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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 |
9344f092 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
ab94587a | 7 | **/\r |
ae591c14 DM |
8 | #include <Library/BaseMemoryLib.h>\r |
9 | #include <Library/BaseLib.h>\r | |
ab94587a | 10 | \r |
11 | /**\r | |
6a623094 HW |
12 | Removes the last directory or file entry in a path. For a path which is\r |
13 | like L"fs0:startup.nsh", it's converted to L"fs0:".\r | |
ab94587a | 14 | \r |
ae591c14 | 15 | @param[in,out] Path A pointer to the path to modify.\r |
ab94587a | 16 | \r |
17 | @retval FALSE Nothing was found to remove.\r | |
18 | @retval TRUE A directory or file was removed.\r | |
19 | **/\r | |
20 | BOOLEAN\r | |
21 | EFIAPI\r | |
2f88bd3a MK |
22 | PathRemoveLastItem (\r |
23 | IN OUT CHAR16 *Path\r | |
ab94587a | 24 | )\r |
25 | {\r | |
2f88bd3a MK |
26 | CHAR16 *Walker;\r |
27 | CHAR16 *LastSlash;\r | |
28 | \r | |
ab94587a | 29 | //\r |
30 | // get directory name from path... ('chop' off extra)\r | |
31 | //\r | |
32 | for ( Walker = Path, LastSlash = NULL\r | |
2f88bd3a MK |
33 | ; Walker != NULL && *Walker != CHAR_NULL\r |
34 | ; Walker++\r | |
35 | )\r | |
36 | {\r | |
37 | if ((*Walker == L'\\') && (*(Walker + 1) != CHAR_NULL)) {\r | |
6a623094 | 38 | LastSlash = Walker+1;\r |
2f88bd3a | 39 | } else if ((*Walker == L':') && (*(Walker + 1) != L'\\') && (*(Walker + 1) != CHAR_NULL)) {\r |
ab94587a | 40 | LastSlash = Walker+1;\r |
41 | }\r | |
42 | }\r | |
2f88bd3a | 43 | \r |
ab94587a | 44 | if (LastSlash != NULL) {\r |
45 | *LastSlash = CHAR_NULL;\r | |
46 | return (TRUE);\r | |
47 | }\r | |
2f88bd3a | 48 | \r |
ab94587a | 49 | return (FALSE);\r |
50 | }\r | |
51 | \r | |
52 | /**\r | |
ae591c14 DM |
53 | Function to clean up paths.\r |
54 | \r | |
ab94587a | 55 | - Single periods in the path are removed.\r |
56 | - Double periods in the path are removed along with a single parent directory.\r | |
57 | - Forward slashes L'/' are converted to backward slashes L'\'.\r | |
58 | \r | |
ae591c14 | 59 | This will be done inline and the existing buffer may be larger than required\r |
ab94587a | 60 | upon completion.\r |
61 | \r | |
62 | @param[in] Path The pointer to the string containing the path.\r | |
63 | \r | |
1371e15f | 64 | @return Returns Path, otherwise returns NULL to indicate that an error has occurred.\r |
ab94587a | 65 | **/\r |
2f88bd3a | 66 | CHAR16 *\r |
ab94587a | 67 | EFIAPI\r |
2f88bd3a MK |
68 | PathCleanUpDirectories (\r |
69 | IN CHAR16 *Path\r | |
70 | )\r | |
ab94587a | 71 | {\r |
72 | CHAR16 *TempString;\r | |
ae591c14 | 73 | \r |
bb99e328 RN |
74 | if (Path == NULL) {\r |
75 | return NULL;\r | |
ab94587a | 76 | }\r |
bb99e328 | 77 | \r |
ab94587a | 78 | //\r |
bb99e328 | 79 | // Replace the '/' with '\'\r |
ab94587a | 80 | //\r |
bb99e328 | 81 | for (TempString = Path; *TempString != CHAR_NULL; TempString++) {\r |
ab94587a | 82 | if (*TempString == L'/') {\r |
83 | *TempString = L'\\';\r | |
84 | }\r | |
85 | }\r | |
bb99e328 | 86 | \r |
b08b045c JD |
87 | //\r |
88 | // Replace the "\\" with "\"\r | |
89 | //\r | |
90 | while ((TempString = StrStr (Path, L"\\\\")) != NULL) {\r | |
91 | CopyMem (TempString, TempString + 1, StrSize (TempString + 1));\r | |
92 | }\r | |
93 | \r | |
ab94587a | 94 | //\r |
bb99e328 | 95 | // Remove all the "\.". E.g.: fs0:\abc\.\def\.\r |
ab94587a | 96 | //\r |
bb99e328 RN |
97 | while ((TempString = StrStr (Path, L"\\.\\")) != NULL) {\r |
98 | CopyMem (TempString, TempString + 2, StrSize (TempString + 2));\r | |
ab94587a | 99 | }\r |
2f88bd3a | 100 | \r |
9fdf3178 | 101 | if ((StrLen (Path) >= 2) && (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0)) {\r |
bb99e328 | 102 | Path[StrLen (Path) - 1] = CHAR_NULL;\r |
ab94587a | 103 | }\r |
bb99e328 | 104 | \r |
ab94587a | 105 | //\r |
bb99e328 | 106 | // Remove all the "\..". E.g.: fs0:\abc\..\def\..\r |
ab94587a | 107 | //\r |
2f88bd3a | 108 | while (((TempString = StrStr (Path, L"\\..")) != NULL) &&\r |
bb99e328 | 109 | ((*(TempString + 3) == L'\\') || (*(TempString + 3) == CHAR_NULL))\r |
2f88bd3a MK |
110 | )\r |
111 | {\r | |
1fc3749d | 112 | *(TempString + 1) = CHAR_NULL;\r |
2f88bd3a | 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 |