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/*
* 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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