kernel: Add a wine_get_unix_real_name function to parallel wine_get_unix_file_name

[Jeremy White]

The new function allows a user to get a simplified path, rather than the actual path
(e.g. /var instead of /home/myuser/.wine/dosdevices/z:/var/)
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>From 601dbb383d77d4a3faaf8058b85684118218f19d Mon Sep 17 00:00:00 2001
From: Jeremy White <jwhite at codeweavers.com>
Date: Fri, 27 Oct 2006 10:29:07 -0500
Subject: Add a wine_get_unix_real_name to provide a way for a caller
to get a simplified path.
---
 dlls/kernel/kernel32.spec |    1 +
 dlls/kernel/path.c        |   49 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 0 deletions(-)

diff --git a/dlls/kernel/kernel32.spec b/dlls/kernel/kernel32.spec
index 09cfc8b..4d9eff6 100644
--- a/dlls/kernel/kernel32.spec
+++ b/dlls/kernel/kernel32.spec
@@ -1235,6 +1235,7 @@ # 16-bit relays
 
 # Unix files
 @ cdecl wine_get_unix_file_name(wstr)
+@ cdecl wine_get_unix_real_name(wstr)
 @ cdecl wine_get_dos_file_name(str)
 
 # Init code
diff --git a/dlls/kernel/path.c b/dlls/kernel/path.c
index c4d7677..eb924f3 100644
--- a/dlls/kernel/path.c
+++ b/dlls/kernel/path.c
@@ -27,6 +27,8 @@ #include "wine/port.h"
 #include <errno.h>
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdlib.h>
+#include <limits.h>
 
 #define NONAMELESSUNION
 #define NONAMELESSSTRUCT
@@ -1507,6 +1509,53 @@ char *wine_get_unix_file_name( LPCWSTR d
     return unix_name.Buffer;
 }
 
+/***********************************************************************
+ *           wine_get_unix_real_name (KERNEL32.@) Not a Windows API
+ *
+ * Return the full Unix file name for a given path, passing the result
+ *  through realpath()
+ */
+char *wine_get_unix_real_name( LPCWSTR dosW )
+{
+    UNICODE_STRING nt_name;
+    ANSI_STRING unix_name;
+    NTSTATUS status;
+    int path_max;
+    char *real_unix_name;
+
+    if (!RtlDosPathNameToNtPathName_U( dosW, &nt_name, NULL, NULL )) return NULL;
+    status = wine_nt_to_unix_file_name( &nt_name, &unix_name, FILE_OPEN_IF, FALSE );
+    RtlFreeUnicodeString( &nt_name );
+    if (status && status != STATUS_NO_SUCH_FILE)
+    {
+        SetLastError( RtlNtStatusToDosError( status ) );
+        return NULL;
+    }
+
+    #if defined(PATH_MAX)
+        path_max = PATH_MAX;
+    #else
+        path_max = pathconf(unix_name.Buffer, _PC_PATH_MAX);
+        if (path_max <= 0)
+            path_max = 4096;
+    #endif
+
+    if (!(real_unix_name = RtlAllocateHeap( GetProcessHeap(), 0, path_max )))
+    {
+        RtlFreeAnsiString ( &unix_name );
+        SetLastError( ERROR_NOT_ENOUGH_MEMORY );
+        return NULL;
+    }
+
+    if (realpath(unix_name.Buffer, real_unix_name))
+    {
+        RtlFreeAnsiString ( &unix_name );
+        return real_unix_name;
+    }
+
+    return unix_name.Buffer;
+}
+
 
 /***********************************************************************
  *           wine_get_dos_file_name (KERNEL32.@) Not a Windows API
-- 
1.4.3.2