[Bug 4335] New: _tempnam does not check for the environment variable TMP

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=4335

           Summary: _tempnam does not check for the environment variable TMP
           Product: Wine
           Version: 0.9.5.
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: wine-files
        AssignedTo: wine-bugs(a)winehq.org
        ReportedBy: sascha93101(a)yahoo.com


_tempnam should follow the rules described here:
http://msdn2.microsoft.com/en-us/library/hs3e7355.aspx

When the Microsoft linker links an executable using a resource file, it calls 
_tempnam to get a name for a temporary files. Since TMP is ignored, the linker 
gets back the name "/lnk**.tmp". In most cases, the user running linker doesn't 
and shouldn't have write permissions in the root directory, and the linker 
fails.

The fixed code is here:
char *_tempnam(const char *dir, const char *prefix)
{
  char tmpbuf[MAX_PATH];
  char save_TMP[MAX_PATH];
  const char *tmp_dir = dir;
  
  if (GetEnvironmentVariableA("TMP",save_TMP,sizeof(save_TMP)))
  {
    tmp_dir = save_TMP;
  }

  TRACE("dir (%s) prefix (%s)\n",tmp_dir,prefix);
  if (GetTempFileNameA(tmp_dir,prefix,0,tmpbuf))
  {
    TRACE("got name (%s)\n",tmpbuf);
    DeleteFileA(tmpbuf);
    return _strdup(tmpbuf);
  }
  TRACE("failed (%ld)\n",GetLastError());
  return NULL;
}

I'll send it to wine-patches(a)winehq.org too.
Also, http://bugs.winehq.org/show_bug.cgi?id=1652 could be another 
manifestation of this bug.

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