XmStringIsVoid — A compound string function that provides information on the existence of non-zero-length

XmStringIsVoid returns a Boolean value indicating whether or not string s1 is void.

       s1        Specifies the compound string

XmStringIsVoid — A compound string function that provides information on the existence of non-zero-length
       text  components,  tab  components,  or separator components "XmStringIsVoid" "compound string functions"
       "XmStringIsVoid"

XmStringCreate(3).

                                                                                               XmStringIsVoid(3)

       Returns True if any non-zero-length text components, tab components, or separator components exist in s1.
       That is, the function returns True if the string has no text, tabs, or separators.  If  s1  contains  the
       NULL string, the function returns True.

       #include <Xm/Xm.h>
       BooleanXmStringIsVoid(
       XmStrings1);