common_tools.c

// Copyright 2022 <Maros Varchola - mvarchdev>

#include "common_tools.h"

#include <errno.h>
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>

/// @brief Will return random integer based on min max definitions
/// @param min Minimum number that should return
/// @param max Maximum number that should return
/// @return Random number based on min max definition
unsigned int rand_gen(int min, int max) {
  return min + (rand() % ((max + 1) - min));
}

/// @brief Sleep for the requested number of milliseconds
/// @param msec how long it should block
/// @return Error code
int msleep(long msec) {
  struct timespec ts;
  int res;

  if (msec < 0) {
    errno = EINVAL;
    return -1;
  }

  ts.tv_sec = msec / 1000;
  ts.tv_nsec = (msec % 1000) * 1000000;

  do {
    res = nanosleep(&ts, &ts);
  } while (res && errno == EINTR);

  return res;
}

/// @brief Get actual time in ms
/// @return Actual time in miliseconds
long long timeInMilliseconds() {
  struct timeval tv;

  gettimeofday(&tv, NULL);
  return (((long long)tv.tv_sec) * 1000) + (tv.tv_usec / 1000);
}