new file mode 100644
--- /dev/null
+++ b/packages/language/c/libc/current/src/stdio/common/vsnprintf.cxx
@@ -0,0 +1,128 @@
+//===========================================================================
+//
+//      vsnprintf.cxx
+//
+//      ANSI Stdio vsnprintf() function
+//
+//===========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//===========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   jlarmour
+// Contributors:  jlarmour@cygnus.co.uk
+// Date:        1998-02-13
+// Purpose:     
+// Description: 
+// Usage:       
+//
+//####DESCRIPTIONEND####
+//
+//===========================================================================
+
+// CONFIGURATION
+
+#include <pkgconf/libc.h>   // Configuration header
+
+// Include the C library? And do we want the stdio stuff?
+#if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO)
+
+// INCLUDES
+
+#include <cyg/infra/cyg_type.h>     // Common project-wide type definitions
+#include <stddef.h>                 // NULL and size_t from compiler
+#include <stdio.h>                  // header for this file
+#include <errno.h>                  // error codes
+#include <cyg/devs/common/table.h>  // Device table stuff
+#include <cyg/devs/common/iorb.h>   // IORBs
+#include "clibincl/stdiosupp.hxx"   // Support functions for stdio
+#include "clibincl/stream.hxx"      // Cyg_StdioStream
+
+
+// EXPORTED SYMBOLS
+
+externC int
+vsnprintf( char *, size_t, const char *, va_list ) 
+    CYGPRI_LIBC_WEAK_ALIAS("_vsnprintf");
+
+// FUNCTIONS
+
+
+static Cyg_ErrNo
+str_write( CYG_ADDRWORD cookie, Cyg_IORB *iorb )
+{
+    cyg_uint8 **str_p = (cyg_uint8 **) cookie;
+    cyg_ucount32 i=0;
+
+    // I suspect most strings passed to vsnprintf will be relatively short,
+    // so we just take the simple approach rather than have the overhead
+    // of calling memcpy etc.
+
+    // simply copy string until we run out of user space
+
+    for (i=0; i < iorb->buffer_length; i++, (*str_p)++ )
+    {
+        **str_p = *((char *)iorb->buffer + i);
+    } // for
+
+    iorb->xferred_length = i;
+
+    return ENOERR;
+    
+} // str_write()
+
+
+externC int
+_vsnprintf( char *s, size_t size, const char *format, va_list arg )
+{
+    int rc;
+    // construct a fake device with the address of the string we've
+    // been passed as its private data. This way we can use the data
+    // directly
+    struct Cyg_Device_Table_t strdev = { "strdev",
+                                         (CYG_ADDRWORD) &s,
+                                         NULL,       // open
+                                         NULL,       // read_cancel
+                                         NULL,       // write_cancel
+                                         NULL,       // read_blocking
+                                         &str_write, // write_blocking
+                                         NULL,       // read_asynchronous
+                                         NULL,       // write_asynchronous
+                                         NULL,       // close
+                                         0 };        // ioctl
+    Cyg_StdioStream my_stream( &strdev, Cyg_StdioStream::CYG_STREAM_WRITE,
+                               false, false, _IONBF, 0, NULL );
+    
+    rc = _vfnprintf( (FILE *)&my_stream, size, format, arg );
+
+    // Null-terminate it, but note that s has been changed by str_write(), so
+    // that it now points to the end of the string
+    s[0] = '\0';
+
+    return rc;
+
+} // _vsnprintf()
+
+#endif // if defined(CYGPKG_LIBC) && defined(CYGPKG_LIBC_STDIO)
+
+// EOF vsnprintf.cxx