Rename 'statistics.c' to 'counter.c'
With stat_item, stats.c and stats_statsd.c, it is becoming a bit
difficult to understand file naming. Also, the 'statistics.c' file
actually only contained osmo_counter handling, so let's rename it to
counter.c altogether.
Change-Id: I2cfb2310543902b7da46cb15a76e2da317eaed7d
diff --git a/src/counter.c b/src/counter.c
new file mode 100644
index 0000000..6fa87ba
--- /dev/null
+++ b/src/counter.c
@@ -0,0 +1,85 @@
+/*! \file counter.c
+ * utility routines for keeping some statistics. */
+/*
+ * (C) 2009 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * 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.
+ *
+ */
+
+#include <string.h>
+
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/talloc.h>
+#include <osmocom/core/counter.h>
+
+static LLIST_HEAD(counters);
+
+void *tall_ctr_ctx;
+
+struct osmo_counter *osmo_counter_alloc(const char *name)
+{
+ struct osmo_counter *ctr = talloc_zero(tall_ctr_ctx, struct osmo_counter);
+
+ if (!ctr)
+ return NULL;
+
+ ctr->name = name;
+ llist_add_tail(&ctr->list, &counters);
+
+ return ctr;
+}
+
+void osmo_counter_free(struct osmo_counter *ctr)
+{
+ llist_del(&ctr->list);
+ talloc_free(ctr);
+}
+
+int osmo_counters_for_each(int (*handle_counter)(struct osmo_counter *, void *),
+ void *data)
+{
+ struct osmo_counter *ctr;
+ int rc = 0;
+
+ llist_for_each_entry(ctr, &counters, list) {
+ rc = handle_counter(ctr, data);
+ if (rc < 0)
+ return rc;
+ }
+
+ return rc;
+}
+
+struct osmo_counter *osmo_counter_get_by_name(const char *name)
+{
+ struct osmo_counter *ctr;
+
+ llist_for_each_entry(ctr, &counters, list) {
+ if (!strcmp(ctr->name, name))
+ return ctr;
+ }
+ return NULL;
+}
+
+int osmo_counter_difference(struct osmo_counter *ctr)
+{
+ int delta = ctr->value - ctr->previous;
+ ctr->previous = ctr->value;
+
+ return delta;
+}