summaryrefslogtreecommitdiff
path: root/ShellPkg/Library/UefiShellLevel2CommandsLib/Parse.c
blob: 4b1973a5050f6abdf42f04ae21e5ce92c60e11c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
/** @file
  Main file for Parse shell level 2 function.

  (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P.<BR>
  Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "UefiShellLevel2CommandsLib.h"

/**
  Check if data is coming from StdIn output.

  @param[in] None
 
  @retval TRUE  StdIn stream data available to parse 
  @retval FALSE StdIn stream data is not available to parse. 
**/
BOOLEAN
IsStdInDataAvailable (
  VOID
  )
{
  SHELL_FILE_HANDLE FileHandle;
  EFI_STATUS        Status;
  CHAR16            CharBuffer; 
  UINTN             CharSize;
  UINT64            OriginalFilePosition;

  Status               = EFI_SUCCESS; 
  FileHandle           = NULL;
  OriginalFilePosition = 0;

  if (ShellOpenFileByName (L">i", &FileHandle, EFI_FILE_MODE_READ, 0) == EFI_SUCCESS) {
    CharSize = sizeof(CHAR16);
    gEfiShellProtocol->GetFilePosition (FileHandle, &OriginalFilePosition);
    Status = gEfiShellProtocol->ReadFile (FileHandle, &CharSize, &CharBuffer);
    if (EFI_ERROR (Status) || (CharSize != sizeof(CHAR16))) {
      return FALSE;
    }
    gEfiShellProtocol->SetFilePosition(FileHandle, OriginalFilePosition);
  }

  if (FileHandle == NULL) {
    return FALSE;
  } else {
    return TRUE;
  }
}

/**
  Function to read a single line (up to but not including the \n) using StdIn data from a SHELL_FILE_HANDLE.

  If the position upon start is 0, then the Ascii Boolean will be set.  This should be
  maintained and not changed for all operations with the same file.

  @param[in]       Handle        SHELL_FILE_HANDLE to read from.
  @param[in, out]  Buffer        The pointer to buffer to read into.
  @param[in, out]  Size          The pointer to number of bytes in Buffer.
  @param[in]       Truncate      If the buffer is large enough, this has no effect.
                                 If the buffer is is too small and Truncate is TRUE,
                                 the line will be truncated.
                                 If the buffer is is too small and Truncate is FALSE,
                                 then no read will occur.

  @retval EFI_SUCCESS           The operation was successful.  The line is stored in
                                Buffer.
  @retval EFI_INVALID_PARAMETER Handle was NULL.
  @retval EFI_INVALID_PARAMETER Size was NULL.
  @retval EFI_BUFFER_TOO_SMALL  Size was not large enough to store the line.
                                Size was updated to the minimum space required.
**/
EFI_STATUS
ShellFileHandleReadStdInLine(
  IN SHELL_FILE_HANDLE          Handle,
  IN OUT CHAR16                 *Buffer,
  IN OUT UINTN                  *Size,
  IN BOOLEAN                    Truncate
  )
{
  EFI_STATUS  Status;
  CHAR16      CharBuffer;
  UINTN       CharSize;
  UINTN       CountSoFar;
  UINT64      OriginalFilePosition;


  if (Handle == NULL
    ||Size   == NULL
   ){
    return (EFI_INVALID_PARAMETER);
  }
  if (Buffer == NULL) {
    ASSERT(*Size == 0);
  } else {
    *Buffer = CHAR_NULL;
  }
  gEfiShellProtocol->GetFilePosition (Handle, &OriginalFilePosition);

  for (CountSoFar = 0;;CountSoFar++){
    CharBuffer = 0;
    CharSize = sizeof(CHAR16);
    Status = gEfiShellProtocol->ReadFile (Handle, &CharSize, &CharBuffer);
    if (  EFI_ERROR(Status)
       || CharSize == 0
       || (CharBuffer == L'\n')
     ){
      break;
    }
    //
    // if we have space save it...
    //
    if ((CountSoFar+1)*sizeof(CHAR16) < *Size){
      ASSERT(Buffer != NULL);
      ((CHAR16*)Buffer)[CountSoFar] = CharBuffer;
      ((CHAR16*)Buffer)[CountSoFar+1] = CHAR_NULL;
    }
  }

  //
  // if we ran out of space tell when...
  //
  if ((CountSoFar+1)*sizeof(CHAR16) > *Size){
    *Size = (CountSoFar+1)*sizeof(CHAR16);
    if (!Truncate) {
      gEfiShellProtocol->SetFilePosition(Handle, OriginalFilePosition);
    } else {
      DEBUG((DEBUG_WARN, "The line was truncated in ShellFileHandleReadLine"));
    }
    return (EFI_BUFFER_TOO_SMALL);
  }
  while(Buffer[StrLen(Buffer)-1] == L'\r') {
    Buffer[StrLen(Buffer)-1] = CHAR_NULL;
  }

  return (Status);
}


/**
  Function to read a single line using StdIn from a SHELL_FILE_HANDLE. The \n is not included in the returned
  buffer.  The returned buffer must be callee freed.

  If the position upon start is 0, then the Ascii Boolean will be set.  This should be
  maintained and not changed for all operations with the same file.

  @param[in]       Handle        SHELL_FILE_HANDLE to read from.

  @return                        The line of text from the file.
  @retval NULL                   There was not enough memory available.

  @sa ShellFileHandleReadLine
**/
CHAR16*
ParseReturnStdInLine (
  IN SHELL_FILE_HANDLE Handle
  )
{
  CHAR16          *RetVal;
  UINTN           Size;
  EFI_STATUS      Status;

  Size   = 0;
  RetVal = NULL;

  Status = ShellFileHandleReadStdInLine (Handle, RetVal, &Size, FALSE);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    RetVal = AllocateZeroPool(Size);
    if (RetVal == NULL) {
      return (NULL);
    }
    Status = ShellFileHandleReadStdInLine (Handle, RetVal, &Size, FALSE);

  }
  if (EFI_ERROR(Status) && (RetVal != NULL)) {
    FreePool(RetVal);
    RetVal = NULL;
  }
  return (RetVal);
}

/**
  Handle stings for SFO Output with escape character ^ in a string
  1. Quotation marks in the string must be escaped by using a ^ character (i.e. ^"). 
  2. The ^ character may be inserted using ^^.

  @param[in]  String  The Unicode NULL-terminated string.
 
  @retval NewString   The new string handled for SFO.
**/
EFI_STRING
HandleStringWithEscapeCharForParse (
  IN      CHAR16  *String
  )
{
  EFI_STRING  NewStr;
  EFI_STRING  StrWalker;
  EFI_STRING  ReturnStr;

  if (String == NULL) {
    return NULL;
  }
  
  //
  // start to parse the input string.
  //
  NewStr = AllocateZeroPool (StrSize (String));
  if (NewStr == NULL) {
    return NULL;
  }
  ReturnStr = NewStr;
  StrWalker = String;
  while (*StrWalker != CHAR_NULL) {
    if (*StrWalker == L'^' && (*(StrWalker + 1) == L'^' || *(StrWalker + 1) == L'"')) {
      *NewStr = *(StrWalker + 1);
      StrWalker++;
    } else {
      *NewStr = *StrWalker;
    }
    StrWalker++;
    NewStr++;
  }
  
  return ReturnStr;
}


/**
  Do the actual parsing of the file.  the file should be SFO output from a 
  shell command or a similar format.

  @param[in] FileName               The filename to open.
  @param[in] TableName              The name of the table to find.
  @param[in] ColumnIndex            The column number to get.
  @param[in] TableNameInstance      Which instance of the table to get (row).
  @param[in] ShellCommandInstance   Which instance of the command to get.
  @param[in] StreamingUnicode       Indicates Input file is StdIn Unicode streaming data or not

  @retval SHELL_NOT_FOUND     The requested instance was not found.
  @retval SHELL_SUCCESS       The operation was successful.
**/
SHELL_STATUS
PerformParsing(
  IN CONST CHAR16 *FileName,
  IN CONST CHAR16 *TableName,
  IN CONST UINTN  ColumnIndex,
  IN CONST UINTN  TableNameInstance,
  IN CONST UINTN  ShellCommandInstance,
  IN BOOLEAN      StreamingUnicode
  )
{
  SHELL_FILE_HANDLE FileHandle;
  EFI_STATUS        Status;
  BOOLEAN           Ascii;
  UINTN             LoopVariable;
  UINTN             ColumnLoop;
  CHAR16            *TempLine;
  CHAR16            *ColumnPointer;
  SHELL_STATUS      ShellStatus;
  CHAR16            *TempSpot;
  CHAR16            *SfoString;

  ASSERT(FileName   != NULL);
  ASSERT(TableName  != NULL);

  ShellStatus       = SHELL_SUCCESS;

  Status = ShellOpenFileByName(FileName, &FileHandle, EFI_FILE_MODE_READ, 0);
  if (EFI_ERROR(Status)) {
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_FILE_OPEN_FAIL), gShellLevel2HiiHandle, L"parse", FileName);  
    ShellStatus = SHELL_NOT_FOUND;
  } else if (!EFI_ERROR (FileHandleIsDirectory (FileHandle))) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_NOT_FILE), gShellLevel2HiiHandle, L"parse", FileName);  
    ShellStatus = SHELL_NOT_FOUND;
  } else {
    for (LoopVariable = 0 ; LoopVariable < ShellCommandInstance && !ShellFileHandleEof(FileHandle);) {
     if (StreamingUnicode) {
       TempLine = ParseReturnStdInLine (FileHandle);
     } else {
       TempLine = ShellFileHandleReturnLine (FileHandle, &Ascii); 
     }

      if ((TempLine == NULL) || (*TempLine == CHAR_NULL && StreamingUnicode)) {
         break;
      }

      //
      // Search for "ShellCommand," in the file to start the SFO table
      // for a given ShellCommand.  The UEFI Shell spec does not specify
      // a space after the comma.
      //
      if (StrStr (TempLine, L"ShellCommand,") == TempLine) {
        LoopVariable++;
      }
      SHELL_FREE_NON_NULL(TempLine);
    }
    if (LoopVariable == ShellCommandInstance) {
      LoopVariable = 0;
      while(1) {
        if (StreamingUnicode) {
          TempLine = ParseReturnStdInLine (FileHandle);
        } else {
          TempLine = ShellFileHandleReturnLine (FileHandle, &Ascii); 
        }
        if (TempLine == NULL
            || *TempLine == CHAR_NULL
            || StrStr (TempLine, L"ShellCommand,") == TempLine) {
          SHELL_FREE_NON_NULL(TempLine);
          break;
        }
        if (StrStr (TempLine, TableName) == TempLine) {
          LoopVariable++;
          if (LoopVariable == TableNameInstance
              || (TableNameInstance == (UINTN)-1)) {
            for (ColumnLoop = 1, ColumnPointer = TempLine; ColumnLoop < ColumnIndex && ColumnPointer != NULL && *ColumnPointer != CHAR_NULL; ColumnLoop++) {
              ColumnPointer = StrStr (ColumnPointer, L",\"");
              if (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL){
                ColumnPointer++;
              }
            }
            if (ColumnLoop == ColumnIndex) {
              if (ColumnPointer == NULL) {
                ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_NO_VALUE), gShellLevel2HiiHandle, L"parse", L"Column Index");  
                ShellStatus = SHELL_INVALID_PARAMETER;
              } else {
                TempSpot = StrStr (ColumnPointer, L",\"");
                if (TempSpot != NULL) {
                  *TempSpot = CHAR_NULL;
                }
                while (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL && ColumnPointer[0] == L' '){
                  ColumnPointer++;
                }
                if (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL && ColumnPointer[0] == L'\"'){
                  ColumnPointer++;
                }
                if (ColumnPointer != NULL && *ColumnPointer != CHAR_NULL && ColumnPointer[StrLen (ColumnPointer) - 1] == L'\"'){
                  ColumnPointer[StrLen (ColumnPointer) - 1] = CHAR_NULL;
                }
                SfoString = HandleStringWithEscapeCharForParse (ColumnPointer);
                if (SfoString != NULL) {
                  ShellPrintEx (-1, -1, L"%s\r\n", SfoString);
                  SHELL_FREE_NON_NULL (SfoString);
                }
              }
            }
          }
        }
        SHELL_FREE_NON_NULL(TempLine);
      }
    }
  }
  return (ShellStatus);
}

STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  {L"-i", TypeValue},
  {L"-s", TypeValue},
  {NULL, TypeMax}
  };

/**
  Function for 'parse' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
**/
SHELL_STATUS
EFIAPI
ShellCommandRunParse (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS          Status;
  LIST_ENTRY          *Package;
  CHAR16              *ProblemParam;
  CONST CHAR16        *FileName;
  CONST CHAR16        *TableName;
  CONST CHAR16        *ColumnString;
  SHELL_STATUS        ShellStatus;
  UINTN               ShellCommandInstance;
  UINTN               TableNameInstance;
  BOOLEAN             StreamingUnicode;

  ShellStatus      = SHELL_SUCCESS;
  ProblemParam     = NULL;
  StreamingUnicode = FALSE;

  //
  // initialize the shell lib (we must be in non-auto-init...)
  //
  Status = ShellInitialize();
  ASSERT_EFI_ERROR(Status);

  //
  // parse the command line
  //
  Status = ShellCommandLineParseEx (ParamList, &Package, &ProblemParam, TRUE, FALSE);
  if (EFI_ERROR(Status)) {
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel2HiiHandle, L"parse", ProblemParam);  
      FreePool(ProblemParam);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      ASSERT(FALSE);
    }
  } else {
    StreamingUnicode = IsStdInDataAvailable ();
    if ((!StreamingUnicode && (ShellCommandLineGetCount(Package) < 4)) ||
        (ShellCommandLineGetCount(Package) < 3)) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel2HiiHandle, L"parse");  
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else if ((StreamingUnicode && (ShellCommandLineGetCount(Package) > 3)) ||
                (ShellCommandLineGetCount(Package) > 4)) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellLevel2HiiHandle, L"parse");  
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      if (StreamingUnicode) {
        FileName         = L">i";
        TableName        = ShellCommandLineGetRawValue(Package, 1);
        ColumnString     = ShellCommandLineGetRawValue(Package, 2);
      } else {
        FileName         = ShellCommandLineGetRawValue(Package, 1);
        TableName        = ShellCommandLineGetRawValue(Package, 2);
        ColumnString     = ShellCommandLineGetRawValue(Package, 3);
      }
      if (ShellCommandLineGetValue(Package, L"-i") == NULL) {
        TableNameInstance = (UINTN)-1;
      } else {
        TableNameInstance = ShellStrToUintn(ShellCommandLineGetValue(Package, L"-i"));
      }
      if (ShellCommandLineGetValue(Package, L"-s") == NULL) {
        ShellCommandInstance = 1;
      } else {
        ShellCommandInstance = ShellStrToUintn(ShellCommandLineGetValue(Package, L"-s"));
      }

      ShellStatus = PerformParsing(FileName, TableName, ShellStrToUintn(ColumnString), TableNameInstance, ShellCommandInstance, StreamingUnicode);
    }
  }

  //
  // free the command line package
  //
  ShellCommandLineFreeVarList (Package);

  return (ShellStatus);
}