reactos/lib/sdk/crt/conio/getch.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS system libraries
   4  * FILE:        lib/msvcrt/conio/getch.c
   5  * PURPOSE:     Writes a character to stdout
   6  * PROGRAMER:   Ariadne
   7  * UPDATE HISTORY:
   8  *              28/12/98: Created
   9  */
  10
  11 #include <precomp.h>
  12
  13 /*
  14  * @implemented
  15  */
  16 int _getch(void)
  17 {
  18     DWORD NumberOfCharsRead = 0;
  19     char c;
  20     HANDLE ConsoleHandle;
  21     BOOL RestoreMode;
  22     DWORD ConsoleMode;
  23
  24     if (char_avail) {
  25         c = ungot_char;
  26         char_avail = 0;
  27     } else {
  28         /*
  29          * _getch() is documented to NOT echo characters. Testing shows it
  30          * doesn't wait for a CR either. So we need to switch off
  31          * ENABLE_ECHO_INPUT and ENABLE_LINE_INPUT if they're currently
  32          * switched on.
  33          */
  34         ConsoleHandle = (HANDLE) _get_osfhandle(stdin->_file);
  35         RestoreMode = GetConsoleMode(ConsoleHandle, &ConsoleMode) &&
  36                       (0 != (ConsoleMode &
  37                              (ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT)));
  38         if (RestoreMode) {
  39             SetConsoleMode(ConsoleHandle,
  40                            ConsoleMode & (~ (ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT)));
  41         }
  42         ReadConsoleA((HANDLE)_get_osfhandle(stdin->_file),
  43                              &c,
  44                              1,
  45                              &NumberOfCharsRead,
  46                              NULL);
  47         if (RestoreMode) {
  48             SetConsoleMode(ConsoleHandle, ConsoleMode);
  49         }
  50     }
  51     if (c == 10)
  52         c = 13;
  53     return c;
  54 }
  55