Kernel/drv/vterm.c

   1 /*
   2  * Acess2 Virtual Terminal Driver
   3  */
   4 #define DEBUG   0
   5 #include <acess.h>
   6 #include <fs_devfs.h>
   7 #include <modules.h>
   8 #include <api_drv_video.h>
   9 #include <api_drv_keyboard.h>
  10 #include <api_drv_terminal.h>
  11 #include <errno.h>
  12 #include <semaphore.h>
  13
  14 // === CONSTANTS ===
  15 #define VERSION ((0<<8)|(50))
  16
  17 #define NUM_VTS 8
  18 #define MAX_INPUT_CHARS32       64
  19 #define MAX_INPUT_CHARS8        (MAX_INPUT_CHARS32*4)
  20 //#define DEFAULT_OUTPUT        "BochsGA"
  21 #define DEFAULT_OUTPUT  "Vesa"
  22 #define FALLBACK_OUTPUT "x86_VGAText"
  23 #define DEFAULT_INPUT   "PS2Keyboard"
  24 #define DEFAULT_WIDTH   640
  25 #define DEFAULT_HEIGHT  480
  26 #define DEFAULT_SCROLLBACK      2       // 2 Screens of text + current screen
  27 //#define DEFAULT_SCROLLBACK    0
  28 #define DEFAULT_COLOUR  (VT_COL_BLACK|(0xAAA<<16))
  29
  30 #define VT_FLAG_HIDECSR 0x01
  31 #define VT_FLAG_ALTBUF  0x02    //!< Alternate screen buffer
  32 #define VT_FLAG_RAWIN   0x04    //!< Don't handle ^Z/^C/^V
  33 #define VT_FLAG_HASFB   0x10    //!< Set if the VTerm has requested the Framebuffer
  34
  35 enum eVT_InModes {
  36         VT_INMODE_TEXT8,        // UTF-8 Text Mode (VT100/xterm Emulation)
  37         VT_INMODE_TEXT32,       // UTF-32 Text Mode (Acess Native)
  38         NUM_VT_INMODES
  39 };
  40
  41 // === TYPES ===
  42 typedef struct {
  43          int    Mode;   //!< Current Mode (see ::eTplTerminal_Modes)
  44          int    Flags;  //!< Flags (see VT_FLAG_*)
  45
  46         short   NewWidth;       //!< Un-applied dimensions (Width)
  47         short   NewHeight;      //!< Un-applied dimensions (Height)
  48         short   Width;  //!< Virtual Width
  49         short   Height; //!< Virtual Height
  50         short   TextWidth;      //!< Text Virtual Width
  51         short   TextHeight;     //!< Text Virtual Height
  52
  53         Uint32  CurColour;      //!< Current Text Colour
  54
  55          int    ViewPos;        //!< View Buffer Offset (Text Only)
  56          int    WritePos;       //!< Write Buffer Offset (Text Only)
  57         tVT_Char        *Text;
  58
  59         tVT_Char        *AltBuf;        //!< Alternate Screen Buffer
  60          int    AltWritePos;    //!< Alternate write position
  61         short   ScrollTop;      //!< Top of scrolling region (smallest)
  62         short   ScrollHeight;   //!< Length of scrolling region
  63
  64         tMutex  ReadingLock;    //!< Lock the VTerm when a process is reading from it
  65         tTID    ReadingThread;  //!< Owner of the lock
  66          int    InputRead;      //!< Input buffer read position
  67          int    InputWrite;     //!< Input buffer write position
  68         char    InputBuffer[MAX_INPUT_CHARS8];
  69 //      tSemaphore      InputSemaphore;
  70
  71         Uint32          *Buffer;
  72
  73         char    Name[2];        //!< Name of the terminal
  74         tVFS_Node       Node;
  75 } tVTerm;
  76
  77 // === IMPORTS ===
  78 extern void     Debug_SetKTerminal(const char *File);
  79
  80 // === PROTOTYPES ===
  81  int    VT_Install(char **Arguments);
  82 void    VT_InitOutput(void);
  83 void    VT_InitInput(void);
  84 char    *VT_ReadDir(tVFS_Node *Node, int Pos);
  85 tVFS_Node       *VT_FindDir(tVFS_Node *Node, const char *Name);
  86  int    VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data);
  87 Uint64  VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  88 Uint64  VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  89  int    VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data);
  90 void    VT_SetResolution(int Width, int Height);
  91 void    VT_SetMode(int Mode);
  92 void    VT_SetTerminal(int ID);
  93 void    VT_KBCallBack(Uint32 Codepoint);
  94 void    VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count);
  95 void    VT_int_ClearLine(tVTerm *Term, int Num);
  96  int    VT_int_ParseEscape(tVTerm *Term, char *Buffer);
  97 void    VT_int_PutChar(tVTerm *Term, Uint32 Ch);
  98 void    VT_int_ScrollText(tVTerm *Term, int Count);
  99 void    VT_int_ScrollFramebuffer( tVTerm *Term, int Count );
 100 void    VT_int_UpdateScreen( tVTerm *Term, int UpdateAll );
 101 void    VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight);
 102 void    VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled);
 103
 104 // === CONSTANTS ===
 105 const Uint16    caVT100Colours[] = {
 106                 // Black, Red, Green, Yellow, Blue, Purple, Cyan, Gray
 107                 // Same again, but bright
 108                 VT_COL_BLACK, 0x700, 0x070, 0x770, 0x007, 0x707, 0x077, 0xAAA,
 109                 VT_COL_GREY, 0xF00, 0x0F0, 0xFF0, 0x00F, 0xF0F, 0x0FF, VT_COL_WHITE
 110         };
 111
 112 // === GLOBALS ===
 113 MODULE_DEFINE(0, VERSION, VTerm, VT_Install, NULL, DEFAULT_INPUT, NULL);
 114 tDevFS_Driver   gVT_DrvInfo = {
 115         NULL, "VTerm",
 116         {
 117         .Flags = VFS_FFLAG_DIRECTORY,
 118         .Size = NUM_VTS,
 119         .Inode = -1,
 120         .NumACLs = 0,
 121         .ReadDir = VT_ReadDir,
 122         .FindDir = VT_FindDir,
 123         .IOCtl = VT_Root_IOCtl
 124         }
 125 };
 126 // --- Terminals ---
 127 tVTerm  gVT_Terminals[NUM_VTS];
 128  int    giVT_CurrentTerminal = 0;
 129 tVTerm  *gpVT_CurTerm = &gVT_Terminals[0];
 130 // --- Video State ---
 131 short   giVT_RealWidth  = DEFAULT_WIDTH;        //!< Screen Width
 132 short   giVT_RealHeight = DEFAULT_HEIGHT;       //!< Screen Height
 133  int    giVT_Scrollback = DEFAULT_SCROLLBACK;
 134 // --- Driver Handles ---
 135 char    *gsVT_OutputDevice = NULL;
 136 char    *gsVT_InputDevice = NULL;
 137  int    giVT_OutputDevHandle = -2;
 138  int    giVT_InputDevHandle = -2;
 139 // --- Key States --- (Used for VT Switching/Magic Combos)
 140  int    gbVT_CtrlDown = 0;
 141  int    gbVT_AltDown = 0;
 142  int    gbVT_SysrqDown = 0;
 143
 144 // === CODE ===
 145 /**
 146  * \fn int VT_Install(char **Arguments)
 147  * \brief Installs the Virtual Terminal Driver
 148  */
 149 int VT_Install(char **Arguments)
 150 {
 151          int    i;
 152
 153         // Scan Arguments
 154         if(Arguments)
 155         {
 156                 char    **args;
 157                 const char      *arg;
 158                 for(args = Arguments; (arg = *args); args++ )
 159                 {
 160                         char    data[strlen(arg)+1];
 161                         char    *opt = data;
 162                         char    *val;
 163
 164                         val = strchr(arg, '=');
 165                         strcpy(data, arg);
 166                         if( val ) {
 167                                 data[ val - arg ] = '\0';
 168                                 val ++;
 169                         }
 170                         Log_Debug("VTerm", "Argument '%s'", arg);
 171
 172                         if( strcmp(opt, "Video") == 0 ) {
 173                                 if( !gsVT_OutputDevice )
 174                                         gsVT_OutputDevice = strdup(val);
 175                         }
 176                         else if( strcmp(opt, "Input") == 0 ) {
 177                                 if( !gsVT_InputDevice )
 178                                         gsVT_InputDevice = strdup(val);
 179                         }
 180                         else if( strcmp(opt, "Width") == 0 ) {
 181                                 giVT_RealWidth = atoi( val );
 182                         }
 183                         else if( strcmp(opt, "Height") == 0 ) {
 184                                 giVT_RealHeight = atoi( val );
 185                         }
 186                         else if( strcmp(opt, "Scrollback") == 0 ) {
 187                                 giVT_Scrollback = atoi( val );
 188                         }
 189                 }
 190         }
 191
 192         // Apply Defaults
 193         if(!gsVT_OutputDevice)  gsVT_OutputDevice = (char*)DEFAULT_OUTPUT;
 194         else if( Module_EnsureLoaded( gsVT_OutputDevice ) )     gsVT_OutputDevice = (char*)DEFAULT_OUTPUT;
 195         if( Module_EnsureLoaded( gsVT_OutputDevice ) )  gsVT_OutputDevice = (char*)FALLBACK_OUTPUT;
 196         if( Module_EnsureLoaded( gsVT_OutputDevice ) ) {
 197                 Log_Error("VTerm", "Fallback video '%s' is not avaliable, giving up", FALLBACK_OUTPUT);
 198                 return MODULE_ERR_MISC;
 199         }
 200
 201         if(!gsVT_InputDevice)   gsVT_InputDevice = (char*)DEFAULT_INPUT;
 202         else if( Module_EnsureLoaded( gsVT_InputDevice ) )      gsVT_InputDevice = (char*)DEFAULT_INPUT;
 203
 204         // Create device paths
 205         {
 206                 char    *tmp;
 207                 tmp = malloc( 9 + strlen(gsVT_OutputDevice) + 1 );
 208                 strcpy(tmp, "/Devices/");
 209                 strcpy(&tmp[9], gsVT_OutputDevice);
 210                 gsVT_OutputDevice = tmp;
 211
 212                 tmp = malloc( 9 + strlen(gsVT_InputDevice) + 1 );
 213                 strcpy(tmp, "/Devices/");
 214                 strcpy(&tmp[9], gsVT_InputDevice);
 215                 gsVT_InputDevice = tmp;
 216         }
 217
 218         Log_Log("VTerm", "Using '%s' as output", gsVT_OutputDevice);
 219         Log_Log("VTerm", "Using '%s' as input", gsVT_InputDevice);
 220
 221         VT_InitOutput();
 222         VT_InitInput();
 223
 224         // Create Nodes
 225         for( i = 0; i < NUM_VTS; i++ )
 226         {
 227                 gVT_Terminals[i].Mode = TERM_MODE_TEXT;
 228                 gVT_Terminals[i].Flags = 0;
 229                 gVT_Terminals[i].CurColour = DEFAULT_COLOUR;
 230                 gVT_Terminals[i].WritePos = 0;
 231                 gVT_Terminals[i].AltWritePos = 0;
 232                 gVT_Terminals[i].ViewPos = 0;
 233                 gVT_Terminals[i].ReadingThread = -1;
 234                 gVT_Terminals[i].ScrollHeight = 0;
 235
 236                 // Initialise
 237                 VT_int_ChangeMode( &gVT_Terminals[i],
 238                         TERM_MODE_TEXT, giVT_RealWidth, giVT_RealHeight );
 239
 240                 gVT_Terminals[i].Name[0] = '0'+i;
 241                 gVT_Terminals[i].Name[1] = '\0';
 242                 gVT_Terminals[i].Node.Inode = i;
 243                 gVT_Terminals[i].Node.ImplPtr = &gVT_Terminals[i];
 244                 gVT_Terminals[i].Node.NumACLs = 0;      // Only root can open virtual terminals
 245
 246                 gVT_Terminals[i].Node.Read = VT_Read;
 247                 gVT_Terminals[i].Node.Write = VT_Write;
 248                 gVT_Terminals[i].Node.IOCtl = VT_Terminal_IOCtl;
 249 //              Semaphore_Init(&gVT_Terminals[i].InputSemaphore, 0, MAX_INPUT_CHARS8, "VTerm", gVT_Terminals[i].Name);
 250         }
 251
 252         // Add to DevFS
 253         DevFS_AddDevice( &gVT_DrvInfo );
 254
 255         // Set kernel output to VT0
 256         Debug_SetKTerminal("/Devices/VTerm/0");
 257
 258         return MODULE_ERR_OK;
 259 }
 260
 261 /**
 262  * \fn void VT_InitOutput()
 263  * \brief Initialise Video Output
 264  */
 265 void VT_InitOutput()
 266 {
 267         giVT_OutputDevHandle = VFS_Open(gsVT_OutputDevice, VFS_OPENFLAG_WRITE);
 268         if(giVT_OutputDevHandle == -1) {
 269                 Log_Warning("VTerm", "Oh F**k, I can't open the video device '%s'", gsVT_OutputDevice);
 270                 return ;
 271         }
 272         VT_SetResolution( giVT_RealWidth, giVT_RealHeight );
 273         VT_SetTerminal( 0 );
 274         VT_SetMode( VIDEO_BUFFMT_TEXT );
 275 }
 276
 277 /**
 278  * \fn void VT_InitInput()
 279  * \brief Initialises the input
 280  */
 281 void VT_InitInput()
 282 {
 283         giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
 284         if(giVT_InputDevHandle == -1) {
 285                 Log_Warning("VTerm", "Can't open the input device '%s'", gsVT_InputDevice);
 286                 return ;
 287         }
 288         VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
 289 }
 290
 291 /**
 292  * \brief Set the video resolution
 293  * \param Width New screen width
 294  * \param Height        New screen height
 295  */
 296 void VT_SetResolution(int Width, int Height)
 297 {
 298         tVideo_IOCtl_Mode       mode = {0};
 299          int    tmp;
 300          int    i;
 301
 302         // Create the video mode
 303         mode.width = Width;
 304         mode.height = Height;
 305         mode.bpp = 32;
 306         mode.flags = 0;
 307
 308         // Set video mode
 309         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_FINDMODE, &mode );
 310         tmp = mode.id;
 311         if( Width != mode.width || Height != mode.height )
 312         {
 313                 Log_Warning("VTerm",
 314                         "Selected resolution (%ix%i is not supported) by the device, using (%ix%i)",
 315                         giVT_RealWidth, giVT_RealHeight,
 316                         mode.width, mode.height
 317                         );
 318         }
 319         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_GETSETMODE, &tmp );
 320
 321         // Resize text terminals if needed
 322         if( gVT_Terminals[0].Text && (giVT_RealWidth != mode.width || giVT_RealHeight != mode.height) )
 323         {
 324                  int    newBufSize = (giVT_RealWidth/giVT_CharWidth)
 325                                         *(giVT_RealHeight/giVT_CharHeight)
 326                                         *(giVT_Scrollback+1);
 327                 //tVT_Char      *tmp;
 328                 // Resize the text terminals
 329                 giVT_RealWidth = mode.width;
 330                 giVT_RealHeight = mode.height;
 331                 Log_Debug("VTerm", "Resizing terminals to %ix%i",
 332                         giVT_RealWidth/giVT_CharWidth, giVT_RealHeight/giVT_CharHeight);
 333                 for( i = 0; i < NUM_VTS; i ++ )
 334                 {
 335                         if( gVT_Terminals[i].Mode != TERM_MODE_TEXT )   continue;
 336
 337                         gVT_Terminals[i].TextWidth = giVT_RealWidth/giVT_CharWidth;
 338                         gVT_Terminals[i].TextHeight = giVT_RealHeight/giVT_CharHeight;
 339                         gVT_Terminals[i].ScrollHeight = gVT_Terminals[i].TextHeight;
 340
 341                         gVT_Terminals[i].Text = realloc(
 342                                 gVT_Terminals[i].Text,
 343                                 newBufSize*sizeof(tVT_Char)
 344                                 );
 345                 }
 346         }
 347 }
 348
 349 /**
 350  * \brief Set video output buffer mode
 351  */
 352 void VT_SetMode(int Mode)
 353 {
 354         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &Mode );
 355 }
 356
 357 /**
 358  * \fn char *VT_ReadDir(tVFS_Node *Node, int Pos)
 359  * \brief Read from the VTerm Directory
 360  */
 361 char *VT_ReadDir(tVFS_Node *Node, int Pos)
 362 {
 363         if(Pos < 0)     return NULL;
 364         if(Pos >= NUM_VTS)      return NULL;
 365         return strdup( gVT_Terminals[Pos].Name );
 366 }
 367
 368 /**
 369  * \fn tVFS_Node *VT_FindDir(tVFS_Node *Node, const char *Name)
 370  * \brief Find an item in the VTerm directory
 371  * \param Node  Root node
 372  * \param Name  Name (number) of the terminal
 373  */
 374 tVFS_Node *VT_FindDir(tVFS_Node *Node, const char *Name)
 375 {
 376          int    num;
 377
 378         ENTER("pNode sName", Node, Name);
 379
 380         // Open the input and output files if needed
 381         if(giVT_OutputDevHandle == -2)  VT_InitOutput();
 382         if(giVT_InputDevHandle == -2)   VT_InitInput();
 383
 384         // Sanity check name
 385         if(Name[0] < '0' || Name[0] > '9' || Name[1] != '\0') {
 386                 LEAVE('n');
 387                 return NULL;
 388         }
 389         // Get index
 390         num = Name[0] - '0';
 391         if(num >= NUM_VTS) {
 392                 LEAVE('n');
 393                 return NULL;
 394         }
 395         // Return node
 396         LEAVE('p', &gVT_Terminals[num].Node);
 397         return &gVT_Terminals[num].Node;
 398 }
 399
 400 /**
 401  * \fn int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
 402  * \brief Control the VTerm Driver
 403  */
 404 int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
 405 {
 406          int    len;
 407         switch(Id)
 408         {
 409         case DRV_IOCTL_TYPE:    return DRV_TYPE_MISC;
 410         case DRV_IOCTL_IDENT:   memcpy(Data, "VT\0\0", 4);      return 0;
 411         case DRV_IOCTL_VERSION: return VERSION;
 412         case DRV_IOCTL_LOOKUP:  return 0;
 413
 414         case 4: // Get Video Driver
 415                 if(Data)        strcpy(Data, gsVT_OutputDevice);
 416                 return strlen(gsVT_OutputDevice);
 417
 418         case 5: // Set Video Driver
 419                 if(!Data)       return -EINVAL;
 420                 if(Threads_GetUID() != 0)       return -EACCES;
 421
 422                 len = strlen(Data);
 423
 424                 // TODO: Check if the string used is a heap string
 425
 426                 free(gsVT_OutputDevice);
 427
 428                 gsVT_OutputDevice = malloc(len+1);
 429                 strcpy(gsVT_OutputDevice, Data);
 430
 431                 VFS_Close(giVT_OutputDevHandle);
 432                 giVT_OutputDevHandle = -1;
 433
 434                 VT_InitOutput();
 435                 return 1;
 436         }
 437         return 0;
 438 }
 439
 440 /**
 441  * \brief Read from a virtual terminal
 442  */
 443 Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 444 {
 445          int    pos = 0;
 446          int    avail;
 447         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 448         Uint32  *codepoint_buf = Buffer;
 449         Uint32  *codepoint_in;
 450
 451         Mutex_Acquire( &term->ReadingLock );
 452
 453         // Check current mode
 454         switch(term->Mode)
 455         {
 456         // Text Mode (UTF-8)
 457         case TERM_MODE_TEXT:
 458                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UTF-8)");
 459
 460                 avail = term->InputWrite - term->InputRead;
 461                 if(avail < 0)
 462                         avail += MAX_INPUT_CHARS8;
 463                 if(avail > Length - pos)
 464                         avail = Length - pos;
 465
 466                 while( avail -- )
 467                 {
 468                         ((char*)Buffer)[pos] = term->InputBuffer[term->InputRead];
 469                         pos ++;
 470                         term->InputRead ++;
 471                         while(term->InputRead > MAX_INPUT_CHARS8)
 472                                 term->InputRead -= MAX_INPUT_CHARS8;
 473                 }
 474                 break;
 475
 476         //case TERM_MODE_FB:
 477         // Other - UCS-4
 478         default:
 479                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UCS-4)");
 480
 481                 avail = term->InputWrite - term->InputRead;
 482                 if(avail < 0)
 483                         avail += MAX_INPUT_CHARS32;
 484                 if(avail > Length - pos)
 485                         avail = Length/4 - pos;
 486
 487                 codepoint_in = (void*)term->InputBuffer;
 488                 codepoint_buf = Buffer;
 489
 490                 while( avail -- )
 491                 {
 492                         codepoint_buf[pos] = codepoint_in[term->InputRead];
 493                         pos ++;
 494                         term->InputRead ++;
 495                         while(term->InputRead > MAX_INPUT_CHARS32)
 496                                 term->InputRead -= MAX_INPUT_CHARS32;
 497                 }
 498                 pos *= 4;
 499                 break;
 500         }
 501
 502         // Mark none avaliable if buffer empty
 503         if( term->InputRead == term->InputWrite )
 504                 VFS_MarkAvaliable(&term->Node, 0);
 505
 506         term->ReadingThread = -1;
 507
 508         Mutex_Release( &term->ReadingLock );
 509
 510         return pos;
 511 }
 512
 513 /**
 514  * \fn Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 515  * \brief Write to a virtual terminal
 516  */
 517 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 518 {
 519         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 520          int    size;
 521
 522         // Write
 523         switch( term->Mode )
 524         {
 525         // Print Text
 526         case TERM_MODE_TEXT:
 527                 VT_int_PutString(term, Buffer, Length);
 528                 break;
 529         // Framebuffer :)
 530         case TERM_MODE_FB:
 531
 532                 // - Sanity Checking
 533                 size = term->Width*term->Height*4;
 534                 if( Offset > size ) {
 535                         Log_Notice("VTerm", "VT_Write: Offset (0x%llx) > FBSize (0x%x)",
 536                                 Offset, size);
 537                         return 0;
 538                 }
 539                 if( Offset + Length > size ) {
 540                         Log_Notice("VTerm", "VT_Write: Offset+Length (0x%llx) > FBSize (0x%x)",
 541                                 Offset+Length, size);
 542                         Length = size - Offset;
 543                 }
 544
 545                 // Copy to the local cache
 546                 memcpy( (void*)((Uint)term->Buffer + (Uint)Offset), Buffer, Length );
 547
 548                 // Update screen if needed
 549                 if( Node->Inode == giVT_CurrentTerminal )
 550                 {
 551                         // Fill entire screen?
 552                         if( giVT_RealWidth > term->Width || giVT_RealHeight > term->Height )
 553                         {
 554                                 // No? :( Well, just center it
 555                                  int    x, y, w, h;
 556                                 x = Offset/4;   y = x / term->Width;    x %= term->Width;
 557                                 w = Length/4+x; h = w / term->Width;    w %= term->Width;
 558                                 // Center
 559                                 x += (giVT_RealWidth - term->Width) / 2;
 560                                 y += (giVT_RealHeight - term->Height) / 2;
 561                                 while(h--)
 562                                 {
 563                                         VFS_WriteAt( giVT_OutputDevHandle,
 564                                                 (x + y * giVT_RealWidth)*4,
 565                                                 term->Width * 4,
 566                                                 Buffer
 567                                                 );
 568                                         Buffer = (void*)( (Uint)Buffer + term->Width*4 );
 569                                         y ++;
 570                                 }
 571                                 return 0;
 572                         }
 573                         else {
 574                                 return VFS_WriteAt( giVT_OutputDevHandle, Offset, Length, Buffer );
 575                         }
 576                 }
 577         // Just pass on (for now)
 578         // TODO: Handle locally too to ensure no information is lost on
 579         //       VT Switch (and to isolate terminals from each other)
 580         case TERM_MODE_2DACCEL:
 581         //case TERM_MODE_3DACCEL:
 582                 if( Node->Inode == giVT_CurrentTerminal )
 583                 {
 584                         VFS_Write( giVT_OutputDevHandle, Length, Buffer );
 585                 }
 586                 break;
 587         }
 588
 589         return 0;
 590 }
 591
 592 /**
 593  * \fn int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 594  * \brief Call an IO Control on a virtual terminal
 595  */
 596 int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 597 {
 598          int    *iData = Data;
 599          int    ret;
 600         tVTerm  *term = Node->ImplPtr;
 601         ENTER("pNode iId pData", Node, Id, Data);
 602
 603         if(Id >= DRV_IOCTL_LOOKUP) {
 604                 // Only root can fiddle with graphics modes
 605                 // TODO: Remove this and replace with user ownership
 606                 if( Threads_GetUID() != 0 )     return -1;
 607         }
 608
 609         switch(Id)
 610         {
 611         // --- Core Defined
 612         case DRV_IOCTL_TYPE:
 613                 LEAVE('i', DRV_TYPE_TERMINAL);
 614                 return DRV_TYPE_TERMINAL;
 615         case DRV_IOCTL_IDENT:
 616                 memcpy(Data, "VT\0\0", 4);
 617                 LEAVE('i', 0);
 618                 return 0;
 619         case DRV_IOCTL_VERSION:
 620                 LEAVE('x', VERSION);
 621                 return VERSION;
 622         case DRV_IOCTL_LOOKUP:
 623                 LEAVE('i', 0);
 624                 return 0;
 625
 626         // Get/Set the mode (and apply any changes)
 627         case TERM_IOCTL_MODETYPE:
 628                 if(Data != NULL)
 629                 {
 630                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 631                                 LEAVE('i', -1);
 632                                 return -1;
 633                         }
 634                         Log_Log("VTerm", "VTerm %i mode set to %i", (int)Node->Inode, *iData);
 635
 636                         // Update mode if needed
 637                         if( term->Mode != *iData
 638                          || term->NewWidth
 639                          || term->NewHeight)
 640                         {
 641                                 // Adjust for text mode
 642                                 if( *iData == TERM_MODE_TEXT ) {
 643                                         term->NewHeight *= giVT_CharHeight;
 644                                         term->NewWidth *= giVT_CharWidth;
 645                                 }
 646                                 // Fill unchanged dimensions
 647                                 if(term->NewHeight == 0)        term->NewHeight = term->Height;
 648                                 if(term->NewWidth == 0) term->NewWidth = term->Width;
 649                                 // Set new mode
 650                                 VT_int_ChangeMode(term, *iData, term->NewWidth, term->NewHeight);
 651                                 // Clear unapplied dimensions
 652                                 term->NewWidth = 0;
 653                                 term->NewHeight = 0;
 654                         }
 655
 656                         // Update the screen dimensions
 657                         if(Node->Inode == giVT_CurrentTerminal)
 658                                 VT_SetTerminal( giVT_CurrentTerminal );
 659                 }
 660                 LEAVE('i', term->Mode);
 661                 return term->Mode;
 662
 663         // Get/set the terminal width
 664         case TERM_IOCTL_WIDTH:
 665                 if(Data != NULL) {
 666                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 667                                 LEAVE('i', -1);
 668                                 return -1;
 669                         }
 670                         term->NewWidth = *iData;
 671                 }
 672                 if( term->NewWidth )
 673                         ret = term->NewWidth;
 674                 else if( term->Mode == TERM_MODE_TEXT )
 675                         ret = term->TextWidth;
 676                 else
 677                         ret = term->Width;
 678                 LEAVE('i', ret);
 679                 return ret;
 680
 681         // Get/set the terminal height
 682         case TERM_IOCTL_HEIGHT:
 683                 if(Data != NULL) {
 684                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 685                                 LEAVE('i', -1);
 686                                 return -1;
 687                         }
 688                         term->NewHeight = *iData;
 689                 }
 690                 if( term->NewHeight )
 691                         ret = term->NewHeight;
 692                 else if( term->Mode == TERM_MODE_TEXT )
 693                         ret = term->TextHeight;
 694                 else
 695                         ret = term->Height;
 696                 LEAVE('i', ret);
 697                 return ret;
 698
 699         case TERM_IOCTL_FORCESHOW:
 700                 Log_Log("VTerm", "Thread %i forced VTerm %i to be shown",
 701                         Threads_GetTID(), (int)Node->Inode);
 702                 VT_SetTerminal( Node->Inode );
 703                 LEAVE('i', 1);
 704                 return 1;
 705
 706         case TERM_IOCTL_GETCURSOR:
 707                 ret = (term->Flags & VT_FLAG_ALTBUF) ? term->AltWritePos : term->WritePos-term->ViewPos;
 708                 LEAVE('i', ret);
 709                 return ret;
 710         }
 711         LEAVE('i', -1);
 712         return -1;
 713 }
 714
 715 /**
 716  * \fn void VT_SetTerminal(int ID)
 717  * \brief Set the current terminal
 718  */
 719 void VT_SetTerminal(int ID)
 720 {
 721         // Update current terminal ID
 722         Log_Log("VTerm", "Changed terminal from %i to %i", giVT_CurrentTerminal, ID);
 723         giVT_CurrentTerminal = ID;
 724         gpVT_CurTerm = &gVT_Terminals[ID];
 725
 726         // Update cursor
 727         if( gpVT_CurTerm->Text && gpVT_CurTerm->Mode == TERM_MODE_TEXT && !(gpVT_CurTerm->Flags & VT_FLAG_HIDECSR) )
 728         {
 729                 tVideo_IOCtl_Pos        pos;
 730                  int    offset = (gpVT_CurTerm->Flags & VT_FLAG_ALTBUF) ? gpVT_CurTerm->AltWritePos : gpVT_CurTerm->WritePos - gpVT_CurTerm->ViewPos;
 731                 pos.x = offset % gpVT_CurTerm->TextWidth;
 732                 pos.y = offset / gpVT_CurTerm->TextWidth;
 733                 if( 0 <= pos.y && pos.y < gpVT_CurTerm->TextHeight )
 734                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &pos);
 735         }
 736
 737         if( gpVT_CurTerm->Mode == TERM_MODE_TEXT )
 738                 VT_SetMode( VIDEO_BUFFMT_TEXT );
 739         else
 740                 VT_SetMode( VIDEO_BUFFMT_FRAMEBUFFER );
 741
 742         // Update the screen
 743         VT_int_UpdateScreen( &gVT_Terminals[ ID ], 1 );
 744 }
 745
 746 /**
 747  * \fn void VT_KBCallBack(Uint32 Codepoint)
 748  * \brief Called on keyboard interrupt
 749  * \param Codepoint     Pseudo-UTF32 character
 750  *
 751  * Handles a key press and sends the key code to the user's buffer.
 752  * If the code creates a kernel-magic sequence, it is not passed to the
 753  * user and is handled in-kernel.
 754  */
 755 void VT_KBCallBack(Uint32 Codepoint)
 756 {
 757         tVTerm  *term = gpVT_CurTerm;
 758
 759         // How the hell did we get a codepoint of zero?
 760         if(Codepoint == 0)      return;
 761
 762         // Key Up
 763         if( Codepoint & 0x80000000 )
 764         {
 765                 Codepoint &= 0x7FFFFFFF;
 766                 switch(Codepoint)
 767                 {
 768                 case KEY_LALT:  gbVT_AltDown &= ~1;     break;
 769                 case KEY_RALT:  gbVT_AltDown &= ~2;     break;
 770                 case KEY_LCTRL: gbVT_CtrlDown &= ~1;    break;
 771                 case KEY_RCTRL: gbVT_CtrlDown &= ~2;    break;
 772                 }
 773                 return;
 774         }
 775
 776         switch(Codepoint)
 777         {
 778         case KEY_LALT:  gbVT_AltDown |= 1;      break;
 779         case KEY_RALT:  gbVT_AltDown |= 2;      break;
 780         case KEY_LCTRL: gbVT_CtrlDown |= 1;     break;
 781         case KEY_RCTRL: gbVT_CtrlDown |= 2;     break;
 782
 783         default:
 784                 if(!gbVT_AltDown || !gbVT_CtrlDown)
 785                         break;
 786                 switch(Codepoint)
 787                 {
 788                 case KEY_F1:    VT_SetTerminal(0);      return;
 789                 case KEY_F2:    VT_SetTerminal(1);      return;
 790                 case KEY_F3:    VT_SetTerminal(2);      return;
 791                 case KEY_F4:    VT_SetTerminal(3);      return;
 792                 case KEY_F5:    VT_SetTerminal(4);      return;
 793                 case KEY_F6:    VT_SetTerminal(5);      return;
 794                 case KEY_F7:    VT_SetTerminal(6);      return;
 795                 case KEY_F8:    VT_SetTerminal(7);      return;
 796                 case KEY_F9:    VT_SetTerminal(8);      return;
 797                 case KEY_F10:   VT_SetTerminal(9);      return;
 798                 case KEY_F11:   VT_SetTerminal(10);     return;
 799                 case KEY_F12:   VT_SetTerminal(11);     return;
 800                 // Scrolling
 801                 case KEY_PGUP:
 802                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 803                                 return ;
 804                         if( gpVT_CurTerm->ViewPos > gpVT_CurTerm->Width )
 805                                 gpVT_CurTerm->ViewPos -= gpVT_CurTerm->Width;
 806                         else
 807                                 gpVT_CurTerm->ViewPos = 0;
 808                         return;
 809                 case KEY_PGDOWN:
 810                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 811                                 return ;
 812                         if( gpVT_CurTerm->ViewPos < gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback) )
 813                                 gpVT_CurTerm->ViewPos += gpVT_CurTerm->Width;
 814                         else
 815                                 gpVT_CurTerm->ViewPos = gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback);
 816                         return;
 817                 }
 818         }
 819
 820         // Encode key
 821         if(term->Mode == TERM_MODE_TEXT)
 822         {
 823                 Uint8   buf[6] = {0};
 824                  int    len = 0;
 825
 826                 // Ignore Modifer Keys
 827                 if(Codepoint > KEY_MODIFIERS)   return;
 828
 829                 // Get UTF-8/ANSI Encoding
 830                 switch(Codepoint)
 831                 {
 832                 case KEY_LEFT:
 833                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'D';
 834                         len = 3;
 835                         break;
 836                 case KEY_RIGHT:
 837                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'C';
 838                         len = 3;
 839                         break;
 840                 case KEY_UP:
 841                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'A';
 842                         len = 3;
 843                         break;
 844                 case KEY_DOWN:
 845                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'B';
 846                         len = 3;
 847                         break;
 848
 849                 case KEY_PGUP:
 850                         //buf[0] = '\x1B';      buf[1] = '[';   buf[2] = '5';   // Some overline also
 851                         //len = 4;      // Commented out until I'm sure
 852                         len = 0;
 853                         break;
 854                 case KEY_PGDOWN:
 855                         len = 0;
 856                         break;
 857
 858                 // Attempt to encode in UTF-8
 859                 default:
 860                         len = WriteUTF8( buf, Codepoint );
 861                         if(len == 0) {
 862                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
 863                         }
 864                         break;
 865                 }
 866
 867                 if(len == 0) {
 868                         // Unprintable / Don't Pass
 869                         return;
 870                 }
 871
 872 #if 0
 873                 // Handle meta characters
 874                 if( !(term->Flags & VT_FLAG_RAWIN) )
 875                 {
 876                         switch(buf[0])
 877                         {
 878                         case '\3':      // ^C
 879
 880                                 break;
 881                         }
 882                 }
 883 #endif
 884
 885                 // Write
 886                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
 887                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
 888                 else {
 889                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
 890                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
 891                 }
 892                 // Roll the buffer over
 893                 term->InputWrite += len;
 894                 term->InputWrite %= MAX_INPUT_CHARS8;
 895                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
 896                         term->InputRead = term->InputWrite + 1;
 897                         term->InputRead %= MAX_INPUT_CHARS8;
 898                 }
 899         }
 900         else
 901         {
 902                 // Encode the raw UTF-32 Key
 903                 Uint32  *raw_in = (void*)term->InputBuffer;
 904                 raw_in[ term->InputWrite ] = Codepoint;
 905                 term->InputWrite ++;
 906                 term->InputWrite %= MAX_INPUT_CHARS32;
 907                 if(term->InputRead == term->InputWrite) {
 908                         term->InputRead ++;
 909                         term->InputRead %= MAX_INPUT_CHARS32;
 910                 }
 911         }
 912
 913         VFS_MarkAvaliable(&term->Node, 1);
 914 }
 915
 916 /**
 917  * \fn void VT_int_ClearLine(tVTerm *Term, int Num)
 918  * \brief Clears a line in a virtual terminal
 919  */
 920 void VT_int_ClearLine(tVTerm *Term, int Num)
 921 {
 922          int    i;
 923         tVT_Char        *cell;
 924
 925         if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )        return ;
 926
 927         cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
 928         cell = &cell[ Num*Term->TextWidth ];
 929
 930         for( i = Term->TextWidth; i--; )
 931         {
 932                 cell[ i ].Ch = 0;
 933                 cell[ i ].Colour = Term->CurColour;
 934         }
 935 }
 936
 937 /**
 938  * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
 939  * \brief Parses a VT100 Escape code
 940  */
 941 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
 942 {
 943         char    c;
 944          int    argc = 0, j = 1;
 945          int    tmp;
 946          int    args[6] = {0,0,0,0};
 947          int    bQuestionMark = 0;
 948
 949         switch(Buffer[0])
 950         {
 951         //Large Code
 952         case '[':
 953                 // Get Arguments
 954                 c = Buffer[j++];
 955                 if(c == '?') {
 956                         bQuestionMark = 1;
 957                         c = Buffer[j++];
 958                 }
 959                 if( '0' <= c && c <= '9' )
 960                 {
 961                         do {
 962                                 if(c == ';')    c = Buffer[j++];
 963                                 while('0' <= c && c <= '9') {
 964                                         args[argc] *= 10;
 965                                         args[argc] += c-'0';
 966                                         c = Buffer[j++];
 967                                 }
 968                                 argc ++;
 969                         } while(c == ';');
 970                 }
 971
 972                 // Get Command
 973                 if( ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
 974                 {
 975                         if( bQuestionMark )
 976                         {
 977                                 switch(c)
 978                                 {
 979                                 // DEC Private Mode Set
 980                                 case 'h':
 981                                         if(argc != 1)   break;
 982                                         switch(args[0])
 983                                         {
 984                                         case 1047:
 985                                                 VT_int_ToggleAltBuffer(Term, 1);
 986                                                 break;
 987                                         }
 988                                         break;
 989                                 case 'l':
 990                                         if(argc != 1)   break;
 991                                         switch(args[0])
 992                                         {
 993                                         case 1047:
 994                                                 VT_int_ToggleAltBuffer(Term, 0);
 995                                                 break;
 996                                         }
 997                                         break;
 998                                 default:
 999                                         Log_Warning("VTerm", "Unknown control sequence '\\x1B[?%c'", c);
1000                                         break;
1001                                 }
1002                         }
1003                         else
1004                         {
1005                                 tmp = 1;
1006                                 switch(c)
1007                                 {
1008                                 // Left
1009                                 case 'D':
1010                                         tmp = -1;
1011                                 // Right
1012                                 case 'C':
1013                                         if(argc == 1)   tmp *= args[0];
1014                                         if( Term->Flags & VT_FLAG_ALTBUF )
1015                                         {
1016                                                 if( (Term->AltWritePos + tmp) % Term->TextWidth == 0 ) {
1017                                                         Term->AltWritePos -= Term->AltWritePos % Term->TextWidth;
1018                                                         Term->AltWritePos += Term->TextWidth - 1;
1019                                                 }
1020                                                 else
1021                                                         Term->AltWritePos += tmp;
1022                                         }
1023                                         else
1024                                         {
1025                                                 if( (Term->WritePos + tmp) % Term->TextWidth == 0 ) {
1026                                                         Term->WritePos -= Term->WritePos % Term->TextWidth;
1027                                                         Term->WritePos += Term->TextWidth - 1;
1028                                                 }
1029                                                 else
1030                                                         Term->WritePos += tmp;
1031                                         }
1032                                         break;
1033
1034                                 // Erase
1035                                 case 'J':
1036                                         switch(args[0])
1037                                         {
1038                                         case 0: // Erase below
1039                                                 break;
1040                                         case 1: // Erase above
1041                                                 break;
1042                                         case 2: // Erase all
1043                                                 if( Term->Flags & VT_FLAG_ALTBUF )
1044                                                 {
1045                                                          int    i = Term->TextHeight;
1046                                                         while( i-- )    VT_int_ClearLine(Term, i);
1047                                                         Term->AltWritePos = 0;
1048                                                         VT_int_UpdateScreen(Term, 1);
1049                                                 }
1050                                                 else
1051                                                 {
1052                                                          int    i = Term->TextHeight * (giVT_Scrollback + 1);
1053                                                         while( i-- )    VT_int_ClearLine(Term, i);
1054                                                         Term->WritePos = 0;
1055                                                         Term->ViewPos = 0;
1056                                                         VT_int_UpdateScreen(Term, 1);
1057                                                 }
1058                                                 break;
1059                                         }
1060                                         break;
1061
1062                                 // Erase in line
1063                                 case 'K':
1064                                         switch(args[0])
1065                                         {
1066                                         case 0: // Erase to right
1067                                                 if( Term->Flags & VT_FLAG_ALTBUF )
1068                                                 {
1069                                                          int    i, max;
1070                                                         max = Term->Width - Term->AltWritePos % Term->Width;
1071                                                         for( i = 0; i < max; i ++ )
1072                                                                 Term->AltBuf[Term->AltWritePos+i].Ch = 0;
1073                                                 }
1074                                                 else
1075                                                 {
1076                                                          int    i, max;
1077                                                         max = Term->Width - Term->WritePos % Term->Width;
1078                                                         for( i = 0; i < max; i ++ )
1079                                                                 Term->Text[Term->WritePos+i].Ch = 0;
1080                                                 }
1081                                                 VT_int_UpdateScreen(Term, 0);
1082                                                 break;
1083                                         case 1: // Erase to left
1084                                                 if( Term->Flags & VT_FLAG_ALTBUF )
1085                                                 {
1086                                                          int    i = Term->AltWritePos % Term->Width;
1087                                                         while( i -- )
1088                                                                 Term->AltBuf[Term->AltWritePos++].Ch = 0;
1089                                                 }
1090                                                 else
1091                                                 {
1092                                                          int    i = Term->WritePos % Term->Width;
1093                                                         while( i -- )
1094                                                                 Term->Text[Term->WritePos++].Ch = 0;
1095                                                 }
1096                                                 VT_int_UpdateScreen(Term, 0);
1097                                                 break;
1098                                         case 2: // Erase all
1099                                                 if( Term->Flags & VT_FLAG_ALTBUF )
1100                                                 {
1101                                                         VT_int_ClearLine(Term, Term->AltWritePos / Term->Width);
1102                                                 }
1103                                                 else
1104                                                 {
1105                                                         VT_int_ClearLine(Term, Term->WritePos / Term->Width);
1106                                                 }
1107                                                 VT_int_UpdateScreen(Term, 0);
1108                                                 break;
1109                                         }
1110                                         break;
1111
1112                                 // Set cursor position
1113                                 case 'H':
1114                                         if( Term->Flags & VT_FLAG_ALTBUF )
1115                                                 Term->AltWritePos = args[0] + args[1]*Term->TextWidth;
1116                                         else
1117                                                 Term->WritePos = args[0] + args[1]*Term->TextWidth;
1118                                         //Log_Debug("VTerm", "args = {%i, %i}", args[0], args[1]);
1119                                         break;
1120
1121                                 // Scroll up `n` lines
1122                                 case 'S':
1123                                         tmp = -1;
1124                                 // Scroll down `n` lines
1125                                 case 'T':
1126                                         if(argc == 1)   tmp *= args[0];
1127                                         if( Term->Flags & VT_FLAG_ALTBUF )
1128                                                 VT_int_ScrollText(Term, tmp);
1129                                         else
1130                                         {
1131                                                 if(Term->ViewPos/Term->TextWidth + tmp < 0)
1132                                                         break;
1133                                                 if(Term->ViewPos/Term->TextWidth + tmp  > Term->TextHeight * (giVT_Scrollback + 1))
1134                                                         break;
1135
1136                                                 Term->ViewPos += Term->TextWidth*tmp;
1137                                         }
1138                                         break;
1139
1140                                 // Set Font flags
1141                                 case 'm':
1142                                         for( ; argc--; )
1143                                         {
1144                                                 // Flags
1145                                                 if( 0 <= args[argc] && args[argc] <= 8)
1146                                                 {
1147                                                         switch(args[argc])
1148                                                         {
1149                                                         case 0: Term->CurColour = DEFAULT_COLOUR;       break;  // Reset
1150                                                         case 1: Term->CurColour |= 0x80000000;  break;  // Bright
1151                                                         case 2: Term->CurColour &= ~0x80000000; break;  // Dim
1152                                                         }
1153                                                 }
1154                                                 // Foreground Colour
1155                                                 else if(30 <= args[argc] && args[argc] <= 37) {
1156                                                         Term->CurColour &= 0xF000FFFF;
1157                                                         Term->CurColour |= (Uint32)caVT100Colours[ args[argc]-30+(Term->CurColour>>28) ] << 16;
1158                                                 }
1159                                                 // Background Colour
1160                                                 else if(40 <= args[argc] && args[argc] <= 47) {
1161                                                         Term->CurColour &= 0xFFFF8000;
1162                                                         Term->CurColour |= caVT100Colours[ args[argc]-40+((Term->CurColour>>12)&15) ];
1163                                                 }
1164                                         }
1165                                         break;
1166
1167                                 // Set scrolling region
1168                                 case 'r':
1169                                         if( argc != 2 ) break;
1170                                         Term->ScrollTop = args[0];
1171                                         Term->ScrollHeight = args[1] - args[0];
1172                                         break;
1173
1174                                 default:
1175                                         Log_Warning("VTerm", "Unknown control sequence '\\x1B[%c'", c);
1176                                         break;
1177                                 }
1178                         }
1179                 }
1180                 break;
1181
1182         default:        break;
1183         }
1184
1185         //Log_Debug("VTerm", "j = %i, Buffer = '%s'", j, Buffer);
1186         return j;
1187 }
1188
1189 /**
1190  * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1191  * \brief Print a string to the Virtual Terminal
1192  */
1193 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1194 {
1195         Uint32  val;
1196          int    i;
1197
1198         // Iterate
1199         for( i = 0; i < Count; i++ )
1200         {
1201                 // Handle escape sequences
1202                 if( Buffer[i] == 0x1B )
1203                 {
1204                         i ++;
1205                         i += VT_int_ParseEscape(Term, (char*)&Buffer[i]) - 1;
1206                         continue;
1207                 }
1208
1209                 // Fast check for non UTF-8
1210                 if( Buffer[i] < 128 )   // Plain ASCII
1211                         VT_int_PutChar(Term, Buffer[i]);
1212                 else {  // UTF-8
1213                         i += ReadUTF8(&Buffer[i], &val) - 1;
1214                         VT_int_PutChar(Term, val);
1215                 }
1216         }
1217         // Update Screen
1218         VT_int_UpdateScreen( Term, 0 );
1219
1220         // Update cursor
1221         if( Term == gpVT_CurTerm && !(Term->Flags & VT_FLAG_HIDECSR) )
1222         {
1223                 tVideo_IOCtl_Pos        pos;
1224                  int    offset = (gpVT_CurTerm->Flags & VT_FLAG_ALTBUF) ? gpVT_CurTerm->AltWritePos : gpVT_CurTerm->WritePos - gpVT_CurTerm->ViewPos;
1225                 pos.x = offset % gpVT_CurTerm->TextWidth;
1226                 pos.y = offset / gpVT_CurTerm->TextWidth;
1227                 if( 0 <= pos.y && pos.y < gpVT_CurTerm->TextHeight )
1228                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &pos);
1229         }
1230 }
1231
1232 /**
1233  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1234  * \brief Write a single character to a VTerm
1235  */
1236 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1237 {
1238          int    i;
1239         tVT_Char        *buffer;
1240          int    write_pos;
1241
1242         if(Term->Flags & VT_FLAG_ALTBUF) {
1243                 buffer = Term->AltBuf;
1244                 write_pos = Term->AltWritePos;
1245         }
1246         else {
1247                 buffer = Term->Text;
1248                 write_pos = Term->WritePos;
1249         }
1250
1251         switch(Ch)
1252         {
1253         case '\0':      return; // Ignore NULL byte
1254         case '\n':
1255                 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
1256                 write_pos += Term->TextWidth;
1257         case '\r':
1258                 write_pos -= write_pos % Term->TextWidth;
1259                 break;
1260
1261         case '\t': { int tmp = write_pos / Term->TextWidth;
1262                 write_pos %= Term->TextWidth;
1263                 do {
1264                         buffer[ write_pos ].Ch = '\0';
1265                         buffer[ write_pos ].Colour = Term->CurColour;
1266                         write_pos ++;
1267                 } while(write_pos & 7);
1268                 write_pos += tmp * Term->TextWidth;
1269                 break; }
1270
1271         case '\b':
1272                 // Backspace is invalid at Offset 0
1273                 if(write_pos == 0)      break;
1274
1275                 write_pos --;
1276                 // Singe Character
1277                 if(buffer[ write_pos ].Ch != '\0') {
1278                         buffer[ write_pos ].Ch = 0;
1279                         buffer[ write_pos ].Colour = Term->CurColour;
1280                         break;
1281                 }
1282                 // Tab
1283                 i = 7;  // Limit it to 8
1284                 do {
1285                         buffer[ write_pos ].Ch = 0;
1286                         buffer[ write_pos ].Colour = Term->CurColour;
1287                         write_pos --;
1288                 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
1289                 if(buffer[ write_pos ].Ch != '\0')
1290                         write_pos ++;
1291                 break;
1292
1293         default:
1294                 buffer[ write_pos ].Ch = Ch;
1295                 buffer[ write_pos ].Colour = Term->CurColour;
1296                 // Update the line before wrapping
1297                 if( (write_pos + 1) % Term->TextWidth == 0 )
1298                         VT_int_UpdateScreen( Term, 0 );
1299                 write_pos ++;
1300                 break;
1301         }
1302
1303         if(Term->Flags & VT_FLAG_ALTBUF)
1304         {
1305                 Term->AltBuf = buffer;
1306                 Term->AltWritePos = write_pos;
1307
1308                 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
1309                 {
1310                         Term->AltWritePos -= Term->TextWidth;
1311                         VT_int_ScrollText(Term, 1);
1312                 }
1313
1314         }
1315         else
1316         {
1317                 Term->Text = buffer;
1318                 Term->WritePos = write_pos;
1319                 // Move Screen
1320                 // - Check if we need to scroll the entire scrollback buffer
1321                 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
1322                 {
1323                          int    base;
1324
1325                         // Update previous line
1326                         Term->WritePos -= Term->TextWidth;
1327                         VT_int_UpdateScreen( Term, 0 );
1328
1329                         // Update view position
1330                         base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
1331                         if(Term->ViewPos < base)
1332                                 Term->ViewPos += Term->Width;
1333                         if(Term->ViewPos > base)
1334                                 Term->ViewPos = base;
1335
1336                         VT_int_ScrollText(Term, 1);
1337                 }
1338                 // Ok, so we only need to scroll the screen
1339                 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
1340                 {
1341                         // Update the last line
1342                         Term->WritePos -= Term->TextWidth;
1343                         VT_int_UpdateScreen( Term, 0 );
1344                         Term->WritePos += Term->TextWidth;
1345
1346                         VT_int_ScrollText(Term, 1);
1347
1348                         Term->ViewPos += Term->TextWidth;
1349                 }
1350         }
1351
1352         //LEAVE('-');
1353 }
1354
1355 void VT_int_ScrollText(tVTerm *Term, int Count)
1356 {
1357         tVT_Char        *buf;
1358          int    height, init_write_pos;
1359          int    len, i;
1360          int    scroll_top, scroll_height;
1361
1362         // Get buffer pointer and attributes
1363         if( Term->Flags & VT_FLAG_ALTBUF )
1364         {
1365                 buf = Term->AltBuf;
1366                 height = Term->TextHeight;
1367                 init_write_pos = Term->AltWritePos;
1368                 scroll_top = Term->ScrollTop;
1369                 scroll_height = Term->ScrollHeight;
1370         }
1371         else
1372         {
1373                 buf = Term->Text;
1374                 height = Term->TextHeight*(giVT_Scrollback+1);
1375                 init_write_pos = Term->WritePos;
1376                 scroll_top = 0;
1377                 scroll_height = height;
1378         }
1379
1380         // Scroll text downwards
1381         if( Count > 0 )
1382         {
1383                  int    base;
1384
1385                 // Set up
1386                 if(Count > scroll_height)       Count = scroll_height;
1387                 base = Term->TextWidth*(scroll_top + scroll_height - Count);
1388                 len = Term->TextWidth*(scroll_height - Count);
1389
1390                 // Scroll terminal cache
1391                 memmove(
1392                         &buf[Term->TextWidth*scroll_top],
1393                         &buf[Term->TextWidth*(scroll_top+Count)],
1394                         len*sizeof(tVT_Char)
1395                         );
1396                 // Clear last rows
1397                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1398                 {
1399                         buf[ base + i ].Ch = 0;
1400                         buf[ base + i ].Colour = Term->CurColour;
1401                 }
1402
1403                 // Update Screen
1404                 VT_int_ScrollFramebuffer( Term, Count );
1405                 if( Term->Flags & VT_FLAG_ALTBUF )
1406                         Term->AltWritePos = base;
1407                 else
1408                         Term->WritePos = Term->ViewPos + Term->TextWidth*(Term->TextHeight - Count);
1409                 for( i = 0; i < Count; i ++ )
1410                 {
1411                         VT_int_UpdateScreen( Term, 0 );
1412                         if( Term->Flags & VT_FLAG_ALTBUF )
1413                                 Term->AltWritePos += Term->TextWidth;
1414                         else
1415                                 Term->WritePos += Term->TextWidth;
1416                 }
1417         }
1418         else
1419         {
1420                 Count = -Count;
1421                 if(Count > scroll_height)       Count = scroll_height;
1422
1423                 len = Term->TextWidth*(scroll_height - Count);
1424
1425                 // Scroll terminal cache
1426                 memmove(
1427                         &buf[Term->TextWidth*(scroll_top+Count)],
1428                         &buf[Term->TextWidth*scroll_top],
1429                         len*sizeof(tVT_Char)
1430                         );
1431                 // Clear preceding rows
1432                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1433                 {
1434                         buf[ i ].Ch = 0;
1435                         buf[ i ].Colour = Term->CurColour;
1436                 }
1437
1438                 VT_int_ScrollFramebuffer( Term, -Count );
1439                 if( Term->Flags & VT_FLAG_ALTBUF )
1440                         Term->AltWritePos = Term->TextWidth*scroll_top;
1441                 else
1442                         Term->WritePos = Term->ViewPos;
1443                 for( i = 0; i < Count; i ++ )
1444                 {
1445                         VT_int_UpdateScreen( Term, 0 );
1446                         if( Term->Flags & VT_FLAG_ALTBUF )
1447                                 Term->AltWritePos += Term->TextWidth;
1448                         else
1449                                 Term->WritePos += Term->TextWidth;
1450                 }
1451         }
1452
1453         if( Term->Flags & VT_FLAG_ALTBUF )
1454                 Term->AltWritePos = init_write_pos;
1455         else
1456                 Term->WritePos = init_write_pos;
1457 }
1458
1459 /**
1460  * \fn void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1461  * \note Scrolls the framebuffer down by \a Count text lines
1462  */
1463 void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1464 {
1465          int    tmp;
1466         struct {
1467                 Uint8   Op;
1468                 Uint16  DstX, DstY;
1469                 Uint16  SrcX, SrcY;
1470                 Uint16  W, H;
1471         } PACKED        buf;
1472
1473         // Only update if this is the current terminal
1474         if( Term != gpVT_CurTerm )      return;
1475
1476         if( Count > Term->ScrollHeight )        Count = Term->ScrollHeight;
1477         if( Count < -Term->ScrollHeight )       Count = -Term->ScrollHeight;
1478
1479         // Switch to 2D Command Stream
1480         tmp = VIDEO_BUFFMT_2DSTREAM;
1481         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1482
1483         // BLIT to 0,0 from 0,giVT_CharHeight
1484         buf.Op = VIDEO_2DOP_BLIT;
1485         buf.SrcX = 0;   buf.DstX = 0;
1486         // TODO: Don't assume character dimensions
1487         buf.W = Term->TextWidth * giVT_CharWidth;
1488         if( Count > 0 )
1489         {
1490                 buf.SrcY = (Term->ScrollTop+Count) * giVT_CharHeight;
1491                 buf.DstY = Term->ScrollTop * giVT_CharHeight;
1492         }
1493         else    // Scroll up, move text down
1494         {
1495                 Count = -Count;
1496                 buf.SrcY = Term->ScrollTop * giVT_CharHeight;
1497                 buf.DstY = (Term->ScrollTop+Count) * giVT_CharHeight;
1498         }
1499         buf.H = (Term->ScrollHeight-Count) * giVT_CharHeight;
1500         VFS_WriteAt(giVT_OutputDevHandle, 0, sizeof(buf), &buf);
1501
1502         // Restore old mode (this function is only called during text mode)
1503         tmp = VIDEO_BUFFMT_TEXT;
1504         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1505 }
1506
1507 /**
1508  * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1509  * \brief Updates the video framebuffer
1510  */
1511 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1512 {
1513         tVT_Char        *buffer;
1514          int    view_pos, write_pos;
1515         // Only update if this is the current terminal
1516         if( Term != gpVT_CurTerm )      return;
1517
1518         switch( Term->Mode )
1519         {
1520         case TERM_MODE_TEXT:
1521                 view_pos = (Term->Flags & VT_FLAG_ALTBUF) ? 0 : Term->ViewPos;
1522                 write_pos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
1523                 buffer = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1524                 // Re copy the entire screen?
1525                 if(UpdateAll) {
1526                         VFS_WriteAt(
1527                                 giVT_OutputDevHandle,
1528                                 0,
1529                                 Term->TextWidth*Term->TextHeight*sizeof(tVT_Char),
1530                                 &buffer[view_pos]
1531                                 );
1532                 }
1533                 // Only copy the current line
1534                 else {
1535                          int    ofs = write_pos - write_pos % Term->TextWidth;
1536                         VFS_WriteAt(
1537                                 giVT_OutputDevHandle,
1538                                 (ofs - view_pos)*sizeof(tVT_Char),
1539                                 Term->TextWidth*sizeof(tVT_Char),
1540                                 &buffer[ofs]
1541                                 );
1542                 }
1543                 break;
1544         case TERM_MODE_FB:
1545                 VFS_WriteAt(
1546                         giVT_OutputDevHandle,
1547                         0,
1548                         Term->Width*Term->Height*sizeof(Uint32),
1549                         Term->Buffer
1550                         );
1551                 break;
1552         }
1553 }
1554
1555 /**
1556  * \brief Update the screen mode
1557  * \param Term  Terminal to update
1558  * \param NewMode       New mode to set
1559  * \param NewWidth      New framebuffer width
1560  * \param NewHeight     New framebuffer height
1561  */
1562 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
1563 {
1564         // TODO: Increase RealWidth/RealHeight when this happens
1565         if(NewWidth > giVT_RealWidth)   NewWidth = giVT_RealWidth;
1566         if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
1567
1568         Term->Mode = NewMode;
1569
1570         if(NewWidth != Term->Width || NewHeight != Term->Height)
1571         {
1572                  int    oldW = Term->Width;
1573                  int    oldTW = Term->TextWidth;
1574                  int    oldH = Term->Height;
1575                  int    oldTH = Term->TextHeight;
1576                 tVT_Char        *oldTBuf = Term->Text;
1577                 Uint32  *oldFB = Term->Buffer;
1578                  int    w, h, i;
1579                 // Calculate new dimensions
1580                 Term->Width = NewWidth;
1581                 Term->Height = NewHeight;
1582                 Term->TextWidth = NewWidth / giVT_CharWidth;
1583                 Term->TextHeight = NewHeight / giVT_CharHeight;
1584                 Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
1585
1586                 // Allocate new buffers
1587                 // - Text
1588                 Term->Text = calloc(
1589                         Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
1590                         sizeof(tVT_Char)
1591                         );
1592                 if(oldTBuf) {
1593                         // Copy old buffer
1594                         w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
1595                         h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
1596                         h *= giVT_Scrollback + 1;
1597                         for( i = 0; i < h; i ++ )
1598                         {
1599                                 memcpy(
1600                                         &Term->Text[i*Term->TextWidth],
1601                                         &oldTBuf[i*oldTW],
1602                                         w*sizeof(tVT_Char)
1603                                         );
1604                         }
1605                         free(oldTBuf);
1606                 }
1607
1608                 // - Alternate Text
1609                 Term->AltBuf = realloc(
1610                         Term->AltBuf,
1611                         Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
1612                         );
1613
1614                 // - Framebuffer
1615                 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
1616                 if(oldFB) {
1617                         // Copy old buffer
1618                         w = (oldW > Term->Width) ? Term->Width : oldW;
1619                         h = (oldH > Term->Height) ? Term->Height : oldH;
1620                         for( i = 0; i < h; i ++ )
1621                         {
1622                                 memcpy(
1623                                         &Term->Buffer[i*Term->Width],
1624                                         &oldFB[i*oldW],
1625                                         w*sizeof(Uint32)
1626                                         );
1627                         }
1628                         free(oldFB);
1629                 }
1630
1631                 // Debug
1632                 switch(NewMode)
1633                 {
1634                 case TERM_MODE_TEXT:
1635                         Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
1636                                 Term, Term->TextWidth, Term->TextHeight);
1637                         break;
1638                 case TERM_MODE_FB:
1639                         Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
1640                                 Term, Term->Width, Term->Height);
1641                         break;
1642                 //case TERM_MODE_2DACCEL:
1643                 //case TERM_MODE_3DACCEL:
1644                 //      return;
1645                 }
1646         }
1647
1648 }
1649
1650
1651 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
1652 {
1653         if(Enabled)
1654                 Term->Flags |= VT_FLAG_ALTBUF;
1655         else
1656                 Term->Flags &= ~VT_FLAG_ALTBUF;
1657         VT_int_UpdateScreen(Term, 1);
1658 }
1659
1660 // ---
1661 // Font Render
1662 // ---
1663 #define MONOSPACE_FONT  10816
1664
1665 #if MONOSPACE_FONT == 10808     // 8x8
1666 # include "vterm_font_8x8.h"
1667 #elif MONOSPACE_FONT == 10816   // 8x16
1668 # include "vterm_font_8x16.h"
1669 #endif
1670
1671 // === PROTOTYPES ===
1672 Uint8   *VT_Font_GetChar(Uint32 Codepoint);
1673
1674 // === GLOBALS ===
1675 int     giVT_CharWidth = FONT_WIDTH;
1676 int     giVT_CharHeight = FONT_HEIGHT;
1677
1678 // === CODE ===
1679 /**
1680  * \brief Render a font character
1681  */
1682 void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC)
1683 {
1684         Uint8   *font;
1685          int    x, y;
1686
1687         // 8-bpp and below
1688         if( Depth <= 8 )
1689         {
1690                 Uint8   *buf = Buffer;
1691
1692                 font = VT_Font_GetChar(Codepoint);
1693
1694                 for(y = 0; y < FONT_HEIGHT; y ++)
1695                 {
1696                         for(x = 0; x < FONT_WIDTH; x ++)
1697                         {
1698                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1699                                         buf[x] = FGC;
1700                                 else
1701                                         buf[x] = BGC;
1702                         }
1703                         buf = (void*)( (tVAddr)buf + Pitch );
1704                         font ++;
1705                 }
1706         }
1707         // 16-bpp and below
1708         else if( Depth <= 16 )
1709         {
1710                 Uint16  *buf = Buffer;
1711
1712                 font = VT_Font_GetChar(Codepoint);
1713
1714                 for(y = 0; y < FONT_HEIGHT; y ++)
1715                 {
1716                         for(x = 0; x < FONT_WIDTH; x ++)
1717                         {
1718                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1719                                         buf[x] = FGC;
1720                                 else
1721                                         buf[x] = BGC;
1722                         }
1723                         buf = (void*)( (tVAddr)buf + Pitch );
1724                         font ++;
1725                 }
1726         }
1727         // 24-bpp colour
1728         // - Special handling to not overwrite the next pixel
1729         //TODO: Endian issues here
1730         else if( Depth == 24 )
1731         {
1732                 Uint8   *buf = Buffer;
1733                 Uint8   bg_r = (BGC >> 16) & 0xFF;
1734                 Uint8   bg_g = (BGC >>  8) & 0xFF;
1735                 Uint8   bg_b = (BGC >>  0) & 0xFF;
1736                 Uint8   fg_r = (FGC >> 16) & 0xFF;
1737                 Uint8   fg_g = (FGC >>  8) & 0xFF;
1738                 Uint8   fg_b = (FGC >>  0) & 0xFF;
1739
1740                 font = VT_Font_GetChar(Codepoint);
1741
1742                 for(y = 0; y < FONT_HEIGHT; y ++)
1743                 {
1744                         for(x = 0; x < FONT_WIDTH; x ++)
1745                         {
1746                                 Uint8   r, g, b;
1747
1748                                 if(*font & (1 << (FONT_WIDTH-x-1))) {
1749                                         r = fg_r;       g = fg_g;       b = fg_b;
1750                                 }
1751                                 else {
1752                                         r = bg_r;       g = bg_g;       b = bg_b;
1753                                 }
1754                                 buf[x*3+0] = b;
1755                                 buf[x*3+1] = g;
1756                                 buf[x*3+2] = r;
1757                         }
1758                         buf = (void*)( (tVAddr)buf + Pitch );
1759                         font ++;
1760                 }
1761         }
1762         // 32-bpp colour (nice and easy)
1763         else if( Depth == 32 )
1764         {
1765                 Uint32  *buf = Buffer;
1766
1767                 font = VT_Font_GetChar(Codepoint);
1768
1769                 for(y = 0; y < FONT_HEIGHT; y ++)
1770                 {
1771                         for(x = 0; x < FONT_WIDTH; x ++)
1772                         {
1773                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1774                                         buf[x] = FGC;
1775                                 else
1776                                         buf[x] = BGC;
1777                         }
1778                         buf = (Uint32*)( (tVAddr)buf + Pitch );
1779                         font ++;
1780                 }
1781         }
1782 }
1783
1784 /**
1785  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
1786  * \brief Converts a 12-bit colour into 24 bits
1787  */
1788 Uint32 VT_Colour12to24(Uint16 Col12)
1789 {
1790         Uint32  ret;
1791          int    tmp;
1792         tmp = Col12 & 0xF;
1793         ret  = (tmp << 0) | (tmp << 4);
1794         tmp = (Col12 & 0xF0) >> 4;
1795         ret |= (tmp << 8) | (tmp << 12);
1796         tmp = (Col12 & 0xF00) >> 8;
1797         ret |= (tmp << 16) | (tmp << 20);
1798         return ret;
1799 }
1800 /**
1801  * \brief Converts a 12-bit colour into 15 bits
1802  */
1803 Uint16 VT_Colour12to15(Uint16 Col12)
1804 {
1805         Uint32  ret;
1806          int    tmp;
1807         tmp = Col12 & 0xF;
1808         ret  = (tmp << 1) | (tmp & 1);
1809         tmp = (Col12 & 0xF0) >> 4;
1810         ret |= ( (tmp << 1) | (tmp & 1) ) << 5;
1811         tmp = (Col12 & 0xF00) >> 8;
1812         ret |= ( (tmp << 1) | (tmp & 1) ) << 10;
1813         return ret;
1814 }
1815
1816 /**
1817  * \brief Converts a 12-bit colour into any other depth
1818  * \param Col12 12-bit source colour
1819  * \param Depth Desired bit deptj
1820  * \note Green then blue get the extra avaliable bits (16:5-6-5, 14:4-5-5)
1821  */
1822 Uint32 VT_Colour12toN(Uint16 Col12, int Depth)
1823 {
1824         Uint32  ret;
1825         Uint32  r, g, b;
1826          int    rSize, gSize, bSize;
1827
1828         // Fast returns
1829         if( Depth == 24 )       return VT_Colour12to24(Col12);
1830         if( Depth == 15 )       return VT_Colour12to15(Col12);
1831         // - 32 is a special case, it's usually 24-bit colour with an unused byte
1832         if( Depth == 32 )       return VT_Colour12to24(Col12);
1833
1834         // Bounds checks
1835         if( Depth < 8 ) return 0;
1836         if( Depth > 32 )        return 0;
1837
1838         r = Col12 & 0xF;
1839         g = (Col12 & 0xF0) >> 4;
1840         b = (Col12 & 0xF00) >> 8;
1841
1842         rSize = gSize = bSize = Depth / 3;
1843         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 1
1844                 gSize ++;
1845         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 2
1846                 bSize ++;
1847
1848         // Expand
1849         r <<= rSize - 4;        g <<= gSize - 4;        b <<= bSize - 4;
1850         // Fill with the lowest bit
1851         if( Col12 & 0x001 )     r |= (1 << (rSize - 4)) - 1;
1852         if( Col12 & 0x010 )     r |= (1 << (gSize - 4)) - 1;
1853         if( Col12 & 0x100 )     r |= (1 << (bSize - 4)) - 1;
1854
1855         // Create output
1856         ret  = r;
1857         ret |= g << rSize;
1858         ret |= b << (rSize + gSize);
1859
1860         return ret;
1861 }
1862
1863 /**
1864  * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
1865  * \brief Gets an index into the font array given a Unicode Codepoint
1866  * \note See http://en.wikipedia.org/wiki/CP437
1867  */
1868 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
1869 {
1870          int    index = 0;
1871         if(Codepoint < 128)
1872                 return &VTermFont[Codepoint*FONT_HEIGHT];
1873         switch(Codepoint)
1874         {
1875         case 0xC7:      index = 128;    break;  // Ç
1876         case 0xFC:      index = 129;    break;  // ü
1877         case 0xE9:      index = 130;    break;  // é
1878         case 0xE2:      index = 131;    break;  // â
1879         case 0xE4:      index = 132;    break;  // ä
1880         case 0xE0:      index = 133;    break;  // à
1881         case 0xE5:      index = 134;    break;  // å
1882         case 0xE7:      index = 135;    break;  // ç
1883         case 0xEA:      index = 136;    break;  // ê
1884         case 0xEB:      index = 137;    break;  // ë
1885         case 0xE8:      index = 138;    break;  // è
1886         case 0xEF:      index = 139;    break;  // ï
1887         case 0xEE:      index = 140;    break;  // î
1888         case 0xEC:      index = 141;    break;  // ì
1889         case 0xC4:      index = 142;    break;  // Ä
1890         case 0xC5:      index = 143;    break;  // Å
1891         }
1892
1893         return &VTermFont[index*FONT_HEIGHT];
1894 }
1895
1896 EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
1897 EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
1898 EXPORT(VT_Font_Render);
1899 EXPORT(VT_Colour12to24);