diplodocus.org Git - nmh/blob - sbr/discard.c

   1
   2 /*
   3  * discard.c -- discard output on a file pointer
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12 #ifdef HAVE_TERMIOS_H
  13 # include <termios.h>
  14 #else
  15 # ifdef HAVE_TERMIO_H
  16 #  include <termio.h>
  17 # else
  18 #  include <sgtty.h>
  19 # endif
  20 #endif
  21
  22 #ifdef SCO_5_STDIO
  23 # define _ptr  __ptr
  24 # define _cnt  __cnt
  25 # define _base __base
  26 # define _filbuf(fp)  ((fp)->__cnt = 0, __filbuf(fp))
  27 #endif
  28
  29
  30 void
  31 discard (FILE *io)
  32 {
  33 #ifndef HAVE_TERMIOS_H
  34 # ifdef HAVE_TERMIO_H
  35     struct termio tio;
  36 # else
  37     struct sgttyb tio;
  38 # endif
  39 #endif
  40
  41     if (io == NULL)
  42         return;
  43
  44 #ifdef HAVE_TERMIOS_H
  45     tcflush (fileno(io), TCOFLUSH);
  46 #else
  47 # ifdef HAVE_TERMIO_H
  48     if (ioctl (fileno(io), TCGETA, &tio) != -1)
  49         ioctl (fileno(io), TCSETA, &tio);
  50 # else
  51     if (ioctl (fileno(io), TIOCGETP, (char *) &tio) != -1)
  52         ioctl (fileno(io), TIOCSETP, (char *) &tio);
  53 # endif
  54 #endif
  55
  56 #if defined(_FSTDIO) || defined(__DragonFly__)
  57     fpurge (io);
  58 #else
  59 # ifdef LINUX_STDIO
  60     io->_IO_write_ptr = io->_IO_write_base;
  61 # else
  62     if ((io->_ptr = io->_base))
  63         io->_cnt = 0;
  64 # endif
  65 #endif
  66 }
  67