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 #define VT_FLAG_SHOWCSR 0x20    //!< Always show the text cursor
  35
  36 enum eVT_InModes {
  37         VT_INMODE_TEXT8,        // UTF-8 Text Mode (VT100/xterm Emulation)
  38         VT_INMODE_TEXT32,       // UTF-32 Text Mode (Acess Native)
  39         NUM_VT_INMODES
  40 };
  41
  42 // === TYPES ===
  43 typedef struct {
  44          int    Mode;   //!< Current Mode (see ::eTplTerminal_Modes)
  45          int    Flags;  //!< Flags (see VT_FLAG_*)
  46
  47         short   NewWidth;       //!< Un-applied dimensions (Width)
  48         short   NewHeight;      //!< Un-applied dimensions (Height)
  49         short   Width;  //!< Virtual Width
  50         short   Height; //!< Virtual Height
  51         short   TextWidth;      //!< Text Virtual Width
  52         short   TextHeight;     //!< Text Virtual Height
  53
  54         Uint32  CurColour;      //!< Current Text Colour
  55
  56          int    ViewPos;        //!< View Buffer Offset (Text Only)
  57          int    WritePos;       //!< Write Buffer Offset (Text Only)
  58         tVT_Char        *Text;
  59
  60         tVT_Char        *AltBuf;        //!< Alternate Screen Buffer
  61          int    AltWritePos;    //!< Alternate write position
  62         short   ScrollTop;      //!< Top of scrolling region (smallest)
  63         short   ScrollHeight;   //!< Length of scrolling region
  64
  65          int    VideoCursorX;
  66          int    VideoCursorY;
  67
  68         tMutex  ReadingLock;    //!< Lock the VTerm when a process is reading from it
  69         tTID    ReadingThread;  //!< Owner of the lock
  70          int    InputRead;      //!< Input buffer read position
  71          int    InputWrite;     //!< Input buffer write position
  72         char    InputBuffer[MAX_INPUT_CHARS8];
  73 //      tSemaphore      InputSemaphore;
  74
  75         Uint32          *Buffer;
  76
  77         // TODO: Do I need to keep this about?
  78         // When should it be deallocated? on move to text mode, or some other time
  79         // Call set again, it's freed, and if NULL it doesn't get reallocated.
  80         tVideo_IOCtl_Bitmap     *VideoCursor;
  81
  82         char    Name[2];        //!< Name of the terminal
  83         tVFS_Node       Node;
  84 } tVTerm;
  85
  86 // === IMPORTS ===
  87 extern void     Debug_SetKTerminal(const char *File);
  88
  89 // === PROTOTYPES ===
  90  int    VT_Install(char **Arguments);
  91 void    VT_InitOutput(void);
  92 void    VT_InitInput(void);
  93 char    *VT_ReadDir(tVFS_Node *Node, int Pos);
  94 tVFS_Node       *VT_FindDir(tVFS_Node *Node, const char *Name);
  95  int    VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data);
  96 Uint64  VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  97 Uint64  VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  98  int    VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data);
  99 void    VT_SetResolution(int Width, int Height);
 100 void    VT_SetMode(int Mode);
 101 void    VT_SetTerminal(int ID);
 102 void    VT_KBCallBack(Uint32 Codepoint);
 103 void    VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count);
 104 void    VT_int_ClearLine(tVTerm *Term, int Num);
 105 void    VT_int_ParseEscape_StandardLarge(tVTerm *Term, char CmdChar, int argc, int *args);
 106  int    VT_int_ParseEscape(tVTerm *Term, char *Buffer);
 107 void    VT_int_PutChar(tVTerm *Term, Uint32 Ch);
 108 void    VT_int_ScrollText(tVTerm *Term, int Count);
 109 void    VT_int_ScrollFramebuffer( tVTerm *Term, int Count );
 110 void    VT_int_UpdateCursor( tVTerm *Term, int bShow );
 111 void    VT_int_UpdateScreen( tVTerm *Term, int UpdateAll );
 112 void    VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight);
 113 void    VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled);
 114
 115 // === CONSTANTS ===
 116 const Uint16    caVT100Colours[] = {
 117                 // Black, Red, Green, Yellow, Blue, Purple, Cyan, Gray
 118                 // Same again, but bright
 119                 VT_COL_BLACK, 0x700, 0x070, 0x770, 0x007, 0x707, 0x077, 0xAAA,
 120                 VT_COL_GREY, 0xF00, 0x0F0, 0xFF0, 0x00F, 0xF0F, 0x0FF, VT_COL_WHITE
 121         };
 122
 123 // === GLOBALS ===
 124 MODULE_DEFINE(0, VERSION, VTerm, VT_Install, NULL, DEFAULT_INPUT, NULL);
 125 tDevFS_Driver   gVT_DrvInfo = {
 126         NULL, "VTerm",
 127         {
 128         .Flags = VFS_FFLAG_DIRECTORY,
 129         .Size = NUM_VTS,
 130         .Inode = -1,
 131         .NumACLs = 0,
 132         .ReadDir = VT_ReadDir,
 133         .FindDir = VT_FindDir,
 134         .IOCtl = VT_Root_IOCtl
 135         }
 136 };
 137 // --- Terminals ---
 138 tVTerm  gVT_Terminals[NUM_VTS];
 139  int    giVT_CurrentTerminal = 0;
 140 tVTerm  *gpVT_CurTerm = &gVT_Terminals[0];
 141 // --- Video State ---
 142 short   giVT_RealWidth  = DEFAULT_WIDTH;        //!< Screen Width
 143 short   giVT_RealHeight = DEFAULT_HEIGHT;       //!< Screen Height
 144  int    giVT_Scrollback = DEFAULT_SCROLLBACK;
 145 // --- Driver Handles ---
 146 char    *gsVT_OutputDevice = NULL;
 147 char    *gsVT_InputDevice = NULL;
 148  int    giVT_OutputDevHandle = -2;
 149  int    giVT_InputDevHandle = -2;
 150 // --- Key States --- (Used for VT Switching/Magic Combos)
 151  int    gbVT_CtrlDown = 0;
 152  int    gbVT_AltDown = 0;
 153  int    gbVT_SysrqDown = 0;
 154
 155 // === CODE ===
 156 /**
 157  * \fn int VT_Install(char **Arguments)
 158  * \brief Installs the Virtual Terminal Driver
 159  */
 160 int VT_Install(char **Arguments)
 161 {
 162          int    i;
 163
 164         // Scan Arguments
 165         if(Arguments)
 166         {
 167                 char    **args;
 168                 const char      *arg;
 169                 for(args = Arguments; (arg = *args); args++ )
 170                 {
 171                         char    data[strlen(arg)+1];
 172                         char    *opt = data;
 173                         char    *val;
 174
 175                         val = strchr(arg, '=');
 176                         strcpy(data, arg);
 177                         if( val ) {
 178                                 data[ val - arg ] = '\0';
 179                                 val ++;
 180                         }
 181                         Log_Debug("VTerm", "Argument '%s'", arg);
 182
 183                         if( strcmp(opt, "Video") == 0 ) {
 184                                 if( !gsVT_OutputDevice )
 185                                         gsVT_OutputDevice = strdup(val);
 186                         }
 187                         else if( strcmp(opt, "Input") == 0 ) {
 188                                 if( !gsVT_InputDevice )
 189                                         gsVT_InputDevice = strdup(val);
 190                         }
 191                         else if( strcmp(opt, "Width") == 0 ) {
 192                                 giVT_RealWidth = atoi( val );
 193                         }
 194                         else if( strcmp(opt, "Height") == 0 ) {
 195                                 giVT_RealHeight = atoi( val );
 196                         }
 197                         else if( strcmp(opt, "Scrollback") == 0 ) {
 198                                 giVT_Scrollback = atoi( val );
 199                         }
 200                 }
 201         }
 202
 203         // Apply Defaults
 204         if(!gsVT_OutputDevice)  gsVT_OutputDevice = (char*)DEFAULT_OUTPUT;
 205         else if( Module_EnsureLoaded( gsVT_OutputDevice ) )     gsVT_OutputDevice = (char*)DEFAULT_OUTPUT;
 206         if( Module_EnsureLoaded( gsVT_OutputDevice ) )  gsVT_OutputDevice = (char*)FALLBACK_OUTPUT;
 207         if( Module_EnsureLoaded( gsVT_OutputDevice ) ) {
 208                 Log_Error("VTerm", "Fallback video '%s' is not avaliable, giving up", FALLBACK_OUTPUT);
 209                 return MODULE_ERR_MISC;
 210         }
 211
 212         if(!gsVT_InputDevice)   gsVT_InputDevice = (char*)DEFAULT_INPUT;
 213         else if( Module_EnsureLoaded( gsVT_InputDevice ) )      gsVT_InputDevice = (char*)DEFAULT_INPUT;
 214
 215         // Create device paths
 216         {
 217                 char    *tmp;
 218                 tmp = malloc( 9 + strlen(gsVT_OutputDevice) + 1 );
 219                 strcpy(tmp, "/Devices/");
 220                 strcpy(&tmp[9], gsVT_OutputDevice);
 221                 gsVT_OutputDevice = tmp;
 222
 223                 tmp = malloc( 9 + strlen(gsVT_InputDevice) + 1 );
 224                 strcpy(tmp, "/Devices/");
 225                 strcpy(&tmp[9], gsVT_InputDevice);
 226                 gsVT_InputDevice = tmp;
 227         }
 228
 229         Log_Log("VTerm", "Using '%s' as output", gsVT_OutputDevice);
 230         Log_Log("VTerm", "Using '%s' as input", gsVT_InputDevice);
 231
 232         VT_InitOutput();
 233         VT_InitInput();
 234
 235         // Create Nodes
 236         for( i = 0; i < NUM_VTS; i++ )
 237         {
 238                 gVT_Terminals[i].Mode = TERM_MODE_TEXT;
 239 //              gVT_Terminals[i].Flags = 0;
 240                 gVT_Terminals[i].Flags = VT_FLAG_HIDECSR;       //HACK - Stop all those memcpy calls
 241                 gVT_Terminals[i].CurColour = DEFAULT_COLOUR;
 242                 gVT_Terminals[i].WritePos = 0;
 243                 gVT_Terminals[i].AltWritePos = 0;
 244                 gVT_Terminals[i].ViewPos = 0;
 245                 gVT_Terminals[i].ReadingThread = -1;
 246                 gVT_Terminals[i].ScrollHeight = 0;
 247
 248                 // Initialise
 249                 VT_int_ChangeMode( &gVT_Terminals[i],
 250                         TERM_MODE_TEXT, giVT_RealWidth, giVT_RealHeight );
 251
 252                 gVT_Terminals[i].Name[0] = '0'+i;
 253                 gVT_Terminals[i].Name[1] = '\0';
 254                 gVT_Terminals[i].Node.Inode = i;
 255                 gVT_Terminals[i].Node.ImplPtr = &gVT_Terminals[i];
 256                 gVT_Terminals[i].Node.NumACLs = 0;      // Only root can open virtual terminals
 257
 258                 gVT_Terminals[i].Node.Read = VT_Read;
 259                 gVT_Terminals[i].Node.Write = VT_Write;
 260                 gVT_Terminals[i].Node.IOCtl = VT_Terminal_IOCtl;
 261 //              Semaphore_Init(&gVT_Terminals[i].InputSemaphore, 0, MAX_INPUT_CHARS8, "VTerm", gVT_Terminals[i].Name);
 262         }
 263
 264         // Add to DevFS
 265         DevFS_AddDevice( &gVT_DrvInfo );
 266
 267         // Set kernel output to VT0
 268         Debug_SetKTerminal("/Devices/VTerm/0");
 269
 270         return MODULE_ERR_OK;
 271 }
 272
 273 /**
 274  * \fn void VT_InitOutput()
 275  * \brief Initialise Video Output
 276  */
 277 void VT_InitOutput()
 278 {
 279         giVT_OutputDevHandle = VFS_Open(gsVT_OutputDevice, VFS_OPENFLAG_WRITE);
 280         if(giVT_OutputDevHandle == -1) {
 281                 Log_Warning("VTerm", "Oh F**k, I can't open the video device '%s'", gsVT_OutputDevice);
 282                 return ;
 283         }
 284         VT_SetResolution( giVT_RealWidth, giVT_RealHeight );
 285         VT_SetTerminal( 0 );
 286         VT_SetMode( VIDEO_BUFFMT_TEXT );
 287 }
 288
 289 /**
 290  * \fn void VT_InitInput()
 291  * \brief Initialises the input
 292  */
 293 void VT_InitInput()
 294 {
 295         giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
 296         if(giVT_InputDevHandle == -1) {
 297                 Log_Warning("VTerm", "Can't open the input device '%s'", gsVT_InputDevice);
 298                 return ;
 299         }
 300         VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
 301 }
 302
 303 /**
 304  * \brief Set the video resolution
 305  * \param Width New screen width
 306  * \param Height        New screen height
 307  */
 308 void VT_SetResolution(int Width, int Height)
 309 {
 310         tVideo_IOCtl_Mode       mode = {0};
 311          int    tmp;
 312          int    i;
 313
 314         // Create the video mode
 315         mode.width = Width;
 316         mode.height = Height;
 317         mode.bpp = 32;
 318         mode.flags = 0;
 319
 320         // Set video mode
 321         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_FINDMODE, &mode );
 322         tmp = mode.id;
 323         if( Width != mode.width || Height != mode.height )
 324         {
 325                 Log_Warning("VTerm",
 326                         "Selected resolution (%ix%i is not supported) by the device, using (%ix%i)",
 327                         giVT_RealWidth, giVT_RealHeight,
 328                         mode.width, mode.height
 329                         );
 330                 giVT_RealWidth = mode.width;
 331                 giVT_RealHeight = mode.height;
 332         }
 333         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_GETSETMODE, &tmp );
 334
 335         // Resize text terminals if needed
 336         if( gVT_Terminals[0].Text && (giVT_RealWidth != mode.width || giVT_RealHeight != mode.height) )
 337         {
 338                  int    newBufSize = (giVT_RealWidth/giVT_CharWidth)
 339                                         *(giVT_RealHeight/giVT_CharHeight)
 340                                         *(giVT_Scrollback+1);
 341                 //tVT_Char      *tmp;
 342                 // Resize the text terminals
 343                 Log_Debug("VTerm", "Resizing terminals to %ix%i",
 344                         giVT_RealWidth/giVT_CharWidth, giVT_RealHeight/giVT_CharHeight);
 345                 for( i = 0; i < NUM_VTS; i ++ )
 346                 {
 347                         if( gVT_Terminals[i].Mode != TERM_MODE_TEXT )   continue;
 348
 349                         gVT_Terminals[i].TextWidth = giVT_RealWidth/giVT_CharWidth;
 350                         gVT_Terminals[i].TextHeight = giVT_RealHeight/giVT_CharHeight;
 351                         gVT_Terminals[i].ScrollHeight = gVT_Terminals[i].TextHeight;
 352
 353                         gVT_Terminals[i].Text = realloc(
 354                                 gVT_Terminals[i].Text,
 355                                 newBufSize*sizeof(tVT_Char)
 356                                 );
 357                 }
 358         }
 359 }
 360
 361 /**
 362  * \brief Set video output buffer mode
 363  */
 364 void VT_SetMode(int Mode)
 365 {
 366         VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &Mode );
 367 }
 368
 369 /**
 370  * \fn char *VT_ReadDir(tVFS_Node *Node, int Pos)
 371  * \brief Read from the VTerm Directory
 372  */
 373 char *VT_ReadDir(tVFS_Node *Node, int Pos)
 374 {
 375         if(Pos < 0)     return NULL;
 376         if(Pos >= NUM_VTS)      return NULL;
 377         return strdup( gVT_Terminals[Pos].Name );
 378 }
 379
 380 /**
 381  * \fn tVFS_Node *VT_FindDir(tVFS_Node *Node, const char *Name)
 382  * \brief Find an item in the VTerm directory
 383  * \param Node  Root node
 384  * \param Name  Name (number) of the terminal
 385  */
 386 tVFS_Node *VT_FindDir(tVFS_Node *Node, const char *Name)
 387 {
 388          int    num;
 389
 390         ENTER("pNode sName", Node, Name);
 391
 392         // Open the input and output files if needed
 393         if(giVT_OutputDevHandle == -2)  VT_InitOutput();
 394         if(giVT_InputDevHandle == -2)   VT_InitInput();
 395
 396         // Sanity check name
 397         if(Name[0] < '0' || Name[0] > '9' || Name[1] != '\0') {
 398                 LEAVE('n');
 399                 return NULL;
 400         }
 401         // Get index
 402         num = Name[0] - '0';
 403         if(num >= NUM_VTS) {
 404                 LEAVE('n');
 405                 return NULL;
 406         }
 407         // Return node
 408         LEAVE('p', &gVT_Terminals[num].Node);
 409         return &gVT_Terminals[num].Node;
 410 }
 411
 412 /**
 413  * \fn int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
 414  * \brief Control the VTerm Driver
 415  */
 416 int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
 417 {
 418          int    len;
 419         switch(Id)
 420         {
 421         case DRV_IOCTL_TYPE:    return DRV_TYPE_MISC;
 422         case DRV_IOCTL_IDENT:   memcpy(Data, "VT\0\0", 4);      return 0;
 423         case DRV_IOCTL_VERSION: return VERSION;
 424         case DRV_IOCTL_LOOKUP:  return 0;
 425
 426         case 4: // Get Video Driver
 427                 if(Data)        strcpy(Data, gsVT_OutputDevice);
 428                 return strlen(gsVT_OutputDevice);
 429
 430         case 5: // Set Video Driver
 431                 if(!Data)       return -EINVAL;
 432                 if(Threads_GetUID() != 0)       return -EACCES;
 433
 434                 len = strlen(Data);
 435
 436                 // TODO: Check if the string used is a heap string
 437
 438                 free(gsVT_OutputDevice);
 439
 440                 gsVT_OutputDevice = malloc(len+1);
 441                 strcpy(gsVT_OutputDevice, Data);
 442
 443                 VFS_Close(giVT_OutputDevHandle);
 444                 giVT_OutputDevHandle = -1;
 445
 446                 VT_InitOutput();
 447                 return 1;
 448         }
 449         return 0;
 450 }
 451
 452 /**
 453  * \brief Read from a virtual terminal
 454  */
 455 Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 456 {
 457          int    pos = 0;
 458          int    avail;
 459         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 460         Uint32  *codepoint_buf = Buffer;
 461         Uint32  *codepoint_in;
 462
 463         Mutex_Acquire( &term->ReadingLock );
 464
 465         // Update cursor
 466         VT_int_UpdateCursor(term, 1);
 467
 468         // Check current mode
 469         switch(term->Mode)
 470         {
 471         // Text Mode (UTF-8)
 472         case TERM_MODE_TEXT:
 473                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UTF-8)");
 474
 475                 avail = term->InputWrite - term->InputRead;
 476                 if(avail < 0)
 477                         avail += MAX_INPUT_CHARS8;
 478                 if(avail > Length - pos)
 479                         avail = Length - pos;
 480
 481                 while( avail -- )
 482                 {
 483                         ((char*)Buffer)[pos] = term->InputBuffer[term->InputRead];
 484                         pos ++;
 485                         term->InputRead ++;
 486                         while(term->InputRead > MAX_INPUT_CHARS8)
 487                                 term->InputRead -= MAX_INPUT_CHARS8;
 488                 }
 489                 break;
 490
 491         //case TERM_MODE_FB:
 492         // Other - UCS-4
 493         default:
 494                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UCS-4)");
 495
 496                 avail = term->InputWrite - term->InputRead;
 497                 if(avail < 0)
 498                         avail += MAX_INPUT_CHARS32;
 499                 if(avail > Length - pos)
 500                         avail = Length/4 - pos;
 501
 502                 codepoint_in = (void*)term->InputBuffer;
 503                 codepoint_buf = Buffer;
 504
 505                 while( avail -- )
 506                 {
 507                         codepoint_buf[pos] = codepoint_in[term->InputRead];
 508                         pos ++;
 509                         term->InputRead ++;
 510                         while(term->InputRead > MAX_INPUT_CHARS32)
 511                                 term->InputRead -= MAX_INPUT_CHARS32;
 512                 }
 513                 pos *= 4;
 514                 break;
 515         }
 516
 517         // Mark none avaliable if buffer empty
 518         if( term->InputRead == term->InputWrite )
 519                 VFS_MarkAvaliable(&term->Node, 0);
 520
 521         term->ReadingThread = -1;
 522
 523 //      VT_int_UpdateCursor(term, term->Mode == TERM_MODE_TEXT);
 524
 525         Mutex_Release( &term->ReadingLock );
 526
 527         return pos;
 528 }
 529
 530 /**
 531  * \fn Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 532  * \brief Write to a virtual terminal
 533  */
 534 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 535 {
 536         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 537          int    size;
 538
 539         // Write
 540         switch( term->Mode )
 541         {
 542         // Print Text
 543         case TERM_MODE_TEXT:
 544                 VT_int_PutString(term, Buffer, Length);
 545                 break;
 546
 547         // Framebuffer :)
 548         case TERM_MODE_FB:
 549                 // - Sanity Checking
 550                 size = term->Width*term->Height*4;
 551                 if( Offset > size ) {
 552                         Log_Notice("VTerm", "VT_Write: Offset (0x%llx) > FBSize (0x%x)",
 553                                 Offset, size);
 554                         return 0;
 555                 }
 556                 if( Offset + Length > size ) {
 557                         Log_Notice("VTerm", "VT_Write: Offset+Length (0x%llx) > FBSize (0x%x)",
 558                                 Offset+Length, size);
 559                         Length = size - Offset;
 560                 }
 561
 562                 // Update screen if needed
 563                 if( Node->Inode == giVT_CurrentTerminal )
 564                 {
 565                         if( giVT_RealHeight > term->Height )
 566                                 Offset += (giVT_RealHeight - term->Height) / 2 * term->Width * 4;
 567                         // Handle undersized virtual terminals
 568                         if( giVT_RealWidth > term->Width )
 569                         {
 570                                 // No? :( Well, just center it
 571                                  int    x, y, w, h;
 572                                 Uint    dst_ofs;
 573                                 // TODO: Fix to handle the final line correctly?
 574                                 x = Offset/4;   y = x / term->Width;    x %= term->Width;
 575                                 w = Length/4+x; h = w / term->Width;    w %= term->Width;
 576
 577                                 // Center
 578                                 x += (giVT_RealWidth - term->Width) / 2;
 579                                 dst_ofs = (x + y * giVT_RealWidth) * 4;
 580                                 while(h--)
 581                                 {
 582                                         VFS_WriteAt( giVT_OutputDevHandle,
 583                                                 dst_ofs,
 584                                                 term->Width * 4,
 585                                                 Buffer
 586                                                 );
 587                                         Buffer = (void*)( (Uint)Buffer + term->Width*4 );
 588                                         dst_ofs += giVT_RealWidth * 4;
 589                                 }
 590                                 return 0;
 591                         }
 592                         else
 593                         {
 594                                 return VFS_WriteAt( giVT_OutputDevHandle, Offset, Length, Buffer );
 595                         }
 596                 }
 597                 else
 598                 {
 599                         if( !term->Buffer )
 600                                 term->Buffer = malloc( term->Width * term->Height * 4 );
 601                         // Copy to the local cache
 602                         memcpy( (char*)term->Buffer + (Uint)Offset, Buffer, Length );
 603                 }
 604                 break;
 605         // Just pass on (for now)
 606         // TODO: Handle locally too to ensure no information is lost on
 607         //       VT Switch (and to isolate terminals from each other)
 608         case TERM_MODE_2DACCEL:
 609         //case TERM_MODE_3DACCEL:
 610                 if( Node->Inode == giVT_CurrentTerminal )
 611                 {
 612                         VFS_Write( giVT_OutputDevHandle, Length, Buffer );
 613                 }
 614                 break;
 615         }
 616
 617         return 0;
 618 }
 619
 620 /**
 621  * \fn int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 622  * \brief Call an IO Control on a virtual terminal
 623  */
 624 int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 625 {
 626          int    *iData = Data;
 627          int    ret;
 628         tVTerm  *term = Node->ImplPtr;
 629         ENTER("pNode iId pData", Node, Id, Data);
 630
 631         if(Id >= DRV_IOCTL_LOOKUP) {
 632                 // Only root can fiddle with graphics modes
 633                 // TODO: Remove this and replace with user ownership
 634                 if( Threads_GetUID() != 0 )     return -1;
 635         }
 636
 637         switch(Id)
 638         {
 639         // --- Core Defined
 640         case DRV_IOCTL_TYPE:
 641                 LEAVE('i', DRV_TYPE_TERMINAL);
 642                 return DRV_TYPE_TERMINAL;
 643         case DRV_IOCTL_IDENT:
 644                 memcpy(Data, "VT\0\0", 4);
 645                 LEAVE('i', 0);
 646                 return 0;
 647         case DRV_IOCTL_VERSION:
 648                 LEAVE('x', VERSION);
 649                 return VERSION;
 650         case DRV_IOCTL_LOOKUP:
 651                 LEAVE('i', 0);
 652                 return 0;
 653
 654         // Get/Set the mode (and apply any changes)
 655         case TERM_IOCTL_MODETYPE:
 656                 if(Data != NULL)
 657                 {
 658                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 659                                 LEAVE('i', -1);
 660                                 return -1;
 661                         }
 662                         Log_Log("VTerm", "VTerm %i mode set to %i", (int)Node->Inode, *iData);
 663
 664                         // Update mode if needed
 665                         if( term->Mode != *iData || term->NewWidth || term->NewHeight)
 666                         {
 667                                 // Adjust for text mode
 668                                 if( *iData == TERM_MODE_TEXT ) {
 669                                         term->NewHeight *= giVT_CharHeight;
 670                                         term->NewWidth *= giVT_CharWidth;
 671                                 }
 672                                 // Fill unchanged dimensions
 673                                 if(term->NewHeight == 0)        term->NewHeight = term->Height;
 674                                 if(term->NewWidth == 0) term->NewWidth = term->Width;
 675                                 // Set new mode
 676                                 VT_int_ChangeMode(term, *iData, term->NewWidth, term->NewHeight);
 677                                 // Clear unapplied dimensions
 678                                 term->NewWidth = 0;
 679                                 term->NewHeight = 0;
 680                         }
 681
 682                         // Update the screen dimensions
 683                         if(Node->Inode == giVT_CurrentTerminal)
 684                                 VT_SetTerminal( giVT_CurrentTerminal );
 685                 }
 686                 LEAVE('i', term->Mode);
 687                 return term->Mode;
 688
 689         // Get/set the terminal width
 690         case TERM_IOCTL_WIDTH:
 691                 if(Data != NULL) {
 692                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 693                                 LEAVE('i', -1);
 694                                 return -1;
 695                         }
 696                         term->NewWidth = *iData;
 697                 }
 698                 if( term->NewWidth )
 699                         ret = term->NewWidth;
 700                 else if( term->Mode == TERM_MODE_TEXT )
 701                         ret = term->TextWidth;
 702                 else
 703                         ret = term->Width;
 704                 LEAVE('i', ret);
 705                 return ret;
 706
 707         // Get/set the terminal height
 708         case TERM_IOCTL_HEIGHT:
 709                 if(Data != NULL) {
 710                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 711                                 LEAVE('i', -1);
 712                                 return -1;
 713                         }
 714                         term->NewHeight = *iData;
 715                 }
 716                 if( term->NewHeight )
 717                         ret = term->NewHeight;
 718                 else if( term->Mode == TERM_MODE_TEXT )
 719                         ret = term->TextHeight;
 720                 else
 721                         ret = term->Height;
 722                 LEAVE('i', ret);
 723                 return ret;
 724
 725         case TERM_IOCTL_FORCESHOW:
 726                 Log_Log("VTerm", "Thread %i forced VTerm %i to be shown",
 727                         Threads_GetTID(), (int)Node->Inode);
 728                 VT_SetTerminal( Node->Inode );
 729                 LEAVE('i', 1);
 730                 return 1;
 731
 732         case TERM_IOCTL_GETSETCURSOR:
 733                 if(Data != NULL)
 734                 {
 735                         tVideo_IOCtl_Pos        *pos = Data;
 736                         if( !CheckMem(Data, sizeof(*pos)) ) {
 737                                 errno = -EINVAL;
 738                                 LEAVE('i', -1);
 739                                 return -1;
 740                         }
 741
 742                         if( term->Mode == TERM_MODE_TEXT )
 743                         {
 744                                 if(term->Flags & VT_FLAG_ALTBUF)
 745                                         term->AltWritePos = pos->x + pos->y * term->TextWidth;
 746                                 else
 747                                         term->WritePos = pos->x + pos->y * term->TextWidth + term->ViewPos;
 748                                 VT_int_UpdateCursor(term, 0);
 749                         }
 750                         else
 751                         {
 752                                 term->VideoCursorX = pos->x;
 753                                 term->VideoCursorY = pos->y;
 754                                 VT_int_UpdateCursor(term, 1);
 755                         }
 756                 }
 757                 ret = (term->Flags & VT_FLAG_ALTBUF) ? term->AltWritePos : term->WritePos-term->ViewPos;
 758                 LEAVE('i', ret);
 759                 return ret;
 760
 761         case TERM_IOCTL_SETCURSORBITMAP: {
 762                 tVideo_IOCtl_Bitmap     *bmp = Data;
 763                 if( Data == NULL )
 764                 {
 765                         free( term->VideoCursor );
 766                         term->VideoCursor = NULL;
 767                         LEAVE('i', 0);
 768                         return 0;
 769                 }
 770
 771                 // Sanity check bitmap
 772                 if( !CheckMem(bmp, sizeof(tVideo_IOCtl_Bitmap)) ) {
 773                         Log_Notice("VTerm", "%p in TERM_IOCTL_SETCURSORBITMAP invalid", bmp);
 774                         errno = -EINVAL;
 775                         LEAVE_RET('i', -1);
 776                 }
 777                 if( !CheckMem(bmp->Data, bmp->W*bmp->H*sizeof(Uint32)) ) {
 778                         Log_Notice("VTerm", "%p in TERM_IOCTL_SETCURSORBITMAP invalid", bmp);
 779                         errno = -EINVAL;
 780                         LEAVE_RET('i', -1);
 781                 }
 782
 783                 // Reallocate if needed
 784                 if(term->VideoCursor)
 785                 {
 786                         if(bmp->W * bmp->H != term->VideoCursor->W * term->VideoCursor->H) {
 787                                 free(term->VideoCursor);
 788                                 term->VideoCursor = NULL;
 789                         }
 790                 }
 791                 if(!term->VideoCursor) {
 792                         term->VideoCursor = malloc(sizeof(tVideo_IOCtl_Pos) + bmp->W*bmp->H*sizeof(Uint32));
 793                         if(!term->VideoCursor) {
 794                                 Log_Error("VTerm", "Unable to allocate memory for cursor");
 795                                 errno = -ENOMEM;
 796                                 LEAVE_RET('i', -1);
 797                         }
 798                 }
 799
 800                 memcpy(term->VideoCursor, bmp, sizeof(tVideo_IOCtl_Pos) + bmp->W*bmp->H*sizeof(Uint32));
 801
 802                 Log_Debug("VTerm", "Set VT%i's cursor to %p %ix%i",
 803                         (int)term->Node.Inode, bmp, bmp->W, bmp->H);
 804
 805                 if(gpVT_CurTerm == term)
 806                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSORBITMAP, term->VideoCursor);
 807
 808                 LEAVE('i', 0);
 809                 return 0; }
 810         }
 811         LEAVE('i', -1);
 812         return -1;
 813 }
 814
 815 /**
 816  * \fn void VT_SetTerminal(int ID)
 817  * \brief Set the current terminal
 818  */
 819 void VT_SetTerminal(int ID)
 820 {
 821         // Copy the screen state
 822         if( ID != giVT_CurrentTerminal && gpVT_CurTerm->Mode != TERM_MODE_TEXT )
 823         {
 824                 if( !gpVT_CurTerm->Buffer )
 825                         gpVT_CurTerm->Buffer = malloc( gpVT_CurTerm->Width*gpVT_CurTerm->Height*4 );
 826                 if( gpVT_CurTerm->Width < giVT_RealWidth )
 827                 {
 828                          int    line;
 829                         Uint    ofs = 0;
 830                         Uint32  *dest = gpVT_CurTerm->Buffer;
 831                         // Slower scanline copy
 832                         for( line = 0; line < gpVT_CurTerm->Height; line ++ )
 833                         {
 834                                 VFS_ReadAt(giVT_OutputDevHandle, ofs, gpVT_CurTerm->Width*4, dest);
 835                                 ofs += giVT_RealWidth * 4;
 836                                 dest += gpVT_CurTerm->Width;
 837                         }
 838                 }
 839                 else
 840                 {
 841                         VFS_ReadAt(giVT_OutputDevHandle,
 842                                 0, gpVT_CurTerm->Height*giVT_RealWidth*4,
 843                                 gpVT_CurTerm->Buffer
 844                                 );
 845                 }
 846         }
 847
 848         // Update current terminal ID
 849         Log_Log("VTerm", "Changed terminal from %i to %i", giVT_CurrentTerminal, ID);
 850         giVT_CurrentTerminal = ID;
 851         gpVT_CurTerm = &gVT_Terminals[ID];
 852
 853         if( gpVT_CurTerm->Mode == TERM_MODE_TEXT )
 854         {
 855                 VT_SetMode( VIDEO_BUFFMT_TEXT );
 856         }
 857         else
 858         {
 859                 // Update the cursor image
 860                 if(gpVT_CurTerm->VideoCursor)
 861                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSORBITMAP, gpVT_CurTerm->VideoCursor);
 862                 VT_SetMode( VIDEO_BUFFMT_FRAMEBUFFER );
 863         }
 864
 865         if(gpVT_CurTerm->Buffer)
 866         {
 867                 // TODO: Handle non equal sized
 868                 VFS_WriteAt(
 869                         giVT_OutputDevHandle,
 870                         0,
 871                         gpVT_CurTerm->Width*gpVT_CurTerm->Height*sizeof(Uint32),
 872                         gpVT_CurTerm->Buffer
 873                         );
 874         }
 875
 876         VT_int_UpdateCursor(gpVT_CurTerm, 1);
 877         // Update the screen
 878 //      VT_int_UpdateScreen(gpVT_CurTerm, 1);
 879 }
 880
 881 /**
 882  * \fn void VT_KBCallBack(Uint32 Codepoint)
 883  * \brief Called on keyboard interrupt
 884  * \param Codepoint     Pseudo-UTF32 character
 885  *
 886  * Handles a key press and sends the key code to the user's buffer.
 887  * If the code creates a kernel-magic sequence, it is not passed to the
 888  * user and is handled in-kernel.
 889  */
 890 void VT_KBCallBack(Uint32 Codepoint)
 891 {
 892         tVTerm  *term = gpVT_CurTerm;
 893
 894         // How the hell did we get a codepoint of zero?
 895         if(Codepoint == 0)      return;
 896
 897         // Key Up
 898         if( Codepoint & 0x80000000 )
 899         {
 900                 Codepoint &= 0x7FFFFFFF;
 901                 switch(Codepoint)
 902                 {
 903                 case KEY_LALT:  gbVT_AltDown &= ~1;     break;
 904                 case KEY_RALT:  gbVT_AltDown &= ~2;     break;
 905                 case KEY_LCTRL: gbVT_CtrlDown &= ~1;    break;
 906                 case KEY_RCTRL: gbVT_CtrlDown &= ~2;    break;
 907                 }
 908                 return;
 909         }
 910
 911         switch(Codepoint)
 912         {
 913         case KEY_LALT:  gbVT_AltDown |= 1;      break;
 914         case KEY_RALT:  gbVT_AltDown |= 2;      break;
 915         case KEY_LCTRL: gbVT_CtrlDown |= 1;     break;
 916         case KEY_RCTRL: gbVT_CtrlDown |= 2;     break;
 917
 918         default:
 919                 if(!gbVT_AltDown || !gbVT_CtrlDown)
 920                         break;
 921                 switch(Codepoint)
 922                 {
 923                 case KEY_F1:    VT_SetTerminal(0);      return;
 924                 case KEY_F2:    VT_SetTerminal(1);      return;
 925                 case KEY_F3:    VT_SetTerminal(2);      return;
 926                 case KEY_F4:    VT_SetTerminal(3);      return;
 927                 case KEY_F5:    VT_SetTerminal(4);      return;
 928                 case KEY_F6:    VT_SetTerminal(5);      return;
 929                 case KEY_F7:    VT_SetTerminal(6);      return;
 930                 case KEY_F8:    VT_SetTerminal(7);      return;
 931                 case KEY_F9:    VT_SetTerminal(8);      return;
 932                 case KEY_F10:   VT_SetTerminal(9);      return;
 933                 case KEY_F11:   VT_SetTerminal(10);     return;
 934                 case KEY_F12:   VT_SetTerminal(11);     return;
 935                 // Scrolling
 936                 case KEY_PGUP:
 937                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 938                                 return ;
 939                         if( gpVT_CurTerm->ViewPos > gpVT_CurTerm->Width )
 940                                 gpVT_CurTerm->ViewPos -= gpVT_CurTerm->Width;
 941                         else
 942                                 gpVT_CurTerm->ViewPos = 0;
 943                         return;
 944                 case KEY_PGDOWN:
 945                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 946                                 return ;
 947                         if( gpVT_CurTerm->ViewPos < gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback) )
 948                                 gpVT_CurTerm->ViewPos += gpVT_CurTerm->Width;
 949                         else
 950                                 gpVT_CurTerm->ViewPos = gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback);
 951                         return;
 952                 }
 953         }
 954
 955         // Encode key
 956         if(term->Mode == TERM_MODE_TEXT)
 957         {
 958                 Uint8   buf[6] = {0};
 959                  int    len = 0;
 960
 961                 // Ignore Modifer Keys
 962                 if(Codepoint > KEY_MODIFIERS)   return;
 963
 964                 // Get UTF-8/ANSI Encoding
 965                 switch(Codepoint)
 966                 {
 967                 case KEY_LEFT:
 968                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'D';
 969                         len = 3;
 970                         break;
 971                 case KEY_RIGHT:
 972                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'C';
 973                         len = 3;
 974                         break;
 975                 case KEY_UP:
 976                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'A';
 977                         len = 3;
 978                         break;
 979                 case KEY_DOWN:
 980                         buf[0] = '\x1B';        buf[1] = '[';   buf[2] = 'B';
 981                         len = 3;
 982                         break;
 983
 984                 case KEY_PGUP:
 985                         //buf[0] = '\x1B';      buf[1] = '[';   buf[2] = '5';   // Some overline also
 986                         //len = 4;      // Commented out until I'm sure
 987                         len = 0;
 988                         break;
 989                 case KEY_PGDOWN:
 990                         len = 0;
 991                         break;
 992
 993                 // Attempt to encode in UTF-8
 994                 default:
 995                         len = WriteUTF8( buf, Codepoint );
 996                         if(len == 0) {
 997                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
 998                         }
 999                         break;
1000                 }
1001
1002                 if(len == 0) {
1003                         // Unprintable / Don't Pass
1004                         return;
1005                 }
1006
1007 #if 0
1008                 // Handle meta characters
1009                 if( !(term->Flags & VT_FLAG_RAWIN) )
1010                 {
1011                         switch(buf[0])
1012                         {
1013                         case '\3':      // ^C
1014
1015                                 break;
1016                         }
1017                 }
1018 #endif
1019
1020                 // Write
1021                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
1022                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
1023                 else {
1024                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
1025                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
1026                 }
1027                 // Roll the buffer over
1028                 term->InputWrite += len;
1029                 term->InputWrite %= MAX_INPUT_CHARS8;
1030                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
1031                         term->InputRead = term->InputWrite + 1;
1032                         term->InputRead %= MAX_INPUT_CHARS8;
1033                 }
1034         }
1035         else
1036         {
1037                 // Encode the raw UTF-32 Key
1038                 Uint32  *raw_in = (void*)term->InputBuffer;
1039                 raw_in[ term->InputWrite ] = Codepoint;
1040                 term->InputWrite ++;
1041                 term->InputWrite %= MAX_INPUT_CHARS32;
1042                 if(term->InputRead == term->InputWrite) {
1043                         term->InputRead ++;
1044                         term->InputRead %= MAX_INPUT_CHARS32;
1045                 }
1046         }
1047
1048         VFS_MarkAvaliable(&term->Node, 1);
1049 }
1050
1051 /**
1052  * \brief Clears a line in a virtual terminal
1053  * \param Term  Terminal to modify
1054  * \param Num   Line number to clear
1055  */
1056 void VT_int_ClearLine(tVTerm *Term, int Num)
1057 {
1058          int    i;
1059         tVT_Char        *cell;
1060
1061         if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )        return ;
1062
1063         cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1064         cell = &cell[ Num*Term->TextWidth ];
1065
1066         for( i = Term->TextWidth; i--; )
1067         {
1068                 cell[ i ].Ch = 0;
1069                 cell[ i ].Colour = Term->CurColour;
1070         }
1071 }
1072
1073 /**
1074  * \brief Handle a standard large escape code
1075  *
1076  * Handles any escape code of the form \x1B[n,...A where n is an integer
1077  * and A is any letter.
1078  */
1079 void VT_int_ParseEscape_StandardLarge(tVTerm *Term, char CmdChar, int argc, int *args)
1080 {
1081          int    tmp = 1;
1082         switch(CmdChar)
1083         {
1084         // Left
1085         case 'D':
1086                 tmp = -1;
1087         // Right
1088         case 'C':
1089                 if(argc == 1)   tmp *= args[0];
1090                 if( Term->Flags & VT_FLAG_ALTBUF )
1091                 {
1092                         if( (Term->AltWritePos + tmp) % Term->TextWidth == 0 ) {
1093                                 Term->AltWritePos -= Term->AltWritePos % Term->TextWidth;
1094                                 Term->AltWritePos += Term->TextWidth - 1;
1095                         }
1096                         else
1097                                 Term->AltWritePos += tmp;
1098                 }
1099                 else
1100                 {
1101                         if( (Term->WritePos + tmp) % Term->TextWidth == 0 ) {
1102                                 Term->WritePos -= Term->WritePos % Term->TextWidth;
1103                                 Term->WritePos += Term->TextWidth - 1;
1104                         }
1105                         else
1106                                 Term->WritePos += tmp;
1107                 }
1108                 break;
1109
1110         // Erase
1111         case 'J':
1112                 switch(args[0])
1113                 {
1114                 case 0: // Erase below
1115                         break;
1116                 case 1: // Erase above
1117                         break;
1118                 case 2: // Erase all
1119                         if( Term->Flags & VT_FLAG_ALTBUF )
1120                         {
1121                                  int    i = Term->TextHeight;
1122                                 while( i-- )    VT_int_ClearLine(Term, i);
1123                                 Term->AltWritePos = 0;
1124                                 VT_int_UpdateScreen(Term, 1);
1125                         }
1126                         else
1127                         {
1128                                  int    i = Term->TextHeight * (giVT_Scrollback + 1);
1129                                 while( i-- )    VT_int_ClearLine(Term, i);
1130                                 Term->WritePos = 0;
1131                                 Term->ViewPos = 0;
1132                                 VT_int_UpdateScreen(Term, 1);
1133                         }
1134                         break;
1135                 }
1136                 break;
1137
1138         // Erase in line
1139         case 'K':
1140                 switch(args[0])
1141                 {
1142                 case 0: // Erase to right
1143                         if( Term->Flags & VT_FLAG_ALTBUF )
1144                         {
1145                                  int    i, max;
1146                                 max = Term->Width - Term->AltWritePos % Term->Width;
1147                                 for( i = 0; i < max; i ++ )
1148                                         Term->AltBuf[Term->AltWritePos+i].Ch = 0;
1149                         }
1150                         else
1151                         {
1152                                  int    i, max;
1153                                 max = Term->Width - Term->WritePos % Term->Width;
1154                                 for( i = 0; i < max; i ++ )
1155                                         Term->Text[Term->WritePos+i].Ch = 0;
1156                         }
1157                         VT_int_UpdateScreen(Term, 0);
1158                         break;
1159                 case 1: // Erase to left
1160                         if( Term->Flags & VT_FLAG_ALTBUF )
1161                         {
1162                                  int    i = Term->AltWritePos % Term->Width;
1163                                 while( i -- )
1164                                         Term->AltBuf[Term->AltWritePos++].Ch = 0;
1165                         }
1166                         else
1167                         {
1168                                  int    i = Term->WritePos % Term->Width;
1169                                 while( i -- )
1170                                         Term->Text[Term->WritePos++].Ch = 0;
1171                         }
1172                         VT_int_UpdateScreen(Term, 0);
1173                         break;
1174                 case 2: // Erase all
1175                         if( Term->Flags & VT_FLAG_ALTBUF )
1176                         {
1177                                 VT_int_ClearLine(Term, Term->AltWritePos / Term->Width);
1178                         }
1179                         else
1180                         {
1181                                 VT_int_ClearLine(Term, Term->WritePos / Term->Width);
1182                         }
1183                         VT_int_UpdateScreen(Term, 0);
1184                         break;
1185                 }
1186                 break;
1187
1188         // Set cursor position
1189         case 'H':
1190                 if( Term->Flags & VT_FLAG_ALTBUF )
1191                         Term->AltWritePos = args[0] + args[1]*Term->TextWidth;
1192                 else
1193                         Term->WritePos = args[0] + args[1]*Term->TextWidth;
1194                 //Log_Debug("VTerm", "args = {%i, %i}", args[0], args[1]);
1195                 break;
1196
1197         // Scroll up `n` lines
1198         case 'S':
1199                 tmp = -1;
1200         // Scroll down `n` lines
1201         case 'T':
1202                 if(argc == 1)   tmp *= args[0];
1203                 if( Term->Flags & VT_FLAG_ALTBUF )
1204                         VT_int_ScrollText(Term, tmp);
1205                 else
1206                 {
1207                         if(Term->ViewPos/Term->TextWidth + tmp < 0)
1208                                 break;
1209                         if(Term->ViewPos/Term->TextWidth + tmp  > Term->TextHeight * (giVT_Scrollback + 1))
1210                                 break;
1211
1212                         Term->ViewPos += Term->TextWidth*tmp;
1213                 }
1214                 break;
1215
1216         // Set Font flags
1217         case 'm':
1218                 for( ; argc--; )
1219                 {
1220                          int    colour_idx;
1221                         // Flags
1222                         if( 0 <= args[argc] && args[argc] <= 8)
1223                         {
1224                                 switch(args[argc])
1225                                 {
1226                                 case 0: Term->CurColour = DEFAULT_COLOUR;       break;  // Reset
1227                                 case 1: Term->CurColour |= 0x80000000;  break;  // Bright
1228                                 case 2: Term->CurColour &= ~0x80000000; break;  // Dim
1229                                 }
1230                         }
1231                         // Foreground Colour
1232                         else if(30 <= args[argc] && args[argc] <= 37) {
1233                                 // Get colour index, accounting for bright bit
1234                                 colour_idx = args[argc]-30 + ((Term->CurColour>>28) & 8);
1235                                 Term->CurColour &= 0x8000FFFF;
1236                                 Term->CurColour |= (Uint32)caVT100Colours[ colour_idx ] << 16;
1237                         }
1238                         // Background Colour
1239                         else if(40 <= args[argc] && args[argc] <= 47) {
1240                                 // Get colour index, accounting for bright bit
1241                                 colour_idx = args[argc]-40 + ((Term->CurColour>>12) & 8);
1242                                 Term->CurColour &= 0xFFFF8000;
1243                                 Term->CurColour |= caVT100Colours[ colour_idx ];
1244                         }
1245                         else {
1246                                 Log_Warning("VTerm", "Unknown font flag %i", args[argc]);
1247                         }
1248                 }
1249                 break;
1250
1251         // Set scrolling region
1252         case 'r':
1253                 if( argc != 2 ) break;
1254                 Term->ScrollTop = args[0];
1255                 Term->ScrollHeight = args[1] - args[0];
1256                 break;
1257
1258         default:
1259                 Log_Warning("VTerm", "Unknown control sequence '\\x1B[%c'", CmdChar);
1260                 break;
1261         }
1262 }
1263
1264 /**
1265  * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
1266  * \brief Parses a VT100 Escape code
1267  */
1268 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
1269 {
1270         char    c;
1271          int    argc = 0, j = 1;
1272          int    args[6] = {0,0,0,0};
1273          int    bQuestionMark = 0;
1274
1275         switch(Buffer[0])
1276         {
1277         //Large Code
1278         case '[':
1279                 // Get Arguments
1280                 c = Buffer[j++];
1281                 if(c == '?') {
1282                         bQuestionMark = 1;
1283                         c = Buffer[j++];
1284                 }
1285                 if( '0' <= c && c <= '9' )
1286                 {
1287                         do {
1288                                 if(c == ';')    c = Buffer[j++];
1289                                 while('0' <= c && c <= '9') {
1290                                         args[argc] *= 10;
1291                                         args[argc] += c-'0';
1292                                         c = Buffer[j++];
1293                                 }
1294                                 argc ++;
1295                         } while(c == ';');
1296                 }
1297
1298                 // Get Command
1299                 if( ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
1300                 {
1301                         if( bQuestionMark )
1302                         {
1303                                 switch(c)
1304                                 {
1305                                 // DEC Private Mode Set
1306                                 case 'h':
1307                                         if(argc != 1)   break;
1308                                         switch(args[0])
1309                                         {
1310                                         case 1047:
1311                                                 VT_int_ToggleAltBuffer(Term, 1);
1312                                                 break;
1313                                         }
1314                                         break;
1315                                 case 'l':
1316                                         if(argc != 1)   break;
1317                                         switch(args[0])
1318                                         {
1319                                         case 1047:
1320                                                 VT_int_ToggleAltBuffer(Term, 0);
1321                                                 break;
1322                                         }
1323                                         break;
1324                                 default:
1325                                         Log_Warning("VTerm", "Unknown control sequence '\\x1B[?%c'", c);
1326                                         break;
1327                                 }
1328                         }
1329                         else
1330                         {
1331                                 VT_int_ParseEscape_StandardLarge(Term, c, argc, args);
1332                         }
1333                 }
1334                 break;
1335
1336         default:
1337                 Log_Notice("VTerm", "TODO: Handle short escape codes");
1338                 break;
1339         }
1340
1341         //Log_Debug("VTerm", "j = %i, Buffer = '%s'", j, Buffer);
1342         return j;
1343 }
1344
1345 /**
1346  * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1347  * \brief Print a string to the Virtual Terminal
1348  */
1349 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1350 {
1351         Uint32  val;
1352          int    i;
1353
1354         // Iterate
1355         for( i = 0; i < Count; i++ )
1356         {
1357                 // Handle escape sequences
1358                 if( Buffer[i] == 0x1B )
1359                 {
1360                         i ++;
1361                         i += VT_int_ParseEscape(Term, (char*)&Buffer[i]) - 1;
1362                         continue;
1363                 }
1364
1365                 // Fast check for non UTF-8
1366                 if( Buffer[i] < 128 )   // Plain ASCII
1367                         VT_int_PutChar(Term, Buffer[i]);
1368                 else {  // UTF-8
1369                         i += ReadUTF8(&Buffer[i], &val) - 1;
1370                         VT_int_PutChar(Term, val);
1371                 }
1372         }
1373         // Update Screen
1374         VT_int_UpdateScreen( Term, 0 );
1375 }
1376
1377 /**
1378  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1379  * \brief Write a single character to a VTerm
1380  */
1381 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1382 {
1383          int    i;
1384         tVT_Char        *buffer;
1385          int    write_pos;
1386
1387         if(Term->Flags & VT_FLAG_ALTBUF) {
1388                 buffer = Term->AltBuf;
1389                 write_pos = Term->AltWritePos;
1390         }
1391         else {
1392                 buffer = Term->Text;
1393                 write_pos = Term->WritePos;
1394         }
1395
1396         switch(Ch)
1397         {
1398         case '\0':      return; // Ignore NULL byte
1399         case '\n':
1400                 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
1401                 write_pos += Term->TextWidth;
1402         case '\r':
1403                 write_pos -= write_pos % Term->TextWidth;
1404                 break;
1405
1406         case '\t': { int tmp = write_pos / Term->TextWidth;
1407                 write_pos %= Term->TextWidth;
1408                 do {
1409                         buffer[ write_pos ].Ch = '\0';
1410                         buffer[ write_pos ].Colour = Term->CurColour;
1411                         write_pos ++;
1412                 } while(write_pos & 7);
1413                 write_pos += tmp * Term->TextWidth;
1414                 break; }
1415
1416         case '\b':
1417                 // Backspace is invalid at Offset 0
1418                 if(write_pos == 0)      break;
1419
1420                 write_pos --;
1421                 // Singe Character
1422                 if(buffer[ write_pos ].Ch != '\0') {
1423                         buffer[ write_pos ].Ch = 0;
1424                         buffer[ write_pos ].Colour = Term->CurColour;
1425                         break;
1426                 }
1427                 // Tab
1428                 i = 7;  // Limit it to 8
1429                 do {
1430                         buffer[ write_pos ].Ch = 0;
1431                         buffer[ write_pos ].Colour = Term->CurColour;
1432                         write_pos --;
1433                 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
1434                 if(buffer[ write_pos ].Ch != '\0')
1435                         write_pos ++;
1436                 break;
1437
1438         default:
1439                 buffer[ write_pos ].Ch = Ch;
1440                 buffer[ write_pos ].Colour = Term->CurColour;
1441                 // Update the line before wrapping
1442                 if( (write_pos + 1) % Term->TextWidth == 0 )
1443                         VT_int_UpdateScreen( Term, 0 );
1444                 write_pos ++;
1445                 break;
1446         }
1447
1448         if(Term->Flags & VT_FLAG_ALTBUF)
1449         {
1450                 Term->AltBuf = buffer;
1451                 Term->AltWritePos = write_pos;
1452
1453                 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
1454                 {
1455                         Term->AltWritePos -= Term->TextWidth;
1456                         VT_int_ScrollText(Term, 1);
1457                 }
1458
1459         }
1460         else
1461         {
1462                 Term->Text = buffer;
1463                 Term->WritePos = write_pos;
1464                 // Move Screen
1465                 // - Check if we need to scroll the entire scrollback buffer
1466                 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
1467                 {
1468                          int    base;
1469
1470                         // Update previous line
1471                         Term->WritePos -= Term->TextWidth;
1472                         VT_int_UpdateScreen( Term, 0 );
1473
1474                         // Update view position
1475                         base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
1476                         if(Term->ViewPos < base)
1477                                 Term->ViewPos += Term->Width;
1478                         if(Term->ViewPos > base)
1479                                 Term->ViewPos = base;
1480
1481                         VT_int_ScrollText(Term, 1);
1482                 }
1483                 // Ok, so we only need to scroll the screen
1484                 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
1485                 {
1486                         // Update the last line
1487                         Term->WritePos -= Term->TextWidth;
1488                         VT_int_UpdateScreen( Term, 0 );
1489                         Term->WritePos += Term->TextWidth;
1490
1491                         VT_int_ScrollText(Term, 1);
1492
1493                         Term->ViewPos += Term->TextWidth;
1494                 }
1495         }
1496
1497         //LEAVE('-');
1498 }
1499
1500 void VT_int_ScrollText(tVTerm *Term, int Count)
1501 {
1502         tVT_Char        *buf;
1503          int    height, init_write_pos;
1504          int    len, i;
1505          int    scroll_top, scroll_height;
1506
1507         // Get buffer pointer and attributes
1508         if( Term->Flags & VT_FLAG_ALTBUF )
1509         {
1510                 buf = Term->AltBuf;
1511                 height = Term->TextHeight;
1512                 init_write_pos = Term->AltWritePos;
1513                 scroll_top = Term->ScrollTop;
1514                 scroll_height = Term->ScrollHeight;
1515         }
1516         else
1517         {
1518                 buf = Term->Text;
1519                 height = Term->TextHeight*(giVT_Scrollback+1);
1520                 init_write_pos = Term->WritePos;
1521                 scroll_top = 0;
1522                 scroll_height = height;
1523         }
1524
1525         // Scroll text downwards
1526         if( Count > 0 )
1527         {
1528                  int    base;
1529
1530                 // Set up
1531                 if(Count > scroll_height)       Count = scroll_height;
1532                 base = Term->TextWidth*(scroll_top + scroll_height - Count);
1533                 len = Term->TextWidth*(scroll_height - Count);
1534
1535                 // Scroll terminal cache
1536                 memmove(
1537                         &buf[Term->TextWidth*scroll_top],
1538                         &buf[Term->TextWidth*(scroll_top+Count)],
1539                         len*sizeof(tVT_Char)
1540                         );
1541                 // Clear last rows
1542                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1543                 {
1544                         buf[ base + i ].Ch = 0;
1545                         buf[ base + i ].Colour = Term->CurColour;
1546                 }
1547
1548                 // Update Screen
1549                 VT_int_ScrollFramebuffer( Term, Count );
1550                 if( Term->Flags & VT_FLAG_ALTBUF )
1551                         Term->AltWritePos = base;
1552                 else
1553                         Term->WritePos = Term->ViewPos + Term->TextWidth*(Term->TextHeight - Count);
1554                 for( i = 0; i < Count; i ++ )
1555                 {
1556                         VT_int_UpdateScreen( Term, 0 );
1557                         if( Term->Flags & VT_FLAG_ALTBUF )
1558                                 Term->AltWritePos += Term->TextWidth;
1559                         else
1560                                 Term->WritePos += Term->TextWidth;
1561                 }
1562         }
1563         else
1564         {
1565                 Count = -Count;
1566                 if(Count > scroll_height)       Count = scroll_height;
1567
1568                 len = Term->TextWidth*(scroll_height - Count);
1569
1570                 // Scroll terminal cache
1571                 memmove(
1572                         &buf[Term->TextWidth*(scroll_top+Count)],
1573                         &buf[Term->TextWidth*scroll_top],
1574                         len*sizeof(tVT_Char)
1575                         );
1576                 // Clear preceding rows
1577                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1578                 {
1579                         buf[ i ].Ch = 0;
1580                         buf[ i ].Colour = Term->CurColour;
1581                 }
1582
1583                 VT_int_ScrollFramebuffer( Term, -Count );
1584                 if( Term->Flags & VT_FLAG_ALTBUF )
1585                         Term->AltWritePos = Term->TextWidth*scroll_top;
1586                 else
1587                         Term->WritePos = Term->ViewPos;
1588                 for( i = 0; i < Count; i ++ )
1589                 {
1590                         VT_int_UpdateScreen( Term, 0 );
1591                         if( Term->Flags & VT_FLAG_ALTBUF )
1592                                 Term->AltWritePos += Term->TextWidth;
1593                         else
1594                                 Term->WritePos += Term->TextWidth;
1595                 }
1596         }
1597
1598         if( Term->Flags & VT_FLAG_ALTBUF )
1599                 Term->AltWritePos = init_write_pos;
1600         else
1601                 Term->WritePos = init_write_pos;
1602 }
1603
1604 /**
1605  * \fn void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1606  * \note Scrolls the framebuffer down by \a Count text lines
1607  */
1608 void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1609 {
1610          int    tmp;
1611         struct {
1612                 Uint8   Op;
1613                 Uint16  DstX, DstY;
1614                 Uint16  SrcX, SrcY;
1615                 Uint16  W, H;
1616         } PACKED        buf;
1617
1618         // Only update if this is the current terminal
1619         if( Term != gpVT_CurTerm )      return;
1620
1621         if( Count > Term->ScrollHeight )        Count = Term->ScrollHeight;
1622         if( Count < -Term->ScrollHeight )       Count = -Term->ScrollHeight;
1623
1624         // Switch to 2D Command Stream
1625         tmp = VIDEO_BUFFMT_2DSTREAM;
1626         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1627
1628         // BLIT to 0,0 from 0,giVT_CharHeight
1629         buf.Op = VIDEO_2DOP_BLIT;
1630         buf.SrcX = 0;   buf.DstX = 0;
1631         // TODO: Don't assume character dimensions
1632         buf.W = Term->TextWidth * giVT_CharWidth;
1633         if( Count > 0 )
1634         {
1635                 buf.SrcY = (Term->ScrollTop+Count) * giVT_CharHeight;
1636                 buf.DstY = Term->ScrollTop * giVT_CharHeight;
1637         }
1638         else    // Scroll up, move text down
1639         {
1640                 Count = -Count;
1641                 buf.SrcY = Term->ScrollTop * giVT_CharHeight;
1642                 buf.DstY = (Term->ScrollTop+Count) * giVT_CharHeight;
1643         }
1644         buf.H = (Term->ScrollHeight-Count) * giVT_CharHeight;
1645         VFS_WriteAt(giVT_OutputDevHandle, 0, sizeof(buf), &buf);
1646
1647         // Restore old mode (this function is only called during text mode)
1648         tmp = VIDEO_BUFFMT_TEXT;
1649         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1650 }
1651
1652 void VT_int_UpdateCursor( tVTerm *Term, int bShow )
1653 {
1654         tVideo_IOCtl_Pos        csr_pos;
1655
1656         if( Term != gpVT_CurTerm )      return ;
1657
1658         if( !bShow )
1659         {
1660                 csr_pos.x = -1;
1661                 csr_pos.y = -1;
1662         }
1663         else if( Term->Mode == TERM_MODE_TEXT )
1664         {
1665                  int    offset;
1666
1667 //              if( !(Term->Flags & VT_FLAG_SHOWCSR)
1668 //               && ( (Term->Flags & VT_FLAG_HIDECSR) || !Term->Node.ReadThreads)
1669 //                )
1670                 if( !Term->Text || Term->Flags & VT_FLAG_HIDECSR )
1671                 {
1672                         csr_pos.x = -1;
1673                         csr_pos.y = -1;
1674                 }
1675                 else
1676                 {
1677                         if(Term->Flags & VT_FLAG_ALTBUF)
1678                                 offset = Term->AltWritePos;
1679                         else
1680                                 offset = Term->WritePos - Term->ViewPos;
1681
1682                         csr_pos.x = offset % Term->TextWidth;
1683                         csr_pos.y = offset / Term->TextWidth;
1684                         if( 0 > csr_pos.y || csr_pos.y >= Term->TextHeight )
1685                                 csr_pos.y = -1, csr_pos.x = -1;
1686                 }
1687         }
1688         else
1689         {
1690                 csr_pos.x = Term->VideoCursorX;
1691                 csr_pos.y = Term->VideoCursorY;
1692         }
1693         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &csr_pos);
1694 }
1695
1696 /**
1697  * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1698  * \brief Updates the video framebuffer
1699  */
1700 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1701 {
1702         tVT_Char        *buffer;
1703          int    view_pos, write_pos;
1704         // Only update if this is the current terminal
1705         if( Term != gpVT_CurTerm )      return;
1706
1707         switch( Term->Mode )
1708         {
1709         case TERM_MODE_TEXT:
1710                 view_pos = (Term->Flags & VT_FLAG_ALTBUF) ? 0 : Term->ViewPos;
1711                 write_pos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
1712                 buffer = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1713                 // Re copy the entire screen?
1714                 if(UpdateAll) {
1715                         VFS_WriteAt(
1716                                 giVT_OutputDevHandle,
1717                                 0,
1718                                 Term->TextWidth*Term->TextHeight*sizeof(tVT_Char),
1719                                 &buffer[view_pos]
1720                                 );
1721                 }
1722                 // Only copy the current line
1723                 else {
1724                          int    ofs = write_pos - write_pos % Term->TextWidth;
1725                         VFS_WriteAt(
1726                                 giVT_OutputDevHandle,
1727                                 (ofs - view_pos)*sizeof(tVT_Char),
1728                                 Term->TextWidth*sizeof(tVT_Char),
1729                                 &buffer[ofs]
1730                                 );
1731                 }
1732                 break;
1733         case TERM_MODE_FB:
1734                 break;
1735         }
1736
1737         VT_int_UpdateCursor(Term, 1);
1738 }
1739
1740 /**
1741  * \brief Update the screen mode
1742  * \param Term  Terminal to update
1743  * \param NewMode       New mode to set
1744  * \param NewWidth      New framebuffer width
1745  * \param NewHeight     New framebuffer height
1746  */
1747 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
1748 {
1749          int    oldW = Term->Width;
1750          int    oldTW = Term->TextWidth;
1751          int    oldH = Term->Height;
1752          int    oldTH = Term->TextHeight;
1753         tVT_Char        *oldTBuf = Term->Text;
1754         Uint32  *oldFB = Term->Buffer;
1755          int    w, h, i;
1756
1757         // TODO: Increase RealWidth/RealHeight when this happens
1758         if(NewWidth > giVT_RealWidth)   NewWidth = giVT_RealWidth;
1759         if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
1760
1761         Term->Mode = NewMode;
1762
1763         // Fast exit if no resolution change
1764         if(NewWidth == Term->Width && NewHeight == Term->Height)
1765                 return ;
1766
1767         // Calculate new dimensions
1768         Term->Width = NewWidth;
1769         Term->Height = NewHeight;
1770         Term->TextWidth = NewWidth / giVT_CharWidth;
1771         Term->TextHeight = NewHeight / giVT_CharHeight;
1772         Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
1773
1774         // Allocate new buffers
1775         // - Text
1776         Term->Text = calloc(
1777                 Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
1778                 sizeof(tVT_Char)
1779                 );
1780         if(oldTBuf) {
1781                 // Copy old buffer
1782                 w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
1783                 h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
1784                 h *= giVT_Scrollback + 1;
1785                 for( i = 0; i < h; i ++ )
1786                 {
1787                         memcpy(
1788                                 &Term->Text[i*Term->TextWidth],
1789                                 &oldTBuf[i*oldTW],
1790                                 w*sizeof(tVT_Char)
1791                                 );
1792                 }
1793                 free(oldTBuf);
1794         }
1795
1796         // - Alternate Text
1797         Term->AltBuf = realloc(
1798                 Term->AltBuf,
1799                 Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
1800                 );
1801
1802         // - Framebuffer
1803         if(oldFB) {
1804                 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
1805                 // Copy old buffer
1806                 w = (oldW > Term->Width) ? Term->Width : oldW;
1807                 h = (oldH > Term->Height) ? Term->Height : oldH;
1808                 for( i = 0; i < h; i ++ )
1809                 {
1810                         memcpy(
1811                                 &Term->Buffer[i*Term->Width],
1812                                 &oldFB[i*oldW],
1813                                 w*sizeof(Uint32)
1814                                 );
1815                 }
1816                 free(oldFB);
1817         }
1818
1819         // Debug
1820         switch(NewMode)
1821         {
1822         case TERM_MODE_TEXT:
1823                 Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
1824                         Term, Term->TextWidth, Term->TextHeight);
1825                 break;
1826         case TERM_MODE_FB:
1827                 Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
1828                         Term, Term->Width, Term->Height);
1829                 break;
1830         //case TERM_MODE_2DACCEL:
1831         //case TERM_MODE_3DACCEL:
1832         //      return;
1833         }
1834 }
1835
1836
1837 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
1838 {
1839         if(Enabled)
1840                 Term->Flags |= VT_FLAG_ALTBUF;
1841         else
1842                 Term->Flags &= ~VT_FLAG_ALTBUF;
1843         VT_int_UpdateScreen(Term, 1);
1844 }
1845
1846 // ---
1847 // Font Render
1848 // ---
1849 #define MONOSPACE_FONT  10816
1850
1851 #if MONOSPACE_FONT == 10808     // 8x8
1852 # include "vterm_font_8x8.h"
1853 #elif MONOSPACE_FONT == 10816   // 8x16
1854 # include "vterm_font_8x16.h"
1855 #endif
1856
1857 // === PROTOTYPES ===
1858 Uint8   *VT_Font_GetChar(Uint32 Codepoint);
1859
1860 // === GLOBALS ===
1861 int     giVT_CharWidth = FONT_WIDTH;
1862 int     giVT_CharHeight = FONT_HEIGHT;
1863
1864 // === CODE ===
1865 /**
1866  * \brief Render a font character
1867  */
1868 void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC)
1869 {
1870         Uint8   *font;
1871          int    x, y;
1872
1873         // 8-bpp and below
1874         if( Depth <= 8 )
1875         {
1876                 Uint8   *buf = Buffer;
1877
1878                 font = VT_Font_GetChar(Codepoint);
1879
1880                 for(y = 0; y < FONT_HEIGHT; y ++)
1881                 {
1882                         for(x = 0; x < FONT_WIDTH; x ++)
1883                         {
1884                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1885                                         buf[x] = FGC;
1886                                 else
1887                                         buf[x] = BGC;
1888                         }
1889                         buf = (void*)( (tVAddr)buf + Pitch );
1890                         font ++;
1891                 }
1892         }
1893         // 16-bpp and below
1894         else if( Depth <= 16 )
1895         {
1896                 Uint16  *buf = Buffer;
1897
1898                 font = VT_Font_GetChar(Codepoint);
1899
1900                 for(y = 0; y < FONT_HEIGHT; y ++)
1901                 {
1902                         for(x = 0; x < FONT_WIDTH; x ++)
1903                         {
1904                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1905                                         buf[x] = FGC;
1906                                 else
1907                                         buf[x] = BGC;
1908                         }
1909                         buf = (void*)( (tVAddr)buf + Pitch );
1910                         font ++;
1911                 }
1912         }
1913         // 24-bpp colour
1914         // - Special handling to not overwrite the next pixel
1915         //TODO: Endian issues here
1916         else if( Depth == 24 )
1917         {
1918                 Uint8   *buf = Buffer;
1919                 Uint8   bg_r = (BGC >> 16) & 0xFF;
1920                 Uint8   bg_g = (BGC >>  8) & 0xFF;
1921                 Uint8   bg_b = (BGC >>  0) & 0xFF;
1922                 Uint8   fg_r = (FGC >> 16) & 0xFF;
1923                 Uint8   fg_g = (FGC >>  8) & 0xFF;
1924                 Uint8   fg_b = (FGC >>  0) & 0xFF;
1925
1926                 font = VT_Font_GetChar(Codepoint);
1927
1928                 for(y = 0; y < FONT_HEIGHT; y ++)
1929                 {
1930                         for(x = 0; x < FONT_WIDTH; x ++)
1931                         {
1932                                 Uint8   r, g, b;
1933
1934                                 if(*font & (1 << (FONT_WIDTH-x-1))) {
1935                                         r = fg_r;       g = fg_g;       b = fg_b;
1936                                 }
1937                                 else {
1938                                         r = bg_r;       g = bg_g;       b = bg_b;
1939                                 }
1940                                 buf[x*3+0] = b;
1941                                 buf[x*3+1] = g;
1942                                 buf[x*3+2] = r;
1943                         }
1944                         buf = (void*)( (tVAddr)buf + Pitch );
1945                         font ++;
1946                 }
1947         }
1948         // 32-bpp colour (nice and easy)
1949         else if( Depth == 32 )
1950         {
1951                 Uint32  *buf = Buffer;
1952
1953                 font = VT_Font_GetChar(Codepoint);
1954
1955                 for(y = 0; y < FONT_HEIGHT; y ++)
1956                 {
1957                         for(x = 0; x < FONT_WIDTH; x ++)
1958                         {
1959                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1960                                         buf[x] = FGC;
1961                                 else
1962                                         buf[x] = BGC;
1963                         }
1964                         buf = (Uint32*)( (tVAddr)buf + Pitch );
1965                         font ++;
1966                 }
1967         }
1968 }
1969
1970 /**
1971  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
1972  * \brief Converts a 12-bit colour into 24 bits
1973  */
1974 Uint32 VT_Colour12to24(Uint16 Col12)
1975 {
1976         Uint32  ret;
1977          int    tmp;
1978         tmp = Col12 & 0xF;
1979         ret  = (tmp << 0) | (tmp << 4);
1980         tmp = (Col12 & 0xF0) >> 4;
1981         ret |= (tmp << 8) | (tmp << 12);
1982         tmp = (Col12 & 0xF00) >> 8;
1983         ret |= (tmp << 16) | (tmp << 20);
1984         return ret;
1985 }
1986 /**
1987  * \brief Converts a 12-bit colour into 15 bits
1988  */
1989 Uint16 VT_Colour12to15(Uint16 Col12)
1990 {
1991         Uint32  ret;
1992          int    tmp;
1993         tmp = Col12 & 0xF;
1994         ret  = (tmp << 1) | (tmp & 1);
1995         tmp = (Col12 & 0xF0) >> 4;
1996         ret |= ( (tmp << 1) | (tmp & 1) ) << 5;
1997         tmp = (Col12 & 0xF00) >> 8;
1998         ret |= ( (tmp << 1) | (tmp & 1) ) << 10;
1999         return ret;
2000 }
2001
2002 /**
2003  * \brief Converts a 12-bit colour into any other depth
2004  * \param Col12 12-bit source colour
2005  * \param Depth Desired bit deptj
2006  * \note Green then blue get the extra avaliable bits (16:5-6-5, 14:4-5-5)
2007  */
2008 Uint32 VT_Colour12toN(Uint16 Col12, int Depth)
2009 {
2010         Uint32  ret;
2011         Uint32  r, g, b;
2012          int    rSize, gSize, bSize;
2013
2014         // Fast returns
2015         if( Depth == 24 )       return VT_Colour12to24(Col12);
2016         if( Depth == 15 )       return VT_Colour12to15(Col12);
2017         // - 32 is a special case, it's usually 24-bit colour with an unused byte
2018         if( Depth == 32 )       return VT_Colour12to24(Col12);
2019
2020         // Bounds checks
2021         if( Depth < 8 ) return 0;
2022         if( Depth > 32 )        return 0;
2023
2024         r = Col12 & 0xF;
2025         g = (Col12 & 0xF0) >> 4;
2026         b = (Col12 & 0xF00) >> 8;
2027
2028         rSize = gSize = bSize = Depth / 3;
2029         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 1
2030                 gSize ++;
2031         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 2
2032                 bSize ++;
2033
2034         // Expand
2035         r <<= rSize - 4;        g <<= gSize - 4;        b <<= bSize - 4;
2036         // Fill with the lowest bit
2037         if( Col12 & 0x001 )     r |= (1 << (rSize - 4)) - 1;
2038         if( Col12 & 0x010 )     r |= (1 << (gSize - 4)) - 1;
2039         if( Col12 & 0x100 )     r |= (1 << (bSize - 4)) - 1;
2040
2041         // Create output
2042         ret  = r;
2043         ret |= g << rSize;
2044         ret |= b << (rSize + gSize);
2045
2046         return ret;
2047 }
2048
2049 /**
2050  * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
2051  * \brief Gets an index into the font array given a Unicode Codepoint
2052  * \note See http://en.wikipedia.org/wiki/CP437
2053  */
2054 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
2055 {
2056          int    index = 0;
2057         if(Codepoint < 128)
2058                 return &VTermFont[Codepoint*FONT_HEIGHT];
2059         switch(Codepoint)
2060         {
2061         case 0xC7:      index = 128;    break;  // Ç
2062         case 0xFC:      index = 129;    break;  // ü
2063         case 0xE9:      index = 130;    break;  // é
2064         case 0xE2:      index = 131;    break;  // â
2065         case 0xE4:      index = 132;    break;  // ä
2066         case 0xE0:      index = 133;    break;  // à
2067         case 0xE5:      index = 134;    break;  // å
2068         case 0xE7:      index = 135;    break;  // ç
2069         case 0xEA:      index = 136;    break;  // ê
2070         case 0xEB:      index = 137;    break;  // ë
2071         case 0xE8:      index = 138;    break;  // è
2072         case 0xEF:      index = 139;    break;  // ï
2073         case 0xEE:      index = 140;    break;  // î
2074         case 0xEC:      index = 141;    break;  // ì
2075         case 0xC4:      index = 142;    break;  // Ä
2076         case 0xC5:      index = 143;    break;  // Å
2077         }
2078
2079         return &VTermFont[index*FONT_HEIGHT];
2080 }
2081
2082 EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
2083 EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
2084 EXPORT(VT_Font_Render);
2085 EXPORT(VT_Colour12to24);