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         // Check current mode
 466         switch(term->Mode)
 467         {
 468         // Text Mode (UTF-8)
 469         case TERM_MODE_TEXT:
 470                 VT_int_UpdateCursor(term, 1);
 471
 472                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UTF-8)");
 473
 474                 avail = term->InputWrite - term->InputRead;
 475                 if(avail < 0)
 476                         avail += MAX_INPUT_CHARS8;
 477                 if(avail > Length - pos)
 478                         avail = Length - pos;
 479
 480                 while( avail -- )
 481                 {
 482                         ((char*)Buffer)[pos] = term->InputBuffer[term->InputRead];
 483                         pos ++;
 484                         term->InputRead ++;
 485                         while(term->InputRead > MAX_INPUT_CHARS8)
 486                                 term->InputRead -= MAX_INPUT_CHARS8;
 487                 }
 488                 break;
 489
 490         //case TERM_MODE_FB:
 491         // Other - UCS-4
 492         default:
 493                 VFS_SelectNode(Node, VFS_SELECT_READ, NULL, "VT_Read (UCS-4)");
 494
 495                 avail = term->InputWrite - term->InputRead;
 496                 if(avail < 0)
 497                         avail += MAX_INPUT_CHARS32;
 498                 if(avail > Length - pos)
 499                         avail = Length/4 - pos;
 500
 501                 codepoint_in = (void*)term->InputBuffer;
 502                 codepoint_buf = Buffer;
 503
 504                 while( avail -- )
 505                 {
 506                         codepoint_buf[pos] = codepoint_in[term->InputRead];
 507                         pos ++;
 508                         term->InputRead ++;
 509                         while(term->InputRead > MAX_INPUT_CHARS32)
 510                                 term->InputRead -= MAX_INPUT_CHARS32;
 511                 }
 512                 pos *= 4;
 513                 break;
 514         }
 515
 516         // Mark none avaliable if buffer empty
 517         if( term->InputRead == term->InputWrite )
 518                 VFS_MarkAvaliable(&term->Node, 0);
 519
 520         term->ReadingThread = -1;
 521
 522 //      VT_int_UpdateCursor(term, term->Mode == TERM_MODE_TEXT);
 523
 524         Mutex_Release( &term->ReadingLock );
 525
 526         return pos;
 527 }
 528
 529 /**
 530  * \fn Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 531  * \brief Write to a virtual terminal
 532  */
 533 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 534 {
 535         tVTerm  *term = &gVT_Terminals[ Node->Inode ];
 536          int    size;
 537
 538         // Write
 539         switch( term->Mode )
 540         {
 541         // Print Text
 542         case TERM_MODE_TEXT:
 543                 VT_int_PutString(term, Buffer, Length);
 544                 break;
 545
 546         // Framebuffer :)
 547         case TERM_MODE_FB:
 548                 // - Sanity Checking
 549                 size = term->Width*term->Height*4;
 550                 if( Offset > size ) {
 551                         Log_Notice("VTerm", "VT_Write: Offset (0x%llx) > FBSize (0x%x)",
 552                                 Offset, size);
 553                         return 0;
 554                 }
 555                 if( Offset + Length > size ) {
 556                         Log_Notice("VTerm", "VT_Write: Offset+Length (0x%llx) > FBSize (0x%x)",
 557                                 Offset+Length, size);
 558                         Length = size - Offset;
 559                 }
 560
 561                 // Update screen if needed
 562                 if( Node->Inode == giVT_CurrentTerminal )
 563                 {
 564                         if( giVT_RealHeight > term->Height )
 565                                 Offset += (giVT_RealHeight - term->Height) / 2 * term->Width * 4;
 566                         // Handle undersized virtual terminals
 567                         if( giVT_RealWidth > term->Width )
 568                         {
 569                                 // No? :( Well, just center it
 570                                  int    x, y, w, h;
 571                                 Uint    dst_ofs;
 572                                 // TODO: Fix to handle the final line correctly?
 573                                 x = Offset/4;   y = x / term->Width;    x %= term->Width;
 574                                 w = Length/4+x; h = w / term->Width;    w %= term->Width;
 575
 576                                 // Center
 577                                 x += (giVT_RealWidth - term->Width) / 2;
 578                                 dst_ofs = (x + y * giVT_RealWidth) * 4;
 579                                 while(h--)
 580                                 {
 581                                         VFS_WriteAt( giVT_OutputDevHandle,
 582                                                 dst_ofs,
 583                                                 term->Width * 4,
 584                                                 Buffer
 585                                                 );
 586                                         Buffer = (void*)( (Uint)Buffer + term->Width*4 );
 587                                         dst_ofs += giVT_RealWidth * 4;
 588                                 }
 589                                 return 0;
 590                         }
 591                         else
 592                         {
 593                                 return VFS_WriteAt( giVT_OutputDevHandle, Offset, Length, Buffer );
 594                         }
 595                 }
 596                 else
 597                 {
 598                         if( !term->Buffer )
 599                                 term->Buffer = malloc( term->Width * term->Height * 4 );
 600                         // Copy to the local cache
 601                         memcpy( (char*)term->Buffer + (Uint)Offset, Buffer, Length );
 602                 }
 603                 break;
 604         // Just pass on (for now)
 605         // TODO: Handle locally too to ensure no information is lost on
 606         //       VT Switch (and to isolate terminals from each other)
 607         case TERM_MODE_2DACCEL:
 608         //case TERM_MODE_3DACCEL:
 609                 if( Node->Inode == giVT_CurrentTerminal )
 610                 {
 611                         VFS_Write( giVT_OutputDevHandle, Length, Buffer );
 612                 }
 613                 break;
 614         }
 615
 616         return 0;
 617 }
 618
 619 /**
 620  * \fn int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 621  * \brief Call an IO Control on a virtual terminal
 622  */
 623 int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
 624 {
 625          int    *iData = Data;
 626          int    ret;
 627         tVTerm  *term = Node->ImplPtr;
 628         ENTER("pNode iId pData", Node, Id, Data);
 629
 630         if(Id >= DRV_IOCTL_LOOKUP) {
 631                 // Only root can fiddle with graphics modes
 632                 // TODO: Remove this and replace with user ownership
 633                 if( Threads_GetUID() != 0 )     return -1;
 634         }
 635
 636         switch(Id)
 637         {
 638         // --- Core Defined
 639         case DRV_IOCTL_TYPE:
 640                 LEAVE('i', DRV_TYPE_TERMINAL);
 641                 return DRV_TYPE_TERMINAL;
 642         case DRV_IOCTL_IDENT:
 643                 memcpy(Data, "VT\0\0", 4);
 644                 LEAVE('i', 0);
 645                 return 0;
 646         case DRV_IOCTL_VERSION:
 647                 LEAVE('x', VERSION);
 648                 return VERSION;
 649         case DRV_IOCTL_LOOKUP:
 650                 LEAVE('i', 0);
 651                 return 0;
 652
 653         // Get/Set the mode (and apply any changes)
 654         case TERM_IOCTL_MODETYPE:
 655                 if(Data != NULL)
 656                 {
 657                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 658                                 LEAVE('i', -1);
 659                                 return -1;
 660                         }
 661                         Log_Log("VTerm", "VTerm %i mode set to %i", (int)Node->Inode, *iData);
 662
 663                         // Update mode if needed
 664                         if( term->Mode != *iData || term->NewWidth || term->NewHeight)
 665                         {
 666                                 // Adjust for text mode
 667                                 if( *iData == TERM_MODE_TEXT ) {
 668                                         term->NewHeight *= giVT_CharHeight;
 669                                         term->NewWidth *= giVT_CharWidth;
 670                                 }
 671                                 // Fill unchanged dimensions
 672                                 if(term->NewHeight == 0)        term->NewHeight = term->Height;
 673                                 if(term->NewWidth == 0) term->NewWidth = term->Width;
 674                                 // Set new mode
 675                                 VT_int_ChangeMode(term, *iData, term->NewWidth, term->NewHeight);
 676                                 // Clear unapplied dimensions
 677                                 term->NewWidth = 0;
 678                                 term->NewHeight = 0;
 679                         }
 680
 681                         // Update the screen dimensions
 682                         if(Node->Inode == giVT_CurrentTerminal)
 683                                 VT_SetTerminal( giVT_CurrentTerminal );
 684                 }
 685                 LEAVE('i', term->Mode);
 686                 return term->Mode;
 687
 688         // Get/set the terminal width
 689         case TERM_IOCTL_WIDTH:
 690                 if(Data != NULL) {
 691                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 692                                 LEAVE('i', -1);
 693                                 return -1;
 694                         }
 695                         term->NewWidth = *iData;
 696                 }
 697                 if( term->NewWidth )
 698                         ret = term->NewWidth;
 699                 else if( term->Mode == TERM_MODE_TEXT )
 700                         ret = term->TextWidth;
 701                 else
 702                         ret = term->Width;
 703                 LEAVE('i', ret);
 704                 return ret;
 705
 706         // Get/set the terminal height
 707         case TERM_IOCTL_HEIGHT:
 708                 if(Data != NULL) {
 709                         if( CheckMem(Data, sizeof(int)) == 0 ) {
 710                                 LEAVE('i', -1);
 711                                 return -1;
 712                         }
 713                         term->NewHeight = *iData;
 714                 }
 715                 if( term->NewHeight )
 716                         ret = term->NewHeight;
 717                 else if( term->Mode == TERM_MODE_TEXT )
 718                         ret = term->TextHeight;
 719                 else
 720                         ret = term->Height;
 721                 LEAVE('i', ret);
 722                 return ret;
 723
 724         case TERM_IOCTL_FORCESHOW:
 725                 Log_Log("VTerm", "Thread %i forced VTerm %i to be shown",
 726                         Threads_GetTID(), (int)Node->Inode);
 727                 VT_SetTerminal( Node->Inode );
 728                 LEAVE('i', 1);
 729                 return 1;
 730
 731         case TERM_IOCTL_GETSETCURSOR:
 732                 if(Data != NULL)
 733                 {
 734                         tVideo_IOCtl_Pos        *pos = Data;
 735                         if( !CheckMem(Data, sizeof(*pos)) ) {
 736                                 errno = -EINVAL;
 737                                 LEAVE('i', -1);
 738                                 return -1;
 739                         }
 740
 741                         if( term->Mode == TERM_MODE_TEXT )
 742                         {
 743                                 if(term->Flags & VT_FLAG_ALTBUF)
 744                                         term->AltWritePos = pos->x + pos->y * term->TextWidth;
 745                                 else
 746                                         term->WritePos = pos->x + pos->y * term->TextWidth + term->ViewPos;
 747                                 VT_int_UpdateCursor(term, 0);
 748                         }
 749                         else
 750                         {
 751                                 term->VideoCursorX = pos->x;
 752                                 term->VideoCursorY = pos->y;
 753                                 VT_int_UpdateCursor(term, 1);
 754                         }
 755                 }
 756                 ret = (term->Flags & VT_FLAG_ALTBUF) ? term->AltWritePos : term->WritePos-term->ViewPos;
 757                 LEAVE('i', ret);
 758                 return ret;
 759
 760         case TERM_IOCTL_SETCURSORBITMAP: {
 761                 tVideo_IOCtl_Bitmap     *bmp = Data;
 762                 if( Data == NULL )
 763                 {
 764                         free( term->VideoCursor );
 765                         term->VideoCursor = NULL;
 766                         LEAVE('i', 0);
 767                         return 0;
 768                 }
 769
 770                 // Sanity check bitmap
 771                 if( !CheckMem(bmp, sizeof(tVideo_IOCtl_Bitmap)) ) {
 772                         Log_Notice("VTerm", "%p in TERM_IOCTL_SETCURSORBITMAP invalid", bmp);
 773                         errno = -EINVAL;
 774                         LEAVE_RET('i', -1);
 775                 }
 776                 if( !CheckMem(bmp->Data, bmp->W*bmp->H*sizeof(Uint32)) ) {
 777                         Log_Notice("VTerm", "%p in TERM_IOCTL_SETCURSORBITMAP invalid", bmp);
 778                         errno = -EINVAL;
 779                         LEAVE_RET('i', -1);
 780                 }
 781
 782                 // Reallocate if needed
 783                 if(term->VideoCursor)
 784                 {
 785                         if(bmp->W * bmp->H != term->VideoCursor->W * term->VideoCursor->H) {
 786                                 free(term->VideoCursor);
 787                                 term->VideoCursor = NULL;
 788                         }
 789                 }
 790                 if(!term->VideoCursor) {
 791                         term->VideoCursor = malloc(sizeof(tVideo_IOCtl_Pos) + bmp->W*bmp->H*sizeof(Uint32));
 792                         if(!term->VideoCursor) {
 793                                 Log_Error("VTerm", "Unable to allocate memory for cursor");
 794                                 errno = -ENOMEM;
 795                                 LEAVE_RET('i', -1);
 796                         }
 797                 }
 798
 799                 memcpy(term->VideoCursor, bmp, sizeof(tVideo_IOCtl_Pos) + bmp->W*bmp->H*sizeof(Uint32));
 800
 801                 Log_Debug("VTerm", "Set VT%i's cursor to %p %ix%i",
 802                         (int)term->Node.Inode, bmp, bmp->W, bmp->H);
 803
 804                 if(gpVT_CurTerm == term)
 805                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSORBITMAP, term->VideoCursor);
 806
 807                 LEAVE('i', 0);
 808                 return 0; }
 809         }
 810         LEAVE('i', -1);
 811         return -1;
 812 }
 813
 814 /**
 815  * \fn void VT_SetTerminal(int ID)
 816  * \brief Set the current terminal
 817  */
 818 void VT_SetTerminal(int ID)
 819 {
 820         // Copy the screen state
 821         if( ID != giVT_CurrentTerminal && gpVT_CurTerm->Mode != TERM_MODE_TEXT )
 822         {
 823                 if( !gpVT_CurTerm->Buffer )
 824                         gpVT_CurTerm->Buffer = malloc( gpVT_CurTerm->Width*gpVT_CurTerm->Height*4 );
 825                 if( gpVT_CurTerm->Width < giVT_RealWidth )
 826                 {
 827                          int    line;
 828                         Uint    ofs = 0;
 829                         Uint32  *dest = gpVT_CurTerm->Buffer;
 830                         // Slower scanline copy
 831                         for( line = 0; line < gpVT_CurTerm->Height; line ++ )
 832                         {
 833                                 VFS_ReadAt(giVT_OutputDevHandle, ofs, gpVT_CurTerm->Width*4, dest);
 834                                 ofs += giVT_RealWidth * 4;
 835                                 dest += gpVT_CurTerm->Width;
 836                         }
 837                 }
 838                 else
 839                 {
 840                         VFS_ReadAt(giVT_OutputDevHandle,
 841                                 0, gpVT_CurTerm->Height*giVT_RealWidth*4,
 842                                 gpVT_CurTerm->Buffer
 843                                 );
 844                 }
 845         }
 846
 847         // Update current terminal ID
 848         Log_Log("VTerm", "Changed terminal from %i to %i", giVT_CurrentTerminal, ID);
 849         giVT_CurrentTerminal = ID;
 850         gpVT_CurTerm = &gVT_Terminals[ID];
 851
 852         if( gpVT_CurTerm->Mode == TERM_MODE_TEXT )
 853         {
 854                 VT_SetMode( VIDEO_BUFFMT_TEXT );
 855         }
 856         else
 857         {
 858                 // Update the cursor image
 859                 if(gpVT_CurTerm->VideoCursor)
 860                         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSORBITMAP, gpVT_CurTerm->VideoCursor);
 861                 VT_SetMode( VIDEO_BUFFMT_FRAMEBUFFER );
 862         }
 863
 864         if(gpVT_CurTerm->Buffer)
 865         {
 866                 // TODO: Handle non equal sized
 867                 VFS_WriteAt(
 868                         giVT_OutputDevHandle,
 869                         0,
 870                         gpVT_CurTerm->Width*gpVT_CurTerm->Height*sizeof(Uint32),
 871                         gpVT_CurTerm->Buffer
 872                         );
 873         }
 874
 875         VT_int_UpdateCursor(gpVT_CurTerm, 1);
 876         // Update the screen
 877 //      VT_int_UpdateScreen(gpVT_CurTerm, 1);
 878 }
 879
 880 /**
 881  * \fn void VT_KBCallBack(Uint32 Codepoint)
 882  * \brief Called on keyboard interrupt
 883  * \param Codepoint     Pseudo-UTF32 character
 884  *
 885  * Handles a key press and sends the key code to the user's buffer.
 886  * If the code creates a kernel-magic sequence, it is not passed to the
 887  * user and is handled in-kernel.
 888  */
 889 void VT_KBCallBack(Uint32 Codepoint)
 890 {
 891         tVTerm  *term = gpVT_CurTerm;
 892
 893         // Key Up
 894         switch( Codepoint & KEY_ACTION_MASK )
 895         {
 896         case KEY_ACTION_RELEASE:
 897                 switch(Codepoint & KEY_CODEPOINT_MASK)
 898                 {
 899                 case KEY_LALT:  gbVT_AltDown &= ~1;     break;
 900                 case KEY_RALT:  gbVT_AltDown &= ~2;     break;
 901                 case KEY_LCTRL: gbVT_CtrlDown &= ~1;    break;
 902                 case KEY_RCTRL: gbVT_CtrlDown &= ~2;    break;
 903                 }
 904                 break;
 905
 906         case KEY_ACTION_PRESS:
 907                 switch(Codepoint & KEY_CODEPOINT_MASK)
 908                 {
 909                 case KEY_LALT:  gbVT_AltDown |= 1;      break;
 910                 case KEY_RALT:  gbVT_AltDown |= 2;      break;
 911                 case KEY_LCTRL: gbVT_CtrlDown |= 1;     break;
 912                 case KEY_RCTRL: gbVT_CtrlDown |= 2;     break;
 913                 }
 914
 915                 if(!gbVT_AltDown || !gbVT_CtrlDown)
 916                         break;
 917                 switch(Codepoint & KEY_CODEPOINT_MASK)
 918                 {
 919                 case KEY_F1:    VT_SetTerminal(0);      return;
 920                 case KEY_F2:    VT_SetTerminal(1);      return;
 921                 case KEY_F3:    VT_SetTerminal(2);      return;
 922                 case KEY_F4:    VT_SetTerminal(3);      return;
 923                 case KEY_F5:    VT_SetTerminal(4);      return;
 924                 case KEY_F6:    VT_SetTerminal(5);      return;
 925                 case KEY_F7:    VT_SetTerminal(6);      return;
 926                 case KEY_F8:    VT_SetTerminal(7);      return;
 927                 case KEY_F9:    VT_SetTerminal(8);      return;
 928                 case KEY_F10:   VT_SetTerminal(9);      return;
 929                 case KEY_F11:   VT_SetTerminal(10);     return;
 930                 case KEY_F12:   VT_SetTerminal(11);     return;
 931                 // Scrolling
 932                 case KEY_PGUP:
 933                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 934                                 return ;
 935                         if( gpVT_CurTerm->ViewPos > gpVT_CurTerm->Width )
 936                                 gpVT_CurTerm->ViewPos -= gpVT_CurTerm->Width;
 937                         else
 938                                 gpVT_CurTerm->ViewPos = 0;
 939                         return;
 940                 case KEY_PGDOWN:
 941                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 942                                 return ;
 943                         if( gpVT_CurTerm->ViewPos < gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback) )
 944                                 gpVT_CurTerm->ViewPos += gpVT_CurTerm->Width;
 945                         else
 946                                 gpVT_CurTerm->ViewPos = gpVT_CurTerm->Width*gpVT_CurTerm->Height*(giVT_Scrollback);
 947                         return;
 948                 }
 949                 break;
 950         }
 951
 952         // Encode key
 953         if(term->Mode == TERM_MODE_TEXT)
 954         {
 955                 Uint8   buf[6] = {0};
 956                  int    len = 0;
 957
 958                 // Ignore anything that isn't a press or refire
 959                 if( (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_PRESS
 960                  && (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_REFIRE
 961                     )
 962                 {
 963                         return ;
 964                 }
 965
 966                 Codepoint &= KEY_CODEPOINT_MASK;
 967
 968                 // Ignore Modifer Keys
 969                 if(Codepoint > KEY_MODIFIERS)   return;
 970
 971                 // Get UTF-8/ANSI Encoding
 972                 switch(Codepoint)
 973                 {
 974                 // 0: No translation, don't send to user
 975                 case 0: break;
 976                 case KEY_LEFT:
 977                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'D';
 978                         len = 3;
 979                         break;
 980                 case KEY_RIGHT:
 981                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'C';
 982                         len = 3;
 983                         break;
 984                 case KEY_UP:
 985                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'A';
 986                         len = 3;
 987                         break;
 988                 case KEY_DOWN:
 989                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'B';
 990                         len = 3;
 991                         break;
 992
 993                 case KEY_PGUP:
 994                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = '5'; buf[3] = '~';
 995                         len = 4;
 996                         break;
 997                 case KEY_PGDOWN:
 998                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = '6'; buf[3] = '~';
 999                         len = 4;
1000                         break;
1001
1002                 // Attempt to encode in UTF-8
1003                 default:
1004                         len = WriteUTF8( buf, Codepoint );
1005                         if(len == 0) {
1006                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
1007                         }
1008                         break;
1009                 }
1010
1011                 if(len == 0) {
1012                         // Unprintable / Don't Pass
1013                         return;
1014                 }
1015
1016 #if 0
1017                 // Handle meta characters
1018                 if( !(term->Flags & VT_FLAG_RAWIN) )
1019                 {
1020                         switch(buf[0])
1021                         {
1022                         case '\3':      // ^C
1023
1024                                 break;
1025                         }
1026                 }
1027 #endif
1028
1029                 // Write
1030                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
1031                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
1032                 else {
1033                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
1034                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
1035                 }
1036                 // Roll the buffer over
1037                 term->InputWrite += len;
1038                 term->InputWrite %= MAX_INPUT_CHARS8;
1039                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
1040                         term->InputRead = term->InputWrite + 1;
1041                         term->InputRead %= MAX_INPUT_CHARS8;
1042                 }
1043         }
1044         else
1045         {
1046                 // Encode the raw key event
1047                 Uint32  *raw_in = (void*)term->InputBuffer;
1048                 raw_in[ term->InputWrite ] = Codepoint;
1049                 term->InputWrite ++;
1050                 term->InputWrite %= MAX_INPUT_CHARS32;
1051                 if(term->InputRead == term->InputWrite) {
1052                         term->InputRead ++;
1053                         term->InputRead %= MAX_INPUT_CHARS32;
1054                 }
1055         }
1056
1057         VFS_MarkAvaliable(&term->Node, 1);
1058 }
1059
1060 /**
1061  * \brief Clears a line in a virtual terminal
1062  * \param Term  Terminal to modify
1063  * \param Num   Line number to clear
1064  */
1065 void VT_int_ClearLine(tVTerm *Term, int Num)
1066 {
1067          int    i;
1068         tVT_Char        *cell;
1069
1070         if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )        return ;
1071
1072         cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1073         cell = &cell[ Num*Term->TextWidth ];
1074
1075         for( i = Term->TextWidth; i--; )
1076         {
1077                 cell[ i ].Ch = 0;
1078                 cell[ i ].Colour = Term->CurColour;
1079         }
1080 }
1081
1082 /**
1083  * \brief Handle a standard large escape code
1084  *
1085  * Handles any escape code of the form \x1B[n,...A where n is an integer
1086  * and A is any letter.
1087  */
1088 void VT_int_ParseEscape_StandardLarge(tVTerm *Term, char CmdChar, int argc, int *args)
1089 {
1090          int    tmp = 1;
1091         switch(CmdChar)
1092         {
1093         // Left
1094         case 'D':
1095                 tmp = -1;
1096         // Right
1097         case 'C':
1098                 if(argc == 1)   tmp *= args[0];
1099                 if( Term->Flags & VT_FLAG_ALTBUF )
1100                 {
1101                         if( (Term->AltWritePos + tmp) % Term->TextWidth == 0 ) {
1102                                 Term->AltWritePos -= Term->AltWritePos % Term->TextWidth;
1103                                 Term->AltWritePos += Term->TextWidth - 1;
1104                         }
1105                         else
1106                                 Term->AltWritePos += tmp;
1107                 }
1108                 else
1109                 {
1110                         if( (Term->WritePos + tmp) % Term->TextWidth == 0 ) {
1111                                 Term->WritePos -= Term->WritePos % Term->TextWidth;
1112                                 Term->WritePos += Term->TextWidth - 1;
1113                         }
1114                         else
1115                                 Term->WritePos += tmp;
1116                 }
1117                 break;
1118
1119         // Erase
1120         case 'J':
1121                 switch(args[0])
1122                 {
1123                 case 0: // Erase below
1124                         break;
1125                 case 1: // Erase above
1126                         break;
1127                 case 2: // Erase all
1128                         if( Term->Flags & VT_FLAG_ALTBUF )
1129                         {
1130                                  int    i = Term->TextHeight;
1131                                 while( i-- )    VT_int_ClearLine(Term, i);
1132                                 Term->AltWritePos = 0;
1133                                 VT_int_UpdateScreen(Term, 1);
1134                         }
1135                         else
1136                         {
1137                                  int    i = Term->TextHeight * (giVT_Scrollback + 1);
1138                                 while( i-- )    VT_int_ClearLine(Term, i);
1139                                 Term->WritePos = 0;
1140                                 Term->ViewPos = 0;
1141                                 VT_int_UpdateScreen(Term, 1);
1142                         }
1143                         break;
1144                 }
1145                 break;
1146
1147         // Erase in line
1148         case 'K':
1149                 switch(args[0])
1150                 {
1151                 case 0: // Erase to right
1152                         if( Term->Flags & VT_FLAG_ALTBUF )
1153                         {
1154                                  int    i, max;
1155                                 max = Term->Width - Term->AltWritePos % Term->Width;
1156                                 for( i = 0; i < max; i ++ )
1157                                         Term->AltBuf[Term->AltWritePos+i].Ch = 0;
1158                         }
1159                         else
1160                         {
1161                                  int    i, max;
1162                                 max = Term->Width - Term->WritePos % Term->Width;
1163                                 for( i = 0; i < max; i ++ )
1164                                         Term->Text[Term->WritePos+i].Ch = 0;
1165                         }
1166                         VT_int_UpdateScreen(Term, 0);
1167                         break;
1168                 case 1: // Erase to left
1169                         if( Term->Flags & VT_FLAG_ALTBUF )
1170                         {
1171                                  int    i = Term->AltWritePos % Term->Width;
1172                                 while( i -- )
1173                                         Term->AltBuf[Term->AltWritePos++].Ch = 0;
1174                         }
1175                         else
1176                         {
1177                                  int    i = Term->WritePos % Term->Width;
1178                                 while( i -- )
1179                                         Term->Text[Term->WritePos++].Ch = 0;
1180                         }
1181                         VT_int_UpdateScreen(Term, 0);
1182                         break;
1183                 case 2: // Erase all
1184                         if( Term->Flags & VT_FLAG_ALTBUF )
1185                         {
1186                                 VT_int_ClearLine(Term, Term->AltWritePos / Term->Width);
1187                         }
1188                         else
1189                         {
1190                                 VT_int_ClearLine(Term, Term->WritePos / Term->Width);
1191                         }
1192                         VT_int_UpdateScreen(Term, 0);
1193                         break;
1194                 }
1195                 break;
1196
1197         // Set cursor position
1198         case 'H':
1199                 if( Term->Flags & VT_FLAG_ALTBUF )
1200                         Term->AltWritePos = args[0] + args[1]*Term->TextWidth;
1201                 else
1202                         Term->WritePos = args[0] + args[1]*Term->TextWidth;
1203                 //Log_Debug("VTerm", "args = {%i, %i}", args[0], args[1]);
1204                 break;
1205
1206         // Scroll up `n` lines
1207         case 'S':
1208                 tmp = -1;
1209         // Scroll down `n` lines
1210         case 'T':
1211                 if(argc == 1)   tmp *= args[0];
1212                 if( Term->Flags & VT_FLAG_ALTBUF )
1213                         VT_int_ScrollText(Term, tmp);
1214                 else
1215                 {
1216                         if(Term->ViewPos/Term->TextWidth + tmp < 0)
1217                                 break;
1218                         if(Term->ViewPos/Term->TextWidth + tmp  > Term->TextHeight * (giVT_Scrollback + 1))
1219                                 break;
1220
1221                         Term->ViewPos += Term->TextWidth*tmp;
1222                 }
1223                 break;
1224
1225         // Set Font flags
1226         case 'm':
1227                 for( ; argc--; )
1228                 {
1229                          int    colour_idx;
1230                         // Flags
1231                         if( 0 <= args[argc] && args[argc] <= 8)
1232                         {
1233                                 switch(args[argc])
1234                                 {
1235                                 case 0: Term->CurColour = DEFAULT_COLOUR;       break;  // Reset
1236                                 case 1: Term->CurColour |= 0x80000000;  break;  // Bright
1237                                 case 2: Term->CurColour &= ~0x80000000; break;  // Dim
1238                                 }
1239                         }
1240                         // Foreground Colour
1241                         else if(30 <= args[argc] && args[argc] <= 37) {
1242                                 // Get colour index, accounting for bright bit
1243                                 colour_idx = args[argc]-30 + ((Term->CurColour>>28) & 8);
1244                                 Term->CurColour &= 0x8000FFFF;
1245                                 Term->CurColour |= (Uint32)caVT100Colours[ colour_idx ] << 16;
1246                         }
1247                         // Background Colour
1248                         else if(40 <= args[argc] && args[argc] <= 47) {
1249                                 // Get colour index, accounting for bright bit
1250                                 colour_idx = args[argc]-40 + ((Term->CurColour>>12) & 8);
1251                                 Term->CurColour &= 0xFFFF8000;
1252                                 Term->CurColour |= caVT100Colours[ colour_idx ];
1253                         }
1254                         else {
1255                                 Log_Warning("VTerm", "Unknown font flag %i", args[argc]);
1256                         }
1257                 }
1258                 break;
1259
1260         // Set scrolling region
1261         case 'r':
1262                 if( argc != 2 ) break;
1263                 Term->ScrollTop = args[0];
1264                 Term->ScrollHeight = args[1] - args[0];
1265                 break;
1266
1267         default:
1268                 Log_Warning("VTerm", "Unknown control sequence '\\x1B[%c'", CmdChar);
1269                 break;
1270         }
1271 }
1272
1273 /**
1274  * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
1275  * \brief Parses a VT100 Escape code
1276  */
1277 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
1278 {
1279         char    c;
1280          int    argc = 0, j = 1;
1281          int    args[6] = {0,0,0,0};
1282          int    bQuestionMark = 0;
1283
1284         switch(Buffer[0])
1285         {
1286         //Large Code
1287         case '[':
1288                 // Get Arguments
1289                 c = Buffer[j++];
1290                 if(c == '?') {
1291                         bQuestionMark = 1;
1292                         c = Buffer[j++];
1293                 }
1294                 if( '0' <= c && c <= '9' )
1295                 {
1296                         do {
1297                                 if(c == ';')    c = Buffer[j++];
1298                                 while('0' <= c && c <= '9') {
1299                                         args[argc] *= 10;
1300                                         args[argc] += c-'0';
1301                                         c = Buffer[j++];
1302                                 }
1303                                 argc ++;
1304                         } while(c == ';');
1305                 }
1306
1307                 // Get Command
1308                 if( ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
1309                 {
1310                         if( bQuestionMark )
1311                         {
1312                                 switch(c)
1313                                 {
1314                                 // DEC Private Mode Set
1315                                 case 'h':
1316                                         if(argc != 1)   break;
1317                                         switch(args[0])
1318                                         {
1319                                         case 1047:
1320                                                 VT_int_ToggleAltBuffer(Term, 1);
1321                                                 break;
1322                                         }
1323                                         break;
1324                                 case 'l':
1325                                         if(argc != 1)   break;
1326                                         switch(args[0])
1327                                         {
1328                                         case 1047:
1329                                                 VT_int_ToggleAltBuffer(Term, 0);
1330                                                 break;
1331                                         }
1332                                         break;
1333                                 default:
1334                                         Log_Warning("VTerm", "Unknown control sequence '\\x1B[?%c'", c);
1335                                         break;
1336                                 }
1337                         }
1338                         else
1339                         {
1340                                 VT_int_ParseEscape_StandardLarge(Term, c, argc, args);
1341                         }
1342                 }
1343                 break;
1344
1345         default:
1346                 Log_Notice("VTerm", "TODO: Handle short escape codes");
1347                 break;
1348         }
1349
1350         //Log_Debug("VTerm", "j = %i, Buffer = '%s'", j, Buffer);
1351         return j;
1352 }
1353
1354 /**
1355  * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1356  * \brief Print a string to the Virtual Terminal
1357  */
1358 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1359 {
1360         Uint32  val;
1361          int    i;
1362
1363         // Iterate
1364         for( i = 0; i < Count; i++ )
1365         {
1366                 // Handle escape sequences
1367                 if( Buffer[i] == 0x1B )
1368                 {
1369                         i ++;
1370                         i += VT_int_ParseEscape(Term, (char*)&Buffer[i]) - 1;
1371                         continue;
1372                 }
1373
1374                 // Fast check for non UTF-8
1375                 if( Buffer[i] < 128 )   // Plain ASCII
1376                         VT_int_PutChar(Term, Buffer[i]);
1377                 else {  // UTF-8
1378                         i += ReadUTF8(&Buffer[i], &val) - 1;
1379                         VT_int_PutChar(Term, val);
1380                 }
1381         }
1382         // Update Screen
1383         VT_int_UpdateScreen( Term, 0 );
1384 }
1385
1386 /**
1387  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1388  * \brief Write a single character to a VTerm
1389  */
1390 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1391 {
1392          int    i;
1393         tVT_Char        *buffer;
1394          int    write_pos;
1395
1396         if(Term->Flags & VT_FLAG_ALTBUF) {
1397                 buffer = Term->AltBuf;
1398                 write_pos = Term->AltWritePos;
1399         }
1400         else {
1401                 buffer = Term->Text;
1402                 write_pos = Term->WritePos;
1403         }
1404
1405         switch(Ch)
1406         {
1407         case '\0':      return; // Ignore NULL byte
1408         case '\n':
1409                 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
1410                 write_pos += Term->TextWidth;
1411         case '\r':
1412                 write_pos -= write_pos % Term->TextWidth;
1413                 break;
1414
1415         case '\t': { int tmp = write_pos / Term->TextWidth;
1416                 write_pos %= Term->TextWidth;
1417                 do {
1418                         buffer[ write_pos ].Ch = '\0';
1419                         buffer[ write_pos ].Colour = Term->CurColour;
1420                         write_pos ++;
1421                 } while(write_pos & 7);
1422                 write_pos += tmp * Term->TextWidth;
1423                 break; }
1424
1425         case '\b':
1426                 // Backspace is invalid at Offset 0
1427                 if(write_pos == 0)      break;
1428
1429                 write_pos --;
1430                 // Singe Character
1431                 if(buffer[ write_pos ].Ch != '\0') {
1432                         buffer[ write_pos ].Ch = 0;
1433                         buffer[ write_pos ].Colour = Term->CurColour;
1434                         break;
1435                 }
1436                 // Tab
1437                 i = 7;  // Limit it to 8
1438                 do {
1439                         buffer[ write_pos ].Ch = 0;
1440                         buffer[ write_pos ].Colour = Term->CurColour;
1441                         write_pos --;
1442                 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
1443                 if(buffer[ write_pos ].Ch != '\0')
1444                         write_pos ++;
1445                 break;
1446
1447         default:
1448                 buffer[ write_pos ].Ch = Ch;
1449                 buffer[ write_pos ].Colour = Term->CurColour;
1450                 // Update the line before wrapping
1451                 if( (write_pos + 1) % Term->TextWidth == 0 )
1452                         VT_int_UpdateScreen( Term, 0 );
1453                 write_pos ++;
1454                 break;
1455         }
1456
1457         if(Term->Flags & VT_FLAG_ALTBUF)
1458         {
1459                 Term->AltBuf = buffer;
1460                 Term->AltWritePos = write_pos;
1461
1462                 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
1463                 {
1464                         Term->AltWritePos -= Term->TextWidth;
1465                         VT_int_ScrollText(Term, 1);
1466                 }
1467
1468         }
1469         else
1470         {
1471                 Term->Text = buffer;
1472                 Term->WritePos = write_pos;
1473                 // Move Screen
1474                 // - Check if we need to scroll the entire scrollback buffer
1475                 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
1476                 {
1477                          int    base;
1478
1479                         // Update previous line
1480                         Term->WritePos -= Term->TextWidth;
1481                         VT_int_UpdateScreen( Term, 0 );
1482
1483                         // Update view position
1484                         base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
1485                         if(Term->ViewPos < base)
1486                                 Term->ViewPos += Term->Width;
1487                         if(Term->ViewPos > base)
1488                                 Term->ViewPos = base;
1489
1490                         VT_int_ScrollText(Term, 1);
1491                 }
1492                 // Ok, so we only need to scroll the screen
1493                 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
1494                 {
1495                         // Update the last line
1496                         Term->WritePos -= Term->TextWidth;
1497                         VT_int_UpdateScreen( Term, 0 );
1498                         Term->WritePos += Term->TextWidth;
1499
1500                         VT_int_ScrollText(Term, 1);
1501
1502                         Term->ViewPos += Term->TextWidth;
1503                 }
1504         }
1505
1506         //LEAVE('-');
1507 }
1508
1509 void VT_int_ScrollText(tVTerm *Term, int Count)
1510 {
1511         tVT_Char        *buf;
1512          int    height, init_write_pos;
1513          int    len, i;
1514          int    scroll_top, scroll_height;
1515
1516         // Get buffer pointer and attributes
1517         if( Term->Flags & VT_FLAG_ALTBUF )
1518         {
1519                 buf = Term->AltBuf;
1520                 height = Term->TextHeight;
1521                 init_write_pos = Term->AltWritePos;
1522                 scroll_top = Term->ScrollTop;
1523                 scroll_height = Term->ScrollHeight;
1524         }
1525         else
1526         {
1527                 buf = Term->Text;
1528                 height = Term->TextHeight*(giVT_Scrollback+1);
1529                 init_write_pos = Term->WritePos;
1530                 scroll_top = 0;
1531                 scroll_height = height;
1532         }
1533
1534         // Scroll text downwards
1535         if( Count > 0 )
1536         {
1537                  int    base;
1538
1539                 // Set up
1540                 if(Count > scroll_height)       Count = scroll_height;
1541                 base = Term->TextWidth*(scroll_top + scroll_height - Count);
1542                 len = Term->TextWidth*(scroll_height - Count);
1543
1544                 // Scroll terminal cache
1545                 memmove(
1546                         &buf[Term->TextWidth*scroll_top],
1547                         &buf[Term->TextWidth*(scroll_top+Count)],
1548                         len*sizeof(tVT_Char)
1549                         );
1550                 // Clear last rows
1551                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1552                 {
1553                         buf[ base + i ].Ch = 0;
1554                         buf[ base + i ].Colour = Term->CurColour;
1555                 }
1556
1557                 // Update Screen
1558                 VT_int_ScrollFramebuffer( Term, Count );
1559                 if( Term->Flags & VT_FLAG_ALTBUF )
1560                         Term->AltWritePos = base;
1561                 else
1562                         Term->WritePos = Term->ViewPos + Term->TextWidth*(Term->TextHeight - Count);
1563                 for( i = 0; i < Count; i ++ )
1564                 {
1565                         VT_int_UpdateScreen( Term, 0 );
1566                         if( Term->Flags & VT_FLAG_ALTBUF )
1567                                 Term->AltWritePos += Term->TextWidth;
1568                         else
1569                                 Term->WritePos += Term->TextWidth;
1570                 }
1571         }
1572         else
1573         {
1574                 Count = -Count;
1575                 if(Count > scroll_height)       Count = scroll_height;
1576
1577                 len = Term->TextWidth*(scroll_height - Count);
1578
1579                 // Scroll terminal cache
1580                 memmove(
1581                         &buf[Term->TextWidth*(scroll_top+Count)],
1582                         &buf[Term->TextWidth*scroll_top],
1583                         len*sizeof(tVT_Char)
1584                         );
1585                 // Clear preceding rows
1586                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1587                 {
1588                         buf[ i ].Ch = 0;
1589                         buf[ i ].Colour = Term->CurColour;
1590                 }
1591
1592                 VT_int_ScrollFramebuffer( Term, -Count );
1593                 if( Term->Flags & VT_FLAG_ALTBUF )
1594                         Term->AltWritePos = Term->TextWidth*scroll_top;
1595                 else
1596                         Term->WritePos = Term->ViewPos;
1597                 for( i = 0; i < Count; i ++ )
1598                 {
1599                         VT_int_UpdateScreen( Term, 0 );
1600                         if( Term->Flags & VT_FLAG_ALTBUF )
1601                                 Term->AltWritePos += Term->TextWidth;
1602                         else
1603                                 Term->WritePos += Term->TextWidth;
1604                 }
1605         }
1606
1607         if( Term->Flags & VT_FLAG_ALTBUF )
1608                 Term->AltWritePos = init_write_pos;
1609         else
1610                 Term->WritePos = init_write_pos;
1611 }
1612
1613 /**
1614  * \fn void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1615  * \note Scrolls the framebuffer down by \a Count text lines
1616  */
1617 void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1618 {
1619          int    tmp;
1620         struct {
1621                 Uint8   Op;
1622                 Uint16  DstX, DstY;
1623                 Uint16  SrcX, SrcY;
1624                 Uint16  W, H;
1625         } PACKED        buf;
1626
1627         // Only update if this is the current terminal
1628         if( Term != gpVT_CurTerm )      return;
1629
1630         if( Count > Term->ScrollHeight )        Count = Term->ScrollHeight;
1631         if( Count < -Term->ScrollHeight )       Count = -Term->ScrollHeight;
1632
1633         // Switch to 2D Command Stream
1634         tmp = VIDEO_BUFFMT_2DSTREAM;
1635         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1636
1637         // BLIT to 0,0 from 0,giVT_CharHeight
1638         buf.Op = VIDEO_2DOP_BLIT;
1639         buf.SrcX = 0;   buf.DstX = 0;
1640         // TODO: Don't assume character dimensions
1641         buf.W = Term->TextWidth * giVT_CharWidth;
1642         if( Count > 0 )
1643         {
1644                 buf.SrcY = (Term->ScrollTop+Count) * giVT_CharHeight;
1645                 buf.DstY = Term->ScrollTop * giVT_CharHeight;
1646         }
1647         else    // Scroll up, move text down
1648         {
1649                 Count = -Count;
1650                 buf.SrcY = Term->ScrollTop * giVT_CharHeight;
1651                 buf.DstY = (Term->ScrollTop+Count) * giVT_CharHeight;
1652         }
1653         buf.H = (Term->ScrollHeight-Count) * giVT_CharHeight;
1654         VFS_WriteAt(giVT_OutputDevHandle, 0, sizeof(buf), &buf);
1655
1656         // Restore old mode (this function is only called during text mode)
1657         tmp = VIDEO_BUFFMT_TEXT;
1658         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1659 }
1660
1661 void VT_int_UpdateCursor( tVTerm *Term, int bShow )
1662 {
1663         tVideo_IOCtl_Pos        csr_pos;
1664
1665         if( Term != gpVT_CurTerm )      return ;
1666
1667         if( !bShow )
1668         {
1669                 csr_pos.x = -1;
1670                 csr_pos.y = -1;
1671         }
1672         else if( Term->Mode == TERM_MODE_TEXT )
1673         {
1674                  int    offset;
1675
1676 //              if( !(Term->Flags & VT_FLAG_SHOWCSR)
1677 //               && ( (Term->Flags & VT_FLAG_HIDECSR) || !Term->Node.ReadThreads)
1678 //                )
1679                 if( !Term->Text || Term->Flags & VT_FLAG_HIDECSR )
1680                 {
1681                         csr_pos.x = -1;
1682                         csr_pos.y = -1;
1683                 }
1684                 else
1685                 {
1686                         if(Term->Flags & VT_FLAG_ALTBUF)
1687                                 offset = Term->AltWritePos;
1688                         else
1689                                 offset = Term->WritePos - Term->ViewPos;
1690
1691                         csr_pos.x = offset % Term->TextWidth;
1692                         csr_pos.y = offset / Term->TextWidth;
1693                         if( 0 > csr_pos.y || csr_pos.y >= Term->TextHeight )
1694                                 csr_pos.y = -1, csr_pos.x = -1;
1695                 }
1696         }
1697         else
1698         {
1699                 csr_pos.x = Term->VideoCursorX;
1700                 csr_pos.y = Term->VideoCursorY;
1701         }
1702         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &csr_pos);
1703 }
1704
1705 /**
1706  * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1707  * \brief Updates the video framebuffer
1708  */
1709 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1710 {
1711         tVT_Char        *buffer;
1712          int    view_pos, write_pos;
1713         // Only update if this is the current terminal
1714         if( Term != gpVT_CurTerm )      return;
1715
1716         switch( Term->Mode )
1717         {
1718         case TERM_MODE_TEXT:
1719                 view_pos = (Term->Flags & VT_FLAG_ALTBUF) ? 0 : Term->ViewPos;
1720                 write_pos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
1721                 buffer = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1722                 // Re copy the entire screen?
1723                 if(UpdateAll) {
1724                         VFS_WriteAt(
1725                                 giVT_OutputDevHandle,
1726                                 0,
1727                                 Term->TextWidth*Term->TextHeight*sizeof(tVT_Char),
1728                                 &buffer[view_pos]
1729                                 );
1730                 }
1731                 // Only copy the current line
1732                 else {
1733                          int    ofs = write_pos - write_pos % Term->TextWidth;
1734                         VFS_WriteAt(
1735                                 giVT_OutputDevHandle,
1736                                 (ofs - view_pos)*sizeof(tVT_Char),
1737                                 Term->TextWidth*sizeof(tVT_Char),
1738                                 &buffer[ofs]
1739                                 );
1740                 }
1741                 break;
1742         case TERM_MODE_FB:
1743                 break;
1744         }
1745
1746         VT_int_UpdateCursor(Term, 1);
1747 }
1748
1749 /**
1750  * \brief Update the screen mode
1751  * \param Term  Terminal to update
1752  * \param NewMode       New mode to set
1753  * \param NewWidth      New framebuffer width
1754  * \param NewHeight     New framebuffer height
1755  */
1756 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
1757 {
1758          int    oldW = Term->Width;
1759          int    oldTW = Term->TextWidth;
1760          int    oldH = Term->Height;
1761          int    oldTH = Term->TextHeight;
1762         tVT_Char        *oldTBuf = Term->Text;
1763         Uint32  *oldFB = Term->Buffer;
1764          int    w, h, i;
1765
1766         // TODO: Increase RealWidth/RealHeight when this happens
1767         if(NewWidth > giVT_RealWidth)   NewWidth = giVT_RealWidth;
1768         if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
1769
1770         Term->Mode = NewMode;
1771
1772         // Fast exit if no resolution change
1773         if(NewWidth == Term->Width && NewHeight == Term->Height)
1774                 return ;
1775
1776         // Calculate new dimensions
1777         Term->Width = NewWidth;
1778         Term->Height = NewHeight;
1779         Term->TextWidth = NewWidth / giVT_CharWidth;
1780         Term->TextHeight = NewHeight / giVT_CharHeight;
1781         Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
1782
1783         // Allocate new buffers
1784         // - Text
1785         Term->Text = calloc(
1786                 Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
1787                 sizeof(tVT_Char)
1788                 );
1789         if(oldTBuf) {
1790                 // Copy old buffer
1791                 w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
1792                 h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
1793                 h *= giVT_Scrollback + 1;
1794                 for( i = 0; i < h; i ++ )
1795                 {
1796                         memcpy(
1797                                 &Term->Text[i*Term->TextWidth],
1798                                 &oldTBuf[i*oldTW],
1799                                 w*sizeof(tVT_Char)
1800                                 );
1801                 }
1802                 free(oldTBuf);
1803         }
1804
1805         // - Alternate Text
1806         Term->AltBuf = realloc(
1807                 Term->AltBuf,
1808                 Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
1809                 );
1810
1811         // - Framebuffer
1812         if(oldFB) {
1813                 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
1814                 // Copy old buffer
1815                 w = (oldW > Term->Width) ? Term->Width : oldW;
1816                 h = (oldH > Term->Height) ? Term->Height : oldH;
1817                 for( i = 0; i < h; i ++ )
1818                 {
1819                         memcpy(
1820                                 &Term->Buffer[i*Term->Width],
1821                                 &oldFB[i*oldW],
1822                                 w*sizeof(Uint32)
1823                                 );
1824                 }
1825                 free(oldFB);
1826         }
1827
1828         // Debug
1829         switch(NewMode)
1830         {
1831         case TERM_MODE_TEXT:
1832                 Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
1833                         Term, Term->TextWidth, Term->TextHeight);
1834                 break;
1835         case TERM_MODE_FB:
1836                 Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
1837                         Term, Term->Width, Term->Height);
1838                 break;
1839         //case TERM_MODE_2DACCEL:
1840         //case TERM_MODE_3DACCEL:
1841         //      return;
1842         }
1843 }
1844
1845
1846 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
1847 {
1848         if(Enabled)
1849                 Term->Flags |= VT_FLAG_ALTBUF;
1850         else
1851                 Term->Flags &= ~VT_FLAG_ALTBUF;
1852         VT_int_UpdateScreen(Term, 1);
1853 }
1854
1855 // ---
1856 // Font Render
1857 // ---
1858 #define MONOSPACE_FONT  10816
1859
1860 #if MONOSPACE_FONT == 10808     // 8x8
1861 # include "vterm_font_8x8.h"
1862 #elif MONOSPACE_FONT == 10816   // 8x16
1863 # include "vterm_font_8x16.h"
1864 #endif
1865
1866 // === PROTOTYPES ===
1867 Uint8   *VT_Font_GetChar(Uint32 Codepoint);
1868
1869 // === GLOBALS ===
1870 int     giVT_CharWidth = FONT_WIDTH;
1871 int     giVT_CharHeight = FONT_HEIGHT;
1872
1873 // === CODE ===
1874 /**
1875  * \brief Render a font character
1876  */
1877 void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC)
1878 {
1879         Uint8   *font;
1880          int    x, y;
1881
1882         // 8-bpp and below
1883         if( Depth <= 8 )
1884         {
1885                 Uint8   *buf = Buffer;
1886
1887                 font = VT_Font_GetChar(Codepoint);
1888
1889                 for(y = 0; y < FONT_HEIGHT; y ++)
1890                 {
1891                         for(x = 0; x < FONT_WIDTH; x ++)
1892                         {
1893                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1894                                         buf[x] = FGC;
1895                                 else
1896                                         buf[x] = BGC;
1897                         }
1898                         buf = (void*)( (tVAddr)buf + Pitch );
1899                         font ++;
1900                 }
1901         }
1902         // 16-bpp and below
1903         else if( Depth <= 16 )
1904         {
1905                 Uint16  *buf = Buffer;
1906
1907                 font = VT_Font_GetChar(Codepoint);
1908
1909                 for(y = 0; y < FONT_HEIGHT; y ++)
1910                 {
1911                         for(x = 0; x < FONT_WIDTH; x ++)
1912                         {
1913                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1914                                         buf[x] = FGC;
1915                                 else
1916                                         buf[x] = BGC;
1917                         }
1918                         buf = (void*)( (tVAddr)buf + Pitch );
1919                         font ++;
1920                 }
1921         }
1922         // 24-bpp colour
1923         // - Special handling to not overwrite the next pixel
1924         //TODO: Endian issues here
1925         else if( Depth == 24 )
1926         {
1927                 Uint8   *buf = Buffer;
1928                 Uint8   bg_r = (BGC >> 16) & 0xFF;
1929                 Uint8   bg_g = (BGC >>  8) & 0xFF;
1930                 Uint8   bg_b = (BGC >>  0) & 0xFF;
1931                 Uint8   fg_r = (FGC >> 16) & 0xFF;
1932                 Uint8   fg_g = (FGC >>  8) & 0xFF;
1933                 Uint8   fg_b = (FGC >>  0) & 0xFF;
1934
1935                 font = VT_Font_GetChar(Codepoint);
1936
1937                 for(y = 0; y < FONT_HEIGHT; y ++)
1938                 {
1939                         for(x = 0; x < FONT_WIDTH; x ++)
1940                         {
1941                                 Uint8   r, g, b;
1942
1943                                 if(*font & (1 << (FONT_WIDTH-x-1))) {
1944                                         r = fg_r;       g = fg_g;       b = fg_b;
1945                                 }
1946                                 else {
1947                                         r = bg_r;       g = bg_g;       b = bg_b;
1948                                 }
1949                                 buf[x*3+0] = b;
1950                                 buf[x*3+1] = g;
1951                                 buf[x*3+2] = r;
1952                         }
1953                         buf = (void*)( (tVAddr)buf + Pitch );
1954                         font ++;
1955                 }
1956         }
1957         // 32-bpp colour (nice and easy)
1958         else if( Depth == 32 )
1959         {
1960                 Uint32  *buf = Buffer;
1961
1962                 font = VT_Font_GetChar(Codepoint);
1963
1964                 for(y = 0; y < FONT_HEIGHT; y ++)
1965                 {
1966                         for(x = 0; x < FONT_WIDTH; x ++)
1967                         {
1968                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1969                                         buf[x] = FGC;
1970                                 else
1971                                         buf[x] = BGC;
1972                         }
1973                         buf = (Uint32*)( (tVAddr)buf + Pitch );
1974                         font ++;
1975                 }
1976         }
1977 }
1978
1979 /**
1980  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
1981  * \brief Converts a 12-bit colour into 24 bits
1982  */
1983 Uint32 VT_Colour12to24(Uint16 Col12)
1984 {
1985         Uint32  ret;
1986          int    tmp;
1987         tmp = Col12 & 0xF;
1988         ret  = (tmp << 0) | (tmp << 4);
1989         tmp = (Col12 & 0xF0) >> 4;
1990         ret |= (tmp << 8) | (tmp << 12);
1991         tmp = (Col12 & 0xF00) >> 8;
1992         ret |= (tmp << 16) | (tmp << 20);
1993         return ret;
1994 }
1995 /**
1996  * \brief Converts a 12-bit colour into 15 bits
1997  */
1998 Uint16 VT_Colour12to15(Uint16 Col12)
1999 {
2000         Uint32  ret;
2001          int    tmp;
2002         tmp = Col12 & 0xF;
2003         ret  = (tmp << 1) | (tmp & 1);
2004         tmp = (Col12 & 0xF0) >> 4;
2005         ret |= ( (tmp << 1) | (tmp & 1) ) << 5;
2006         tmp = (Col12 & 0xF00) >> 8;
2007         ret |= ( (tmp << 1) | (tmp & 1) ) << 10;
2008         return ret;
2009 }
2010
2011 /**
2012  * \brief Converts a 12-bit colour into any other depth
2013  * \param Col12 12-bit source colour
2014  * \param Depth Desired bit deptj
2015  * \note Green then blue get the extra avaliable bits (16:5-6-5, 14:4-5-5)
2016  */
2017 Uint32 VT_Colour12toN(Uint16 Col12, int Depth)
2018 {
2019         Uint32  ret;
2020         Uint32  r, g, b;
2021          int    rSize, gSize, bSize;
2022
2023         // Fast returns
2024         if( Depth == 24 )       return VT_Colour12to24(Col12);
2025         if( Depth == 15 )       return VT_Colour12to15(Col12);
2026         // - 32 is a special case, it's usually 24-bit colour with an unused byte
2027         if( Depth == 32 )       return VT_Colour12to24(Col12);
2028
2029         // Bounds checks
2030         if( Depth < 8 ) return 0;
2031         if( Depth > 32 )        return 0;
2032
2033         r = Col12 & 0xF;
2034         g = (Col12 & 0xF0) >> 4;
2035         b = (Col12 & 0xF00) >> 8;
2036
2037         rSize = gSize = bSize = Depth / 3;
2038         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 1
2039                 gSize ++;
2040         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 2
2041                 bSize ++;
2042
2043         // Expand
2044         r <<= rSize - 4;        g <<= gSize - 4;        b <<= bSize - 4;
2045         // Fill with the lowest bit
2046         if( Col12 & 0x001 )     r |= (1 << (rSize - 4)) - 1;
2047         if( Col12 & 0x010 )     r |= (1 << (gSize - 4)) - 1;
2048         if( Col12 & 0x100 )     r |= (1 << (bSize - 4)) - 1;
2049
2050         // Create output
2051         ret  = r;
2052         ret |= g << rSize;
2053         ret |= b << (rSize + gSize);
2054
2055         return ret;
2056 }
2057
2058 /**
2059  * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
2060  * \brief Gets an index into the font array given a Unicode Codepoint
2061  * \note See http://en.wikipedia.org/wiki/CP437
2062  */
2063 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
2064 {
2065          int    index = 0;
2066         if(Codepoint < 128)
2067                 return &VTermFont[Codepoint*FONT_HEIGHT];
2068         switch(Codepoint)
2069         {
2070         case 0xC7:      index = 128;    break;  // Ç
2071         case 0xFC:      index = 129;    break;  // ü
2072         case 0xE9:      index = 130;    break;  // é
2073         case 0xE2:      index = 131;    break;  // â
2074         case 0xE4:      index = 132;    break;  // ä
2075         case 0xE0:      index = 133;    break;  // à
2076         case 0xE5:      index = 134;    break;  // å
2077         case 0xE7:      index = 135;    break;  // ç
2078         case 0xEA:      index = 136;    break;  // ê
2079         case 0xEB:      index = 137;    break;  // ë
2080         case 0xE8:      index = 138;    break;  // è
2081         case 0xEF:      index = 139;    break;  // ï
2082         case 0xEE:      index = 140;    break;  // î
2083         case 0xEC:      index = 141;    break;  // ì
2084         case 0xC4:      index = 142;    break;  // Ä
2085         case 0xC5:      index = 143;    break;  // Å
2086         }
2087
2088         return &VTermFont[index*FONT_HEIGHT];
2089 }
2090
2091 EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
2092 EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
2093 EXPORT(VT_Font_Render);
2094 EXPORT(VT_Colour12to24);