Move a couple of time-related modules into wsutil.

A bunch of files didn't really need to include these header files so remove
the include line rather than changing it.

svn path=/trunk/; revision=50154

1 files changed, 202 insertions, 0 deletions

diff --git a/wsutil/nstime.c b/wsutil/nstime.c
new file mode 100644
index 0000000000..e88818856a
--- /dev/null
+++ b/wsutil/nstime.c
@@ -0,0 +1,202 @@
+/* nstime.c
+ * Routines for manipulating nstime_t structures
+ *
+ * Copyright (c) 2005 MX Telecom Ltd. <richardv@mxtelecom.com>
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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 <glib.h>
+#include "nstime.h"
+
+/* this is #defined so that we can clearly see that we have the right number of
+   zeros, rather than as a guard against the number of nanoseconds in a second
+   changing ;) */
+#define NS_PER_S 1000000000
+
+/* set the given nstime_t to zero */
+void nstime_set_zero(nstime_t *nstime)
+{
+    nstime->secs  = 0;
+    nstime->nsecs = 0;
+}
+
+/* is the given nstime_t currently zero? */
+gboolean nstime_is_zero(nstime_t *nstime)
+{
+    if(nstime->secs == 0 && nstime->nsecs == 0) {
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+/* set the given nstime_t to (0,maxint) to mark it as "unset"
+ * That way we can find the first frame even when a timestamp
+ * is zero (fix for bug 1056)
+ */
+void nstime_set_unset(nstime_t *nstime)
+{
+    nstime->secs  = 0;
+    nstime->nsecs = G_MAXINT;
+}
+
+/* is the given nstime_t currently (0,maxint)? */
+gboolean nstime_is_unset(nstime_t *nstime)
+{
+    if(nstime->secs == 0 && nstime->nsecs == G_MAXINT) {
+        return TRUE;
+    } else {
+        return FALSE;
+    }
+}
+
+
+/** funcion: nstime_copy
+ *
+ * a = b
+ */
+void nstime_copy(nstime_t *a, const nstime_t *b)
+{
+    a->secs = b->secs;
+    a->nsecs = b->nsecs;
+}
+
+/*
+ * function: nstime_delta
+ * delta = b - a
+ */
+
+void nstime_delta(nstime_t *delta, const nstime_t *b, const nstime_t *a )
+{
+    if (b->secs == a->secs) {
+        /* The seconds part of b is the same as the seconds part of a, so if
+           the nanoseconds part of the first time is less than the nanoseconds
+           part of a, b is before a.  The nanoseconds part of the delta should
+           just be the difference between the nanoseconds part of b and the
+           nanoseconds part of a; don't adjust the seconds part of the delta,
+           as it's OK if the nanoseconds part is negative, and an overflow
+           can never result. */
+        delta->secs = 0;
+        delta->nsecs = b->nsecs - a->nsecs;
+    } else if (b->secs <= a->secs) {
+        /* The seconds part of b is less than the seconds part of a, so b is
+           before a.
+
+           Both the "seconds" and "nanoseconds" value of the delta
+           should have the same sign, so if the difference between the
+           nanoseconds values would be *positive*, subtract 1,000,000,000
+           from it, and add one to the seconds value. */
+        delta->secs = b->secs - a->secs;
+        delta->nsecs = b->nsecs - a->nsecs;
+        if(delta->nsecs > 0) {
+            delta->nsecs -= NS_PER_S;
+            delta->secs ++;
+        }
+    } else {
+        delta->secs = b->secs - a->secs;
+        delta->nsecs = b->nsecs - a->nsecs;
+        if(delta->nsecs < 0) {
+            delta->nsecs += NS_PER_S;
+            delta->secs --;
+        }
+    }
+}
+
+/*
+ * function: nstime_sum
+ * sum = a + b
+ */
+
+void nstime_sum(nstime_t *sum, const nstime_t *a, const nstime_t *b)
+{
+    sum->secs = a->secs + b->secs;
+    sum->nsecs = a->nsecs + b->nsecs;
+    if(sum->nsecs>=NS_PER_S || (sum->nsecs>0 && sum->secs<0)){
+        sum->nsecs-=NS_PER_S;
+        sum->secs++;
+    } else if(sum->nsecs<=-NS_PER_S || (sum->nsecs<0 && sum->secs>0)) {
+        sum->nsecs+=NS_PER_S;
+        sum->secs--;
+    }
+}
+
+/*
+ * function: nstime_cmp
+ *
+ * a > b : > 0
+ * a = b : 0
+ * a < b : < 0
+ */
+
+int nstime_cmp (const nstime_t *a, const nstime_t *b )
+{
+    if (a->secs == b->secs) {
+        return a->nsecs - b->nsecs;
+    } else {
+        return (int) (a->secs - b->secs);
+    }
+}
+
+/*
+ * function: nstime_to_msec
+ * converts nstime to double, time base is milli seconds
+ */
+
+double nstime_to_msec(const nstime_t *nstime)
+{
+    return ((double)nstime->secs*1000 + (double)nstime->nsecs/1000000);
+}
+
+/*
+ * function: nstime_to_sec
+ * converts nstime to double, time base is seconds
+ */
+
+double nstime_to_sec(const nstime_t *nstime)
+{
+    return ((double)nstime->secs + (double)nstime->nsecs/1000000000);
+}
+
+/*
+ * function: wtap_nstime_to_sec
+ * converts wtap_nstime to double, time base is seconds
+ */
+
+double wtap_nstime_to_sec(const struct wtap_nstime *nstime)
+{
+    return ((double)nstime->secs + (double)nstime->nsecs/1000000000);
+}
+
+/*
+ * Editor modelines
+ *
+ * Local Variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
+