KernelLand/Kernel/drv/vterm_termbuf.c

   1 /*
   2  * Acess2 Kernel
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * drv/vterm_termbuf.c
   6  * - Virtual Terminal - Terminal buffer manipulation
   7  */
   8 #include "vterm.h"
   9
  10 // === CODE ===
  11
  12 /**
  13  * \fn void VT_int_PutString(tVTerm *Term, const Uint8 *Buffer, Uint Count)
  14  * \brief Print a string to the Virtual Terminal
  15  */
  16 void VT_int_PutString(tVTerm *Term, const Uint8 *Buffer, Uint Count)
  17 {
  18         Uint32  val;
  19          int    i;
  20
  21         // Iterate
  22         for( i = 0; i < Count; i++ )
  23         {
  24                 // Handle escape sequences
  25                 if( Buffer[i] == 0x1B )
  26                 {
  27                         i ++;
  28                         i += VT_int_ParseEscape(Term, (const char*)&Buffer[i]) - 1;
  29                         continue;
  30                 }
  31
  32                 // Fast check for non UTF-8
  33                 if( Buffer[i] < 128 )   // Plain ASCII
  34                         VT_int_PutChar(Term, Buffer[i]);
  35                 else {  // UTF-8
  36                         i += ReadUTF8(&Buffer[i], &val) - 1;
  37                         VT_int_PutChar(Term, val);
  38                 }
  39         }
  40         // Update Screen
  41         VT_int_UpdateScreen( Term, 0 );
  42 }
  43
  44 /**
  45  * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
  46  * \brief Write a single character to a VTerm
  47  */
  48 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
  49 {
  50          int    i;
  51         tVT_Char        *buffer;
  52          int    write_pos;
  53
  54         if(Term->Flags & VT_FLAG_ALTBUF) {
  55                 buffer = Term->AltBuf;
  56                 write_pos = Term->AltWritePos;
  57         }
  58         else {
  59                 buffer = Term->Text;
  60                 write_pos = Term->WritePos;
  61         }
  62
  63         switch(Ch)
  64         {
  65         case '\0':      return; // Ignore NULL byte
  66         case '\n':
  67                 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
  68                 write_pos += Term->TextWidth;
  69         case '\r':
  70                 write_pos -= write_pos % Term->TextWidth;
  71                 break;
  72
  73         case '\t': { int tmp = write_pos / Term->TextWidth;
  74                 write_pos %= Term->TextWidth;
  75                 do {
  76                         buffer[ write_pos ].Ch = '\0';
  77                         buffer[ write_pos ].Colour = Term->CurColour;
  78                         write_pos ++;
  79                 } while(write_pos & 7);
  80                 write_pos += tmp * Term->TextWidth;
  81                 break; }
  82
  83         case '\b':
  84                 // Backspace is invalid at Offset 0
  85                 if(write_pos == 0)      break;
  86
  87                 write_pos --;
  88                 // Singe Character
  89                 if(buffer[ write_pos ].Ch != '\0') {
  90                         buffer[ write_pos ].Ch = 0;
  91                         buffer[ write_pos ].Colour = Term->CurColour;
  92                         break;
  93                 }
  94                 // Tab
  95                 i = 7;  // Limit it to 8
  96                 do {
  97                         buffer[ write_pos ].Ch = 0;
  98                         buffer[ write_pos ].Colour = Term->CurColour;
  99                         write_pos --;
 100                 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
 101                 if(buffer[ write_pos ].Ch != '\0')
 102                         write_pos ++;
 103                 break;
 104
 105         default:
 106                 buffer[ write_pos ].Ch = Ch;
 107                 buffer[ write_pos ].Colour = Term->CurColour;
 108                 // Update the line before wrapping
 109                 if( (write_pos + 1) % Term->TextWidth == 0 )
 110                         VT_int_UpdateScreen( Term, 0 );
 111                 write_pos ++;
 112                 break;
 113         }
 114
 115         if(Term->Flags & VT_FLAG_ALTBUF)
 116         {
 117                 Term->AltBuf = buffer;
 118                 Term->AltWritePos = write_pos;
 119
 120                 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
 121                 {
 122                         Term->AltWritePos -= Term->TextWidth;
 123                         VT_int_ScrollText(Term, 1);
 124                 }
 125
 126         }
 127         else
 128         {
 129                 Term->Text = buffer;
 130                 Term->WritePos = write_pos;
 131                 // Move Screen
 132                 // - Check if we need to scroll the entire scrollback buffer
 133                 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
 134                 {
 135                          int    base;
 136
 137                         // Update previous line
 138                         Term->WritePos -= Term->TextWidth;
 139                         VT_int_UpdateScreen( Term, 0 );
 140
 141                         // Update view position
 142                         base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
 143                         if(Term->ViewPos < base)
 144                                 Term->ViewPos += Term->Width;
 145                         if(Term->ViewPos > base)
 146                                 Term->ViewPos = base;
 147
 148                         VT_int_ScrollText(Term, 1);
 149                 }
 150                 // Ok, so we only need to scroll the screen
 151                 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
 152                 {
 153                         // Update the last line
 154                         Term->WritePos -= Term->TextWidth;
 155                         VT_int_UpdateScreen( Term, 0 );
 156                         Term->WritePos += Term->TextWidth;
 157
 158                         VT_int_ScrollText(Term, 1);
 159
 160                         Term->ViewPos += Term->TextWidth;
 161                 }
 162         }
 163
 164         //LEAVE('-');
 165 }
 166
 167 void VT_int_ScrollText(tVTerm *Term, int Count)
 168 {
 169         tVT_Char        *buf;
 170          int    height, init_write_pos;
 171          int    len, i;
 172          int    scroll_top, scroll_height;
 173
 174         // Get buffer pointer and attributes
 175         if( Term->Flags & VT_FLAG_ALTBUF )
 176         {
 177                 buf = Term->AltBuf;
 178                 height = Term->TextHeight;
 179                 init_write_pos = Term->AltWritePos;
 180                 scroll_top = Term->ScrollTop;
 181                 scroll_height = Term->ScrollHeight;
 182         }
 183         else
 184         {
 185                 buf = Term->Text;
 186                 height = Term->TextHeight*(giVT_Scrollback+1);
 187                 init_write_pos = Term->WritePos;
 188                 scroll_top = 0;
 189                 scroll_height = height;
 190         }
 191
 192         // Scroll text downwards
 193         if( Count > 0 )
 194         {
 195                  int    base;
 196
 197                 // Set up
 198                 if(Count > scroll_height)       Count = scroll_height;
 199                 base = Term->TextWidth*(scroll_top + scroll_height - Count);
 200                 len = Term->TextWidth*(scroll_height - Count);
 201
 202                 // Scroll terminal cache
 203                 memmove(
 204                         &buf[Term->TextWidth*scroll_top],
 205                         &buf[Term->TextWidth*(scroll_top+Count)],
 206                         len*sizeof(tVT_Char)
 207                         );
 208                 // Clear last rows
 209                 for( i = 0; i < Term->TextWidth*Count; i ++ )
 210                 {
 211                         buf[ base + i ].Ch = 0;
 212                         buf[ base + i ].Colour = Term->CurColour;
 213                 }
 214
 215                 // Update Screen
 216                 VT_int_ScrollFramebuffer( Term, Count );
 217                 if( Term->Flags & VT_FLAG_ALTBUF )
 218                         Term->AltWritePos = base;
 219                 else
 220                         Term->WritePos = Term->ViewPos + Term->TextWidth*(Term->TextHeight - Count);
 221                 for( i = 0; i < Count; i ++ )
 222                 {
 223                         VT_int_UpdateScreen( Term, 0 );
 224                         if( Term->Flags & VT_FLAG_ALTBUF )
 225                                 Term->AltWritePos += Term->TextWidth;
 226                         else
 227                                 Term->WritePos += Term->TextWidth;
 228                 }
 229         }
 230         else
 231         {
 232                 Count = -Count;
 233                 if(Count > scroll_height)       Count = scroll_height;
 234
 235                 len = Term->TextWidth*(scroll_height - Count);
 236
 237                 // Scroll terminal cache
 238                 memmove(
 239                         &buf[Term->TextWidth*(scroll_top+Count)],
 240                         &buf[Term->TextWidth*scroll_top],
 241                         len*sizeof(tVT_Char)
 242                         );
 243                 // Clear preceding rows
 244                 for( i = 0; i < Term->TextWidth*Count; i ++ )
 245                 {
 246                         buf[ i ].Ch = 0;
 247                         buf[ i ].Colour = Term->CurColour;
 248                 }
 249
 250                 VT_int_ScrollFramebuffer( Term, -Count );
 251                 if( Term->Flags & VT_FLAG_ALTBUF )
 252                         Term->AltWritePos = Term->TextWidth*scroll_top;
 253                 else
 254                         Term->WritePos = Term->ViewPos;
 255                 for( i = 0; i < Count; i ++ )
 256                 {
 257                         VT_int_UpdateScreen( Term, 0 );
 258                         if( Term->Flags & VT_FLAG_ALTBUF )
 259                                 Term->AltWritePos += Term->TextWidth;
 260                         else
 261                                 Term->WritePos += Term->TextWidth;
 262                 }
 263         }
 264
 265         if( Term->Flags & VT_FLAG_ALTBUF )
 266                 Term->AltWritePos = init_write_pos;
 267         else
 268                 Term->WritePos = init_write_pos;
 269 }
 270
 271 /**
 272  * \brief Clears a line in a virtual terminal
 273  * \param Term  Terminal to modify
 274  * \param Num   Line number to clear
 275  */
 276 void VT_int_ClearLine(tVTerm *Term, int Num)
 277 {
 278          int    i;
 279         tVT_Char        *cell;
 280
 281         if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )        return ;
 282
 283         cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
 284         cell = &cell[ Num*Term->TextWidth ];
 285
 286         for( i = Term->TextWidth; i--; )
 287         {
 288                 cell[ i ].Ch = 0;
 289                 cell[ i ].Colour = Term->CurColour;
 290         }
 291 }
 292
 293 /**
 294  * \brief Update the screen mode
 295  * \param Term  Terminal to update
 296  * \param NewMode       New mode to set
 297  * \param NewWidth      New framebuffer width
 298  * \param NewHeight     New framebuffer height
 299  */
 300 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
 301 {
 302          int    oldW = Term->Width;
 303          int    oldTW = Term->TextWidth;
 304          int    oldH = Term->Height;
 305          int    oldTH = Term->TextHeight;
 306         tVT_Char        *oldTBuf = Term->Text;
 307         Uint32  *oldFB = Term->Buffer;
 308          int    w, h, i;
 309
 310         // TODO: Increase RealWidth/RealHeight when this happens
 311         if(NewWidth > giVT_RealWidth)   NewWidth = giVT_RealWidth;
 312         if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
 313
 314         Term->Mode = NewMode;
 315
 316         // Fast exit if no resolution change
 317         if(NewWidth == Term->Width && NewHeight == Term->Height)
 318                 return ;
 319
 320         // Calculate new dimensions
 321         Term->Width = NewWidth;
 322         Term->Height = NewHeight;
 323         Term->TextWidth = NewWidth / giVT_CharWidth;
 324         Term->TextHeight = NewHeight / giVT_CharHeight;
 325         Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
 326
 327         // Allocate new buffers
 328         // - Text
 329         Term->Text = calloc(
 330                 Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
 331                 sizeof(tVT_Char)
 332                 );
 333         if(oldTBuf) {
 334                 // Copy old buffer
 335                 w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
 336                 h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
 337                 h *= giVT_Scrollback + 1;
 338                 for( i = 0; i < h; i ++ )
 339                 {
 340                         memcpy(
 341                                 &Term->Text[i*Term->TextWidth],
 342                                 &oldTBuf[i*oldTW],
 343                                 w*sizeof(tVT_Char)
 344                                 );
 345                 }
 346                 free(oldTBuf);
 347         }
 348
 349         // - Alternate Text
 350         Term->AltBuf = realloc(
 351                 Term->AltBuf,
 352                 Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
 353                 );
 354
 355         // - Framebuffer
 356         if(oldFB) {
 357                 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
 358                 // Copy old buffer
 359                 w = (oldW > Term->Width) ? Term->Width : oldW;
 360                 h = (oldH > Term->Height) ? Term->Height : oldH;
 361                 for( i = 0; i < h; i ++ )
 362                 {
 363                         memcpy(
 364                                 &Term->Buffer[i*Term->Width],
 365                                 &oldFB[i*oldW],
 366                                 w*sizeof(Uint32)
 367                                 );
 368                 }
 369                 free(oldFB);
 370         }
 371
 372         // Debug
 373         switch(NewMode)
 374         {
 375         case TERM_MODE_TEXT:
 376                 Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
 377                         Term, Term->TextWidth, Term->TextHeight);
 378                 break;
 379         case TERM_MODE_FB:
 380                 Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
 381                         Term, Term->Width, Term->Height);
 382                 break;
 383         //case TERM_MODE_2DACCEL:
 384         //case TERM_MODE_3DACCEL:
 385         //      return;
 386         }
 387 }
 388
 389
 390 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
 391 {
 392         if(Enabled)
 393                 Term->Flags |= VT_FLAG_ALTBUF;
 394         else
 395                 Term->Flags &= ~VT_FLAG_ALTBUF;
 396         VT_int_UpdateScreen(Term, 1);
 397 }
 398