92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* Copyright 1993 - 1994, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID("$Id: rename.c,v 1.3 1997/12/07 23:26:57 marekm Exp $")
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#include "defines.h"
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#include <sys/stat.h>
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#include <errno.h>
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/*
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* rename - rename a file to another name
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*
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* rename is provided for systems which do not include the rename()
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* system call.
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*/
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int
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rename(const char *begin, const char *end)
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{
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struct stat s1, s2;
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extern int errno;
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int orig_err = errno;
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if (stat (begin, &s1))
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return -1;
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if (stat (end, &s2)) {
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errno = orig_err;
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} else {
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/*
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* See if this is a cross-device link. We do this to
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* insure that the link below has a chance of working.
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*/
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if (s1.st_dev != s2.st_dev) {
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errno = EXDEV;
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return -1;
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}
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/*
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* See if we can unlink the existing destination
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* file. If the unlink works the directory is writable,
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* so there is no need here to figure that out.
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*/
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if (unlink (end))
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return -1;
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}
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/*
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* Now just link the original name to the final name. If there
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* was no file previously, this link will fail if the target
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* directory isn't writable. The unlink will fail if the source
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* directory isn't writable, but life stinks ...
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*/
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if (link (begin, end) || unlink (begin))
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return -1;
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return 0;
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}
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