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         // Catch VT binds
 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                 }
 932
 933                 // Scrolling is only valid in text mode
 934                 if(gpVT_CurTerm->Mode != TERM_MODE_TEXT)
 935                         break;
 936
 937                 switch(Codepoint & KEY_CODEPOINT_MASK)
 938                 {
 939                 // Scrolling
 940                 case KEY_PGUP:
 941                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 942                                 return ;
 943                         gpVT_CurTerm->ViewPos = MAX(
 944                                 0,
 945                                 gpVT_CurTerm->ViewPos - gpVT_CurTerm->Width
 946                                 );
 947                         return;
 948                 case KEY_PGDOWN:
 949                         if( gpVT_CurTerm->Flags & VT_FLAG_ALTBUF )
 950                                 return ;
 951                         gpVT_CurTerm->ViewPos = MIN(
 952                                 gpVT_CurTerm->ViewPos + gpVT_CurTerm->Width,
 953                                 gpVT_CurTerm->Width * gpVT_CurTerm->Height*giVT_Scrollback
 954                                 );
 955                         return;
 956                 }
 957                 break;
 958         }
 959
 960         // Encode key
 961         if(term->Mode == TERM_MODE_TEXT)
 962         {
 963                 Uint8   buf[6] = {0};
 964                  int    len = 0;
 965
 966                 // Ignore anything that isn't a press or refire
 967                 if( (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_PRESS
 968                  && (Codepoint & KEY_ACTION_MASK) != KEY_ACTION_REFIRE
 969                     )
 970                 {
 971                         return ;
 972                 }
 973
 974                 Codepoint &= KEY_CODEPOINT_MASK;
 975
 976                 // Ignore Modifer Keys
 977                 if(Codepoint > KEY_MODIFIERS)   return;
 978
 979                 // Get UTF-8/ANSI Encoding
 980                 switch(Codepoint)
 981                 {
 982                 // 0: No translation, don't send to user
 983                 case 0: break;
 984                 case KEY_LEFT:
 985                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'D';
 986                         len = 3;
 987                         break;
 988                 case KEY_RIGHT:
 989                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'C';
 990                         len = 3;
 991                         break;
 992                 case KEY_UP:
 993                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'A';
 994                         len = 3;
 995                         break;
 996                 case KEY_DOWN:
 997                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = 'B';
 998                         len = 3;
 999                         break;
1000
1001                 case KEY_PGUP:
1002                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = '5'; buf[3] = '~';
1003                         len = 4;
1004                         break;
1005                 case KEY_PGDOWN:
1006                         buf[0] = '\x1B'; buf[1] = '['; buf[2] = '6'; buf[3] = '~';
1007                         len = 4;
1008                         break;
1009
1010                 // Attempt to encode in UTF-8
1011                 default:
1012                         len = WriteUTF8( buf, Codepoint );
1013                         if(len == 0) {
1014                                 Warning("Codepoint (%x) is unrepresentable in UTF-8", Codepoint);
1015                         }
1016                         break;
1017                 }
1018
1019                 if(len == 0) {
1020                         // Unprintable / Don't Pass
1021                         return;
1022                 }
1023
1024 #if 0
1025                 // Handle meta characters
1026                 if( !(term->Flags & VT_FLAG_RAWIN) )
1027                 {
1028                         switch(buf[0])
1029                         {
1030                         case '\3':      // ^C
1031
1032                                 break;
1033                         }
1034                 }
1035 #endif
1036
1037                 // Write
1038                 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
1039                         memcpy( &term->InputBuffer[term->InputWrite], buf, len );
1040                 else {
1041                         memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
1042                         memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
1043                 }
1044                 // Roll the buffer over
1045                 term->InputWrite += len;
1046                 term->InputWrite %= MAX_INPUT_CHARS8;
1047                 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
1048                         term->InputRead = term->InputWrite + 1;
1049                         term->InputRead %= MAX_INPUT_CHARS8;
1050                 }
1051         }
1052         else
1053         {
1054                 // Encode the raw key event
1055                 Uint32  *raw_in = (void*)term->InputBuffer;
1056                 raw_in[ term->InputWrite ] = Codepoint;
1057                 term->InputWrite ++;
1058                 term->InputWrite %= MAX_INPUT_CHARS32;
1059                 if(term->InputRead == term->InputWrite) {
1060                         term->InputRead ++;
1061                         term->InputRead %= MAX_INPUT_CHARS32;
1062                 }
1063         }
1064
1065         VFS_MarkAvaliable(&term->Node, 1);
1066 }
1067
1068 /**
1069  * \brief Clears a line in a virtual terminal
1070  * \param Term  Terminal to modify
1071  * \param Num   Line number to clear
1072  */
1073 void VT_int_ClearLine(tVTerm *Term, int Num)
1074 {
1075          int    i;
1076         tVT_Char        *cell;
1077
1078         if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )        return ;
1079
1080         cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1081         cell = &cell[ Num*Term->TextWidth ];
1082
1083         for( i = Term->TextWidth; i--; )
1084         {
1085                 cell[ i ].Ch = 0;
1086                 cell[ i ].Colour = Term->CurColour;
1087         }
1088 }
1089
1090 /**
1091  * \brief Handle a standard large escape code
1092  *
1093  * Handles any escape code of the form \x1B[n,...A where n is an integer
1094  * and A is any letter.
1095  */
1096 void VT_int_ParseEscape_StandardLarge(tVTerm *Term, char CmdChar, int argc, int *args)
1097 {
1098          int    tmp = 1;
1099         switch(CmdChar)
1100         {
1101         // Left
1102         case 'D':
1103                 tmp = -1;
1104         // Right
1105         case 'C':
1106                 if(argc == 1)   tmp *= args[0];
1107                 if( Term->Flags & VT_FLAG_ALTBUF )
1108                 {
1109                         if( (Term->AltWritePos + tmp) % Term->TextWidth == 0 ) {
1110                                 Term->AltWritePos -= Term->AltWritePos % Term->TextWidth;
1111                                 Term->AltWritePos += Term->TextWidth - 1;
1112                         }
1113                         else
1114                                 Term->AltWritePos += tmp;
1115                 }
1116                 else
1117                 {
1118                         if( (Term->WritePos + tmp) % Term->TextWidth == 0 ) {
1119                                 Term->WritePos -= Term->WritePos % Term->TextWidth;
1120                                 Term->WritePos += Term->TextWidth - 1;
1121                         }
1122                         else
1123                                 Term->WritePos += tmp;
1124                 }
1125                 break;
1126
1127         // Erase
1128         case 'J':
1129                 switch(args[0])
1130                 {
1131                 case 0: // Erase below
1132                         break;
1133                 case 1: // Erase above
1134                         break;
1135                 case 2: // Erase all
1136                         if( Term->Flags & VT_FLAG_ALTBUF )
1137                         {
1138                                  int    i = Term->TextHeight;
1139                                 while( i-- )    VT_int_ClearLine(Term, i);
1140                                 Term->AltWritePos = 0;
1141                                 VT_int_UpdateScreen(Term, 1);
1142                         }
1143                         else
1144                         {
1145                                  int    i = Term->TextHeight * (giVT_Scrollback + 1);
1146                                 while( i-- )    VT_int_ClearLine(Term, i);
1147                                 Term->WritePos = 0;
1148                                 Term->ViewPos = 0;
1149                                 VT_int_UpdateScreen(Term, 1);
1150                         }
1151                         break;
1152                 }
1153                 break;
1154
1155         // Erase in line
1156         case 'K':
1157                 switch(args[0])
1158                 {
1159                 case 0: // Erase to right
1160                         if( Term->Flags & VT_FLAG_ALTBUF )
1161                         {
1162                                  int    i, max;
1163                                 max = Term->Width - Term->AltWritePos % Term->Width;
1164                                 for( i = 0; i < max; i ++ )
1165                                         Term->AltBuf[Term->AltWritePos+i].Ch = 0;
1166                         }
1167                         else
1168                         {
1169                                  int    i, max;
1170                                 max = Term->Width - Term->WritePos % Term->Width;
1171                                 for( i = 0; i < max; i ++ )
1172                                         Term->Text[Term->WritePos+i].Ch = 0;
1173                         }
1174                         VT_int_UpdateScreen(Term, 0);
1175                         break;
1176                 case 1: // Erase to left
1177                         if( Term->Flags & VT_FLAG_ALTBUF )
1178                         {
1179                                  int    i = Term->AltWritePos % Term->Width;
1180                                 while( i -- )
1181                                         Term->AltBuf[Term->AltWritePos++].Ch = 0;
1182                         }
1183                         else
1184                         {
1185                                  int    i = Term->WritePos % Term->Width;
1186                                 while( i -- )
1187                                         Term->Text[Term->WritePos++].Ch = 0;
1188                         }
1189                         VT_int_UpdateScreen(Term, 0);
1190                         break;
1191                 case 2: // Erase all
1192                         if( Term->Flags & VT_FLAG_ALTBUF )
1193                         {
1194                                 VT_int_ClearLine(Term, Term->AltWritePos / Term->Width);
1195                         }
1196                         else
1197                         {
1198                                 VT_int_ClearLine(Term, Term->WritePos / Term->Width);
1199                         }
1200                         VT_int_UpdateScreen(Term, 0);
1201                         break;
1202                 }
1203                 break;
1204
1205         // Set cursor position
1206         case 'H':
1207                 if( Term->Flags & VT_FLAG_ALTBUF )
1208                         Term->AltWritePos = args[0] + args[1]*Term->TextWidth;
1209                 else
1210                         Term->WritePos = args[0] + args[1]*Term->TextWidth;
1211                 //Log_Debug("VTerm", "args = {%i, %i}", args[0], args[1]);
1212                 break;
1213
1214         // Scroll up `n` lines
1215         case 'S':
1216                 tmp = -1;
1217         // Scroll down `n` lines
1218         case 'T':
1219                 if(argc == 1)   tmp *= args[0];
1220                 if( Term->Flags & VT_FLAG_ALTBUF )
1221                         VT_int_ScrollText(Term, tmp);
1222                 else
1223                 {
1224                         if(Term->ViewPos/Term->TextWidth + tmp < 0)
1225                                 break;
1226                         if(Term->ViewPos/Term->TextWidth + tmp  > Term->TextHeight * (giVT_Scrollback + 1))
1227                                 break;
1228
1229                         Term->ViewPos += Term->TextWidth*tmp;
1230                 }
1231                 break;
1232
1233         // Set Font flags
1234         case 'm':
1235                 for( ; argc--; )
1236                 {
1237                          int    colour_idx;
1238                         // Flags
1239                         if( 0 <= args[argc] && args[argc] <= 8)
1240                         {
1241                                 switch(args[argc])
1242                                 {
1243                                 case 0: Term->CurColour = DEFAULT_COLOUR;       break;  // Reset
1244                                 case 1: Term->CurColour |= 0x80000000;  break;  // Bright
1245                                 case 2: Term->CurColour &= ~0x80000000; break;  // Dim
1246                                 }
1247                         }
1248                         // Foreground Colour
1249                         else if(30 <= args[argc] && args[argc] <= 37) {
1250                                 // Get colour index, accounting for bright bit
1251                                 colour_idx = args[argc]-30 + ((Term->CurColour>>28) & 8);
1252                                 Term->CurColour &= 0x8000FFFF;
1253                                 Term->CurColour |= (Uint32)caVT100Colours[ colour_idx ] << 16;
1254                         }
1255                         // Background Colour
1256                         else if(40 <= args[argc] && args[argc] <= 47) {
1257                                 // Get colour index, accounting for bright bit
1258                                 colour_idx = args[argc]-40 + ((Term->CurColour>>12) & 8);
1259                                 Term->CurColour &= 0xFFFF8000;
1260                                 Term->CurColour |= caVT100Colours[ colour_idx ];
1261                         }
1262                         else {
1263                                 Log_Warning("VTerm", "Unknown font flag %i", args[argc]);
1264                         }
1265                 }
1266                 break;
1267
1268         // Set scrolling region
1269         case 'r':
1270                 if( argc != 2 ) break;
1271                 Term->ScrollTop = args[0];
1272                 Term->ScrollHeight = args[1] - args[0];
1273                 break;
1274
1275         default:
1276                 Log_Warning("VTerm", "Unknown control sequence '\\x1B[%c'", CmdChar);
1277                 break;
1278         }
1279 }
1280
1281 /**
1282  * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
1283  * \brief Parses a VT100 Escape code
1284  */
1285 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
1286 {
1287         char    c;
1288          int    argc = 0, j = 1;
1289          int    args[6] = {0,0,0,0};
1290          int    bQuestionMark = 0;
1291
1292         switch(Buffer[0])
1293         {
1294         //Large Code
1295         case '[':
1296                 // Get Arguments
1297                 c = Buffer[j++];
1298                 if(c == '?') {
1299                         bQuestionMark = 1;
1300                         c = Buffer[j++];
1301                 }
1302                 if( '0' <= c && c <= '9' )
1303                 {
1304                         do {
1305                                 if(c == ';')    c = Buffer[j++];
1306                                 while('0' <= c && c <= '9') {
1307                                         args[argc] *= 10;
1308                                         args[argc] += c-'0';
1309                                         c = Buffer[j++];
1310                                 }
1311                                 argc ++;
1312                         } while(c == ';');
1313                 }
1314
1315                 // Get Command
1316                 if( ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
1317                 {
1318                         if( bQuestionMark )
1319                         {
1320                                 switch(c)
1321                                 {
1322                                 // DEC Private Mode Set
1323                                 case 'h':
1324                                         if(argc != 1)   break;
1325                                         switch(args[0])
1326                                         {
1327                                         case 1047:
1328                                                 VT_int_ToggleAltBuffer(Term, 1);
1329                                                 break;
1330                                         }
1331                                         break;
1332                                 case 'l':
1333                                         if(argc != 1)   break;
1334                                         switch(args[0])
1335                                         {
1336                                         case 1047:
1337                                                 VT_int_ToggleAltBuffer(Term, 0);
1338                                                 break;
1339                                         }
1340                                         break;
1341                                 default:
1342                                         Log_Warning("VTerm", "Unknown control sequence '\\x1B[?%c'", c);
1343                                         break;
1344                                 }
1345                         }
1346                         else
1347                         {
1348                                 VT_int_ParseEscape_StandardLarge(Term, c, argc, args);
1349                         }
1350                 }
1351                 break;
1352
1353         default:
1354                 Log_Notice("VTerm", "TODO: Handle short escape codes");
1355                 break;
1356         }
1357
1358         //Log_Debug("VTerm", "j = %i, Buffer = '%s'", j, Buffer);
1359         return j;
1360 }
1361
1362 /**
1363  * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1364  * \brief Print a string to the Virtual Terminal
1365  */
1366 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
1367 {
1368         Uint32  val;
1369          int    i;
1370
1371         // Iterate
1372         for( i = 0; i < Count; i++ )
1373         {
1374                 // Handle escape sequences
1375                 if( Buffer[i] == 0x1B )
1376                 {
1377                         i ++;
1378                         i += VT_int_ParseEscape(Term, (char*)&Buffer[i]) - 1;
1379                         continue;
1380                 }
1381
1382                 // Fast check for non UTF-8
1383                 if( Buffer[i] < 128 )   // Plain ASCII
1384                         VT_int_PutChar(Term, Buffer[i]);
1385                 else {  // UTF-8
1386                         i += ReadUTF8(&Buffer[i], &val) - 1;
1387                         VT_int_PutChar(Term, val);
1388                 }
1389         }
1390         // Update Screen
1391         VT_int_UpdateScreen( Term, 0 );
1392 }
1393
1394 /**
1395  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1396  * \brief Write a single character to a VTerm
1397  */
1398 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
1399 {
1400          int    i;
1401         tVT_Char        *buffer;
1402          int    write_pos;
1403
1404         if(Term->Flags & VT_FLAG_ALTBUF) {
1405                 buffer = Term->AltBuf;
1406                 write_pos = Term->AltWritePos;
1407         }
1408         else {
1409                 buffer = Term->Text;
1410                 write_pos = Term->WritePos;
1411         }
1412
1413         switch(Ch)
1414         {
1415         case '\0':      return; // Ignore NULL byte
1416         case '\n':
1417                 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
1418                 write_pos += Term->TextWidth;
1419         case '\r':
1420                 write_pos -= write_pos % Term->TextWidth;
1421                 break;
1422
1423         case '\t': { int tmp = write_pos / Term->TextWidth;
1424                 write_pos %= Term->TextWidth;
1425                 do {
1426                         buffer[ write_pos ].Ch = '\0';
1427                         buffer[ write_pos ].Colour = Term->CurColour;
1428                         write_pos ++;
1429                 } while(write_pos & 7);
1430                 write_pos += tmp * Term->TextWidth;
1431                 break; }
1432
1433         case '\b':
1434                 // Backspace is invalid at Offset 0
1435                 if(write_pos == 0)      break;
1436
1437                 write_pos --;
1438                 // Singe Character
1439                 if(buffer[ write_pos ].Ch != '\0') {
1440                         buffer[ write_pos ].Ch = 0;
1441                         buffer[ write_pos ].Colour = Term->CurColour;
1442                         break;
1443                 }
1444                 // Tab
1445                 i = 7;  // Limit it to 8
1446                 do {
1447                         buffer[ write_pos ].Ch = 0;
1448                         buffer[ write_pos ].Colour = Term->CurColour;
1449                         write_pos --;
1450                 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
1451                 if(buffer[ write_pos ].Ch != '\0')
1452                         write_pos ++;
1453                 break;
1454
1455         default:
1456                 buffer[ write_pos ].Ch = Ch;
1457                 buffer[ write_pos ].Colour = Term->CurColour;
1458                 // Update the line before wrapping
1459                 if( (write_pos + 1) % Term->TextWidth == 0 )
1460                         VT_int_UpdateScreen( Term, 0 );
1461                 write_pos ++;
1462                 break;
1463         }
1464
1465         if(Term->Flags & VT_FLAG_ALTBUF)
1466         {
1467                 Term->AltBuf = buffer;
1468                 Term->AltWritePos = write_pos;
1469
1470                 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
1471                 {
1472                         Term->AltWritePos -= Term->TextWidth;
1473                         VT_int_ScrollText(Term, 1);
1474                 }
1475
1476         }
1477         else
1478         {
1479                 Term->Text = buffer;
1480                 Term->WritePos = write_pos;
1481                 // Move Screen
1482                 // - Check if we need to scroll the entire scrollback buffer
1483                 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
1484                 {
1485                          int    base;
1486
1487                         // Update previous line
1488                         Term->WritePos -= Term->TextWidth;
1489                         VT_int_UpdateScreen( Term, 0 );
1490
1491                         // Update view position
1492                         base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
1493                         if(Term->ViewPos < base)
1494                                 Term->ViewPos += Term->Width;
1495                         if(Term->ViewPos > base)
1496                                 Term->ViewPos = base;
1497
1498                         VT_int_ScrollText(Term, 1);
1499                 }
1500                 // Ok, so we only need to scroll the screen
1501                 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
1502                 {
1503                         // Update the last line
1504                         Term->WritePos -= Term->TextWidth;
1505                         VT_int_UpdateScreen( Term, 0 );
1506                         Term->WritePos += Term->TextWidth;
1507
1508                         VT_int_ScrollText(Term, 1);
1509
1510                         Term->ViewPos += Term->TextWidth;
1511                 }
1512         }
1513
1514         //LEAVE('-');
1515 }
1516
1517 void VT_int_ScrollText(tVTerm *Term, int Count)
1518 {
1519         tVT_Char        *buf;
1520          int    height, init_write_pos;
1521          int    len, i;
1522          int    scroll_top, scroll_height;
1523
1524         // Get buffer pointer and attributes
1525         if( Term->Flags & VT_FLAG_ALTBUF )
1526         {
1527                 buf = Term->AltBuf;
1528                 height = Term->TextHeight;
1529                 init_write_pos = Term->AltWritePos;
1530                 scroll_top = Term->ScrollTop;
1531                 scroll_height = Term->ScrollHeight;
1532         }
1533         else
1534         {
1535                 buf = Term->Text;
1536                 height = Term->TextHeight*(giVT_Scrollback+1);
1537                 init_write_pos = Term->WritePos;
1538                 scroll_top = 0;
1539                 scroll_height = height;
1540         }
1541
1542         // Scroll text downwards
1543         if( Count > 0 )
1544         {
1545                  int    base;
1546
1547                 // Set up
1548                 if(Count > scroll_height)       Count = scroll_height;
1549                 base = Term->TextWidth*(scroll_top + scroll_height - Count);
1550                 len = Term->TextWidth*(scroll_height - Count);
1551
1552                 // Scroll terminal cache
1553                 memmove(
1554                         &buf[Term->TextWidth*scroll_top],
1555                         &buf[Term->TextWidth*(scroll_top+Count)],
1556                         len*sizeof(tVT_Char)
1557                         );
1558                 // Clear last rows
1559                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1560                 {
1561                         buf[ base + i ].Ch = 0;
1562                         buf[ base + i ].Colour = Term->CurColour;
1563                 }
1564
1565                 // Update Screen
1566                 VT_int_ScrollFramebuffer( Term, Count );
1567                 if( Term->Flags & VT_FLAG_ALTBUF )
1568                         Term->AltWritePos = base;
1569                 else
1570                         Term->WritePos = Term->ViewPos + Term->TextWidth*(Term->TextHeight - Count);
1571                 for( i = 0; i < Count; i ++ )
1572                 {
1573                         VT_int_UpdateScreen( Term, 0 );
1574                         if( Term->Flags & VT_FLAG_ALTBUF )
1575                                 Term->AltWritePos += Term->TextWidth;
1576                         else
1577                                 Term->WritePos += Term->TextWidth;
1578                 }
1579         }
1580         else
1581         {
1582                 Count = -Count;
1583                 if(Count > scroll_height)       Count = scroll_height;
1584
1585                 len = Term->TextWidth*(scroll_height - Count);
1586
1587                 // Scroll terminal cache
1588                 memmove(
1589                         &buf[Term->TextWidth*(scroll_top+Count)],
1590                         &buf[Term->TextWidth*scroll_top],
1591                         len*sizeof(tVT_Char)
1592                         );
1593                 // Clear preceding rows
1594                 for( i = 0; i < Term->TextWidth*Count; i ++ )
1595                 {
1596                         buf[ i ].Ch = 0;
1597                         buf[ i ].Colour = Term->CurColour;
1598                 }
1599
1600                 VT_int_ScrollFramebuffer( Term, -Count );
1601                 if( Term->Flags & VT_FLAG_ALTBUF )
1602                         Term->AltWritePos = Term->TextWidth*scroll_top;
1603                 else
1604                         Term->WritePos = Term->ViewPos;
1605                 for( i = 0; i < Count; i ++ )
1606                 {
1607                         VT_int_UpdateScreen( Term, 0 );
1608                         if( Term->Flags & VT_FLAG_ALTBUF )
1609                                 Term->AltWritePos += Term->TextWidth;
1610                         else
1611                                 Term->WritePos += Term->TextWidth;
1612                 }
1613         }
1614
1615         if( Term->Flags & VT_FLAG_ALTBUF )
1616                 Term->AltWritePos = init_write_pos;
1617         else
1618                 Term->WritePos = init_write_pos;
1619 }
1620
1621 /**
1622  * \fn void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1623  * \note Scrolls the framebuffer down by \a Count text lines
1624  */
1625 void VT_int_ScrollFramebuffer( tVTerm *Term, int Count )
1626 {
1627          int    tmp;
1628         struct {
1629                 Uint8   Op;
1630                 Uint16  DstX, DstY;
1631                 Uint16  SrcX, SrcY;
1632                 Uint16  W, H;
1633         } PACKED        buf;
1634
1635         // Only update if this is the current terminal
1636         if( Term != gpVT_CurTerm )      return;
1637
1638         if( Count > Term->ScrollHeight )        Count = Term->ScrollHeight;
1639         if( Count < -Term->ScrollHeight )       Count = -Term->ScrollHeight;
1640
1641         // Switch to 2D Command Stream
1642         tmp = VIDEO_BUFFMT_2DSTREAM;
1643         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1644
1645         // BLIT to 0,0 from 0,giVT_CharHeight
1646         buf.Op = VIDEO_2DOP_BLIT;
1647         buf.SrcX = 0;   buf.DstX = 0;
1648         // TODO: Don't assume character dimensions
1649         buf.W = Term->TextWidth * giVT_CharWidth;
1650         if( Count > 0 )
1651         {
1652                 buf.SrcY = (Term->ScrollTop+Count) * giVT_CharHeight;
1653                 buf.DstY = Term->ScrollTop * giVT_CharHeight;
1654         }
1655         else    // Scroll up, move text down
1656         {
1657                 Count = -Count;
1658                 buf.SrcY = Term->ScrollTop * giVT_CharHeight;
1659                 buf.DstY = (Term->ScrollTop+Count) * giVT_CharHeight;
1660         }
1661         buf.H = (Term->ScrollHeight-Count) * giVT_CharHeight;
1662         VFS_WriteAt(giVT_OutputDevHandle, 0, sizeof(buf), &buf);
1663
1664         // Restore old mode (this function is only called during text mode)
1665         tmp = VIDEO_BUFFMT_TEXT;
1666         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETBUFFORMAT, &tmp);
1667 }
1668
1669 void VT_int_UpdateCursor( tVTerm *Term, int bShow )
1670 {
1671         tVideo_IOCtl_Pos        csr_pos;
1672
1673         if( Term != gpVT_CurTerm )      return ;
1674
1675         if( !bShow )
1676         {
1677                 csr_pos.x = -1;
1678                 csr_pos.y = -1;
1679         }
1680         else if( Term->Mode == TERM_MODE_TEXT )
1681         {
1682                  int    offset;
1683
1684 //              if( !(Term->Flags & VT_FLAG_SHOWCSR)
1685 //               && ( (Term->Flags & VT_FLAG_HIDECSR) || !Term->Node.ReadThreads)
1686 //                )
1687                 if( !Term->Text || Term->Flags & VT_FLAG_HIDECSR )
1688                 {
1689                         csr_pos.x = -1;
1690                         csr_pos.y = -1;
1691                 }
1692                 else
1693                 {
1694                         if(Term->Flags & VT_FLAG_ALTBUF)
1695                                 offset = Term->AltWritePos;
1696                         else
1697                                 offset = Term->WritePos - Term->ViewPos;
1698
1699                         csr_pos.x = offset % Term->TextWidth;
1700                         csr_pos.y = offset / Term->TextWidth;
1701                         if( 0 > csr_pos.y || csr_pos.y >= Term->TextHeight )
1702                                 csr_pos.y = -1, csr_pos.x = -1;
1703                 }
1704         }
1705         else
1706         {
1707                 csr_pos.x = Term->VideoCursorX;
1708                 csr_pos.y = Term->VideoCursorY;
1709         }
1710         VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &csr_pos);
1711 }
1712
1713 /**
1714  * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1715  * \brief Updates the video framebuffer
1716  */
1717 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
1718 {
1719         tVT_Char        *buffer;
1720          int    view_pos, write_pos;
1721         // Only update if this is the current terminal
1722         if( Term != gpVT_CurTerm )      return;
1723
1724         switch( Term->Mode )
1725         {
1726         case TERM_MODE_TEXT:
1727                 view_pos = (Term->Flags & VT_FLAG_ALTBUF) ? 0 : Term->ViewPos;
1728                 write_pos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
1729                 buffer = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
1730                 // Re copy the entire screen?
1731                 if(UpdateAll) {
1732                         VFS_WriteAt(
1733                                 giVT_OutputDevHandle,
1734                                 0,
1735                                 Term->TextWidth*Term->TextHeight*sizeof(tVT_Char),
1736                                 &buffer[view_pos]
1737                                 );
1738                 }
1739                 // Only copy the current line
1740                 else {
1741                          int    ofs = write_pos - write_pos % Term->TextWidth;
1742                         VFS_WriteAt(
1743                                 giVT_OutputDevHandle,
1744                                 (ofs - view_pos)*sizeof(tVT_Char),
1745                                 Term->TextWidth*sizeof(tVT_Char),
1746                                 &buffer[ofs]
1747                                 );
1748                 }
1749                 break;
1750         case TERM_MODE_FB:
1751                 break;
1752         }
1753
1754         VT_int_UpdateCursor(Term, 1);
1755 }
1756
1757 /**
1758  * \brief Update the screen mode
1759  * \param Term  Terminal to update
1760  * \param NewMode       New mode to set
1761  * \param NewWidth      New framebuffer width
1762  * \param NewHeight     New framebuffer height
1763  */
1764 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
1765 {
1766          int    oldW = Term->Width;
1767          int    oldTW = Term->TextWidth;
1768          int    oldH = Term->Height;
1769          int    oldTH = Term->TextHeight;
1770         tVT_Char        *oldTBuf = Term->Text;
1771         Uint32  *oldFB = Term->Buffer;
1772          int    w, h, i;
1773
1774         // TODO: Increase RealWidth/RealHeight when this happens
1775         if(NewWidth > giVT_RealWidth)   NewWidth = giVT_RealWidth;
1776         if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
1777
1778         Term->Mode = NewMode;
1779
1780         // Fast exit if no resolution change
1781         if(NewWidth == Term->Width && NewHeight == Term->Height)
1782                 return ;
1783
1784         // Calculate new dimensions
1785         Term->Width = NewWidth;
1786         Term->Height = NewHeight;
1787         Term->TextWidth = NewWidth / giVT_CharWidth;
1788         Term->TextHeight = NewHeight / giVT_CharHeight;
1789         Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
1790
1791         // Allocate new buffers
1792         // - Text
1793         Term->Text = calloc(
1794                 Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
1795                 sizeof(tVT_Char)
1796                 );
1797         if(oldTBuf) {
1798                 // Copy old buffer
1799                 w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
1800                 h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
1801                 h *= giVT_Scrollback + 1;
1802                 for( i = 0; i < h; i ++ )
1803                 {
1804                         memcpy(
1805                                 &Term->Text[i*Term->TextWidth],
1806                                 &oldTBuf[i*oldTW],
1807                                 w*sizeof(tVT_Char)
1808                                 );
1809                 }
1810                 free(oldTBuf);
1811         }
1812
1813         // - Alternate Text
1814         Term->AltBuf = realloc(
1815                 Term->AltBuf,
1816                 Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
1817                 );
1818
1819         // - Framebuffer
1820         if(oldFB) {
1821                 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
1822                 // Copy old buffer
1823                 w = (oldW > Term->Width) ? Term->Width : oldW;
1824                 h = (oldH > Term->Height) ? Term->Height : oldH;
1825                 for( i = 0; i < h; i ++ )
1826                 {
1827                         memcpy(
1828                                 &Term->Buffer[i*Term->Width],
1829                                 &oldFB[i*oldW],
1830                                 w*sizeof(Uint32)
1831                                 );
1832                 }
1833                 free(oldFB);
1834         }
1835
1836         // Debug
1837         switch(NewMode)
1838         {
1839         case TERM_MODE_TEXT:
1840                 Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
1841                         Term, Term->TextWidth, Term->TextHeight);
1842                 break;
1843         case TERM_MODE_FB:
1844                 Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
1845                         Term, Term->Width, Term->Height);
1846                 break;
1847         //case TERM_MODE_2DACCEL:
1848         //case TERM_MODE_3DACCEL:
1849         //      return;
1850         }
1851 }
1852
1853
1854 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
1855 {
1856         if(Enabled)
1857                 Term->Flags |= VT_FLAG_ALTBUF;
1858         else
1859                 Term->Flags &= ~VT_FLAG_ALTBUF;
1860         VT_int_UpdateScreen(Term, 1);
1861 }
1862
1863 // ---
1864 // Font Render
1865 // ---
1866 #define MONOSPACE_FONT  10816
1867
1868 #if MONOSPACE_FONT == 10808     // 8x8
1869 # include "vterm_font_8x8.h"
1870 #elif MONOSPACE_FONT == 10816   // 8x16
1871 # include "vterm_font_8x16.h"
1872 #endif
1873
1874 // === PROTOTYPES ===
1875 Uint8   *VT_Font_GetChar(Uint32 Codepoint);
1876
1877 // === GLOBALS ===
1878 int     giVT_CharWidth = FONT_WIDTH;
1879 int     giVT_CharHeight = FONT_HEIGHT;
1880
1881 // === CODE ===
1882 /**
1883  * \brief Render a font character
1884  */
1885 void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC)
1886 {
1887         Uint8   *font;
1888          int    x, y;
1889
1890         // 8-bpp and below
1891         if( Depth <= 8 )
1892         {
1893                 Uint8   *buf = Buffer;
1894
1895                 font = VT_Font_GetChar(Codepoint);
1896
1897                 for(y = 0; y < FONT_HEIGHT; y ++)
1898                 {
1899                         for(x = 0; x < FONT_WIDTH; x ++)
1900                         {
1901                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1902                                         buf[x] = FGC;
1903                                 else
1904                                         buf[x] = BGC;
1905                         }
1906                         buf = (void*)( (tVAddr)buf + Pitch );
1907                         font ++;
1908                 }
1909         }
1910         // 16-bpp and below
1911         else if( Depth <= 16 )
1912         {
1913                 Uint16  *buf = Buffer;
1914
1915                 font = VT_Font_GetChar(Codepoint);
1916
1917                 for(y = 0; y < FONT_HEIGHT; y ++)
1918                 {
1919                         for(x = 0; x < FONT_WIDTH; x ++)
1920                         {
1921                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1922                                         buf[x] = FGC;
1923                                 else
1924                                         buf[x] = BGC;
1925                         }
1926                         buf = (void*)( (tVAddr)buf + Pitch );
1927                         font ++;
1928                 }
1929         }
1930         // 24-bpp colour
1931         // - Special handling to not overwrite the next pixel
1932         //TODO: Endian issues here
1933         else if( Depth == 24 )
1934         {
1935                 Uint8   *buf = Buffer;
1936                 Uint8   bg_r = (BGC >> 16) & 0xFF;
1937                 Uint8   bg_g = (BGC >>  8) & 0xFF;
1938                 Uint8   bg_b = (BGC >>  0) & 0xFF;
1939                 Uint8   fg_r = (FGC >> 16) & 0xFF;
1940                 Uint8   fg_g = (FGC >>  8) & 0xFF;
1941                 Uint8   fg_b = (FGC >>  0) & 0xFF;
1942
1943                 font = VT_Font_GetChar(Codepoint);
1944
1945                 for(y = 0; y < FONT_HEIGHT; y ++)
1946                 {
1947                         for(x = 0; x < FONT_WIDTH; x ++)
1948                         {
1949                                 Uint8   r, g, b;
1950
1951                                 if(*font & (1 << (FONT_WIDTH-x-1))) {
1952                                         r = fg_r;       g = fg_g;       b = fg_b;
1953                                 }
1954                                 else {
1955                                         r = bg_r;       g = bg_g;       b = bg_b;
1956                                 }
1957                                 buf[x*3+0] = b;
1958                                 buf[x*3+1] = g;
1959                                 buf[x*3+2] = r;
1960                         }
1961                         buf = (void*)( (tVAddr)buf + Pitch );
1962                         font ++;
1963                 }
1964         }
1965         // 32-bpp colour (nice and easy)
1966         else if( Depth == 32 )
1967         {
1968                 Uint32  *buf = Buffer;
1969
1970                 font = VT_Font_GetChar(Codepoint);
1971
1972                 for(y = 0; y < FONT_HEIGHT; y ++)
1973                 {
1974                         for(x = 0; x < FONT_WIDTH; x ++)
1975                         {
1976                                 if(*font & (1 << (FONT_WIDTH-x-1)))
1977                                         buf[x] = FGC;
1978                                 else
1979                                         buf[x] = BGC;
1980                         }
1981                         buf = (Uint32*)( (tVAddr)buf + Pitch );
1982                         font ++;
1983                 }
1984         }
1985 }
1986
1987 /**
1988  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
1989  * \brief Converts a 12-bit colour into 24 bits
1990  */
1991 Uint32 VT_Colour12to24(Uint16 Col12)
1992 {
1993         Uint32  ret;
1994          int    tmp;
1995         tmp = Col12 & 0xF;
1996         ret  = (tmp << 0) | (tmp << 4);
1997         tmp = (Col12 & 0xF0) >> 4;
1998         ret |= (tmp << 8) | (tmp << 12);
1999         tmp = (Col12 & 0xF00) >> 8;
2000         ret |= (tmp << 16) | (tmp << 20);
2001         return ret;
2002 }
2003 /**
2004  * \brief Converts a 12-bit colour into 15 bits
2005  */
2006 Uint16 VT_Colour12to15(Uint16 Col12)
2007 {
2008         Uint32  ret;
2009          int    tmp;
2010         tmp = Col12 & 0xF;
2011         ret  = (tmp << 1) | (tmp & 1);
2012         tmp = (Col12 & 0xF0) >> 4;
2013         ret |= ( (tmp << 1) | (tmp & 1) ) << 5;
2014         tmp = (Col12 & 0xF00) >> 8;
2015         ret |= ( (tmp << 1) | (tmp & 1) ) << 10;
2016         return ret;
2017 }
2018
2019 /**
2020  * \brief Converts a 12-bit colour into any other depth
2021  * \param Col12 12-bit source colour
2022  * \param Depth Desired bit deptj
2023  * \note Green then blue get the extra avaliable bits (16:5-6-5, 14:4-5-5)
2024  */
2025 Uint32 VT_Colour12toN(Uint16 Col12, int Depth)
2026 {
2027         Uint32  ret;
2028         Uint32  r, g, b;
2029          int    rSize, gSize, bSize;
2030
2031         // Fast returns
2032         if( Depth == 24 )       return VT_Colour12to24(Col12);
2033         if( Depth == 15 )       return VT_Colour12to15(Col12);
2034         // - 32 is a special case, it's usually 24-bit colour with an unused byte
2035         if( Depth == 32 )       return VT_Colour12to24(Col12);
2036
2037         // Bounds checks
2038         if( Depth < 8 ) return 0;
2039         if( Depth > 32 )        return 0;
2040
2041         r = Col12 & 0xF;
2042         g = (Col12 & 0xF0) >> 4;
2043         b = (Col12 & 0xF00) >> 8;
2044
2045         rSize = gSize = bSize = Depth / 3;
2046         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 1
2047                 gSize ++;
2048         if( rSize + gSize + bSize < Depth )     // Depth % 3 == 2
2049                 bSize ++;
2050
2051         // Expand
2052         r <<= rSize - 4;        g <<= gSize - 4;        b <<= bSize - 4;
2053         // Fill with the lowest bit
2054         if( Col12 & 0x001 )     r |= (1 << (rSize - 4)) - 1;
2055         if( Col12 & 0x010 )     r |= (1 << (gSize - 4)) - 1;
2056         if( Col12 & 0x100 )     r |= (1 << (bSize - 4)) - 1;
2057
2058         // Create output
2059         ret  = r;
2060         ret |= g << rSize;
2061         ret |= b << (rSize + gSize);
2062
2063         return ret;
2064 }
2065
2066 /**
2067  * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
2068  * \brief Gets an index into the font array given a Unicode Codepoint
2069  * \note See http://en.wikipedia.org/wiki/CP437
2070  */
2071 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
2072 {
2073          int    index = 0;
2074         if(Codepoint < 128)
2075                 return &VTermFont[Codepoint*FONT_HEIGHT];
2076         switch(Codepoint)
2077         {
2078         case 0xC7:      index = 128;    break;  // Ç
2079         case 0xFC:      index = 129;    break;  // ü
2080         case 0xE9:      index = 130;    break;  // é
2081         case 0xE2:      index = 131;    break;  // â
2082         case 0xE4:      index = 132;    break;  // ä
2083         case 0xE0:      index = 133;    break;  // à
2084         case 0xE5:      index = 134;    break;  // å
2085         case 0xE7:      index = 135;    break;  // ç
2086         case 0xEA:      index = 136;    break;  // ê
2087         case 0xEB:      index = 137;    break;  // ë
2088         case 0xE8:      index = 138;    break;  // è
2089         case 0xEF:      index = 139;    break;  // ï
2090         case 0xEE:      index = 140;    break;  // î
2091         case 0xEC:      index = 141;    break;  // ì
2092         case 0xC4:      index = 142;    break;  // Ä
2093         case 0xC5:      index = 143;    break;  // Å
2094         }
2095
2096         return &VTermFont[index*FONT_HEIGHT];
2097 }
2098
2099 EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
2100 EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
2101 EXPORT(VT_Font_Render);
2102 EXPORT(VT_Colour12to24);