#define _BSD_SOURCE 1

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define TERM_WIDTH 80

void chill(long nanosecs) {
	static struct timespec req, rem;
	req.tv_nsec = nanosecs;
	
	nanosleep(&req, &rem);
}

int
determine_screen_width (void)
{
  /* If there's a way to get the terminal size using POSIX
     tcgetattr(), somebody please tell me.  */
#ifdef TIOCGWINSZ
  int fd;
  struct winsize wsz;

  fd = fileno (stderr);
  if (ioctl (fd, TIOCGWINSZ, &wsz) < 0)
    return 0;                   /* most likely ENOTTY */

  return wsz.ws_col;
#elif defined(WINDOWS)
  CONSOLE_SCREEN_BUFFER_INFO csbi;
  if (!GetConsoleScreenBufferInfo (GetStdHandle (STD_ERROR_HANDLE), &csbi))
    return 0;
  return csbi.dwSize.X;
#else  /* neither TIOCGWINSZ nor WINDOWS */
  return 0;
#endif /* neither TIOCGWINSZ nor WINDOWS */
}

int main(int argc, char** argv) {
	char* bar;
	int i, term_width, bar_width;
	
	term_width = determine_screen_width();
	bar_width  = term_width - 1;
	
	bar = malloc(term_width);
	
	memset(bar, ' ', bar_width);
	bar[1] = '[';
	bar[bar_width - 1] = ']';
	
	for( i = 2; i < bar_width - 1; i++ ) {
		bar[i] = '*';
		printf("\r%s", bar);	// '\r' is a carriage return -- resets the cursor position to the beginning of the line
		fflush(stdout);		// necessary or we don't get any output until after this loop
		chill(50000000);	// chill like a panther in a tree
	}
	
	printf("\n");
}