rf.c 751 B

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  1. /* $Id$ */
  2. /*
  3. * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
  4. *
  5. * This product is part of the Amsterdam Compiler Kit.
  6. *
  7. * Permission to use, sell, duplicate or disclose this software must be
  8. * obtained in writing. Requests for such permissions may be sent to
  9. *
  10. * Dr. Andrew S. Tanenbaum
  11. * Wiskundig Seminarium
  12. * Vrije Universiteit
  13. * Postbox 7161
  14. * 1007 MC Amsterdam
  15. * The Netherlands
  16. *
  17. */
  18. #include <pc_file.h>
  19. #include <pc_err.h>
  20. extern struct file *_curfil;
  21. extern _trp();
  22. extern _incpt();
  23. _rf(f) struct file *f; {
  24. _curfil = f;
  25. if ((f->flags&0377) != MAGIC)
  26. _trp(EBADF);
  27. if (f->flags & WRBIT)
  28. _trp(EREADF);
  29. if ((f->flags & WINDOW) == 0)
  30. _incpt(f);
  31. }