read.c 602 B

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  1. /* $Source$
  2. * $State$
  3. * $Revision$
  4. */
  5. #include <stdlib.h>
  6. #include <errno.h>
  7. #include <unistd.h>
  8. #include "libsys.h"
  9. int read(int fd, void* buffer, size_t count)
  10. {
  11. char i;
  12. /* We're only allowed to read from fd 0, 1 or 2. */
  13. if ((fd < 0) || (fd > 2))
  14. {
  15. errno = EBADF;
  16. return -1;
  17. }
  18. /* Empty buffer? */
  19. if (count == 0)
  20. return 0;
  21. /* Read one byte. */
  22. i = _sys_rawread();
  23. #if 0
  24. if ((i == '\r') && !(_sys_ttyflags & RAW))
  25. i = '\n';
  26. if (_sys_ttyflags & ECHO)
  27. _sys_write_tty(i);
  28. #endif
  29. if (i == '\r')
  30. i = '\n';
  31. _sys_write_tty(i);
  32. *(char*)buffer = i;
  33. return 1;
  34. }