hpux man page for xdefaultstring

XDefaultString()														  XDefaultString()

Name
  XDefaultString - return the default string used for text conversion.

Synopsis
  char *XDefaultString( )

Returns
  The string used for unconvertible characters.

Availability
  Release 5 and later.

Description
  XDefaultString()  returns  the  default string used by Xlib for text conversion (for example, in XmbTextListToTextProperty()).  The default
  string is the string in the current locale which is output when an unconvertible character is found during text conversion.  If the  string
  returned  by	XDefaultString()  is  the  empty string (""), no character is output in the converted text.  XDefaultString() does not return
  NULL.

  The string returned by XDefaultString() is independent of the default string for text drawing; see XCreateFontSet() to obtain  the  default
  string for an XFontSet.

  The  returned string is NULL-terminated.  It is owned by Xlib and should not be modified or freed by the client.  It may be freed after the
  current locale is changed.  Until freed, it will not be modified by Xlib.

See Also
  XmbTextListToTextProperty(), XwcTextListToTextProperty(), XmbTextPropertyToTextList(), XwcTextPropertyToTextList(), XwcFreeStringList().

Xlib - Text Conversion														  XDefaultString()