📄 getch.c
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/***
*getch.c - contains _getch(), _getche(), _ungetch() and kbhit for Win32
*
* Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines the "direct console" functions listed above.
*
* NOTE: The real-mode DOS versions of these functions read from
* standard input and are therefore redirected when standard input
* is redirected. However, these versions ALWAYS read from the console,
* even when standard input is redirected.
*
*******************************************************************************/
#include <cruntime.h>
#include <oscalls.h>
#include <conio.h>
#include <internal.h>
#include <mtdll.h>
#include <stdio.h>
#include <stdlib.h>
#include <dbgint.h>
typedef struct {
unsigned char LeadChar;
unsigned char SecondChar;
} CharPair;
typedef struct {
unsigned short ScanCode;
CharPair RegChars;
CharPair ShiftChars;
CharPair CtrlChars;
CharPair AltChars;
} EnhKeyVals;
typedef struct {
CharPair RegChars;
CharPair ShiftChars;
CharPair CtrlChars;
CharPair AltChars;
} NormKeyVals;
/*
* Table of key values for enhanced keys
*/
static EnhKeyVals EnhancedKeys[] = {
{ 28, { 13, 0 }, { 13, 0 }, { 10, 0 }, { 0, 166 } },
{ 53, { 47, 0 }, { 63, 0 }, { 0, 149 }, { 0, 164 } },
{ 71, { 224, 71 }, { 224, 71 }, { 224, 119 }, { 0, 151 } },
{ 72, { 224, 72 }, { 224, 72 }, { 224, 141 }, { 0, 152 } },
{ 73, { 224, 73 }, { 224, 73 }, { 224, 134 }, { 0, 153 } },
{ 75, { 224, 75 }, { 224, 75 }, { 224, 115 }, { 0, 155 } },
{ 77, { 224, 77 }, { 224, 77 }, { 224, 116 }, { 0, 157 } },
{ 79, { 224, 79 }, { 224, 79 }, { 224, 117 }, { 0, 159 } },
{ 80, { 224, 80 }, { 224, 80 }, { 224, 145 }, { 0, 160 } },
{ 81, { 224, 81 }, { 224, 81 }, { 224, 118 }, { 0, 161 } },
{ 82, { 224, 82 }, { 224, 82 }, { 224, 146 }, { 0, 162 } },
{ 83, { 224, 83 }, { 224, 83 }, { 224, 147 }, { 0, 163 } }
};
/*
* macro for the number of elements of in EnhancedKeys[]
*/
#define NUM_EKA_ELTS ( sizeof( EnhancedKeys ) / sizeof( EnhKeyVals ) )
/*
* Table of key values for normal keys. Note that the table is padded so
* that the key scan code serves as an index into the table.
*/
static NormKeyVals NormalKeys[] = {
/* padding */
{ /* 0 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 1 */ { 27, 0 }, { 27, 0 }, { 27, 0 }, { 0, 1 } },
{ /* 2 */ { 49, 0 }, { 33, 0 }, { 0, 0 }, { 0, 120 } },
{ /* 3 */ { 50, 0 }, { 64, 0 }, { 0, 3 }, { 0, 121 } },
{ /* 4 */ { 51, 0 }, { 35, 0 }, { 0, 0 }, { 0, 122 } },
{ /* 5 */ { 52, 0 }, { 36, 0 }, { 0, 0 }, { 0, 123 } },
{ /* 6 */ { 53, 0 }, { 37, 0 }, { 0, 0 }, { 0, 124 } },
{ /* 7 */ { 54, 0 }, { 94, 0 }, { 30, 0 }, { 0, 125 } },
{ /* 8 */ { 55, 0 }, { 38, 0 }, { 0, 0 }, { 0, 126 } },
{ /* 9 */ { 56, 0 }, { 42, 0 }, { 0, 0 }, { 0, 127 } },
{ /* 10 */ { 57, 0 }, { 40, 0 }, { 0, 0 }, { 0, 128 } },
{ /* 11 */ { 48, 0 }, { 41, 0 }, { 0, 0 }, { 0, 129 } },
{ /* 12 */ { 45, 0 }, { 95, 0 }, { 31, 0 }, { 0, 130 } },
{ /* 13 */ { 61, 0 }, { 43, 0 }, { 0, 0 }, { 0, 131 } },
{ /* 14 */ { 8, 0 }, { 8, 0 }, { 127, 0 }, { 0, 14 } },
{ /* 15 */ { 9, 0 }, { 0, 15 }, { 0, 148 }, { 0, 15 } },
{ /* 16 */ { 113, 0 }, { 81, 0 }, { 17, 0 }, { 0, 16 } },
{ /* 17 */ { 119, 0 }, { 87, 0 }, { 23, 0 }, { 0, 17 } },
{ /* 18 */ { 101, 0 }, { 69, 0 }, { 5, 0 }, { 0, 18 } },
{ /* 19 */ { 114, 0 }, { 82, 0 }, { 18, 0 }, { 0, 19 } },
{ /* 20 */ { 116, 0 }, { 84, 0 }, { 20, 0 }, { 0, 20 } },
{ /* 21 */ { 121, 0 }, { 89, 0 }, { 25, 0 }, { 0, 21 } },
{ /* 22 */ { 117, 0 }, { 85, 0 }, { 21, 0 }, { 0, 22 } },
{ /* 23 */ { 105, 0 }, { 73, 0 }, { 9, 0 }, { 0, 23 } },
{ /* 24 */ { 111, 0 }, { 79, 0 }, { 15, 0 }, { 0, 24 } },
{ /* 25 */ { 112, 0 }, { 80, 0 }, { 16, 0 }, { 0, 25 } },
{ /* 26 */ { 91, 0 }, { 123, 0 }, { 27, 0 }, { 0, 26 } },
{ /* 27 */ { 93, 0 }, { 125, 0 }, { 29, 0 }, { 0, 27 } },
{ /* 28 */ { 13, 0 }, { 13, 0 }, { 10, 0 }, { 0, 28 } },
/* padding */
{ /* 29 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 30 */ { 97, 0 }, { 65, 0 }, { 1, 0 }, { 0, 30 } },
{ /* 31 */ { 115, 0 }, { 83, 0 }, { 19, 0 }, { 0, 31 } },
{ /* 32 */ { 100, 0 }, { 68, 0 }, { 4, 0 }, { 0, 32 } },
{ /* 33 */ { 102, 0 }, { 70, 0 }, { 6, 0 }, { 0, 33 } },
{ /* 34 */ { 103, 0 }, { 71, 0 }, { 7, 0 }, { 0, 34 } },
{ /* 35 */ { 104, 0 }, { 72, 0 }, { 8, 0 }, { 0, 35 } },
{ /* 36 */ { 106, 0 }, { 74, 0 }, { 10, 0 }, { 0, 36 } },
{ /* 37 */ { 107, 0 }, { 75, 0 }, { 11, 0 }, { 0, 37 } },
{ /* 38 */ { 108, 0 }, { 76, 0 }, { 12, 0 }, { 0, 38 } },
{ /* 39 */ { 59, 0 }, { 58, 0 }, { 0, 0 }, { 0, 39 } },
{ /* 40 */ { 39, 0 }, { 34, 0 }, { 0, 0 }, { 0, 40 } },
{ /* 41 */ { 96, 0 }, { 126, 0 }, { 0, 0 }, { 0, 41 } },
/* padding */
{ /* 42 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 43 */ { 92, 0 }, { 124, 0 }, { 28, 0 }, { 0, 0 } },
{ /* 44 */ { 122, 0 }, { 90, 0 }, { 26, 0 }, { 0, 44 } },
{ /* 45 */ { 120, 0 }, { 88, 0 }, { 24, 0 }, { 0, 45 } },
{ /* 46 */ { 99, 0 }, { 67, 0 }, { 3, 0 }, { 0, 46 } },
{ /* 47 */ { 118, 0 }, { 86, 0 }, { 22, 0 }, { 0, 47 } },
{ /* 48 */ { 98, 0 }, { 66, 0 }, { 2, 0 }, { 0, 48 } },
{ /* 49 */ { 110, 0 }, { 78, 0 }, { 14, 0 }, { 0, 49 } },
{ /* 50 */ { 109, 0 }, { 77, 0 }, { 13, 0 }, { 0, 50 } },
{ /* 51 */ { 44, 0 }, { 60, 0 }, { 0, 0 }, { 0, 51 } },
{ /* 52 */ { 46, 0 }, { 62, 0 }, { 0, 0 }, { 0, 52 } },
{ /* 53 */ { 47, 0 }, { 63, 0 }, { 0, 0 }, { 0, 53 } },
/* padding */
{ /* 54 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 55 */ { 42, 0 }, { 0, 0 }, { 114, 0 }, { 0, 0 } },
/* padding */
{ /* 56 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 57 */ { 32, 0 }, { 32, 0 }, { 32, 0 }, { 32, 0 } },
/* padding */
{ /* 58 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 59 */ { 0, 59 }, { 0, 84 }, { 0, 94 }, { 0, 104 } },
{ /* 60 */ { 0, 60 }, { 0, 85 }, { 0, 95 }, { 0, 105 } },
{ /* 61 */ { 0, 61 }, { 0, 86 }, { 0, 96 }, { 0, 106 } },
{ /* 62 */ { 0, 62 }, { 0, 87 }, { 0, 97 }, { 0, 107 } },
{ /* 63 */ { 0, 63 }, { 0, 88 }, { 0, 98 }, { 0, 108 } },
{ /* 64 */ { 0, 64 }, { 0, 89 }, { 0, 99 }, { 0, 109 } },
{ /* 65 */ { 0, 65 }, { 0, 90 }, { 0, 100 }, { 0, 110 } },
{ /* 66 */ { 0, 66 }, { 0, 91 }, { 0, 101 }, { 0, 111 } },
{ /* 67 */ { 0, 67 }, { 0, 92 }, { 0, 102 }, { 0, 112 } },
{ /* 68 */ { 0, 68 }, { 0, 93 }, { 0, 103 }, { 0, 113 } },
/* padding */
{ /* 69 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 70 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 71 */ { 0, 71 }, { 55, 0 }, { 0, 119 }, { 0, 0 } },
{ /* 72 */ { 0, 72 }, { 56, 0 }, { 0, 141 }, { 0, 0 } },
{ /* 73 */ { 0, 73 }, { 57, 0 }, { 0, 132 }, { 0, 0 } },
{ /* 74 */ { 0, 0 }, { 45, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 75 */ { 0, 75 }, { 52, 0 }, { 0, 115 }, { 0, 0 } },
{ /* 76 */ { 0, 0 }, { 53, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 77 */ { 0, 77 }, { 54, 0 }, { 0, 116 }, { 0, 0 } },
{ /* 78 */ { 0, 0 }, { 43, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 79 */ { 0, 79 }, { 49, 0 }, { 0, 117 }, { 0, 0 } },
{ /* 80 */ { 0, 80 }, { 50, 0 }, { 0, 145 }, { 0, 0 } },
{ /* 81 */ { 0, 81 }, { 51, 0 }, { 0, 118 }, { 0, 0 } },
{ /* 82 */ { 0, 82 }, { 48, 0 }, { 0, 146 }, { 0, 0 } },
{ /* 83 */ { 0, 83 }, { 46, 0 }, { 0, 147 }, { 0, 0 } },
/* padding */
{ /* 84 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 85 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 86 */ { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } },
{ /* 87 */ { 224, 133 }, { 224, 135 }, { 224, 137 }, { 224, 139 } },
{ /* 88 */ { 224, 134 }, { 224, 136 }, { 224, 138 }, { 224, 140 } }
};
/*
* This is the one character push-back buffer used by _getch(), _getche()
* and _ungetch().
*/
static int chbuf = EOF;
/*
* Declaration for console handle
*/
extern int _coninpfh;
/*
* Function that looks up the extended key code for a given event.
*/
static CharPair * __cdecl _getextendedkeycode(KEY_EVENT_RECORD *);
/***
*int _getch(), _getche() - read one char. from console (without and with echo)
*
*Purpose:
* If the "_ungetch()" push-back buffer is not empty (empty==-1) Then
* Mark it empty (-1) and RETURN the value that was in it
* Read a character using ReadConsole in RAW mode
* Return the Character Code
* _getche(): Same as _getch() except that the character value returned
* is echoed (via "_putch()")
*
*Entry:
* None, reads from console.
*
*Exit:
* If an error is returned from the API
* Then EOF
* Otherwise
* next byte from console
* Static variable "chbuf" may be altered
*
*Exceptions:
*
*******************************************************************************/
#ifdef _MT
int __cdecl _getch (
void
)
{
int ch;
_mlock(_CONIO_LOCK); /* secure the console lock */
ch = _getch_lk(); /* input the character */
_munlock(_CONIO_LOCK); /* release the console lock */
return ch;
}
int __cdecl _getche (
void
)
{
int ch;
_mlock(_CONIO_LOCK); /* secure the console lock */
ch = _getche_lk(); /* input and echo the character */
_munlock(_CONIO_LOCK); /* unlock the console */
return ch;
}
#endif /* _MT */
#ifdef _MT
int __cdecl _getch_lk (
#else /* _MT */
int __cdecl _getch (
#endif /* _MT */
void
)
{
INPUT_RECORD ConInpRec;
DWORD NumRead;
CharPair *pCP;
int ch = 0; /* single character buffer */
DWORD oldstate;
/*
* check pushback buffer (chbuf) a for character
*/
if ( chbuf != EOF ) {
/*
* something there, clear buffer and return the character.
*/
ch = (unsigned char)(chbuf & 0xFF);
chbuf = EOF;
return ch;
}
if (_coninpfh == -1)
return EOF;
/*
* _coninpfh, the handle to the console input, is created the first
* time that either _getch() or _cgets() or _kbhit() is called.
*/
if ( _coninpfh == -2 )
__initconin();
/*
* Switch to raw mode (no line input, no echo input)
*/
GetConsoleMode( (HANDLE)_coninpfh, &oldstate );
SetConsoleMode( (HANDLE)_coninpfh, 0L );
for ( ; ; ) {
/*
* Get a console input event.
*/
if ( !ReadConsoleInput( (HANDLE)_coninpfh,
&ConInpRec,
1L,
&NumRead )
|| (NumRead == 0L) )
{
ch = EOF;
break;
}
/*
* Look for, and decipher, key events.
*/
if ( (ConInpRec.EventType == KEY_EVENT) &&
ConInpRec.Event.KeyEvent.bKeyDown ) {
/*
* Easy case: if uChar.AsciiChar is non-zero, just stuff it
* into ch and quit.
*/
if ( ch = (unsigned char)ConInpRec.Event.KeyEvent.uChar.AsciiChar )
break;
/*
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