#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>
#include <semaphore.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>



#define osAssert(cond, msg) osErrorFatal(cond, msg, __FILE__, __LINE__)

void osErrorFatal(bool cond, const char* msg, const char* file, int line)
{
  if(!cond)
  {
    perror(msg);
    fprintf(stderr,"%s:%d\n", file,line);
    exit(EXIT_FAILURE);
  }
}

int main(int argc, char** argv)
{
  osAssert(argc > 1 , "wrong number of args");

  int nFiles = argc-1;
  const char* cmd = "du\0";
  const char* arg1 = "-sch\0";

  for(int i = 0; i < nFiles; i++)
  {
    int pipeFds[2];
    osAssert(-1 != pipe(pipeFds), "pipe failed");

    const char* arg2 = argv[i+1];


    pid_t childPid = fork();

    if(childPid == 0)
    {
      close(pipeFds[0]);
      osAssert(-1 != dup2(pipeFds[1], STDOUT_FILENO), "dup2 failed");
      osAssert(-1 != execlp(cmd,cmd,arg1,arg2,NULL), "exec failed");
    }
    else
    {
      close(pipeFds[1]);

      int wstatus;
      osAssert(-1 != waitpid(childPid, &wstatus, 0), "wait failed");

      if(WIFEXITED(wstatus))
      {
	if(WEXITSTATUS(wstatus) != EXIT_SUCCESS)
	{
	  printf("neuspeh ");
	  continue;
	}
      }

      FILE *fp = fdopen(pipeFds[0], "r");
      osAssert(NULL != fp, "fdopen failed");

      char velicina[256];

      osAssert(1 == fscanf(fp,"%s",velicina),"fscanf failed");
      printf("%s ",velicina);
      fclose(fp);
      close(pipeFds[0]);
    }
  }
  printf("\n");

  return 0;
}