#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int main(int argc, char **argv) {
  if (argc != 2) {
    fprintf(stderr, "Wrong argument count!\n");
    return 1;
  }

  int fd = open(argv[1], O_RDWR);
  if (fd == -1) {
    perror("Opening the file failed");
    return 1;
  }

  int newSize = 0;

  while (1) {
    char buf[256];
    int cnt = read(fd, buf, 256);
    if (cnt <= 0) {
      close(fd);
      return 0;
    }

    char *nlPos = memchr(buf, '\n', cnt);
    if (!nlPos) {
      newSize += cnt;
      continue;
    }
    newSize += nlPos - buf + 1;
    break;
  };

  ftruncate(fd, newSize);
  close(fd);

  return 0;
}