120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/* Copying of files.
|
|
Copyright (C) 2001-2003 Free Software Foundation, Inc.
|
|
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
|
|
|
|
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; if not, write to the Free Software Foundation,
|
|
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
/* Specification. */
|
|
#include "copy-file.h"
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stddef.h>
|
|
#include <sys/stat.h>
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
# include <unistd.h>
|
|
#endif
|
|
|
|
#if HAVE_UTIME || HAVE_UTIMES
|
|
# if HAVE_UTIME_H
|
|
# include <utime.h>
|
|
# else
|
|
# include <sys/utime.h>
|
|
# endif
|
|
#endif
|
|
|
|
#include "error.h"
|
|
#include "safe-read.h"
|
|
#include "full-write.h"
|
|
#include "binary-io.h"
|
|
#include "exit.h"
|
|
#include "gettext.h"
|
|
|
|
#define _(str) gettext (str)
|
|
|
|
void
|
|
copy_file_preserving (const char *src_filename, const char *dest_filename)
|
|
{
|
|
int src_fd;
|
|
struct stat statbuf;
|
|
int mode;
|
|
int dest_fd;
|
|
char buf[4096];
|
|
const size_t buf_size = sizeof (buf);
|
|
|
|
src_fd = open (src_filename, O_RDONLY | O_BINARY);
|
|
if (src_fd < 0 || fstat (src_fd, &statbuf) < 0)
|
|
error (EXIT_FAILURE, errno, _("error while opening \"%s\" for reading"),
|
|
src_filename);
|
|
|
|
mode = statbuf.st_mode & 07777;
|
|
|
|
dest_fd = open (dest_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0600);
|
|
if (dest_fd < 0)
|
|
error (EXIT_FAILURE, errno, _("cannot open backup file \"%s\" for writing"),
|
|
dest_filename);
|
|
|
|
/* Copy the file contents. */
|
|
for (;;)
|
|
{
|
|
size_t n_read = safe_read (src_fd, buf, buf_size);
|
|
if (n_read == SAFE_READ_ERROR)
|
|
error (EXIT_FAILURE, errno, _("error reading \"%s\""), src_filename);
|
|
if (n_read == 0)
|
|
break;
|
|
|
|
if (full_write (dest_fd, buf, n_read) < n_read)
|
|
error (EXIT_FAILURE, errno, _("error writing \"%s\""), dest_filename);
|
|
}
|
|
|
|
if (close (dest_fd) < 0)
|
|
error (EXIT_FAILURE, errno, _("error writing \"%s\""), dest_filename);
|
|
if (close (src_fd) < 0)
|
|
error (EXIT_FAILURE, errno, _("error after reading \"%s\""), src_filename);
|
|
|
|
/* Preserve the access and modification times. */
|
|
#if HAVE_UTIME
|
|
{
|
|
struct utimbuf ut;
|
|
|
|
ut.actime = statbuf.st_atime;
|
|
ut.modtime = statbuf.st_mtime;
|
|
utime (dest_filename, &ut);
|
|
}
|
|
#elif HAVE_UTIMES
|
|
{
|
|
struct timeval ut[2];
|
|
|
|
ut[0].tv_sec = statbuf.st_atime; ut[0].tv_usec = 0;
|
|
ut[1].tv_sec = statbuf.st_mtime; ut[1].tv_usec = 0;
|
|
utimes (dest_filename, &ut);
|
|
}
|
|
#endif
|
|
|
|
#if HAVE_CHOWN
|
|
/* Preserve the owner and group. */
|
|
chown (dest_filename, statbuf.st_uid, statbuf.st_gid);
|
|
#endif
|
|
|
|
/* Preserve the access permissions. */
|
|
chmod (dest_filename, mode);
|
|
}
|