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 #define DEBUG   1
  11
  12 // === GLOBALS ===
  13 // --- Key States --- (Used for VT Switching/Magic Combos)
  14  int    gbVT_CtrlDown = 0;
  15  int    gbVT_AltDown = 0;
  16  int    gbVT_SysrqDown = 0;
  17
  18 // === CODE ===
  19 /**
  20  * \fn void VT_InitInput()
  21  * \brief Initialises the input
  22  */
  23 void VT_InitInput()
  24 {
  25         giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
  26         if(giVT_InputDevHandle == -1) {
  27                 Log_Warning("VTerm", "Can't open the input device '%s'", gsVT_InputDevice);
  28                 return ;
  29         }
  30         VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
  31         LOG("VTerm input initialised");
  32 }
  33
  34 /**
  35  * \fn void VT_KBCallBack(Uint32 Codepoint)
  36  * \brief Called on keyboard interrupt
  37  * \param Codepoint     Pseudo-UTF32 character
  38  *
  39  * Handles a key press and sends the key code to the user's buffer.
  40  * If the code creates a kernel-magic sequence, it is not passed to the
  41  * user and is handled in-kernel.
  42  */
  43 void VT_KBCallBack(Uint32 Codepoint)
  44 {
  45         tVTerm  *term = gpVT_CurTerm;
  46
  47         // Catch VT binds
  48         switch( Codepoint & KEY_ACTION_MASK )
  49         {
  50         case KEY_ACTION_RAWSYM:
  51                 term->RawScancode = Codepoint & KEY_CODEPOINT_MASK;
  52                 break;
  53         case KEY_ACTION_RELEASE:
  54                 switch(term->RawScancode)
  55                 {
  56                 case KEYSYM_LEFTALT:    gbVT_AltDown &= ~1;     break;
  57                 case KEYSYM_RIGHTALT:   gbVT_AltDown &= ~2;     break;
  58                 case KEYSYM_LEFTCTRL:   gbVT_CtrlDown &= ~1;    break;
  59                 case KEYSYM_RIGHTCTRL:  gbVT_CtrlDown &= ~2;    break;
  60                 }
  61                 break;
  62
  63         case KEY_ACTION_PRESS:
  64                 switch(term->RawScancode)
  65                 {
  66                 case KEYSYM_LEFTALT:    gbVT_AltDown |= 1;      break;
  67                 case KEYSYM_RIGHTALT:   gbVT_AltDown |= 2;      break;
  68                 case KEYSYM_LEFTCTRL:   gbVT_CtrlDown |= 1;     break;
  69                 case KEYSYM_RIGHTCTRL:  gbVT_CtrlDown |= 2;     break;
  70                 }
  71
  72                 // Check if the magic keys are held
  73                 if(!gbVT_AltDown || !gbVT_CtrlDown)
  74                         break;
  75
  76                 switch(term->RawScancode)
  77                 {
  78                 case KEYSYM_F1 :        VT_SetTerminal(0);      return;
  79                 case KEYSYM_F2 :        VT_SetTerminal(1);      return;
  80                 case KEYSYM_F3 :        VT_SetTerminal(2);      return;
  81                 case KEYSYM_F4 :        VT_SetTerminal(3);      return;
  82                 case KEYSYM_F5 :        VT_SetTerminal(4);      return;
  83                 case KEYSYM_F6 :        VT_SetTerminal(5);      return;
  84                 case KEYSYM_F7 :        VT_SetTerminal(6);      return;
  85                 case KEYSYM_F8 :        VT_SetTerminal(7);      return;
  86                 case KEYSYM_F9 :        VT_SetTerminal(8);      return;
  87                 case KEYSYM_F10:        VT_SetTerminal(9);      return;
  88                 case KEYSYM_F11:        VT_SetTerminal(10);     return;
  89                 case KEYSYM_F12:        VT_SetTerminal(11);     return;
  90                 }
  91
  92                 // Scrolling is only valid in text mode
  93                 if(term->Mode != TERM_MODE_TEXT)
  94                         break;
  95
  96 //              Log_Debug("VTerm", "Magic Ctrl-Alt-0x%x", term->RawScancode);
  97
  98                 switch(term->RawScancode)
  99                 {
 100                 // Scrolling
 101                 case KEYSYM_PGUP:
 102                         if( term->Flags & VT_FLAG_ALTBUF )
 103                                 return ;
 104                         term->ViewPos = MAX( 0, term->ViewPos - term->Width );
 105                         VT_int_UpdateScreen(term, 1);
 106                         return;
 107                 case KEYSYM_PGDN:
 108                         if( term->Flags & VT_FLAG_ALTBUF )
 109                                 return ;
 110                         term->ViewPos = MIN(
 111                                 term->ViewPos + term->Width,
 112                                 term->Width * term->Height * giVT_Scrollback
 113                                 );
 114                         VT_int_UpdateScreen(term, 1);
 115                         return;
 116                 }
 117                 break;
 118         }
 119
 120         // Encode key
 121         if(term->Mode == TERM_MODE_TEXT)
 122         {
 123                 Uint8   buf[6] = {0};
 124                  int    len = 0;
 125
 126                 // Ignore anything that isn't a press or refire
 127                 if( (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_PRESS
 128                  && (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_REFIRE
 129                     )
 130                 {
 131                         return ;
 132                 }
 133
 134                 Codepoint &= KEY_CODEPOINT_MASK;
 135
 136                 // Get UTF-8/ANSI Encoding
 137                 if( Codepoint == 0 )
 138                 {
 139                         // Non-printable keys
 140                         switch(term->RawScancode)
 141                         {
 142                         case KEYSYM_LEFTARROW:
 143                         case KEYSYM_KP4:
 144                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'D';
 145                                 len = 3;
 146                                 break;
 147                         case KEYSYM_RIGHTARROW:
 148                         case KEYSYM_KP6:
 149                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'C';
 150                                 len = 3;
 151                                 break;
 152                         case KEYSYM_UPARROW:
 153                         case KEYSYM_KP8:
 154                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'A';
 155                                 len = 3;
 156                                 break;
 157                         case KEYSYM_DOWNARROW:
 158                         case KEYSYM_KP2:
 159                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'B';
 160                                 len = 3;
 161                                 break;
 162
 163                         case KEYSYM_PGUP:
 164                         case KEYSYM_KP9:        // If Codepoint=0, It's page up
 165                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '5'; buf[3] = '~';
 166                                 len = 4;
 167                                 break;
 168                         case KEYSYM_PGDN:
 169                         case KEYSYM_KP3:        // If Codepoint=0, It's page down
 170                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '6'; buf[3] = '~';
 171                                 len = 4;
 172                                 break;
 173
 174                         case KEYSYM_HOME:
 175                         case KEYSYM_KP7:        // Codepoint==0, then it's home (not translated)
 176                                 buf[0] = '\x1B'; buf[1] = 'O'; buf[2] = 'H';
 177                                 len = 3;
 178                                 break;
 179                         case KEYSYM_END:
 180                         case KEYSYM_KP1:        // You get the drill
 181                                 buf[0] = '\x1B'; buf[1] = 'O'; buf[2] = 'F';
 182                                 len = 3;
 183                                 break;
 184
 185                         case KEYSYM_INSERT:
 186                         case KEYSYM_KP0:        // See above
 187                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '2'; buf[3] = '~';
 188                                 len = 4;
 189                                 break;
 190                         case KEYSYM_DELETE:
 191                         case KEYSYM_KPPERIOD:   // Are you that dumb? Look up
 192                                 buf[0] = '\x1B'; buf[1] = '['; buf[2] = '3'; buf[3] = '~';
 193                                 len = 4;
 194                                 break;
 195                         }
 196                 }
 197                 else if( gbVT_CtrlDown )
 198                 {
 199                         len = 1;
 200                         switch( term->RawScancode )
 201                         {
 202                         case KEYSYM_2:
 203                                 buf[0] = '\0';
 204                                 break;
 205                         case KEYSYM_3 ... KEYSYM_7:
 206                                 buf[0] = 0x1b + (term->RawScancode - KEYSYM_3);
 207                                 break;
 208                         case KEYSYM_8:
 209                                 buf[0] = 0x7f;
 210                                 break;
 211                         // - Ctrl-A = \1, Ctrl-Z = \x1a
 212                         case KEYSYM_a ... KEYSYM_z:
 213                                 buf[0] = 0x01 + (term->RawScancode - KEYSYM_a);
 214                                 break;
 215                         default:
 216                                 goto utf_encode;
 217                         }
 218                 }
 219                 else
 220                 {
 221                 utf_encode:
 222                         // Attempt to encode in UTF-8
 223                         len = WriteUTF8( buf, Codepoint );
 224                         if(len == 0) {
 225                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
 226                         }
 227                 }
 228
 229                 if(len == 0) {
 230                         // Unprintable / Don't Pass
 231                         return;
 232                 }
 233
 234                 // TODO: Implement Ctrl-C etc
 235 #if 0
 236                 // Handle meta characters
 237                 if( !(term->Flags & VT_FLAG_RAWIN) )
 238                 {
 239                         // Implementation options for Ctrl-C -> SIGINT
 240                         // - Kernel-land: here in the VT
 241                         //  > Pros: No userland change needed
 242                         //  > Cons: Requires process groups
 243                         // - User-land, in the shell
 244                         //  > Pros: Less threading changes
 245                         //  > Cons: Needs the shell to get all user input before the app, worse latency
 246                         //  >       Won't work with bash etc
 247                         switch(buf[0])
 248                         {
 249                         case '\3':      // ^C
 250
 251                                 break;
 252                         }
 253                 }
 254 #endif
 255
 256                 // Write
 257                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len ) {
 258                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
 259                 }
 260                 else {
 261                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
 262                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
 263                 }
 264                 // Roll the buffer over
 265                 term->InputWrite += len;
 266                 term->InputWrite %= MAX_INPUT_CHARS8;
 267                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
 268                         term->InputRead = term->InputWrite + 1;
 269                         term->InputRead %= MAX_INPUT_CHARS8;
 270                 }
 271         }
 272         else
 273         {
 274                 // Encode the raw key event
 275                 Uint32  *raw_in = (void*)term->InputBuffer;
 276
 277                 #if 0
 278                 // Drop new keys
 279                 if( term->InputWrite == term->InputRead )
 280                         return ;
 281                 #endif
 282
 283                 raw_in[ term->InputWrite ] = Codepoint;
 284                 term->InputWrite ++;
 285                 if(term->InputWrite >= MAX_INPUT_CHARS32)
 286                         term->InputWrite -= MAX_INPUT_CHARS32;
 287
 288                 #if 1
 289                 // TODO: Should old or new be dropped?
 290                 if(term->InputRead == term->InputWrite) {
 291                         term->InputRead ++;
 292                         if( term->InputRead >= MAX_INPUT_CHARS32 )
 293                                 term->InputRead -= MAX_INPUT_CHARS32;
 294                 }
 295                 #endif
 296         }
 297
 298         VFS_MarkAvaliable(&term->Node, 1);
 299 }
 300