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/*
* Copyright (c) 1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND CARNEGIE MELLON UNIVERSITY
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT
* SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Users of this software agree to return to Carnegie Mellon any
* improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* Export of this software is permitted only after complying with the
* regulations of the U.S. Deptartment of Commerce relating to the
* Export of Technical Data.
*/
/* movefile -- change name of file
*
* Usage: int movefile (oldname,newname);
* char *oldname,*newname;
*
* Movefile attempts to change the name of a file.
* It tries to perform link and unlink, since this is
* the fastest way to rename a file. However, this
* will fail in certain circumstances (e.g. if the old and
* new names specify different mounted devices). So, if
* the link/unlink fails, movefile will perform opens
* and make a fast copy of the file using filecopy.
*
* If movefile is successful, the original file will be
* unlinked (removed), and the new file will have the
* same mode as the original. Movefile will return a 0.
* If unsuccessful, the original file will remain, but
* any file with the same name as the desired file will
* be deleted.
* Movefile will return -1 if unsuccessful.
*
* Movefile is useful for any program which creates a temporary
* file, then wishes to overwrite (or create) another file
* using that temp file.
*
* HISTORY
* $Log: movefile.c,v $
* Revision 1.2 90/12/11 17:57:02 mja
* Add copyright/disclaimer for distribution.
*
* 03-Jun-85 Steven Shafer (sas) at Carnegie-Mellon University
* Changed for 4.2 BSD UNIX to use new rename() and open() calls.
* Name changed from "rename" to "movefile" to avoid conflict with
* new rename() system call.
*
* 18-Feb-83 Steven Shafer (sas) at Carnegie-Mellon University
* Fixed bug in call to "link" which prevented it from ever working.
*
* 10-Dec-79 Steven Shafer (sas) at Carnegie-Mellon University
* Created.
*
*/
#include "sys/types.h"
#include "sys/stat.h"
#include "sys/file.h"
int movefile (from,to)
char *from, *to;
{
register int f,t; /* file descriptors */
register int x; /* system call status */
struct stat statbuf; /* for old file mode */
if (rename(from,to) >= 0) { /* link successful */
return (0);
}
x = stat (from,&statbuf); /* we need the old file mode */
if (x<0) return (-1);
f = open (from,0); /* read original */
if (f<0) return (-1);
t = open (to,(O_WRONLY|O_CREAT|O_TRUNC),statbuf.st_mode & 07777); /* create dest. file */
if (t<0) {close(f); return (-1);}
x = filecopy (f,t); /* fast file copy */
close (f);
close (t);
if (x >= 0) unlink (from);
return (x);
}
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