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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 - 2014, 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.
13 #include <LibConfig.h>
14 #include <Library/BaseLib.h>
15 #include <Library/MemoryAllocationLib.h>
18 /** The realpath() function shall derive, from the pathname pointed to by
19 file_name, an absolute pathname that names the same file, whose resolution
20 does not involve '.', '..', or symbolic links.
22 The generated pathname shall be stored as a null-terminated string, up to a
23 maximum of {PATH_MAX} bytes, in the buffer pointed to by resolved_name.
25 If resolved_name is a null pointer, the behavior of realpath() is
26 implementation-defined.
28 @param[in] file_name The filename to convert.
29 @param[in,out] resolved_name The resultant name.
31 @retval NULL An error occured.
32 @return resolved_name.
41 if (file_name
== NULL
|| resolved_name
== NULL
) {
45 Temp
= AllocateZeroPool((1+AsciiStrLen(file_name
))*sizeof(CHAR16
));
50 AsciiStrToUnicodeStr(file_name
, Temp
);
51 PathCleanUpDirectories(Temp
);
52 UnicodeStrToAsciiStr(Temp
, resolved_name
);
53 return (resolved_name
);