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1 | /** @file\r | |
2 | function declarations for shell environment functions.\r | |
3 | \r | |
4 | Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | **/\r | |
8 | \r | |
9 | #include "Shell.h"\r | |
10 | \r | |
11 | #define INIT_NAME_BUFFER_SIZE 128\r | |
12 | #define INIT_DATA_BUFFER_SIZE 1024\r | |
13 | \r | |
14 | //\r | |
15 | // The list is used to cache the environment variables.\r | |
16 | //\r | |
17 | ENV_VAR_LIST gShellEnvVarList;\r | |
18 | \r | |
19 | /**\r | |
20 | Reports whether an environment variable is Volatile or Non-Volatile.\r | |
21 | \r | |
22 | @param EnvVarName The name of the environment variable in question\r | |
23 | @param Volatile Return TRUE if the environment variable is volatile\r | |
24 | \r | |
25 | @retval EFI_SUCCESS The volatile attribute is returned successfully\r | |
26 | @retval others Some errors happened.\r | |
27 | **/\r | |
28 | EFI_STATUS\r | |
29 | IsVolatileEnv (\r | |
30 | IN CONST CHAR16 *EnvVarName,\r | |
31 | OUT BOOLEAN *Volatile\r | |
32 | )\r | |
33 | {\r | |
34 | EFI_STATUS Status;\r | |
35 | UINTN Size;\r | |
36 | VOID *Buffer;\r | |
37 | UINT32 Attribs;\r | |
38 | \r | |
39 | ASSERT (Volatile != NULL);\r | |
40 | \r | |
41 | Size = 0;\r | |
42 | Buffer = NULL;\r | |
43 | \r | |
44 | //\r | |
45 | // get the variable\r | |
46 | //\r | |
47 | Status = gRT->GetVariable (\r | |
48 | (CHAR16 *)EnvVarName,\r | |
49 | &gShellVariableGuid,\r | |
50 | &Attribs,\r | |
51 | &Size,\r | |
52 | Buffer\r | |
53 | );\r | |
54 | if (Status == EFI_BUFFER_TOO_SMALL) {\r | |
55 | Buffer = AllocateZeroPool (Size);\r | |
56 | if (Buffer == NULL) {\r | |
57 | return EFI_OUT_OF_RESOURCES;\r | |
58 | }\r | |
59 | \r | |
60 | Status = gRT->GetVariable (\r | |
61 | (CHAR16 *)EnvVarName,\r | |
62 | &gShellVariableGuid,\r | |
63 | &Attribs,\r | |
64 | &Size,\r | |
65 | Buffer\r | |
66 | );\r | |
67 | FreePool (Buffer);\r | |
68 | }\r | |
69 | \r | |
70 | //\r | |
71 | // not found means volatile\r | |
72 | //\r | |
73 | if (Status == EFI_NOT_FOUND) {\r | |
74 | *Volatile = TRUE;\r | |
75 | return EFI_SUCCESS;\r | |
76 | }\r | |
77 | \r | |
78 | if (EFI_ERROR (Status)) {\r | |
79 | return Status;\r | |
80 | }\r | |
81 | \r | |
82 | //\r | |
83 | // check for the Non Volatile bit\r | |
84 | //\r | |
85 | *Volatile = !(BOOLEAN)((Attribs & EFI_VARIABLE_NON_VOLATILE) == EFI_VARIABLE_NON_VOLATILE);\r | |
86 | return EFI_SUCCESS;\r | |
87 | }\r | |
88 | \r | |
89 | /**\r | |
90 | free function for ENV_VAR_LIST objects.\r | |
91 | \r | |
92 | @param[in] List The pointer to pointer to list.\r | |
93 | **/\r | |
94 | VOID\r | |
95 | FreeEnvironmentVariableList (\r | |
96 | IN LIST_ENTRY *List\r | |
97 | )\r | |
98 | {\r | |
99 | ENV_VAR_LIST *Node;\r | |
100 | \r | |
101 | ASSERT (List != NULL);\r | |
102 | if (List == NULL) {\r | |
103 | return;\r | |
104 | }\r | |
105 | \r | |
106 | for ( Node = (ENV_VAR_LIST *)GetFirstNode (List)\r | |
107 | ; !IsListEmpty (List)\r | |
108 | ; Node = (ENV_VAR_LIST *)GetFirstNode (List)\r | |
109 | )\r | |
110 | {\r | |
111 | ASSERT (Node != NULL);\r | |
112 | RemoveEntryList (&Node->Link);\r | |
113 | if (Node->Key != NULL) {\r | |
114 | FreePool (Node->Key);\r | |
115 | }\r | |
116 | \r | |
117 | if (Node->Val != NULL) {\r | |
118 | FreePool (Node->Val);\r | |
119 | }\r | |
120 | \r | |
121 | FreePool (Node);\r | |
122 | }\r | |
123 | }\r | |
124 | \r | |
125 | /**\r | |
126 | Creates a list of all Shell-Guid-based environment variables.\r | |
127 | \r | |
128 | @param[in, out] ListHead The pointer to pointer to LIST ENTRY object for\r | |
129 | storing this list.\r | |
130 | \r | |
131 | @retval EFI_SUCCESS the list was created successfully.\r | |
132 | **/\r | |
133 | EFI_STATUS\r | |
134 | GetEnvironmentVariableList (\r | |
135 | IN OUT LIST_ENTRY *ListHead\r | |
136 | )\r | |
137 | {\r | |
138 | CHAR16 *VariableName;\r | |
139 | UINTN NameSize;\r | |
140 | UINTN NameBufferSize;\r | |
141 | EFI_STATUS Status;\r | |
142 | EFI_GUID Guid;\r | |
143 | UINTN ValSize;\r | |
144 | UINTN ValBufferSize;\r | |
145 | ENV_VAR_LIST *VarList;\r | |
146 | \r | |
147 | if (ListHead == NULL) {\r | |
148 | return (EFI_INVALID_PARAMETER);\r | |
149 | }\r | |
150 | \r | |
151 | Status = EFI_SUCCESS;\r | |
152 | \r | |
153 | ValBufferSize = INIT_DATA_BUFFER_SIZE;\r | |
154 | NameBufferSize = INIT_NAME_BUFFER_SIZE;\r | |
155 | VariableName = AllocateZeroPool (NameBufferSize);\r | |
156 | if (VariableName == NULL) {\r | |
157 | return (EFI_OUT_OF_RESOURCES);\r | |
158 | }\r | |
159 | \r | |
160 | *VariableName = CHAR_NULL;\r | |
161 | \r | |
162 | while (!EFI_ERROR (Status)) {\r | |
163 | NameSize = NameBufferSize;\r | |
164 | Status = gRT->GetNextVariableName (&NameSize, VariableName, &Guid);\r | |
165 | if (Status == EFI_NOT_FOUND) {\r | |
166 | Status = EFI_SUCCESS;\r | |
167 | break;\r | |
168 | } else if (Status == EFI_BUFFER_TOO_SMALL) {\r | |
169 | NameBufferSize = NameSize > NameBufferSize * 2 ? NameSize : NameBufferSize * 2;\r | |
170 | SHELL_FREE_NON_NULL (VariableName);\r | |
171 | VariableName = AllocateZeroPool (NameBufferSize);\r | |
172 | if (VariableName == NULL) {\r | |
173 | Status = EFI_OUT_OF_RESOURCES;\r | |
174 | break;\r | |
175 | }\r | |
176 | \r | |
177 | NameSize = NameBufferSize;\r | |
178 | Status = gRT->GetNextVariableName (&NameSize, VariableName, &Guid);\r | |
179 | }\r | |
180 | \r | |
181 | if (!EFI_ERROR (Status) && CompareGuid (&Guid, &gShellVariableGuid)) {\r | |
182 | VarList = AllocateZeroPool (sizeof (ENV_VAR_LIST));\r | |
183 | if (VarList == NULL) {\r | |
184 | Status = EFI_OUT_OF_RESOURCES;\r | |
185 | } else {\r | |
186 | ValSize = ValBufferSize;\r | |
187 | //\r | |
188 | // We need another CHAR16 to save '\0' in VarList->Val.\r | |
189 | //\r | |
190 | VarList->Val = AllocateZeroPool (ValSize + sizeof (CHAR16));\r | |
191 | if (VarList->Val == NULL) {\r | |
192 | SHELL_FREE_NON_NULL (VarList);\r | |
193 | Status = EFI_OUT_OF_RESOURCES;\r | |
194 | break;\r | |
195 | }\r | |
196 | \r | |
197 | Status = SHELL_GET_ENVIRONMENT_VARIABLE_AND_ATTRIBUTES (VariableName, &VarList->Atts, &ValSize, VarList->Val);\r | |
198 | if (Status == EFI_BUFFER_TOO_SMALL) {\r | |
199 | ValBufferSize = ValSize > ValBufferSize * 2 ? ValSize : ValBufferSize * 2;\r | |
200 | SHELL_FREE_NON_NULL (VarList->Val);\r | |
201 | //\r | |
202 | // We need another CHAR16 to save '\0' in VarList->Val.\r | |
203 | //\r | |
204 | VarList->Val = AllocateZeroPool (ValBufferSize + sizeof (CHAR16));\r | |
205 | if (VarList->Val == NULL) {\r | |
206 | SHELL_FREE_NON_NULL (VarList);\r | |
207 | Status = EFI_OUT_OF_RESOURCES;\r | |
208 | break;\r | |
209 | }\r | |
210 | \r | |
211 | ValSize = ValBufferSize;\r | |
212 | Status = SHELL_GET_ENVIRONMENT_VARIABLE_AND_ATTRIBUTES (VariableName, &VarList->Atts, &ValSize, VarList->Val);\r | |
213 | }\r | |
214 | \r | |
215 | if (!EFI_ERROR (Status)) {\r | |
216 | VarList->Key = AllocateCopyPool (StrSize (VariableName), VariableName);\r | |
217 | if (VarList->Key == NULL) {\r | |
218 | SHELL_FREE_NON_NULL (VarList->Val);\r | |
219 | SHELL_FREE_NON_NULL (VarList);\r | |
220 | Status = EFI_OUT_OF_RESOURCES;\r | |
221 | } else {\r | |
222 | InsertTailList (ListHead, &VarList->Link);\r | |
223 | }\r | |
224 | } else {\r | |
225 | SHELL_FREE_NON_NULL (VarList->Val);\r | |
226 | SHELL_FREE_NON_NULL (VarList);\r | |
227 | }\r | |
228 | } // if (VarList == NULL) ... else ...\r | |
229 | } // compare guid\r | |
230 | } // while\r | |
231 | \r | |
232 | SHELL_FREE_NON_NULL (VariableName);\r | |
233 | \r | |
234 | if (EFI_ERROR (Status)) {\r | |
235 | FreeEnvironmentVariableList (ListHead);\r | |
236 | }\r | |
237 | \r | |
238 | return (Status);\r | |
239 | }\r | |
240 | \r | |
241 | /**\r | |
242 | Sets a list of all Shell-Guid-based environment variables. this will\r | |
243 | also eliminate all existing shell environment variables (even if they\r | |
244 | are not on the list).\r | |
245 | \r | |
246 | This function will also deallocate the memory from List.\r | |
247 | \r | |
248 | @param[in] ListHead The pointer to LIST_ENTRY from\r | |
249 | GetShellEnvVarList().\r | |
250 | \r | |
251 | @retval EFI_SUCCESS the list was Set successfully.\r | |
252 | **/\r | |
253 | EFI_STATUS\r | |
254 | SetEnvironmentVariableList (\r | |
255 | IN LIST_ENTRY *ListHead\r | |
256 | )\r | |
257 | {\r | |
258 | ENV_VAR_LIST VarList;\r | |
259 | ENV_VAR_LIST *Node;\r | |
260 | EFI_STATUS Status;\r | |
261 | UINTN Size;\r | |
262 | \r | |
263 | InitializeListHead (&VarList.Link);\r | |
264 | \r | |
265 | //\r | |
266 | // Delete all the current environment variables\r | |
267 | //\r | |
268 | Status = GetEnvironmentVariableList (&VarList.Link);\r | |
269 | ASSERT_EFI_ERROR (Status);\r | |
270 | \r | |
271 | for ( Node = (ENV_VAR_LIST *)GetFirstNode (&VarList.Link)\r | |
272 | ; !IsNull (&VarList.Link, &Node->Link)\r | |
273 | ; Node = (ENV_VAR_LIST *)GetNextNode (&VarList.Link, &Node->Link)\r | |
274 | )\r | |
275 | {\r | |
276 | if (Node->Key != NULL) {\r | |
277 | Status = SHELL_DELETE_ENVIRONMENT_VARIABLE (Node->Key);\r | |
278 | }\r | |
279 | \r | |
280 | ASSERT_EFI_ERROR (Status);\r | |
281 | }\r | |
282 | \r | |
283 | FreeEnvironmentVariableList (&VarList.Link);\r | |
284 | \r | |
285 | //\r | |
286 | // set all the variables from the list\r | |
287 | //\r | |
288 | for ( Node = (ENV_VAR_LIST *)GetFirstNode (ListHead)\r | |
289 | ; !IsNull (ListHead, &Node->Link)\r | |
290 | ; Node = (ENV_VAR_LIST *)GetNextNode (ListHead, &Node->Link)\r | |
291 | )\r | |
292 | {\r | |
293 | Size = StrSize (Node->Val) - sizeof (CHAR16);\r | |
294 | if (Node->Atts & EFI_VARIABLE_NON_VOLATILE) {\r | |
295 | Status = SHELL_SET_ENVIRONMENT_VARIABLE_NV (Node->Key, Size, Node->Val);\r | |
296 | } else {\r | |
297 | Status = SHELL_SET_ENVIRONMENT_VARIABLE_V (Node->Key, Size, Node->Val);\r | |
298 | }\r | |
299 | \r | |
300 | ASSERT_EFI_ERROR (Status);\r | |
301 | }\r | |
302 | \r | |
303 | FreeEnvironmentVariableList (ListHead);\r | |
304 | \r | |
305 | return (Status);\r | |
306 | }\r | |
307 | \r | |
308 | /**\r | |
309 | sets a list of all Shell-Guid-based environment variables.\r | |
310 | \r | |
311 | @param Environment Points to a NULL-terminated array of environment\r | |
312 | variables with the format 'x=y', where x is the\r | |
313 | environment variable name and y is the value.\r | |
314 | \r | |
315 | @retval EFI_SUCCESS The command executed successfully.\r | |
316 | @retval EFI_INVALID_PARAMETER The parameter is invalid.\r | |
317 | @retval EFI_OUT_OF_RESOURCES Out of resources.\r | |
318 | \r | |
319 | @sa SetEnvironmentVariableList\r | |
320 | **/\r | |
321 | EFI_STATUS\r | |
322 | SetEnvironmentVariables (\r | |
323 | IN CONST CHAR16 **Environment\r | |
324 | )\r | |
325 | {\r | |
326 | CONST CHAR16 *CurrentString;\r | |
327 | UINTN CurrentCount;\r | |
328 | ENV_VAR_LIST *VarList;\r | |
329 | ENV_VAR_LIST *Node;\r | |
330 | \r | |
331 | VarList = NULL;\r | |
332 | \r | |
333 | if (Environment == NULL) {\r | |
334 | return (EFI_INVALID_PARAMETER);\r | |
335 | }\r | |
336 | \r | |
337 | //\r | |
338 | // Build a list identical to the ones used for get/set list functions above\r | |
339 | //\r | |
340 | for ( CurrentCount = 0\r | |
341 | ;\r | |
342 | ; CurrentCount++\r | |
343 | )\r | |
344 | {\r | |
345 | CurrentString = Environment[CurrentCount];\r | |
346 | if (CurrentString == NULL) {\r | |
347 | break;\r | |
348 | }\r | |
349 | \r | |
350 | ASSERT (StrStr (CurrentString, L"=") != NULL);\r | |
351 | Node = AllocateZeroPool (sizeof (ENV_VAR_LIST));\r | |
352 | if (Node == NULL) {\r | |
353 | SetEnvironmentVariableList (&VarList->Link);\r | |
354 | return (EFI_OUT_OF_RESOURCES);\r | |
355 | }\r | |
356 | \r | |
357 | Node->Key = AllocateZeroPool ((StrStr (CurrentString, L"=") - CurrentString + 1) * sizeof (CHAR16));\r | |
358 | if (Node->Key == NULL) {\r | |
359 | SHELL_FREE_NON_NULL (Node);\r | |
360 | SetEnvironmentVariableList (&VarList->Link);\r | |
361 | return (EFI_OUT_OF_RESOURCES);\r | |
362 | }\r | |
363 | \r | |
364 | //\r | |
365 | // Copy the string into the Key, leaving the last character allocated as NULL to terminate\r | |
366 | //\r | |
367 | StrnCpyS (\r | |
368 | Node->Key,\r | |
369 | StrStr (CurrentString, L"=") - CurrentString + 1,\r | |
370 | CurrentString,\r | |
371 | StrStr (CurrentString, L"=") - CurrentString\r | |
372 | );\r | |
373 | \r | |
374 | //\r | |
375 | // ValueSize = TotalSize - already removed size - size for '=' + size for terminator (the last 2 items cancel each other)\r | |
376 | //\r | |
377 | Node->Val = AllocateCopyPool (StrSize (CurrentString) - StrSize (Node->Key), CurrentString + StrLen (Node->Key) + 1);\r | |
378 | if (Node->Val == NULL) {\r | |
379 | SHELL_FREE_NON_NULL (Node->Key);\r | |
380 | SHELL_FREE_NON_NULL (Node);\r | |
381 | SetEnvironmentVariableList (&VarList->Link);\r | |
382 | return (EFI_OUT_OF_RESOURCES);\r | |
383 | }\r | |
384 | \r | |
385 | Node->Atts = EFI_VARIABLE_BOOTSERVICE_ACCESS;\r | |
386 | \r | |
387 | if (VarList == NULL) {\r | |
388 | VarList = AllocateZeroPool (sizeof (ENV_VAR_LIST));\r | |
389 | if (VarList == NULL) {\r | |
390 | SHELL_FREE_NON_NULL (Node->Key);\r | |
391 | SHELL_FREE_NON_NULL (Node->Val);\r | |
392 | SHELL_FREE_NON_NULL (Node);\r | |
393 | return (EFI_OUT_OF_RESOURCES);\r | |
394 | }\r | |
395 | \r | |
396 | InitializeListHead (&VarList->Link);\r | |
397 | }\r | |
398 | \r | |
399 | InsertTailList (&VarList->Link, &Node->Link);\r | |
400 | } // for loop\r | |
401 | \r | |
402 | //\r | |
403 | // set this new list as the set of all environment variables.\r | |
404 | // this function also frees the memory and deletes all pre-existing\r | |
405 | // shell-guid based environment variables.\r | |
406 | //\r | |
407 | return (SetEnvironmentVariableList (&VarList->Link));\r | |
408 | }\r | |
409 | \r | |
410 | /**\r | |
411 | Find an environment variable in the gShellEnvVarList.\r | |
412 | \r | |
413 | @param Key The name of the environment variable.\r | |
414 | @param Value The value of the environment variable, the buffer\r | |
415 | shoule be freed by the caller.\r | |
416 | @param ValueSize The size in bytes of the environment variable\r | |
417 | including the tailing CHAR_NELL.\r | |
418 | @param Atts The attributes of the variable.\r | |
419 | \r | |
420 | @retval EFI_SUCCESS The command executed successfully.\r | |
421 | @retval EFI_NOT_FOUND The environment variable is not found in\r | |
422 | gShellEnvVarList.\r | |
423 | \r | |
424 | **/\r | |
425 | EFI_STATUS\r | |
426 | ShellFindEnvVarInList (\r | |
427 | IN CONST CHAR16 *Key,\r | |
428 | OUT CHAR16 **Value,\r | |
429 | OUT UINTN *ValueSize,\r | |
430 | OUT UINT32 *Atts OPTIONAL\r | |
431 | )\r | |
432 | {\r | |
433 | ENV_VAR_LIST *Node;\r | |
434 | \r | |
435 | if ((Key == NULL) || (Value == NULL) || (ValueSize == NULL)) {\r | |
436 | return SHELL_INVALID_PARAMETER;\r | |
437 | }\r | |
438 | \r | |
439 | for ( Node = (ENV_VAR_LIST *)GetFirstNode (&gShellEnvVarList.Link)\r | |
440 | ; !IsNull (&gShellEnvVarList.Link, &Node->Link)\r | |
441 | ; Node = (ENV_VAR_LIST *)GetNextNode (&gShellEnvVarList.Link, &Node->Link)\r | |
442 | )\r | |
443 | {\r | |
444 | if ((Node->Key != NULL) && (StrCmp (Key, Node->Key) == 0)) {\r | |
445 | *Value = AllocateCopyPool (StrSize (Node->Val), Node->Val);\r | |
446 | *ValueSize = StrSize (Node->Val);\r | |
447 | if (Atts != NULL) {\r | |
448 | *Atts = Node->Atts;\r | |
449 | }\r | |
450 | \r | |
451 | return EFI_SUCCESS;\r | |
452 | }\r | |
453 | }\r | |
454 | \r | |
455 | return EFI_NOT_FOUND;\r | |
456 | }\r | |
457 | \r | |
458 | /**\r | |
459 | Add an environment variable into gShellEnvVarList.\r | |
460 | \r | |
461 | @param Key The name of the environment variable.\r | |
462 | @param Value The value of environment variable.\r | |
463 | @param ValueSize The size in bytes of the environment variable\r | |
464 | including the tailing CHAR_NULL\r | |
465 | @param Atts The attributes of the variable.\r | |
466 | \r | |
467 | @retval EFI_SUCCESS The environment variable was added to list successfully.\r | |
468 | @retval others Some errors happened.\r | |
469 | \r | |
470 | **/\r | |
471 | EFI_STATUS\r | |
472 | ShellAddEnvVarToList (\r | |
473 | IN CONST CHAR16 *Key,\r | |
474 | IN CONST CHAR16 *Value,\r | |
475 | IN UINTN ValueSize,\r | |
476 | IN UINT32 Atts\r | |
477 | )\r | |
478 | {\r | |
479 | ENV_VAR_LIST *Node;\r | |
480 | CHAR16 *LocalKey;\r | |
481 | CHAR16 *LocalValue;\r | |
482 | \r | |
483 | if ((Key == NULL) || (Value == NULL) || (ValueSize == 0)) {\r | |
484 | return EFI_INVALID_PARAMETER;\r | |
485 | }\r | |
486 | \r | |
487 | LocalValue = AllocateCopyPool (ValueSize, Value);\r | |
488 | if (LocalValue == NULL) {\r | |
489 | return EFI_OUT_OF_RESOURCES;\r | |
490 | }\r | |
491 | \r | |
492 | //\r | |
493 | // Update the variable value if it exists in gShellEnvVarList.\r | |
494 | //\r | |
495 | for ( Node = (ENV_VAR_LIST *)GetFirstNode (&gShellEnvVarList.Link)\r | |
496 | ; !IsNull (&gShellEnvVarList.Link, &Node->Link)\r | |
497 | ; Node = (ENV_VAR_LIST *)GetNextNode (&gShellEnvVarList.Link, &Node->Link)\r | |
498 | )\r | |
499 | {\r | |
500 | if ((Node->Key != NULL) && (StrCmp (Key, Node->Key) == 0)) {\r | |
501 | Node->Atts = Atts;\r | |
502 | SHELL_FREE_NON_NULL (Node->Val);\r | |
503 | Node->Val = LocalValue;\r | |
504 | return EFI_SUCCESS;\r | |
505 | }\r | |
506 | }\r | |
507 | \r | |
508 | //\r | |
509 | // If the environment variable key doesn't exist in list just insert\r | |
510 | // a new node.\r | |
511 | //\r | |
512 | LocalKey = AllocateCopyPool (StrSize (Key), Key);\r | |
513 | if (LocalKey == NULL) {\r | |
514 | FreePool (LocalValue);\r | |
515 | return EFI_OUT_OF_RESOURCES;\r | |
516 | }\r | |
517 | \r | |
518 | Node = (ENV_VAR_LIST *)AllocateZeroPool (sizeof (ENV_VAR_LIST));\r | |
519 | if (Node == NULL) {\r | |
520 | FreePool (LocalKey);\r | |
521 | FreePool (LocalValue);\r | |
522 | return EFI_OUT_OF_RESOURCES;\r | |
523 | }\r | |
524 | \r | |
525 | Node->Key = LocalKey;\r | |
526 | Node->Val = LocalValue;\r | |
527 | Node->Atts = Atts;\r | |
528 | InsertTailList (&gShellEnvVarList.Link, &Node->Link);\r | |
529 | \r | |
530 | return EFI_SUCCESS;\r | |
531 | }\r | |
532 | \r | |
533 | /**\r | |
534 | Remove a specified environment variable in gShellEnvVarList.\r | |
535 | \r | |
536 | @param Key The name of the environment variable.\r | |
537 | \r | |
538 | @retval EFI_SUCCESS The command executed successfully.\r | |
539 | @retval EFI_NOT_FOUND The environment variable is not found in\r | |
540 | gShellEnvVarList.\r | |
541 | **/\r | |
542 | EFI_STATUS\r | |
543 | ShellRemvoeEnvVarFromList (\r | |
544 | IN CONST CHAR16 *Key\r | |
545 | )\r | |
546 | {\r | |
547 | ENV_VAR_LIST *Node;\r | |
548 | \r | |
549 | if (Key == NULL) {\r | |
550 | return EFI_INVALID_PARAMETER;\r | |
551 | }\r | |
552 | \r | |
553 | for ( Node = (ENV_VAR_LIST *)GetFirstNode (&gShellEnvVarList.Link)\r | |
554 | ; !IsNull (&gShellEnvVarList.Link, &Node->Link)\r | |
555 | ; Node = (ENV_VAR_LIST *)GetNextNode (&gShellEnvVarList.Link, &Node->Link)\r | |
556 | )\r | |
557 | {\r | |
558 | if ((Node->Key != NULL) && (StrCmp (Key, Node->Key) == 0)) {\r | |
559 | SHELL_FREE_NON_NULL (Node->Key);\r | |
560 | SHELL_FREE_NON_NULL (Node->Val);\r | |
561 | RemoveEntryList (&Node->Link);\r | |
562 | SHELL_FREE_NON_NULL (Node);\r | |
563 | return EFI_SUCCESS;\r | |
564 | }\r | |
565 | }\r | |
566 | \r | |
567 | return EFI_NOT_FOUND;\r | |
568 | }\r | |
569 | \r | |
570 | /**\r | |
571 | Initialize the gShellEnvVarList and cache all Shell-Guid-based environment\r | |
572 | variables.\r | |
573 | \r | |
574 | **/\r | |
575 | EFI_STATUS\r | |
576 | ShellInitEnvVarList (\r | |
577 | VOID\r | |
578 | )\r | |
579 | {\r | |
580 | EFI_STATUS Status;\r | |
581 | \r | |
582 | InitializeListHead (&gShellEnvVarList.Link);\r | |
583 | Status = GetEnvironmentVariableList (&gShellEnvVarList.Link);\r | |
584 | \r | |
585 | return Status;\r | |
586 | }\r | |
587 | \r | |
588 | /**\r | |
589 | Destructe the gShellEnvVarList.\r | |
590 | \r | |
591 | **/\r | |
592 | VOID\r | |
593 | ShellFreeEnvVarList (\r | |
594 | VOID\r | |
595 | )\r | |
596 | {\r | |
597 | FreeEnvironmentVariableList (&gShellEnvVarList.Link);\r | |
598 | InitializeListHead (&gShellEnvVarList.Link);\r | |
599 | \r | |
600 | return;\r | |
601 | }\r |