apr_byte_t oidc_util_file_write(request_rec *r, const char *path,
		const char *data) {

	apr_file_t *fd = NULL;
	apr_status_t rc = APR_SUCCESS;
	apr_size_t bytes_written = 0;
	char s_err[128];

	/* try to open the metadata file for writing, creating it if it does not exist */
	if ((rc = apr_file_open(&fd, path,
			(APR_FOPEN_WRITE | APR_FOPEN_CREATE | APR_FOPEN_TRUNCATE),
			APR_OS_DEFAULT, r->pool)) != APR_SUCCESS) {
		oidc_error(r, "file \"%s\" could not be opened (%s)", path,
				apr_strerror(rc, s_err, sizeof(s_err)));
		return FALSE;
	}

	/* lock the file and move the write pointer to the start of it */
	apr_file_lock(fd, APR_FLOCK_EXCLUSIVE);
	apr_off_t begin = 0;
	apr_file_seek(fd, APR_SET, &begin);

	/* calculate the length of the data, which is a string length */
	apr_size_t len = strlen(data);

	/* (blocking) write the number of bytes in the buffer */
	rc = apr_file_write_full(fd, data, len, &bytes_written);

	/* check for a system error */
	if (rc != APR_SUCCESS) {
		oidc_error(r, "could not write to: \"%s\" (%s)", path,
				apr_strerror(rc, s_err, sizeof(s_err)));
		return FALSE;
	}

	/* check that all bytes from the header were written */
	if (bytes_written != len) {
		oidc_error(r,
				"could not write enough bytes to: \"%s\", bytes_written (%" APR_SIZE_T_FMT ") != len (%" APR_SIZE_T_FMT ")",
				path, bytes_written, len);
		return FALSE;
	}

	/* unlock and close the written file */
	apr_file_unlock(fd);
	apr_file_close(fd);

	oidc_debug(r, "file \"%s\" written; number of bytes (%" APR_SIZE_T_FMT ")",
			path, len);

	return TRUE;
}
apr_byte_t oidc_util_file_write(request_rec *r, const char *path,
		const char *data) {

	apr_file_t *fd = NULL;
	apr_status_t rc = APR_SUCCESS;
	apr_size_t bytes_written = 0;
	char s_err[128];

	 
	if ((rc = apr_file_open(&fd, path,
			(APR_FOPEN_WRITE | APR_FOPEN_CREATE | APR_FOPEN_TRUNCATE),
			APR_OS_DEFAULT, r->pool)) != APR_SUCCESS) {
		oidc_error(r, "file \"%s\" could not be opened (%s)", path,
				apr_strerror(rc, s_err, sizeof(s_err)));
		return FALSE;
	}

	 
	apr_file_lock(fd, APR_FLOCK_EXCLUSIVE);
	apr_off_t begin = 0;
	apr_file_seek(fd, APR_SET, &begin);

	 
	apr_size_t len = strlen(data);

	 
	rc = apr_file_write_full(fd, data, len, &bytes_written);

	 
	if (rc != APR_SUCCESS) {
		oidc_error(r, "could not write to: \"%s\" (%s)", path,
				apr_strerror(rc, s_err, sizeof(s_err)));
		return FALSE;
	}

	 
	if (bytes_written != len) {
		oidc_error(r,
				"could not write enough bytes to: \"%s\", bytes_written (%" APR_SIZE_T_FMT ") != len (%" APR_SIZE_T_FMT ")",
				path, bytes_written, len);
		return FALSE;
	}

	 
	apr_file_unlock(fd);
	apr_file_close(fd);

	oidc_debug(r, "file \"%s\" written; number of bytes (%" APR_SIZE_T_FMT ")",
			path, len);

	return TRUE;
}