Alternative rewrite for test_helpers.c:copy_file

gistfile1.txt

int copy_file(const char *src, const char *dst)
{
	git_buf source_buf = GIT_BUF_INIT;
	git_file dst_fd;
	int error = GIT_ERROR;

	if (git_futils_readbuffer(&source_buf, src) < GIT_SUCCESS)
		return GIT_ENOTFOUND;

	dst_fd = git_futils_creat_withpath(dst, 0777, 0666);
	if (dst_fd < 0)
		error = dst_fd;
	else
		error = p_write(dst_fd, source_buf.ptr, source_buf.size);

	git_buf_free(&source_buf);

	if (dst_fd >= 0)
		p_close(dst_fd);

	return error;
}