Function log_append

kernel/generic/src/log/log.c:119–144

Append data to the currently open log entry. * * This function requires that the log_lock is acquired by the caller. */

 * This function requires that the log_lock is acquired by the caller.
 */
static void log_append(const uint8_t *data, size_t len)
{
	/* Cap the length so that the entry entirely fits into the buffer */
	if (len > LOG_LENGTH - log_current_len) {
		len = LOG_LENGTH - log_current_len;
	}

	if (len == 0)
		return;

	size_t log_free = LOG_LENGTH - log_used - log_current_len;

	/* Discard older entries to make space, if necessary */
	while (len > log_free) {
		size_t entry_len;
		log_copy_from((uint8_t *) &entry_len, log_start, sizeof(size_t));
		log_start = (log_start + entry_len) % LOG_LENGTH;
		log_used -= entry_len;
		log_free += entry_len;
		next_for_uspace -= entry_len;
	}

	size_t pos = (log_current_start + log_current_len) % LOG_LENGTH;
	log_copy_to(data, pos, len);
	log_current_len += len;
}

/** Begin writing an entry to the log.
 *