timex.c
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/**
* Timex implementation
*
* Copyright (C) 2009, 2010, 2013, 2014 Freie Universitaet Berlin (FUB).
* Copyright (C) 2013, 2014 INRIA.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @file
* @author Kaspar Schleiser <kaspar@schleiser.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
* @author Christian Mehlis <mehlis@inf.fu-berlin.de>
* @author Daniel Jentsch <d.jentsch@fu-berlin.de>
*
*/
#include <stdio.h>
#include <inttypes.h>
#define ENABLE_DEBUG (0)
#include "debug.h"
#include "timex.h"
timex_t timex_add(const timex_t a, const timex_t b)
{
#if ENABLE_DEBUG
if (!timex_isnormalized(&a) || !timex_isnormalized(&b)) {
puts("timex_add on denormalized value");
}
#endif
timex_t result;
result.seconds = a.seconds + b.seconds;
result.microseconds = a.microseconds + b.microseconds;
if (result.microseconds > US_PER_SEC) {
result.microseconds -= US_PER_SEC;
result.seconds++;
}
return result;
}
timex_t timex_set(uint32_t seconds, uint32_t microseconds)
{
timex_t result;
result.seconds = seconds;
result.microseconds = microseconds;
#if ENABLE_DEBUG
if (!timex_isnormalized(&result)) {
puts("timex_set on denormalized value");
}
#endif
return result;
}
timex_t timex_sub(const timex_t a, const timex_t b)
{
#if ENABLE_DEBUG
if (!timex_isnormalized(&a) || !timex_isnormalized(&b)) {
puts("timex_sub on denormalized value");
}
#endif
timex_t result;
if (a.microseconds >= b.microseconds) {
result.seconds = a.seconds - b.seconds;
result.microseconds = a.microseconds - b.microseconds;
}
else {
result.seconds = a.seconds - b.seconds - 1;
result.microseconds = a.microseconds + US_PER_SEC - b.microseconds;
}
return result;
}
int timex_cmp(const timex_t a, const timex_t b)
{
#if ENABLE_DEBUG
if (!timex_isnormalized(&a) || !timex_isnormalized(&b)) {
puts("timex_cmp on denormalized value");
}
#endif
if (a.seconds < b.seconds) {
return -1;
}
if (a.seconds == b.seconds) {
if (a.microseconds < b.microseconds) {
return -1;
}
if (a.microseconds == b.microseconds) {
return 0;
}
}
return 1;
}