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

   1 /*
   2  * refit/config.c
   3  * Configuration file 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 /*
  38  * Modifications copyright (c) 2012 Roderick W. Smith
  39  *
  40  * Modifications distributed under the terms of the GNU General Public
  41  * License (GPL) version 3 (GPLv3), a copy of which must be distributed
  42  * with this source code or binaries made from it.
  43  *
  44  */
  45
  46 #include "global.h"
  47 #include "lib.h"
  48 #include "icns.h"
  49 #include "menu.h"
  50 #include "config.h"
  51 #include "screen.h"
  52 #include "refit_call_wrapper.h"
  53
  54 // constants
  55
  56 #define CONFIG_FILE_NAME         L"refind.conf"
  57 #define LINUX_OPTIONS_FILENAMES  L"refind_linux.conf,refind-linux.conf,linux.conf"
  58 #define MAXCONFIGFILESIZE        (128*1024)
  59
  60 #define ENCODING_ISO8859_1  (0)
  61 #define ENCODING_UTF8       (1)
  62 #define ENCODING_UTF16_LE   (2)
  63
  64 static REFIT_MENU_ENTRY MenuEntryReturn   = { L"Return to Main Menu", TAG_RETURN, 0, 0, 0, NULL, NULL, NULL };
  65
  66 //
  67 // read a file into a buffer
  68 //
  69
  70 static EFI_STATUS ReadFile(IN EFI_FILE_HANDLE BaseDir, CHAR16 *FileName, REFIT_FILE *File)
  71 {
  72     EFI_STATUS      Status;
  73     EFI_FILE_HANDLE FileHandle;
  74     EFI_FILE_INFO   *FileInfo;
  75     UINT64          ReadSize;
  76
  77     File->Buffer = NULL;
  78     File->BufferSize = 0;
  79
  80     // read the file, allocating a buffer on the way
  81     Status = refit_call5_wrapper(BaseDir->Open, BaseDir, &FileHandle, FileName, EFI_FILE_MODE_READ, 0);
  82     if (CheckError(Status, L"while loading the configuration file"))
  83         return Status;
  84
  85     FileInfo = LibFileInfo(FileHandle);
  86     if (FileInfo == NULL) {
  87         // TODO: print and register the error
  88         refit_call1_wrapper(FileHandle->Close, FileHandle);
  89         return EFI_LOAD_ERROR;
  90     }
  91     ReadSize = FileInfo->FileSize;
  92     if (ReadSize > MAXCONFIGFILESIZE)
  93         ReadSize = MAXCONFIGFILESIZE;
  94     FreePool(FileInfo);
  95
  96     File->BufferSize = (UINTN)ReadSize;   // was limited to a few K before, so this is safe
  97     File->Buffer = AllocatePool(File->BufferSize);
  98     Status = refit_call3_wrapper(FileHandle->Read, FileHandle, &File->BufferSize, File->Buffer);
  99     if (CheckError(Status, L"while loading the configuration file")) {
 100         FreePool(File->Buffer);
 101         File->Buffer = NULL;
 102         refit_call1_wrapper(FileHandle->Close, FileHandle);
 103         return Status;
 104     }
 105     Status = refit_call1_wrapper(FileHandle->Close, FileHandle);
 106
 107     // setup for reading
 108     File->Current8Ptr  = (CHAR8 *)File->Buffer;
 109     File->End8Ptr      = File->Current8Ptr + File->BufferSize;
 110     File->Current16Ptr = (CHAR16 *)File->Buffer;
 111     File->End16Ptr     = File->Current16Ptr + (File->BufferSize >> 1);
 112
 113     // detect encoding
 114     File->Encoding = ENCODING_ISO8859_1;   // default: 1:1 translation of CHAR8 to CHAR16
 115     if (File->BufferSize >= 4) {
 116         if (File->Buffer[0] == 0xFF && File->Buffer[1] == 0xFE) {
 117             // BOM in UTF-16 little endian (or UTF-32 little endian)
 118             File->Encoding = ENCODING_UTF16_LE;   // use CHAR16 as is
 119             File->Current16Ptr++;
 120         } else if (File->Buffer[0] == 0xEF && File->Buffer[1] == 0xBB && File->Buffer[2] == 0xBF) {
 121             // BOM in UTF-8
 122             File->Encoding = ENCODING_UTF8;       // translate from UTF-8 to UTF-16
 123             File->Current8Ptr += 3;
 124         } else if (File->Buffer[1] == 0 && File->Buffer[3] == 0) {
 125             File->Encoding = ENCODING_UTF16_LE;   // use CHAR16 as is
 126         }
 127         // TODO: detect other encodings as they are implemented
 128     }
 129
 130     return EFI_SUCCESS;
 131 }
 132
 133 //
 134 // get a single line of text from a file
 135 //
 136
 137 static CHAR16 *ReadLine(REFIT_FILE *File)
 138 {
 139     CHAR16  *Line, *q;
 140     UINTN   LineLength;
 141
 142     if (File->Buffer == NULL)
 143         return NULL;
 144
 145     if (File->Encoding == ENCODING_ISO8859_1 || File->Encoding == ENCODING_UTF8) {
 146
 147         CHAR8 *p, *LineStart, *LineEnd;
 148
 149         p = File->Current8Ptr;
 150         if (p >= File->End8Ptr)
 151             return NULL;
 152
 153         LineStart = p;
 154         for (; p < File->End8Ptr; p++)
 155             if (*p == 13 || *p == 10)
 156                 break;
 157         LineEnd = p;
 158         for (; p < File->End8Ptr; p++)
 159             if (*p != 13 && *p != 10)
 160                 break;
 161         File->Current8Ptr = p;
 162
 163         LineLength = (UINTN)(LineEnd - LineStart) + 1;
 164         Line = AllocatePool(LineLength * sizeof(CHAR16));
 165         if (Line == NULL)
 166             return NULL;
 167
 168         q = Line;
 169         if (File->Encoding == ENCODING_ISO8859_1) {
 170             for (p = LineStart; p < LineEnd; )
 171                 *q++ = *p++;
 172         } else if (File->Encoding == ENCODING_UTF8) {
 173             // TODO: actually handle UTF-8
 174             for (p = LineStart; p < LineEnd; )
 175                 *q++ = *p++;
 176         }
 177         *q = 0;
 178
 179     } else if (File->Encoding == ENCODING_UTF16_LE) {
 180
 181         CHAR16 *p, *LineStart, *LineEnd;
 182
 183         p = File->Current16Ptr;
 184         if (p >= File->End16Ptr)
 185             return NULL;
 186
 187         LineStart = p;
 188         for (; p < File->End16Ptr; p++)
 189             if (*p == 13 || *p == 10)
 190                 break;
 191         LineEnd = p;
 192         for (; p < File->End16Ptr; p++)
 193             if (*p != 13 && *p != 10)
 194                 break;
 195         File->Current16Ptr = p;
 196
 197         LineLength = (UINTN)(LineEnd - LineStart) + 1;
 198         Line = AllocatePool(LineLength * sizeof(CHAR16));
 199         if (Line == NULL)
 200             return NULL;
 201
 202         for (p = LineStart, q = Line; p < LineEnd; )
 203             *q++ = *p++;
 204         *q = 0;
 205
 206     } else
 207         return NULL;   // unsupported encoding
 208
 209     return Line;
 210 }
 211
 212 //
 213 // get a line of tokens from a file
 214 //
 215
 216 UINTN ReadTokenLine(IN REFIT_FILE *File, OUT CHAR16 ***TokenList)
 217 {
 218     BOOLEAN         LineFinished, IsQuoted = FALSE;
 219     CHAR16          *Line, *Token, *p;
 220     UINTN           TokenCount = 0;
 221
 222     *TokenList = NULL;
 223
 224     while (TokenCount == 0) {
 225         Line = ReadLine(File);
 226         if (Line == NULL)
 227             return(0);
 228
 229         p = Line;
 230         LineFinished = FALSE;
 231         while (!LineFinished) {
 232             // skip whitespace
 233             while ((*p == ' ' || *p == '\t' || *p == '=' || *p == ',') && !IsQuoted)
 234                 p++;
 235             if (*p == 0 || *p == '#')
 236                 break;
 237
 238             if (*p == '"') {
 239                IsQuoted = !IsQuoted;
 240                p++;
 241             } // if
 242             Token = p;
 243
 244             // find end of token
 245             while (*p && *p != '"' && ((*p != ' ' && *p != '\t' && *p != '=' && *p != '#' && *p != ',') || IsQuoted)) {
 246                if ((*p == '/') && !IsQuoted) // Switch Unix-style to DOS-style directory separators
 247                   *p = '\\';
 248                p++;
 249             } // if
 250             if (*p == '"')
 251                IsQuoted = !IsQuoted;
 252             if (*p == 0 || *p == '#')
 253                 LineFinished = TRUE;
 254             *p++ = 0;
 255
 256             AddListElement((VOID ***)TokenList, &TokenCount, (VOID *)StrDuplicate(Token));
 257         }
 258
 259         FreePool(Line);
 260     }
 261     return (TokenCount);
 262 } /* ReadTokenLine() */
 263
 264 VOID FreeTokenLine(IN OUT CHAR16 ***TokenList, IN OUT UINTN *TokenCount)
 265 {
 266     // TODO: also free the items
 267     FreeList((VOID ***)TokenList, TokenCount);
 268 }
 269
 270 // handle a parameter with a single integer argument
 271 static VOID HandleInt(IN CHAR16 **TokenList, IN UINTN TokenCount, OUT UINTN *Value)
 272 {
 273     if (TokenCount == 2)
 274        *Value = Atoi(TokenList[1]);
 275 }
 276
 277 // handle a parameter with a single string argument
 278 static VOID HandleString(IN CHAR16 **TokenList, IN UINTN TokenCount, OUT CHAR16 **Target) {
 279    if (TokenCount == 2) {
 280       if (*Target != NULL)
 281          FreePool(*Target);
 282       *Target = StrDuplicate(TokenList[1]);
 283    } // if
 284 } // static VOID HandleString()
 285
 286 // Handle a parameter with a series of string arguments, to be added to a comma-delimited
 287 // list
 288 static VOID HandleStrings(IN CHAR16 **TokenList, IN UINTN TokenCount, OUT CHAR16 **Target) {
 289    UINTN i;
 290
 291    if (*Target != NULL) {
 292       FreePool(*Target);
 293       *Target = NULL;
 294    } // if
 295     for (i = 1; i < TokenCount; i++)
 296        MergeStrings(Target, TokenList[i], L',');
 297 } // static VOID HandleStrings()
 298
 299 // read config file
 300 VOID ReadConfig(VOID)
 301 {
 302     EFI_STATUS      Status;
 303     REFIT_FILE      File;
 304     CHAR16          **TokenList;
 305     CHAR16          *FlagName;
 306     UINTN           TokenCount, i;
 307
 308     if (!FileExists(SelfDir, CONFIG_FILE_NAME)) {
 309         Print(L"Configuration file missing!\n");
 310         return;
 311     }
 312
 313     Status = ReadFile(SelfDir, CONFIG_FILE_NAME, &File);
 314     if (EFI_ERROR(Status))
 315         return;
 316
 317     for (;;) {
 318         TokenCount = ReadTokenLine(&File, &TokenList);
 319         if (TokenCount == 0)
 320             break;
 321
 322         if (StriCmp(TokenList[0], L"timeout") == 0) {
 323             HandleInt(TokenList, TokenCount, &(GlobalConfig.Timeout));
 324
 325         } else if (StriCmp(TokenList[0], L"hideui") == 0) {
 326             for (i = 1; i < TokenCount; i++) {
 327                 FlagName = TokenList[i];
 328                 if (StriCmp(FlagName, L"banner") == 0) {
 329                    GlobalConfig.HideUIFlags |= HIDEUI_FLAG_BANNER;
 330                 } else if (StriCmp(FlagName, L"label") == 0) {
 331                    GlobalConfig.HideUIFlags |= HIDEUI_FLAG_LABEL;
 332                 } else if (StriCmp(FlagName, L"singleuser") == 0) {
 333                     GlobalConfig.HideUIFlags |= HIDEUI_FLAG_SINGLEUSER;
 334                 } else if (StriCmp(FlagName, L"hwtest") == 0) {
 335                     GlobalConfig.HideUIFlags |= HIDEUI_FLAG_HWTEST;
 336                 } else if (StriCmp(FlagName, L"arrows") == 0) {
 337                    GlobalConfig.HideUIFlags |= HIDEUI_FLAG_ARROWS;
 338                 } else if (StriCmp(FlagName, L"all") == 0) {
 339                     GlobalConfig.HideUIFlags = HIDEUI_ALL;
 340                 } else {
 341                     Print(L" unknown hideui flag: '%s'\n", FlagName);
 342                 }
 343             }
 344
 345         } else if (StriCmp(TokenList[0], L"icons_dir") == 0) {
 346            HandleString(TokenList, TokenCount, &(GlobalConfig.IconsDir));
 347
 348         } else if (StriCmp(TokenList[0], L"scanfor") == 0) {
 349            for (i = 0; i < NUM_SCAN_OPTIONS; i++) {
 350               if (i < TokenCount)
 351                  GlobalConfig.ScanFor[i] = TokenList[i][0];
 352               else
 353                  GlobalConfig.ScanFor[i] = ' ';
 354            }
 355
 356         } else if (StriCmp(TokenList[0], L"also_scan_dirs") == 0) {
 357             HandleStrings(TokenList, TokenCount, &(GlobalConfig.AlsoScan));
 358
 359         } else if (StriCmp(TokenList[0], L"scan_driver_dirs") == 0) {
 360             HandleStrings(TokenList, TokenCount, &(GlobalConfig.DriverDirs));
 361
 362         } else if (StriCmp(TokenList[0], L"showtools") == 0) {
 363             SetMem(GlobalConfig.ShowTools, NUM_TOOLS * sizeof(UINTN), 0);
 364             for (i = 1; (i < TokenCount) && (i < NUM_TOOLS); i++) {
 365                 FlagName = TokenList[i];
 366                 if (StriCmp(FlagName, L"shell") == 0) {
 367                     GlobalConfig.ShowTools[i - 1] = TAG_SHELL;
 368                 } else if (StriCmp(FlagName, L"gptsync") == 0) {
 369                     GlobalConfig.ShowTools[i - 1] = TAG_GPTSYNC;
 370                 } else if (StriCmp(FlagName, L"about") == 0) {
 371                    GlobalConfig.ShowTools[i - 1] = TAG_ABOUT;
 372                 } else if (StriCmp(FlagName, L"exit") == 0) {
 373                    GlobalConfig.ShowTools[i - 1] = TAG_EXIT;
 374                 } else if (StriCmp(FlagName, L"reboot") == 0) {
 375                    GlobalConfig.ShowTools[i - 1] = TAG_REBOOT;
 376                 } else if (StriCmp(FlagName, L"shutdown") == 0) {
 377                    GlobalConfig.ShowTools[i - 1] = TAG_SHUTDOWN;
 378                 } else {
 379                    Print(L" unknown showtools flag: '%s'\n", FlagName);
 380                 }
 381             } // showtools options
 382
 383         } else if (StriCmp(TokenList[0], L"banner") == 0) {
 384            HandleString(TokenList, TokenCount, &(GlobalConfig.BannerFileName));
 385
 386         } else if (StriCmp(TokenList[0], L"selection_small") == 0) {
 387            HandleString(TokenList, TokenCount, &(GlobalConfig.SelectionSmallFileName));
 388
 389         } else if (StriCmp(TokenList[0], L"selection_big") == 0) {
 390            HandleString(TokenList, TokenCount, &(GlobalConfig.SelectionBigFileName));
 391
 392         } else if (StriCmp(TokenList[0], L"default_selection") == 0) {
 393            HandleString(TokenList, TokenCount, &(GlobalConfig.DefaultSelection));
 394
 395         } else if (StriCmp(TokenList[0], L"textonly") == 0) {
 396             GlobalConfig.TextOnly = TRUE;
 397
 398         } else if ((StriCmp(TokenList[0], L"resolution") == 0) && (TokenCount == 3)) {
 399            GlobalConfig.RequestedScreenWidth = Atoi(TokenList[1]);
 400            GlobalConfig.RequestedScreenHeight = Atoi(TokenList[2]);
 401
 402         } else if (StriCmp(TokenList[0], L"scan_all_linux_kernels") == 0) {
 403            GlobalConfig.ScanAllLinux = TRUE;
 404
 405         } else if (StriCmp(TokenList[0], L"max_tags") == 0) {
 406            HandleInt(TokenList, TokenCount, &(GlobalConfig.MaxTags));
 407         }
 408
 409         FreeTokenLine(&TokenList, &TokenCount);
 410     }
 411     FreePool(File.Buffer);
 412 } /* VOID ReadConfig() */
 413
 414 static VOID AddSubmenu(LOADER_ENTRY *Entry, REFIT_FILE *File, REFIT_VOLUME *Volume, CHAR16 *Title) {
 415    REFIT_MENU_SCREEN  *SubScreen;
 416    LOADER_ENTRY       *SubEntry;
 417    UINTN              TokenCount;
 418    CHAR16             **TokenList;
 419
 420    SubScreen = InitializeSubScreen(Entry);
 421
 422    // Set defaults for the new entry; will be modified based on lines read from the config. file....
 423    SubEntry = InitializeLoaderEntry(Entry);
 424
 425    if ((SubEntry == NULL) || (SubScreen == NULL))
 426       return;
 427    SubEntry->me.Title        = StrDuplicate(Title);
 428
 429    while (((TokenCount = ReadTokenLine(File, &TokenList)) > 0) && (StriCmp(TokenList[0], L"}") != 0)) {
 430       if ((StriCmp(TokenList[0], L"loader") == 0) && (TokenCount > 1)) { // set the boot loader filename
 431          if (SubEntry->LoaderPath != NULL)
 432             FreePool(SubEntry->LoaderPath);
 433          SubEntry->LoaderPath = StrDuplicate(TokenList[1]);
 434          SubEntry->DevicePath = FileDevicePath(Volume->DeviceHandle, SubEntry->LoaderPath);
 435       } else if (StriCmp(TokenList[0], L"initrd") == 0) {
 436          if (SubEntry->InitrdPath != NULL)
 437             FreePool(SubEntry->InitrdPath);
 438          SubEntry->InitrdPath = NULL;
 439          if (TokenCount > 1) {
 440             SubEntry->InitrdPath = StrDuplicate(TokenList[1]);
 441          }
 442       } else if (StriCmp(TokenList[0], L"options") == 0) {
 443          if (SubEntry->LoadOptions != NULL)
 444             FreePool(SubEntry->LoadOptions);
 445          SubEntry->LoadOptions = NULL;
 446          if (TokenCount > 1) {
 447             SubEntry->LoadOptions = StrDuplicate(TokenList[1]);
 448          } // if/else
 449       } else if ((StriCmp(TokenList[0], L"add_options") == 0) && (TokenCount > 1)) {
 450          MergeStrings(&SubEntry->LoadOptions, TokenList[1], L' ');
 451       } else if ((StriCmp(TokenList[0], L"graphics") == 0) && (TokenCount > 1)) {
 452          SubEntry->UseGraphicsMode = (StriCmp(TokenList[1], L"on") == 0);
 453       } else if (StriCmp(TokenList[0], L"disabled") == 0) {
 454          SubEntry->Enabled = FALSE;
 455       } // ief/elseif
 456       FreeTokenLine(&TokenList, &TokenCount);
 457    } // while()
 458    if (SubEntry->InitrdPath != NULL) {
 459       MergeStrings(&SubEntry->LoadOptions, L"initrd=", L' ');
 460       MergeStrings(&SubEntry->LoadOptions, SubEntry->InitrdPath, 0);
 461       FreePool(SubEntry->InitrdPath);
 462       SubEntry->InitrdPath = NULL;
 463    } // if
 464    if (SubEntry->Enabled == TRUE) {
 465       AddMenuEntry(SubScreen, (REFIT_MENU_ENTRY *)SubEntry);
 466    }
 467    Entry->me.SubScreen = SubScreen;
 468 } // VOID AddSubmenu()
 469
 470 // Finds a volume with the specified Identifier (a volume label or a number
 471 // followed by a colon, for the moment). If found, sets *Volume to point to
 472 // that volume. If not, leaves it unchanged.
 473 // Returns TRUE if a match was found, FALSE if not.
 474 static BOOLEAN FindVolume(REFIT_VOLUME **Volume, CHAR16 *Identifier) {
 475    UINTN     i = 0, CountedVolumes = 0;
 476    INTN      Number = -1;
 477    BOOLEAN   Found = FALSE;
 478
 479    if ((StrLen(Identifier) >= 2) && (Identifier[StrLen(Identifier) - 1] == L':') &&
 480        (Identifier[0] >= L'0') && (Identifier[0] <= L'9')) {
 481       Number = (INTN) Atoi(Identifier);
 482    }
 483    while ((i < VolumesCount) && (!Found)) {
 484       if (Number >= 0) { // User specified a volume by number
 485          if (Volumes[i]->IsReadable) {
 486             if (CountedVolumes == Number) {
 487                *Volume = Volumes[i];
 488                Found = TRUE;
 489             }
 490             CountedVolumes++;
 491          } // if
 492       } else { // User specified a volume by label
 493          if (StriCmp(Identifier, Volumes[i]->VolName) == 0) {
 494             *Volume = Volumes[i];
 495             Found = TRUE;
 496          } // if
 497       } // if/else
 498       i++;
 499    } // while()
 500    return (Found);
 501 } // static VOID FindVolume()
 502
 503 // Adds the options from a SINGLE refind.conf stanza to a new loader entry and returns
 504 // that entry. The calling function is then responsible for adding the entry to the
 505 // list of entries.
 506 static LOADER_ENTRY * AddStanzaEntries(REFIT_FILE *File, REFIT_VOLUME *Volume, CHAR16 *Title) {
 507    CHAR16       **TokenList;
 508    UINTN        TokenCount;
 509    LOADER_ENTRY *Entry;
 510    BOOLEAN      DefaultsSet = FALSE, AddedSubmenu = FALSE;
 511    REFIT_VOLUME *CurrentVolume = Volume;
 512
 513    // prepare the menu entry
 514    Entry = InitializeLoaderEntry(NULL);
 515    if (Entry == NULL)
 516       return NULL;
 517
 518    Entry->Title           = StrDuplicate(Title);
 519    Entry->me.Title        = PoolPrint(L"Boot %s from %s", (Title != NULL) ? Title : L"Unknown", CurrentVolume->VolName);
 520    Entry->me.Row          = 0;
 521    Entry->me.BadgeImage   = CurrentVolume->VolBadgeImage;
 522    Entry->VolName         = CurrentVolume->VolName;
 523
 524    // Parse the config file to add options for a single stanza, terminating when the token
 525    // is "}" or when the end of file is reached.
 526    while (((TokenCount = ReadTokenLine(File, &TokenList)) > 0) && (StriCmp(TokenList[0], L"}") != 0)) {
 527       if ((StriCmp(TokenList[0], L"loader") == 0) && (TokenCount > 1)) { // set the boot loader filename
 528          Entry->LoaderPath = StrDuplicate(TokenList[1]);
 529          Entry->DevicePath = FileDevicePath(CurrentVolume->DeviceHandle, Entry->LoaderPath);
 530          SetLoaderDefaults(Entry, TokenList[1], CurrentVolume);
 531          FreePool(Entry->LoadOptions);
 532          Entry->LoadOptions = NULL; // Discard default options, if any
 533          DefaultsSet = TRUE;
 534       } else if ((StriCmp(TokenList[0], L"volume") == 0) && (TokenCount > 1)) {
 535          if (FindVolume(&CurrentVolume, TokenList[1])) {
 536             FreePool(Entry->me.Title);
 537             Entry->me.Title        = PoolPrint(L"Boot %s from %s", (Title != NULL) ? Title : L"Unknown", CurrentVolume->VolName);
 538             Entry->me.BadgeImage   = CurrentVolume->VolBadgeImage;
 539             Entry->VolName         = CurrentVolume->VolName;
 540          } // if match found
 541       } else if ((StriCmp(TokenList[0], L"icon") == 0) && (TokenCount > 1)) {
 542          FreePool(Entry->me.Image);
 543          Entry->me.Image = LoadIcns(CurrentVolume->RootDir, TokenList[1], 128);
 544          if (Entry->me.Image == NULL) {
 545             Entry->me.Image = DummyImage(128);
 546          }
 547       } else if ((StriCmp(TokenList[0], L"initrd") == 0) && (TokenCount > 1)) {
 548          if (Entry->InitrdPath)
 549             FreePool(Entry->InitrdPath);
 550          Entry->InitrdPath = StrDuplicate(TokenList[1]);
 551       } else if ((StriCmp(TokenList[0], L"options") == 0) && (TokenCount > 1)) {
 552          if (Entry->LoadOptions)
 553             FreePool(Entry->LoadOptions);
 554          Entry->LoadOptions = StrDuplicate(TokenList[1]);
 555       } else if ((StriCmp(TokenList[0], L"ostype") == 0) && (TokenCount > 1)) {
 556          if (TokenCount > 1) {
 557             Entry->OSType = TokenList[1][0];
 558          }
 559       } else if ((StriCmp(TokenList[0], L"graphics") == 0) && (TokenCount > 1)) {
 560          Entry->UseGraphicsMode = (StriCmp(TokenList[1], L"on") == 0);
 561       } else if (StriCmp(TokenList[0], L"disabled") == 0) {
 562          Entry->Enabled = FALSE;
 563       } else if ((StriCmp(TokenList[0], L"submenuentry") == 0) && (TokenCount > 1)) {
 564          AddSubmenu(Entry, File, CurrentVolume, TokenList[1]);
 565          AddedSubmenu = TRUE;
 566       } // set options to pass to the loader program
 567       FreeTokenLine(&TokenList, &TokenCount);
 568    } // while()
 569
 570    if (AddedSubmenu)
 571        AddMenuEntry(Entry->me.SubScreen, &MenuEntryReturn);
 572
 573    if (Entry->InitrdPath) {
 574       MergeStrings(&Entry->LoadOptions, L"initrd=", L' ');
 575       MergeStrings(&Entry->LoadOptions, Entry->InitrdPath, 0);
 576       FreePool(Entry->InitrdPath);
 577       Entry->InitrdPath = NULL;
 578    } // if
 579
 580    if (!DefaultsSet)
 581       SetLoaderDefaults(Entry, L"\\EFI\\BOOT\\nemo.efi", CurrentVolume); // user included no entry; use bogus one
 582
 583    return(Entry);
 584 } // static VOID AddStanzaEntries()
 585
 586 // Read the user-configured loaders file, refind_loaders.conf, and add or delete
 587 // entries based on the contents of that file....
 588 VOID ScanUserConfigured(VOID)
 589 {
 590    EFI_STATUS        Status;
 591    REFIT_FILE        File;
 592    REFIT_VOLUME      *Volume;
 593    CHAR16            **TokenList;
 594    CHAR16            *Title = NULL;
 595    UINTN             TokenCount;
 596    LOADER_ENTRY      *Entry;
 597
 598    if (FileExists(SelfDir, CONFIG_FILE_NAME)) {
 599       Status = ReadFile(SelfDir, CONFIG_FILE_NAME, &File);
 600       if (EFI_ERROR(Status))
 601          return;
 602
 603       Volume = SelfVolume;
 604
 605       while ((TokenCount = ReadTokenLine(&File, &TokenList)) > 0) {
 606          if ((StriCmp(TokenList[0], L"menuentry") == 0) && (TokenCount > 1)) {
 607             Title = StrDuplicate(TokenList[1]);
 608             Entry = AddStanzaEntries(&File, Volume, TokenList[1]);
 609             if (Entry->Enabled) {
 610                if (Entry->me.SubScreen == NULL)
 611                   GenerateSubScreen(Entry, Volume);
 612                AddPreparedLoaderEntry(Entry);
 613             } else {
 614                FreePool(Entry);
 615             } // if/else
 616             FreePool(Title);
 617          } // if
 618          FreeTokenLine(&TokenList, &TokenCount);
 619       } // while()
 620    } // if()
 621 } // VOID ScanUserConfigured()
 622
 623 // Read a Linux kernel options file for a Linux boot loader into memory. The LoaderPath
 624 // and Volume variables identify the location of the options file, but not its name --
 625 // you pass this function the filename of the Linux kernel, initial RAM disk, or other
 626 // file in the target directory, and this function finds the file with a name in the
 627 // comma-delimited list of names specified by LINUX_OPTIONS_FILENAMES within that
 628 // directory and loads it. This function tries multiple files because I originally
 629 // used the filename linux.conf, but close on the heels of that decision, the Linux
 630 // kernel developers decided to use that name for a similar purpose, but with a
 631 // different file format. Thus, I'm migrating rEFInd to use the name refind_linux.conf,
 632 // but I want a migration period in which both names are used.
 633 //
 634 // The return value is a pointer to the REFIT_FILE handle for the file, or NULL if
 635 // it wasn't found.
 636 REFIT_FILE * ReadLinuxOptionsFile(IN CHAR16 *LoaderPath, IN REFIT_VOLUME *Volume) {
 637    CHAR16       *OptionsFilename, *FullFilename;
 638    BOOLEAN      GoOn = TRUE;
 639    UINTN        i = 0;
 640    REFIT_FILE   *File = NULL;
 641    EFI_STATUS   Status;
 642
 643    do {
 644       OptionsFilename = FindCommaDelimited(LINUX_OPTIONS_FILENAMES, i++);
 645       FullFilename = FindPath(LoaderPath);
 646       if ((OptionsFilename != NULL) && (FullFilename != NULL)) {
 647          MergeStrings(&FullFilename, OptionsFilename, '\\');
 648          if (FileExists(Volume->RootDir, FullFilename)) {
 649             File = AllocateZeroPool(sizeof(REFIT_FILE));
 650             Status = ReadFile(Volume->RootDir, FullFilename, File);
 651             GoOn = FALSE;
 652             if (CheckError(Status, L"while loading the Linux options file")) {
 653                if (File != NULL)
 654                   FreePool(File);
 655                File = NULL;
 656                GoOn = TRUE;
 657             } // if error
 658          } // if file exists
 659       } else { // a filename string is NULL
 660          GoOn = FALSE;
 661       } // if/else
 662       if (OptionsFilename != NULL)
 663          FreePool(OptionsFilename);
 664       if (FullFilename != NULL)
 665          FreePool(FullFilename);
 666       OptionsFilename = FullFilename = NULL;
 667    } while (GoOn);
 668    return (File);
 669 } // static REFIT_FILE * ReadLinuxOptionsFile()
 670
 671 // Retrieve a single line of options from a Linux kernel options file
 672 CHAR16 * GetFirstOptionsFromFile(IN CHAR16 *LoaderPath, IN REFIT_VOLUME *Volume) {
 673    UINTN        TokenCount;
 674    CHAR16       *Options = NULL;
 675    CHAR16       **TokenList;
 676    REFIT_FILE   *File;
 677
 678    File = ReadLinuxOptionsFile(LoaderPath, Volume);
 679    if (File != NULL) {
 680       TokenCount = ReadTokenLine(File, &TokenList);
 681       if (TokenCount > 1)
 682          Options = StrDuplicate(TokenList[1]);
 683       FreeTokenLine(&TokenList, &TokenCount);
 684       FreePool(File);
 685    }
 686    return Options;
 687 } // static CHAR16 * GetOptionsFile()
 688