KernelLand/Kernel/drv/vterm_input.c

   1 /*
   2  * Acess2 Kernel
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * drv/vterm_input.c
   6  * - Virtual Terminal - Input code
   7  */
   8 #include "vterm.h"
   9 #include <api_drv_keyboard.h>
  10
  11 // === GLOBALS ===
  12 // --- Key States --- (Used for VT Switching/Magic Combos)
  13  int    gbVT_CtrlDown = 0;
  14  int    gbVT_AltDown = 0;
  15  int    gbVT_SysrqDown = 0;
  16
  17 // === CODE ===
  18 /**
  19  * \fn void VT_InitInput()
  20  * \brief Initialises the input
  21  */
  22 void VT_InitInput()
  23 {
  24         giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
  25         if(giVT_InputDevHandle == -1) {
  26                 Log_Warning("VTerm", "Can't open the input device '%s'", gsVT_InputDevice);
  27                 return ;
  28         }
  29         VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
  30 }
  31
  32 /**
  33  * \fn void VT_KBCallBack(Uint32 Codepoint)
  34  * \brief Called on keyboard interrupt
  35  * \param Codepoint     Pseudo-UTF32 character
  36  *
  37  * Handles a key press and sends the key code to the user's buffer.
  38  * If the code creates a kernel-magic sequence, it is not passed to the
  39  * user and is handled in-kernel.
  40  */
  41 void VT_KBCallBack(Uint32 Codepoint)
  42 {
  43         tVTerm  *term = gpVT_CurTerm;
  44
  45         // Catch VT binds
  46         switch( Codepoint & KEY_ACTION_MASK )
  47         {
  48         case KEY_ACTION_RAWSYM:
  49                 term->RawScancode = Codepoint & KEY_CODEPOINT_MASK;
  50                 break;
  51         case KEY_ACTION_RELEASE:
  52                 switch(term->RawScancode)
  53                 {
  54                 case KEYSYM_LEFTALT:    gbVT_AltDown &= ~1;     break;
  55                 case KEYSYM_RIGHTALT:   gbVT_AltDown &= ~2;     break;
  56                 case KEYSYM_LEFTCTRL:   gbVT_CtrlDown &= ~1;    break;
  57                 case KEYSYM_RIGHTCTRL:  gbVT_CtrlDown &= ~2;    break;
  58                 }
  59                 break;
  60
  61         case KEY_ACTION_PRESS:
  62                 switch(term->RawScancode)
  63                 {
  64                 case KEYSYM_LEFTALT:    gbVT_AltDown |= 1;      break;
  65                 case KEYSYM_RIGHTALT:   gbVT_AltDown |= 2;      break;
  66                 case KEYSYM_LEFTCTRL:   gbVT_CtrlDown |= 1;     break;
  67                 case KEYSYM_RIGHTCTRL:  gbVT_CtrlDown |= 2;     break;
  68                 }
  69
  70                 // Check if the magic keys are held
  71                 if(!gbVT_AltDown || !gbVT_CtrlDown)
  72                         break;
  73
  74                 switch(term->RawScancode)
  75                 {
  76                 case KEYSYM_F1 :        VT_SetTerminal(0);      return;
  77                 case KEYSYM_F2 :        VT_SetTerminal(1);      return;
  78                 case KEYSYM_F3 :        VT_SetTerminal(2);      return;
  79                 case KEYSYM_F4 :        VT_SetTerminal(3);      return;
  80                 case KEYSYM_F5 :        VT_SetTerminal(4);      return;
  81                 case KEYSYM_F6 :        VT_SetTerminal(5);      return;
  82                 case KEYSYM_F7 :        VT_SetTerminal(6);      return;
  83                 case KEYSYM_F8 :        VT_SetTerminal(7);      return;
  84                 case KEYSYM_F9 :        VT_SetTerminal(8);      return;
  85                 case KEYSYM_F10:        VT_SetTerminal(9);      return;
  86                 case KEYSYM_F11:        VT_SetTerminal(10);     return;
  87                 case KEYSYM_F12:        VT_SetTerminal(11);     return;
  88                 }
  89
  90                 // Scrolling is only valid in text mode
  91                 if(term->Mode != TERM_MODE_TEXT)
  92                         break;
  93
  94                 switch(term->RawScancode)
  95                 {
  96                 // Scrolling
  97                 case KEYSYM_PGUP:
  98                         if( term->Flags & VT_FLAG_ALTBUF )
  99                                 return ;
 100                         term->ViewPos = MAX( 0, term->ViewPos - term->Width );
 101                         return;
 102                 case KEYSYM_PGDN:
 103                         if( term->Flags & VT_FLAG_ALTBUF )
 104                                 return ;
 105                         term->ViewPos = MIN(
 106                                 term->ViewPos + term->Width,
 107                                 term->Width * term->Height * giVT_Scrollback
 108                                 );
 109                         return;
 110                 }
 111                 break;
 112         }
 113
 114         // Encode key
 115         if(term->Mode == TERM_MODE_TEXT)
 116         {
 117                 Uint8   buf[6] = {0};
 118                  int    len = 0;
 119
 120                 // Ignore anything that isn't a press or refire
 121                 if( (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_PRESS
 122                  && (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_REFIRE
 123                     )
 124                 {
 125                         return ;
 126                 }
 127
 128                 Codepoint &= KEY_CODEPOINT_MASK;
 129
 130                 // Ignore Modifer Keys
 131                 if(Codepoint > KEY_MODIFIERS)   return;
 132
 133                 // Get UTF-8/ANSI Encoding
 134                 if( Codepoint == 0 )
 135                 {
 136                         // Non-printable keys
 137                         switch(term->RawScancode)
 138                         {
 139                         case KEYSYM_LEFTARROW:
 140                         case KEYSYM_KP4:
 141                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'D';
 142                                 len = 3;
 143                                 break;
 144                         case KEYSYM_RIGHTARROW:
 145                         case KEYSYM_KP6:
 146                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'C';
 147                                 len = 3;
 148                                 break;
 149                         case KEYSYM_UPARROW:
 150                         case KEYSYM_KP8:
 151                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'A';
 152                                 len = 3;
 153                                 break;
 154                         case KEYSYM_DOWNARROW:
 155                         case KEYSYM_KP2:
 156                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'B';
 157                                 len = 3;
 158                                 break;
 159
 160                         case KEYSYM_PGUP:
 161                         case KEYSYM_KP9:        // If Codepoint=0, It's page up
 162                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '5'; buf[3] = '~';
 163                                 len = 4;
 164                                 break;
 165                         case KEYSYM_PGDN:
 166                         case KEYSYM_KP3:        // If Codepoint=0, It's page down
 167                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '6'; buf[3] = '~';
 168                                 len = 4;
 169                                 break;
 170
 171                         case KEYSYM_HOME:
 172                         case KEYSYM_KP7:
 173                                 buf[0] = '\x1B'; buf[1] = 'O'; buf[2] = 'H';
 174                                 len = 3;
 175                                 break;
 176                         case KEYSYM_END:
 177                         case KEYSYM_KP1:
 178                                 buf[0] = '\x1B'; buf[1] = 'O'; buf[2] = 'F';
 179                                 len = 3;
 180                                 break;
 181
 182                         case KEYSYM_INSERT:
 183                         case KEYSYM_KP0:
 184                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '2'; buf[3] = '~';
 185                                 len = 4;
 186                                 break;
 187                         case KEYSYM_DELETE:
 188                         case KEYSYM_KPPERIOD:
 189                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '3'; buf[3] = '~';
 190                                 len = 4;
 191                                 break;
 192                         }
 193                 }
 194                 else
 195                 {
 196                         // Attempt to encode in UTF-8
 197                         len = WriteUTF8( buf, Codepoint );
 198                         if(len == 0) {
 199                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
 200                         }
 201                 }
 202
 203                 if(len == 0) {
 204                         // Unprintable / Don't Pass
 205                         return;
 206                 }
 207
 208                 // TODO: Implement Ctrl-C etc
 209 #if 0
 210                 // Handle meta characters
 211                 if( !(term->Flags & VT_FLAG_RAWIN) )
 212                 {
 213                         switch(buf[0])
 214                         {
 215                         case '\3':      // ^C
 216
 217                                 break;
 218                         }
 219                 }
 220 #endif
 221
 222                 // Write
 223                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
 224                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
 225                 else {
 226                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
 227                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
 228                 }
 229                 // Roll the buffer over
 230                 term->InputWrite += len;
 231                 term->InputWrite %= MAX_INPUT_CHARS8;
 232                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
 233                         term->InputRead = term->InputWrite + 1;
 234                         term->InputRead %= MAX_INPUT_CHARS8;
 235                 }
 236         }
 237         else
 238         {
 239                 // Encode the raw key event
 240                 Uint32  *raw_in = (void*)term->InputBuffer;
 241
 242                 #if 0
 243                 // Drop new keys
 244                 if( term->InputWrite == term->InputRead )
 245                         return ;
 246                 #endif
 247
 248                 raw_in[ term->InputWrite ] = Codepoint;
 249                 term->InputWrite ++;
 250                 if(term->InputWrite >= MAX_INPUT_CHARS32)
 251                         term->InputWrite -= MAX_INPUT_CHARS32;
 252
 253                 #if 1
 254                 // TODO: Should old or new be dropped?
 255                 if(term->InputRead == term->InputWrite) {
 256                         term->InputRead ++;
 257                         if( term->InputRead >= MAX_INPUT_CHARS32 )
 258                                 term->InputRead -= MAX_INPUT_CHARS32;
 259                 }
 260                 #endif
 261         }
 262
 263         VFS_MarkAvaliable(&term->Node, 1);
 264 }
 265