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git.proxmox.com Git - mirror_edk2.git/blob - StdLib/LibC/StdLib/realpath.c
2 Implement the realpath function.
4 Copyright (c) 2011, Intel Corporation
5 All rights reserved. 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
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.
15 #include <LibConfig.h>
16 #include <Library/BaseLib.h>
17 #include <Library/PathLib.h>
18 #include <Library/MemoryAllocationLib.h>
22 The realpath() function shall derive, from the pathname pointed to by
23 file_name, an absolute pathname that names the same file, whose resolution
24 does not involve '.', '..', or symbolic links. The generated pathname shall
25 be stored as a null-terminated string, up to a maximum of {PATH_MAX} bytes,
26 in the buffer pointed to by resolved_name.
28 If resolved_name is a null pointer, the behavior of realpath() is
29 implementation-defined.
31 @param[in] file_name The filename to convert.
32 @param[in,out] resolved_name The resultant name.
34 @retval NULL An error occured.
35 @return resolved_name.
44 if (file_name
== NULL
|| resolved_name
== NULL
) {
48 Temp
= AllocateZeroPool((1+AsciiStrLen(file_name
))*sizeof(CHAR16
));
53 AsciiStrToUnicodeStr(file_name
, Temp
);
54 PathCleanUpDirectories(Temp
);
55 UnicodeStrToAsciiStr(Temp
, resolved_name
);
56 return (resolved_name
);