BaseTools/GenFfs: add FFS file types for MM modules.

[mirror_edk2.git] / StdLib / LibC / StdLib / realpath.c

/** @file\r
  Implement the realpath function.\r
\r
  Copyright (c) 2011 - 2014, Intel Corporation\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
**/\r
#include <LibConfig.h>\r
#include <Library/BaseLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <errno.h>\r
\r
/** The realpath() function shall derive, from the pathname pointed to by\r
    file_name, an absolute pathname that names the same file, whose resolution\r
    does not involve '.', '..', or symbolic links.\r
\r
    The generated pathname shall be stored as a null-terminated string, up to a\r
    maximum of {PATH_MAX} bytes, in the buffer pointed to by resolved_name.\r
\r
    If resolved_name is a null pointer, the behavior of realpath() is\r
    implementation-defined.\r
\r
  @param[in] file_name            The filename to convert.\r
  @param[in,out] resolved_name    The resultant name.\r
\r
  @retval NULL                    An error occured.\r
  @return resolved_name.\r
**/\r
char *\r
realpath(\r
  char *file_name,\r
  char *resolved_name\r
  )\r
{\r
  CHAR16 *Temp;\r
  if (file_name == NULL || resolved_name == NULL) {\r
    errno = EINVAL;\r
    return (NULL);\r
  }\r
  Temp = AllocateZeroPool((1+AsciiStrLen(file_name))*sizeof(CHAR16));\r
  if (Temp == NULL) {\r
    errno = ENOMEM;\r
    return (NULL);\r
  }\r
  AsciiStrToUnicodeStr(file_name, Temp);\r
  PathCleanUpDirectories(Temp);\r
  UnicodeStrToAsciiStr(Temp, resolved_name);\r
  return (resolved_name);\r
}\r