reactos/lib/crtdll/conio/ungetch.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  *              Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details
   4  * PROJECT:     ReactOS system libraries
   5  * FILE:        lib/crtdll/conio/ungetch.c
   6  * PURPOSE:     Ungets a character from stdin
   7  * PROGRAMER:   DJ Delorie
   8                 Boudewijn Dekker [ Adapted from djgpp libc ]
   9  * UPDATE HISTORY:
  10  *              28/12/98: Created
  11  */
  12
  13 #include <crtdll/process.h>
  14 #define EOF -1
  15
  16 int char_avail = 0;
  17 char ungot_char = 0;
  18
  19
  20 int
  21 _ungetch(int c)
  22 {
  23   if (char_avail)
  24     return(EOF);
  25   ungot_char = c;
  26   char_avail = 1;
  27   return(c);
  28 }