From 46f96ed5e3127394a0cd4dcb961404b792f743b4 Mon Sep 17 00:00:00 2001
From: Jakub Slawinski
Date: Thu, 10 Jul 2014 10:24:59 +0200
Subject: Initial project structure based on Active Port Forwarder 0.8.4.

---
 src/timeval_functions.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 src/timeval_functions.c

(limited to 'src/timeval_functions.c')

diff --git a/src/timeval_functions.c b/src/timeval_functions.c
new file mode 100644
index 0000000..122e03a
--- /dev/null
+++ b/src/timeval_functions.c
@@ -0,0 +1,134 @@
+/*
+ * active port forwarder - software for secure forwarding
+ * Copyright (C) 2003-2007 jeremian <jeremian [at] poczta.fm>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <assert.h>
+
+#include "timeval_functions.h"
+
+/*
+ * Function name: timeval_create
+ * Description: Initialize and return timeval structure.
+ * Arguments: tv_sec - seconds
+ *            tv_usec - microseconds
+ * Returns: Initialized timeval structure.
+ */
+
+struct timeval
+timeval_create(long tv_sec, long tv_usec)
+{
+  struct timeval tmp;
+  tmp.tv_sec = tv_sec;
+  tmp.tv_usec = tv_usec;
+  return tmp;
+}
+
+/*
+ * Function name: timeval_compare
+ * Description: Compares two pointers to timeval structures.
+ * Arguments: first - the first timeval structure to compare
+ *            second - the second timeval structure to compare
+ * Returns: -1 - the second structure is bigger
+ *           0 - structures are equals
+ *           1 - the first structure is bigger
+ */
+
+int
+timeval_compare(struct timeval* first, struct timeval* second)
+{
+  if (first == NULL) {
+    if (second == NULL) {
+      return 0;
+    }
+    else {
+      return -1;
+    }
+  }
+  if (second == NULL) {
+    return 1;
+  }
+  if (first->tv_sec < second->tv_sec) {
+    return -1;
+  }
+  if (first->tv_sec > second->tv_sec) {
+    return 1;
+  }
+  if (first->tv_usec < second->tv_usec) {
+    return -1;
+  }
+  if (first->tv_usec > second->tv_usec) {
+    return 1;
+  }
+  return 0;
+}
+
+/*
+ * Function name: timeval_subtract
+ * Description: Substracts second timeval structure from the first, updating the latter one.
+ * Arguments: first - the first timeval structure to subtract operation
+ *            second - the second timeval structure to subtract operation
+ * Returns: 0 - success,
+ *          1 - failure.
+ */
+
+int
+timeval_subtract(struct timeval* first, struct timeval* second)
+{
+  assert(first != NULL);
+  assert(second != NULL);
+  if ((first == NULL) || (second == NULL)) {
+    return 1;
+  }
+  if (first->tv_usec < second->tv_usec) {
+    first->tv_sec -= 1;
+    first->tv_usec = 1000000 - second->tv_usec + first->tv_usec;
+  }
+  else {
+    first->tv_usec -= second->tv_usec;
+  }
+  first->tv_sec -= second->tv_sec;
+  return 0;
+}
+
+/*
+ * Function name: timeval_lq_zero
+ * Description: Checks if the timer is less or equiv zero.
+ * Arguments: timer - the timeval structure to check
+ * Returns: 1 - the timer is less or equiv zero,
+ *          0 - the timer is bigger than zero.
+ */
+
+int
+timeval_lq_zero(struct timeval* timer)
+{
+  assert(timer != NULL);
+  if (timer == NULL) {
+    return 0;
+  }
+  if (timer->tv_sec < 0) {
+    return 1;
+  }
+  if ((timer->tv_sec == 0) && (timer->tv_usec == 0)) {
+    return 1;
+  }
+  return 0;
+}
-- 
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