timelib.c

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/* -- Includes -- */
/* system libraries */
#include <stdio.h>
#include <sys/time.h>
/* project libraries */
#include "timelib.h"

/* -- Defines -- */

/* -- Functions -- */


int timelib_timer_set(struct timeval *tv)
{
    // Set time to now
    gettimeofday(tv, NULL);

    // Check error!!!

    return 0;
}

double timelib_timer_get(struct timeval tv)
{
    struct timeval tv_now;
    double time_elapsed;

    // Get current time
    gettimeofday(&tv_now, NULL);

    time_elapsed = (tv_now.tv_sec - tv.tv_sec) * 1000.0;        // sec to ms
    time_elapsed += (tv_now.tv_usec - tv.tv_usec) / 1000.0;     // us to ms

    // Check error!!!

    return time_elapsed;
}

double timelib_timer_reset(struct timeval *tv)
{
    struct timeval tv_now;
    double time_elapsed;

    // Get current time
    gettimeofday(&tv_now, NULL);

    time_elapsed = (tv_now.tv_sec - tv->tv_sec) * 1000.0;        // sec to ms
    time_elapsed += (tv_now.tv_usec - tv->tv_usec) / 1000.0;     // us to ms

    // Set current time to timeval
    *tv = tv_now;

    // Check error!!!

    return time_elapsed;
}


void timelib_timer_add_ms(struct timeval *tv, unsigned int ms)
{
    // Increase time
    tv->tv_usec = tv->tv_usec + (ms * 1000);
    // Normalize tv_usec if required
    if(tv->tv_usec >= 1000000)
    {
        tv->tv_sec++;
        tv->tv_usec -= 1000000;
    }
}


double timelib_timer_diff(struct timeval tv1, struct timeval tv2)
{
    double time_difference;

    time_difference = (tv2.tv_sec - tv1.tv_sec) * 1000.0;        // sec to ms
    time_difference += (tv2.tv_usec - tv1.tv_usec) / 1000.0;     // us to ms

    return time_difference;
}

double timelib_unix_timestamp()
{
    struct timeval tv_now;
    double time_now;

    // Get current time
    gettimeofday(&tv_now, NULL);

    time_now = (double)tv_now.tv_sec * 1000; // sec to ms
    time_now += (double)tv_now.tv_usec / 1000; // us to ms

    // Check error!!!

    return time_now;
}