1 /** @file
2 Defines file-path manipulation functions.
3
4 Copyright (c) 2011 - 2014, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php.
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12 **/
13 #include <Uefi/UefiBaseType.h>
14 #include <Library/BaseMemoryLib.h>
15 #include <Library/BaseLib.h>
16 #include <Protocol/SimpleTextIn.h>
17
18 /**
19 Removes the last directory or file entry in a path by changing the last
20 L'\' to a CHAR_NULL.
21
22 @param[in,out] Path A pointer to the path to modify.
23
24 @retval FALSE Nothing was found to remove.
25 @retval TRUE A directory or file was removed.
26 **/
27 BOOLEAN
28 EFIAPI
PathRemoveLastItem(IN OUT CHAR16 * Path)29 PathRemoveLastItem(
30 IN OUT CHAR16 *Path
31 )
32 {
33 CHAR16 *Walker;
34 CHAR16 *LastSlash;
35 //
36 // get directory name from path... ('chop' off extra)
37 //
38 for ( Walker = Path, LastSlash = NULL
39 ; Walker != NULL && *Walker != CHAR_NULL
40 ; Walker++
41 ){
42 if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) {
43 LastSlash = Walker+1;
44 }
45 }
46 if (LastSlash != NULL) {
47 *LastSlash = CHAR_NULL;
48 return (TRUE);
49 }
50 return (FALSE);
51 }
52
53 /**
54 Function to clean up paths.
55
56 - Single periods in the path are removed.
57 - Double periods in the path are removed along with a single parent directory.
58 - Forward slashes L'/' are converted to backward slashes L'\'.
59
60 This will be done inline and the existing buffer may be larger than required
61 upon completion.
62
63 @param[in] Path The pointer to the string containing the path.
64
65 @return Returns Path, otherwise returns NULL to indicate that an error has occured.
66 **/
67 CHAR16*
68 EFIAPI
PathCleanUpDirectories(IN CHAR16 * Path)69 PathCleanUpDirectories(
70 IN CHAR16 *Path
71 )
72 {
73 CHAR16 *TempString;
74 UINTN TempSize;
75
76 if (Path==NULL) {
77 return(NULL);
78 }
79 //
80 // Fix up the '/' vs '\'
81 //
82 for (TempString = Path ; TempString != NULL && *TempString != CHAR_NULL ; TempString++) {
83 if (*TempString == L'/') {
84 *TempString = L'\\';
85 }
86 }
87 //
88 // Fix up the ..
89 //
90 while ((TempString = StrStr(Path, L"\\..\\")) != NULL) {
91 *TempString = CHAR_NULL;
92 TempString += 4;
93 PathRemoveLastItem(Path);
94 TempSize = StrSize(TempString);
95 CopyMem(Path+StrLen(Path), TempString, TempSize);
96 }
97 if ((TempString = StrStr(Path, L"\\..")) != NULL && *(TempString + 3) == CHAR_NULL) {
98 *TempString = CHAR_NULL;
99 PathRemoveLastItem(Path);
100 }
101 //
102 // Fix up the .
103 //
104 while ((TempString = StrStr(Path, L"\\.\\")) != NULL) {
105 *TempString = CHAR_NULL;
106 TempString += 2;
107 TempSize = StrSize(TempString);
108 CopyMem(Path+StrLen(Path), TempString, TempSize);
109 }
110 if ((TempString = StrStr(Path, L"\\.")) != NULL && *(TempString + 2) == CHAR_NULL) {
111 *(TempString + 1) = CHAR_NULL;
112 }
113
114 while ((TempString = StrStr(Path, L"\\\\")) != NULL) {
115 *TempString = CHAR_NULL;
116 TempString += 1;
117 TempSize = StrSize(TempString);
118 CopyMem(Path+StrLen(Path), TempString, TempSize);
119 }
120 if ((TempString = StrStr(Path, L"\\\\")) != NULL && *(TempString + 1) == CHAR_NULL) {
121 *(TempString) = CHAR_NULL;
122 }
123
124 return (Path);
125 }
126
127