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/* Copying of files.
Copyright (C) 2001 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 <sys/stat.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_UTIME || HAVE_UTIMES
# include <utime.h>
#endif
#include "error.h"
#include "full-write.h"
#include "binary-io.h"
#include "exit.h"
#include "gettext.h"
#define _(str) gettext (str)
void
copy_file (src_filename, dest_filename)
const char *src_filename;
const char *dest_filename;
{
int src_fd;
struct stat statbuf;
int mode;
int dest_fd;
char buf[4096];
const int 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 (;;)
{
ssize_t n_read = read (src_fd, buf, buf_size);
if (n_read < 0)
{
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
error (EXIT_FAILURE, errno, _("error reading \"%s\""), src_filename);
}
if (n_read == 0)
break;
if (full_write (dest_fd, buf, n_read) < 0)
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
/* Preserve the access permissions. */
chmod (dest_filename, mode);
}
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