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/* Copy a file from one path to another.
Copyright (C) 2020-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xunistd.h>
void
support_copy_file (const char *from, const char *to)
{
struct stat st;
xstat (from, &st);
int fd_from = xopen (from, O_RDONLY, 0);
mode_t mode = st.st_mode & 0777;
int fd_to = xopen (to, O_WRONLY | O_TRUNC | O_CREAT, mode);
ssize_t ret = support_copy_file_range (fd_from, NULL, fd_to, NULL,
st.st_size, 0);
if (ret < 0)
FAIL_EXIT1 ("copying from \"%s\" to \"%s\": %m", from, to);
if (ret != st.st_size)
FAIL_EXIT1 ("copying from \"%s\" to \"%s\": only %zd of %llu bytes copied",
from, to, ret, (unsigned long long int) st.st_size);
if (fchmod (fd_to, mode) < 0)
FAIL_EXIT1 ("fchmod on %s to 0%o: %m", to, mode);
xclose (fd_to);
xclose (fd_from);
}
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