code.delx.au - refind/blob - refind/screen.c

   1 /*
   2  * refind/screen.c
   3  * Screen handling functions
   4  *
   5  * Copyright (c) 2006 Christoph Pfisterer
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are
  10  * met:
  11  *
  12  *  * Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  *  * Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  *  * Neither the name of Christoph Pfisterer nor the names of the
  21  *    contributors may be used to endorse or promote products derived
  22  *    from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  34  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "global.h"
  38 #include "screen.h"
  39 #include "config.h"
  40 #include "libegint.h"
  41 #include "../include/refit_call_wrapper.h"
  42
  43 #include "../include/egemb_refind_banner.h"
  44
  45 // Console defines and variables
  46
  47 UINTN ConWidth;
  48 UINTN ConHeight;
  49 CHAR16 *BlankLine;
  50
  51 static VOID DrawScreenHeader(IN CHAR16 *Title);
  52
  53 // UGA defines and variables
  54
  55 UINTN UGAWidth;
  56 UINTN UGAHeight;
  57 BOOLEAN AllowGraphicsMode;
  58
  59 EG_PIXEL StdBackgroundPixel  = { 0xbf, 0xbf, 0xbf, 0 };
  60 EG_PIXEL MenuBackgroundPixel = { 0xbf, 0xbf, 0xbf, 0 };
  61
  62 static BOOLEAN GraphicsScreenDirty;
  63
  64 // general defines and variables
  65
  66 static BOOLEAN haveError = FALSE;
  67
  68 //
  69 // Screen initialization and switching
  70 //
  71
  72 VOID InitScreen(VOID)
  73 {
  74     UINTN i;
  75
  76     // initialize libeg
  77     egInitScreen();
  78
  79     if (egHasGraphicsMode()) {
  80         egGetScreenSize(&UGAWidth, &UGAHeight);
  81         AllowGraphicsMode = TRUE;
  82     } else {
  83         AllowGraphicsMode = FALSE;
  84         egSetGraphicsModeEnabled(FALSE);   // just to be sure we are in text mode
  85     }
  86     GraphicsScreenDirty = TRUE;
  87
  88     // disable cursor
  89     refit_call2_wrapper(ST->ConOut->EnableCursor, ST->ConOut, FALSE);
  90
  91     // get size of text console
  92     if (refit_call4_wrapper(ST->ConOut->QueryMode, ST->ConOut, ST->ConOut->Mode->Mode, &ConWidth, &ConHeight) != EFI_SUCCESS) {
  93         // use default values on error
  94         ConWidth = 80;
  95         ConHeight = 25;
  96     }
  97
  98     // make a buffer for a whole text line
  99     BlankLine = AllocatePool((ConWidth + 1) * sizeof(CHAR16));
 100     for (i = 0; i < ConWidth; i++)
 101         BlankLine[i] = ' ';
 102     BlankLine[i] = 0;
 103
 104     // show the banner (even when in graphics mode)
 105     DrawScreenHeader(L"Initializing...");
 106 }
 107
 108 VOID SetupScreen(VOID)
 109 {
 110     if (GlobalConfig.TextOnly) {
 111         // switch to text mode if requested
 112         AllowGraphicsMode = FALSE;
 113         SwitchToText(FALSE);
 114
 115     } else if (AllowGraphicsMode) {
 116         // clear screen and show banner
 117         // (now we know we'll stay in graphics mode)
 118         if ((GlobalConfig.RequestedScreenWidth > 0) && (GlobalConfig.RequestedScreenHeight > 0) &&
 119             egSetScreenSize(GlobalConfig.RequestedScreenWidth, GlobalConfig.RequestedScreenHeight)) {
 120               UGAWidth = GlobalConfig.RequestedScreenWidth;
 121               UGAHeight = GlobalConfig.RequestedScreenHeight;
 122         } // if user requested a particular screen resolution
 123         SwitchToGraphics();
 124         BltClearScreen(TRUE);
 125     }
 126 }
 127
 128 VOID SwitchToText(IN BOOLEAN CursorEnabled)
 129 {
 130     egSetGraphicsModeEnabled(FALSE);
 131     refit_call2_wrapper(ST->ConOut->EnableCursor, ST->ConOut, CursorEnabled);
 132 }
 133
 134 VOID SwitchToGraphics(VOID)
 135 {
 136     if (AllowGraphicsMode && !egIsGraphicsModeEnabled()) {
 137         egSetGraphicsModeEnabled(TRUE);
 138         GraphicsScreenDirty = TRUE;
 139     }
 140 }
 141
 142 //
 143 // Screen control for running tools
 144 //
 145
 146 VOID BeginTextScreen(IN CHAR16 *Title)
 147 {
 148     DrawScreenHeader(Title);
 149     SwitchToText(FALSE);
 150
 151     // reset error flag
 152     haveError = FALSE;
 153 }
 154
 155 VOID FinishTextScreen(IN BOOLEAN WaitAlways)
 156 {
 157     if (haveError || WaitAlways) {
 158         SwitchToText(FALSE);
 159         PauseForKey();
 160     }
 161
 162     // reset error flag
 163     haveError = FALSE;
 164 }
 165
 166 VOID BeginExternalScreen(IN BOOLEAN UseGraphicsMode, IN CHAR16 *Title)
 167 {
 168     EG_PIXEL DarkBackgroundPixel  = { 0x0, 0x0, 0x0, 0 };
 169
 170     if (!AllowGraphicsMode)
 171         UseGraphicsMode = FALSE;
 172
 173     if (UseGraphicsMode) {
 174         SwitchToGraphics();
 175         BltClearScreen(FALSE);
 176     } else {
 177        egClearScreen(&DarkBackgroundPixel);
 178        DrawScreenHeader(Title);
 179     } // if/else
 180
 181     // show the header
 182 //    DrawScreenHeader(Title);
 183
 184     if (!UseGraphicsMode)
 185         SwitchToText(TRUE);
 186
 187     // reset error flag
 188     haveError = FALSE;
 189 }
 190
 191 VOID FinishExternalScreen(VOID)
 192 {
 193     // make sure we clean up later
 194     GraphicsScreenDirty = TRUE;
 195
 196     if (haveError) {
 197         SwitchToText(FALSE);
 198         PauseForKey();
 199     }
 200
 201     // reset error flag
 202     haveError = FALSE;
 203 }
 204
 205 VOID TerminateScreen(VOID)
 206 {
 207     // clear text screen
 208     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
 209     refit_call1_wrapper(ST->ConOut->ClearScreen, ST->ConOut);
 210
 211     // enable cursor
 212     refit_call2_wrapper(ST->ConOut->EnableCursor, ST->ConOut, TRUE);
 213 }
 214
 215 static VOID DrawScreenHeader(IN CHAR16 *Title)
 216 {
 217     UINTN y;
 218
 219     // clear to black background
 220     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
 221     refit_call1_wrapper(ST->ConOut->ClearScreen, ST->ConOut);
 222
 223     // paint header background
 224     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BANNER);
 225     for (y = 0; y < 3; y++) {
 226         refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, y);
 227         Print(BlankLine);
 228     }
 229
 230     // print header text
 231     refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 3, 1);
 232     Print(L"rEFInd - %s", Title);
 233
 234     // reposition cursor
 235     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
 236     refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, 4);
 237 }
 238
 239 //
 240 // Keyboard input
 241 //
 242
 243 static BOOLEAN ReadAllKeyStrokes(VOID)
 244 {
 245     BOOLEAN       GotKeyStrokes;
 246     EFI_STATUS    Status;
 247     EFI_INPUT_KEY key;
 248
 249     GotKeyStrokes = FALSE;
 250     for (;;) {
 251         Status = refit_call2_wrapper(ST->ConIn->ReadKeyStroke, ST->ConIn, &key);
 252         if (Status == EFI_SUCCESS) {
 253             GotKeyStrokes = TRUE;
 254             continue;
 255         }
 256         break;
 257     }
 258     return GotKeyStrokes;
 259 }
 260
 261 VOID PauseForKey(VOID)
 262 {
 263     UINTN index;
 264
 265     Print(L"\n* Hit any key to continue *");
 266
 267     if (ReadAllKeyStrokes()) {  // remove buffered key strokes
 268         refit_call1_wrapper(BS->Stall, 5000000);     // 5 seconds delay
 269         ReadAllKeyStrokes();    // empty the buffer again
 270     }
 271
 272     refit_call3_wrapper(BS->WaitForEvent, 1, &ST->ConIn->WaitForKey, &index);
 273     ReadAllKeyStrokes();        // empty the buffer to protect the menu
 274
 275     Print(L"\n");
 276 }
 277
 278 #if REFIT_DEBUG > 0
 279 VOID DebugPause(VOID)
 280 {
 281     // show console and wait for key
 282     SwitchToText(FALSE);
 283     PauseForKey();
 284
 285     // reset error flag
 286     haveError = FALSE;
 287 }
 288 #endif
 289
 290 VOID EndlessIdleLoop(VOID)
 291 {
 292     UINTN index;
 293
 294     for (;;) {
 295         ReadAllKeyStrokes();
 296         refit_call3_wrapper(BS->WaitForEvent, 1, &ST->ConIn->WaitForKey, &index);
 297     }
 298 }
 299
 300 //
 301 // Error handling
 302 //
 303
 304 #ifdef __MAKEWITH_GNUEFI
 305 BOOLEAN CheckFatalError(IN EFI_STATUS Status, IN CHAR16 *where)
 306 {
 307     CHAR16 ErrorName[64];
 308
 309     if (!EFI_ERROR(Status))
 310         return FALSE;
 311
 312     StatusToString(ErrorName, Status);
 313     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_ERROR);
 314     Print(L"Fatal Error: %s %s\n", ErrorName, where);
 315     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
 316     haveError = TRUE;
 317
 318     //BS->Exit(ImageHandle, ExitStatus, ExitDataSize, ExitData);
 319
 320     return TRUE;
 321 }
 322
 323 BOOLEAN CheckError(IN EFI_STATUS Status, IN CHAR16 *where)
 324 {
 325     CHAR16 ErrorName[64];
 326
 327     if (!EFI_ERROR(Status))
 328         return FALSE;
 329
 330     StatusToString(ErrorName, Status);
 331     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_ERROR);
 332     Print(L"Error: %s %s\n", ErrorName, where);
 333     refit_call2_wrapper(ST->ConOut->SetAttribute, ST->ConOut, ATTR_BASIC);
 334     haveError = TRUE;
 335
 336     return TRUE;
 337 }
 338 #else
 339 BOOLEAN CheckFatalError(IN EFI_STATUS Status, IN CHAR16 *where)
 340 {
 341 //    CHAR16 ErrorName[64];
 342
 343     if (!EFI_ERROR(Status))
 344         return FALSE;
 345
 346 //    StatusToString(ErrorName, Status);
 347     gST->ConOut->SetAttribute (gST->ConOut, ATTR_ERROR);
 348     Print(L"Fatal Error: %r %s\n", Status, where);
 349     gST->ConOut->SetAttribute (gST->ConOut, ATTR_BASIC);
 350     haveError = TRUE;
 351
 352     //gBS->Exit(ImageHandle, ExitStatus, ExitDataSize, ExitData);
 353
 354     return TRUE;
 355 }
 356
 357 BOOLEAN CheckError(IN EFI_STATUS Status, IN CHAR16 *where)
 358 {
 359 //    CHAR16 ErrorName[64];
 360
 361     if (!EFI_ERROR(Status))
 362         return FALSE;
 363
 364 //    StatusToString(ErrorName, Status);
 365     gST->ConOut->SetAttribute (gST->ConOut, ATTR_ERROR);
 366     Print(L"Error: %r %s\n", Status, where);
 367     gST->ConOut->SetAttribute (gST->ConOut, ATTR_BASIC);
 368     haveError = TRUE;
 369
 370     return TRUE;
 371 }
 372 #endif
 373
 374 //
 375 // Graphics functions
 376 //
 377
 378 VOID SwitchToGraphicsAndClear(VOID)
 379 {
 380     SwitchToGraphics();
 381     if (GraphicsScreenDirty)
 382         BltClearScreen(TRUE);
 383 }
 384
 385 VOID BltClearScreen(IN BOOLEAN ShowBanner)
 386 {
 387     static EG_IMAGE *Banner = NULL;
 388
 389     if (ShowBanner && !(GlobalConfig.HideUIFlags & HIDEUI_FLAG_BANNER)) {
 390         // load banner on first call
 391         if (Banner == NULL) {
 392             if (GlobalConfig.BannerFileName == NULL)
 393                 Banner = egPrepareEmbeddedImage(&egemb_refind_banner, FALSE);
 394             else
 395                 Banner = egLoadImage(SelfDir, GlobalConfig.BannerFileName, FALSE);
 396             if (Banner != NULL)
 397                 MenuBackgroundPixel = Banner->PixelData[0];
 398         }
 399
 400         // clear and draw banner
 401         egClearScreen(&MenuBackgroundPixel);
 402         if (Banner != NULL)
 403             BltImage(Banner, (UGAWidth - Banner->Width) >> 1,
 404                      ((UGAHeight - LAYOUT_TOTAL_HEIGHT) >> 1) + LAYOUT_BANNER_HEIGHT - Banner->Height);
 405
 406     } else {
 407         // clear to standard background color
 408         egClearScreen(&StdBackgroundPixel);
 409     }
 410
 411     GraphicsScreenDirty = FALSE;
 412 }
 413
 414 VOID BltImage(IN EG_IMAGE *Image, IN UINTN XPos, IN UINTN YPos)
 415 {
 416     egDrawImage(Image, XPos, YPos);
 417     GraphicsScreenDirty = TRUE;
 418 }
 419
 420 VOID BltImageAlpha(IN EG_IMAGE *Image, IN UINTN XPos, IN UINTN YPos, IN EG_PIXEL *BackgroundPixel)
 421 {
 422     EG_IMAGE *CompImage;
 423
 424     // compose on background
 425     CompImage = egCreateFilledImage(Image->Width, Image->Height, FALSE, BackgroundPixel);
 426     egComposeImage(CompImage, Image, 0, 0);
 427
 428     // blit to screen and clean up
 429     egDrawImage(CompImage, XPos, YPos);
 430     egFreeImage(CompImage);
 431     GraphicsScreenDirty = TRUE;
 432 }
 433
 434 // VOID BltImageComposite(IN EG_IMAGE *BaseImage, IN EG_IMAGE *TopImage, IN UINTN XPos, IN UINTN YPos)
 435 // {
 436 //     UINTN TotalWidth, TotalHeight, CompWidth, CompHeight, OffsetX, OffsetY;
 437 //     EG_IMAGE *CompImage;
 438 //
 439 //     // initialize buffer with base image
 440 //     CompImage = egCopyImage(BaseImage);
 441 //     TotalWidth  = BaseImage->Width;
 442 //     TotalHeight = BaseImage->Height;
 443 //
 444 //     // place the top image
 445 //     CompWidth = TopImage->Width;
 446 //     if (CompWidth > TotalWidth)
 447 //         CompWidth = TotalWidth;
 448 //     OffsetX = (TotalWidth - CompWidth) >> 1;
 449 //     CompHeight = TopImage->Height;
 450 //     if (CompHeight > TotalHeight)
 451 //         CompHeight = TotalHeight;
 452 //     OffsetY = (TotalHeight - CompHeight) >> 1;
 453 //     egComposeImage(CompImage, TopImage, OffsetX, OffsetY);
 454 //
 455 //     // blit to screen and clean up
 456 //     egDrawImage(CompImage, XPos, YPos);
 457 //     egFreeImage(CompImage);
 458 //     GraphicsScreenDirty = TRUE;
 459 // }
 460
 461 VOID BltImageCompositeBadge(IN EG_IMAGE *BaseImage, IN EG_IMAGE *TopImage, IN EG_IMAGE *BadgeImage, IN UINTN XPos, IN UINTN YPos)
 462 {
 463      UINTN TotalWidth = 0, TotalHeight = 0, CompWidth = 0, CompHeight = 0, OffsetX = 0, OffsetY = 0;
 464      EG_IMAGE *CompImage = NULL;
 465
 466      // initialize buffer with base image
 467      if (BaseImage != NULL) {
 468          CompImage = egCopyImage(BaseImage);
 469          TotalWidth  = BaseImage->Width;
 470          TotalHeight = BaseImage->Height;
 471      }
 472
 473      // place the top image
 474      if ((TopImage != NULL) && (CompImage != NULL)) {
 475          CompWidth = TopImage->Width;
 476          if (CompWidth > TotalWidth)
 477                CompWidth = TotalWidth;
 478          OffsetX = (TotalWidth - CompWidth) >> 1;
 479          CompHeight = TopImage->Height;
 480          if (CompHeight > TotalHeight)
 481                CompHeight = TotalHeight;
 482          OffsetY = (TotalHeight - CompHeight) >> 1;
 483          egComposeImage(CompImage, TopImage, OffsetX, OffsetY);
 484      }
 485
 486      // place the badge image
 487      if (BadgeImage != NULL && CompImage != NULL && (BadgeImage->Width + 8) < CompWidth && (BadgeImage->Height + 8) < CompHeight) {
 488          OffsetX += CompWidth  - 8 - BadgeImage->Width;
 489          OffsetY += CompHeight - 8 - BadgeImage->Height;
 490          egComposeImage(CompImage, BadgeImage, OffsetX, OffsetY);
 491      }
 492
 493      // blit to screen and clean up
 494      egDrawImage(CompImage, XPos, YPos);
 495      egFreeImage(CompImage);
 496      GraphicsScreenDirty = TRUE;
 497 }
 498
 499 // Line-editing functions borrowed from gummiboot (cursor_left(), cursor_right(), & line_edit()).
 500 // gummiboot is copyright (c) 2012 by Kay Sievers <kay.sievers@vrfy.org> and Harald Hoyer
 501 // <harald@redhat.com> and is licensed under the LGPL 2.1.
 502
 503 static void cursor_left(UINTN *cursor, UINTN *first)
 504 {
 505    if ((*cursor) > 0)
 506       (*cursor)--;
 507    else if ((*first) > 0)
 508       (*first)--;
 509 }
 510
 511 static void cursor_right(UINTN *cursor, UINTN *first, UINTN x_max, UINTN len)
 512 {
 513    if ((*cursor)+2 < x_max)
 514       (*cursor)++;
 515    else if ((*first) + (*cursor) < len)
 516       (*first)++;
 517 }
 518
 519 BOOLEAN line_edit(CHAR16 *line_in, CHAR16 **line_out, UINTN x_max, UINTN y_pos) {
 520    CHAR16 *line;
 521    UINTN size;
 522    UINTN len;
 523    UINTN first;
 524    CHAR16 *print;
 525    UINTN cursor;
 526    BOOLEAN exit;
 527    BOOLEAN enter;
 528
 529    if (!line_in)
 530       line_in = L"";
 531    size = StrLen(line_in) + 1024;
 532    line = AllocatePool(size * sizeof(CHAR16));
 533    StrCpy(line, line_in);
 534    len = StrLen(line);
 535    print = AllocatePool(x_max * sizeof(CHAR16));
 536
 537    refit_call2_wrapper(ST->ConOut->EnableCursor, ST->ConOut, TRUE);
 538
 539    first = 0;
 540    cursor = 0;
 541    enter = FALSE;
 542    exit = FALSE;
 543    while (!exit) {
 544       UINTN index;
 545       EFI_STATUS err;
 546       EFI_INPUT_KEY key;
 547       UINTN i;
 548
 549       i = len - first;
 550       if (i >= x_max-2)
 551          i = x_max-2;
 552       CopyMem(print, line + first, i * sizeof(CHAR16));
 553       print[i++] = ' ';
 554       print[i] = '\0';
 555
 556       refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, 0, y_pos);
 557       refit_call2_wrapper(ST->ConOut->OutputString, ST->ConOut, print);
 558       refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, cursor, y_pos);
 559
 560       refit_call3_wrapper(BS->WaitForEvent, 1, &ST->ConIn->WaitForKey, &index);
 561       err = refit_call2_wrapper(ST->ConIn->ReadKeyStroke, ST->ConIn, &key);
 562       if (EFI_ERROR(err))
 563          continue;
 564
 565       switch (key.ScanCode) {
 566       case SCAN_ESC:
 567          exit = TRUE;
 568          break;
 569       case SCAN_HOME:
 570          cursor = 0;
 571          first = 0;
 572          continue;
 573       case SCAN_END:
 574          cursor = len;
 575          if (cursor >= x_max) {
 576             cursor = x_max-2;
 577             first = len - (x_max-2);
 578          }
 579          continue;
 580       case SCAN_UP:
 581          while((first + cursor) && line[first + cursor] == ' ')
 582             cursor_left(&cursor, &first);
 583          while((first + cursor) && line[first + cursor] != ' ')
 584             cursor_left(&cursor, &first);
 585          while((first + cursor) && line[first + cursor] == ' ')
 586             cursor_left(&cursor, &first);
 587          if (first + cursor != len && first + cursor)
 588             cursor_right(&cursor, &first, x_max, len);
 589          refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, cursor, y_pos);
 590          continue;
 591       case SCAN_DOWN:
 592          while(line[first + cursor] && line[first + cursor] == ' ')
 593             cursor_right(&cursor, &first, x_max, len);
 594          while(line[first + cursor] && line[first + cursor] != ' ')
 595             cursor_right(&cursor, &first, x_max, len);
 596          while(line[first + cursor] && line[first + cursor] == ' ')
 597               cursor_right(&cursor, &first, x_max, len);
 598          refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, cursor, y_pos);
 599          continue;
 600       case SCAN_RIGHT:
 601          if (first + cursor == len)
 602             continue;
 603          cursor_right(&cursor, &first, x_max, len);
 604          refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, cursor, y_pos);
 605          continue;
 606       case SCAN_LEFT:
 607          cursor_left(&cursor, &first);
 608          refit_call3_wrapper(ST->ConOut->SetCursorPosition, ST->ConOut, cursor, y_pos);
 609          continue;
 610       case SCAN_DELETE:
 611          if (len == 0)
 612             continue;
 613          if (first + cursor == len)
 614             continue;
 615          for (i = first + cursor; i < len; i++)
 616             line[i] = line[i+1];
 617          line[len-1] = ' ';
 618          len--;
 619          continue;
 620       }
 621
 622       switch (key.UnicodeChar) {
 623       case CHAR_LINEFEED:
 624       case CHAR_CARRIAGE_RETURN:
 625          if (StrCmp(line, line_in) != 0) {
 626             *line_out = line;
 627             line = NULL;
 628          }
 629          enter = TRUE;
 630          exit = TRUE;
 631          break;
 632       case CHAR_BACKSPACE:
 633          if (len == 0)
 634             continue;
 635          if (first == 0 && cursor == 0)
 636             continue;
 637          for (i = first + cursor-1; i < len; i++)
 638             line[i] = line[i+1];
 639          len--;
 640          if (cursor > 0)
 641             cursor--;
 642          if (cursor > 0 || first == 0)
 643             continue;
 644          /* show full line if it fits */
 645          if (len < x_max-2) {
 646             cursor = first;
 647             first = 0;
 648             continue;
 649          }
 650          /* jump left to see what we delete */
 651          if (first > 10) {
 652             first -= 10;
 653             cursor = 10;
 654          } else {
 655             cursor = first;
 656             first = 0;
 657          }
 658          continue;
 659       case '\t':
 660       case ' ' ... '~':
 661       case 0x80 ... 0xffff:
 662          if (len+1 == size)
 663             continue;
 664          for (i = len; i > first + cursor; i--)
 665             line[i] = line[i-1];
 666          line[first + cursor] = key.UnicodeChar;
 667          len++;
 668          line[len] = '\0';
 669          if (cursor+2 < x_max)
 670             cursor++;
 671          else if (first + cursor < len)
 672             first++;
 673          continue;
 674       }
 675    }
 676
 677    refit_call2_wrapper(ST->ConOut->EnableCursor, ST->ConOut, FALSE);
 678    FreePool(print);
 679    FreePool(line);
 680    return enter;
 681 } /* BOOLEAN line_edit() */