/* nstime.c * Routines for manipulating nstime_t structures * * Copyright (c) 2005 MX Telecom Ltd. <richardv@mxtelecom.com> * * $Id: nstime.c 25538 2008-06-23 20:04:31Z stig $ * * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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; } } /* * 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 (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: */

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