com32/lib/sys/screensize.c


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#include <unistd.h>
#include <errno.h>
#include "file.h"

int getscreensize(int fd, int *rows, int *cols)
{
  struct file_info *fp = &__file_info[fd];

  if ( fd >= NFILES || !fp->iop ) {
    errno = EBADF;
    return -1;
  }

  *rows = fp->o.rows;
  *cols = fp->o.cols;

  if (!rows || !cols) {
    errno = ENOTTY;
    return -1;
  }

  return 0;
}