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 #include <termios.h>
  13
  14 #ifdef SCO_5_STDIO
  15 # define _ptr  __ptr
  16 # define _cnt  __cnt
  17 # define _base __base
  18 # define _filbuf(fp)  ((fp)->__cnt = 0, __filbuf(fp))
  19 #endif
  20
  21
  22 void
  23 discard (FILE *io)
  24 {
  25     if (io == NULL)
  26         return;
  27
  28     tcflush (fileno(io), TCOFLUSH);
  29
  30 #if defined(_FSTDIO) || defined(__DragonFly__)
  31     fpurge (io);
  32 #else
  33 # ifdef LINUX_STDIO
  34     io->_IO_write_ptr = io->_IO_write_base;
  35 # else
  36     if ((io->_ptr = io->_base))
  37         io->_cnt = 0;
  38 # endif
  39 #endif
  40 }
  41