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