XmStringByteStreamLength — A function that returns the size of a string "XmStringByteStreamLength"

XmStringByteStreamLength  receives  a  byte  stream format string and returns the size, in bytes, of that
       stream, including the header.  Because of  this  header  information,  even  a  NULL  string  will  cause
       XmStringByteStreamLength to return a non-zero value.

       string    Specifies the byte stream format string.

XmStringByteStreamLength — A function that returns the size of a string "XmStringByteStreamLength"

       Returns the size of string, including the header.

                                                                                     XmStringByteStreamLength(3)

       #include <Xm/Xm.h>
       unsigned int XmStringByteStreamLength (string)
               unsigned char   *string;
       (void)