src/core/errstat.c

/*
 * Copyright (C) 2026 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * 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 of the
 * License, 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );

#include <ipxe/errstat.h>

/** @file
 *
 * Error statistics
 *
 */

/**
 * Record error statistic
 *
 * @v stats		Error statistics
 * @v rc		Status code
 */
void record_stat ( struct error_statistics *stats, int rc ) {
	struct error_statistic *error;
	struct error_statistic *least_common_error;
	unsigned int i;

	/* If this is not an error, just update the good counter */
	if ( rc == 0 ) {
		stats->good++;
		return;
	}

	/* Update the bad counter */
	stats->bad++;

	/* Locate the appropriate error record */
	least_common_error = &stats->errors[0];
	for ( i = 0 ; i < ( sizeof ( stats->errors ) /
			    sizeof ( stats->errors[0] ) ) ; i++ ) {
		error = &stats->errors[i];
		/* Update matching record, if found */
		if ( error->rc == rc ) {
			error->count++;
			return;
		}
		if ( error->count < least_common_error->count )
			least_common_error = error;
	}

	/* Overwrite the least common error record */
	least_common_error->rc = rc;
	least_common_error->count = 1;
}