakname, sizeof (bakname), "%s%s", nname, strpid);
unlink(bakname);
if (link(new, bakname) >= 0)
savpresent = TRUE;
}
if (newpresent) {
if (rmdir(new) < 0) {
if (geterrno() == ENOTDIR) {
if (unlink(new) < 0)
return (-1);
} else {
return (-1);
}
}
}
/*
* Now add 'new' name to 'old'.
*/
if (link(old, new) < 0) {
serrno = geterrno();
/*
* Make sure not to loose old version of 'new'.
*/
if (savpresent) {
unlink(new);
link(bakname, new);
unlink(bakname);
}
seterrno(serrno);
return (-1);
}
if (unlink(old) < 0)
return (-1);
unlink(bakname); /* Fails in most cases... */
seterrno(serrno); /* ...so restore errno */
return (0);
}
#endif /* HAVE_RENAME */
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