#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#define FILENAME "flashpolicyd.log"
#define BACKUPNAME "fplogbackup"

void backupFile(unsigned);
unsigned checkTime(void);

int main(void) {
  unsigned currentTime = checkTime();
  unsigned newTime = currentTime;
  FILE * fileHandle;
  while (1) {
    newTime = checkTime();
    if (newTime != currentTime) {
      backupFile(currentTime);
      currentTime = newTime;
      fileHandle = fopen(FILENAME, "w");
      if (fileHandle) fclose(fileHandle);
    }
    sleep(900);
  }
  return 0;
}

unsigned checkTime (void) {
  struct tm timeData;
  timeData = *gmtime(time(NULL));
  unsigned timeValue;
  timeValue = timeData.tm_year * 100000 + timeData.tm_mon * 1000 + timeData.tm_mday * 10 + (timeData.tm_hour >> 3);
  return timeValue;
}

void backupFile (unsigned timestamp) {
  FILE * f1, f2;
  f1 = fopen(FILENAME, "r");
  char * newname = malloc(200);
  strcpy(newname, BACKUPNAME);
  char * number = malloc(200);
  sprintf(number, "%u", timestamp);
  strcat(newname, number);
  f2 = fopen(newname, "w");
  if (f1 && f2) {
    int newchar;
    while ((newchar = getc(f1)) != EOF) putc(newchar, f2);
  }
  if (f1) fclose(f1);
  if (f2) fclose(f2);
  free(newname);
  free(number);
}