[mirror_edk2.git] / ShellPkg / Application / Shell / ShellManParser.c

/** @file\r
  Provides interface to shell MAN file parser.\r
\r
  Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>\r
  Copyright 2015 Dell Inc.\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "Shell.h"\r
\r
CHAR16 EFIAPI InternalShellCharToUpper (IN CHAR16  Char);\r
\r
/**\r
  Verifies that the filename has .MAN on the end.\r
\r
  allocates a new buffer and copies the name (appending .MAN if necessary)\r
\r
  ASSERT if ManFileName is NULL\r
\r
  @param[in] ManFileName            original filename\r
\r
  @return the new filename with .man as the extension.\r
**/\r
CHAR16 *\r
EFIAPI\r
GetManFileName(\r
  IN CONST CHAR16 *ManFileName\r
  )\r
{\r
  CHAR16 *Buffer;\r
  if (ManFileName == NULL) {\r
    return (NULL);\r
  }\r
  //\r
  // Fix the file name\r
  //\r
  if (StrnCmp(ManFileName+StrLen(ManFileName)-4, L".man", 4)==0) {\r
    Buffer = AllocateCopyPool(StrSize(ManFileName), ManFileName);\r
  } else {\r
    Buffer = AllocateZeroPool(StrSize(ManFileName) + 4*sizeof(CHAR16));\r
    if (Buffer != NULL) {\r
      StrnCpyS( Buffer, \r
                (StrSize(ManFileName) + 4*sizeof(CHAR16))/sizeof(CHAR16), \r
                ManFileName, \r
                StrLen(ManFileName)\r
                );\r
      StrnCatS( Buffer, \r
                (StrSize(ManFileName) + 4*sizeof(CHAR16))/sizeof(CHAR16),\r
                L".man", \r
                4\r
                );\r
    }\r
  }\r
  return (Buffer);\r
}\r
\r
/**\r
  Search the path environment variable for possible locations and test for\r
  which one contains a man file with the name specified.  If a valid file is found\r
  stop searching and return the (opened) SHELL_FILE_HANDLE for that file.\r
\r
  @param[in] FileName           Name of the file to find and open.\r
  @param[out] Handle            Pointer to the handle of the found file.  The\r
                                value of this is undefined for return values\r
                                except EFI_SUCCESS.\r
\r
  @retval EFI_SUCCESS           The file was found.  Handle is a valid SHELL_FILE_HANDLE\r
  @retval EFI_INVALID_PARAMETER A parameter had an invalid value.\r
  @retval EFI_NOT_FOUND         The file was not found.\r
**/\r
EFI_STATUS\r
EFIAPI\r
SearchPathForFile(\r
  IN CONST CHAR16             *FileName,\r
  OUT SHELL_FILE_HANDLE       *Handle\r
  )\r
{\r
  CHAR16          *FullFileName;\r
  EFI_STATUS      Status;\r
\r
  if ( FileName     == NULL\r
    || Handle       == NULL\r
    || StrLen(FileName) == 0\r
   ){\r
    return (EFI_INVALID_PARAMETER);\r
  }\r
\r
  FullFileName = ShellFindFilePath(FileName);\r
  if (FullFileName == NULL) {\r
    return (EFI_NOT_FOUND);\r
  }\r
\r
  //\r
  // now open that file\r
  //\r
  Status = EfiShellOpenFileByName(FullFileName, Handle, EFI_FILE_MODE_READ);\r
  FreePool(FullFileName);\r
\r
  return (Status);\r
}\r
\r
/**\r
  parses through Buffer (which is MAN file formatted) and returns the\r
  detailed help for any sub section specified in the comma seperated list of\r
  sections provided.  If the end of the file or a .TH section is found then\r
  return.\r
\r
  Upon a sucessful return the caller is responsible to free the memory in *HelpText\r
\r
  @param[in] Buffer             Buffer to read from\r
  @param[in] Sections           name of command's sub sections to find\r
  @param[in] HelpText           pointer to pointer to string where text goes.\r
  @param[in] HelpSize           pointer to size of allocated HelpText (may be updated)\r
\r
  @retval EFI_OUT_OF_RESOURCES  a memory allocation failed.\r
  @retval EFI_SUCCESS           the section was found and its description sotred in\r
                                an alloceted buffer.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ManBufferFindSections(\r
  IN CONST CHAR16 *Buffer,\r
  IN CONST CHAR16 *Sections,\r
  IN CHAR16       **HelpText,\r
  IN UINTN        *HelpSize\r
  )\r
{\r
  EFI_STATUS          Status;\r
  CONST CHAR16        *CurrentLocation;\r
  BOOLEAN             CurrentlyReading;\r
  CHAR16              *SectionName;\r
  UINTN               SectionLen;\r
  BOOLEAN             Found;\r
  CHAR16              *TempString;\r
  CHAR16              *TempString2;\r
\r
  if ( Buffer     == NULL\r
    || HelpText   == NULL\r
    || HelpSize   == NULL\r
   ){\r
    return (EFI_INVALID_PARAMETER);\r
  }\r
\r
  Status            = EFI_SUCCESS;\r
  CurrentlyReading  = FALSE;\r
  Found             = FALSE;\r
\r
  for (CurrentLocation = Buffer,TempString = NULL\r
    ;  CurrentLocation != NULL && *CurrentLocation != CHAR_NULL\r
    ;  CurrentLocation=StrStr(CurrentLocation, L"\r\n"),TempString = NULL\r
   ){\r
    while(CurrentLocation[0] == L'\r' || CurrentLocation[0] == L'\n') {\r
      CurrentLocation++;\r
    }\r
    if (CurrentLocation[0] == L'#') {\r
      //\r
      // Skip comment lines\r
      //\r
      continue;\r
    }\r
    if (StrnCmp(CurrentLocation, L".TH", 3) == 0) {\r
      //\r
      // we hit the end of this commands section so stop.\r
      //\r
      break;\r
    }\r
    if (StrnCmp(CurrentLocation, L".SH ", 4) == 0) {\r
      if (Sections == NULL) {\r
        CurrentlyReading = TRUE;\r
        continue;\r
      } else if (CurrentlyReading) {\r
        CurrentlyReading = FALSE;\r
      }\r
      CurrentLocation += 4;\r
      //\r
      // is this a section we want to read in?\r
      //\r
      if (StrLen(CurrentLocation)!=0) {\r
        TempString2 = StrStr(CurrentLocation, L" ");\r
        TempString2 = MIN(TempString2, StrStr(CurrentLocation, L"\r"));\r
        TempString2 = MIN(TempString2, StrStr(CurrentLocation, L"\n"));\r
        ASSERT(TempString == NULL);\r
        TempString = StrnCatGrow(&TempString, NULL, CurrentLocation, TempString2==NULL?0:TempString2 - CurrentLocation);\r
        if (TempString == NULL) {\r
          Status = EFI_OUT_OF_RESOURCES;\r
          break;\r
        }\r
        SectionName = TempString;\r
        SectionLen = StrLen(SectionName);\r
        SectionName = StrStr(Sections, SectionName);\r
        if (SectionName == NULL) {\r
          continue;\r
        }\r
        if (*(SectionName + SectionLen) == CHAR_NULL || *(SectionName + SectionLen) == L',') {\r
          CurrentlyReading = TRUE;\r
        }\r
      }\r
    } else if (CurrentlyReading) {\r
      Found = TRUE;\r
      if (StrLen(CurrentLocation)!=0) {\r
        TempString2 = StrStr(CurrentLocation, L"\r");\r
        TempString2 = MIN(TempString2, StrStr(CurrentLocation, L"\n"));\r
        ASSERT(TempString == NULL);\r
        TempString = StrnCatGrow(&TempString, NULL, CurrentLocation, TempString2==NULL?0:TempString2 - CurrentLocation);\r
        if (TempString == NULL) {\r
          Status = EFI_OUT_OF_RESOURCES;\r
          break;\r
        }\r
        //\r
        // copy and save the current line.\r
        //\r
        ASSERT((*HelpText == NULL && *HelpSize == 0) || (*HelpText != NULL));\r
        StrnCatGrow (HelpText, HelpSize, TempString, 0);\r
        if (HelpText == NULL) {\r
          Status = EFI_OUT_OF_RESOURCES;\r
          break;\r
        }\r
        StrnCatGrow (HelpText, HelpSize, L"\r\n", 0);\r
        if (HelpText == NULL) {\r
          Status = EFI_OUT_OF_RESOURCES;\r
          break;\r
        }\r
      }\r
    }\r
    SHELL_FREE_NON_NULL(TempString);\r
  }\r
  if (!Found && !EFI_ERROR(Status)) {\r
    return (EFI_NOT_FOUND);\r
  }\r
  return (Status);\r
}\r
\r
/**\r
  parses through the MAN file specified by SHELL_FILE_HANDLE and returns the\r
  detailed help for any sub section specified in the comma seperated list of\r
  sections provided.  If the end of the file or a .TH section is found then\r
  return.\r
\r
  Upon a sucessful return the caller is responsible to free the memory in *HelpText\r
\r
  @param[in] Handle             FileHandle to read from\r
  @param[in] Sections           name of command's sub sections to find\r
  @param[out] HelpText          pointer to pointer to string where text goes.\r
  @param[out] HelpSize          pointer to size of allocated HelpText (may be updated)\r
  @param[in] Ascii              TRUE if the file is ASCII, FALSE otherwise.\r
\r
  @retval EFI_OUT_OF_RESOURCES  a memory allocation failed.\r
  @retval EFI_SUCCESS           the section was found and its description sotred in\r
                                an alloceted buffer.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ManFileFindSections(\r
  IN SHELL_FILE_HANDLE  Handle,\r
  IN CONST CHAR16       *Sections,\r
  OUT CHAR16            **HelpText,\r
  OUT UINTN             *HelpSize,\r
  IN BOOLEAN            Ascii\r
  )\r
{\r
  EFI_STATUS          Status;\r
  CHAR16              *ReadLine;\r
  UINTN               Size;\r
  BOOLEAN             CurrentlyReading;\r
  CHAR16              *SectionName;\r
  UINTN               SectionLen;\r
  BOOLEAN             Found;\r
\r
  if ( Handle     == NULL\r
    || HelpText   == NULL\r
    || HelpSize   == NULL\r
   ){\r
    return (EFI_INVALID_PARAMETER);\r
  }\r
\r
  Status            = EFI_SUCCESS;\r
  CurrentlyReading  = FALSE;\r
  Size              = 1024;\r
  Found             = FALSE;\r
\r
  ReadLine          = AllocateZeroPool(Size);\r
  if (ReadLine == NULL) {\r
    return (EFI_OUT_OF_RESOURCES);\r
  }\r
\r
  for (;!ShellFileHandleEof(Handle);Size = 1024) {\r
    Status = ShellFileHandleReadLine(Handle, ReadLine, &Size, TRUE, &Ascii);\r
    if (ReadLine[0] == L'#') {\r
      //\r
      // Skip comment lines\r
      //\r
      continue;\r
    }\r
    //\r
    // ignore too small of buffer...\r
    //\r
    if (Status == EFI_BUFFER_TOO_SMALL) {\r
      Status = EFI_SUCCESS;\r
    }\r
    if (EFI_ERROR(Status)) {\r
      break;\r
    } else if (StrnCmp(ReadLine, L".TH", 3) == 0) {\r
      //\r
      // we hit the end of this commands section so stop.\r
      //\r
      break;\r
    } else if (StrnCmp(ReadLine, L".SH", 3) == 0) {\r
      if (Sections == NULL) {\r
        CurrentlyReading = TRUE;\r
        continue;\r
      }\r
      //\r
      // we found a section\r
      //\r
      if (CurrentlyReading) {\r
        CurrentlyReading = FALSE;\r
      }\r
      //\r
      // is this a section we want to read in?\r
      //\r
      for ( SectionName = ReadLine + 3\r
          ; *SectionName == L' '\r
          ; SectionName++);\r
      SectionLen = StrLen(SectionName);\r
      SectionName = StrStr(Sections, SectionName);\r
      if (SectionName == NULL) {\r
        continue;\r
      }\r
      if (*(SectionName + SectionLen) == CHAR_NULL || *(SectionName + SectionLen) == L',') {\r
        CurrentlyReading = TRUE;\r
      }\r
    } else if (CurrentlyReading) {\r
      Found = TRUE;\r
      //\r
      // copy and save the current line.\r
      //\r
      ASSERT((*HelpText == NULL && *HelpSize == 0) || (*HelpText != NULL));\r
      StrnCatGrow (HelpText, HelpSize, ReadLine, 0);\r
      StrnCatGrow (HelpText, HelpSize, L"\r\n", 0);\r
    }\r
  }\r
  FreePool(ReadLine);\r
  if (!Found && !EFI_ERROR(Status)) {\r
    return (EFI_NOT_FOUND);\r
  }\r
  return (Status);\r
}\r
\r
/**\r
  parses through the MAN file formatted Buffer and returns the\r
  "Brief Description" for the .TH section as specified by Command.  If the\r
  command section is not found return EFI_NOT_FOUND.\r
\r
  Upon a sucessful return the caller is responsible to free the memory in *BriefDesc\r
\r
  @param[in] Handle             Buffer to read from\r
  @param[in] Command            name of command's section to find\r
  @param[in] BriefDesc          pointer to pointer to string where description goes.\r
  @param[in] BriefSize          pointer to size of allocated BriefDesc\r
\r
  @retval EFI_OUT_OF_RESOURCES  a memory allocation failed.\r
  @retval EFI_SUCCESS           the section was found and its description sotred in\r
                                an alloceted buffer.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ManBufferFindTitleSection(\r
  IN CHAR16         **Buffer,\r
  IN CONST CHAR16   *Command,\r
  IN CHAR16         **BriefDesc,\r
  IN UINTN          *BriefSize\r
  )\r
{\r
  EFI_STATUS    Status;\r
  CHAR16        *TitleString;\r
  CHAR16        *TitleEnd;\r
  CHAR16        *CurrentLocation;\r
  UINTN         TitleLength;\r
  CONST CHAR16  StartString[] = L".TH ";\r
  CONST CHAR16  EndString[]   = L" 0 ";\r
\r
  if ( Buffer     == NULL\r
    || Command    == NULL\r
    || (BriefDesc != NULL && BriefSize == NULL)\r
   ){\r
    return (EFI_INVALID_PARAMETER);\r
  }\r
\r
  Status    = EFI_SUCCESS;\r
\r
  //\r
  // more characters for StartString and EndString\r
  //\r
  TitleLength = StrSize(Command) + (StrLen(StartString) + StrLen(EndString)) * sizeof(CHAR16);\r
  TitleString = AllocateZeroPool(TitleLength);\r
  if (TitleString == NULL) {\r
    return (EFI_OUT_OF_RESOURCES);\r
  }\r
  StrCpyS(TitleString, TitleLength/sizeof(CHAR16), StartString);\r
  StrCatS(TitleString, TitleLength/sizeof(CHAR16), Command);\r
  StrCatS(TitleString, TitleLength/sizeof(CHAR16), EndString);\r
\r
  CurrentLocation = StrStr(*Buffer, TitleString);\r
  if (CurrentLocation == NULL){\r
    Status = EFI_NOT_FOUND;\r
  } else {\r
    //\r
    // we found it so copy out the rest of the line into BriefDesc\r
    // After skipping any spaces or zeroes\r
    //\r
    for (CurrentLocation += StrLen(TitleString)\r
      ;  *CurrentLocation == L' ' || *CurrentLocation == L'0' || *CurrentLocation == L'1' || *CurrentLocation == L'\"'\r
      ;  CurrentLocation++);\r
\r
    TitleEnd = StrStr(CurrentLocation, L"\"");\r
    if (TitleEnd == NULL) {\r
      Status = EFI_DEVICE_ERROR;\r
    } else {\r
      if (BriefDesc != NULL) {\r
        *BriefSize = StrSize(TitleEnd);\r
        *BriefDesc = AllocateZeroPool(*BriefSize);\r
        if (*BriefDesc == NULL) {\r
          Status = EFI_OUT_OF_RESOURCES;\r
        } else {\r
          StrnCpyS(*BriefDesc, (*BriefSize)/sizeof(CHAR16), CurrentLocation, TitleEnd-CurrentLocation);\r
        }\r
      }\r
\r
      for (CurrentLocation = TitleEnd\r
        ;  *CurrentLocation != L'\n'\r
        ;  CurrentLocation++);\r
      for (\r
        ;  *CurrentLocation == L' ' || *CurrentLocation == L'\n' || *CurrentLocation == L'\r'\r
        ;  CurrentLocation++);\r
      *Buffer = CurrentLocation;\r
    }\r
  }\r
\r
  FreePool(TitleString);\r
  return (Status);\r
}\r
\r
/**\r
  Parses a line from a MAN file to see if it is the Title Header. If it is, then\r
  if the "Brief Description" is desired, allocate a buffer for it and return a\r
  copy. Upon a sucessful return the caller is responsible to free the memory in\r
  *BriefDesc\r
\r
  Uses a simple state machine that allows "unlimited" whitespace before and after the\r
  ".TH", compares Command and the MAN file commnd name without respect to case, and\r
  allows "unlimited" whitespace and '0' and '1' characters before the Short Description.\r
  The PCRE regex describing this functionality is: ^\s*\.TH\s+(\S)\s[\s01]*(.*)$\r
  where group 1 is the Command Name and group 2 is the Short Description.\r
\r
  @param[in] Command             name of command whose MAN file we think Line came from\r
  @param[in] Line                Pointer to a line from the MAN file\r
  @param[out] BriefDesc          pointer to pointer to string where description goes.\r
  @param[out] BriefSize          pointer to size of allocated BriefDesc\r
  @param[out] Found              TRUE if the Title Header was found and it belongs to Command\r
\r
  @retval TRUE   Line contained the Title Header\r
  @retval FALSE  Line did not contain the Title Header\r
**/\r
BOOLEAN\r
IsTitleHeader(\r
  IN CONST CHAR16       *Command,\r
  IN CHAR16             *Line,\r
  OUT CHAR16            **BriefDesc OPTIONAL,\r
  OUT UINTN             *BriefSize OPTIONAL,\r
  OUT BOOLEAN           *Found\r
  )\r
{\r
  // The states of a simple state machine used to recognize a title header line\r
  // and to extract the Short Description, if desired.\r
  typedef enum {\r
    LookForThMacro, LookForCommandName, CompareCommands, GetBriefDescription, Final\r
  } STATEVALUES;\r
\r
  STATEVALUES  State;\r
  UINTN        CommandIndex; // Indexes Command as we compare its chars to the MAN file.\r
  BOOLEAN      ReturnValue;  // TRUE if this the Title Header line of *some* MAN file.\r
  BOOLEAN      ReturnFound;  // TRUE if this the Title Header line of *the desired* MAN file.\r
\r
  ReturnValue = FALSE;\r
  ReturnFound = FALSE;\r
  CommandIndex = 0;\r
  State = LookForThMacro;\r
\r
  do {\r
\r
    if (*Line == L'\0') {\r
      break;\r
    }\r
\r
    switch (State) {\r
\r
      // Handle "^\s*.TH\s"\r
      // Go to state LookForCommandName if the title header macro is present; otherwise,\r
      // eat white space. If we see something other than white space, this is not a\r
      // title header line.\r
      case LookForThMacro:\r
        if (StrnCmp (L".TH ", Line, 4) == 0 || StrnCmp (L".TH\t", Line, 4) == 0) {\r
          Line += 4;\r
          State = LookForCommandName;\r
        }\r
        else if (*Line == L' ' || *Line == L'\t') {\r
          Line++;\r
        }\r
        else {\r
          State = Final;\r
        }\r
      break;\r
\r
      // Handle "\s*"\r
      // Eat any "extra" whitespace after the title header macro (we have already seen\r
      // at least one white space character). Go to state CompareCommands when a\r
      // non-white space is seen.\r
      case LookForCommandName:\r
        if (*Line == L' ' || *Line == L'\t') {\r
          Line++;\r
        }\r
        else {\r
          ReturnValue = TRUE;  // This is *some* command's title header line.\r
          State = CompareCommands;\r
          // Do not increment Line; it points to the first character of the command\r
          // name on the title header line.\r
        }\r
      break;\r
\r
      // Handle "(\S)\s"\r
      // Compare Command to the title header command name, ignoring case. When we\r
      // reach the end of the command (i.e. we see white space), the next state\r
      // depends on whether the caller wants a copy of the Brief Description.\r
      case CompareCommands:\r
        if (*Line == L' ' || *Line == L'\t') {\r
          ReturnFound = TRUE;  // This is the desired command's title header line.\r
          State = (BriefDesc == NULL) ? Final : GetBriefDescription;\r
        }\r
        else if (InternalShellCharToUpper (*Line) != InternalShellCharToUpper (*(Command + CommandIndex++))) {\r
          State = Final;\r
        }\r
        Line++;\r
      break;\r
\r
      // Handle "[\s01]*(.*)$"\r
      // Skip whitespace, '0', and '1' characters, if any, prior to the brief description.\r
      // Return the description to the caller.\r
      case GetBriefDescription:\r
        if (*Line != L' ' && *Line != L'\t' && *Line != L'0' && *Line != L'1') {\r
          *BriefSize = StrSize(Line);\r
          *BriefDesc = AllocateZeroPool(*BriefSize);\r
          if (*BriefDesc != NULL) {\r
            StrCpyS(*BriefDesc, (*BriefSize)/sizeof(CHAR16), Line);\r
          }\r
          State = Final;\r
        }\r
        Line++;\r
      break;\r
\r
    }\r
\r
  } while (State < Final);\r
\r
  *Found = ReturnFound;\r
  return ReturnValue;\r
}\r
\r
/**\r
  parses through the MAN file specified by SHELL_FILE_HANDLE and returns the\r
  "Brief Description" for the .TH section as specified by Command.  If the\r
  command section is not found return EFI_NOT_FOUND.\r
\r
  Upon a sucessful return the caller is responsible to free the memory in *BriefDesc\r
\r
  @param[in] Handle              FileHandle to read from\r
  @param[in] Command             name of command's section to find as entered on the\r
                                 command line (may be a relative or absolute path or\r
                                 be in any case: upper, lower, or mixed in numerous ways!).\r
  @param[out] BriefDesc          pointer to pointer to string where description goes.\r
  @param[out] BriefSize          pointer to size of allocated BriefDesc\r
  @param[in, out] Ascii          TRUE if the file is ASCII, FALSE otherwise, will be\r
                                 set if the file handle is at the 0 position.\r
\r
  @retval EFI_OUT_OF_RESOURCES  a memory allocation failed.\r
  @retval EFI_SUCCESS           the section was found and its description stored in\r
                                an allocated buffer if requested.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ManFileFindTitleSection(\r
  IN SHELL_FILE_HANDLE  Handle,\r
  IN CONST CHAR16       *Command,\r
  OUT CHAR16            **BriefDesc OPTIONAL,\r
  OUT UINTN             *BriefSize OPTIONAL,\r
  IN OUT BOOLEAN        *Ascii\r
  )\r
{\r
  EFI_STATUS  Status;\r
  CHAR16      *ReadLine;\r
  UINTN       Size;\r
  BOOLEAN     Found;\r
  UINTN       Start;\r
\r
  if ( Handle     == NULL\r
    || Command    == NULL\r
    || (BriefDesc != NULL && BriefSize == NULL)\r
   ){\r
    return (EFI_INVALID_PARAMETER);\r
  }\r
\r
  Status    = EFI_SUCCESS;\r
  Size      = 1024;\r
  Found     = FALSE;\r
\r
  ReadLine  = AllocateZeroPool(Size);\r
  if (ReadLine == NULL) {\r
    return (EFI_OUT_OF_RESOURCES);\r
  }\r
\r
  //\r
  // Do not pass any leading path information that may be present to IsTitleHeader().\r
  //\r
  Start = StrLen(Command);\r
  while (Start\r
         && (*(Command + Start - 1) != L'\\')\r
         && (*(Command + Start - 1) != L'/')\r
         && (*(Command + Start - 1) != L':')) {\r
    --Start;\r
  }\r
\r
  for (;!ShellFileHandleEof(Handle);Size = 1024) {\r
   Status = ShellFileHandleReadLine(Handle, ReadLine, &Size, TRUE, Ascii);\r
    //\r
    // ignore too small of buffer...\r
    //\r
    if (EFI_ERROR(Status) && Status != EFI_BUFFER_TOO_SMALL) {\r
      break;\r
    }\r
\r
    Status = EFI_NOT_FOUND;\r
    if (IsTitleHeader (Command+Start, ReadLine, BriefDesc, BriefSize, &Found)) {\r
      Status = Found ? EFI_SUCCESS : EFI_NOT_FOUND;\r
      break;\r
    }\r
  }\r
\r
  FreePool(ReadLine);\r
  return (Status);\r
}\r
\r
/**\r
  This function returns the help information for the specified command. The help text\r
  will be parsed from a UEFI Shell manual page. (see UEFI Shell 2.0 Appendix B)\r
\r
  If Sections is specified, then each section name listed will be compared in a casesensitive\r
  manner, to the section names described in Appendix B. If the section exists,\r
  it will be appended to the returned help text. If the section does not exist, no\r
  information will be returned. If Sections is NULL, then all help text information\r
  available will be returned.\r
\r
  if BriefDesc is NULL, then the breif description will not be savedd seperatly,\r
  but placed first in the main HelpText.\r
\r
  @param[in] ManFileName        Points to the NULL-terminated UEFI Shell MAN file name.\r
  @param[in] Command            Points to the NULL-terminated UEFI Shell command name.\r
  @param[in] Sections           Points to the NULL-terminated comma-delimited\r
                                section names to return. If NULL, then all\r
                                sections will be returned.\r
  @param[out] BriefDesc         On return, points to a callee-allocated buffer\r
                                containing brief description text.\r
  @param[out] HelpText          On return, points to a callee-allocated buffer\r
                                containing all specified help text.\r
\r
  @retval EFI_SUCCESS           The help text was returned.\r
  @retval EFI_OUT_OF_RESOURCES  The necessary buffer could not be allocated to hold the\r
                                returned help text.\r
  @retval EFI_INVALID_PARAMETER HelpText is NULL.\r
  @retval EFI_INVALID_PARAMETER ManFileName is invalid.\r
  @retval EFI_NOT_FOUND         There is no help text available for Command.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ProcessManFile(\r
  IN CONST CHAR16 *ManFileName,\r
  IN CONST CHAR16 *Command,\r
  IN CONST CHAR16 *Sections OPTIONAL,\r
  OUT CHAR16      **BriefDesc OPTIONAL,\r
  OUT CHAR16      **HelpText\r
  )\r
{\r
  CHAR16            *TempString;\r
  SHELL_FILE_HANDLE FileHandle;\r
  EFI_STATUS        Status;\r
  UINTN             HelpSize;\r
  UINTN             BriefSize;\r
  BOOLEAN           Ascii;\r
  CHAR16            *TempString2;\r
  EFI_DEVICE_PATH_PROTOCOL  *FileDevPath;\r
  EFI_DEVICE_PATH_PROTOCOL  *DevPath;\r
\r
  if ( ManFileName == NULL\r
    || Command     == NULL\r
    || HelpText    == NULL\r
   ){\r
    return (EFI_INVALID_PARAMETER);\r
  }\r
\r
  HelpSize    = 0;\r
  BriefSize   = 0;\r
  TempString  = NULL;\r
  Ascii       = FALSE;\r
  //\r
  // See if it's in HII first\r
  //\r
  TempString = ShellCommandGetCommandHelp(Command);\r
  if (TempString != NULL) {\r
    TempString2 = TempString;\r
    Status = ManBufferFindTitleSection(&TempString2, Command, BriefDesc, &BriefSize);\r
    if (!EFI_ERROR(Status) && HelpText != NULL){\r
      Status = ManBufferFindSections(TempString2, Sections, HelpText, &HelpSize);\r
    }\r
  } else {\r
    FileHandle    = NULL;\r
    TempString  = GetManFileName(ManFileName);\r
    if (TempString == NULL) {\r
      return (EFI_INVALID_PARAMETER);\r
    }\r
\r
    Status = SearchPathForFile(TempString, &FileHandle);\r
    if (EFI_ERROR(Status)) {\r
      FileDevPath = FileDevicePath(NULL, TempString);\r
      DevPath = AppendDevicePath (ShellInfoObject.ImageDevPath, FileDevPath);\r
      Status = InternalOpenFileDevicePath(DevPath, &FileHandle, EFI_FILE_MODE_READ, 0);\r
      FreePool(FileDevPath);\r
      FreePool(DevPath);\r
    }\r
\r
    if (!EFI_ERROR(Status)) {\r
      HelpSize  = 0;\r
      BriefSize = 0;\r
      Status = ManFileFindTitleSection(FileHandle, Command, BriefDesc, &BriefSize, &Ascii);\r
      if (!EFI_ERROR(Status) && HelpText != NULL){\r
        Status = ManFileFindSections(FileHandle, Sections, HelpText, &HelpSize, Ascii);\r
      }\r
      ShellInfoObject.NewEfiShellProtocol->CloseFile(FileHandle);\r
    } else {\r
      *HelpText = NULL;\r
    }\r
  }\r
  if (TempString != NULL) {\r
    FreePool(TempString);\r
  }\r
\r
  return (Status);\r
}\r