mirror of
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100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS system libraries
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* FILE: lib/sdk/crt/conio/kbhit.c
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* PURPOSE: Checks for keyboard hits
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* PROGRAMERS: Ariadne, Russell
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* UPDATE HISTORY:
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* 28/12/98: Created
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* 27/9/08: An almost 100% working version of _kbhit()
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*/
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#include <precomp.h>
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static CRITICAL_SECTION CriticalSection;
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volatile BOOL CriticalSectionInitialized=FALSE;
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/*
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* @implemented
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*/
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int _kbhit(void)
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{
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PINPUT_RECORD InputRecord = NULL;
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DWORD NumberRead = 0;
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DWORD EventsRead = 0;
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DWORD RecordIndex = 0;
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DWORD BufferIndex = 0;
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HANDLE StdInputHandle = 0;
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DWORD ConsoleInputMode = 0;
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/* Attempt some thread safety */
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if (!CriticalSectionInitialized)
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{
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InitializeCriticalSectionAndSpinCount(&CriticalSection, 0x80000400);
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CriticalSectionInitialized = TRUE;
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}
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EnterCriticalSection(&CriticalSection);
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if (char_avail)
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{
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LeaveCriticalSection(&CriticalSection);
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return 1;
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}
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StdInputHandle = GetStdHandle(STD_INPUT_HANDLE);
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/* Turn off processed input so we get key modifiers as well */
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GetConsoleMode(StdInputHandle, &ConsoleInputMode);
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SetConsoleMode(StdInputHandle, ConsoleInputMode & ~ENABLE_PROCESSED_INPUT);
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/* Start the process */
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if (!GetNumberOfConsoleInputEvents(StdInputHandle, &EventsRead))
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{
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LeaveCriticalSection(&CriticalSection);
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return 0;
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}
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if (!EventsRead)
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{
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LeaveCriticalSection(&CriticalSection);
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return 0;
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}
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if (!(InputRecord = (PINPUT_RECORD)malloc(EventsRead * sizeof(INPUT_RECORD))))
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{
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LeaveCriticalSection(&CriticalSection);
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return 0;
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}
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if (!PeekConsoleInput(StdInputHandle, InputRecord, EventsRead, &NumberRead))
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{
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free(InputRecord);
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LeaveCriticalSection(&CriticalSection);
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return 0;
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}
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for (RecordIndex = 0; RecordIndex < NumberRead; RecordIndex++)
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{
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if (InputRecord[RecordIndex].EventType == KEY_EVENT &&
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InputRecord[RecordIndex].Event.KeyEvent.bKeyDown)
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{
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BufferIndex = 1;
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break;
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}
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}
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free(InputRecord);
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/* Restore console input mode */
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SetConsoleMode(StdInputHandle, ConsoleInputMode);
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LeaveCriticalSection(&CriticalSection);
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return BufferIndex;
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}
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