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ab94587a | 1 | /** @file\r |
ae591c14 | 2 | Defines file-path manipulation functions.\r |
ab94587a | 3 | \r |
9fdf3178 | 4 | Copyright (c) 2011 - 2017, Intel Corporation. All rights reserved.<BR>\r |
7177be0b | 5 | Copyright (c) 2018, Dell Technologies. All rights reserved.<BR>\r |
ab94587a | 6 | This program and the accompanying materials\r |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php.\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | **/\r | |
ae591c14 DM |
14 | #include <Library/BaseMemoryLib.h>\r |
15 | #include <Library/BaseLib.h>\r | |
ab94587a | 16 | \r |
17 | /**\r | |
6a623094 HW |
18 | Removes the last directory or file entry in a path. For a path which is\r |
19 | like L"fs0:startup.nsh", it's converted to L"fs0:".\r | |
ab94587a | 20 | \r |
ae591c14 | 21 | @param[in,out] Path A pointer to the path to modify.\r |
ab94587a | 22 | \r |
23 | @retval FALSE Nothing was found to remove.\r | |
24 | @retval TRUE A directory or file was removed.\r | |
25 | **/\r | |
26 | BOOLEAN\r | |
27 | EFIAPI\r | |
28 | PathRemoveLastItem(\r | |
29 | IN OUT CHAR16 *Path\r | |
30 | )\r | |
31 | {\r | |
32 | CHAR16 *Walker;\r | |
33 | CHAR16 *LastSlash;\r | |
34 | //\r | |
35 | // get directory name from path... ('chop' off extra)\r | |
36 | //\r | |
37 | for ( Walker = Path, LastSlash = NULL\r | |
38 | ; Walker != NULL && *Walker != CHAR_NULL\r | |
39 | ; Walker++\r | |
40 | ){\r | |
6a623094 HW |
41 | if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) {\r |
42 | LastSlash = Walker+1;\r | |
43 | } else if (*Walker == L':' && *(Walker + 1) != L'\\' && *(Walker + 1) != CHAR_NULL) {\r | |
ab94587a | 44 | LastSlash = Walker+1;\r |
45 | }\r | |
46 | }\r | |
47 | if (LastSlash != NULL) {\r | |
48 | *LastSlash = CHAR_NULL;\r | |
49 | return (TRUE);\r | |
50 | }\r | |
51 | return (FALSE);\r | |
52 | }\r | |
53 | \r | |
54 | /**\r | |
ae591c14 DM |
55 | Function to clean up paths.\r |
56 | \r | |
ab94587a | 57 | - Single periods in the path are removed.\r |
58 | - Double periods in the path are removed along with a single parent directory.\r | |
59 | - Forward slashes L'/' are converted to backward slashes L'\'.\r | |
60 | \r | |
ae591c14 | 61 | This will be done inline and the existing buffer may be larger than required\r |
ab94587a | 62 | upon completion.\r |
63 | \r | |
64 | @param[in] Path The pointer to the string containing the path.\r | |
65 | \r | |
ae591c14 | 66 | @return Returns Path, otherwise returns NULL to indicate that an error has occured.\r |
ab94587a | 67 | **/\r |
68 | CHAR16*\r | |
69 | EFIAPI\r | |
70 | PathCleanUpDirectories(\r | |
71 | IN CHAR16 *Path\r | |
bb99e328 | 72 | )\r |
ab94587a | 73 | {\r |
74 | CHAR16 *TempString;\r | |
ae591c14 | 75 | \r |
bb99e328 RN |
76 | if (Path == NULL) {\r |
77 | return NULL;\r | |
ab94587a | 78 | }\r |
bb99e328 | 79 | \r |
ab94587a | 80 | //\r |
bb99e328 | 81 | // Replace the '/' with '\'\r |
ab94587a | 82 | //\r |
bb99e328 | 83 | for (TempString = Path; *TempString != CHAR_NULL; TempString++) {\r |
ab94587a | 84 | if (*TempString == L'/') {\r |
85 | *TempString = L'\\';\r | |
86 | }\r | |
87 | }\r | |
bb99e328 | 88 | \r |
b08b045c JD |
89 | //\r |
90 | // Replace the "\\" with "\"\r | |
91 | //\r | |
92 | while ((TempString = StrStr (Path, L"\\\\")) != NULL) {\r | |
93 | CopyMem (TempString, TempString + 1, StrSize (TempString + 1));\r | |
94 | }\r | |
95 | \r | |
ab94587a | 96 | //\r |
bb99e328 | 97 | // Remove all the "\.". E.g.: fs0:\abc\.\def\.\r |
ab94587a | 98 | //\r |
bb99e328 RN |
99 | while ((TempString = StrStr (Path, L"\\.\\")) != NULL) {\r |
100 | CopyMem (TempString, TempString + 2, StrSize (TempString + 2));\r | |
ab94587a | 101 | }\r |
9fdf3178 | 102 | if ((StrLen (Path) >= 2) && (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0)) {\r |
bb99e328 | 103 | Path[StrLen (Path) - 1] = CHAR_NULL;\r |
ab94587a | 104 | }\r |
bb99e328 | 105 | \r |
ab94587a | 106 | //\r |
bb99e328 | 107 | // Remove all the "\..". E.g.: fs0:\abc\..\def\..\r |
ab94587a | 108 | //\r |
bb99e328 RN |
109 | while (((TempString = StrStr(Path, L"\\..")) != NULL) &&\r |
110 | ((*(TempString + 3) == L'\\') || (*(TempString + 3) == CHAR_NULL))\r | |
111 | ) {\r | |
1fc3749d | 112 | *(TempString + 1) = CHAR_NULL;\r |
bb99e328 | 113 | PathRemoveLastItem(Path);\r |
7177be0b JD |
114 | if (*(TempString + 3) != CHAR_NULL) {\r |
115 | CopyMem (Path + StrLen (Path), TempString + 4, StrSize (TempString + 4));\r | |
116 | }\r | |
ab94587a | 117 | }\r |
118 | \r | |
bb99e328 | 119 | return Path;\r |
ab94587a | 120 | }\r |
121 | \r |