char *readline(FILE *fp) {
  char buff[BUFFSIZE];
  int len;
  int copylen;
  char *ln;
  char *str;
  char *ptr;

  len = BUFFSIZE;
  str = malloc(len*sizeof(*str));

  while(fgets(buff, BUFFSIZE, fp) != NULL) {
    if((ln = strchr(buff, '\n')) != NULL) {
      copylen = ln - BUFFSIZE;
      if((ptr = realloc(str, len + copylen)) == NULL) { //FAIL }

      strncat(str, buff, copylen);
      return str;
    }
    else {
      len += BUFFSIZE;
      if((ptr = realloc(str, len)) == NULL) { //FAIL }

      strcat(str, buff);
    }
  }
}