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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 |
ab94587a | 5 | This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php.\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | **/\r | |
ae591c14 DM |
13 | #include <Library/BaseMemoryLib.h>\r |
14 | #include <Library/BaseLib.h>\r | |
ab94587a | 15 | \r |
16 | /**\r | |
6a623094 HW |
17 | Removes the last directory or file entry in a path. For a path which is\r |
18 | like L"fs0:startup.nsh", it's converted to L"fs0:".\r | |
ab94587a | 19 | \r |
ae591c14 | 20 | @param[in,out] Path A pointer to the path to modify.\r |
ab94587a | 21 | \r |
22 | @retval FALSE Nothing was found to remove.\r | |
23 | @retval TRUE A directory or file was removed.\r | |
24 | **/\r | |
25 | BOOLEAN\r | |
26 | EFIAPI\r | |
27 | PathRemoveLastItem(\r | |
28 | IN OUT CHAR16 *Path\r | |
29 | )\r | |
30 | {\r | |
31 | CHAR16 *Walker;\r | |
32 | CHAR16 *LastSlash;\r | |
33 | //\r | |
34 | // get directory name from path... ('chop' off extra)\r | |
35 | //\r | |
36 | for ( Walker = Path, LastSlash = NULL\r | |
37 | ; Walker != NULL && *Walker != CHAR_NULL\r | |
38 | ; Walker++\r | |
39 | ){\r | |
6a623094 HW |
40 | if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) {\r |
41 | LastSlash = Walker+1;\r | |
42 | } else if (*Walker == L':' && *(Walker + 1) != L'\\' && *(Walker + 1) != CHAR_NULL) {\r | |
ab94587a | 43 | LastSlash = Walker+1;\r |
44 | }\r | |
45 | }\r | |
46 | if (LastSlash != NULL) {\r | |
47 | *LastSlash = CHAR_NULL;\r | |
48 | return (TRUE);\r | |
49 | }\r | |
50 | return (FALSE);\r | |
51 | }\r | |
52 | \r | |
53 | /**\r | |
ae591c14 DM |
54 | Function to clean up paths.\r |
55 | \r | |
ab94587a | 56 | - Single periods in the path are removed.\r |
57 | - Double periods in the path are removed along with a single parent directory.\r | |
58 | - Forward slashes L'/' are converted to backward slashes L'\'.\r | |
59 | \r | |
ae591c14 | 60 | This will be done inline and the existing buffer may be larger than required\r |
ab94587a | 61 | upon completion.\r |
62 | \r | |
63 | @param[in] Path The pointer to the string containing the path.\r | |
64 | \r | |
ae591c14 | 65 | @return Returns Path, otherwise returns NULL to indicate that an error has occured.\r |
ab94587a | 66 | **/\r |
67 | CHAR16*\r | |
68 | EFIAPI\r | |
69 | PathCleanUpDirectories(\r | |
70 | IN CHAR16 *Path\r | |
bb99e328 | 71 | )\r |
ab94587a | 72 | {\r |
73 | CHAR16 *TempString;\r | |
ae591c14 | 74 | \r |
bb99e328 RN |
75 | if (Path == NULL) {\r |
76 | return NULL;\r | |
ab94587a | 77 | }\r |
bb99e328 | 78 | \r |
ab94587a | 79 | //\r |
bb99e328 | 80 | // Replace the '/' with '\'\r |
ab94587a | 81 | //\r |
bb99e328 | 82 | for (TempString = Path; *TempString != CHAR_NULL; TempString++) {\r |
ab94587a | 83 | if (*TempString == L'/') {\r |
84 | *TempString = L'\\';\r | |
85 | }\r | |
86 | }\r | |
bb99e328 | 87 | \r |
ab94587a | 88 | //\r |
bb99e328 | 89 | // Remove all the "\.". E.g.: fs0:\abc\.\def\.\r |
ab94587a | 90 | //\r |
bb99e328 RN |
91 | while ((TempString = StrStr (Path, L"\\.\\")) != NULL) {\r |
92 | CopyMem (TempString, TempString + 2, StrSize (TempString + 2));\r | |
ab94587a | 93 | }\r |
9fdf3178 | 94 | if ((StrLen (Path) >= 2) && (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0)) {\r |
bb99e328 | 95 | Path[StrLen (Path) - 1] = CHAR_NULL;\r |
ab94587a | 96 | }\r |
bb99e328 | 97 | \r |
ab94587a | 98 | //\r |
bb99e328 | 99 | // Remove all the "\..". E.g.: fs0:\abc\..\def\..\r |
ab94587a | 100 | //\r |
bb99e328 RN |
101 | while (((TempString = StrStr(Path, L"\\..")) != NULL) &&\r |
102 | ((*(TempString + 3) == L'\\') || (*(TempString + 3) == CHAR_NULL))\r | |
103 | ) {\r | |
1fc3749d | 104 | *(TempString + 1) = CHAR_NULL;\r |
bb99e328 RN |
105 | PathRemoveLastItem(Path);\r |
106 | CopyMem (Path + StrLen (Path), TempString + 3, StrSize (TempString + 3));\r | |
ab94587a | 107 | }\r |
108 | \r | |
bb99e328 RN |
109 | //\r |
110 | // Replace the "\\" with "\"\r | |
111 | //\r | |
112 | while ((TempString = StrStr (Path, L"\\\\")) != NULL) {\r | |
113 | CopyMem (TempString, TempString + 1, StrSize (TempString + 1));\r | |
bbf904d1 | 114 | }\r |
ab94587a | 115 | \r |
bb99e328 | 116 | return Path;\r |
ab94587a | 117 | }\r |
118 | \r |