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-rw-r--r--src/lib/CMakeLists.txt1
-rw-r--r--src/lib/time_utils.c141
2 files changed, 142 insertions, 0 deletions
diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index ac9b93b1..796a0b7c 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -36,6 +36,7 @@ set(SOURCE_FILES
shm_ap_rbuff.c
shm_du_map.c
sockets.c
+ time_utils.c
utils.c
)
diff --git a/src/lib/time_utils.c b/src/lib/time_utils.c
new file mode 100644
index 00000000..2521f217
--- /dev/null
+++ b/src/lib/time_utils.c
@@ -0,0 +1,141 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Time utilities
+ *
+ * Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/time_utils.h>
+#include <stddef.h>
+
+/* functions for timespecs */
+
+/* add intv to t and store it in res*/
+int ts_add(const struct timespec * t,
+ const struct timespec * intv,
+ struct timespec * res)
+{
+ long nanos = 0;
+
+ if (t == NULL || intv == NULL || res == NULL)
+ return -1;
+
+ nanos = t->tv_nsec + intv->tv_nsec;
+
+ res->tv_sec = t->tv_sec + intv->tv_sec;
+ while (nanos > BILLION) {
+ nanos -= BILLION;
+ ++(res->tv_sec);
+ }
+ res->tv_nsec = nanos;
+
+ return 0;
+}
+
+/* subtract intv from t and stores it in res */
+int ts_diff(const struct timespec * t,
+ const struct timespec * intv,
+ struct timespec * res)
+{
+ long nanos = 0;
+
+ if (t == NULL || intv == NULL || res == NULL)
+ return -1;
+
+ nanos = t->tv_nsec - intv->tv_nsec;
+
+ res->tv_sec = t->tv_sec - intv->tv_sec;
+ while (nanos < 0) {
+ nanos += BILLION;
+ --(res->tv_sec);
+ }
+ res->tv_nsec = nanos;
+
+ return 0;
+}
+
+/* functions for timevals */
+
+/* add intv to t and store it in res*/
+int tv_add(const struct timeval * t,
+ const struct timeval * intv,
+ struct timeval * res)
+{
+ long micros = 0;
+
+ if (t == NULL || intv == NULL || res == NULL)
+ return -1;
+
+ micros = t->tv_usec + intv->tv_usec;
+
+ res->tv_sec = t->tv_sec + intv->tv_sec;
+ while (micros > MILLION) {
+ micros -= MILLION;
+ --(res->tv_sec);
+ }
+ res->tv_usec = micros;
+
+ return 0;
+}
+
+/* subtract intv from t and stores it in res */
+int tv_diff(const struct timeval * t,
+ const struct timeval * intv,
+ struct timeval * res)
+{
+ long micros = 0;
+
+ if (t == NULL || intv == NULL || res == NULL)
+ return -1;
+
+ micros = t->tv_usec - intv->tv_usec;
+
+ res->tv_sec = t->tv_sec - intv->tv_sec;
+ while (micros < 0) {
+ micros += MILLION;
+ --(res->tv_sec);
+ }
+ res->tv_usec = micros;
+
+ return 0;
+}
+
+int tv_to_ts(const struct timeval * src,
+ struct timespec * dst)
+{
+ if (src == NULL || dst == NULL)
+ return -1;
+
+ dst->tv_sec = src->tv_sec;
+ dst->tv_nsec = src->tv_usec * 1000L;
+
+ return 0;
+}
+
+/* copying a timespec into a timeval (loss of resolution) */
+int ts_to_tv(const struct timespec * src,
+ struct timeval * dst)
+{
+ if (src == NULL || dst == NULL)
+ return -1;
+
+ dst->tv_sec = src->tv_sec;
+ dst->tv_usec = src->tv_nsec / 1000L;
+
+ return 0;
+}