Add Socket Libraries.

Add Posix functions for porting compatibility.
Fix compliance issues with ISO/IEC 9899:199409
New Functions:
  setenv(), fparseln(), GetFileNameFromPath(), rename(),
  realpath(), setprogname(), getprogname(), strlcat(), strlcpy(),
  strsep(), setitimer(), getitimer(), timegm(), getopt(), basename(),
  mkstemp(), ffs(), vsnprintf(), snprintf(), getpass(), usleep(), select(),
  writev(), strcasecmp(), getcwd(), chdir(), tcgetpgrp(), getpgrp(), gettimeofday(),
  bcopy(), 


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12061 6f19259b-4bc3-4df7-8a09-765794883524

StdLib/LibC/StdLib/realpath.c

@@ -0,0 +1,57 @@
+/** @file
+  Implement the realpath function.
+
+  Copyright (c) 2011, Intel Corporation
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <LibConfig.h>
+#include <Library/BaseLib.h>
+#include <Library/PathLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <errno.h>
+
+/**
+  The realpath() function shall derive, from the pathname pointed to by 
+  file_name, an absolute pathname that names the same file, whose resolution 
+  does not involve '.', '..', or symbolic links. The generated pathname shall
+  be stored as a null-terminated string, up to a maximum of {PATH_MAX} bytes,
+  in the buffer pointed to by resolved_name.
+
+  If resolved_name is a null pointer, the behavior of realpath() is 
+  implementation-defined.
+
+  @param[in] file_name            The filename to convert.
+  @param[in,out] resolved_name    The resultant name.
+
+  @retval NULL                    An error occured.
+  @return resolved_name.
+**/
+char *
+realpath(
+  char *file_name, 
+  char *resolved_name
+  )
+{
+  CHAR16 *Temp;
+  if (file_name == NULL || resolved_name == NULL) {
+    errno = EINVAL;
+    return (NULL);
+  }
+  Temp = AllocateZeroPool((1+AsciiStrLen(file_name))*sizeof(CHAR16));
+  if (Temp == NULL) {
+    errno = ENOMEM;
+    return (NULL);
+  }
+  AsciiStrToUnicodeStr(file_name, Temp);
+  PathCleanUpDirectories(Temp);
+  UnicodeStrToAsciiStr(Temp, resolved_name);
+  return (resolved_name);
+}