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/* rename.c -- rename a file, preserving symlinks.
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This file is part of GNU Binutils.
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 3 of the License, 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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "bucomm.h"
#ifdef HAVE_GOOD_UTIME_H
#include <utime.h>
#else /* ! HAVE_GOOD_UTIME_H */
#ifdef HAVE_UTIMES
#include <sys/time.h>
#endif /* HAVE_UTIMES */
#endif /* ! HAVE_GOOD_UTIME_H */
#if ! defined (_WIN32) || defined (__CYGWIN32__)
static int simple_copy (const char *, const char *);
/* The number of bytes to copy at once. */
#define COPY_BUF 8192
/* Copy file FROM to file TO, performing no translations.
Return 0 if ok, -1 if error. */
static int
simple_copy (const char *from, const char *to)
{
int fromfd, tofd, nread;
int saved;
char buf[COPY_BUF];
fromfd = open (from, O_RDONLY | O_BINARY);
if (fromfd < 0)
return -1;
#ifdef O_CREAT
tofd = open (to, O_CREAT | O_WRONLY | O_TRUNC | O_BINARY, 0777);
#else
tofd = creat (to, 0777);
#endif
if (tofd < 0)
{
saved = errno;
close (fromfd);
errno = saved;
return -1;
}
while ((nread = read (fromfd, buf, sizeof buf)) > 0)
{
if (write (tofd, buf, nread) != nread)
{
saved = errno;
close (fromfd);
close (tofd);
errno = saved;
return -1;
}
}
saved = errno;
close (fromfd);
close (tofd);
if (nread < 0)
{
errno = saved;
return -1;
}
return 0;
}
#endif /* __CYGWIN32__ or not _WIN32 */
/* Set the times of the file DESTINATION to be the same as those in
STATBUF. */
void
set_times (const char *destination, const struct stat *statbuf)
{
int result;
{
#ifdef HAVE_GOOD_UTIME_H
struct utimbuf tb;
tb.actime = statbuf->st_atime;
tb.modtime = statbuf->st_mtime;
result = utime (destination, &tb);
#else /* ! HAVE_GOOD_UTIME_H */
#ifndef HAVE_UTIMES
long tb[2];
tb[0] = statbuf->st_atime;
tb[1] = statbuf->st_mtime;
result = utime (destination, tb);
#else /* HAVE_UTIMES */
struct timeval tv[2];
tv[0].tv_sec = statbuf->st_atime;
tv[0].tv_usec = 0;
tv[1].tv_sec = statbuf->st_mtime;
tv[1].tv_usec = 0;
result = utimes (destination, tv);
#endif /* HAVE_UTIMES */
#endif /* ! HAVE_GOOD_UTIME_H */
}
if (result != 0)
non_fatal (_("%s: cannot set time: %s"), destination, strerror (errno));
}
/* Rename FROM to TO, copying if TO exists. TARGET_STAT has the file status
that, if non-NULL, is used to fix up timestamps after rename. Return 0 if
ok, -1 if error. */
int
smart_rename (const char *from, const char *to,
struct stat *target_stat ATTRIBUTE_UNUSED)
{
int ret = 0;
struct stat to_stat;
bfd_boolean exists;
exists = lstat (to, &to_stat) == 0;
#if defined (_WIN32) && !defined (__CYGWIN32__)
/* Win32, unlike unix, will not erase `to' in `rename(from, to)' but
fail instead. Also, chown is not present. */
if (exists)
remove (to);
ret = rename (from, to);
if (ret != 0)
{
/* We have to clean up here. */
non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno));
unlink (from);
}
#else
/* Avoid a full copy and use rename if TO does not exist. */
if (!exists)
{
if ((ret = rename (from, to)) != 0)
{
/* We have to clean up here. */
non_fatal (_("unable to rename '%s'; reason: %s"), to, strerror (errno));
unlink (from);
}
}
else
{
ret = simple_copy (from, to);
if (ret != 0)
non_fatal (_("unable to copy file '%s'; reason: %s"), to, strerror (errno));
if (target_stat != NULL)
set_times (to, target_stat);
unlink (from);
}
#endif /* _WIN32 && !__CYGWIN32__ */
return ret;
}
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